JPH06194268A - Lens meter - Google Patents

Abstract

PURPOSE:To enable accurate and efficient measurement of the refraction characteristics of a progressive multi-focus lens or a bifocal lens by providing a position-adjusting information display means that displays the completion of the adjustment of position on the basis of position information of the lens measured by means of a measuring means. CONSTITUTION:A luminous flux selected by a mask 411 of a first optical path comprising a half mirror 407 and a mirror 409 is divided into two parts by a half mirror 410 to be detected by respective line sensors 413, 414 each having a CCD. On the other hand, a luminous flux of a second optical path comprising the half mirror 407 and a mirror 408 is also divided into two parts by the half mirror 410 to be detected by the respective sensor 413, 414. An operation control circuit 420 operates the refraction characteristics of a lens to be inspected from a pitch and an inclination angle of each of projection patterns of a mask 411 and a mask 412 so that the measured value is displayed on a CRT display 423 in digital data via an interface circuit 421 as well as temporarily memorized in a memory.

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 efficiently and 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 showing the refractive power information of a lens does not show the characteristics of that lens, and it is only by using both the positional information within the lens and the refractive power information at that position that the refractive characteristics of a progressive multifocal lens or a bifocal lens Has been shown. By the way, the conventional lens meter is
For example, when the lens is moved by a predetermined distance from the optical center of the distance portion for measurement, it is necessary to determine that the lens has moved by the predetermined distance by detecting the actual movement amount of the lens.

[0003]

When measuring the refraction characteristics of a progressive multifocal lens or a bifocal lens, it is essential to accurately know the refraction characteristics of the lens and the measurement position thereof as described above. However, in the conventional lens meter, there is no means for easily and accurately measuring and displaying the completion of the movement of the lens, and it is not possible to efficiently measure the refraction characteristics of the progressive multifocal lens. There was a problem that the accuracy was also low. The present invention has been made in view of such a problem of the conventional lens meter, and measures the refractive characteristics of a progressive multifocal lens or a bifocal lens by displaying completion of movement of a predetermined amount of the lens. It is an object of the present invention to provide a lens meter that can efficiently and accurately perform.

[0004]

SUMMARY OF THE INVENTION A lens meter of the present invention for solving the above-mentioned problems is provided with a lens mounting means for supporting a lens to be tested, and a lens measurement for measuring a refraction characteristic of a lens mounted on the lens mounting means. And a positioning information display means for displaying completion of positioning based on the positional information of the lens measured by the measuring means.

[0005]

In the lens meter of the present invention, the progressive multifocal lens and the bifocal lens are provided by providing the alignment information display means for displaying the completion of the alignment based on the position information of the lens measured by the measuring means. It has an effect that the refraction characteristics of the lens can be measured efficiently and highly accurately.

[0006]

First Embodiment (Structure) FIG. 3 is a perspective view showing the outer 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 (distance between the measurement optical axis O and the table surface 21a) is changed by the lever 22 so that 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 movement amount of the lens LE to be inspected is set by the lens movement setting device 25 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 is displayed in the eyepiece visual field in association with the rotation amount.
The refractive properties of the lens can be measured from the scale. Since the refraction characteristic measuring optical system itself of this embodiment has the same configuration as a known telescope type lens meter, its description 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 0. On the display plate 255, an optical center display 257 including an "OC" display indicating an optical center position or a geometric center position and a display line, and a distance a from the optical center 15 of the lens illustrated in FIG. 1 to the fitting point 12 are shown. "PP" separated from display 257 by an equal distance
Fitting position display 258 consisting of display and display line
1 and a distance measuring section display 259 including a “FAR” display and a display line, which is separated from the display 257 by a distance equal to the distance A between the optical center 15 of the lens and the distance refraction characteristic measurement instruction mark. An "ADD" display separated from the display 257 by a distance equal to the distance B between the optical center 15 and the near-distance refraction characteristic measurement instruction mark 16 and a near-measurement portion display 256 including a display line are provided.

By the way, the distances A, B, a and the distance C on the nose side between the near-distance refraction characteristic measuring portion indication mark 16 and the optical center indication mark 15 are different for each lens maker. Therefore, in this embodiment, the displays 256 to 259 are provided according to the respective 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 available for measurement of any commercially available lens, the above-mentioned display lines 256, 256 'through 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 by the operation of the first embodiment 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 optical axis of the lens LE to be measured. The center 15 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 kept 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. And the left and right movements of the lens LE (direction of arrow RL) are adjusted by the frame F.
This is done by pushing and moving on the table surface 21a of itself with a finger.

Second step: As shown in FIG. 7, the knob 2
50 to rotate the feed screw 251 to move the moving block 252 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. This allows the lens LE
Since the optical center 15 of the lens LE is lowered by the distance A, 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 characteristic 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 and match. Thereby, 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 distance C on the nose side.

As a result, the near-distance refraction characteristic measuring unit 16 and the optical axis O of the lens meter are made to coincide with each other. 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 refractive power 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 near dioptric power. The above-mentioned first to fourth steps are a method using the indications 256 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 lens with the second market share, In this case, displays 256 'and 259' may be used instead of the displays 256 and 258. Furthermore, if the lens to be inspected has a low market share, the distance A announced by the manufacturer using the scale 260,
The lens table may be moved according to B. In addition,
The nose-side distance C has a smaller difference in set value between the manufacturers than the distances A and B, so that the near-distance refraction characteristic measuring unit can be made to substantially coincide with the optical axis simply by moving the same for the same distance.

Furthermore, at the fitting point
When you want to measure the refraction characteristics of a lens, use the lens table
21 is lowered and the index line 271 is fitted.
Of the lens when it is set to match the display position 258
It may be measured at the moving position. Second embodiment (configuration) 10 to 13 show a second embodiment of the present invention.
Then, the same or equivalent components as those of the first embodiment described above are
The same reference numerals are given and the description thereof is omitted. Second embodiment
Attach the lens table to the lever 22 for moving the lens table up and down.
This is an example in which the device movement amount setting device 25 is applied. That is,
The bar 22 is a bearing 2 formed on the housing 1 of the lens meter.
Attached to one end of a shaft 300 that is rotatably supported
Has been. A gear 301 is attached to the other end of the shaft 300.
The rotation of the gear 301 is attached to the gear trains 302, 303,
It is transmitted to the pinion 305 via 304. Pinion
305 is the shaft 3 to which the lens table 21 is attached
It meshes with the rack 306 of No. 07, and makes its rotation a straight up and down movement.
After conversion, the lens table 21 is moved up and down. Lever 2
The inner peripheral surface 311a of the ring 311 is
It is rotatably inserted with a predetermined frictional force. here
With a predetermined friction force, the ring 311 is gripped and rotated.
When it rolls, it does not rotate the lever 22,
When rotating the -22, rotate it together with the lever 22.
The amount of frictional force required to make it act like rolling
Is. In addition, the case 1 has an index in parallel with the ring 311.
Box 310 is formed, and an index line is formed on the outer peripheral surface thereof.
271 is applied. The outer peripheral surface of the ring 311 is shown in FIG.
Indications 256 to 259 are displayed at circumferential intervals as shown in Fig. 3.
A scale 260 is applied to the outer peripheral surface on the opposite side.
It (Action and measurement method) Next, based on FIG. 14 to FIG.
The operation of the second embodiment described above and the bending of the lens under test
The method for measuring the folding property will be described. In addition, here in FIG.
4, FIG. 17, FIG. 20, and FIG.
The observation field of view is shown.

First step: The lever 22 and the frame F are moved in the same manner as 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 crosshair 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 unit 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 manner, 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 moved to the nose side on the table surface 21a by 2 to 3 m / m, and
As shown in, the target image 23c is moved to a position that matches the vertical line of the cross hair 23b. Measurement knob 2 at this position
4 is rotated to make the target image sharp, and the near dioptric power at that time is read on the display window 23d. 3rd degree for near vision
From the step reading value -1.25D and this step reading value + 1.75D, [+1.75-(-1.25)] = 3.
Calculated as 00D. If 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 align the fitting position display 258 of the ring 311 with the index line 271 as shown in FIG. When the scale 260 is used, for example, when the distance a is 4 m / m, the index line 271 is made to coincide with the 4th scale of the scale 260c. The measurement knob is rotated at this moving position to sharpen the target image 23e, and the frequency at that time is displayed on the display window 2
Read from 3d. 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 the 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 measuring 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 beam through 3,
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.
As shown in FIGS. 27 and 28, masks 411 and 412 having a large number of parallel line openings 411a and 412a are arranged in the first optical path and the second optical path, respectively. A shutter 415 that switches between the first optical path and the second optical path is provided. The light flux selected by the mask 411 of the first optical path is divided into two by the half mirror 410, and each is divided by the CCD.
Are detected by line sensors 413 and 414.
On the other hand, the light flux selectively transmitted by the mask 412 on the second optical path is similarly divided into two by the half mirror 410 and detected by the line sensors 413 and 414. Line sensor 41
As shown in FIG. 29, 3, 414 form an orthogonal coordinate system. The arithmetic / control circuit 420 uses the projection pattern 411 a ′ of the mask 411 and the projection pattern 41 of the mask 412.
The refraction characteristics of the lens to be measured are calculated from the pitches P ₁ and P ₂ and the inclination angles θ ₁ and θ _{2 of} 2a ′, and the measured values are digitally displayed on the CRT display 423 via the interface circuit 421 and stored in the memory 422. Memory temporarily.

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. ( Operation and Measuring Method ) Next, the operation of the third embodiment and the setting method and measuring method of the lens to be inspected based on the operation will be described below with reference to the flowchart shown in FIG. Step 101: Set the marking mode switch 431 to O
Set to N. Step 102: The arithmetic control circuit 420 shifts the optical axis of the lens to be measured from the optical axis O of the measurement optical system 400 (O in FIG. 29).
And the deviation amount of η) are measured.

Step 103: The amount of deviation between the measurement 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 intersection O of the cross line indicates the measurement optical axis, and the intersection T ₀ of the cross target graphic T indicates the optical center position of the lens to be inspected. Step 104: The measurer determines the intersection T _{0 of the} target figure.
And the cross line intersection O are matched, that is, whether the optical center of the lens to be tested and the measurement optical axis are matched is checked. If they match, the process proceeds to step 107, and if 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 so that the intersection point O and the intersection point T ₀ coincide with each other. At this time, the vertical movement of the lens under test is
This is done by rotating the lever 22 of the lens movement amount setting device 25 and moving the lens table up and down while the lower end of the spectacle frame F is in contact with the table surface of the lens table 21. 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 point O and the intersection point T ₀ coincide with each other in 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 zero position display 261 of the ring and the index line 271 are aligned. Step 107: The lever 22 is rotated, and the distance measuring unit display 259 (FAR) of the ring 311 which rotates integrally with the lever 22.
With the index line 271. Scale 260
When using, adjust the scale of distance scale 260c to the value of distance A announced by the manufacturer. As a result, the distance refraction characteristic measuring portion 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 the result is calculated by the interface circuit 42.
1 to the CRT display 423. Step 109: The CRT display 423 digitally displays the measurement results, 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 and 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: Turn on the ADD mode switch 433. 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: rotate the lever 22 and rotate integrally with it. The near measurement display 256 of the ring 311 is aligned with the index line 271. When the scale 260 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 a vertical line connecting the optical center and the distance refraction characteristic measuring unit, and is moved by a distance (A + B) from the position of step 108. Step 113: The measurer holds the spectacle frame F and moves it to the nose side on the table surface 21a.

Step 114: The arithmetic control circuit 420
At step 113, the chromaticity value of the distance measuring unit at step 108 is subtracted from the refraction characteristics at that time accompanying the movement of the lens to be examined toward the nose side, in particular, the spherical power, and the values are sequentially output as the near addition powers. 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 of the near addition power of the “ADD” display portion of the CRT display accompanying the movement of the test lens on the nose side, and places the test lens on the table surface until the addition power becomes maximum. Move to the nose side with. Step 117: When the near-distance addition power reaches the maximum, the near-distance refraction characteristic measuring unit of the lens under test coincides with the measurement optical axis.
The measurer turns on the memory mode switch 432 and C
The near addition power displayed in the “ADD” display section on the RT display 423 is held and the memory 4
The arithmetic control circuit 420 is instructed to store the value in 22. In the above measurement steps, the lens LE
If it is desired to measure the refraction characteristics at the fitting point of the moving device 25, after the step 106, the ring 3 of the moving device 25 is measured, as in step 120 indicated by a chain double-dashed line in FIG.
The lever 22 is rotated to move the lens LE to be inspected until the fitting position display 258 (PP) of 11 coincides with the index line 271, and the refraction characteristic at that position 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, which leads to weighting of the lens. 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 this 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 a phenomenon in which the optical center is located outside the lens occurs when the amount of thinning processing is large. The measurement method used is not available. The flow chart shown in FIG. 31 described below is a flow chart showing a method for measuring the lens subjected to the prism thinning process. Step 201: Step 101 to Step 1 described above
Execute 04. However, the point of intersection T ₀ is displayed graphically 423a.
It may be located on the vertical line of the crosshairs. 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 a distance refraction characteristic measuring portion of the lens. Step 206: Turn on the memory mode switch 432.
Then, the display on the CRT display is held and the measured value is supplied to the memory circuit 422 to be stored. Step 207: The ring 311 of the moving device 25 is rotated, and the distance scale 26 of the scale 260 of the ring 311 is rotated.
Distance A announced by the lens manufacturer under test using a scale of 0a
The numerical value of is matched with the index line 271. Step 208: Same as step 111 described above. Step 209: The lever 22 is rotated, and the numerical value of the distance B announced by the lens maker to be tested is matched with the index line 271 using the scale of the near scale 260c of the ring 311 which rotates integrally with the lever 22. This lever 22
The rotation of moves the lens to be inspected through 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 a 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 between 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 holding portion 500 is a column 503 of the slider 501.
Is movably attached to the column in the axial direction of the column.
The elastic force of the spring 505 inserted in the hole 504 formed in the shaft receives a force in the direction of coming out of the column. A slot 506 is formed on the lower surface of the nose pad holding portion 500, and the pin 50 planted on the support column 503 is inserted into the slot 506.
7 is inserted to prevent the holding portion 500 from coming off. An index line 510 is provided on the substrate 508 of the slider 501.
Is attached.

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 the first or second largest market share. 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 around the 0 scale 514. 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 nasal side movement amount so as to correspond to the measurement of any commercially available progressive multifocal lens. This scale 515 is symmetric about the 0 scale, and marks "R" and "L" are arranged in parallel to indicate whether it is the scale for the right eye lens or the scale for the left eye lens. (Act) in place of the aforementioned steps 113 to 116 or step 210 to 213, the steps 600 shown by a two-dot chain line in FIGS. 30 and 31 are performed as follows.
That is, after step 112 or step 209 is completed, first, the 0 position display 514 (scale 5) of the scale plate 511 is displayed.
When 15 is used, the scale plate is moved so that the 0 scale is aligned with 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 along 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 is aligned 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 using the scale 515, the scale on the right eye “R” side scale may be used to move the scale 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.
Further, the mechanical configuration 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 an electrically, magnetically or optically configured scale. 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 a spectacle 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 data of any one of the distances A, B, C, a (see FIG. 1) of the various progressive multifocal lenses stored in the memory 707 in advance is selected by the selector circuit 706. Has been entered. 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 display on the CRT display 423 includes a schematic diagram 720 of the lens, a distance data list 722 of various lenses, and an index 723 that scans the data row by row. Also,
On the CRT screen of FIG. 26, an arrow mark 724 indicating the moving direction of the lens and setting completion is additionally 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. ( Operation and Lens Measuring Method ) FIG. 35 is a flowchart showing the operation 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 unit and the measurement optical axis are made to coincide. .

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: Turn on the CRT screen changeover switch 730.
To As a result, the CRT display 423 switches its screen from the screen shown in FIG. 26 to the screen shown in FIG. Step 804: The measurer selects from the table 722 of FIG.
The lens to be inspected is selected with reference to the manufacturer's mark 17 (see FIG. 1) which has been checked in advance, and the index 723 is moved on the data display of the lens according to the instruction of the selection switch 712 to be 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: CRT in response to the instruction of step 805
The screen of the 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 is the memory circuit 7 via the selector circuit 706.
The data A of the selected distance data input from 07 and the lens movement amount are compared, and when the lens movement amount and the distance data A become equal, the circle mark in the middle of the arrow mark 724 of the CRT display 423 is turned on. , Informing 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 steps 108 to 110 are 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 433 (see FIG. 2)
Turn on 6).

Step 811: The lever 700 is rotated in the opposite direction to move the lens toward 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 is the counter circuit 704.
And the selected distance data B are compared, and when they match, 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 thereof. The amount of movement of this lens to the nose side is the detection head 711.
The data is detected by a 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 is the memory circuit 707.
The selected distance data C from the counter circuit 709 is compared with the count value from the counter circuit 709, and when both match, the circle mark of the arrow mark 724 is turned on. It can be seen from this that the near-distance refraction characteristic measuring portion of the lens coincides with 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 the 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 diagram 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 the operation of the second embodiment and the 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 the 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.

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 spectacle 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 a refraction characteristic of a lens mounted on the lens mounting means, and a lens measured by the measuring means. A lens meter, comprising: a position alignment information display means for displaying completion of position alignment based on position information.