JPH0572077A - Lens meter - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide a lens meter capable of accurately and efficiently measuring the refractive characteristics of a progressive multifocal lens or a bifocal lens. A lens mounting means for supporting a lens to be inspected, a lens measuring means for measuring a refraction characteristic of a lens mounted on the lens mounting means, and an in-plane orthogonal to an optical axis of the measuring means. A lens having a lens table 21 that comes into contact with the lens in order to regulate the movement range of the lens placed on the lens placement means, and a lens movement amount detection means for measuring the movement amount of the lens table 21. It is a meter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens meter, and more particularly to a lens meter capable of highly accurately measuring the refraction characteristics of a progressive multifocal lens or a bifocal lens.

[0002]

2. Description of the Related Art Progressive multifocal lenses and bifocal lenses are
Simply indicating the refractive power information of a lens does not indicate the characteristics of that lens, but it is the refractive characteristics of a progressive multifocal lens or a bifocal lens that cannot be obtained without using both the positional information inside the lens and the refractive power information at that position. Has been shown.

By the way, in the conventional lens meter, the lens can be arranged at a predetermined position with respect to the optical axis of the lens meter optical system, but it is possible to measure the position or a relative position with reference to an arbitrary position. There wasn't.

[0004]

When measuring the refracting power of a progressive multifocal lens or a bifocal lens, it is impossible to accurately and quickly measure the refracting power measuring position in the lens, and for example, a ruler is used. Then, it is necessary to measure the refracting power measurement position, and as a result, there is a problem that the measurement efficiency of the refraction characteristics of the progressive power multifocal lens or the bifocal lens is low and the measurement accuracy is low.

The present invention has been made in view of such problems of the conventional lens meter, and it is possible to measure the refraction characteristics of a progressive multifocal lens or a bifocal lens with high accuracy and efficiency. It is an object to provide a lens meter that can be used.

[0006]

SUMMARY OF THE INVENTION A lens meter according to the present invention for solving the above-mentioned problems is provided with a lens mounting means for supporting a lens to be inspected, and a lens measurement for measuring a refraction characteristic of a lens mounted on the lens mounting means. Means, a lens table that comes into contact with the lens for restricting the movement range of the lens mounted on the lens mounting means in a plane orthogonal to the optical axis of the measuring means, and the amount of movement of the lens table And a lens movement amount detecting means for performing the operation.

[0007]

Since the lens meter of the present invention has the lens movement amount detecting means for measuring the movement amount of the lens table contacting the lens in order to regulate the movement range of the lens, the predetermined amount of the lens to be inspected is determined. The position where the refracting power is measured can be detected with high accuracy and efficiency based on the position, which is particularly advantageous for measuring the refraction characteristics of the progressive multifocal lens or the bifocal lens.

[0008]

First Embodiment (Structure) FIG. 3 is a perspective view showing the appearance of a lens meter according to the first embodiment of the present invention. This lens meter has a lens receiver 20 for mounting a progressive multifocal lens LE to be tested, which is framed in a spectacle frame F, and a lens table 21 on which the frame is mounted. The height of the lens table 21 is changed by the lever 22 (the distance between the measurement optical axis O and the table surface 21a), and the vertical position on the lens LE to be measured can be changed within a plane substantially perpendicular to the measurement optical axis O. The left and right position can be changed by moving the frame F left and right on the table surface 21a of the lens table.

The amount of movement of this lens LE to be inspected is set by a lens movement setting device 25 which will be described later. The measurer looks into the eyepiece lens 23, rotates the measurement knob 24 until a target image on a reticle (not shown) is sharply formed, and from the diopter scale displayed in the eyepiece visual field in association with the rotation amount. The refractive properties of the lens can be measured. Since the refraction characteristics measuring optical system itself of this embodiment has the same configuration as a known telescope type lens meter, its explanation is omitted.

4 and 5 are partially enlarged views showing the configuration of the lens movement amount setting device 25. The lens movement amount setting device 25 includes a feed screw 251 having a knob 250, and a moving block 25 that is moved up and down by rotation of the feed screw 251.
2 and a cross section 2 for guiding the vertical movement of the moving block 252
Guide rail 253 having a dovetail structure as indicated by 53a
And the plate substrate 25 fixed to the moving block 252
4, the display plate 255 adhered on the substrate 254, and the index plate 27 attached to the lens table 21
It is composed of 0 and.

The display plate 255 has an optical center display 257 consisting of an "OC" display indicating the optical center position or the geometrical center position and a display line, and the optical center 1 of the lens illustrated in FIG.
5 to the fitting point 12, a fitting position display 258 composed of a "PP" display and a display line separated from the display 257 by a distance equal to the distance a from the display 257 to the optical center 15 of the lens in FIG. Distance from display 257 by a distance equal to
The distance measuring section display 259 including the “R” display and the display line, and “A” separated from the display 257 by a distance equal to the distance B between the optical center 15 and the near refraction characteristic measurement instruction mark 16 in FIG.
A "DD" display and a near-distance measuring section display 256 consisting of display lines are respectively provided.

By the way, the distances A, B, and a and the nose side distance C between the near-distance refraction characteristic measuring portion instruction mark 16 and the optical center instruction mark 15 are different for each lens maker. Therefore, in this embodiment, displays 256 to 259 are provided in accordance with the distance numerical values of the lens having the highest market share. In order to further improve the convenience of the user of this lens meter, in the present embodiment, the second distance measuring section display line 259 ′ and the second near distance measuring line are used in accordance with the distance numerical value of the lens having the second largest market share. Measuring line 25
6'is given a color different from that of the first display lines 256 and 259 (for example, 256 and 259 are black, 256 'and 259' are green).

Further, in order to make the present lens meter usable for the measurement of any commercially available lens, the above-mentioned display lines 256, 256 'to 25 are provided on the display plate 255.
A scale 260 is provided in parallel with the array of 8, 258 '. The scale 260 has its 0 position 261 at the same position as the optical center display 257, and the near scale 260 is placed on the upper side.
a, the distance scale 260b is displayed on the lower side in different colors (for example, the distance scale is black and the near scale is red), and the near scale has an "N" mark 2 indicating that.
60c, and the distance scale is provided with an "F" mark 260d to that effect.

A bent portion 270a of a transparent plastic index plate 270 having an L-shaped cross section is fixed to the lower surface of the lens table 21.
Is configured so that the upright portion thereof faces the display plate 255. Index lines 271 are provided on the index plate 270. Operation and Measuring Method Next, the operation of the first embodiment and the method of measuring the lens movement amount at the time of measuring the lens to be inspected according to the operation will be described with reference to FIGS.

First step: As shown in FIG. 6, the measurer aligns the lens to be measured with a known lens meter, that is, aligns the optical center of the lens with the measurement optical axis of the lens meter to measure the lens to be measured. The optical center 15 of the LE is aligned with the measurement optical axis 15 of the lens meter.
At this time, the lower end of the lens frame of the frame F is always in contact with the table surface 21a of the lens table 21, and the up and down movement of the lens LE (direction of arrow UD) is the up and down movement of the lens table 21 due to the rotation of the lever 22. The lens LE is moved to the left and right (in the direction of arrow RL) by pushing the table surface 21a of the frame F itself with a finger.

Second step: As shown in FIG. 7, the knob 2
50 is rotated to rotate the feed screw 251, and the moving block 252 is moved to display the optical center 2 on the display plate 255.
The display line 57 and the index line 271 on the index plate 270 are matched. Third step: Next, as shown in FIG. 8, the lever 22 is rotated to lower the lens table 21, and the lens LE is moved downward. At this time, the frame F is placed on the table surface 21a.
Needless to say, be careful not to leave. Then, the lens is lowered until the display line of the distance measuring section display 259 of the display plate 255 and the index line 271 of the index plate 270 match.

As a result, the optical center 15 of the lens LE is lowered by the distance A, so that the distance refraction characteristic measuring unit 13 of the lens LE can be aligned with the measurement optical axis O of the lens meter. In this state, the refractive property of the lens is measured by the same method as a known lens meter, and the value is used as the distance dioptric power. Fourth step: As shown in FIG. 9, the lever 22 is rotated to raise the lens table 21 to raise the lens LE, and the index line 271 of the index plate 270 and the near-distance measuring section display on the display plate 255 are displayed. 256 to match. Thus, the distance B, that is, the vertical distance B from the optical center 15 to the near-distance refraction characteristic measuring unit 16 is set. Next, set the frame F to the nose side (arrow NE
Direction)) on the table 21a of the lens table by a distance of 2 to 3 m / m corresponding to the nose side distance C.

As a result, the near-distance refraction characteristic measuring unit 16 and the optical axis O of the lens meter are aligned. In order to ensure the accuracy of the amount of movement to the nose side, the measurer can accurately adjust the amount of movement from the relative positional relationship between the target image and the reticle crosshair in the eyepiece field of view. In this way, the near refraction characteristic measuring unit 16 thus positioned measures the near dioptric power, and the near dioptric power can be obtained from the difference between this and the far dioptric power.

The above-mentioned first to fourth steps are the same as the display 2
56 to 259, that is, the case where the lens LE to be inspected is the lens with the largest market share, but if the lens to be inspected is the second lens with a market share, the indication 256 is displayed instead of the indications 256 and 258. ', 25
You can use 9 '. Further, when the lens to be inspected has a low market share, the scale 260 may be used to move the lens table according to the distances A and B announced by the manufacturer.

Since the difference in the set value of the nose side distance C between the manufacturers is smaller than that of the distances A and B, the near-distance refraction characteristic measuring section can be set on the optical axis by always moving the same distance. You can almost match. Further, when it is desired to measure the refraction characteristics of the lens at the fitting point, the lens table 21 is lowered and the lens movement position when the index line 271 is aligned with the fitting position display 258 may be measured. Second Embodiment (Structure) FIGS. 10 to 13 show a second embodiment of the present invention. The same or equivalent components as those of the above-mentioned first embodiment are designated by the same reference numerals and their description will be omitted. Omit it.

The second embodiment is an example in which a lens table moving amount setting device 25 is applied to the lever 22 for moving the lens table up and down. That is, the lever 22 is attached to one end of the shaft 300 that is rotatably supported by the bearing 2 formed in the housing 1 of the lens meter. A gear 301 is attached to the other end of the shaft 300, and rotation of the gear 301 is performed by a pinion 305 via a gear train 302, 303, 304.
Be transmitted to. The pinion 305 meshes with the rack 306 of the shaft 307 to which the lens table 21 is attached,
The rotation is converted into linear vertical movement, and the lens table 21 is moved up and down.

The inner shaft surface 220 of the lever 22 has a ring 31
The inner peripheral surface 311a of No. 1 is rotatably attached with a predetermined frictional force. Here, the predetermined frictional force means the ring 31.
The amount of frictional force required to cause the lever 22 not to rotate when gripping 1 and rotating it, and to rotate together with the lever 22 when rotating the lever 22 Is. Also, a ring 3 is attached to the housing 1.
An index cylinder 310 is formed in parallel with 11, and an index line 271 is provided on the outer peripheral surface thereof. Ring 3
Indicated on the outer peripheral surface of 11 at circumferential intervals as shown in FIG.
Scales 260 and 56 are provided on the outer peripheral surface on the opposite side. Action and Measuring Method Next, the action of the above-described second embodiment and the method of measuring the refractive characteristic of the lens to be inspected by it will be described with reference to FIGS. 14 to 25. 14, FIG. 17, FIG. 20, and FIG. 23 show the observation field of view of the eyepiece 23, respectively.

First step: The lever 22 and the frame F are moved in the same manner as in the first step of the first embodiment so that the intersection of the reticle crosshair image 23b in the eyepiece field 23a and the center of the target image 23c coincide with each other. .. Second step: Confirm that the target image 23c and the cross-shaped image 23b match each other, and as shown in FIG. 15, rotate the ring 311 to match the display 257 and the index line 271. When the lens LE to be inspected has to use a lens having a small market share, that is, the scale 260, the 0 position display 261 is aligned with the index line 271 as shown in FIG.

At this time, since the ring 311 is slidably rotated on the inner shaft surface 220 of the lever 22, the lever 22 is not rotated. Therefore, the lens table, that is, the lens to be inspected does not move. Third step: The distance measuring section display 259 provided with the ring 311 which is integrally rotated by the frictional force between the inner shaft surface 220 and the inner peripheral surface 311a of the ring 311 by rotating the lever 22.
Are aligned with index line 271 as shown in FIG.

As a result, the lens LE to be inspected descends together with the lens table 21, and the distance refraction characteristic measuring unit 13 thereof coincides with the optical axis O of the lens meter. When the scale 260 is used, if the numerical value of the distance A announced by the manufacturer of the lens under test is 6 m / m, for example, the lever 22 is rotated until the index line 271 and the scale 6 of the scale 260c match. After moving the lens to be inspected in this way, the measurement knob 24 is rotated to sharply form the target image 23c on the reticle as shown in FIG. 17, and the distance dioptric power at that time is read on the display window 23d.

Fourth Step: Next, the lever 22 is rotated so that the near-distance measuring portion display 256 provided on the ring 311 is aligned with the index line 271 as shown in FIG. Near scale 2 when using the scale 260
60a is used, for example, the distance B of the lens to be inspected is 18 m /
In the case of m, as shown in FIG. 22, the 18 scale and the index line 271 are matched.

Next, the lens is placed on the nose side of the table surface 21.
It is moved by 2 to 3 m / m on a, and is moved to a position where the target image 23c coincides with the vertical line of the cross line 23b as shown in FIG. At this position, the measurement knob 24 is rotated to sharpen the target image, and the near power at that time is read on the display window 23d. The near addition is calculated as [+1.75 − (− 1.25)] = 3.00 D from the reading value of −1.25 D in the third step and the reading value of 1.75 D in this step.

When it is necessary to measure the refraction characteristics at the fitting point in addition to the above measurement steps, the lever 22 is rotated to display the fitting position display 258 of the ring 311 on the index line 271 as shown in FIG. Match. When the scale 260 is used, for example, when the distance a is 4 m / m, the scale 260c
The index line 271 is made to coincide with the 4th scale. Rotate the measurement knob at this moving position to move the target image 2
3e is sharpened, and the frequency at that time can be read from the display window 23d. Third Embodiment (Structure) The first and second embodiments described above are examples in which the lens table moving mechanism of the conventionally known telescope type lens meter is improved, but the present invention is limited to this type of lens meter. It can also be used for so-called auto lens meters, not just things. 26 to 29 show an example of an automatic lens meter. This auto lens meter has the same structure as that commercially available as Topcon CL-1000 manufactured by Tokyo Optical Co., Ltd. For details of the measuring principle and structure, refer to JP-A-57-299933.

The light flux from the light source 401 of the measurement optical system 400 of this lens meter is made into a point light source by the aperture 402. The light flux from the aperture 402 is reflected by the mirror 40.
A collimator lens 404 forms a parallel light flux through 3 and
The light is incident on the lens LE to be measured held by the lens receiver 20 and the lens table 21. The light flux that has passed through the lens LE to be inspected is reflected by the mirror 406, and then the half mirror 40.
7, the first optical path including the mirror 409, and the half mirror 4
07, and a second optical path composed of a mirror 408.

In each of the first optical path and the second optical path, FIG.
7, as shown in FIG. 28, a large number of parallel line openings 411a,
Masks 411 and 412 having 412a are arranged. Further, the shutter 4 for switching the first optical path and the second optical path
15 are provided. The light flux selected by the mask 411 of the first optical path is divided into two by the half mirror 410 and detected by the line sensors 413 and 414, which are CCDs, respectively. On the other hand, the light flux selectively transmitted by the mask 412 of the second optical path is similarly divided into two by the half mirror 410 and detected by the line sensors 413 and 414.

The line sensors 413 and 414 are shown in FIG.
As shown in, a rectangular coordinate system is constructed. The arithmetic / control circuit 420 has a pitch P ₁ of the projection pattern 411a ′ of the mask 411 and the projection pattern 412a ′ of the mask 412,
The refraction characteristics of the lens to be tested are calculated from P ₂ and the tilt angles θ ₁ and θ _2, and the measured value is digitally displayed on the CRT display 423 via the interface circuit 421 and temporarily stored in the memory 422.

Further, as shown in FIG. 29, the prism amount is calculated from the shift amount between the center η of the quadrilateral αβγε obtained from the projection patterns 411a ′ and 412a ′ and the origin 0 (coaxial with the measurement optical axis), and the shifts are calculated. CRT display 42
3 is displayed graphically. The lens LE is aligned from this display figure 423a. Arithmetic control circuit 420
Is the marking mode switch 4 that commands the start of measurement.
31, a memory mode switch 432 for transferring the measured value to the memory 422 for storage, and an ADD mode switch 433 for instructing the near addition calculation. That is, in the third embodiment, the lens movement amount setting device 25 described in detail in the second embodiment is incorporated in this auto lens meter. Action and Measuring Method Next, the action of the third embodiment and the setting method and measuring method of the lens to be inspected based on the action of the third embodiment will be described below based on the flowchart shown in FIG.

Step 101: The marking mode switch 431 is turned on.

Step 102: The arithmetic control circuit 420 measures the amount of deviation between the optical axis of the lens under test and the optical axis O of the measuring optical system 400 (the amount of deviation between O and η in FIG. 29).

Step 103: The amount of deviation between the measuring optical axis O and the optical center 15 of the lens under test is displayed on the CRT display 423 as a display figure 423a. Display figure 423a
The cross point O of the cross line indicates the measurement optical axis, and the cross point T ₀ of the cross line target figure T indicates the optical center position of the lens under test.

Step 104: The measurer checks whether the intersection T _{0 of the} target figure and the intersection O of the cross line match, that is, whether the optical center of the lens under test and the measurement optical axis match. .. If they match, step 1
07, and when they do not match, the process proceeds to step 105.

Step 105: The measurer moves the lens to be inspected placed in the spectacle frame F while looking at the graphic display 423a of the CRT display 423, and the intersection point O and the intersection point T are moved.
Make ₀ match. At this time, in the vertical movement of the lens to be inspected, the lever 22 of the lens movement amount setting device 25 is rotated and the lower end of the spectacle frame F is moved to the lens table 21.
This is done by moving the lens table up and down while abutting on the table surface. The lateral movement of the lens to be inspected is performed by moving the spectacle frame itself left and right on the table surface 21.

Step 106: CRT display 42
When it is confirmed that the intersection O and the intersection T ₀ coincide with each other on the graphic display 423a of No. 3, the ring 311 of the setting device 25 is gripped and rotated, and the optical center display 257 (OC) provided on the outer peripheral surface thereof. To the index line 271. When using the scale 260, the 0 position display 261 of the ring and the index line 271 are matched.

Step 107: rotate the lever 22,
The distance measuring unit display 25 of the ring 311 which rotates integrally with this
9 (FAR) is matched with the index line 271. When using the scale 260, the distance scale 260c
Align the scale with the value of distance A announced by the manufacturer. As a result, the distance refraction characteristic measuring unit of the lens under test coincides with the measurement optical axis.

Step 108: The arithmetic control circuit 420 calculates the distance refraction characteristic of the lens to be inspected based on the information from the line sensors 413 and 414, and supplies the result to the CRT display 423 via the interface circuit 421. ..

Step 109: CRT display 42
3 digitally displays the measurement result, that is, the spherical power S, the cylindrical power C, the cylindrical axis angle A, and the prism amount P.

Step 110: The memory mode switch 432 is turned on. The arithmetic control circuit 432 instructs the interface circuit 421 to hold the display of the measured value of step 108 on the CRT display 423, and stores the measured value in the memory circuit 422.

Step 111: ADD mode switch 4
Turn 33 on. The arithmetic control circuit 432 operates so as to display a value obtained by subtracting the spherical power of the previous step 109 from the spherical power of the subsequent measurement result on the “ADD” display of the CRT display 423.

Step 112: The lever 22 is rotated to rotate integrally with it. Near measurement part display 25 of ring 311
6 is aligned with the index line 271. Scale 26
When 0 is used, the numerical value of the distance B announced by the manufacturer is matched with the index line 271 using the scale of the near scale 260d. As a result, the lens to be inspected is moved on the vertical line connecting the optical center and the distance refraction characteristic measuring unit, and is moved by the distance (A + B) from the position of step 108.

Step 113: The measurer wears the spectacle frame F
Hold it and move it to the nose side on the table surface 21a.

Step 114: The arithmetic control circuit 420
At step 113, the sphere value of the distance measuring unit at step 108 is subtracted from the refraction characteristic at that time, which is associated with the movement of the lens to be tested to the nose side, in particular, the spherical power, and the values are sequentially output as the near addition diopters.

Step 115: The near addition power output from step 114 is sequentially digitally displayed on the "ADD" display section of the CRT display 423 via the interface circuit 421.

Step 116: The measurer observes the change in the near addition power on the "ADD" display portion of the CRT display accompanying the movement of the lens under test on the nasal side, and moves the lens under test until the addition power becomes maximum. Move to the nose side on the table surface.

Step 117: When the near power is maximum, the near refractive property measuring section of the lens under test coincides with the measurement optical axis. The measurer turns on the memory mode switch 432 to hold the near addition power displayed on the “ADD” display on the CRT display 423, and instructs the arithmetic control circuit 420 to store the value in the memory 422. ..

In the above measurement steps, when it is desired to measure the refraction characteristics at the fitting point of the lens LE to be inspected, step 120 shown by a chain double-dashed line in FIG.
As described above, after step 106, the lever 22 is moved by rotating the lever 22 until the fitting position display 258 (PP) of the ring 311 of the moving device 25 matches the index line 271, and the lens LE is refracted at that position. The characteristic may be measured.

In recent years, progressive multifocal lenses have been subjected to prism thinning as shown in FIG. That is, if the rear refracting surface (having a spherical surface or toric surface structure) 19 is processed coaxially with the optical axis 18a of the progressive refracting surface 18 of the lens, the distance side edge thickness Δ becomes thicker and the lens becomes heavier. As a countermeasure against this, prism thinning is performed to incline the rear refracting surface 19 so that the far-side edge thickness and the near-side edge thickness are equal to each other. When the prism thinning process is performed, the optical axis 19a of the rear refracting surface 19 is inclined by θ with respect to the optical axis 18a of the progressive refracting surface.

This inclination θ of the optical axis is optically equivalent to that the lens has a prism, and if the amount of thinning processing is large, a phenomenon occurs in which the optical center is located outside the lens. The measurement method described in 30 cannot be used. The flow chart shown in FIG. 31 to be described below is a flow chart showing a method of measuring the prism-sealed lens.

Step 201: The above steps 101 to 104 are executed. However, the intersection point T ₀ may be located on the vertical line of the cross line of the graphic display 423a. That is, the prism amount in the horizontal direction should be zero.

Steps 202-205: The measurer is a CRT
The lens to be inspected is moved while observing the measured value digitally displayed on the "S" display section (representing the dioptric power) and the "C" display section (representing the cylindrical power) on the display 423, and the spherical power and the cylindrical power are minimized. The movement of the lens under test is stopped at the position. This position is used as the distance refraction characteristic measuring portion of the lens.

Step 206: The memory mode switch 432 is turned on to hold the display on the CRT display and supply the measured value to the memory circuit 422 for storage.

Step 207: Ring 3 of the mobile unit 25
11 is rotated, and the numerical value of the distance A announced by the lens manufacturer under test is matched with the index line 271 using the scale of the distance scale 260a of the scale 260 of the ring 311.

Step 208: Same as Step 111 described above.

Step 209: The near scale 260c of the ring 311 which rotates the lever 22 and rotates integrally with the lever 22.
The numerical value of the distance B announced by the lens maker to be tested is matched with the index line 271 by using the scale. The rotation of the lever 22 moves the lens under test via the lens table.

Steps 210 to 214: The same as steps 113 to 117 described above. Fourth Embodiment (Structure) FIGS. 32 and 33 show an embodiment of the nose side moving device for controlling the amount of movement of the nose side of the lens to be inspected.
It can be incorporated into the lens table 21 of the third embodiment. On the table surface 21a of the lens table 21, a slider 501 having a nose pad holding portion 500 sandwiched by the nose pad FN of the spectacle frame F or a lens frame in the vicinity thereof is slidably mounted. The slider 501 has an arm piece 502.
Is inserted into a guide groove 21b formed in the lens table 21 to guide the movement of the slider 501.

The nose pad holder 500 is a slider 5
01 is movably inserted in the axial direction of the support column 503, and the elastic force of the spring 505 inserted in the hole 504 formed in the support column 503 exerts a force in the direction of leaving the support column. A slot 506 is formed on the lower surface of the nose pad holding portion 500, and a pin 507 planted on the column 503 is fitted into the slot 506 to prevent the holding portion 500 from coming off. An index line 510 is attached to a substrate 508 of the slider 501.

On the other hand, a scale plate 511 is slidably attached to the side surface of the lens table 21, and the scale plate 511 is close to a progressive multifocal lens having a market share of 1st or 2nd. Nose side movement amount displays 512 and 513, which respectively display positions corresponding to the nose side distance C of the refraction characteristic measuring unit 16 (see FIG. 1), are provided symmetrically with the 0 scale 514 as the center. Here, the “NR” mark on the display 512 indicates “the nose side of the right-eye lens” and the display 513.
"NL" mark indicates "the nose side of the left eye lens".

Further, in the fourth embodiment, the scale plate 511 has a scale 515 for displaying the nose side movement amount so as to correspond to the measurement of any commercially available progressive multifocal lens.
have. The scale 515 is symmetric with respect to the 0 scale, and marks "R" and "L" are arranged in parallel to indicate the scale for the right eye lens or the scale for the left eye lens.

Action Steps 113 to 116 or step 210 described above
Instead of .about.213, step 600 shown by the chain double-dashed lines in FIGS. 30 and 31 is executed as follows. That is, after step 112 or step 209 is finished, first, the scale plate is moved so that the 0 position display 514 (0 scale when using the scale 515) of the scale plate 511 matches the index line 510 of the slider 501.

Next, in FIG. 32, since the lens to be inspected is the right eye lens, the frame F is moved to the right on the table surface 21a. Since the nose pad FN of the frame F moves to the right with the nose pad holding portion, the slider 501 moves to the right on the table surface 21a. The measurer moves the frame F until the index line 510 coincides with the display line of the nose-side movement display 513. As a result, the near-distance refraction characteristic measurement unit automatically matches the measurement optical axis. When the scale 515 is used, the scale on the right eye “R” side scale may be used to move by the distance C on the nose side announced by the lens manufacturer. Fifth Embodiment (Structure) FIG. 34 is a block surface showing a fifth embodiment of the lens movement amount setting means of the present invention. While the above-described first to fourth embodiments are mechanically configured lens movement amount setting means, the fifth embodiment is an electrical configuration thereof.
The structure of the lens meter body is the same as that of the third embodiment.
The mechanical structure of the lens nose side moving device is almost the same as that of the fourth embodiment, but the substrate 508 is attached with the detection head 711a and the incremental encoder 711 having a scale electrically, magnetically or optically configured. Has been.

The amount of movement of the lens to be inspected due to the lateral movement of the spectacle frame F of the nose pad holder 500 is detected by the detection head, counted by the counter circuit 709, and input to the comparison circuit 705. On the other hand, an electric, magnetic or optical rotary encoder plate 701 is fixed to a shaft 307 of a lever 700 for vertically moving a lens table for moving a lens in accordance with a vertical movement of an eyeglass frame F. The rotation amount of 307, that is, the movement amount of the lens is replaced with the rotation amount of the encoder plate 701, and the rotation amount is detected by the detection head 702, and the counter circuit 70
4 is counted and input to the comparison circuit 705.

In the comparison circuit 705, the distances A, B of various progressive multifocal lenses previously stored in the memory 707,
Of the C, a and (see FIG. 1) data, the data of one of the lenses is selected by the selector circuit 706 and input. Further, the lens distance data stored in the memory circuit 707 is displayed on the CRT display 423 via the interface circuit 421 as shown in the figure. The CRT display 423 displays the schematic diagram 720 of the lens and the distance data list 722 of various lenses.
And an index 723 for scanning the data line by line. Further, on the CRT screen of FIG. 26, an arrow mark 7 indicating the moving direction of the lens and the completion of setting is displayed.
24 is added and displayed.

The selection switch 712 is connected to the interface circuit 421 and the selector circuit 706,
The index 723 scans the distance data display line of each lens of the display 722 while the measurer turns on the selection switch 712. When the ON operation of the selection switch by the operator is released, the selector circuit 70
Reference numeral 6 denotes the cancellation command, which operates to transmit the distance data of the lens at that time to the comparison circuit 705. On the other hand, an origin switch 710 is mounted on the lens meter housing above the lever 700. This origin switch is ON
When set to 0, the counter circuit 704 acts to set the count value to zero. A CRT screen changeover switch 730 is connected to the interface circuit 421. Action and Lens Measuring Method FIG. 35 is a flowchart showing the action of the fifth embodiment and the lens measuring method based on it, which will be described in detail below.

Step 801: The steps 101 to 105 of the third embodiment described above are executed, and if the optical center of the lens to be inspected or the lens to be inspected is a prism sealing processed product, the distance refraction characteristic measuring section and the measuring optical axis. Match.

Step 802: The origin switch 712 is turned on.
Set to N. In response to the command from the switch 712, the counter circuits 704 and 709 reset the count values from the detection heads 702 and 711b up to the present time to zero.

Step 803: The CRT screen changeover switch 730 is turned on. This allows CRT display 4
23 switches the screen from the screen shown in FIG. 26 to the screen shown in FIG.

Step 804: The measurer selects the table 72 in FIG.
Maker mark 1 checked from 2
7 (see FIG. 1) or the like, the lens to be inspected is selected, the index 723 is moved on the data display of the lens according to the command of the selection switch 712, and it is superimposed on the lens data. When the lens data is selected, the selector circuit 706 transfers the distance data of the selected lens from the memory 707 to the comparison circuit 705.

Step 805: The marking mode switch 431 (FIG. 26) is turned on.

Step 806: In response to the instruction of step 805, the screen of the CRT display 423 is switched to the screen of FIG.

Step 807: The lever 700 is rotated to move the lens to be inspected so that the distance portion thereof coincides with the measurement optical axis O. At this time, the detection head 702 moves the lever 7
The rotation amount of 00, that is, the movement amount of the lens is detected, and the counter circuit 704 counts the amount. An arrow mark 724 on the counting screen indicates that the upper triangular arrow is lit and the lens is moving in that direction.

Step 808: The count result of the counter circuit 704 is input to the successive approximation circuit 705 as the lens movement amount. The comparison circuit compares the A data of the selection distance data input from the memory circuit 707 via the selector circuit 706 with the lens movement amount, and when the lens movement amount and the distance data A become equal, the arrow of the CRT display 423 is displayed. A circle mark in the middle of the mark 724 is lit to notify that the lens has moved a predetermined distance, that is, that the distance refraction characteristic measuring unit of the lens coincides with the measurement optical axis.

Step 809: The above-mentioned steps 108-
110 is executed to measure the distance refraction characteristic, and the result is held on the screen and stored in the memory 422.

Step 810: ADD mode switch 4
33 (FIG. 26) is turned on.

Step 811: The lever 700 is rotated in the opposite direction to move the lens to the near portion side. The amount of movement is detected by the detection head 702 and the counter circuit 7
The count value is counted at 04, and the count value is input to the comparison circuit.
During the movement of this lens, the lower arrow of the arrow mark 724 on the screen lights up.

Step 812: The comparison circuit 705 compares the count value from the counter circuit 704 with the selected distance data B, and when they match each other, the circle mark in the middle of the arrow mark on the screen is turned on.

Step 813: Next, the measurer moves the spectacle frame F on the table surface 21a of the lens table 21 to the nose side. The amount of movement of this lens toward the nose side is detected by the detection head 711a, and the data is counted by the counter circuit 709. During the movement of the lens to the nose side, the lateral arrow of the arrow mark 724 on the screen, and the left arrow mark in FIG. 35, which is the lens for the right eye, lights up.

Step 814: The comparison circuit 705 uses the selected distance data C from the memory circuit 707 and the counter circuit 7.
The count value from 09 is compared, and when both match, the circle mark of the arrow mark 724 is turned on. From this, it can be seen that the near-distance refraction characteristic measuring portion of the lens matches the measurement optical axis.

Step 815: Step 114 described above,
115 and 117 are executed to measure the refraction characteristics of the near-distance measurement section, the addition power is calculated from the difference from the far-distance measurement value, and the data is held on the screen and stored in the memory 422.
Memorized in.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an example of a positional relationship between respective measuring units of a progressive multifocal lens.

FIG. 2 is an explanatory diagram illustrating prism thinning processing.

FIG. 3 is an external perspective view showing a first embodiment of the lens meter of the present invention.

FIG. 4 is a front view of the lens movement amount display device according to the first embodiment.

5 is a cross-sectional view taken along the line AA ′ of FIG.

FIG. 6 is a schematic diagram for explaining an operation of the first embodiment and a measurement method based on the operation.

FIG. 7 is a schematic diagram for explaining an operation of the first embodiment and a measurement method based on the operation.

FIG. 8 is a schematic diagram for explaining an operation of the first embodiment and a measurement method based on the operation.

FIG. 9 is a schematic diagram for explaining an operation of the first embodiment and a measurement method based on the operation.

FIG. 10 is a partial sectional view showing a lens movement amount display device according to a second embodiment of the present invention.

FIG. 11 is an explanatory view showing a graduation display mode of the ring of the second embodiment.

FIG. 12 is an explanatory view showing a graduation display mode of the ring of the second embodiment.

FIG. 13 is an explanatory diagram showing a graduation display mode of the ring of the second embodiment.

FIG. 14 is an explanatory view of the operation of the second embodiment and the measuring method therefor.

FIG. 15 is an explanatory view of the operation of the second embodiment and the measuring method therefor.

FIG. 16 is an explanatory view of the operation of the second embodiment and the measuring method therefor.

FIG. 17 is an explanatory view of an operation of the second embodiment and a measuring method therefor.

FIG. 18 is an explanatory view of the operation of the second embodiment and the measuring method therefor.

FIG. 19 is an explanatory view of the operation of the second embodiment and the measuring method therefor.

FIG. 20 is an explanatory view of the operation of the second embodiment and the measuring method therefor.

FIG. 21 is an explanatory view of the operation of the second embodiment and the measuring method therefor.

FIG. 22 is an explanatory view of the operation of the second embodiment and the measuring method therefor.

FIG. 23 is an explanatory view of the operation of the second embodiment and the measuring method therefor.

FIG. 24 is an explanatory view of the operation of the second embodiment and the measuring method therefor.

FIG. 25 is an explanatory view of the operation of the second embodiment and the measuring method therefor.

FIG. 26 is an optical layout diagram showing a configuration of a lens meter according to a third embodiment of the present invention.

FIG. 27 is a plan view of the mask according to the third embodiment.

FIG. 28 is a plan view of the mask according to the third embodiment.

FIG. 29 is a schematic diagram showing the measurement principle of the third embodiment.

FIG. 30 is a flowchart showing a measuring method according to the third embodiment.

FIG. 31 is a flowchart showing a measuring method according to the third embodiment.

FIG. 32 is an external perspective view showing a nose side movement amount display device according to a fourth embodiment of the present invention.

FIG. 33 is a vertical midline cross-sectional view of FIG. 32.

FIG. 34 is a block diagram showing a fifth embodiment of the present invention.

FIG. 35 is a flow chart for explaining the operation and measuring method of the fifth embodiment.

[Explanation of symbols]

 LE Progressive multifocal lens F Eyeglass frame 20 Lens receiver O Measuring optical axis 21 Lens table 23 Lever 311 Ring 271 Index line 256 Near measuring position display 257 Optical center position display 258 Fitting position display 259 Distance measuring position display

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yukio Ikezawa 75-1 Hasunumacho, Itabashi-ku, Tokyo Topcon Co., Ltd.

Claims (1)

[Claims] 1. A lens mounting means for supporting a lens to be inspected, a lens measuring means for measuring refraction characteristics of a lens mounted on the lens mounting means, and an optical axis orthogonal to the measuring means. A lens table that comes into contact with the lens in order to restrict the range of movement of the lens mounted on the lens mounting means in the plane; and a lens movement amount detection means for measuring the movement amount of the lens table. Lens meter characterized by.