JPH06230324A - Lens type shape measuring instrument - Google Patents

Abstract

PURPOSE:To omit measuring operation for a deviation quantity and to improve its measurement precision. CONSTITUTION:The lens type shape measuring instrument 300 which has a lens type shape measurement part 110 and a control arithmetic unit equipped with an arithmetic function for controlling the measurement part is equipped with a means 210 for inputting prescription and measurement data required for the start of measurement and the measurement, a means which finds the geometrical center of a lens type and calculate radius data on the entire periphery of the lens type based upon the center as its origin, and a means which calculates the quantity of deviation between the geometrical center of the lens type and the measurement center of the shape measurement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens shape measuring device for frame processing of spectacle lenses, particularly for patternless processing.

[0002]

2. Description of the Related Art As is generally practiced in the past, when a spectacle wearer brings in broken spectacles for repair, he / she often does not have a prescription for the spectacles.
I had to measure what the prescription of my glasses was from the actual thing. When the spectacle lens framing process breaks one piece of the framed spectacle lens (one of the pair of spectacle lenses), it becomes necessary to replace only the one piece of the spectacle lens. It was necessary to measure where the optical center of the ball was on the lens.

Because, except for the special prism prescription,
This is because a measurement is required to accurately align the vertical position of the optical center of the newly inserted lens with the vertical position of the optical center of the remaining lens. Further, in most cases, the interpupillary distance PD is not the one eye PD measured separately from the center of the nose, but the binocular PD of the sum thereof, so that the optical center position of the remaining lens is horizontal to the geometric center position. If you measure the amount of shift in the direction, as the horizontal shift of the lens to be processed,
Alternatively, it can be used as a reference value.

In this conventional measurement, the optical center is measured by using a measuring device such as a lens meter, and the geometric center (so-called boxing center) is measured by using an instrument such as an axis aligner or a ruler. It was

[0005]

In the prior art as described above, since the measuring portion of the spectacle lens is a three-dimensional one having a thickness, it is difficult to accurately obtain it, and moreover, it is troublesome. It was work. The present invention has been made in view of such conventional problems, the object is to measure the lens shape of the remaining lens, lens processing (especially became popular in recent years, The radius of the entire circumference with the optical center as the origin (rK-θ), which is necessary for so-called patternless processing, in which lens data is measured, stored once as digital data, and the data is processed to process the lens. ) By automatically measuring the data and the deviation (deviation amount) between the geometric center and the optical center at the same time, it is possible to omit the work of measuring the deviation amount and improve the measurement accuracy. It is to provide a target lens shape measuring device.

[0006]

In order to achieve the above object, the present invention provides a target lens shape measuring unit and a target lens shape controlling unit for controlling the target lens shape measuring unit, and a control calculation device for calculating the measurement data. In the shape measuring device, the radius of the entire circumference of the lens shape whose origin is the geometric center of the lens shape and the input means for inputting the measurement start instruction and the measurement data required for the measurement to the control arithmetic device The first means for solving the problem is to have a means for calculating data (rk-θ) and a means for calculating the amount of deviation between the geometric center of the target lens shape and the measurement center position for shape measurement. Yes, while controlling the target lens shape measuring unit and the target lens shape measuring unit, in the target lens shape measuring apparatus having a control calculation device for calculating the measurement data,
Input means for inputting the measurement start instruction and the measurement data to the control arithmetic unit, the measurement data, and the optical center of the framed lens as the measurement center, and the optical center position of the lens and the geometric center position Means for calculating the deviation amount of
A means for calculating a vertical shift amount and a horizontal shift amount with respect to the geometric center of the optical center from the shift amount.
It is a means for solving the above problem.

Further, by inputting the FPD value from the input means, the control arithmetic unit calculates the PD value.

[0008]

In the present invention, since the amount of deviation is automatically input as the prescription value only by measuring the target lens shape required for patternless processing, it is possible to perform lens replacement processing without measurement errors. I can. In addition, since the lens lens for measurement (lens having a processed shape) is attached to the lens shape measuring device with the lens holding adsorption rubber attached to its optical center, even with a thick lens such as a plus lens, Since the optical axis of the lens and the center of rotation of the lens shape are completely aligned in the mounted state and the lens shape (lens shape) is not tilted, highly accurate misalignment measurement can be performed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram for explaining a patternless ball-sliding machine having a lens shape measuring function of the present invention. Each device has the following roles in the overall configuration of the patternless ball mill.

The frame shape measuring apparatus 100 is an apparatus for measuring frame shape data. This device obtains a plurality of radius data of the left and right lens shapes with the geometric center (boxing) as the origin at all angles (r-θ data).
Further, the frame shape measuring device automatically measures the distance (frame PD) between the geometric centers of the left and right balls.

The lens processing device 130, similar to a normal patternless ball-sliding machine, performs a rough-polishing process on a lens with a rotating grindstone on the basis of the processing data calculated by the control arithmetic device 300, and a finishing process including a beveling process. It is a device. The automatic chamfering device 140 is the control arithmetic device 300.
This is a device for chamfering the lens based on the chamfering processing data calculated by.

Immediately after the lens processing is started, the lens shape measuring device 120 follows the R1 of the lens according to the frame shape data whose origin is the chucking center, that is, the optical center.
Data of the surface R and the surface R2 in the lens rotation axis direction is measured. Determine the lens edge thickness of the lens radius to be processed and use it for the calculation of bevel position data. The display device 200 is a data output device that displays the measured frame shape, the input prescription data, and the processing data.

The keyboard 210 is a data input device for inputting PD, prescription data such as vertical alignment, and processing data for setting conditions for lens processing. The control arithmetic unit 300 is
It is composed of a CPU 301, a program memory 302, a data memory 303, and input / output circuits 304 and 305. Here, the hardware configuration of the lens shape measuring apparatus will be described in detail.

The lens shape measuring device is for detecting the outer diameter of the lens, the edge thickness, the bevel position, etc., and will be described below with reference to FIGS. 6 and 7. FIG. 6 is a perspective view showing the outer appearance of the lens shape measuring device, and FIG. 7 is an AA ′ of FIG.
FIG. Two guide rails 802a and 802b are provided in parallel on the base frame 801, and both ends thereof are fixed to the frame on the base. A Y-direction moving table 803 is slidably arranged on the guide rails 802a and 802b. Two support members 810 and 811 are fixedly mounted on the moving table 803,
Between the support members 810 and 811, both ends of the parallel rails 813a and 813 fixed to the support members 810 and 811 are fixed.
13b has been handed over. An X-direction moving table 812 is slidably arranged on the parallel rails. The measuring shaft 821 is rotatably fitted on the moving table 812, and the movement in the axial direction is a ring 823 attached to the measuring shaft 821.
And 827. A wave washer 828 is sandwiched between the ring 827 and the moving table 811, and a switch 8 is provided below the moving table 812.
29 is attached. When the measuring shaft 821 moves in the Y direction, the ring 827 comes into contact with the switch 829 and turns on. However, usually the wave washer 828
The switch 829 is OFF because it receives the force of.

A probe 820 is fixed to the tip of the measuring shaft 821. The tracing stylus 820 includes a lens outer diameter or template measuring unit 820a, an edge thickness measuring unit 820b, and a bevel measuring unit 8.
It is made of 20c. A tension spring 804 is stretched between the moving table 803 and the base frame 801. On the other hand, a rack 807 is formed at one end of the moving table 803, and is connected to the Y-direction moving motor 805 which is a pulse motor via the clutch 106. The gear 806a is fitted to one rotation shaft of the clutch 806,
The pinion 80 meshed with the pinion 805a fitted to the rotary shaft of the motor 805 and fitted to the other rotary shaft.
6b meshes with the rack 807. With this configuration, the moving table 803 is pulled to the left with respect to the drawing by the force of the tension spring 804 when the clutch 806 is OFF. When the clutch 806 is ON, the motor 805
When rotates, it moves in the Y direction. A rack 807 is formed at the other end of the moving table 803, and an encoder 80
It is meshed with a pinion 808a fitted on the rotating shaft of the shaft 9. With this configuration, the moving amount of the moving table 803 is detected by the encoder 809. Four compression springs 814a, 814b, 814c, 814d are passed between the X-direction moving table 812 and the supporting members 810, 811, and the moving table 812 is always attached by a force so as to come to the neutral position in the X-direction. It is energized. On the other hand, the support member 810,
A rack 815 having both ends fixed to the support members 810 and 811 is disposed between the 811 and meshes with a pinion 816a fitted to a rotary shaft of an encoder 816 attached to the moving table 812. ing. With this configuration, the moving amount of the moving table 812 can be detected by the encoder 816.

A gear 826 is fitted to the end of the measuring shaft 821, and the measuring shaft rotating motor 82, which is a pulse motor.
5 meshes with a gear 825a fitted to the rotary shaft.
With this configuration, the measurement shaft 82 is rotated by the rotation of the motor 825.
1 can be rotated. Further, the solenoid 824 is fixed to the Y-direction moving table so as to face the end of the measuring shaft 821, and when the solenoid 824 is turned on, the solenoid 824 is attached to the end of the measuring shaft 821. That is, the solenoid 824
The measurement shaft 821 can be fixed by turning on.

Although the hardware configuration has been described above, in combination with the software configuration, in this apparatus, the measuring shaft having the contact point fixed to the tip thereof is not movable in the axial direction, and the center of the axis is movable. Since it is configured to be inverted by 180 °, it is possible to sequentially measure the front refracting surface and the rear refracting surface of the lens to be processed by the edge thickness measuring portion of one probe. Further, by providing the measuring element with the bevel measuring portion, it is possible to measure the bevel position of the lens to be processed, which is already processed. (Details of software and other configurations are disclosed in JP-A-3-261814) In the present invention, the lens shape measuring unit 110, which is a part of the lens shape measuring device, is separated from the lens shape measuring device to form a lens shaving machine. However, it may be included as a function of the lens shape measuring apparatus, or may be included in the frame shape measuring apparatus if it has the function.

In patternless processing, the frame shape measuring apparatus 100 is used to input the target lens shape data for processing.
And the lens shape measuring unit 110 is used. In this embodiment, a control arithmetic circuit 300 using a so-called microcomputer is used, but the circuits are a CPU 301, a program memory 302, a data memory 303, an input / output circuit 30.
Includes 4,305.

FIG. 2 shows a flow chart for measuring the target lens shape of the control arithmetic circuit 300 of the present invention. A template 151 or the like to be measured prior to the measurement is attached to the target lens shape measuring unit 110. The mounting method is shown in FIG. Conventionally,
That is, when measuring only the shape of the target lens shape, the adapter 1 for holding and fixing the template 151 following the shape measuring frame is used.
50 is set on the target lens shape measuring unit via the holding units 30a and 30b. Alternatively, it is set in the target lens shape measuring section by using the suction rubber 152 or the like at substantially the center of the dummy lens 153 put in the frame from the beginning.

In the case of the present invention, that is, in the case of measurement of lens exchange processing, the radius of the entire circumference (rK
-[Theta]) data and the deviation between the geometric center and the optical center (deviation amounts Lh, Lv) are automatically measured, the adapter for holding and fixing (adsorption rubber 15
2 etc.) and set in the lens shape measuring part. At this time, a lens meter is used to detect the optical center, and a general axis aligner is used to attach the suction rubber.

The lens shape measurement will be described below with reference to FIGS. 2, 3, and 4. FIG. 2 is a flow chart showing the measurement operation in the present invention, FIG. 2 is a view for explaining boxing center and shift amount measurement, and FIG. 4 is a view for explaining the keyboard and display in the present invention. When the trace start key 218 of the keyboard 210 is pressed, the control arithmetic circuit 300 carries out the measurement of the pattern, the calculation, the display of the result, etc. according to the following steps 1 to 6.

Step 1: The control arithmetic circuit 300 sends a measurement start command to the target lens shape measuring unit 110, and the target lens shape measurement is performed by a template following a frame, a dummy lens included in the frame, or a frame Radius data (r-θ) from the lens of a single lens with the measurement center of the lens as the origin
Is measured over the entire circumference. (FIG. 3a) However, in the case of the measurement of the single-ball replacement processing of the present invention, the radius (rK-θ) data of the entire circumference with the optical center as the origin is measured.

Step 2: The control arithmetic circuit 300 causes the measured radius data of the entire circumference (r-θ) or (rK-θ).
Use to find the boxing center position (XB, YB).
(Fig. 3b) The boxing center position (XB, YB) is calculated as follows. The coordinate (XP, YP) of the measurement point P is defined as the measurement center coordinate (0, 0): XP = r · COS θ YP = r · SIN θ Among the plurality of measurement points P, the point P1 having the largest X coordinate , And set its X coordinate to XP1
And

A point P3 having the smallest X coordinate is searched for, and its X coordinate is XP3.
And Find the point P2 with the largest Y coordinate and set its Y coordinate to YP2.
And Find the point P4 with the smallest Y coordinate and set its Y coordinate to YP4.
And The boxing center coordinates (XB, YB) are obtained by XB = (XP1 + XP3) / 2 YB = (YP2 + YP3) / 2.

If the setting is the lens exchange type ball measurement mode, the operation proceeds to step 3. If the setting is the conventional template measuring mode, the process proceeds to step A. Step 3: The control arithmetic circuit 300 is boxing center-
The distance between the optical centers (measurement centers) is determined by the XY coordinates. (Fig. 3c) Horizontal distance LH = 0-XB Vertical distance LV = 0-YB → Vertical shift amount Step 4: The control arithmetic circuit 300 causes the display unit 200 to display
The shape 241, the optical center position 243, and the boxing center position 242 of the mold ball are graphically displayed, and the obtained vertical shift amount LV 231 is displayed as a numerical value.

Step 5: FP from the keyboard 210
When the D value 240 is input, it is displayed on the display, and the PD value 230 is calculated by the following formula and displayed. PD = FPD + 2 · LH Step 6: In the lens interchangeable lens measurement mode, the measurement data is set to the optical center from the beginning, so the measurement is completed as it is without calculation as the lens radius data (rK −θ). .

Step A to Step F: In these steps, after performing the usual template measurement, FPD, P
D, Vertical alignment is read from the keyboard, and the values are used to calculate the target lens radius data with the optical center as the origin (rK −
θ) is calculated. As is clear from the explanation of the above steps, in the lens interchangeable lens measurement mode, attach the adsorption rubber to the optical center of the lens lens to be measured, attach it to the lens shape measurement section, and press the trace start key. Then, the value LV of the one-sided vertical displacement required for lens replacement is measured and displayed.

Further, the PD value is displayed only by measuring the frame next time or using the one written in the frame and inputting the FPD value from the keyboard. To correct the displayed PD value 230, use the cursor movement key 21
Move the cursor 251 to the PD value with 5, and press the [+] key 21
6, can be changed with the [-] key 217. According to the invention,
Although these input prescription values are indispensable for processing the patternless ball-sliding machine, they can be input easily and without error.

In the present embodiment, the lens shape measuring device and the lens shape measuring portion are separated, but the lens shape measuring device in which they are integrated can perform the same operation as this embodiment. Needless to say. Further, it goes without saying that this may be used as long as it is a frame shape measuring device having the function of the target lens shape measuring unit.

[0030]

As described above, according to the present invention, by measuring the lens shape of the target lens in the lens exchange mode, it is possible to obtain the amount of deviation of the optical center at the same time as measuring the target lens shape, and automatically adjust the vertical position. Since it is displayed and output as the misaligned value, there is an effect that it is possible to perform lens replacement processing with high accuracy and without measurement error. In addition, since a lens holding adsorption rubber is attached to the optical center and attached to the lens shape measurement unit, even with a thick lens such as a plus lens, the optical axis of the lens and the lens center of rotation of the lens are completely aligned when attached. Since the mold does not tilt, highly accurate target lens shape measurement and shift measurement are possible. 1

[Brief description of drawings]

FIG. 1 is a block diagram illustrating a patternless ball slicing machine having a target lens shape measuring function of the present invention.

FIG. 2 is a flowchart showing a measurement operation according to the present invention.

FIG. 3 is an explanatory diagram of a boxing center of the present invention and measurement of a shift amount. FIG. 3a is an explanatory diagram for measuring radius data (r-.theta.) With the measurement center of the target lens as the origin over the entire circumference, and FIG. 3b is a diagram for explaining the contents for obtaining the boxing center position (XB, YB). FIG. 4 is a diagram for explaining the content of the distance between the boxing center and the optical center (measurement center), which is obtained by XY coordinates.

FIG. 4 is an explanatory diagram of an embodiment of a keyboard and a display device of the present invention.

FIG. 5 is a diagram illustrating a method of attaching a template 151 or the like to be measured to the target lens shape measuring unit 110.

FIG. 6 is a perspective view showing an appearance of a lens shape measuring device.

FIG. 7 is a sectional view taken along the line A-A ′ in FIG.

[Explanation of symbols]

 110 Target shape measurement unit 200 Display 210 Keyboard 218 Trace start key 250 Measurement mode display 230 PD value display 231 Vertical alignment display 241 Target shape display 242 Boxing center display 243 Optical center display 300 Control arithmetic unit

Claims (3)

[Claims] 1. A target lens shape measuring device having a target lens shape measuring part and a control calculation device for controlling the target lens shape measuring part and calculating the measurement data thereof, wherein a measurement start instruction and measurement are given to the control calculation device. Input means for inputting the prescription and measurement data required for, the means for calculating the geometrical center of the target lens shape and calculating the radius data (rk-θ) of the entire target lens shape with the center as the origin, And a means for calculating a deviation amount between a geometric center and a measurement center position for shape measurement. 2. A lens shape measuring apparatus having a lens shape measuring unit and a control calculation unit for controlling the lens shape measuring unit and calculating the measurement data thereof, wherein a measurement start instruction and measurement are given to the control calculation unit. Prescription necessary for, input means for inputting measurement data, means for calculating the deviation amount between the optical center position of the lens and the geometric center position, with the optical center of the framed lens as the measurement center, and A target lens shape measuring device comprising: means for calculating a vertical shift amount and a horizontal shift amount with respect to a geometric center of an optical center from a shift amount. 3. The target lens shape measuring device according to claim 1, wherein the control calculation device calculates the PD value by inputting the FPD value from the input means.