JP2554949B2 - Eyeglass lens measuring device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an eyeglass lens measuring device used in an ophthalmology clinic, an eyeglass store, or the like.

[Prior Art] Conventionally, a spectacle lens measuring device called a so-called auto lens meter has been used to measure a refractive power, an optical axis, and the like of a spectacle lens. In this type of device, a lens to be inspected is inserted between a projection unit that projects a predetermined light beam and a light receiving unit that receives and forms an image of this light beam, and the refractive power and optical axis position of this lens can be determined. Is being done. In such an eyeglass lens measuring device, it is possible to measure an eyeglass lens attached to an eyeglass frame.

By the way, in the spectacle lens attached to the spectacle frame, it is necessary to make the distance between the optical axes of the left and right lenses appropriate for the user. Therefore, it is desired that the eyeglass lens measuring device described above can accurately measure the distance between the optical axes. In the conventional spectacle lens measuring device, since the contact member for contacting the nose pad of the spectacle frame is attached to the angle determining patch plate that can be adjusted in the direction perpendicular to the measurement optical axis, the contact member is provided on the opposite side of the measurement optical axis. It doesn't move. Therefore, contact members are separately provided on the left and right sides of the projection and light receiving optical systems, and the right contact member is used when measuring the left eyeglass lens, and the left contact member is used when measuring the right eyeglass lens. The contact members are used to detect the optical axis of the spectacle lens while moving these contact members to the left and right, and the position of the contact member at the time of detection is read. Seeking distance.

[Problems to be Solved by the Invention] However, in the conventional case as described above, not only is it troublesome to replace the spectacle lens for each of the left and right abutting members, but also an attempt is made to automatically perform processing of measured values. In this case, it is difficult to automatically identify which of the left and right contact members is used.

An object of the present invention is to solve the above-mentioned problems, to provide a spectacle lens measuring device which has good operability in measuring the distance between the optical axes of the spectacle lens and is convenient even in automatic measurement.

[Means for Solving the Problems] In order to achieve the above-mentioned object, in the eyeglass lens measuring device according to the present invention, the measurement light flux is passed through the eyeglass lens attached to the eyeglass frame to measure the refractive power of the eyeglass lens. In a spectacle lens measuring device having a refraction measuring optical system for, a contact member that is movable against both sides of the measurement optical axis in the interpupillary direction in contact with the nose pad of the spectacle frame. And a measuring means for detecting the amount of movement of the contact member and obtaining the distance between the optical axes of the spectacle lenses based on the amount of movement.

[Operation] In the spectacle lens measuring device having the above-described configuration, the contact member applied to the nose pad of the spectacle frame is moved across the measurement optical axis of the measurement optical system in the interpupillary direction, and the amount of movement is measured. Then, the distance between the optical axes is obtained.

[Examples] The present invention will be described in detail based on the illustrated examples.

FIG. 1 is a side view and FIG. 2 is a plan view. A projection lens barrel 1 having a built-in projection unit of a refractive power measurement optical system and a light-receiving light-receiving lens barrel 2 having a light-receiving unit are The measurement optical axes A are aligned and face each other, and are attached to the base 3. On the side of the measurement optical axis A, a flat plate-like backing plate 4 for determining the angle of the spectacle frame GF is installed on the base 3 so as to be positionally adjustable in a direction B perpendicular to the measurement optical axis A. Further, a movable rail 5 is provided side by side with the contact plate 4 in a horizontal direction C orthogonal to the measurement optical axis A, and is supported by a roller 6 attached to the base 3. The amount of movement of the movable rail 5 is converted into the amount of rotation of the shaft 7a of the potentiometer 7 fixed to the base 3 so that the position can be read by an electric signal. The movable rail 5 is provided with a contact member 8 that comes into contact with the nose pad GP of the spectacle frame GF.
It is stably held by the contact plate 4. At this time, the attachment portion 8a of the contact member 8 to the movable rail 5
It is preferable that the contact member 8 and the nose pad GP are always secured in contact with each other when the contact member 8 is lightly biased toward the nose pad GP side in a thin spring shape.

At the time of measurement, the light beam emitted from the projection lens barrel 1 of the projection unit is incident on the light receiving lens barrel 2 of the light receiving unit via the spectacle lens GL to be inspected, and the spectacle lens GL and the refractive power are changed by the same method as the conventional method. Is measured and the optical axis is detected. At this time, the position of the spectacle lens GL with respect to the measurement optical axis A is set in the direction B on the backing plate 4.
It can be adjusted by moving to.

When measuring the distance between the optical axes of the left and right eyeglass lenses GL, the abutting member 8 is moved to move the eyeglass frame GF, and the optical axis position of the eyeglass lens GL on one side is first obtained. The position of the member 8 is read from the output of the potentiometer 7. Next, without removing the spectacle frame GF from the contact member 8, the contact member 8 is moved over the measurement optical axis A to the other side, and the optical axis position of the other spectacle lens GL is similarly measured. In this way, when the positions of the optical axes of the spectacle lenses GL on both sides are measured, the distance between these optical axes can be obtained from the difference between the positions of the two. In this case, the contact member 8 does not move in the direction close to the measurement optical axis A, and the contact member 8 can easily move in the left and right eye width direction without interfering with the light receiving optical system.

The movable rail 5 may be moved by the driving force of a motor or the like, or an automatic control circuit for the motor may be provided to perform automatic measurement. At this time, since the center position of the spectacle frame GF is uniquely determined by the position of the contact member 8, it is immediately identified which of the left and right spectacle lenses GL is being measured by the apparatus. This is convenient because there is little risk of erroneous measurement during automatic measurement.

Although the potentiometer 7 is used for reading the position in the above-mentioned embodiment, it is needless to say that it may be performed by using an optical rotary encoder or a linear encoder. Alternatively, the rail may be fixed to the base, the contact member provided with the roller may be slid along the rail, and the movement thereof may be measured by an appropriate method.

[Effects of the Invention] As described above, the spectacle lens measuring device according to the present invention has good operability because it is not necessary to replace the spectacle frame each time when measuring the left and right spectacle lenses. It has the advantages that it is simplified and that the left and right sides of the spectacle lens being measured can be easily identified, and that the distance between the optical axes can be measured more accurately.

[Brief description of drawings]

The drawings show an embodiment of the spectacle lens measuring device according to the present invention. FIG. 1 is a side view and FIG. 2 is a plan view. Reference numerals 1 and 2 are lens barrels, 4 are cover plates, 5 are movable rails, 7 is a potentiometer, 8 is a contact member, GL is a spectacle lens, and GF.
Is an eyeglass frame and GP is a nosepiece.

Claims (1)

(57) [Claims] 1. A spectacle lens measuring device having a refraction measuring optical system for measuring a refracting power of a spectacle lens by passing a measuring light beam through the spectacle lens attached to the spectacle frame, which is brought into contact with a nose pad of the spectacle frame. A contact member that is movable across the measurement optical axis in the eye width direction in the contact state, and the amount of movement of the contact member is detected, and the distance between the optical axes of the spectacle lenses is obtained from the amount of movement. An eyeglass lens measuring device comprising: a measuring unit.