JP7552016B2 - Eyeglass lens measuring device - Google Patents

Description

This disclosure relates to an eyeglass lens measuring device that measures the optical characteristics of eyeglass lenses.

A spectacle lens measuring device is known that includes an optical system for measuring the optical characteristics of a spectacle lens and an optical system for detecting lens information (hidden marks) of the spectacle lens (see, for example, Patent Document 1).

JP 2018-54454 A

However, in Patent Document 1, an optical system for obtaining the optical characteristics of the eyeglass lens and an optical system for obtaining lens information of the eyeglass lens are separately provided, which creates the problem of a complicated device configuration. In addition, aligning the eyeglass lens with each optical system is time-consuming, and it is not easy to obtain the optical characteristics and lens information of the eyeglass lens.

In view of the above-mentioned conventional techniques, the technical objective of the present disclosure is to provide a spectacle lens measurement device that can obtain the optical characteristics and lens information of a spectacle lens with a simple configuration and with high accuracy.

In order to solve the above problems, the present disclosure is characterized by having the following configuration:

(1) A spectacle lens measurement device according to a first aspect of the present disclosure is a spectacle lens measurement device for measuring a spectacle lens, comprising: a light source that irradiates a measurement light beam toward the spectacle lens; a transmissive display that transmits the measurement light beam from the light source, the transmissive display being capable of displaying an index pattern formed by arranging a plurality of indexes; a display control means that controls the display of the index pattern; a detector that detects the measurement light beam that has passed through the spectacle lens and the transmissive display; an optical characteristic acquisition means that acquires optical characteristics of the spectacle lens based on a detection result of the detector; and a lens information acquisition means that acquires lens information different from the optical characteristics of the spectacle lens based on the detection result of the detector. and a measurement information acquisition means, wherein the transmissive display has a first transmissive display capable of displaying a first index pattern, and a second transmissive display capable of displaying a second index pattern, the second transmissive display being disposed at a position different from the first transmissive display in the optical axis direction, the detector detects the measurement light beam that has transmitted through the first transmissive display and further transmitted through the second transmissive display, the display control means displays the index pattern, thereby causing the optical characteristic acquisition means to acquire the optical characteristics, and the display control means hides at least a portion of the index pattern, thereby causing the lens information acquisition means to acquire the lens information.

FIG. FIG. 2 is a schematic diagram of a glasses supporting unit and a lens measuring unit. 1 is an example of an index pattern that can be displayed on a transmissive display. 13 is an example of a captured image obtained by displaying a first index pattern on a first transmissive display. 13 is an example of a captured image obtained by displaying a second index pattern on a second transmissive display. FIG. 2 is a diagram showing a control system of the measuring device. FIG. 2 is a schematic diagram showing a measurement light beam from a light source. FIG. 2 is a diagram showing the meridian direction of a lens. 1 is an example of a measurement image. 1 is an example of a measurement optical system equipped with one transmissive display. This is an example of a configuration in which the optical path along which the measurement light beam is guided to the left lens and the optical path along which the measurement light beam is guided to the right lens are different optical paths. This is an example of a configuration in which a display is used as a light source. 4 is an example of an irradiation pattern that can be displayed on a display.

＜Overview＞
An overview of the eyeglass lens measurement device according to the embodiment of the present disclosure will be described. Note that the items classified in <> below can be used independently or in association with each other.

<Measurement optical system>
The eyeglass lens measuring device in this embodiment includes a measuring optical system (e.g., a measuring optical system 20). The measuring optical system includes a configuration for measuring the optical characteristics of the eyeglass lens. For example, the optical characteristics of the eyeglass lens may be at least one of a spherical power, a cylindrical power, an astigmatism axis angle, a prism amount, and the like. The measuring optical system also includes a configuration for acquiring lens information of the eyeglass lens. For example, the lens information of the eyeglass lens is information different from the optical characteristics. For example, the lens information of the eyeglass lens may be information different from the optical characteristics measured by the measuring optical system. As an example, the lens information of the eyeglass lens may be at least one of information on a hidden mark formed on the eyeglass lens, information on a marking mark affixed to the eyeglass lens, information on a print mark affixed to the eyeglass lens, information on an outer shape of the eyeglass lens, and the like. For example, the measuring optical system may share at least a part of the configuration for measuring the optical characteristics of the eyeglass lens and the configuration for acquiring the lens information of the eyeglass lens.

The measurement optical system may include at least a light source, a transmissive display, and a detector. For example, the measurement optical system may be configured to project a measurement light beam from the light source toward the eyeglass lens, and detect the measurement light beam that passes through the eyeglass lens and the transmissive display with a detector, thereby measuring the optical characteristics of the eyeglass lens. The measurement optical system may include a retroreflective member that can reflect the measurement light beam from the light source back in the incident direction and illuminate the eyeglass lens. The measurement optical system may also include an optical member (e.g., a collimator lens 23) for shaping the measurement light beam from the light source. The measurement optical system may also include an optical path branching member (e.g., a half mirror 22) for branching the measurement light beam from the light source into multiple optical paths.

<Light source>
The eyeglass lens measurement device in this embodiment includes a light source (e.g., light source 21). The light source irradiates a measurement light beam toward the eyeglass lens. The light source may be disposed at any position. The light source may be a point light source. In this case, for example, an LED (Light Emitting Diode) or the like may be used as the point light source. The light source may also be a surface light source. In this case, for example, a light emitting panel or the like may be used as the surface light source.

The light source may be a display capable of irradiating the measurement light beam toward the eyeglass lens and illuminating the eyeglass lens. In this case, for example, at least one of a liquid crystal display, an organic electroluminescence display, a plasma display, etc. may be used as the light source. The display can project an irradiation pattern onto the eyeglass lens by displaying an irradiation pattern different from an index pattern formed by arranging multiple indexes, which will be described later. In addition, the display can obtain an eyeglass lens image, an index pattern image (index image) projected onto the eyeglass lens, an irradiation pattern image projected onto the eyeglass lens, etc., with high contrast by illuminating the eyeglass lens, thereby improving the detection accuracy of these images.

The light source may include a first light source and a second light source. For example, the first light source may be a light source for a left lens that irradiates a measurement light beam toward the left lens of the eyeglass lens. Also, for example, the second light source may be a light source for a right lens that irradiates a measurement light beam toward the right lens of the eyeglass lens.

The first light source and the second light source may be used together. That is, the first light source (second light source) may irradiate the measurement light beam toward the left lens of the eyeglass lens and the right lens of the eyeglass lens. For example, the first light source (second light source) may irradiate the measurement light beam toward the left lens and the right lens in order. In this case, a change means (e.g., a motor, etc.) for changing the relative positional relationship between the first light source (second light source) and the eyeglass lens may be provided. Also, for example, the first light source (second light source) may irradiate the measurement light beam toward both the left lens and the right lens. As an example, the measurement light beam may be irradiated toward both the left lens and the right lens by arranging both the left lens and the right lens in the optical path where the measurement light beam is irradiated from the first light source (second light source). This allows the optical characteristics of the left lens and the right lens to be obtained simultaneously. Also, this allows lens information to be obtained simultaneously for the left lens and the right lens.

The first light source and the second light source may be provided in a pair on the left and right sides. That is, the first light source may irradiate the measurement light beam toward the left lens of the eyeglass lens, and the second light source may irradiate the measurement light beam toward the right lens of the eyeglass lens. In this case, at least a part of the first optical path along which the measurement light beam is guided from the first light source toward the left lens and the second optical path along which the measurement light beam is guided from the second light source toward the right lens may be a common optical path. In this case, the first optical path along which the measurement light beam is guided from the first light source toward the left lens and the second optical path along which the measurement light beam is guided from the second light source toward the right lens may be different optical paths.

For example, the first light source and the second light source may be turned on at different times, and the measurement light beam may be irradiated to the left lens and the right lens in turn. Also, for example, the first light source and the second light source may be turned on at the same (almost the same) timing, and the measurement light beam may be irradiated to both the left lens and the right lens. In other words, the measurement light beam may be irradiated to the left lens and the right lens simultaneously (almost simultaneously).

<Transmissive display>
The eyeglass lens measurement device in this embodiment includes a transmissive display (e.g., a transmissive display 24). The transmissive display transmits a measurement light beam from a light source. The transmissive display is also capable of displaying an index pattern (e.g., an index pattern 30) formed by arranging a plurality of indices (e.g., an index 31).

In a transmissive display, an index pattern formed by arranging multiple indices is used to measure the optical characteristics of a spectacle lens. The multiple indices are formed in any shape, any position, any number, etc., thereby expressing the index pattern. As an example, the multiple indices may have at least one of the shapes of dots (e.g., circular dots, square dots, etc.), lines (e.g., solid lines, dotted lines, dashed lines, etc.), etc. Also, as an example, the multiple indices may be arranged in at least one of a grid pattern, a radial pattern, a concentric circle pattern, etc.

When measuring the optical characteristics of a spectacle lens, position information indicating the passing position of the measurement light beam from the light source through the transmissive display may be obtained by using an index pattern. For this reason, it is preferable that the multiple indexes are displayed so that the position information of the passing position of the measurement light beam from the light source through the transmissive display can be grasped.

The transmissive display may have a first transmissive display and a second transmissive display. For example, the first transmissive display may be a left lens transmissive display that projects an index pattern image onto the left lens of the eyeglass lens. Also, for example, the second transmissive display may be a right lens transmissive display that projects an index pattern image onto the right lens of the eyeglass lens.

The first transmissive display and the second transmissive display may be shared. That is, the first transmissive display (second transmissive display) may project an index pattern image onto the left lens of the eyeglass lens and the right lens of the eyeglass lens. For example, the first transmissive display (second transmissive display) may display an index pattern, thereby projecting the index pattern image onto both the left lens and the right lens. This allows the index pattern to be projected onto the left lens and the right lens simultaneously.

Also, for example, the first transmissive display (second transmissive display) may project an index pattern image onto the left lens and then onto the right lens. In this case, the first transmissive display (second transmissive display) may have a first region that projects an index pattern image onto the left lens, and a second region that projects an index pattern image onto the right lens. The first transmissive display (second transmissive display) may project an index pattern image onto the left lens and then onto the right lens by displaying an index pattern in each region at different times.

The first transmissive display and the second transmissive display may be provided as a pair on the left and right. That is, the first transmissive display may project an index pattern image onto the left lens of the eyeglass lens, and the second transmissive display may project an index pattern image onto the right lens of the eyeglass lens. For example, the first transmissive display and the second transmissive display may display an index pattern at the same (almost the same) timing, thereby projecting an index pattern image onto both the left lens and the right lens. That is, the index pattern image may be projected onto the left lens and the right lens simultaneously (almost simultaneously). Also, for example, the first transmissive display and the second transmissive display may display an index pattern at different timing, thereby projecting an index pattern image onto the left lens and the right lens in turn.

For example, by displaying an index pattern on a transmissive display, position information of the passing positions of the measurement light beam from the light source passing through at least two points in the optical axis direction is obtained, and the optical characteristics of the eyeglass lens are measured based on this. As an example, the optical characteristics of the eyeglass lens may be measured using position information indicating the passing positions of the measurement light beam from the light source passing through the eyeglass lens and position information indicating the passing positions of the measurement light beam from the light source passing through the transmissive display. More specifically, the optical characteristics of the left lens may be measured using position information indicating the passing positions of the measurement light beam from the light source passing through the left lens of the eyeglass lens and position information indicating the passing positions of the measurement light beam from the light source passing through the first transmissive display. In addition, the optical characteristics of the right lens may be measured using position information indicating the passing positions of the measurement light beam from the light source passing through the right lens of the eyeglass lens and position information indicating the passing positions of the measurement light beam from the light source passing through the second transmissive display.

Also, as an example, the optical characteristics of the eyeglass lenses may be measured using only the position information indicating the passing position of the measurement light beam from the light source through the transmissive display. More specifically, the optical characteristics of the left lens may be measured using only the position information indicating the passing position of the measurement light beam from the light source through the first transmissive display. Also, the optical characteristics of the right lens may be measured using only the position information indicating the passing position of the measurement light beam from the light source through the second transmissive display. In such a case, a change means (e.g., a moving mechanism 28) may be provided to change the relative positional relationship between the first transmissive display and the left lens. In such a case, a change means (e.g., a moving mechanism 28) may be provided to change the relative positional relationship between the second transmissive display and the right lens.

The first transmissive display may have a transmissive display capable of displaying the first index pattern and a transmissive display capable of displaying the second index pattern. That is, the transmissive display capable of displaying the first index pattern may project a first index pattern image onto the left lens of the eyeglass lens, and the transmissive display capable of displaying the second index pattern may project a second index pattern image onto the left lens of the eyeglass lens. The transmissive display capable of displaying the first index pattern and the transmissive display capable of displaying the second index pattern are disposed at different positions in the optical axis direction. Note that the first index pattern and the second index pattern may be the same index pattern. Of course, the first index pattern and the second index pattern may be index patterns that are at least partially different.

The second transmissive display may have a transmissive display capable of displaying the first index pattern and a transmissive display capable of displaying the second index pattern. That is, the transmissive display capable of displaying the first index pattern may project a first index pattern image onto the right lens of the eyeglass lens, and the transmissive display capable of displaying the second index pattern may project a second index pattern image onto the right lens of the eyeglass lens. The transmissive display capable of displaying the first index pattern and the transmissive display capable of displaying the second index pattern are disposed at different positions in the optical axis direction. Note that the first index pattern and the second index pattern may be the same index pattern. Of course, the first index pattern and the second index pattern may be index patterns that are at least partially different.

For example, by displaying index patterns on each of a transmissive display capable of displaying a first index pattern and a transmissive display capable of displaying a second index pattern, position information of the passing positions where the measurement light beam from the light source passes through at least two points in the optical axis direction is obtained, and based on this, the refraction angle of the measurement light beam is obtained, and the optical characteristics of the eyeglass lens are measured. More specifically, in the first transmissive display, the optical characteristics of the left lens of the eyeglass lens may be measured using position information indicating the passing positions where the measurement light beam from the light source passes through the transmissive display capable of displaying the first index pattern and position information indicating the passing positions where the measurement light beam from the light source passes through the transmissive display capable of displaying the second index pattern. In addition, in the second transmissive display, the optical characteristics of the right lens of the eyeglass lens may be measured using position information indicating the passing positions where the measurement light beam from the light source passes through the transmissive display capable of displaying the first index pattern and position information indicating the passing positions where the measurement light beam from the light source passes through the transmissive display capable of displaying the second index pattern.

For example, by providing a transmissive display capable of displaying a first index pattern and a transmissive display capable of displaying a second index pattern at different positions in the optical axis direction, position information can be obtained for the passing positions at which the measurement light beam from the light source passes through at least two points in the optical axis direction, regardless of the position at which the measurement light beam from the light source passes through the eyeglass lens, thereby measuring the optical characteristics of the eyeglass lens. The optical characteristics of the eyeglass lens can be obtained with high accuracy with a simple configuration without providing a means for changing the relative positional relationship between the eyeglass lens and the transmissive display.

<Detector>
The eyeglass lens measurement device in this embodiment includes a detector (e.g., an image sensor 27). The detector detects a measurement light beam that has passed through the eyeglass lens and the transmissive display. For example, the detector may detect a measurement light beam that has passed through the eyeglass lens and the first transmissive display, and a measurement light beam that has passed through the eyeglass lens and the second transmissive display. Furthermore, for example, the detector may detect a reflected light beam that is a measurement light beam irradiated from a light source and reflected by a retroreflective member described below. Furthermore, for example, the detector may detect a measurement light beam from a display used as a light source.

The detector may be disposed at any position on the eyeglass lens. The detector may detect the measurement light beam based on a signal (signal data). The detector may also detect the measurement light beam based on an image (image data) obtained by converting the signal (signal data).

The detector may include a first detector and a second detector. For example, the first detector may be a left lens detector that detects the measurement light beam that has passed through the left lens of the eyeglass lens and the transmissive display. Also, for example, the second detector may be a right lens detector that detects the measurement light beam that has passed through the right lens of the eyeglass lens and the transmissive display.

The first detector and the second detector may be used together. That is, the first detector (second detector) may detect the measurement light beam that has passed through the left lens of the eyeglass lens and the transmissive display, and the measurement light beam that has passed through the right lens of the eyeglass lens and the transmissive display. For example, the first detector (second detector) may detect the measurement light beam that has passed through the left lens and the transmissive display, and the measurement light beam that has passed through the right lens and the transmissive display, in that order. In this case, a change means (e.g., a motor, etc.) that changes the relative positional relationship between the first detector (second detector) and the eyeglass lens may be provided. Also, for example, the first detector (second detector) may detect both the measurement light beam that has passed through the left lens and the transmissive display, and the measurement light beam that has passed through the right lens and the transmissive display. This allows the optical characteristics of the left lens and the right lens to be obtained simultaneously. This also allows lens information to be obtained simultaneously for the left lens and the right lens.

The first detector and the second detector may be provided in a pair on the left and right. That is, the first detector may detect the measurement light beam that has passed through the left lens of the eyeglass lens and the transmissive display, and the second detector may detect the measurement light beam that has passed through the right lens of the eyeglass lens and the transmissive display. For example, the first detector and the second detector may detect the measurement light beam that has passed through the left lens and the transmissive display and the measurement light beam that has passed through the right lens and the transmissive display in that order. Also, for example, the first detector and the second detector may detect both the measurement light beam that has passed through the left lens and the transmissive display and the measurement light beam that has passed through the right lens and the transmissive display. That is, the measurement light beam that has passed through the left lens and the transmissive display and the measurement light beam that has passed through the right lens and the transmissive display may be detected simultaneously.

When the first and second detectors are provided as a pair on the left and right, the number of pixels of the detectors can be effectively used for each of the left and right lenses of the eyeglass lens, and the position of the index pattern image (index image) can be detected more accurately, improving the measurement accuracy of the optical characteristics. In addition, since there is no need to distinguish between the measurement light beam that has passed through the left lens and the transmissive display and the measurement light beam that has passed through the right lens and the transmissive display, the optical characteristics and lens information of the eyeglass lens can be obtained by simpler control.

<Retroreflective member>
The eyeglass lens measuring device in this embodiment includes a retroreflective member (e.g., a retroreflective member 25). The retroreflective member reflects the measurement light beam, which is irradiated from the light source toward the eyeglass lens and passes through the eyeglass lens and the transmissive display, back in the incident direction, so that the reflected light beam of the measurement light beam can be irradiated onto the eyeglass lens. That is, the retroreflective member can irradiate the eyeglass lens with the reflected light beam of the measurement light beam by making the incident direction of the measurement light beam from the light source parallel (approximately parallel) to the reflection direction of the measurement light beam from the light source. In other words, the retroreflective member can reflect the measurement light beam from the light source and illuminate the eyeglass lens. This makes it possible to obtain an eyeglass lens image and an index pattern image (index image) projected onto the eyeglass lens with high contrast, and improves the detection accuracy of these images.

For example, the retroreflective member may reflect the measurement light beam from the light source and irradiate the reflected light beam of the measurement light beam on the front surface of the eyeglass lens. As an example, in a configuration in which the light source and the detector are arranged on the rear surface side of the eyeglass lens, the retroreflective member may be arranged on the front surface side of the eyeglass lens to reflect the measurement light beam from the light source and irradiate the reflected light beam of the measurement light beam on the front surface of the eyeglass lens. Also, for example, the retroreflective member may reflect the measurement light beam from the light source and irradiate the reflected light beam of the measurement light beam on the rear surface of the eyeglass lens. As an example, in a configuration in which the light source and the detector are arranged on the front surface side of the eyeglass lens, the retroreflective member may be arranged on the rear surface side of the eyeglass lens to reflect the measurement light beam from the light source and irradiate the reflected light beam of the measurement light beam on the rear surface of the eyeglass lens.

The retroreflective member may have a first retroreflective member and a second retroreflective member. For example, the first retroreflective member may be a left lens retroreflective member that is irradiated from a light source toward the left lens of the eyeglass lens and reflects the measurement light flux that has passed through the left lens and the transmissive display back in the incident direction, thereby irradiating the left lens with a reflected light flux of the measurement light flux. Also, for example, the second retroreflective member may be a right lens retroreflective member that is irradiated from a light source toward the right lens of the eyeglass lens and reflects the measurement light flux that has passed through the right lens and the transmissive display back in the incident direction, thereby irradiating the right lens with a reflected light flux of the measurement light flux.

The first retroreflective member and the second retroreflective member may be used together. That is, the first retroreflective member (second retroreflective member) may reflect the measurement light beam irradiated from the light source toward the left lens of the eyeglass lens back in the incident direction to irradiate the left lens with a reflected light beam of the measurement light beam, and may reflect the measurement light beam irradiated from the light source toward the right lens of the eyeglass lens back in the incident direction to irradiate the right lens with a reflected light beam of the measurement light beam.

The first retroreflective member and the second retroreflective member may be provided in a pair on the left and right. That is, the first retroreflective member may reflect the measurement light beam irradiated from the light source toward the left lens of the eyeglass lens back in the incident direction, thereby irradiating the left lens with a reflected light beam of the measurement light beam, and the second retroreflective member may reflect the measurement light beam irradiated from the light source toward the right lens of the eyeglass lens back in the incident direction, thereby irradiating the right lens with a reflected light beam of the measurement light beam.

If the eyeglass lens can be sufficiently illuminated by reflecting the measurement light beam from the light source, it is not necessary to provide a retroreflective member. Also, if one of the light source and the detector is arranged on the front side of the eyeglass lens and the other of the light source and the detector is arranged on the rear side of the eyeglass lens, it is not necessary to provide a retroreflective member.

<Optical arrangement of the measurement optical system>
In this embodiment, the measurement optical system may include a light source, a detector, a transmissive display, a retroreflective member, etc. In addition, in this embodiment, the measurement optical system may have the light source and the detector disposed on the front side of the eyeglass lens, and the transmissive display and the reflective member disposed on the rear side of the eyeglass lens.

For example, in a measurement optical system, when the first light source and the second light source are used together and the first detector and the second detector are used together, the measurement light beam emitted from the light source is irradiated onto both the left lens and the right lens of the eyeglass lens. The measurement light beam that passes through the left lens and the transmissive display, is reflected by the retroreflective member, and passes again through the transmissive display and the left lens, and the measurement light beam that passes through the right lens and the transmissive display, is reflected by the retroreflective member, and passes again through the transmissive display and the right lens are both detected by the detector.

For example, in a measurement optical system in which a first light source and a second light source are provided as a pair on the left and right, and a first detector and a second detector are provided as a pair on the left and right, a measurement light beam emitted from the first light source passes through the left lens of the eyeglass lens and the transmissive display, is reflected by the retroreflective member, and passes again through the transmissive display and the left lens to be detected by the first detector. Also, a measurement light beam emitted from the second light source passes through the right lens of the eyeglass lens and the transmissive display, is reflected by the retroreflective member, and passes again through the transmissive display and the right lens to be detected by the second detector.

For example, in a measurement optical system, when the first light source and the second light source are used together and the first and second detectors are provided as a pair on the left and right, the measurement light beam emitted from the light source is irradiated onto both the left and right lenses of the eyeglass lenses. The measurement light beam passes through the left lens and the transmissive display, is reflected by the retroreflective member, and passes again through the transmissive display and left lens, and is detected by the first detector, while the measurement light beam passes through the right lens and the transmissive display, is reflected by the retroreflective member, and passes again through the transmissive display and right lens, and is detected by the second detector.

For example, in a measurement optical system in which a first light source and a second light source are provided as a pair on the left and right sides and a first detector and a second detector are used in common, the measurement light beam irradiated from the first light source is irradiated onto the left lens of the eyeglass lens, and the measurement light beam irradiated from the second light source is irradiated onto the right lens of the eyeglass lens. The measurement light beam that passes through the left lens and the transmissive display and is reflected by the retroreflective member, then passes again through the transmissive display and left lens, and the measurement light beam that passes through the right lens and the transmissive display and is reflected by the retroreflective member, then passes again through the transmissive display and right lens are both detected by the detector.

In any of the above configurations, the first transmissive display and the second transmissive display may be used together in the measurement optical system, or may be provided as a pair on the left and right. The first transmissive display may have a transmissive display capable of displaying the first index pattern and a transmissive display capable of displaying the second index pattern, which are arranged at different positions in the optical axis direction. The second transmissive display may have a transmissive display capable of displaying the first index pattern and a transmissive display capable of displaying the second index pattern, which are arranged at different positions in the optical axis direction. In any of the above configurations, the first retroreflective member and the second retroreflective member may be used together in the measurement optical system, or may be provided as a pair on the left and right.

In addition, in this embodiment, the measurement optical system may include a display as a light source, a detector, a transmissive display, etc. Also, in this embodiment, the measurement optical system may have a detector disposed on the front side of the eyeglass lens, and a display and a transmissive display disposed on the rear side of the eyeglass lens.

For example, in a measurement optical system, when the first display and the second display are used together and the first detector and the second detector are used together, the measurement light beam emitted from the display is irradiated onto both the left lens and the right lens of the eyeglass lens. The measurement light beam that passes through the left lens and the transmissive display and the measurement light beam that passes through the right lens and the transmissive display are both detected by the detector.

For example, in a measurement optical system in which a first display and a second display are provided as a left-right pair and a first detector and a second detector are provided as a left-right pair, the measurement light beam irradiated from the first display passes through the left lens of the eyeglass lens and the transmissive display and is detected by the first detector. Also, the measurement light beam irradiated from the second display passes through the right lens of the eyeglass lens and the transmissive display and is detected by the second detector.

For example, in a measurement optical system, when the first display and the second display are used together and the first detector and the second detector are provided as a pair on the left and right, the measurement light beam emitted from the display is irradiated onto both the left and right lenses of the eyeglass lenses. The measurement light beam that passes through the left lens and the transmissive display is detected by the first detector, and the measurement light beam that passes through the right lens and the transmissive display is detected by the second detector.

For example, in a measurement optical system, when a first display and a second display are provided as a pair on the left and right sides and the first detector and the second detector are used together, the measurement light beam irradiated from the first display is irradiated onto the left lens of the eyeglass lens, and the measurement light beam irradiated from the second display is irradiated onto the right lens of the eyeglass lens. The measurement light beam that has passed through the left lens and the transmissive display, and the measurement light beam that has passed through the right lens and the transmissive display are both detected by the detector.

In any of the above configurations, in the measurement optical system, the first transmissive display and the second transmissive display may be shared, or may be provided as a pair on the left and right. The first transmissive display may have a transmissive display capable of displaying the first index pattern and a transmissive display capable of displaying the second index pattern, which are arranged at different positions in the optical axis direction. The second transmissive display may have a transmissive display capable of displaying the first index pattern and a transmissive display capable of displaying the second index pattern, which are arranged at different positions in the optical axis direction.

<Index Pattern Image Detection Means>
The spectacle lens measurement device in this embodiment includes an index pattern image detection means (e.g., a control unit 70). The index pattern image detection means detects an image of an index pattern (index pattern image) projected onto the spectacle lens based on a detection result of the detector. For example, the index pattern image detection means may detect an index pattern image based on a signal (signal data) detected by the detector. As an example, the index pattern image detection means may detect an index pattern image based on the intensity of a signal detected by the detector. Also, for example, the index pattern image detection means may detect an index pattern image based on an image (image data) obtained by converting a signal detected by the detector. As an example, the index pattern image detection means may acquire an index pattern image based on at least one of luminance information, saturation information, hue information, etc. of an image.

For example, the index pattern image detection means may detect the spacing between the multiple index images that make up the index pattern image based on the detection results of the detector. In this case, the spacing between the multiple index images may be detected using pixel position information of the multiple index images. Also, for example, the index pattern image detection means may detect the shape of the index images that make up the index pattern image based on the detection results of the detector. In this case, the shape of the index images may be detected by image processing (for example, binarization processing, contour extraction, edge detection, etc.). Also, in this case, the area of the index images may be detected based on the shape of the index images.

<Determination Means>
The eyeglass lens measurement device in this embodiment includes a determination means (e.g., a control unit 70). The determination means determines whether the eyeglass lens is a minus lens or a plus lens based on the detection result of the detector. For example, the determination means may determine whether the eyeglass lens is a minus lens or a plus lens based on a change in pixel position information of an index image constituting an index pattern image obtained as a detection result of the detector. As an example, the determination means may determine that the eyeglass lens is a minus lens when the pixel positions of the index images approach each other (in other words, when the interval between the index images becomes narrow). Also, as another example, the determination means may determine that the eyeglass lens is a plus lens when the pixel positions of the index images move away from each other (in other words, when the interval between the index images becomes wide).

For example, the determination means may determine whether the eyeglass lens is a strong minus lens or a strong plus lens. In this case, the determination means may determine whether the eyeglass lens is a strong minus lens or a strong plus lens based on the degree of change in pixel position information of the index image obtained as a detection result of the detector. For example, the degree of change in pixel position information of the index image may be expressed by at least one of the rate of change (magnification rate or reduction rate) of the pixel position information of the index image, the amount of change (magnification amount or reduction amount) of the pixel position information of the index image, etc.

<Interval Setting Means>
The eyeglass lens measurement device in this embodiment includes an interval setting means (e.g., a control unit 70). The interval setting means can set the interval between the multiple indices that make up the index pattern on the transmissive display. For example, the interval setting means can set the interval between the multiple indices that make up the index pattern on the transmissive display to an arbitrary interval. Also, for example, the interval setting means can set the interval between the multiple indices that make up the index pattern on the transmissive display to a predetermined interval. This makes it possible to obtain an appropriate index pattern image according to the eyeglass lens and to obtain the optical characteristics with high accuracy. Also, even when measuring the optical characteristics of a wide range of eyeglass lenses or obtaining the distribution of the optical characteristics of the eyeglass lenses, the optical characteristics can be obtained with high accuracy.

For example, the interval setting means sets the intervals between the multiple indexes based on an instruction signal for setting the intervals between the multiple indexes. As one example, the interval setting means may set the intervals between the multiple indexes based on an instruction signal input by an operator operating an operation means (e.g., the monitor 4). As another example, the interval setting means may set the intervals between the multiple indexes based on an instruction signal output based on the detection result of the detector.

In this case, the interval setting means may set the intervals between the multiple indices using a table or the like that associates the detection results detected by the detector with the intervals between the multiple indices displayed on the transmissive display. In other words, the interval setting means may set the intervals between the multiple indices to different intervals depending on the detection results detected by the detector. For example, the table may be set in advance based on the results of experiments, simulations, etc.

In this case, the interval setting means may set the interval between the multiple indicators based on whether the detection result detected by the detector exceeds a predetermined threshold. That is, the interval setting means may set the interval between the multiple indicators to different intervals when the detection result detected by the detector exceeds the predetermined threshold and when it is below the predetermined threshold. The predetermined threshold may be set as an acceptable range. In this case, the interval setting means may set the interval between the multiple indicators to different intervals when the detection result detected by the detector is outside the acceptable range and when it is within the acceptable range. For example, the predetermined threshold may be set in advance based on the results of experiments, simulations, etc.

This allows the spacing between the multiple indices to be automatically switched according to the eyeglass lens, making it easy to obtain an appropriate index pattern image according to the eyeglass lens, and enabling the optical characteristics of the eyeglass lens to be obtained with high accuracy. Note that setting the spacing between the multiple indices in this manner can be particularly effectively used in fully automated devices that automatically perform the measurement of optical characteristics from start to finish after the eyeglass lens is placed.

The interval setting means may set the interval between the multiple indices displayed on the transmissive display based on the detection result of the index pattern image detection means. This allows the interval between the multiple indices to be set automatically, making it easy to obtain an appropriate index pattern image for the eyeglass lens.

For example, the interval setting means may set the interval between the multiple indices displayed on the transmissive display based on the interval between the multiple index images constituting the index pattern detected by the index pattern image detection means. In this case, the interval between the indices may be set using a table or the like that associates the interval between the multiple index images constituting the index pattern detected by the index pattern image detection means with the interval between the multiple indices displayed on the transmissive display. In this case, the interval between the multiple indexes may be set depending on whether the interval between the multiple index images constituting the index pattern detected by the index pattern image detection means exceeds a predetermined threshold. For example, the predetermined threshold may be set in the direction in which the interval between the index images narrows. Also, for example, the predetermined threshold may be set in the direction in which the interval between the index images widens. Of course, the predetermined threshold may be set as an allowable range in the direction in which the interval between the index images narrows and the direction in which the interval between the index images widens.

For example, the interval setting means may set the interval between the indices based on the shape of the multiple index images constituting the index pattern detected by the index pattern image detection means. In this case, the interval between the multiple indexes may be set depending on whether the shape of the multiple index images detected by the index pattern image detection means has been deformed relative to the shape of the multiple indexes displayed on the transmissive display. In this case, the interval between the multiple indexes may be set depending on whether the degree of deformation (e.g., deformation rate, deformation amount, etc.) of the multiple index images detected by the index pattern image detection means exceeds a predetermined threshold. For example, the deformation of the multiple index images may be at least one of enlargement, reduction, distortion, chipping, etc.

For example, the interval setting means may set the interval between the multiple indices based on the area of the multiple index images constituting the index pattern detected by the index pattern image detection means. In this case, the interval between the multiple indices may be set depending on whether the area of the multiple index images detected by the index pattern image detection means has increased or decreased relative to the area of the multiple indices displayed on the transmissive display. In this case, the interval between the multiple indices may be set depending on whether the degree of change in the area of the multiple index images constituting the index pattern detected by the index pattern image detection means (for example, the rate of change, the amount of change, etc.) exceeds a predetermined threshold. Note that, for example, the predetermined threshold may be set in the direction in which the area of the index image decreases. Also, for example, the predetermined threshold may be set in the direction in which the area of the index image increases. Of course, the predetermined threshold may be set as an allowable range in the direction in which the area of the index image decreases and in the direction in which the area of the index image increases.

The interval setting means may set the interval between the multiple indices constituting the index pattern displayed on the transmissive display based on the acquisition result of the optical characteristic acquisition means (the calculation result of the calculation means). In this case, the interval between the multiple indices may be set using a table or the like that associates the refractive power of the eyeglass lens detected by the optical characteristic acquisition means with the interval between the multiple indices displayed on the transmissive display. In this case, the interval between the multiple indices may be set depending on whether the refractive power of the eyeglass lens detected by the optical characteristic acquisition means exceeds a predetermined threshold. For example, the predetermined threshold may be set in the direction in which the refractive power of the eyeglass lens increases (increases). For example, the predetermined threshold may be set in the direction in which the refractive power of the eyeglass lens decreases (decreases). Of course, the predetermined threshold may be set as an allowable range in the direction in which the refractive power of the eyeglass lens increases and in the direction in which the refractive power of the eyeglass lens decreases.

The interval setting means may set the interval between the multiple indices constituting the index pattern displayed on the transmissive display based on the determination result of the determination means. In this case, the interval between the multiple indices may be set using a table or the like that associates the type of eyeglass lens determined by the determination means with the interval between the indices displayed on the transmissive display.

In this embodiment, the spacing between the multiple indices displayed on the transmissive display may be set based on at least one of the detection result of the index pattern image detection means, the acquisition result of the optical characteristic acquisition means (the calculation result of the calculation means), and the judgment result of the judgment means, as described above.

The interval setting means may be capable of setting the interval between the multiple indices displayed on the transmissive display to two intervals, a first interval and a second interval different from the first interval. As one example, the interval setting means may set the second interval between the multiple indices displayed on the transmissive display to an interval shorter than the first interval between the multiple indices displayed on the transmissive display. Also, as another example, the interval setting means may set the second interval between the multiple indices displayed on the transmissive display to an interval longer than the first interval between the multiple indices displayed on the transmissive display.

Of course, for example, the interval setting means may be capable of setting a first interval, a second interval, and a third interval different from the first interval and the second interval between the multiple indices displayed on the transmissive display. As an example, the interval setting means may set the second interval between the multiple indices displayed on the transmissive display to a shorter interval than the first interval between the multiple indices displayed on the transmissive display, and may set the third interval between the multiple indices displayed on the transmissive display to a longer interval.

The interval setting means may set the intervals of at least some of the indices to different intervals in the first interval of the multiple indices and the second interval of the multiple indices. The interval setting means may set the intervals of at least some of the indices to different intervals in the first interval of the multiple indices, the second interval of the multiple indices, and the third interval of the multiple indices. For example, the intervals of the multiple indices may be set to different intervals only near the center of the index pattern formed by the arrangement of the multiple indices.

<Interval switching means>
The eyeglass lens measurement device in this embodiment includes a spacing switching means (e.g., a control unit 70). The spacing switching means switches between a first mode (e.g., a normal mode) in which a first spacing between a plurality of indices is set by the spacing setting means, and a second mode (e.g., a wide spacing mode) in which a second spacing between a plurality of indices is set by the spacing setting means. For example, the spacing switching means switches between the first mode and the second mode based on an instruction signal for switching between the first mode and the second mode. As an example, the measurement switching means may switch between the first mode and the second mode based on an instruction signal input by an operator operating the operating means. Also, as an example, the spacing switching means may switch between the first mode and the second mode based on an instruction signal output based on the detection result of the detector. For example, in this case, the spacing switching means may switch between the first mode and the second mode based on an instruction signal output based on the detection result of the detector. More specifically, the interval switching means may switch between the first mode and the second mode based on an instruction signal output based on at least one of the detection result of the index pattern image detection means, the acquisition result of the optical characteristic acquisition means (the calculation result of the calculation means), the judgment result of the judgment means, etc. This makes it possible to apply an appropriate mode in accordance with the eyeglass lens and easily acquire the optical characteristics of the eyeglass lens.

<Display Control Means>
The eyeglass lens measurement device in this embodiment includes a display control means (e.g., a control unit 70). The display control means controls the display of a plurality of indices on the transmissive display. That is, the display control means controls the display of an index pattern on the transmissive display. The display control means may express the index pattern by displaying a plurality of indices at a predetermined position on the transmissive display. The predetermined position may be a position specified by an operator, or may be a position set in advance. The display control means may also express the index pattern by displaying a plurality of indices having intervals set in an interval setting means. That is, the display control means may use different index patterns in correspondence with various eyeglass lenses.

For example, the display control means can display an index pattern, which is an array of multiple indexes, on the transmissive display. Also, for example, the display control means can hide the index pattern, which is an array of multiple indexes, on the transmissive display. Note that, for example, the display control means can partially display the multiple indexes on the transmissive display, partially hide the multiple indexes, and partially display the index pattern (or partially hide the index pattern).

In this embodiment, the display control means causes the transmissive display to display an index pattern, and the optical characteristics of the eyeglass lens are acquired by the optical characteristics acquisition means described below. Note that, for example, when the transmissive displays are arranged at different positions in the optical axis direction, the display control means causes the transmissive display capable of displaying the first index pattern to display the first index pattern, and causes the transmissive display capable of displaying the second index pattern to display the second index pattern, and the optical characteristics of the eyeglass lens are acquired by the optical characteristics acquisition means.

When the transmissive displays are arranged at different positions in the optical axis direction, the display control means may separately control the display of the first index pattern on the transmissive display capable of displaying the first index pattern and the display of the second index pattern on the transmissive display capable of displaying the second index pattern.

For example, in a transmissive display capable of displaying a first index pattern and a transmissive display capable of displaying a second index pattern, when one of the first index pattern and the second index pattern is displayed, at least a part of the other of the first index pattern and the second index pattern may be hidden. As an example, the display control means may hide the second index pattern when displaying the first index pattern, and display the second index pattern when hiding the first index pattern. Also, as an example, the display control means may hide the second index pattern (in other words, some of the multiple indexes) when displaying the first index pattern (in other words, all of the multiple indexes), and display the second index pattern (in other words, all of the multiple indexes) when hiding the first index pattern (in other words, some of the multiple indexes). This prevents the first index pattern image and the second index pattern image from overlapping, and allows the position of each index pattern image (index image) to be accurately detected, so that the optical characteristics are measured with high accuracy.

In addition, when the transmissive displays are arranged at different positions in the optical axis direction, the display control means may simultaneously (substantially simultaneously) control the display of the first index pattern on the transmissive display capable of displaying the first index pattern, and the display of the second index pattern on the transmissive display capable of displaying the second index pattern. For example, both the first index pattern and the second index pattern may be displayed on the transmissive display capable of displaying the first index pattern and the transmissive display capable of displaying the second index pattern. This allows the first index pattern image and the second index pattern image to be detected at the same time, thereby shortening the measurement time.

In this embodiment, the display control means causes at least a portion of the index pattern on the transmissive display to be hidden, and lens information of the eyeglass lens is acquired by the lens information acquisition means described below. For example, when the transmissive displays are arranged at different positions in the optical axis direction, the display control means causes at least a portion of the first index pattern on the transmissive display capable of displaying the first index pattern to be hidden, and causes at least a portion of the second index pattern on the transmissive display capable of displaying the second index pattern to be hidden, and thereby lens information of the eyeglass lens is acquired by the lens information acquisition means.

In such a case, the display control means may hide the index pattern (in other words, all of the multiple indices) on the transmissive display. In such a case, the display control means may hide some of the index patterns (in other words, some of the multiple indices). For example, the index patterns may be hidden only in an area where lens information of the eyeglass lens can be obtained. As one example, only the indices projected onto the eyeglass lens may be hidden, and the indices projected outside the eyeglass lens may be displayed. As another example, only the indices projected near the hidden mark formed on the eyeglass lens may be hidden, and the indices projected outside the vicinity of the hidden mark formed on the eyeglass lens may be displayed.

For example, in this embodiment, the display control means displays an index pattern on the transmissive display, and the optical characteristics of the eyeglass lens are acquired by the optical characteristics acquisition means described below, and the display control means makes at least a portion of the index pattern on the transmissive display invisible, and the lens information of the eyeglass lens is acquired by the lens information acquisition means described below. This makes it possible to acquire the optical characteristics and lens information of the eyeglass lens with a simple configuration, without providing an optical system for acquiring the optical characteristics or lens information, or requiring complex control.

In this embodiment, when the display control means is switched by the interval switching means between a first mode in which a first interval between the multiple indices is set and a second mode in which a second interval between the multiple indices is set, the display control means may display on the transmissive display either a first index pattern formed by indices having a first interval or a second index pattern formed by indices having a second interval. For example, by appropriately setting the first mode and the second mode, it is possible to accommodate both a spectacle lens in which the optical characteristics can be obtained with high accuracy by projecting an index pattern having a predetermined index interval, and a spectacle lens in which the optical characteristics are difficult to obtain with high accuracy by projecting an index pattern having a predetermined index interval.

<Optical property acquisition means>
The eyeglass lens measurement device in this embodiment includes an optical characteristic acquisition means (e.g., a control unit 70). The optical characteristic acquisition means acquires the optical characteristics of the eyeglass lens based on the detection result of the detector. The optical characteristic acquisition means may acquire a distribution of the optical characteristics of the eyeglass lens by acquiring optical characteristics for a plurality of positions on the eyeglass lens based on the detection result of the detector.

For example, the optical characteristic acquisition means may acquire the optical characteristics of the eyeglass lens by performing ray tracing processing on the measurement light beam from the light source. In this case, the optical characteristic acquisition means may acquire the optical characteristics of the eyeglass lens by determining position information of the passing position where the measurement light beam from the light source passes through at least two points in the optical axis direction. Furthermore, the optical characteristic acquisition means may use the position information of the passing position where the measurement light beam from the light source passes through at least two points in the optical axis direction to calculate the refraction angle at which the measurement light beam from the light source is refracted by the refractive power of the eyeglass lens, and acquire the optical characteristics of the eyeglass lens.

As an example, the optical characteristic acquisition means may acquire the optical characteristics of the eyeglass lens based on position information of the passing position of the measurement light beam from the light source passing through the eyeglass lens and position information of the passing position of the measurement light beam from the light source passing through the transmissive display. Also, as an example, the optical characteristic acquisition means may acquire the optical characteristics of the eyeglass lens based on position information of the passing position of the measurement light beam from the light source passing through the transmissive display capable of displaying a first index pattern and position information of the passing position of the measurement light beam from the light source passing through the transmissive display capable of displaying a second index pattern.

In this embodiment, the optical characteristic acquisition means may acquire the refractive power of the eyeglass lens as the optical characteristic of the eyeglass lens based on the detection result of the detector. That is, in this embodiment, the optical characteristic acquisition means may also serve as a calculation means that calculates the refractive power of the eyeglass lens based on the detection result of the detector.

<Means for acquiring lens information>
The eyeglass lens measurement device in this embodiment includes a lens information acquisition means (e.g., a control unit 70). The lens information acquisition means acquires lens information different from the optical characteristics of the eyeglass lens based on the detection result of the detector. For example, the lens information acquisition means may acquire lens information based on a signal (signal data) detected by the detector. As an example, the lens information acquisition means may acquire lens information based on the intensity of the signal detected by the detector. Also, for example, the lens information acquisition means may acquire lens information based on an image (image data) obtained by converting the signal detected by the detector. As an example, the lens information acquisition means may acquire lens information based on at least one of luminance information, saturation information, hue information, etc. of the image.

<Measurement switching means>
The eyeglass lens measuring device in this embodiment includes a measurement switching means (e.g., a control unit 70). The measurement switching means switches between a first mode (e.g., an optical characteristic measurement mode) in which the optical characteristics of the eyeglass lens are acquired by the optical characteristic acquisition means, and a second mode (e.g., a lens information acquisition mode) in which the lens information of the eyeglass lens is acquired by the lens information acquisition means. For example, the measurement switching means switches between the first mode and the second mode based on an instruction signal for switching between the first mode and the second mode. As an example, the measurement switching means may switch between the first mode and the second mode based on an instruction signal input by an operator operating the operation means. Also, as an example, the measurement switching means may switch between the first mode and the second mode based on an instruction signal output based on the detection result of the detector. For example, in this case, the measurement switching means may switch between the first mode and the second mode based on an instruction signal output by acquiring the optical characteristics of the eyeglass lens based on the detection result of the detector. In this case, for example, the measurement switching means may determine the type of the eyeglass lens based on the detection result of the detector, and switch between the first mode and the second mode based on an instruction signal output based on the determination result. This allows an appropriate mode to be applied according to the eyeglass lens, and makes it possible to easily obtain the optical characteristics and lens information of the eyeglass lens.

The present disclosure can be applied to a spectacle lens measuring device equipped with a measurement optical system (e.g., measurement optical system 20) for measuring the optical characteristics of a spectacle lens. As an example, the present disclosure can be applied to a cup attachment device that measures the optical characteristics of a spectacle lens by projecting a measurement light beam from a light source toward the spectacle lens and detecting the measurement light beam that passes through the spectacle lens with a detector, and attaches a cup used to process the periphery of the spectacle lens based on the measurement results.

Note that the present disclosure is not limited to the device described in this embodiment. For example, terminal control software (program) that performs the functions of the above embodiment can be supplied to a system or device via a network or various storage media, and the control device (e.g., a CPU) of the system or device can read and execute the program.

<Example>
An example of an eyeglass lens measuring device (hereinafter, measuring device) according to the present embodiment will be described. In this example, the left-right direction of the measuring device 1 is represented as the X direction, the up-down direction (vertical direction) as the Y direction, and the front-rear direction as the Z direction.

Figure 1 is an external view of the measuring device 1. For example, the measuring device 1 includes a housing 2, a storage section 3, a monitor 4, etc.

The housing 2 has a storage section 3 therein. The storage section 3 stores the eyeglass support unit 10 described below, the lens measurement unit described below, etc. The monitor 4 displays various information (e.g., the optical characteristics of the lens LE, the distribution of the optical characteristics of the lens LE, the hidden mark image 65 of the lens LE, etc.). The monitor 4 is a touch panel. In other words, the monitor 4 also functions as an operation section, and is used when the operator performs various settings (e.g., changing the interval between the indicators, starting measurement, switching modes, etc.). A signal corresponding to the operation instruction input from the monitor 4 by the operator is output to the control section 70 described below.

Figure 2 is a schematic diagram of the eyeglass support unit 10 and the lens measurement unit.

<Support unit>
The glasses support unit 10 is used for placing the glasses F. For example, the glasses support unit 10 includes a positioning pin 11, a front support portion 12, a rear support portion 13, and the like.

The positioning pin 11 is abutted against the rear surface of the lens LE in the glasses F. The positioning pin 11 keeps the positional relationship between the lens LE and the transmissive display 24 (described below) constant. The positioning pin 11 also keeps the positional relationship between the lens LE and the image sensor 27 (described below) constant.

The front support portion 12 supports a portion in front of the center of the front-rear direction (i.e., the direction in which the temples FT of the glasses F extend) when the glasses F are worn. For example, the front support portion 12 supports the bridge FB of the glasses F. The front support portion 12 is not limited to this embodiment, and may support the rims of the glasses F, as an example. The rear support portion 13 supports a portion in back of the center of the front-rear direction when the glasses F are worn. For example, the rear support portion 13 supports the temples FT of the glasses F. The rear support portion 13 is not limited to this embodiment, and may support the temples FM of the glasses F, as an example. For example, in this embodiment, the glasses F are placed on the front support portion 12 and the rear support portion 13 with the upper end of the rim of the glasses F facing upward and the lower end of the rim of the glasses F facing downward.

The front support part 12 and the rear support part 13 may be arranged to be movable on the base 5. For example, the front support part 12 may be arranged to be movable in the vertical direction (Y direction) by a drive mechanism not shown. Also, for example, the rear support part 13 may be arranged to be movable in the vertical direction (Y direction) by a drive mechanism not shown. For example, by moving at least one of the front support part 12 and the rear support part 13 in the vertical direction, the forward tilt angle of the glasses F when the glasses F are worn can be adjusted. Also, for example, by moving at least one of the front support part 12 and the rear support part 13 in the vertical direction, the rear surface of the lens LE of the glasses F and the bottom surface of the positioning pin 11 can be made parallel (approximately parallel).

<Lens measurement unit>
The lens measurement unit is used to measure optical characteristics of a lens LE framed in the spectacles F. The lens measurement unit is also used to detect information other than the optical characteristics of the lens LE framed in the spectacles F. For example, the lens measurement unit includes a measurement optical system 20.

In this embodiment, the measurement optical system 20 uses a light source 21 that serves both as a light source for irradiating the left lens LE1 of the glasses F with a measurement light beam and as a light source for irradiating the right lens LEr of the glasses F with a measurement light beam. In addition, in this embodiment, the measurement optical system 20 uses an image sensor 27 that serves both as an image sensor for detecting the measurement light beam irradiated to the left lens LE1 of the glasses F and as an image sensor for detecting the measurement light beam irradiated to the right lens LEr of the glasses F. Note that the measurement optical system 20 is not limited to this configuration, and various configurations can be used. For example, the measurement optical system 20 includes a light source 21, a half mirror 22, a collimator lens 23, a transmissive display 24, a retroreflective member 25, an image sensor 27, etc.

The light source 21 irradiates a measurement light beam toward the lens LE of the eyeglasses F. The collimator lens 23 shapes the measurement light beam from the light source 21 to be parallel (approximately parallel) to the optical axis N1.

The transmissive display 24 is a highly transmittance display that can transmit the measurement light beam from the light source 21. The transmissive display 24 can display an index pattern 30, which will be described later. For example, by displaying the index pattern 30 on the transmissive display 24, the index pattern 30 is formed in the measurement light beam when the measurement light beam from the light source 21 transmits through the transmissive display 24. Note that, for example, if the transmissive display 24 is not displayed, the measurement light beam from the light source 21 passes through the transmissive display 24 and the index pattern 30 is not formed in the measurement light beam.

In this embodiment, a first transmissive display 24a and a second transmissive display 24b are provided as the transmissive display 24. The first transmissive display 24a and the second transmissive display 24b are arranged so that their respective vertical and horizontal centers coincide with the optical axis L1. The first transmissive display 24a and the second transmissive display 24b are also arranged at a predetermined distance ΔD in the direction of the optical axis N1.

The retroreflective member 25 reflects the measurement light beam from the light source 21 in the same (approximately the same) direction as the incident direction, illuminating the lens LE of the eyeglasses F from the rear surface. The retroreflective member 25 may be rotated at high speed by a drive mechanism 26 (e.g., a motor, etc.). This makes it possible to uniformize the uneven reflection caused by the variation in the distribution of the small glass spheres (not shown), the reflective film (not shown), etc. that the retroreflective member 25 has.

The imaging element 27 captures an image of the reflected light beam that is the measurement light beam from the light source 21 reflected by the retroreflective member 25. The focal point of the imaging element 27 is adjusted to the vicinity of the front surface of the lens LE of the glasses F. Therefore, for example, a hidden mark formed on the lens LE of the glasses F is imaged in a nearly focused state.

For example, the measurement light beam from the light source 21 passes through the half mirror 22, is collimated by the collimator lens 23, and reaches the lens LE of the glasses F. Next, as the measurement light beam passes through the lens LE, it is converged or diverged by the refractive power of the lens LE, passes through the transmissive display 24, and reaches the retroreflective member 25. The measurement light beam is further reflected by the retroreflective member 25, passes through the transmissive display 24, the lens LE, and the collimator lens 23 again, is reflected by the half mirror 22, and reaches the image sensor 27. The image sensor 27 captures an image of the measurement light beam that has passed through each member.

<Indicator Pattern>
3 shows an example of an index pattern 30 that can be displayed on the transmissive display 24. Here, a first index pattern 30a that can be displayed on the first transmissive display 24a is taken as an example. Note that a second index pattern 30b that can be displayed on the second transmissive display 24b has the same configuration as described below, and therefore a description thereof will be omitted.

The first transmissive display 24a is capable of displaying an index 31 on the screen. The index 31 consists of a peripheral index 31a and a reference index 31b.

For example, the peripheral indices 31a are provided in advance around the reference indices 31b with a predetermined shape, a predetermined position, and a predetermined number, etc. In this embodiment, the peripheral indices 31a are formed in a circular shape. In this embodiment, the peripheral indices 31a are arranged in the right region 33a on the side where the left lens LEl of the glasses F is arranged, and in the left region 33b on the side where the right lens LEr of the glasses F is arranged. The peripheral indices 31a are arranged in the right region 33a and the left region 33b so as to be symmetrical with respect to the vertical axis (Y direction) passing through the passing position I of the optical axis L1. In this embodiment, a large number of peripheral indices 31a are arranged.

For example, the reference indicators 31b only need to be distinguishable from the peripheral indicators 31a, and are provided in advance with a predetermined shape, predetermined position, and predetermined number, etc. In this embodiment, the reference indicators 31b are formed in a circle that is larger than the peripheral indicators 31a. In this embodiment, the reference indicators 31b are arranged in the right region 33a and the left region 33b so as to be symmetrical with respect to the vertical axis (Y direction) that passes through the passing position I of the optical axis L1. In this embodiment, four reference indicators 31b are arranged. For example, the reference indicators 31b make it easier to identify the positional relationship of each peripheral indicator 31a.

The first transmissive display 24a displays a plurality of indices 31 to represent a first index pattern 30a formed by the plurality of indices 31. As an example, as shown in FIG. 3(a), a first index pattern 30a can be displayed in which the distance between the plurality of indices 31 is a distance S1. As another example, as shown in FIG. 3(b), a first index pattern 30a can be displayed in which the distance between the plurality of indices 31 is a distance S2 that is shorter than the distance S1. As another example, as shown in FIG. 3(c), a first index pattern 30a can be displayed in which the distance between the plurality of indices 31 is a distance S3 that is longer than the distance S1. For example, the display and non-display of the plurality of indices 31 is controlled by a control unit 70 described below.

The first transmissive display 24a may display the first index pattern 30a formed by the multiple indexes 31 by arranging one index 31 at equal intervals as a display unit (segment) and applying or not applying a voltage to each segment. In other words, the first transmissive display 24a may display the first index pattern 30a formed by the multiple indexes 31 by segment display. For example, when a voltage is applied to a segment, the index 31 is displayed. For example, when no voltage is applied to the segment or when the application of voltage to the segment is stopped, the index 31 is not displayed. For example, each index 31 may be formed by printing.

For example, if a voltage is applied to all segments provided on the first transmissive display 24a, the indicators 31 are displayed in all segments. In this case, a first indicator pattern 30a can be expressed in which the intervals between the multiple indicators 31 are a predetermined distance (i.e., the shortest distance that can be expressed by the multiple indicators 31). Also, if a voltage is applied to a specific segment provided on the first transmissive display 24a, the indicators 31 are displayed only in the specific segment. In this case, as an example, a first indicator pattern 30a can be expressed in which a voltage is applied to every other segment and the intervals between the multiple indicators 31 are longer than the shortest distance described above. Of course, a first indicator pattern 30a can also be expressed in which a voltage is applied to every second, third, fourth, or other segment, and the intervals between the multiple indicators 31 are longer.

In this embodiment, the first index pattern 30a of the first transmissive display 24a and the second index pattern 30b of the second transmissive display 24b are configured to have the same pattern. That is, the shape of the index 31 in the first index pattern 30a and the shape of the index 31 in the second index pattern 30b are configured to be the same. Also, the position of the index 31 in the first index pattern 30a and the position of the index 31 in the second index pattern 30b are configured to be the same. Also, the number of indexes 31 in the first index pattern 30a and the number of indexes 31 in the second index pattern 30b are configured to be the same.

However, in this embodiment, the first index pattern 30a of the first transmissive display 24a and the second index pattern 30b of the second transmissive display 24b may be configured to have at least a part of different patterns. That is, the shape of the index 31 in the first index pattern 30a and the shape of the index 31 in the second index pattern 30b may be configured to be different. Also, the position of the index 31 in the first index pattern 30a and the position of the index 31 in the second index pattern 30b may be configured to be different. Also, the number of indexes 31 in the first index pattern 30a and the number of indexes 31 in the second index pattern 30b may be configured to be different.

<Index pattern image>
For example, when the measurement light beam from the light source 21 is captured by the image sensor 27, the electrical signal is processed by the control unit 70 (to be described later) to obtain a captured image.

Figure 4 is an example of a captured image obtained by displaying the first index pattern 30a on the first transmissive display 24a. Figure 4(a) shows a state in which the glasses F are not placed on the glasses support unit 10. Figure 4(b) shows a state in which the glasses F are placed on the glasses support unit 10. Figure 5 is an example of a captured image obtained by displaying the second index pattern 30b on the second transmissive display 24b. Figure 5(a) shows a state in which the glasses F are not placed on the glasses support unit 10. Figure 5(b) shows a state in which the glasses F are placed on the glasses support unit 10.

Note that in Figures 4 and 5, a case is taken as an example in which the lens LE of the glasses F is a minus lens, and an image of the right lens LEr of the glasses F is illustrated. Also, for convenience, in Figures 4 and 5, the shape of the first index pattern 30a and the shape of the second index pattern 30 are illustrated as different shapes.

First, the reference state in which the glasses F are not placed on the glasses support unit 10 will be described. When the first index pattern 30a is displayed on the first transmissive display 24a in the reference state, the measurement light beam from the light source 21 is formed in the shape of the first index pattern 30a. Therefore, as shown in FIG. 4A, a reference image B1 including an image of the first index pattern 30a (hereinafter, first index pattern image 41) is acquired as the captured image. Also, when the second index pattern 30b is displayed on the second transmissive display 24b in the reference state, the measurement light beam from the light source 21 is formed in the shape of the second index pattern 30b. Therefore, as shown in FIG. 5A, a reference image B2 including an image of the second index pattern 30b (hereinafter, second index pattern image 51) is acquired as the captured image.

In this embodiment, the positions and number of the multiple indexes 31 in the first index pattern 30a are the same as the positions and number of the multiple indexes 31 in the second index pattern 30b. Therefore, in the reference state, the pixel position of each index image in the reference image B1 is the same as the pixel position of each index image in the reference image B2. As an example, the pixel position of point P1 corresponding to the fourth index image from the left and the third index image from the top in the first index pattern image 41 is the same as the pixel position of point P2 corresponding to the fourth index image from the left and the third index image from the top in the second index pattern image 51.

Next, the measurement state in which the glasses F are placed on the glasses support unit 10 will be described. When the first index pattern 30a is displayed on the first transmissive display 24a in the measurement state, the measurement light beam from the light source 21 is formed into the first index pattern 30a shape, and the measurement light beam from the light source 21 is refracted and converged by the refractive power of the lens LE. Therefore, as shown in FIG. 4B, a measurement image M1 is acquired as the captured image, which includes a first index pattern image 41, at least a part of which is reduced to a circular shape compared to the reference state, and an image of the right lens LEr (hereinafter, right lens image 60). Also, when the second index pattern 30b is displayed on the second transmissive display 24b in the measurement state, the measurement light beam from the light source 21 is formed into the second index pattern 30b shape, and the measurement light beam from the light source 21 is refracted and converged by the refractive power of the lens LE. Therefore, as shown in FIG. 5B, the captured image is a measurement image M2 that includes a second index pattern image 51, at least a portion of which is reduced to a circular shape compared to the reference state, and a right lens image 60.

In this embodiment, each transmissive display is arranged so that the distance from the lens LE to the second transmissive display 24b is greater than the distance from the lens LE to the first transmissive display 24a. Therefore, in the measurement state, the second index pattern image 51 in the measurement image M2 appears as a smaller image than the first index pattern image 41 in the measurement image M1, and the pixel position of each index image in the measurement image M1 is different from the pixel position of each index image in the measurement image M2. As an example, the pixel position of point P1' corresponding to the fourth index image from the left and the third index image from the top in the first index pattern image 41 is different from the pixel position of point P2' corresponding to the fourth index image from the left and the third index image from the top in the second index pattern image 51.

For example, in the above, the lens LE of the glasses F is a minus lens, but if the lens LE is a plus lens, the measurement light beam from the light source 21 is refracted and diverged by the refractive power of the lens LE. Therefore, in the measurement state, the first index pattern image 41 and the second index pattern image 51 are acquired, at least a part of which is enlarged to a circular shape compared to the reference state. The second index pattern image 51 in the measurement image M2 appears as a larger image than the first index pattern image 41 in the measurement image M1. Also, if the lens LE is an astigmatism lens, the first index pattern image 41 and the second index pattern image 51 are acquired, at least a part of which is changed to an elliptical shape compared to the reference state. Also, if the lens LE is a progressive lens, the first index pattern image 41 and the second index pattern image 51 are acquired, which are changed according to the refractive power of the progressive band.

<Control Unit>
6 is a diagram showing a control system of the measurement device 1. For example, the monitor 4, the light source 21, the drive mechanism 26, the image sensor 27, the first transmissive display 24a, the second transmissive display 24b, a non-volatile memory 75 (hereinafter, memory 75), and the like are electrically connected to the control unit 70.

For example, the control unit 70 is realized by a general CPU (processor), RAM, ROM, etc. For example, the CPU controls the operation of each part in the measuring device 1. For example, the RAM temporarily stores various information. For example, the ROM stores various programs executed by the CPU. Note that the control unit 70 may be configured by multiple control units (i.e., multiple processors).

Memory 75 may be a non-transient storage medium capable of retaining stored contents even when the power supply is cut off. For example, memory 75 may be a hard disk drive, a flash ROM, a USB memory, or the like. For example, memory 75 stores reference image B1 and reference image B2 in the reference state, measurement images M1 and M2 in the measurement state, and the like.

<Control operation>
The control operation of the measuring device 1 will now be described.

The operator receives the wearer's eyeglasses F and places the eyeglasses F on the eyeglass support unit 10. The operator also moves at least one of the front support part 12, the rear support part 13, and the positioning pin 11 to complete the alignment of the eyeglasses F with the measurement optical system 20.

Then, the operator sets either the optical characteristic measurement mode for acquiring the optical characteristics of the lens LE of the glasses F, or the lens information acquisition mode for acquiring lens information different from the optical characteristics. The operator operates the monitor 4 to select a mode setting button (not shown). The control unit 70 sets either the optical characteristic measurement mode or the lens information acquisition mode in response to an input signal from the monitor 4.

<Obtaining the optical characteristics of the lens>
The optical characteristic measurement mode will be described in detail below. In the optical characteristic measurement mode, the first transmissive display 24a and the second transmissive display 24b are displayed, and the first index pattern 30a and the second index pattern 30b are projected onto the lens LE, thereby obtaining the optical characteristics of the lens LE. In this embodiment, when the first transmissive display 24a is displayed, the second transmissive display 24b is not displayed, and when the first transmissive display 24a is not displayed, the second transmissive display 24b is displayed, and the first index pattern 30a and the second index pattern 30b are projected onto the lens LE in order, thereby obtaining the optical characteristics of the lens LE.

When the optical characteristic measurement mode is set, the control unit 70 turns on the light source 21. The control unit 70 also causes the first transmissive display 24a to display a predetermined first index pattern 30a. The second transmissive display 24b is not displayed, and does not display the predetermined second index pattern 30b. The measurement light beam from the light source 21 diverges, is shaped into parallel light by the collimator lens 23, and is simultaneously irradiated onto the left lens LEl and the right lens LEr. The measurement light beam from the light source 21 is also refracted by each of the left lens LEl and the right lens LEr, and is formed into the first index pattern 30a by passing through the first transmissive display 24a, passes through the second transmissive display 24b, is reflected in the original direction by the retroreflective member 25, and reaches the image sensor 27. The control unit 70 acquires a measurement image M1 including the first index pattern image 41, the left lens image, and the right lens image 60 based on the imaging result of the image sensor 27. The control unit 70 also stores the measurement image M1 in the memory 75.

Then, the control unit 70 makes the first transmissive display 24a invisible and makes the second transmissive display 24b display a predetermined second index pattern 30b. As a result, the measurement light beam from the light source 21 is refracted by each of the left lens LEl and the right lens LEr, passes through the first transmissive display 24a, and is formed into the second index pattern 30b by passing through the second transmissive display 24b, and is reflected back in the original direction by the retroreflective member 25 to reach the image sensor 27. The control unit 70 obtains a measurement image M2 including the second index pattern image 51, the left lens image, and the right lens image 60 based on the imaging result of the image sensor 27. The control unit 70 also stores the measurement image M1 in the memory 75.

The control unit 70 acquires the optical characteristics of the left lens LEl and the right lens LEr based on the measurement image M1 and the measurement image M2. For example, the control unit 70 acquires the optical characteristics of the left lens LEl and the right lens LEr from the amount of change in the spacing between the index images that form the first index pattern image 41 and the second index pattern image 51.

Figure 7 is a schematic diagram showing the measurement light beam from the light source 21. For example, the measurement light beam (light ray R1) from the light source 21 is refracted as it passes through the position of point Q1 on the lens LE. Note that the position of point Q1 on the lens LE in the XY directions corresponds to the pixel position of a specified index image in the reference image B1 (e.g., the pixel position of point P1) and the pixel position of a specified index image in the reference image B2 (e.g., the pixel position of point P2), and therefore can be found based on either the reference image B1 or the reference image B2.

The control unit 70 detects where in the measurement image M1 the index image in the reference image B1 in the reference state has moved when the glasses F are placed and the measurement state is established. For example, the control unit 70 detects the pixel position of each index image forming the first index pattern image 41 for the measurement image M1. Also, for example, the control unit 70 compares the pixel position of each index image in the measurement image M1 with the pixel position of each index image in the reference image B1. This detects, for example, that the light ray R1 has passed through the first transmissive display 24a and point P1 in the reference image B1 has moved to point P1' in the measurement image M1.

Similarly, the control unit 70 detects where in the measurement image M2 the index image in the reference state B2 has moved to when the glasses F are placed and the measurement state is established. For example, the control unit 70 detects the pixel position of each index image forming the second index pattern image 51 in the measurement image M2 and compares it with the pixel position of each index image in the reference image B2. This detects, for example, that the light ray R1 has passed through the second transmissive display 24b and point P2 in the reference image B2 has moved to point P2' in the measurement image M2.

Next, the control unit 70 calculates the refraction angle θ at which the light ray R1 from the light source 21 is refracted by the lens LE. For example, the refraction angle θ of the light ray R1 can be calculated from a trigonometric function using the distance ΔD from the first transmissive display 24a to the second transmissive display 24b, the position of point P1' in the XY directions where the light ray R1 passes through the first transmissive display 24a, and the position of point P2' in the XY directions where the light ray R1 passes through the second transmissive display 24b.

The control unit 70 calculates the refraction angles (i.e., angles θ1 and θ2) at which the measurement light beam from the light source 21 is refracted as it passes through at least two points on the lens LE (in this embodiment, two points: point Q1 and point Q2 different from point Q1) as described above. The control unit 70 also calculates the position of the focal length f of the lens LE and the position of the optical center O of the lens LE based on the positions of at least two points on the lens LE. For example, the position of the focal length f of the lens LE and the position of the optical center O of the lens LE can be obtained by the following formulas.

The position of the optical center O of the lens LE can also be found using the position of the point Q2 where the light ray R2 passes through the lens LE and the refraction angle θ2 at which the light ray R2 is refracted by the lens LE.

Figure 8 is a diagram showing the meridian directions of the lens LE. The control unit 70 sets two arbitrary points (points C1 and C2 in Figure 8) at positions a predetermined distance away from the position of the optical center O of the lens LE in a predetermined meridian direction. For example, the control unit 70 sets a predetermined meridian direction for each predetermined angle α. That is, if the predetermined angle α is 45 degrees, the meridian directions are set to 0 degrees, 45 degrees, 90 degrees, ..., 315 degrees. Also, for example, the control unit 70 sets a predetermined distance so that the distance from the optical center O to point C1 is the same in each meridian direction. Also, for example, the control unit 70 sets a predetermined distance so that the distance from the optical center O to point C2 is the same in each meridian direction.

The control unit 70 then calculates the position of the focal length f in each meridian direction from any two points in each meridian direction, and obtains the refractive power E of the lens LE in each meridian direction. The refractive power E of the lens LE is expressed as the reciprocal of the focal length f. The control unit 70 also creates a graph in which the refractive power E of the lens LE is plotted on the vertical axis and a predetermined angle α on the horizontal axis, and obtains an approximation curve using the least squares method. For example, such an approximation curve is expressed by the following formula. Note that a, b, and c in the formula are constants.

The control unit 70 acquires the optical characteristics of the lens LE (e.g., spherical power, cylindrical power, astigmatism axis angle, etc.) based on the approximation curve. The control unit 70 also causes the monitor 4 to display the optical characteristics of the lens LE.

The control unit 70 may obtain the distribution of the optical characteristics of the lens LE by repeating the calculation of the refraction angle and refractive power of the light ray described above at multiple positions excluding the position of the optical center O of the lens LE. The control unit 70 may display a map image showing the distribution of the optical characteristics of the lens LE on the monitor 4. For example, the map image may be presented together with the image of the eyeglass frame by being superimposed on the left lens image and the right lens image 60 in the measurement image M1 or the measurement image M2. By checking this information, the operator can grasp the optical characteristics of the lens LE and the distribution of the optical characteristics of the lens LE.

<Obtaining lens information>
The lens information acquisition mode will be described in detail below. In the lens information acquisition mode, the first transmissive display 24a and the second transmissive display 24b are hidden to acquire lens information of the lens LE. Note that, here, a case where a hidden mark of the lens LE is detected as the lens information of the lens LE is taken as an example.

When the lens information acquisition mode is set, the control unit 70 turns on the light source 21. The control unit 70 also turns off the first transmissive display 24a and the second transmissive display 24b. The control unit 70 also drives the drive mechanism 26 to rotate the retroreflective member 25 at high speed. The measurement light beam from the light source 21 diverges, is shaped into parallel light by the collimator lens 23, and is simultaneously irradiated onto the left lens LEl and the right lens LEr. The measurement light beam from the light source 21 is also refracted by each of the left lens LEl and the right lens LEr, passes through the first transmissive display 24a and the second transmissive display 24b, is reflected back to the original direction by the retroreflective member 25, and reaches the image sensor 27. The control unit 70 processes an electrical signal based on the image pickup result of the image sensor 27 to obtain a measurement image M3.

Figure 9 is an example of a measurement image M3. For example, the measurement image M3 is acquired as an image including a left lens image and a right lens image 60. In this embodiment, the measurement light beam from the light source 21 is reflected using the retroreflective member 25 to illuminate the rear surfaces of the left lens LEl and the right lens LEr. This makes it possible to obtain a measurement image M3 with high contrast, in which the lens images (left lens image and right lens image 60), the hidden mark image 65 described below, etc., are clearly visible.

The control unit 70 detects edges from the rising and falling edges of luminance in the measurement image M3, and detects the hidden mark image 65. The control unit 70 also causes the hidden mark image 65 of the lens LE to be displayed on the monitor 4. By checking the hidden mark image 65, the operator can ascertain the refractive index, add power, progressive zone length, etc. of the lens LE.

In the present embodiment, a configuration in which the operator manually selects either the optical characteristic measurement mode or the lens information acquisition mode has been described as an example, but the present invention is not limited to this. Of course, the control unit 70 may be configured to automatically select either the optical characteristic measurement mode or the lens information acquisition mode. As an example, the control unit 70 may set the lens information acquisition mode based on the type of lens LE.

The control unit 70 acquires a measurement image M1 including the first index pattern image 41, and determines the type of the lens LE based on the change in the interval between each index image forming the first index pattern image 41. For example, if the lens LE is a spherical lens (minus lens or plus lens) or an astigmatism lens, the interval between each index image forming the first index pattern image 41 is enlarged or reduced at a constant rate. For this reason, the control unit 70 can determine that the lens LE is a spherical lens or an astigmatism lens when the distance K1 between the index images detected in the measurement image M1 is equal (approximately equal). Also, for example, if the lens LE is a progressive lens, the interval between each index image forming the first index pattern image 41 becomes narrower as it approaches the near point from the far point according to the refractive power of the progressive zone. For this reason, the control unit 70 can determine that the lens LE is a progressive lens when the distance K1 between the index images detected in the measurement image M1 gradually becomes narrower (or wider). For example, when the control unit 70 determines that the lens LE is a progressive lens, it may set the lens information acquisition mode to detect the hidden mark image 65 on the lens LE.

<Change in spacing of indicators>
When acquiring the optical characteristics of the lens LE, the interval between the target images forming the target pattern image changes significantly depending on the refractive power of the lens LE. In particular, the higher the lens LE is, the stronger the refractive power of the lens LE is, and therefore the greater the change in the interval between the target images.

As an example, the more negative the lens LE is and the higher the optical power, the more each index image is reduced to a circular shape and the narrower the distance between the index images. In this case, adjacent index images may overlap or intersect in the measurement image, making them difficult to distinguish from one another. For example, if the optical characteristics of the lens LE are measured in this state, it is not possible to accurately obtain positional information where the measurement light beam from the light source passes through the transmissive display, making it difficult to maintain a certain level of measurement accuracy.

As another example, the more positive the lens LE is and the higher the magnification, the more circular the index images will be and the wider the spacing between the index images will be. In this case, it may not be possible to obtain a sufficient number of index images in the measurement image. For example, if the optical characteristics of the lens LE are measured in this state, there will be insufficient information on the position where the measurement light beam from the light source passes through the transmissive display, making it difficult to maintain a certain level of measurement accuracy.

Therefore, in this embodiment, the spacing between each index image in the measurement image is detected, and the application of voltage to a specific segment provided on the transmissive display is controlled based on the detection result. This makes it possible to change the spacing between the indexes 31 according to the lens LE and to express an appropriate index pattern.

Hereinafter, a detailed description will be given of changing the interval between the indices 31, taking as an example a case where the lenses LE of the glasses F are minus lenses. For example, in this embodiment, the control unit 70 automatically sets either a normal mode in which the multiple indices 31 are displayed on the first transmissive display and the second transmissive display at a predetermined interval, or a wide interval mode in which the multiple indices 31 are displayed on the first transmissive display and the second transmissive display at an interval wider than the predetermined interval.

<Normal mode>
The normal mode will be described in detail below. When measuring the optical characteristics of the lens LE, the control unit 70 first sets the normal mode. For example, in the normal mode, a voltage is applied to every other segment that displays the multiple indices 31, and a first index pattern 30a (see FIG. 3A) in which the interval between the multiple indices 31 is a predetermined distance S1 is displayed on the first transmissive display 24a. At this time, a measurement image M1 including a first index pattern image 41 in which the interval between each index image (hereinafter, first index image) is reduced due to the refractive power of the lens LE is acquired. For example, the control unit 70 analyzes the measurement image M1 to detect the pixel position of the first index image, and calculates the distance K1 (see FIG. 4B) between the first index images based on the pixel positions of the adjacent first index images.

The control unit 70 determines whether the distance K1 between the first index images exceeds a distance set as a predetermined threshold. For example, if the distance K1 between the first index images is longer than the predetermined threshold, the control unit 70 determines that the distance K1 is less than the threshold. Also, if the distance K1 between the first index images is shorter than the predetermined threshold, the control unit 70 determines that the distance K1 exceeds the threshold. The predetermined threshold may be stored in advance in the memory 75 based on experiments, simulations, etc.

When the control unit 70 determines that the distance K1 between the first index images is less than the threshold value, it stores in the memory 75 a measurement image M1 including a first index pattern image 41 in which the first index image is spaced at the distance K1. Next, the control unit 70 applies a voltage to each of the segments displaying the multiple indexes 31 alternately, and displays on the second transmissive display 24b a second index pattern 30b in which the multiple indexes 31 are spaced at a predetermined distance S1. This results in a measurement image M2 including a second index pattern image 51 in which the distance between each index image (hereinafter, second index image) is K2, which is stored in the memory 75. The control unit 70 acquires the optical characteristics of the lens LE based on the measurement image M1 and the measurement image M2.

<Wide interval mode>
The wide interval mode will be described in detail below. For example, the wide interval mode is set when it is determined that the distance K1 between the first index images exceeds a threshold value in the normal mode. For example, in the wide interval mode, a voltage is applied to all segments that display the multiple indexes 31, and the first index pattern 30a, in which the distance between the multiple indexes 31 is longer than a predetermined distance S1, is displayed on the first transmissive display 24a.

For example, when the control unit 70 determines that the distance K1 between the first index images exceeds the threshold value, it changes the voltage applied to each segment that displays the multiple indices 31 on the first transmissive display 24a, and applies voltage to all segments that display the multiple indices 31. As a result, for example, the first index pattern 30a (see FIG. 3(c)) in which the distance between the multiple indices 31 is a distance S3 longer than the predetermined distance S1 is displayed on the first transmissive display 24a. At this time, due to the refractive power of the lens LE, a measurement image M1 is obtained that includes a first index pattern image 41 in which the distance between the first index images is longer than the distance K1. The control unit 70 stores this measurement image M1 in the memory 75.

Then, the control unit 70 applies a voltage to all segments displaying the multiple indices 31, causing the second transmissive display 24b to display a second index pattern 30b in which the spacing between the multiple indices 31 is a distance S3 that is longer than the predetermined distance S1. This results in the acquisition of a measurement image M2 including a second index pattern image 51 in which the spacing between the second index images is longer than the distance K2. The control unit 70 stores this measurement image M2 in the memory 75.

In this way, the control unit 70 changes the spacing between the multiple indicators 31 depending on the lens LE to obtain appropriate measurement images M1 and M2, and obtains the optical characteristics of the lens LE based on these measurement images.

In the above, the wide interval mode is set when it is determined that the distance K1 between the first index images exceeds a threshold value, but the present invention is not limited to this. For example, the wide interval mode may be set when the distance K1 between the first index images is not detected due to overlapping of the first index images, etc.

In the above, the first index pattern 30a, in which the interval between the multiple indices 31 is a predetermined distance S1, is displayed on the first transmissive display 24a, and the normal mode is automatically switched to the wide interval mode based on whether or not the distance K1 between the first index images detected at this time exceeds a threshold value. However, this is not limited to the above. Of course, the second index pattern 30b, in which the interval between the multiple indices 31 is a predetermined distance S1, may be displayed on the second transmissive display 24b, and the normal mode may be automatically switched to the wide interval mode based on whether or not the distance K2 between the second index images detected at this time exceeds a preset threshold value. For example, if the measurement image M1 is acquired in the normal mode and then the measurement image M2 is acquired in the wide interval mode, the measurement image M1 may be acquired again in the wide interval mode.

As described above, for example, the eyeglass lens measurement device in this embodiment is equipped with a transmissive display that transmits the measurement light beam from the light source and can display an index pattern formed by an arrangement of multiple indexes, and acquires the optical characteristics of the eyeglass lens by displaying the index pattern on the transmissive display, and acquires lens information of the eyeglass lens (as an example, hidden mark information) by not displaying at least a portion of the index pattern on the transmissive display. This makes it possible to acquire the optical characteristics and lens information of the eyeglass lens with a simple configuration, for example, without providing an optical system for obtaining the optical characteristics or lens information, or requiring complex control.

For example, the eyeglass lens measurement device in this embodiment has a first transmissive display capable of displaying a first index pattern, and a second transmissive display capable of displaying a second index pattern, the second transmissive display being disposed at a different position in the optical axis direction from the first transmissive display, and a detector detects a measurement light beam that has passed through the first transmissive display and then the second transmissive display. For example, by disposing the transmissive displays at different positions in the optical axis direction, it is possible to obtain the optical characteristics of the eyeglass lens with high accuracy with a simple configuration without providing a mechanism for moving the eyeglass lens or the transmissive display in the optical axis direction. More specifically, the refraction angle at which the measurement light beam from the light source is refracted by the refractive power of the eyeglass lens is obtained, and based on this, the optical characteristics of the eyeglass lens can be obtained with high accuracy.

For example, the eyeglass lens measurement device in this embodiment has a first transmissive display capable of displaying a first index pattern and a second transmissive display capable of displaying a second index pattern, and when the first index pattern is displayed, at least a portion of the second index pattern is hidden, and when at least a portion of the first index pattern is hidden, the second index pattern is displayed. This prevents the first index pattern image and the second index pattern image from overlapping, and allows the position of each index pattern image (index image) to be accurately detected, allowing the optical characteristics to be measured with high precision.

For example, the eyeglass lens measurement device in this embodiment includes a retroreflective member that is capable of illuminating the eyeglass lens by reflecting the measurement light beam that is irradiated from the light source toward the eyeglass lens and passes through the eyeglass lens and the transmissive display back in the direction of incidence, and a detector detects the reflected light beam that is the measurement light beam from the light source reflected by the retroreflective member. This makes it possible to obtain an eyeglass lens image and an index pattern image (index image) projected onto the eyeglass lens with high contrast, thereby improving the detection accuracy of these images.

Furthermore, for example, the eyeglass lens measurement device in this embodiment switches between a first mode for acquiring the optical characteristics of the eyeglass lens and a second mode for acquiring lens information of the eyeglass lens. Therefore, for example, an appropriate mode can be applied according to the eyeglass lens, and the optical characteristics and lens information of the eyeglass lens can be easily acquired.

In addition, the eyeglass lens measuring device in this embodiment irradiates a measurement light beam from the light source toward both the left lens and the right lens of the eyeglass lens, and detects the measurement light beam that has passed through the left lens and the transmissive display and the measurement light beam that has passed through the right lens and the transmissive display with a detector. Therefore, the measurement optical system can be easily configured and the optical characteristics and lens information of the eyeglass lens can be obtained by simple control. Note that, for example, if the measurement light beam is simultaneously irradiated toward both the left lens and the right lens of the eyeglass lens, it is not necessary to provide a mechanism for moving the eyeglass lens, which is necessary in a configuration in which the measurement light beam is irradiated toward the left lens and the right lens in turn. Therefore, the measurement optical system can be more easily configured and more simply controlled to obtain the optical characteristics and lens information of the eyeglass lens.

For example, the eyeglass lens measurement device in this embodiment allows the spacing between multiple indices to be set arbitrarily, and displays an index pattern formed by arranging multiple indices with arbitrary spacing on a transmissive display. This makes it possible to obtain an appropriate index pattern image for the eyeglass lens and accurately acquire optical characteristics. Furthermore, even when measuring the optical characteristics of a wide range of eyeglass lenses or when acquiring the distribution of optical characteristics of eyeglass lenses, the optical characteristics can be accurately acquired.

In addition, for example, the eyeglass lens measurement device in this embodiment sets the spacing between the indices that form the index pattern based on the detection results of a detector that detects the measurement light beam from the light source. This allows the spacing between the indices to be set automatically, making it easy to obtain an appropriate index pattern image for the eyeglass lens.

Also, for example, the eyeglass lens measurement device in this embodiment detects an index pattern image in which indices are projected onto the eyeglass lens, and sets the spacing between the multiple indices that form the index pattern based on the detection result of the index pattern image. For example, this makes it possible to appropriately set the spacing between the indices according to the eyeglass lens based on the spacing and shape of the multiple index images in the index pattern image projected onto the eyeglass lens. Also, for example, this makes it possible to obtain an appropriate index pattern image according to the eyeglass lens, and to accurately obtain the optical characteristics of the eyeglass lens.

For example, the eyeglass lens measuring device in this embodiment sets the spacing between the multiple indices that form the index pattern based on whether or not the detection result of the detector exceeds a predetermined threshold. This allows the spacing between the multiple indices to be automatically switched depending on the eyeglass lens, making it easy to obtain an appropriate index pattern image depending on the eyeglass lens, and to accurately obtain the optical characteristics of the eyeglass lens. Note that setting the spacing between the indices in this manner can be particularly effectively used in a fully automated device that automatically performs the measurement of optical characteristics from start to finish after the eyeglass lens is placed.

Furthermore, for example, the eyeglass lens measurement device in this embodiment can set a first interval between the multiple indices forming the index pattern and a second interval between the multiple indices that is different from the first interval. Therefore, at least two intervals between the indices can be used in accordance with various eyeglass lenses.

Furthermore, for example, the eyeglass lens measurement device in this embodiment displays, on the transmissive display, either a first index pattern formed by multiple indices having a first interval, or a second index pattern formed by multiple indices having a second interval, depending on the switched mode. Therefore, for example, it is possible to deal with both eyeglass lenses whose optical characteristics can be obtained with high accuracy by projecting an index pattern having a predetermined index interval, and eyeglass lenses whose optical characteristics are difficult to obtain with high accuracy by projecting an index pattern having a predetermined index interval.

<Example of transformation>
In this embodiment, the measurement optical system 20 is used to measure the optical characteristics of the lens LE that is framed in an eyeglass frame, and to detect the hidden mark image 65. However, the present invention is not limited to this. For example, in this embodiment, the measurement optical system 20 may be used to measure the optical characteristics of an unprocessed lens that is not framed in an eyeglass frame, and to detect the hidden mark image 65. In this case, the lens information of the unprocessed lens may include, in addition to the hidden mark image formed on the unprocessed lens, a marking mark on the unprocessed lens, a print mark on the unprocessed lens, etc.

In this embodiment, the optical characteristics of the lens LE are obtained using a measurement optical system 20 having two transmissive displays (first transmissive display 24a and second transmissive display 24b) arranged at different positions in the optical axis direction, but the present invention is not limited to this. For example, in this embodiment, the optical characteristics of the lens LE may be obtained using a measurement optical system in which one transmissive display is arranged at a predetermined position in the optical axis direction.

Figure 10 shows an example of a measurement optical system with one transmissive display. When using a measurement optical system with one transmissive display, a movement mechanism 28 (e.g., a motor, etc.) may be provided to move the transmissive display 24' in the direction of the optical axis N1. This allows two measurement images to be obtained with different distances from the lens LE to the transmissive display, just like when two transmissive displays are used.

For example, the control unit 70 displays a predetermined index pattern on the transmissive display 24' and places the transmissive display 24' at an initial position T1 close to the lens LE. In this state, a measurement image at the initial position T1 is acquired, including an index pattern image, a left lens image, and a right lens image. Also, for example, the control unit 70 controls the movement mechanism 28 to move the transmissive display 24' by a distance ΔD while keeping the predetermined index pattern displayed on the transmissive display 24', and places the transmissive display 24' at a movement position T2 far from the lens LE. In this state, a measurement image at the movement position T2 is acquired, including an index pattern image, a left lens image, and a right lens image. The control unit 70 can acquire the optical characteristics of the lens LE by determining the position of the focal length f of the lens LE, the position of the optical center O of the lens LE, the refractive power E of the lens LE, and the like, based on these measurement images.

In the above, a moving mechanism 28 is provided for moving the transmissive display 24' in the direction of the optical axis N1, but a moving mechanism for moving the lens LE in the direction of the optical axis N1 may also be provided. This also makes it possible to obtain two measurement images with different distances from the lens LE to the transmissive display, and the optical characteristics of the lens LE can be obtained based on these measurement images.

In the above, a moving mechanism 28 is provided for moving the transmissive display 24' in the direction of the optical axis N1, but the transmissive display 24' may not be moved. In this case, the optical characteristics of the lens LE can be obtained based on the point in the XY direction where the measurement light beam from the light source 21 passes through the lens LE, the point in the XY direction where the measurement light beam passes through the transmissive display 24', and the distance from the lens LE to the transmissive display 24'. For example, the optical characteristics of the lens LE can be obtained by replacing the point P1' of the first transmissive display 24a in FIG. 7 with the point Q1 of the lens LE, replacing the distance ΔD from the first transmissive display 24a to the second transmissive display 24b with the distance from the lens LE to the second transmissive display 24b, and performing the same process.

In this embodiment, the optical path along which the measurement light beam from the light source 21 is guided to the left lens LEl and the right lens LEr is a common optical path, but the present invention is not limited to this. For example, in this embodiment, the optical path along which the measurement light beam from the light source is guided to the left lens LEl and the optical path along which the measurement light beam from the light source is guided to the right lens LEr may be different optical paths.

11 is an example of a configuration in which the measurement light beam from the light source is guided to the left lens LE1 and the measurement light beam is guided to the right lens LEr along different optical paths. The measurement optical system may include a pair of left and right light sources (first light source 211 and second light source 212) and a pair of left and right image pickup elements (first image pickup element 271 and second image pickup element 272). For example, the measurement light beam from the first light source 211 is irradiated to the left lens LE1, and the measurement light beam reflected by the retroreflective member 25 via the left lens LE1 and the transmissive display 24 is imaged by the first image pickup element 271. Also, for example, the measurement light beam from the second light source 212 is irradiated to the right lens LEr, and the measurement light beam reflected by the retroreflective member 25 via the right lens LEr and the transmissive display 24 is imaged by the second image pickup element 272.

For example, in this configuration with a pair of left and right light sources and a pair of left and right image sensors, at least one of the collimator lens, transmissive display 24, retroreflective member 25, etc. may be disposed in each of the left and right optical paths, or may be shared by both the left and right optical paths. As an example, as shown in FIG. 11, collimator lenses (collimator lens 231 and collimator lens 232) may be disposed in each of the left and right optical paths, and the transmissive display 24 and the retroreflective member 25 may be shared by both the left and right optical paths.

For example, by providing a pair of left and right light sources and a pair of left and right collimator lenses, the measurement light beam from the light source 211 passes near the center of the collimator lens 231, and the measurement light beam from the light source 212 passes near the center of the collimator lens 232. This makes it possible to suppress aberrations that occur when the measurement light beam from the light source passes through the collimator lens, and to reduce the impact on measurement accuracy. In addition, because a collimator lens with a small diameter can be used, the measurement optical system can be constructed at low cost.

For example, by providing a pair of left and right imaging elements, the number of pixels of the detector can be effectively used for each of the left lens LEl and the right lens LEr, and the position of the index pattern image (index image) can be detected more accurately, improving the measurement accuracy of the optical characteristics. For example, with a configuration including a pair of left and right imaging elements, it is not necessary to distinguish between the measurement light beam that has passed through the left lens LEl and the measurement light beam that has passed through the right lens LEr, so the optical characteristics and lens information of the lens LE can be obtained with simpler control.

In the above, the measurement optical system 20 is described as having a pair of left and right light sources and a pair of left and right image sensors, but is not limited to this. For example, one light source and a pair of left and right image sensors may be provided. For example, in this case, the measurement light beam irradiated from the light source may be split into an optical path that guides the left lens LEl and an optical path that guides the right lens LEr by a half mirror or the like, and the measurement light beam that passes through each optical path may be imaged by the first image sensor 271 and the second image sensor 272. Also, for example, a pair of left and right light sources and one image sensor may be provided. For example, in this case, the measurement light beam irradiated from the light source 211 and guided to the left lens LEl and the measurement light beam irradiated from the light source 212 and guided to the right lens LEr may be combined by a half mirror or the like and imaged by the image sensor.

In the present embodiment, the optical characteristics of the lens LE are acquired by making the second transmissive display 24b invisible when the first transmissive display 24a is displayed, and by making the second transmissive display 24b visible when the first transmissive display 24a is invisible. However, the present embodiment is not limited to this. For example, the optical characteristics of the lens LE may be acquired by making both the first transmissive display 24a and the second transmissive display 24b visible.

In this case, the measurement light beam from the light source 21 passes through the first transmissive display 24a to form the first index pattern 40a, and then passes through the second transmissive display 24b to form the second index pattern 40b, so that one measurement image including both the first index pattern image 41 and the second index pattern image 51 is acquired. Note that the indices 31 forming the first index pattern 40a and the indices 31 forming the second index pattern 40b may be at least one of different shapes, different positions, and different numbers, so that it is easy to distinguish between the first index pattern image 41 and the second index pattern image 51 in the measurement image.

For example, the control unit 70 can obtain a measurement image M1 including the first index pattern image 41 and a measurement image M2 including the second index pattern image 51 by detecting the first index pattern image 41 and the second index pattern image 51 from one measurement image, similar to when one of two transmissive displays is displayed and the other is not displayed. Based on these measurement images, the control unit 70 can obtain the position of the focal length f of the lens LE, the position of the optical center O of the lens LE, the refractive power E of the lens LE, and the like, thereby acquiring the optical characteristics of the lens LE.

In addition, in this embodiment, the configuration in which the hidden mark image 65 of the lens LE is detected by making both the first transmissive display 24a and the second transmissive display 24b invisible has been described as an example, but the present invention is not limited to this. For example, in this embodiment, the hidden mark image 65 of the lens LE may be detected by making parts of the first transmissive display 24a and the second transmissive display 24b invisible. In this case, it is sufficient that parts of each transmissive display are made invisible so that the first index pattern image 41 and the second index pattern image 51 do not overlap the hidden mark image 65. As an example, the control unit 70 may detect the left lens image and the right lens image 60 from the measurement image, and make the index 31 corresponding to the index image located inside the left lens image and the right lens image 60 invisible to detect the hidden mark image 65 of the lens LE.

In this embodiment, the measurement light beam from the light source 21 is reflected by the retroreflective member 25 to illuminate the lens LE, thereby detecting the hidden mark image 65 on the lens LE, but this is not limited to the above. For example, in this embodiment, a display may be used as the light source, the display may be turned on to illuminate the lens LE, and an irradiation pattern different from the first index pattern 30a and the second index pattern 30b may be displayed on the display to project the irradiation pattern onto the lens LE, thereby detecting the hidden mark image 65 on the lens LE.

Figure 12 shows an example of a configuration using a display 28 as a light source. For example, when using a display 28 as a light source, the light source 28, the first transmissive display 24a, and the second transmissive display 24b may be arranged on the rear side of the lens LE, and the image sensor 27 may be arranged on the front side of the lens LE. The measurement light beam irradiated from the display 28 passes through the two transmissive displays and the lens LE and is imaged by the image sensor 27.

Figure 13 is an example of an irradiation pattern 80 that can be displayed on the display 28. Figure 13(a) is a measurement image M4 when the position of the irradiation pattern 80 displayed on the display 28 is moved. Figure 13(b) is a processed image M5 obtained by processing a plurality of captured images. The irradiation pattern 80 may be any irradiation pattern with different light and dark levels. In Figure 13, a striped irradiation pattern 80 is shown as an example, but a grid pattern irradiation pattern, etc. may also be used.

For example, the control unit 70 displays the irradiation pattern 80 on the display 28 and makes the first transmissive display 24a and the second transmissive display 24b invisible. As a result, the measurement light beam irradiated from the display 28 passes through the two transmissive displays, is refracted by the lens LE, and reaches the image sensor 27. The control unit 70 processes an electrical signal based on the imaging result of the image sensor 27 to obtain a measurement image M4. For example, the measurement light beam irradiated from the display 28 is scattered by a hidden mark formed on the lens LE (or a scratch on the lens LE, etc.), and is not imaged by the image sensor 27. Therefore, in the measurement image M4, the hidden mark image 50 is partially observed in the portion where the irradiation pattern 80 and the hidden mark image 50 overlap. For example, the control unit 70 may control the display of the display 28, move the irradiation pattern 80 by a predetermined pixel position, and obtain a plurality of measurement images M4. Also, for example, the control unit 70 may analyze each of the multiple measurement images M4 to obtain a processed image M5 and detect the entire shape of the hidden mark image 65.

When the display 28 is used as the light source, the display 28 is turned on and the irradiation pattern 80 is not displayed, thereby illuminating the lens LE without projecting the irradiation pattern onto the lens LE. In this state, the display and non-display of the first index pattern 30a on the first transmissive display 24a and the display and non-display of the second index pattern 30b on the second transmissive display 24b may be controlled to determine the optical characteristics of the lens LE based on the respective measurement images.

In addition, when the display 28 is used as the light source, it is possible to use the second transmissive display 24b as the display 28. That is, the first index pattern 30a may be displayed on the first transmissive display 24a to obtain a measurement image M1 including the first index pattern image 41, and the second index pattern 30b may be displayed on the display 28 to obtain a measurement image M2 including the second index pattern image 51. This also makes it possible to determine the optical characteristics of the lens LE.

For example, by using the display 28 as the light source, the lens image and the index pattern image (index image) projected onto the lens LE can be obtained with high contrast, and the detection accuracy of these images can be improved. In a configuration in which the lens LE is illuminated by the retroreflective member 25, the optical path of the measurement light beam irradiated from the light source 21 needs to be branched and guided to the image sensor 27, which reduces the amount of light. However, for example, when the lens LE is illuminated by the display 28, the measurement light path irradiated from the display 28 can be guided to the image sensor 27 without branching, which reduces the reduction in the amount of light and further improves the detection accuracy of these images.

In the present embodiment, the first transmissive display 24a and the second transmissive display 24b are configured to display an index pattern such that the measurement light beam from the light source 21 is blocked by the index 31 and transmits through areas other than the index 31, but this is not limiting. For example, the index pattern may be displayed such that the measurement light beam from the light source 21 transmits through the index 31 and blocks areas other than the index 31. In this case, dust on the lens LE or the transmissive display, uneven reflection due to the retroreflective member 25, etc. are prevented from being reflected in the index pattern, so the pixel position of the index image can be detected with greater accuracy.

In this embodiment, a transmissive display with polarization properties may be used. In this case, the transmissive display may be arranged so that the polarization direction in the lens LE is the Y direction in the measurement device 1. For example, polarized sunglasses only pass light polarized in the up and down directions of the lens (Y direction in the measurement device 1). Therefore, by configuring the transmissive display in this way, even when measuring the optical properties of polarized sunglasses, the measurement light beam that has become polarized by passing through the transmissive display can be efficiently passed through.

In this embodiment, the configuration in which the interval between the indices 31 on the first transmissive display 24a is changed based on the distance K1 between the first index images in the measurement image M1 has been described as an example, but the present invention is not limited to this. In this embodiment, the interval between the indices 31 on the first transmissive display 24a may be changed based on the shape of the first index image in the measurement image M1. For example, the control unit 70 may detect the shape of the first index image by detecting edges from the rise and fall of luminance in the measurement image M1.

For example, the more negative the lens LE is and the higher the optical power, the more the first index image is reduced by the refractive power of the lens LE, and the fewer pixels the image sensor 27 uses to represent each first index image. This causes the first index image in the measurement image M1 to become coarse and the first index image to become deformed. Therefore, the control unit 70 may be configured to use the shape of the first index image in the measurement image M1 to determine whether or not to change the spacing of the indexes 31, and to change the spacing of the indexes 31 when it detects that the first index image has been deformed.

In this embodiment, the interval between the indices 31 on the first transmissive display 24a is changed based on the detection result of the first index image in the measurement image M1 (i.e., the interval between the first index images or the shape of the first index image), but the present invention is not limited to this. In this embodiment, the interval between the indices 31 on the first transmissive display 24a may be changed based on the optical characteristics of the lens LE. In this case, the control unit 70 may first acquire the measurement image M1 regardless of the interval or shape of the first index image in the measurement image M1, and acquire the measurement image M2 regardless of the interval or shape of the second index image in the measurement image M2. The control unit 70 acquires the optical characteristics of the lens LE based on these measurement images M1 and M2. As an example, the refractive power of the lens LE is acquired.

Here, the control unit 70 determines whether the refractive power of the lens LE exceeds a refractive power previously set as a predetermined threshold value. For example, the control unit 70 may determine that the refractive power of the lens LE is less than the predetermined threshold value when the refractive power of the lens LE is smaller than the predetermined threshold value. Also, for example, the control unit 70 may determine that the refractive power of the lens LE exceeds the predetermined threshold value when the refractive power of the lens LE is larger than the predetermined threshold value. For example, when the control unit 70 determines that the refractive power of the lens LE exceeds the predetermined threshold value, the control unit 70 may change the interval between the indexes 31 on the first transmissive display 24a and the second transmissive display 24b, and obtain the measurement image M1 and the measurement image M2 again to obtain the optical characteristics of the lens LE.

For example, in this manner, the eyeglass lens measurement device in this embodiment may calculate the refractive power of the eyeglass lens, and set the spacing between the multiple indices that form the index pattern based on the result of the refractive power calculation. This allows the spacing between the indices to be appropriately set according to the refractive power of the eyeglass lens. This also allows an appropriate index pattern image according to the eyeglass lens to be obtained, and the optical characteristics of the eyeglass lens to be obtained with high accuracy.

In this embodiment, the interval between the indices 31 on the first transmissive display 24a may be changed based on the type of lens LE. In this case, the control unit 70 acquires the measurement image M1 regardless of the interval or shape of the first index image in the measurement image M1. For example, the control unit 70 compares the reference image B1 with the measurement image M1, and determines the type of lens LE based on the change in the first index image in the measurement image M1 relative to the index image in the reference image B1. As an example, the control unit 70 may determine that the lens LE is a minus lens when the first index image in the measurement image M1 is reduced relative to the index image in the reference image B1. As an example, the control unit 70 may determine that the lens LE is a plus lens when the first index image in the measurement image M1 is enlarged relative to the index image in the reference image B1.

For example, when the control unit 70 determines that the lens LE is a minus lens, the control unit 70 may change the interval between the indices 31 on the first transmissive display 24a and the second transmissive display 24b. For example, the control unit 70 may change the interval between the indices 31 on the first transmissive display 24a and the second transmissive display 24b to be wider. This may result in the acquisition of measurement images M1 and M2, and the acquisition of the optical characteristics of the lens LE. Also, for example, when the control unit 70 determines that the lens LE is a plus lens, the control unit 70 may change the interval between the indices 31 on the first transmissive display 24a and the second transmissive display 24b. For example, the control unit 70 may change the interval between the indices 31 on the first transmissive display 24a and the second transmissive display 24b to be narrower. This may result in the acquisition of measurement images M1 and M2, and the acquisition of the optical characteristics of the lens LE.

For example, in this manner, the eyeglass lens measurement device in this embodiment may determine whether the eyeglass lens is a minus lens or a plus lens, and set the spacing between multiple indices forming the index pattern based on the determination result. This allows the spacing between the indices to be appropriately set according to the type of eyeglass lens. This also allows an appropriate index pattern image according to the eyeglass lens to be obtained, and the optical characteristics of the eyeglass lens to be obtained with high accuracy.

In this embodiment, a predetermined threshold value is set for changing the interval between the indices 31 on the first transmissive display 24a, and the interval between the indices 31 is changed when the predetermined threshold value is exceeded. However, the present embodiment is not limited to this. For example, in this embodiment, the interval between the indices 31 may be changed using a table or the like that associates the imaging result detected by the imaging element with the interval between the indices 31 displayed on the first transmissive display 24a. In other words, the interval between the indices 31 may be changed according to the detection result detected by the imaging element. For example, the table may be set in advance based on the results of experiments or simulations.

In this embodiment, the normal mode and the wide interval mode are switched based on the distance K1 between the first index images when the lens LE is a minus lens, but the present invention is not limited to this. For example, in this embodiment, the normal mode and the narrow interval mode may be switched based on the distance K1 between the first index images when the lens LE is a plus lens. For example, in the narrow interval mode, a voltage may be applied to every third segment that displays the multiple indexes 31, and the first index pattern 30a in which the distance between the multiple indexes 31 is shorter than the predetermined distance S1 may be displayed on the first transmissive display 24a. Of course, in this embodiment, the normal mode, the wide interval mode, and the narrow interval mode may be provided, and one of these modes may be switched and applied based on the distance K1 between the first index images.

REFERENCE SIGNS LIST 1 eyeglass lens measuring device 10 eyeglass support unit 20 measuring optical system 21 light source 24 transmissive display 26 retroreflective member 27 imaging element 70 control unit 75 memory

Claims (5)

A spectacle lens measuring device for measuring a spectacle lens, comprising:
a light source that irradiates a measurement light beam toward the eyeglass lens;
a transmissive display that transmits the measurement light beam from the light source and is capable of displaying an index pattern formed by arranging a plurality of indices;
A display control means for controlling the display of the index pattern;
a detector for detecting the measurement light beam passing through the eyeglass lens and the transmissive display;
an optical characteristic acquisition means for acquiring optical characteristics of the eyeglass lens based on a detection result of the detector;
a lens information acquisition means for acquiring lens information different from the optical characteristics of the eyeglass lens based on a detection result of the detector;
Equipped with
the transmissive display includes a first transmissive display capable of displaying a first index pattern, and a second transmissive display capable of displaying a second index pattern, the second transmissive display being disposed at a position different from that of the first transmissive display in the optical axis direction;
the detector detects the measurement beam that has been transmitted through the first transmissive display and then through the second transmissive display;
The optical characteristic acquisition means acquires the optical characteristics by causing the display control means to display the index pattern, and the lens information acquisition means acquires the lens information by causing the display control means to hide at least a portion of the index pattern. 2. The eyeglass lens measuring device according to claim 1,
the display control means controls the display of the first indicator pattern and the display of the second indicator pattern,
A spectacle lens measurement device characterized in that when the first index pattern is displayed, at least a portion of the second index pattern is hidden, and when at least a portion of the first index pattern is hidden, the second index pattern is displayed. 3. The eyeglass lens measuring device according to claim 1,
The spectacle lens measurement device is characterized in that the transmissive display serves both as a left lens transmissive display that displays the index pattern and projects an index pattern image onto the left lens of the spectacle lens, and as a right lens transmissive display that displays the index pattern and projects an index pattern image onto the right lens of the spectacle lens. In the eyeglass lens measurement device according to any one of claims 1 to 3,
The light source is a display capable of irradiating the measurement light beam toward the eyeglass lens and illuminating the eyeglass lens,
The spectacle lens measuring device according to claim 1, wherein the detector detects the measurement light beam from the display. In the eyeglass lens measurement device according to any one of claims 1 to 3,
a retroreflective member capable of illuminating the eyeglass lens by reflecting the measurement light beam, which is irradiated from the light source toward the eyeglass lens and passes through the eyeglass lens and the transmissive display, back in an incident direction;
The spectacle lens measuring device according to claim 1, wherein the detector detects a reflected light beam that is a result of the measurement light beam being reflected by the retroreflective member.

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