JP2577700B2 - Lens meter - Google Patents

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 for measuring the refraction characteristics of a test lens placed in an eyeglass frame.

[0002]

2. Description of the Related Art After placing a lens in a spectacle frame, as one of inspections for judging whether or not the spectacle is completed according to a predetermined prescription, the spectacle frame is detected by detecting the positional relationship between the optical center of the lens. There is a need to. Conventionally, in order to detect this positional relationship, a mark is provided in advance at the optical center of the lens or the like, and a skilled worker measures the distance from the edge of the spectacle frame to the mark using a ruler.

[0003]

However, it is troublesome to previously provide a mark at the optical center of the lens, and the measurement via the mark has a high possibility of lowering the accuracy. Further, the measurement of the distance from the edge of the spectacle frame to the above-mentioned mark by a skilled worker using a ruler has a limit in the accuracy thereof, and there is also a problem in the required time.
The present invention has been made in view of such a problem of the conventional lens meter, and efficiently and highly accurately measures a refractive characteristic of a test lens placed in an eyeglass frame by a simple operation without skill. It is an object of the present invention to provide a lens meter capable of measuring the temperature of a lens.

[0004]

SUMMARY OF THE INVENTION The present invention, which solves the above-mentioned problems, comprises a lens measuring means for measuring the refraction characteristic of a lens to be inspected placed in a spectacle frame, and a single unit for regulating the left-right direction at the center of the spectacle frame. An eyeglass frame regulating member,
A lens meter comprising: a spectacle frame position detecting means for detecting a position of the spectacle frame regulating member.

[0005]

According to the lens meter of the present invention, there is provided a lens measuring means for measuring the refraction characteristics of the test lens placed in the spectacle frame, a single spectacle frame restricting member for restricting the spectacle frame, A lens meter including eyeglass frame position detecting means for detecting the position of the eyeglass frame regulating member is configured, whereby the position of the test lens placed in the eyeglass frame by a simple operation that does not require skill can be efficiently performed. This has the effect that it is possible to perform detection with high accuracy and accuracy.

[0006]

According to the lens meter of the present invention, there is provided a lens measuring means for measuring the refraction characteristics of the lens to be inspected placed in the spectacle frame, and a single unit for regulating the horizontal direction at the center of the spectacle frame. A lens meter is provided with a spectacle frame regulating member and a spectacle frame position detecting means for detecting the position of the spectacle frame regulating member, whereby a lens placed in the spectacle frame by a simple operation without skill is required. This has the effect that the position of the inspection lens can be detected efficiently and with high accuracy.

FIGS. 4 and 5 are partially enlarged views showing the configuration of the lens movement amount setting device 25. FIG. The lens moving amount setting device 25 includes a feed screw 251 having a knob 250, and a moving block 25 which 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 shown by 53a
And the plate substrate 25 fixed to the moving block 252
4. Display plate 255 adhered on substrate 254 and index plate 27 attached to lens table 21
0. The display plate 255 has an optical center display 257 including an “OC” display indicating the optical center position or the geometric center position and a display line, a distance a from the optical center 15 of the lens illustrated in FIG. "PP" separated from display 257 by an equal distance
Fitting position display 258 consisting of display and display line
1, a distance measurement unit display 259 consisting of a display line and a “FAR” display separated from the display 257 by a distance equal to the distance A between the optical center 15 of the lens of FIG. 1 and the distance refractive characteristic measurement instruction mark; Are provided from the display 257 by a distance equal to the distance B between the optical center 15 and the near refractive index measurement instruction mark 16 and a near measurement display 256 consisting of display lines.

The distances A, B, and a, and the nasal distance C between the near-refractive-characteristic-measuring unit indicating mark 16 and the optical center indicating mark 15 are different for each lens manufacturer. Therefore, in this embodiment, the display 256 to 259 is displayed according to each distance value of the lens having the highest market share. In order to further improve the convenience of the user of the present lens meter, in this embodiment, the second distance measuring unit display line 259 'and the second near distance are set in accordance with the distance value of the lens having the second largest market share. Measuring unit display line 25
6 'is given in a color different from the first display lines 256, 259 (for example, 256, 259 are black, 256', 259 'are green). Further, in order to use this lens meter for measurement of any commercially available lens, the display plate 255 has the above-mentioned display lines 256, 256 'through 25'.
A scale 260 is provided in parallel with the 8,258 'arrangement. The scale 260 has its 0 position 261 at the same position as the optical center display 257, and the near scale 260
a, the distance scale 260b is displayed in a different color on the lower side (for example, the distance scale is black and the near scale is red), and the "N" mark 2 indicating this is displayed on the near scale.
60c, and the “F” mark 260d indicating this is attached to the distance scale.

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 to face the display plate 255. The index plate 270 is provided with an index line 271. ( Operation and Measuring Method ) Next, the operation of the first embodiment and the method of measuring the amount of movement of the lens at the time of measuring the lens to be inspected will be described with reference to FIGS. First step: As shown in FIG. 6, the measurer aligns the test lens with a known lens meter, that is, by matching the optical center of the lens with the measurement optical axis of the lens meter, thereby obtaining the optical characteristics of the test lens LE. 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 vertical movement (in the direction of the arrow UD) of the lens LE is performed by the rotation of the lever 22. The movement of the lens LE in the left and right direction (in the direction of the arrow RL) is adjusted by the frame F.
This is performed by pushing with a finger on its own table surface 21a.

Second step: As shown in FIG.
50, the feed screw 251 is rotated, and the moving block 252 is moved to display the optical center 2 on the display plate 255.
The indicator 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 get away from it. Then, the lens is lowered until the display line of the distance measurement display 259 of the display plate 255 matches the index line 271 of the index plate 270. This allows the lens LE
Since the optical center 15 of the lens LE is lowered by the distance A, the distance refractive 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 refraction characteristic of the lens is measured by the same method as that of a known lens meter, and the measured value is used as the distance power. Fourth step: As shown in FIG. 9, the lever 22 is rotated to raise the lens table 21 and raise the lens LE, and the index line 271 of the index plate 270 and the near measurement display on the display plate 255 are displayed. 256. Thus, the distance B, that is, the vertical distance B from the optical center 15 to the near-refractive characteristic measuring unit 16 was set. Next, the frame F is placed on the nose side (arrow NE).
) On the lens table 21a by a distance of 2 to 3 m / m corresponding to the nose-side distance C.

As a result, the near refractive index measuring section 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 movement amount to the nose side, the measurer can accurately adjust the movement amount based on the relative positional relationship between the target image in the eyepiece visual field and the reticle crosshair. In this manner, the located near refractive power measuring section 16 measures the near power, and can determine the near power from the difference between the near power and the far power. The above first to fourth steps are the method using the display 256 to 259, that is, the case where the lens LE to be tested is the first lens in the market share. In this case, the display 256 ', 259' may be used instead of the display 256, 258. Further, when the lens to be inspected has a low market share, the distance A, which is announced by the manufacturer using the scale 260,
The lens table may be moved in accordance with B. In addition,
Since the difference in the set value of the nose side distance C between the manufacturers is smaller than the distances A and B, the near refractive index measurement unit can be made substantially coincident with the optical axis only by always moving the nose side distance C by almost the same amount of movement.

Further, at the fitting point
To measure the refraction characteristics of the lens, use the lens table
21 is lowered and the index line 271 is fitted.
Of the lens when matched with the
What is necessary is just to measure at a moving position. Second embodiment (configuration) 10 to 13 show a second embodiment of the present invention.
Then, the same or equivalent components as those in the first embodiment described above include
The same reference numerals are given and the description is omitted. Second embodiment
Is the lens table on the lever 22 for raising and lowering the lens table.
This is an example in which a moving amount setting device 25 is provided. That is,
The bar 22 is a bearing 2 formed on the housing 1 of the lens meter.
Attach to one end of shaft 300 which is rotatably supported
Have been. A gear 301 is provided at the other end of the shaft 300.
The rotation of the gear 301 is performed by the gear trains 302, 303,
It is transmitted to the pinion 305 via 304. Pinion
305 is a shaft 3 on which the lens table 21 is mounted.
07 rack 306, and the rotation is linear up and down movement.
After the conversion, the lens table 21 is moved up and down. Lever 2
2 has an inner peripheral surface 311 a of the ring 311.
It is rotatably inserted with a predetermined frictional force. here
The predetermined friction force is obtained by gripping the ring 311 and rotating it.
When turned, the lever 22 does not rotate,
-22 is rotated together with the lever 22 when it is rotated.
The amount of friction required to make it roll
It is. In addition, the housing 1 is indexed in parallel with the ring 311.
The casing 310 is formed, and an index line is
271 is applied. FIG. 1 shows the outer peripheral surface of the ring 311.
Display 256 to 259 at circumferential intervals as shown in Fig. 3
A scale 260 is provided on the outer peripheral surface on the opposite side.
You. (Action and measurement method) Next, based on FIGS.
The operation of the above-described second embodiment and the bending of the test lens
The folding characteristic measuring method will be described. Here, 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 of the eyepiece visual field 23a and the center of the target image 23c coincide. . Second step: The coincidence between the target image 23c and the crosshair image 23b is confirmed, and the display 257 and the index line 271 are made to coincide by rotating the ring 311 as shown in FIG. When the test lens LE needs to use a lens having a small market share, that is, the scale 260, the zero position display 261 is matched 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 measurement section display 259 with the ring 311 attached thereto, which is rotated by the frictional force between the inner shaft surface 220 and the inner peripheral surface 311 a of the ring 311 by rotating the lever 22.
Are matched with the index line 271 as shown in FIG. As a result, the test lens LE descends together with the lens table 21, and the distance refractive 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 to be inspected is, for example, 6 m / m, the lever 22 is rotated until the index line 271 matches the scale 6 of the scale 260c. After moving the test lens in this manner, the measurement knob 24 is rotated to form a target image 23c sharply on the reticle as shown in FIG. 17, and the distance power at that time is read through the display window 23d.

Fourth step: Next, the lever 22 is rotated, and the near measurement display 256 on the ring 311 is matched with the index line 271 as shown in FIG. Near scale 2 when using scale 260
60a, for example, the distance B of the test lens is 18 m /
In the case of m, the scale of 18 and the index line 271 are matched as shown in FIG. Next, the lens is moved to the nose side by 2 to 3 m / m on the table surface 21a.
As shown in (5), the target image 23c is moved to a position that matches the vertical line of the cross line 23b. Measuring knob 2 at this position
4 is rotated to sharpen the target image, and the near power at that time is read through the display window 23d. The near addition is the third
From the read value of the step -1.25 D and the read value of this step +1.75 D, [+1.75-(-1.25)] = 3.
00D is calculated. If it is necessary to measure the refraction characteristic at the fitting point in addition to the above measurement steps, the lever 22 is rotated to make the fitting position display 258 of the ring 311 coincide 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 four scales of the scale 260c. The measurement knob is rotated at this movement position to sharpen the target image 23e, and the frequency at that time is displayed on the display window 2.
What is necessary is just to read from 3d. Third Embodiment (Structure) The first and second embodiments described above are examples in which the lens table moving mechanism of a conventionally known telescopic 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. 26 to 29 show an example of an auto lens meter. This auto lens meter has the same configuration as that marketed as Topcon CL-1000 manufactured by Tokyo Kogaku Kikai Co., Ltd. For details of the measurement principle and configuration, see Japanese Patent Application Laid-Open No. 57-299933.

The light beam from the light source 401 of the measuring optical system 400 of this lens meter is converted into a point light source by an aperture 402. The light beam from the aperture 402 is reflected by the mirror 40
The collimator lens 404 passes through 3 to form a parallel light beam,
The light enters the lens LE to be measured held by the lens receiver 20 and the lens table 21. The light beam transmitted through the test lens LE is reflected by the mirror 406, and then reflected by the half mirror 40.
7, a first optical path including a mirror 409 and a half mirror 4
07 and a second optical path including 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 each of the first optical path and the second optical path. Further, a shutter 415 for switching between the first optical path and the second optical path is provided. The light beam selected by the mask 411 on the first optical path is split into two by a half mirror 410,
Are detected by the line sensors 413 and 414.
On the other hand, the light beam selectively transmitted by the mask 412 in the second optical path is similarly split into two by the half mirror 410 and detected by the line sensors 413 and 414. Line sensor 41
Reference numerals 3 and 414 form an orthogonal coordinate system as shown in FIG. The arithmetic and control circuit 420 calculates 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.

As shown in FIG. 29, the amount of prism is calculated from the amount of deviation between the center η of the quadrangle αβγε obtained from the projection patterns 411a ′ and 412a ′ and the origin 0 (coaxial with the measurement optical axis), and the deviation is calculated. Amount is CRT display 42
3 is displayed as a graphic. The alignment of the lens LE is performed from the display graphic 423a. Arithmetic control circuit 420
Has a marking mode switch 4 for instructing the start of measurement.
31, a memory mode switch 432 for transferring the measured value to the memory 422 and storing it therein, and an ADD mode switch 433 for instructing near addition calculation are connected. 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 test lens based on this 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 determines the amount of deviation between the optical axis of the lens to be measured and the optical axis O of the measuring optical system 400 (O in FIG. 29).
And η).

Step 103: The amount of deviation between the measurement optical axis O and the optical center 15 of the lens to be inspected is displayed on the CRT display 423 as a display figure 423a. Display figure 423a
Crosshairs intersection O represents the measurement optical axis, the intersection point T ₀ of the crosshairs target graphic and T is the optical center position of the lens. Step 104: The measurer determines the intersection T _{0 of the} target figure.
It is checked whether or not and the cross line intersection O coincide with each other, that is, whether or not the optical center of the lens to be measured coincides with the measurement optical axis. If they match, the process proceeds to step 107. If they do not match, the process proceeds to step 105. Step 105: the measurer moves the subject lens which is placed in an eyeglass frame F while viewing the graphical display 423a of the CRT display 423, the intersection O and the intersection T ₀ is so conform. At this time, the vertical movement of the test lens
This is performed 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 left-right movement of the test lens is performed by moving the spectacle frame itself left and right on the table surface 21.

Step 106: CRT display 42
Once sure that the intersection O and the intersection T ₀ is met in the third graphical display 423a, rotates it by gripping the ring 311 of the setting device 25, a display optical center is subjected on its outer peripheral surface 257 (OC) To the index line 271. When using the scale 260, the 0 position display 261 of the ring is matched with the index line 271. Step 107: The lever 22 is rotated, and the distance measurement display 259 (FAR) of the ring 311 that rotates integrally with the lever 22 is displayed.
With the index line 271. Scale 260
Is used, the scale of the distance scale 260c is adjusted to the value of the distance A announced by the manufacturer. Thereby, the distance refraction characteristic measuring unit of the test lens coincides with the measurement optical axis. Step 108: The arithmetic control circuit 420 calculates the distance refractive characteristic of the lens to be inspected based on the information from the line sensors 413 and 414, and outputs the result to 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 in step 108 on the CRT display 423, and causes the memory circuit 422 to store the measured value. Step 111: The ADD mode switch 433 is turned ON. The arithmetic control circuit 432 operates 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 part display 256 of the ring 311 is matched with the index line 271. When using the scale 260, 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 test lens is moved on a vertical line connecting the optical center and the distance refraction characteristic measuring unit, and moves from the position of step 108 by a distance (A + B). 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 value of the sphericity of the distance measuring unit at step 108 is subtracted from the refraction characteristic at that time, particularly the sphericity, which accompanies the movement of the lens to the nose side, and is sequentially output as the near addition power. Step 115: The near add 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 add power on the “ADD” display section of the CRT display accompanying the nose side movement of the test lens, and places the test lens on the table surface until the add power becomes maximum. To move in the nose direction. Step 117: When the near addition power is maximized, the near-refractive characteristic measuring unit of the lens to be measured coincides with the measurement optical axis.
The measurer turns on the memory mode switch 432 and
While holding the near addition power indicated on the “ADD” display section on the RT display 423,
22 is instructed to the arithmetic control circuit 420 to store the value. In the above measurement steps, when it is desired to measure the refraction characteristics at the fitting point of the test lens LE, as in step 120 shown by a two-dot chain line in FIG.
After step 106, the lever 22 is rotated to move the lens LE under test until the fitting position display 258 (PP) of the ring 311 of the moving device 25 matches the index line 271, and the refraction characteristics at that position are measured. I just need.

In recent years, progressive multifocal lenses have been subjected to prism-sealing as shown in FIG. That is, if the rear refracting surface (having a spherical 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 increases, leading to an increase in the weight of the lens. As a countermeasure against this, prism backing is performed by tilting the rear refraction surface 19 so that the far edge and the near edge have the same thickness d. By performing the prism sealing, 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. The inclination θ of the optical axis is optically equivalent to the lens having a prism, and if the amount of the seaming processing is large, a phenomenon that the optical center is located outside the lens occurs. Measurement method is not available. The flowchart shown in FIG. 31 described below is a flowchart showing a method for measuring the lens subjected to the prism-sealing processing. Step 201: Step 101 to Step 1 described above
Execute 04. However, the intersection point T ₀ is the graphic display 423a
It may be located on the vertical line of the crosshair. That is, the amount of prism in the horizontal direction only needs to be zero.

Steps 202-205: The measurer is a CRT
The lens to be inspected is moved while watching the measured value digitally displayed on the “S” display section (representing the facing 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 test lens is stopped at the position where. This position is used as a distance refraction characteristic measuring unit 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 and 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 using the scale of 0a
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 inspected is matched with the index line 271 using the scale of the near scale 260c of the ring 311 which rotates together with the lever 22. This lever 22
The lens to be measured is moved via the lens table by the rotation of.

Steps 210 to 214: Same as steps 113 to 117, respectively. Fourth Embodiment (Configuration) FIGS. 32 and 33 show an embodiment of a nose-side moving device for controlling the nose-side moving amount of the lens to be inspected.
In addition, it can be incorporated in 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 a nose pad FN of an eyeglass frame F or a lens frame near the nose pad FN is slidably mounted. The slider 501 has an arm piece 502.
Is inserted into the guide groove 21b formed in the lens table 21 to guide the movement of the slider 501. The nose pad holder 500 is a support 503 of the slider 501.
Is mounted so as to be movable in the support axis direction,
The spring 505 inserted in the hole 504 formed in the hole 504 applies a force in a direction to pull out from the support. A slot 506 is formed on the lower surface of the nose pad holding portion 500, and the pin 50 implanted in the column 503 is formed in 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 mounted on the side surface of the lens table 21. The scale plate 511 is located near the progressive multifocal lens having the first or second largest market share. The nose-side movement amount displays 512 and 513 for displaying positions corresponding to the nose-side distance C of the refraction characteristic measuring section 16 for use (see FIG. 1) are provided symmetrically about the zero scale 514. Here, the “NR” mark in the display 512 indicates “the nose side of the right eye lens” and the display 513
Mark “NL” indicates “the nose side of the left eye lens”. In the fourth embodiment, the scale plate 511 has a scale 515 for displaying the nose-side movement amount so as to be able to correspond to the measurement of any commercially available progressive multifocal lens. The scale 515 is scaled symmetrically with respect to the 0 scale, and has marks “R” and “L” for indicating whether it is a scale for the right eye lens or a 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 the end of step 112 or step 209, first, the 0 position display 514 (scale 5) of the scale plate 511 is performed.
The scale plate is moved so that “0 scale when using 15” matches the index line 510 of the slider 501.

Next, in FIG. 32, since the lens to be inspected is a right-eye lens, the frame F is moved rightward on the table surface 21a. Since the nose pad FN of the frame F moves rightward with the nose pad holding portion, the slider 501 moves rightward on the table surface 21a. The measurer moves the frame F until the index line 510 matches the display line of the nose-side movement display 513. As a result, the near refractive index measuring unit automatically matches the measurement optical axis. When using the scale 515, the scale may be moved by the nose-side distance C announced by the lens maker to be tested using the scale of the right eye "R" side scale. Fifth Embodiment (Configuration) FIG. 34 is a block diagram 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 configured electrically.
The configuration of the lens meter body is the same as that of the third embodiment.
The mechanical configuration of the lens nose side moving device is almost the same as that of the fourth embodiment, except that the detection head 711a and the incremental encoder 711 having an electrically, magnetically or optically configured scale are attached to the substrate 508. Have 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 electrical, 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 the lens in accordance with the vertical movement of the spectacle frame F. The rotation amount of the lens 307, that is, the movement amount of the lens is replaced by the rotation amount of the encoder plate 701, and the rotation amount is detected by the detection head 702, and the counter circuit 70
It is counted at 4 and input to the comparison circuit 705. In the comparison circuit 705, data of any one of the distances A, B, C, and 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. The lens distance data stored in the memory circuit 707 is displayed on the CRT display 423 via the interface circuit 421 as illustrated. The display on the CRT display 423 includes a schematic diagram 720 of a lens, a distance data list 722 of various lenses, and an index 723 for scanning data line by line. Also,
An arrow mark 724 indicating the direction in which the lens is moving and the completion of the setting is additionally displayed on the CRT screen in FIG.

The selection switch 712 is connected to the interface circuit 421 and the selector circuit 706.
While the operator turns on the selection switch 712, the index 723 scans the distance data display line for each lens of the display 722. When the ON operation of the selection switch by the measurer is released, the selector circuit 70
Reference numeral 6 denotes a release command, which operates to transmit 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
Then, it acts to set the count value of the counter circuit 704 to zero. The 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 a lens measuring method based thereon, which will be described in detail below. Step 801: Steps 101 to 105 of the third embodiment described above are executed, and when the optical center of the lens to be inspected or the lens to be inspected is a prism-sealed product, the distance refraction characteristic measuring unit and the measurement optical axis are made to coincide. .

Step 802: Origin switch 712 is set to O
Set to N. The counter circuits 704 and 709 reset the count values from the detection heads 702 and 711b up to the present time to zero according to the command of the switch 712. Step 803: Turn on the CRT screen switch 730
To Thereby, 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 in FIG.
A lens to be inspected is selected with reference to the maker mark 17 (see FIG. 1) checked in advance, and the index 723 is moved on the data display of the lens by a command 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 receiving command 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 of the lens coincides with the measurement optical axis O. At this time, the detection head 702 is
The amount of rotation of 00, that is, the amount of movement of the lens is detected, and the counter circuit 704 counts the amount. The arrow mark 724 on the counting screen indicates that the lens is moving in the direction indicated by the upper triangle arrow. Step 808: The count result of the counter circuit 704 is input to the successive approximation circuit 705 as a lens movement amount. The comparison circuit is connected to the memory circuit 7 via the selector circuit 706.
The A data of the selected distance data input from 07 is compared with the lens movement amount. When the lens movement amount and the distance data A become equal, the circle mark in the middle of the arrow mark 724 on the CRT display 423 is turned on. In addition, it informs that the movement of the lens has moved a predetermined distance, that is, that the distance refractive characteristic measuring unit of the lens coincides with the measurement optical axis. Step 809: The steps 108 to 110 described above are executed, the distance refractive characteristic is measured, and the result is held on the screen and stored in the memory 422. Step 810: ADD mode switch 433 (FIG. 2)
6) Turn ON.

Step 811: The lever 700 is rotated in the opposite direction to move the lens toward the near portion. The amount of movement is detected by the detection head 702 and the counter circuit 7
It is counted at 04, and the counted value is input to the comparison circuit.
During the movement of the 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
Is compared with the selected distance data B, 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 to the nose side on the table surface 21a of the lens table 21. The amount of movement of the lens toward the nose is determined by the detection head 711.
a, and the data is counted by the counter circuit 709. During the movement of the lens to the nose side, the horizontal arrow of the arrow mark 724 on the screen is lit, and in the case of FIG. 35, the left arrow mark is lit because the lens is for the right eye. Step 814: The comparison circuit 705 is the memory circuit 707
Is compared with the count value from the counter circuit 709, and when they match, the circle mark of the arrow mark 724 is lit. This indicates that the near-refractive characteristic measuring section of the lens coincides with the measurement optical axis.

Step 815: Step 114 described above,
Steps 115 and 117 are executed to measure the refraction characteristics of the near measurement unit, calculate the addition power from the difference from the distance measurement value, hold the data on the screen, and store the data in the memory 422.
Is stored.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram for explaining prism seaming 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 of the first embodiment.

FIG. 5 is a sectional view taken along line AA ′ of FIG. 4;

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

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

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

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

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

FIG. 11 is an explanatory view showing a scale display mode of a ring according to a second embodiment.

FIG. 12 is an explanatory diagram showing a scale display mode of a ring according to a second embodiment.

FIG. 13 is an explanatory diagram showing a scale display mode of a ring according to a second embodiment.

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

FIG. 15 is an explanatory diagram of an operation of the second embodiment and a measuring method based on the operation.

FIG. 16 is an explanatory diagram of the operation of the second embodiment and a measurement method based on the operation.

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

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

FIG. 19 is an explanatory diagram of the operation of the second embodiment and a measurement method based on the operation.

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

FIG. 21 is an explanatory diagram of an operation of the second embodiment and a measuring method based on the operation.

FIG. 22 is an explanatory diagram of an operation of the second embodiment and a measuring method based on the operation.

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

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

FIG. 25 is an explanatory diagram of the operation of the second embodiment and a measuring method based on the operation.

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

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

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

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

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

FIG. 31 is a flowchart showing a measuring method according to a 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 median sectional view of FIG. 32;

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

FIG. 35 is a flowchart for explaining the operation and measurement method of the fifth embodiment.

[Explanation of symbols]

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

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yukio Ikezawa 75-1, Hasunuma-cho, Itabashi-ku, Tokyo Inside Topcon Corporation (56) References JP-A-52-148142 (JP, A) (JP, U) Japanese Utility Model Showa 60-68452 (JP, U)

Claims (1)

(57) [Claims] 1. A lens measuring means for measuring a refraction characteristic of a test lens placed in a spectacle frame , a single spectacle frame restricting member for restricting a left-right direction at a central portion of the spectacle frame, and the spectacles A lens meter comprising eyeglass frame position detecting means for detecting the position of a frame regulating member.