JP7373378B2 - lens measuring device - Google Patents

Description

The present disclosure relates to a lens measurement device.

Some lens measuring devices calculate optical characteristic values such as spherical power, cylindrical power (astigmatic power), cylindrical axis angle (astigmatic axis angle), and prism value (prism power and prism base direction) of a test lens.

It has been proposed that a lens measuring device calculates optical characteristic values in a predetermined range of a test lens and displays a mapping image showing the distribution of the optical characteristic values according to the size of the test lens (for example, , see Patent Document 1). This lens measuring device can grasp the distribution of optical characteristic values by superimposing the lens to be tested on the displayed mapping image.

Japanese Patent Application Publication No. 2006-105868

By the way, optical characteristic values at predetermined feature points of a lens to be tested may be determined. However, although the above-mentioned lens measuring device can grasp the distribution of optical characteristic values in a test lens using a mapping image, it is difficult to grasp the optical characteristic values of feature points.

The present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide a lens measuring device that can determine the optical characteristic value of a predetermined feature point in a lens to be tested.

In order to solve the above-mentioned problems, the lens measurement device of the present disclosure includes a light projection optical system that projects measurement light onto the test lens, and a light reception optical system that receives the measurement light that has passed through the test lens. , an optical property calculation unit that calculates an optical property value of the test lens based on the measurement light received by the light receiving optical system, a feature point detection unit that detects a feature point on the test lens, and the optical property. A feature point characteristic extraction section that extracts an optical characteristic value at the feature point from the calculation result by the calculation section, and an optical characteristic output section that outputs the optical characteristic value of the feature point determined by the feature point characteristic extraction section. It is characterized by

According to the lens measuring device of the present disclosure, it is possible to grasp the optical characteristic value of a predetermined feature point on a lens to be tested.

1 is an explanatory diagram showing the overall configuration of a lens measuring device according to a first embodiment as an example of a lens measuring device according to the present disclosure; FIG. FIG. 2 is an explanatory diagram showing the configuration of a measurement optical system of the lens measurement device. FIG. 2 is an explanatory diagram showing the configuration of a Hartmann plate as an example of a pattern plate of the measurement optical system. FIG. 2 is a block diagram showing the configuration of a control system of the lens measuring device. FIG. 2 is an explanatory diagram showing an example of an image in which a feature point index is superimposed on a superimposed image of a lens image and a mapping image. 3 is a flowchart showing a measurement control process (measurement control method) executed by a control unit of the lens measurement device.

Example 1 of a lens measuring device 10 as an embodiment of the lens measuring device according to the present disclosure will be described below with reference to FIGS. 1 to 6. In addition, in FIG. 5, the superimposed image Is actually shows an image of the glasses G, but for easy understanding, the glasses G, the glasses frame F, the nose pad Np, and the framed lens Lf are shown. A symbol is attached.

The lens measurement device 10 measures the optical characteristics of the lens L to be tested and calculates optical measurement values, and in the first embodiment, can be displayed as a mapping image Im showing the distribution of the calculated optical measurement values. The lens L to be tested may be a circular unprocessed lens, a ground lens for eyeglasses, a framed lens Lf that is fixed (attached) to the eyeglass frame F and configured as eyeglasses G, etc. used. The eyeglass frames F include two-point frames and rimless frames made of nylon thread or the like. As shown in FIG. 1, the lens measuring device 10 includes a device main body 11, a display section 12, a lens holding mechanism 13, and an imaging section 14.

The device main body 11 is box-shaped as a whole. In the apparatus main body 11, an upper housing part 11a and a lower housing part 11b are vertically arranged with a space between them, and a lens set space 15 is provided at an intermediate position. The upper housing part 11a houses the light projecting optical system 20, the lower housing part 11b houses the light receiving optical system 30, and the lens set space 15 allows placement of the lens L to be tested. . In the lens measuring device 10, a light projecting optical system 20 projects measurement light toward a test lens L placed in a lens set space 15, and a light receiving optical system 30 receives the measurement light transmitted through the test lens L. By receiving the light, the optical characteristics of the lens L to be tested are measured. The light projecting optical system 20 and the light receiving optical system 30 are the measuring optical system Om in the lens measuring device 10, and the configuration thereof will be described later.

The display section 12 is provided at the upper front surface of the upper accommodating section 11a of the apparatus main body 11. The display unit 12 has a display screen 12a configured with a liquid crystal display, an organic EL display, or the like, and in the first embodiment, the display screen 12a is of a touch panel type. The display unit 12 (display screen 12a) displays optical characteristic values (spherical power, cylindrical power, cylinder axis angle, prism power, prism base direction, etc.), a mapping image Im representing the distribution of optical characteristic values of the lens L to be tested, etc. are displayed. Further, the display unit 12 can display optical characteristic values of the feature points Pf (a feature point characteristic column Cc indicating the optical characteristic values), which will be described later. Therefore, the display unit 12 functions as an example of an optical property output unit that outputs the optical property value of the feature point Pf.

Since the display screen 12a of the first embodiment is of a touch panel type, it also has the function of the operation section 16 for performing operations in the lens measuring device 10. The operation unit 16 is used to perform operations such as switching the measurement mode, starting and stopping measurement, and various settings for measurement, display, and others, and is displayed as an icon indicating each operation. Note that the operation unit 16 may be configured with buttons and switches provided around the display screen 12a, or may be configured as an input device such as a keyboard, mouse, or control lever, or may have other configurations. but not limited to.

The lens holding mechanism 13 is provided in the lens set space 15. The lens holding mechanism 13 includes a lens holding member 13a, a support pin 13b, a nosepiece support member 13c, and a lens table 13d. The lens holding member 13a is rotatable by a drive mechanism between an upper comparison position and a lower holding position, and can hold the test lens L from above. The support pin 13b supports the test lens L from below. The lower end of the support pin 13b is connected to a Hartmann plate 31 (see FIG. 2), which will be described later, and maintains a constant distance between the lens L to be tested and the Hartmann plate 31. The lens pressing member 13a and the support pin 13b are provided in pairs on the left and right, and can accommodate a pair of left and right framed lenses Lf that are framed in the eyeglass frame F.

The nosepiece support member 13c has a cylindrical curved surface that is curved to match the size of a standard nose, and is provided so as to be movable in the horizontal direction. When the nose pad Np of the eyeglass frame F is placed on the nose pad support member 13c, the nose pad support member 13c fixes the eyeglass frame F by fitting into the nose pad Np. The lens table 13d is movable in the front-rear direction within the lens set space 15 by a drive mechanism, and when it comes into contact with the double-framed lenses Lf in the spectacle frame F fixed by the nosepiece support member 13c, the lens table 13d The posture of the frame F is determined to assist in positioning both lenses L to be tested within the lens set space 15.

When the lens L to be tested is placed on the support pin 13b and a starting operation is performed on the operation unit 16, the lens holding mechanism 13 rotates the lens holding member 13a downward and holds the lens L on the support pin 13b. The upper test lens L is held down by the lens holding member 13a. Further, in the case where the lens L to be tested is a framed lens Lf, the lens holding mechanism 13 is arranged such that the pair of framed lenses Lf are placed on the pair of support pins 13b while the nose pad Np is fitted into the nose pad support member 13c. In this state, each framed lens Lf is held down by the lens holding member 13a. Then, the lens holding mechanism 13 moves the lens table 13d to set the test lens L (framed lens Lf) (the position of the test lens L with respect to the measurement optical axis Lm of the measurement optical system Om, which will be described later). automatically adjust.

The lens holding mechanism 13 of Example 1 is provided with a nose rest position sensor 13e and a table position sensor 13f (see FIG. 4). The nose-piece position sensor 13e detects the horizontal position of the nose-piece support member 13c, and the table position sensor 13f detects the longitudinal position of the lens table 13d. The nose rest position sensor 13e and the table position sensor 13f can be configured with potentiometers or the like, and each outputs information on the detected positions of the nose rest support member 13c and the lens table 13d to a feature point detection section 57, which will be described later.

In the lens measuring device 10, a marking device may be provided in the lens set space 15 to mark the test lens L held by the lens holding mechanism 13.

[Optical system configuration]
Next, the configuration of the measurement optical system Om in the lens measurement device 10 will be explained using FIGS. 2 and 3. FIG. 2 shows a state in which a pair of framed lenses Lf are held by the lens holding mechanism 13 and can be measured. The measurement optical system Om is for measuring the optical characteristic value of the lens L to be tested, and includes a light projecting optical system 20 and a light receiving optical system 30. Further, the lens measuring device 10 of this first embodiment has a pair of measurement optical systems Om, and when a framed lens Lf is used as the lens L to be tested, it is possible to simultaneously measure the left and right framed lenses Lf. It becomes.

The light projection optical system 20 is an optical system that projects measurement light onto the lens L to be tested. The light projection optical system 20 includes a light source 21 and a collimator lens 22, which are provided on the measurement optical axis Lm of the measurement optical system Om. The light source 21 emits measurement light, and in the first embodiment, an LED (light emitting diode) is used. The collimator lens 22 converts the measurement light from the light source 21 into parallel light and projects it onto the lens L to be tested. The light projection optical system 20 includes mirrors on the optical path from the light source 21 to the collimator lens 22 and from the collimator lens 22 to the test lens L, and reflects the measurement light with the mirror to change the optical path. It may also be configured to be folded. With such a configuration, the lens measuring device 10 can be downsized.

The light receiving optical system 30 is an optical system that receives the measurement light that is projected by the light projecting optical system 20 and passes through the test lens L. The light receiving optical system 30 includes a Hartmann plate 31, a screen 32, a field lens 33, an imaging lens 34, and a measurement light receiving element 35, which are provided on the measurement optical axis Lm of the measurement optical system Om. The screen 32 and the measurement light receiving element 35 are arranged at positions that are optically conjugate to each other.

The Hartmann plate 31 is a pattern plate that separates the measurement light that has passed through the test lens L into a plurality of divided measurement light beams. As shown in FIG. 3, this Hartmann plate 31 has a large number of circular openings 31a arranged vertically and horizontally (two-dimensionally) at equal intervals. The openings 31a only have to be spaced appropriately, and in the first embodiment, they are arranged vertically and horizontally at intervals of 2 millimeters. The measurement light that has passed through the test lens L is separated (converted) into a plurality of divided measurement light beams by passing through each opening 31a of the Hartmann plate 31. Note that the Hartmann plate 31 may have any other configuration as long as it is a pattern plate that separates the measurement light that has passed through the test lens L into a plurality of divided measurement light beams in order to enable calculation of the optical characteristics of the test lens L. However, the configuration is not limited to the configuration of the first embodiment.

As shown in FIG. 2, a plurality of divided measurement light beams separated by each opening 31a of the Hartmann plate 31 are projected onto the screen 32. The projection position and shape of each of the plurality of divided measurement light beams on the screen 32 is displaced according to the optical characteristic value of the lens L to be tested. Therefore, the projection pattern formed by each divided measurement light beam is reduced, enlarged, or distorted on the screen 32 depending on the optical characteristic value of the lens L to be tested. Each of the divided measurement light beams projected onto the screen 32 passes through a field lens 33 and an imaging lens 34, and is imaged onto a measurement light receiving element 35 arranged conjugately with the screen 32. Therefore, the field lens 33 and the imaging lens 34 function as an imaging optical system that images each divided measurement light flux of the screen 32 onto the measurement light receiving element 35.

The measurement light-receiving element 35 receives each divided measurement light beam, converts it into an electric signal (image signal), and outputs it, and in the first embodiment, it is constituted by a CCD (Charge Coupled Device). The image signal output from the measuring light receiving element 35 includes information indicating the light receiving position and the shape of the received light image for each of the divided measurement light beams. This information is expressed as the position (coordinates) of each pixel of the measurement light receiving element 35.

In the light receiving optical system 30, two-dimensional coordinates are defined on the Hartmann plate 31. The origin of the two-dimensional coordinates can be set at any position, such as the measurement optical axis Lm of the measurement optical system Om (see FIG. 2), the center of the Hartmann plate 31, or one vertex thereof. In addition, in the light receiving optical system 30, the coordinates similar to the coordinates on the Hartmann plate 31 are on the screen 32, the back surface of the test lens L held by the lens holding mechanism 13 (the surface in contact with the support pin 13b), Similar coordinates are defined on the light receiving surface of the measuring light receiving element 35. These defined coordinates become the coordinates in the light receiving optical system 30, and become the measurement range of the measurement optical system Om.

[Detailed configuration of imaging unit]
The imaging unit 14 is arranged between the pair of light projecting optical systems 20 in the upper housing part 11a of the apparatus main body 11. The imaging unit 14 images the test lens L held by the lens holding mechanism 13 in a direction parallel to the measurement optical axis Lm of each light projection optical system 20. The imaging unit 14 of the first embodiment is capable of simultaneously imaging the entirety of the pair of left and right framed lenses Lf as the test lens L held by the lens holding mechanism 13. The imaging unit 14 is, for example, a monocular digital camera, and includes an imaging optical system 41 and an imaging element 42 .

The imaging optical system 41 is composed of a plurality of lenses, and forms a subject image of the test lens L held by the lens holding mechanism 13 (including the case of a pair of framed lenses Lf) on the imaging element 42. The image sensor 42 converts the subject image formed by the imaging optical system 41 into an electrical signal (image signal) and outputs the electrical signal.

[Detailed configuration of control system]
Next, the configuration of the control system of the lens measuring device 10 will be explained using FIG. 4. The lens measuring device 10 includes a CPU (Central Processing Unit) 50 and a storage section 51. The storage unit 51 is configured with a ROM (Read Only Memory), an HDD (Hard Disk Drive), an EEPROM (Electrically Erasable Programmable ROM), etc., and stores necessary control programs.

The CPU 50 controls the operation of each part of the lens measuring device 10 and calculates optical characteristic values by loading the control program stored in the storage unit 51 onto an internal memory configured by, for example, RAM (Random Access Memory). etc. Based on this control program, the CPU 50 performs a control section 52, an optical property calculation section 53, a mapping formation section 54, a lens image acquisition section 55, a superimposed image generation section 56, a feature point detection section 57, a feature point characteristic extraction section 58, and an image control section. It operates as a section 59, an error calculation section 61, and an error discrimination section 62.

The control section 52 centrally controls the operation of each section of the lens measuring device 10. The control unit 52 controls, for example, the control processing of turning on and off the light source 21 of the light projecting optical system 20, the control processing of the operation of exchanging signals in each of the above-mentioned parts (numerals 53 to 59, 61, and 62), and the measurement light receiving element. 35, an image signal from the image sensor 42, a mapping image Im from the mapping forming section 54, an optical characteristic value from the feature point characteristic extraction section 58, a superimposed image Is from the image control section 59, etc. Performs storage processing and read processing, etc.

The optical characteristic calculation unit 53 analyzes the size change due to reduction or enlargement and the shape change due to distortion in the projection pattern of each divided measurement light beam based on the image signal input from the measurement light receiving element 35. By doing so, the process of calculating the optical characteristic value of the lens L to be tested is performed. The optical characteristic values include the spherical power, cylindrical power, cylindrical axis angle, prism power, prism base direction, etc. of each part of the lens L to be tested. For this calculation, in the lens measurement device 10, each divided measurement light beam that has passed through the Hartmann plate 31 is measured on the screen 32 or on the measurement light receiving element 35 (its light receiving surface) in a state where the test lens L is not placed. Reference data such as data indicating the light receiving position (coordinates) and data indicating the shape of the light receiving image (light receiving point) is prepared in advance. This reference data is stored in a control program within the storage unit 51, for example.

When the test lens L is measured, the optical characteristic calculation unit 53 analyzes and acquires the light receiving position and the shape of the received light image of each divided measurement light beam based on the image signal from the measurement light receiving element 35, and calculates the shape of the received light image. By comparing the analysis results with reference data, optical characteristic values of each part of the lens L to be tested are calculated. Thereby, the optical characteristic calculation unit 53 calculates optical characteristic values at all positions within the measurement range of the measurement optical system Om on the lens L to be tested. Since the calculation of this optical characteristic value is the same as the conventional method, detailed explanation will be omitted. The optical property calculation unit 53 outputs numerical data of the calculated optical measurement values to the mapping formation unit 54, feature point property extraction unit 58, and image control unit 59.

The mapping forming unit 54 performs processing to form a mapping image Im (see FIG. 5) representing the distribution of optical characteristic values of the lens L to be tested. The mapping forming unit 54 connects the positions having the same optical characteristic value among the optical characteristic values of each position (coordinate) of the test lens L calculated by the optical characteristic calculating unit 53 by a constant power line like a contour line. Then, a mapping image Im representing the distribution of optical characteristic values of the lens L to be tested is formed. Note that FIG. 5 shows a composite map showing the distribution of spherical power (S) and cylindrical power (C) as an example of the mapping image Im. The mapping forming section 54 outputs the image data of the formed mapping image Im to the superimposed image generating section 56.

The lens image acquisition unit 55 acquires an image of the test lens L captured by the imaging unit 14 from an imaging signal input from the imaging device 42 of the imaging unit 14, that is, from a subject image photoelectrically converted by the imaging device 42. . Although the lens image acquisition unit 55 of the first embodiment acquires an image of the lens L to be tested as a still image, it may be a moving image. The lens image acquisition unit 55 performs necessary processing such as coordinate transformation, contrast adjustment, color conversion (semi-transparent or sepia color, etc.), brightness adjustment, filter processing, etc. on the acquired image of the lens L to be tested. Let it be a lens image Ir that has been processed. The necessary processing and processing may include processing to make the lens image Ir less conspicuous than the mapping image Im. The lens image acquisition unit 55 outputs the acquired lens image Ir (its image data) to the superimposed image generation unit 56.

The superimposed image generation unit 56 superimposes the mapping image Im formed by the mapping formation unit 54 and the lens image Ir acquired by the lens image acquisition unit 55 to generate a superimposed image Is. At this time, the superimposed image generation unit 56 makes the magnification of the mapping image Im for the lens L to be tested match the magnification of the lens image Ir for the lens L to be tested. Further, the superimposed image generation unit 56 sets an in-map reference position in the mapping image Im and also sets an in-imaging reference position in the lens image Ir, so that the mapping image is created so that both reference positions have a preset positional relationship. The arrangement (position, orientation, etc.) of Im is determined, and the mapping image Im is superimposed on the lens image Ir in the determined arrangement. The superimposed image generation unit 56 of the first embodiment calculates the coordinates of the light-receiving optical system 30 (coordinates defined on the Hartmann plate 31, the light-receiving surface of the measurement light-receiving element 35, etc.) and the imaging optical axis of the imaging unit 14. By using the positional relationship, the superimposed image Is is generated with both reference positions having a preset positional relationship. The positional relationship between the coordinates of the light-receiving optical system 30 and the photographing optical axis of the imaging section 14 can be obtained from the initial settings in the lens measuring device 10. Therefore, in the superimposed image Is, it is possible to easily understand which position on the mapping image Im a given position on the lens image Ir corresponds to, and the optical characteristics at the corresponding position can be determined from the mapping image Im. By acquiring the value, it is possible to acquire the optical characteristic value at any position on the lens image Ir.

Here, the superimposed image generation unit 56 processes both the mapping image Im and the lens image Ir to be semi-transparent, and superimposes the semi-transparent mapping image Im and the lens image Ir to create an area where both are superimposed. A superimposed image Is in which both images are visible is generated. Further, the superimposed image generation unit 56 processes either the mapping image Im or the lens image Ir to be semitransparent, so that when superimposing the mapping image Im and the lens image Ir, the semitransparent image is located in the front. By superimposing them, a superimposed image Is in which both images can be visually viewed may be generated. FIG. 5 shows a superimposed image Is as the above-mentioned composite map, and shows an example in which a mapping image Im is superimposed on a part of the area inside the lens L to be tested in the lens image Ir.

The feature point detection unit 57 detects feature points Pf on the lens L to be tested. The feature point Pf is an optically characteristic location on the lens L to be tested or a location where an index is formed on the lens L to be tested. Its optically characteristic points include the rear apex, the front apex, the distance power measurement position (F point), the near vision power measurement position (N point), the distance point, the near point, and the center line of the progressive zone. , progressive band length, geometric optical center, prism measurement point, eye point, etc. In addition, the index may be a mark drawn directly on, engraved with, or affixed to the test lens L, such as a mark using mark ink, a magic mark indicating the eye point, or a paint mark, or a mark drawn directly on the test lens L, Examples include hidden marks placed on Which of the above-mentioned feature points Pf is targeted may be set in advance, or may be set by operating the operation unit 16. The feature point detection unit 57 detects feature points Pf on the lens L to be tested by detecting these optically characteristic locations and indicators according to the set target. This feature point Pf can be detected by various methods, and the first embodiment exemplifies three methods.

The first method is to detect the outer periphery Op (contour) of the test lens L in the lens image Ir acquired by the lens image acquisition unit 55, and detect feature points Pf based on the outer periphery Op. That is, the feature point detection unit 57 detects the coordinates of the outer peripheral edge Op of the test lens L on the lens image Ir by analyzing the lens image Ir. Then, the feature point detection unit 57 sets a position having a predetermined positional relationship with the detected outer peripheral edge Op (its coordinates) as a feature point Pf. For example, when the test lens L is in use, the feature point detection unit 57 detects the feature point at a predetermined distance in the horizontal direction from the inner end of the outer peripheral edge Op and at a predetermined distance in the vertical direction from the lower end of the outer peripheral edge Op. Let the coordinates of the position corresponding to the distance be the feature point Pf. This predetermined distance is appropriately set based on an average value or the like depending on the type of optically characteristic location that is intended to be the feature point Pf.

The second method is to detect an index of the lens L to be tested in the lens image Ir acquired by the lens image acquisition unit 55, and use the index as a feature point Pf. That is, the feature point detection unit 57 analyzes the lens image Ir to detect an index provided on the lens L to be tested, and sets the position of the index as a feature point Pf. At this time, if the index is difficult to detect because it is engraved, pasted, hidden, etc., the feature point detection unit 57 detects a lens image obtained by irradiating light from various directions onto the lens L to be tested. By having the lens image acquisition unit 55 acquire Ir, it is possible to easily detect the index.

The third method detects feature points Pf based on the holding position by the lens holding mechanism 13. That is, the feature point detection unit 57 calculates a position that is a predetermined distance from the position of the nosepiece support member 13c in the lens holding mechanism 13 in the horizontal direction based on the interpupillary distance (which may be an average value or an actual measured value). , a position that is a predetermined distance in the vertical direction from the position of the lens table 13d to the lower end of the outer peripheral edge Op of the lens L to be tested in the fixed eyeglass frame F is calculated. The positions of the nose pad support member 13c and the lens table 13d can be acquired from the nose pad position sensor 13e and the table position sensor 13f. Further, in the lens measuring device 10, the positional relationship of the imaging optical axis of the imaging unit 14 with respect to the reference positions of the nosepiece support member 13c and the lens table 13d in the lens holding mechanism 13 can be acquired from the initial setting. As a result, the feature point detection unit 57 detects the calculated position at a predetermined distance in the horizontal and vertical directions as a feature point Pf in the lens image Ir. The predetermined distance at this time can be the same as in the first method.

The feature point detection section 57 detects the feature point Pf as described above, and outputs the coordinates (its data) of the feature point Pf to the feature point characteristic extraction section 58. Here, the feature point detection unit 57 can detect a plurality of feature points Pf because various points can be set as the feature points Pf as described above. For example, the feature point detection unit 57 uses the first or third method to detect a predetermined position as the first feature point Pf1, and also detects a predetermined position as the first feature point Pf1 based on the lens image Ir. It is determined whether or not the test lens L is provided with an index, and if it is determined that the index is provided, the coordinates of the index on the lens image Ir are detected using the second method, and the second It may be set as the feature point Pf2 (see FIG. 5). The number of feature points Pf to be detected may be set in advance, or may be set by operating the operation unit 16.

The feature point characteristic extraction section 58 extracts the optical characteristic value of the test lens L at the feature point Pf detected by the feature point detection section 57 from the numerical data of the optical measurement value calculated by the optical characteristic calculation section 53. The feature point characteristic extraction unit 58 acquires the coordinates of the feature point Pf on the lens image Ir from the feature point detection unit 57, acquires the corresponding coordinates on the superimposed image Is, that is, the mapping image Im, from the coordinates, and extracts the corresponding coordinates on the superimposed image Is, that is, the mapping image Im. By calculating the optical characteristic value at the coordinate position corresponding to the feature point Pf on the Hartmann plate 31 using the numerical data from the optical property calculating section 53, the optical characteristic value at the feature point Pf is extracted.

The feature point characteristic extraction unit 58 extracts the optical characteristic values (spherical power, cylindrical power, cylindrical axis angle, prism power, prism base direction, etc.) at the feature point Pf of the test lens L and the optical characteristic values of the prescription. The difference (hereinafter referred to as optical characteristic shift amount) may be determined. This prescription is for a test lens L that can appropriately correct the visual acuity of a glasses wearer, and includes optical characteristic values at specific feature points Pf. Therefore, when the lens L to be tested (framed lens Lf) is appropriately formed, each of the optical characteristic deviation amounts becomes 0 (zero). In other words, the presence or absence of the amount of deviation in optical characteristics or its magnitude can be used as a basis for determining whether or not the lens L to be tested (framed lens Lf) is appropriate, and the degree of appropriateness thereof.

The image control section 59 performs control to display various images on the display section 12 (its display screen 12a). The image control unit 59 is previously provided with information that associates the coordinates on the light-receiving surface of the image sensor 42 with the coordinates on the display screen 12a of the display unit 12, and based on this information, displays the light-received image by the image sensor 42 on the display unit. 12. As one example, the image control unit 59 causes the display unit 12 to display the superimposed image Is (see FIG. 5) generated by the superimposed image generation unit 56. As shown in FIG. 5, the image control unit 59 of the first embodiment causes the display unit 12 to display the feature point characteristic field Cc superimposed on the superimposed image Is. This feature point characteristic column Cc indicates the optical characteristic value at the feature point Pf detected by the feature point detection unit 57, and in the example of FIG. The power (C), cylinder axis angle (A), prism power (P), and addition power (ADD) are shown numerically.

Further, the image control unit 59 can superimpose a feature point index m indicating the position of the feature point Pf on the superimposed image Is. If a plurality of feature points Pf are set to be detected, this feature point index m is superimposed on each position. For example, in the case of the setting to detect the first feature point Pf1 and the second feature point Pf2 as described above, as shown in FIG. A superimposed image Is in which the index m1 and the second feature point index m2 corresponding to the second feature point Pf2 are superimposed is displayed on the display unit 12. The superimposed image Is shown in FIG. 5 includes a first feature point index m1 indicating the coordinate position of the first feature point Pf1 as a distance power measurement position, and a magic marker indicating the distance eye point of an actual glasses wearer. A second feature point index m2 indicating the coordinate position of the mark (index) is superimposed.

In addition, when the feature point characteristic extraction unit 58 calculates the amount of deviation in optical properties as described above, the image control unit 59 may display the amount of deviation in optical properties together with the optical property value of the feature point Pf. good. This optical characteristic deviation amount may be displayed within the above-mentioned feature point characteristic column Cc, or may be displayed separately from it.

The error calculation unit 61 calculates a relative prism error Ep that is the difference between the optical characteristic values at the same predetermined position (eg, feature point Pf) of the left and right framed lenses Lf (tested lens L) fixed to the eyeglass frame F. The error calculation unit 61 of the first embodiment calculates the difference between the prism values (optical characteristic values) of the feature points Pf of the left framed lens Lf and the right framed lens Lf, respectively, between the horizontal component and the vertical component. The calculated result is defined as the relative prism error Ep. Thereby, the error calculation unit 61 can calculate the relative prism error Ep between the horizontal component and the vertical component in the left and right framed lenses Lf. The error calculation unit 61 outputs the calculated relative prism error Ep to the error determination unit 62 and the image control unit 59 as appropriate.

The error determining unit 62 determines whether the relative prism error Ep calculated by the error calculating unit 61 is within the allowable range Lt. The allowable range Lt is set in a plurality of stages depending on the larger prism value of the horizontal component and the vertical component prism value at the feature point Pf. Further, the allowable range Lt is set in a plurality of stages depending on the magnitude of the refractive power (its value) at the feature point Pf in each of the horizontal component and the vertical component. In other words, it is assumed that the allowable range Lt is divided into three stages depending on the prism value, and into two stages depending on the magnitude of refractive power for each of the horizontal and vertical components. , 12 values are set. The allowable range Lt may be set as appropriate, such as the number of cases, numerical values, types of optical characteristics used for the cases, etc. that are determined by various standards.

The error determination unit 62 selects the one that matches the optical characteristic value at the feature point Pf from the tolerance range Lt set as described above, and applies the relative value calculated by the error calculation unit 61 within the selected tolerance range Lt. It is determined whether there is a prism error Ep. Then, the error determination section 62 outputs the determination result to the image control section 59.

The image control unit 59 of the first embodiment can display the error determination column Ce (see FIG. 5) superimposed on the superimposed image Is. This error determination column Ce indicates whether or not the determination result by the error determination unit 62, that is, the relative prism error Ep, which is the difference between the optical characteristic values of the feature point Pf, is within the allowable range Lt. The error determination column Ce in the example of FIG. 5 displays the relative prism error Ep calculated by the error calculation unit 61 in addition to the determination result.

[Measurement control processing configuration]
Next, a measurement control process (measurement control method) as an example of measuring the lens L to be tested using the lens measuring device 10 will be described using FIG. 6. This measurement control process is executed by the control unit 52 based on a program stored in the storage unit 51. Each step (each process) of the flowchart of FIG. 6 will be explained below. The flowchart in FIG. 6 shows a case where the lenses L to be measured are a pair of framed lenses Lf fixed to an eyeglass frame F and formed as eyeglasses G, and the relative prism error Ep is within the allowable range Lt. It is also determined whether the value is within the range. The flowchart in FIG. 6 shows that the lens measurement device 10 is started, the browser or application is launched, the display unit 12 is displayed, and the glasses G (glasses frame F) are held in the lens holding mechanism 13 and the operation unit 16 is pressed. The measurement starts when an operation to start the measurement is performed.

In step S1, optical measurement of the framed lens Lf (tested lens L) is performed, and the process proceeds to step S2. In this step S1, measurement light is projected from the light projection optical system 20 (its light source 21) toward the framed lens Lf, and an image of the measurement light that has passed through the framed lens Lf is captured by the light receiving optical system 30 (its light source 21). It is acquired by the light receiving element 35).

In step S2, the pair of framed lenses Lf is imaged, and the process proceeds to step S3. In this step S2, the imaging unit 14 images the pair of framed lenses Lf held by the lens holding mechanism 13. Note that step S2 may be performed after step S3, and is not limited to the order of the first embodiment.

In step S3, the optical characteristic value of each framed lens Lf is calculated, and the process proceeds to step S4. In this step S3, the optical characteristic calculation unit 53 calculates optical characteristic values in a predetermined range for each framed lens Lf based on the images of the plurality of divided measurement light beams obtained by the optical measurement in step S1.

In step S4, a feature point Pf is detected, and the process proceeds to step S5. In this step S4, the feature point detection unit 57 detects feature points Pf in each framed lens Lf. In step S4, if the number of feature points Pf to be detected is set to a plurality, a plurality of feature points Pf are detected for each framed lens Lf.

In step S5, the optical characteristic value of the feature point Pf is extracted, and the process proceeds to step S6. In this step S5, the feature point characteristic extraction unit 58 extracts the optical characteristic value of the feature point Pf in each framed lens Lf detected in step S4 from the numerical data of the optical measurement value calculated in step S3.

In step S6, the relative prism error Ep is determined, and the process proceeds to step S7. In this step S6, the error calculation unit 61 calculates the relative prism error Ep from the optical characteristic value of the feature point Pf of the double-framed lens Lf extracted in step S5, and the error determination unit 62 determines that the relative prism error Ep is acceptable. It is determined whether or not it is within the range Lt.

In step S7, a mapping image Im is formed, and the process proceeds to step S8. In this step S7, the mapping forming unit 54 forms a mapping image Im representing the distribution of optical characteristic values on the framed lens Lf based on the numerical data of the optical measurement values calculated in step S3.

In step S8, a superimposed image Is is generated, and the process proceeds to step S9. In step S8, the lens image acquisition unit 55 acquires a lens image Ir from the images of the pair of framed lenses Lf captured in step S2, and the superimposed image generation unit 56 maps the lens image Ir formed in step S7. The image Im is superimposed to generate a superimposed image Is. Note that step S7 and step S8 may be performed before or between steps S4 to S6, and are not limited to the order of the first embodiment.

In step S9, the superimposed image Is is displayed, and this measurement control process is ended. In this step S9, the image control unit 59 adds a feature point index m indicating the position of the feature point Pf detected in step S4 and a feature indicating the optical characteristic value at the feature point Pf to the lens image Ir acquired in step S2. A superimposed image Is in which the point characteristic field Cc and the error determination field Ce indicating the determination result in step S6 are superimposed is displayed on the display unit 12 (display screen 12a).

In this way, the lens measuring device 10 acquires the optical characteristic values in a predetermined range of the lens L to be tested, and also acquires the optical characteristic values at the set feature points Pf, and displays them in the feature point characteristic column Cc. can be displayed on the display section 12, which is an example of an optical characteristic output section. Therefore, the lens measuring device 10 can not only determine the optical characteristic values in a predetermined range of the lens L to be tested, but also the optical characteristic values of a predetermined feature point Pf, thereby improving usability.

Further, since the lens measuring device 10 superimposes the feature point index m indicating the position of the feature point Pf on the lens image Ir, it is possible to easily grasp the position of the feature point Pf. In particular, since the lens measuring device 10 also superimposes the mapping image Im showing the optical characteristic values in a predetermined range on the lens image Ir, it is possible to easily understand the distribution of the optical characteristic values, and also make it possible to easily understand the distribution of the optical characteristic values. The position of the feature point Pf can be easily grasped.

In addition, when the lens L is a pair of framed lenses Lf fixed to an eyeglass frame F, the lens measuring device 10 has a relative prism error Ep of a feature point Pf in the left and right framed lenses Lf within an allowable range Lt. It is possible to determine whether or not it is within the range, and display the determination result on the display unit 12. Therefore, by setting an arbitrary position where such a relative prism error Ep is obtained as a feature point Pf, the lens measuring device 10 can ensure that the relative prism error Ep at the obtained arbitrary position is within the tolerance range Lt. It is possible to easily determine whether or not there is one.

The lens measuring device 10 of Example 1 of the lens measuring device according to the present disclosure can obtain the following effects.

In the lens measurement device 10, the optical property calculation unit 53 calculates the optical property value of the test lens L by receiving the measurement light projected from the light projecting optical system 20 and transmitted through the test lens L by the light receiving optical system 30. Calculate. Then, in the lens measuring device 10, the feature point detection section 57 detects the feature point Pf of the lens L to be tested, the feature point characteristic extraction section 58 extracts the optical characteristic value at the feature point Pf, and the optical characteristic output section (implementation In Example 1, the display unit 12) outputs the optical characteristic value of the feature point Pf. Therefore, the lens measuring device 10 can easily grasp the optical characteristic value of the predetermined feature point Pf.

The lens measuring device 10 includes a light receiving optical system 30 that includes a pattern plate (Hartmann plate 31 in the first embodiment) that separates the measurement light that has passed through the test lens L into a plurality of divided measurement light beams, and a plurality of separated measurement light beams. It has a screen 32 on which the measurement light beam is projected, and a measurement light receiving element 35 that transmits therethrough and receives a plurality of divided measurement light beams. Then, in the lens measuring device 10, the feature point characteristic extraction unit 58 extracts the optical characteristic value at the feature point Pf by determining the optical characteristic value at the coordinate position corresponding to the feature point Pf on the pattern plate. Therefore, in the lens measuring device 10, the feature point characteristic extraction unit 58 can easily and appropriately extract the optical characteristic value at the feature point Pf.

The lens measuring device 10 includes an imaging unit 14 that images the lens L to be tested to obtain a lens image Ir, and an optical characteristic output unit superimposes a feature point index m indicating a feature point Pf on the lens image Ir and outputs the superimposed feature point index m indicating a feature point Pf. do. Therefore, the lens measuring device 10 can easily determine the position of the feature point Pf on the lens L to be tested.

The lens measuring device 10 includes a mapping forming section 54 that forms a mapping image Im representing the distribution of optical characteristic values of the lens L to be tested based on the optical characteristic values calculated by the optical characteristic calculating section 53, and an optical characteristic output section. outputs the lens image Ir with the feature point index m and the mapping image Im superimposed on it. Therefore, the lens measuring device 10 can easily grasp the distribution of optical characteristic values in the lens L to be tested, and also easily grasp the position of the feature point Pf on the distribution of the optical characteristic values. can.

The lens measuring device 10 includes an imaging unit 14 that images the lens L to be tested to obtain a lens image Ir, and a feature point detection unit 57 detects the outer periphery Op of the lens L to be tested based on the lens image Ir. , the feature point Pf is detected based on the distance from the outer peripheral edge Op. Therefore, the lens measuring device 10 can easily and appropriately detect the feature point Pf with the feature point detection unit 57.

The lens measuring device 10 includes an imaging unit 14 that images the lens L to be tested to obtain a lens image Ir, and a feature point detection unit 57 detects an index based on the lens image Ir and converts the position of the index into a feature point. Let it be Pf. Therefore, the lens measuring device 10 can easily and appropriately detect the feature point Pf with the feature point detection unit 57.

The lens measuring device 10 includes a nose piece support member 13c that supports the nose piece Np of the eyeglass frame F to which the test lens L is fixed, and a lens table 13d against which the eyeglass frame F supported thereon is pressed. , a feature point detection unit 57 detects a feature point Pf based on the positions of the nosepiece support member 13c and the lens table 13d. Therefore, the lens measuring device 10 can easily and appropriately detect the feature point Pf with the feature point detection unit 57.

The lens measurement device 10 includes an error calculation unit 61 that calculates a relative prism error Ep based on optical characteristic values at feature points Pf of a pair of lenses L to be tested fixed to a spectacle frame F, and an error calculation unit 61 that calculates a relative prism error Ep within a tolerance range Lt. and an error determining unit 62 that determines whether or not the difference is within the range. Further, in the lens measuring device 10, a light projecting optical system 20 and a light receiving optical system 30 are provided corresponding to both of the pair of lenses L to be tested, and the optical characteristic calculating section 53 After calculating the respective optical characteristic values, the feature point detection unit 57 detects the respective feature points Pf of the pair of lenses L to be tested, and the feature point characteristic extraction unit 58 detects the respective features of the pair of lenses L to be tested. Extract the optical characteristic value of point Pf. In the lens measuring device 10, the error calculating section 61 sets the difference between the optical characteristic values of the respective feature points Pf of the pair of lenses L to be tested as a relative prism error Ep, and the optical characteristic output section calculates the difference between the optical characteristic values of the respective feature points Pf of the pair of lenses L to be tested, and Output the determination result. Therefore, by setting an arbitrary position as a feature point Pf, the lens measuring device 10 can easily determine whether the relative prism error Ep at the feature point Pf is within the allowable range Lt. .

In the lens measurement device 10, the error determination unit 62 uses different tolerance ranges Lt depending on the prism value and refractive power at the feature point Pf. Therefore, the lens measuring device 10 can make a more appropriate determination as to whether the relative prism error Ep at the feature point Pf is within the allowable range Lt, depending on the prism value and refractive power. .

In the lens measuring device 10, the feature point characteristic extraction unit 58 calculates the optical characteristic deviation amount, which is the difference between the optical characteristic value of the test lens L on the measurement optical axis Lm and the optical characteristic value of the prescription, and outputs the optical characteristic. The unit may output the optical characteristic deviation amount. In this case, the lens measuring device 10 can grasp the amount of deviation in optical characteristics in addition to the optical characteristic value of the feature point Pf, and can widen the range of evaluation of the lens L to be tested.

Therefore, in the lens measuring device 10 as an example of the lens measuring device according to the present disclosure, it is possible to grasp the optical characteristic value of a predetermined feature point Pf on the lens L to be tested.

Although the lens measuring device of the present disclosure has been described above based on Example 1, the specific configuration is not limited to Example 1, and departs from the gist of the invention according to each claim. Changes and additions to the design are permitted unless otherwise specified.

For example, in Example 1, a mapping image Im having a jagged outer shape is superimposed on a predetermined region of the lens L to be tested in the lens image Ir (see FIG. 5). This is because, in the measurement optical system Om, the range in which optical characteristic values can be measured is limited by the size of the Hartmann plate 31, and the optical characteristic values are affected by the large number of apertures 31a formed in the Hartmann plate 31. This is because the outline of the measurement range is not a smooth curve but is expressed jaggedly. Therefore, the mapping forming unit 54 may form a mapping image Im showing the distribution of optical characteristic values over the entire lens region corresponding to the test lens L in the lens image Ir, beyond the jagged outer shape. In this case, the mapping forming unit 54 detects the outer circumferential edge Op of the test lens L in the lens image Ir, sets the outside of the measurement range of the measurement optical system Om inside the outer circumferential edge Op as a failure measurement area, and The distribution of optical characteristic values in the failed measurement area is estimated based on the distribution of optical characteristic values based on the distribution of optical characteristic values. Thereby, the mapping forming unit 54 can form a mapping image Im showing the distribution of optical characteristic values over the entire lens area, and by superimposing the mapping image Im including the estimated location on the lens image Ir, the lens image It is possible to show the distribution of optical characteristic values over the entire area of the tested lens L in Ir.

Moreover, in Example 1, a pair of framed lenses Lf fixed to an eyeglass frame F are measured as the lenses L to be tested. However, the lens L to be tested may be a circular unprocessed lens or a ground lens for eyeglasses, and is not limited to the configuration of the first embodiment. Even in such a case, the optical characteristic value at the feature point Pf of the lens L to be tested can be shown. Furthermore, if the pair of framed lenses Lf fixed to the eyeglass frame F is measured as in Example 1, it is determined whether the relative prism error Ep at the feature point Pf is within the allowable range Lt. The determination result can be output.

Furthermore, in the first embodiment, an example is shown in which the imaging unit 14 is configured with a monocular digital camera disposed between a pair of light projection optical systems 20. However, as long as the imaging unit 14 can take an image of the test lens L held by the lens holding mechanism 13, for example, a compound eye digital camera may be used, or a plurality of monocular cameras may be used. The lens image Ir may be generated by combining images captured by these, and the configuration is not limited to the first embodiment. Furthermore, although the imaging section 14 was provided in the upper accommodation section 11a of the apparatus main body 11, if the imaging section 14 can take an image of the test lens L held by the lens holding mechanism 13, it can be used on the wall that partitions the lens set space 15. It may also be provided at other positions such as the lens holding member 13a, the lens table 13d, etc., and is not limited to the configuration of the first embodiment.

In the first embodiment, the display section 12 is used as the optical characteristic output section. However, if the optical characteristic output section outputs at least the optical characteristic value of the feature point Pf, it can be an audio output section that outputs audio, a printing section that prints, or an external memory or server that uses the optical characteristic value as data. It may also be a data output unit that outputs data, and is not limited to the configuration of the first embodiment.

In Example 1, a feature point index m indicating the position of a feature point Pf is superimposed on a superimposed image Is obtained by superimposing a mapping image Im on a lens image Ir. However, a superimposed image in which the feature point index m is superimposed on the lens image Ir may be output from the optical characteristic output section, and the configuration is not limited to the first embodiment.

10 Lens measuring device 10 12 Display unit (as an example of an optical characteristic output unit) 13c Nose support member 13d Lens table 14 Imaging unit 20 Light projecting optical system 30 Light receiving optical system 31 Hartmann plate (as an example of a pattern plate) 32 Screen 35 Light-receiving element for measurement 53 Optical characteristic calculation section 54 Mapping formation section 57 Feature point detection section 58 Feature point characteristic extraction section 61 Error calculation section 62 Error discrimination section Ep Relative prism error F Glasses frame Im mapping image Ir Lens image L Subject Lens Lt Tolerance range m Feature point index Np Nose pad Op Outer periphery Pf Feature point

Claims (10)

a light projection optical system that projects measurement light onto the lens to be tested;
a light receiving optical system that receives the measurement light transmitted through the test lens;
an optical property calculation unit that calculates an optical property value of the test lens based on the measurement light received by the light receiving optical system;
a feature point detection unit that detects feature points on the test lens;
a feature point characteristic extraction unit that extracts an optical characteristic value at the feature point from the calculation result by the optical property calculation unit;
A lens measuring device comprising: an optical characteristic output section that outputs an optical characteristic value of the feature point obtained by the feature point characteristic extraction section. The light receiving optical system includes a pattern plate that separates the measurement light that has passed through the test lens into a plurality of divided measurement light beams, a screen on which the plurality of divided measurement light beams separated by the pattern plate are projected, and the screen. A measurement light receiving element that transmits and receives a plurality of divided measurement light beams,
2. The feature point characteristic extraction unit extracts the optical characteristic value at the feature point by determining an optical characteristic value at a coordinate position corresponding to the feature point on the pattern plate. lens measuring device. The lens measuring device according to claim 1 or 2,
Furthermore, it includes an imaging unit that captures an image of the lens to be tested to obtain a lens image,
The lens measuring device is characterized in that the optical characteristic output unit outputs a superimposed feature point index indicating the feature point on the lens image. The lens measuring device according to claim 3,
Further, a mapping forming section is provided that forms a mapping image representing a distribution of optical characteristic values of the test lens based on the optical characteristic values calculated by the optical characteristic calculating section,
The lens measuring device is characterized in that the optical characteristic output unit outputs the lens image by superimposing the feature point index and the mapping image . The lens measuring device according to any one of claims 1 to 4,
Furthermore, it includes an imaging unit that captures an image of the lens to be tested to obtain a lens image,
The lens measuring device is characterized in that the feature point detection unit detects an outer periphery of the test lens based on the lens image, and detects the feature point based on a distance from the outer periphery. The lens measuring device according to any one of claims 1 to 4,
Furthermore, it includes an imaging unit that captures an image of the lens to be tested to obtain a lens image,
The lens measuring device is characterized in that the feature point detection unit detects an index based on the lens image, and sets the position of the index as the feature point. The lens measuring device according to any one of claims 1 to 4,
The device further includes a nose pad support member that supports a nose pad of an eyeglass frame to which the test lens is fixed, and a lens table against which the eyeglass frame with the nose pad supported is pressed against the nose pad support member. ,
The lens measuring device is characterized in that the feature point detection section detects the feature points based on the positions of the nosepiece support member and the lens table. The lens measuring device according to any one of claims 1 to 7,
Further, an error calculation unit that calculates a relative prism error based on optical characteristic values at the characteristic points of the pair of test lenses fixed to the eyeglass frame;
an error determining unit that determines whether the relative prism error is within an allowable range;
The light projecting optical system and the light receiving optical system are provided corresponding to both of the pair of lenses to be tested,
The optical property calculation unit calculates an optical property value of each of the pair of lenses to be tested,
The feature point detection unit detects the feature points of each of the pair of lenses to be tested,
The feature point characteristic extraction unit extracts an optical characteristic value of each of the feature points of the pair of lenses to be tested,
The error calculation unit defines the difference between the optical characteristic values of the characteristic points of each of the pair of lenses to be tested as the relative prism error,
The lens measuring device is characterized in that the optical characteristic output section outputs a determination result by the error determining section. 9. The lens measuring device according to claim 8, wherein the error determining unit uses the allowable range that differs depending on the prism value and refractive power at the feature point. The feature point characteristic extraction unit calculates an optical characteristic deviation amount that is a difference between an optical characteristic value of the characteristic point and an optical characteristic value of the prescription;
The lens measuring device according to any one of claims 1 to 9, wherein the optical characteristic output section outputs the optical characteristic deviation amount.