JPH07325014A - Lens meter - Google Patents

Abstract

PURPOSE:To precisely measure the optical center distance of a lens and the distance between pupils by providing measuring scales and a position adjusting means. CONSTITUTION:A lens is put on a nose piece 3, the optical center of a lens and a measurement optical axis are put together while a measuring target being observed by an ocular lens-barrel 2, a marking apparatus 6 is lowered and a marking is done. These processes are carried out for both lenses. Then, the position of a nose pat 11 is regulated by the nose piece 3 and the center of a spectacles 10 in the right and left directions and the 0-standard of the measuring scales are put almost together. OCD is read out while the marked mark on the lenses and the measuring scales being observed. The OCD of the right (or left) lens can be read out as a value of the measuring scale at which the center marking mark is overlaid. The read out value is the center OCD, which a distance from the right and left center line of the spectacles to the optical axial center.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens meter,
More specifically, it relates to a mechanism for measuring the distance between the optical centers of the left and right lenses of the spectacles and the distance between the pupils.

[0002]

2. Description of the Related Art Optical Center Distance (hereinafter referred to as O in the present specification) of a lens framed in a spectacle frame.
Abbreviated as CD. ) And the inter-pupil distance of the subject are important information for suitability of the glasses currently used and for newly adjusting the glasses.

In the conventional measurement of OCD, a marking mark is applied to the optical center of the lens found by the lens meter, and the distance between the left and right marking marks is measured by a ruler or the like.

Recently, instead of measuring with a ruler, a member that moves together with the spectacle frame and a mechanism for detecting the amount of movement are provided, and the OCD is measured from the amount of movement in detecting the optical centers of the left and right lenses. Devices are also known.

[0005]

However, since the spectacle frame has a warp and the center position of the spectacles is not clear, it is difficult to accurately measure the OCD with a ruler such as the former. . Further, the latter device has a drawback that the number of parts is increased and the device is expensive because it is necessary to provide a complicated mechanism for measuring the OCD.

In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide an apparatus having a simple structure and capable of accurately measuring the OCD and the interpupillary distance.

[0007]

The present invention is characterized by having the following constitution in order to solve the above problems.

(1) In a lens meter for measuring the refraction characteristics of a lens to be inspected, a lens pad for contacting the upper or lower part of the frame to hold the vertical position of the spectacle frame, and the lens pad. The measurement scale given to
Adjusting means for moving the position of the lens pad to adjust the vertical position of the spectacle frame, and a nose pad that contacts the nose pad of the spectacle frame to sandwich the spectacle frame with the lens pad. And means.

(2) The nose rest means of (1) is also used as a lens mount, and the lower part of the lens mount is processed into a shape in which the nose rest pad comes into contact.

(3) The lens mounting table of (2) is characterized in that the test lens is held substantially parallel to the installation surface of the lens meter.

(4) The measurement scale of (1) is characterized in that it is provided symmetrically with respect to the center line of the nose pad means.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a vertical eyepiece lens meter to which the present invention is applied, and FIG. 2 is a right side view thereof.

The lens meter 1 has an eyepiece tube 2. The measuring optical system of the vertical eyepiece lens meter is based on a well-known optical system with a traditional straight optical path, and the measuring optical path is bent by using a mirror to bring it to the position shown in the figure. An eyepiece tube 2 and a nose piece 3 are arranged.

The upper part of the nose piece 3 on which the lens is placed is provided with the two nose pads 1 of the spectacles 10 during the OCD measurement.
It has a hem-widening shape so that 1 contacts. Reference numeral 4 denotes a lens pad, and the lens pad 4 is moved back and forth (left and right direction in FIG. 2) by turning a lens pad knob 5.
On the front surface 4a of the lens contact 4, measuring scales 4b for OCD measurement are evenly provided on the left and right with a position corresponding to the center of the nose piece 3 as a reference. Reference numeral 6 is a marking point device, and the marking point at the center thereof marks the center of the nose piece 3.

Next, the operation of OCD measurement in the lens meter having the above construction will be described. First, marking marks are applied to the left and right lenses of the spectacles 10. For this work, one lens is placed on the nose piece 3, and the optical center of the lens is aligned with the measurement optical axis while observing the measurement target with the eyepiece tube 2. No adjustment of the astigmatic axis direction is required for the measurement of OCD. In this state, the marking point device 6 is lowered to mark the marking point. Similarly, the other lens is also marked.

When the marking operation is completed, the front surface of the lens is directed to the lens contact 4 side, and the nose pad 11 is brought into contact with the upper portion of the nose piece 3 on the rear side. The knob 5 is turned to move the lens contact 4 to the front, and the glasses are held by being sandwiched between the nose piece 3 and the lens contact 4. When the position of the nose pad 11 is regulated by the nose piece 3 and the spectacles 10 are held stably, the center of the spectacles 10 in the left-right direction and the 0 standard of the measurement scale 4b substantially match.

The examiner is located in front of the lens meter 1,
Check the marking mark on the lens and the measuring scale 4b
Read D. FIG. 3 is a view of this from the examiner's side.
The OCD of the right lens is read from the value of the measurement graduation 4b overlapping the center mark mark 20a. Similarly, the left lens also reads the measurement scale 4b on which the central mark mark 20b is located. The value thus read is the center OCD which is the distance from the center line of the eyeglasses to the optical axis. The distance between the optical axes of the left and right lenses is the center OCD of the left and right.
It is obtained by calculating the sum of the values.

Next, the measurement of the interpupillary distance by this apparatus will be described. First, the user wears glasses to mark the center of the pupil with a pen or the like. Put the glasses on the lens and 4
The sample is held by being sandwiched between the spice 3 and measured in the same manner as the above-mentioned OCD measurement. As a result, the distance between the pupils of one eye and the distance between the eyes of both eyes, which is the sum thereof, are obtained.

The above embodiment can be variously modified,
The object is not limited to the eyepiece type, but may be, for example, the conventional auto lens meter shown in FIG. 4 (the same members as those in the apparatus shown in FIGS. 1 and 2 are designated by the same reference numerals) and the projection type. It can be applied easily without making any major changes to the lens meter.

[0019]

According to the present invention, with an extremely simple structure,
OCD measurement and PD measurement of the lens framed in the spectacle frame can be performed. Especially, the OCD measurement and the one-eye PD measurement from the center of the spectacles of the left and right lenses can be accurately performed.
Including the prism prescription, the spectacle prescription level in the spectacle store can be improved. Further, as compared with the conventional measurement by a ruler, the examiner does not need to hold the eyeglasses, which increases the degree of freedom of work.

[Brief description of drawings]

FIG. 1 is a front view of a vertical eyepiece lens meter to which the present invention is applied.

FIG. 2 is a right side view of FIG.

FIG. 3 is a view of a marking mark on the lens and a measurement scale provided on the front surface of the lens contact, viewed from the examiner side.

FIG. 4 is a diagram showing an example in which the present invention is applied to a conventional auto lens meter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lens meter 3 Nose piece 4 Lens contact 4b Measurement scale 10 Glasses 11 Nose pad

Claims (4)

[Claims] 1. In a lens meter for measuring the refraction characteristics of a lens to be inspected, a lens pad for contacting the upper or lower part of the frame to hold the vertical position of the spectacle frame, and the lens pad. The measurement scale provided, adjusting means for moving the position of the lens contact to adjust the vertical position of the spectacle frame, and contacting the nose pad of the spectacle frame with the spectacle frame A lens meter, comprising: a nose pad means sandwiched by a lens pad. 2. The lens mount according to claim 1, wherein the nose pad means is also used as a lens mounting table, and the lower part of the lens mounting table is processed into a shape with which a nose pad is brought into contact.
Ta. 3. The lens mounter according to claim 2, wherein the lens mounter holds the test lens substantially parallel to the installation surface of the lens meter. 4. The lens meter according to claim 1, wherein the measuring scale is provided symmetrically with respect to the center line of the nose pad means.