JPS62215814A - Apparatus for measuring shape of lens fixing mold of frame of spectacles - Google Patents

Abstract

PURPOSE:To simply obtain data determining the shape of a lens fixing mold, by measuring the three-dimensional coordinate data of the lens fixing groove shape of the frame of spectacles and further operating the geometrical center data of the frame and curve value data. CONSTITUTION:The three-dimensional coordinate data of a lens fixing groove shape is measured by a groove shape measuring apparatus through a probe matched with the groove of the frame of spectacles and moving therealong and supplied to the operational processor 400 of a measured data processing unit 200. The processor 400 calculates the curve value of the frame of spectacles from the three-dimensional coordinate values of the fixing groove at three points thereof and, further, the geometrical center of the frame of spectacles is determined by the operation corresponding to the calculation method from a data input device 300. Similarly, operation is performed corresponding to the set quantities such as eccentric quantity and a pupil distance from the device 300 to simply obtain data determining the shape of a lens fixing mold and these data are outputted to a lens polishing device 800 and a display device 700.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to an apparatus for measuring lens shape from the shape of a lens fixing groove of an eyeglass frame.

(Background of the Invention) This type of device has conventionally been a mechanical copying device, which produces a template for a lens peripheral processing machine while copying a lens fixing groove of an eyeglass frame. In addition, the eyeglass frame is fixed to a rotating member and rotated, and the distance from the temporary center (uniquely set with respect to the center of rotation) within the lens rim of the eyeglass frame to the lens fixing groove is measured electrically. A device has also been proposed that captures the data as numerical data. The results obtained with either device vary depending on the mounting position of the eyeglass frame on the device, and if the mounting position is inappropriate, accurate measurements cannot be performed. In addition, since the curve value of the groove shape of the frame is not measured, when forming a bevel on the periphery of the eyeglass lens to fix the eyeglass lens to the frame, it is difficult to match the bevel curve with the groove curve of the frame. Another disadvantage was that the frame itself had to be modified to match the Jagenkarp.

(Objective of the Invention) An object of the present invention is to solve these drawbacks and provide a shape measuring device that can easily obtain data for determining the lens shape of an eyeglass frame.

(Summary of the Invention) A shape measuring device (100) that three-dimensionally determines the shape of a lens fixing groove of an eyeglass frame and outputs three-dimensional coordinate data; an arithmetic device (400) that calculates geometric center data and curve value data; and an output device (500, 700) that outputs the three-dimensional coordinate data, the geometric center data, and the curve value data as shape data of the frame. An eyeglass frame lens shape measuring device characterized by having the following.

(Embodiment) FIG. 1 is a block diagram of an embodiment of the present invention, in which an eyeglass frame lens shape measuring device includes a lens fixing groove shape measuring device 100 and a measurement data processing device 2.
00.

The lens fixing groove shape measurement device 100 three-dimensionally determines the lens fixing groove shape of an eyeglass frame and outputs three-dimensional coordinate data, the details of which will be described later.

The measurement data processing device 200 includes a data human power device 300,
It has an arithmetic processing device 400, an interface device 500, a storage device 600, and a display device 700.

The data input device 300 is composed of a numeric keypad and the like so that the amount of eccentricity, manual measurement method, size and diameter, and pupil distance can be input. Eccentricity is the amount that determines how much the pupil position is shifted from the geometric center of the eyeglass frame, and it is a value that changes depending on the eyeglass wearer, and ultimately determines whether or not the unprocessed lens can be processed. Input for judgment. The measurement method is displayed differently depending on various standards, so input is required to instruct the standard to be used for conversion, and examples include the boxing system, data line system, and Commerce and Industry Federation system. The size diameter is input to convert the three-dimensional coordinate data of the measured eyeglass frame into data of a similar frame. The pupil distance is input to calculate the amount of eccentricity.

The three-dimensional coordinate data output from the lens fixing groove shape measurement bag M100 and various data output from the data input device 300 are input to the arithmetic processing device 400. The arithmetic processing device 400 performs arithmetic operations using data input to the data input device 300. Specifically, according to the flowchart in FIG. 2, first, the frame curve is calculated (step 401), then it is determined which measurement method is input (step 402), the boxing system (step 403), and the data line system (step 402). In step 404), the geometric center corresponding to the size measurement method of each frame is calculated by the Federation of Commerce and Industry system (step 405), and then it is determined whether or not the size diameter has been input.In step 406), if it has been input, Perform size/diameter conversion processing (step 407) to determine if the size/diameter has not been input or if step 407 has been completed, determine whether or not the amount of eccentricity has been input (step 408); if the amount of eccentricity has been input, processing is possible. The size of the lens is calculated (step 409), and when step 409 is completed, it is determined whether the pupil distance PD has been input (step 410), and if the pupil distance PD has been input. If so, calculate the amount of eccentricity (step 4
11).

Next, a flowchart for calculating the frame curve shown in FIG. 3 will be described (corresponding to step 401 in FIG. 2). First, coordinate data of three different points P, , P, , P3 are selected from among the three-dimensional coordinate data of the frame (step 412).

Next, the equation of the sphere is calculated from the coordinate data of P+, Pz, and P3 (step 413). This ball is the ball on which the lens fixing groove of the eyeglass frame rests.

When the equation of the sphere is found in step 413, step 41
In step 4, the radius of the sphere is calculated (step 414), and the curve value is calculated (step 415). Further, at this time, by comparing the center coordinate data of this sphere with the geometric center coordinate data of the three-dimensional coordinate data of the frame, the inclination of the frame at the time of measurement can also be calculated.

Further, a flowchart corresponding to step 403 in FIG. 2 will be explained with reference to FIG. 4. That is, among the three-dimensional coordinate data, two-dimensional coordinate data (X coordinate, Y coordinate) that determines the planar shape of the frame is input (step 416).
, find the maximum value and minimum value of the X coordinate data (step 41
7) Find the maximum and minimum values of the Y coordinate data (step
knob 418). Thereafter, coordinates Xc and Yc of the geometric center are calculated from the maximum and minimum values obtained in steps 417 and 418 using the following formula (step 419).

The same applies to flowcharts 404 and 405, so the description thereof will be omitted.

A flowchart corresponding to step 407 in FIG. 2 will be explained with reference to FIG. In this case, input the three-dimensional coordinate data and size diameter (step 420), convert the three-dimensional coordinate data into data whose measurement center is the geometric center (step 42), and calculate the size diameter using the following formula. Calculate (step 422) Y'n = Yn±□ fη "〒Yn" However, X'n, Y'n are coordinate values after conversion, Xn, Yn
is the coordinate value before conversion, M is the size diameter, and subscript n is the n-th coordinate value.

A flowchart corresponding to step 409 in FIG. 2 will be explained with reference to FIG. In this case, the three-dimensional coordinate data and the amount of eccentricity are manually calculated (step 423), and the distance from the position shifted by the amount of eccentricity from the geometric center of the frame to the lens fixing groove is calculated over the entire circumference (step 42).
4). Thereafter, the maximum value of the distance obtained in step 424 is calculated (step 425), and the size of the raw lens that fits into the frame is calculated (step 426).

Furthermore, a flowchart corresponding to step 411 in FIG. 2 will be explained with reference to FIG. In this case, first input the three-dimensional coordinate data and pupil distance PD of the left and right lens shapes (Step 427), calculate the geometric center of the left and right lens shapes of the frame (Step 428), and then calculate the distance between the frame centers of the frame. Calculate FPD (Step 429), and calculate eccentricity IL using the following formula (Step 430).

The arithmetic processing unit 400 sends the data converted and calculated in this way to the interface device 500 and the storage device 600.
, and sent to the display device 700. The display device 700 displays the curve value of the lens shape of the frame, the processable lens size, and the PD.
A display unit 4a using a CRT, LCD, etc. is provided so that the lens lens shape and position are displayed together with a display representing the geometric center.

The storage device 600 also includes a storage unit 600a using a hard disk, a C memory, etc., and a search unit 600 for assigning numbers to and searching for stored eyeglass frame data.
It is composed of b.

The interface device 500 is an R3232C device for the purpose of transmitting data with other machines, such as the beading machine 80Q.
It is made up of etc.

Next, the lens fixing groove shape measuring device 100 will be described in detail.

FIG. 8 is a perspective view showing the mechanical part of the measuring device 100;
The figure shows only the measuring portion of the lens fixing groove shape in FIG. 8. The measuring arm 1 has a stylus 2 at its tip, and the other end is supported so as to be freely rotatable around a shaft 3. On the axis 3 there is an arrow 2. of the measuring arm l. A rotary encoder 4 is mounted to measure the directional movement.

This encoder 4 is an absolute encoder for measuring absolute position or an incremental encoder with an origin signal. Measuring arm 1, stylus 2, shaft 3,
The encoder 4 as a whole is supported by a support member 7 so as to be freely rotatable in the direction of an arrow 12 about an axis 5, and the amount of rotation is measured by a rotary encoder 6. This encoder 6 is also an absolute encoder or an incremental encoder that can measure absolute position.

The stylus 2 moves along the groove of the rim of the eyeglass frame 8 under the weight of the measuring arm 1. The eyeglass frame 8 is attached to a slide table 10 by frame fixing members 9a, 9b, and 9c.
Fixed. The slide table 10 is slidably attached to a guide 11 by a dovetail groove, and the guide 11 is fixed to a frame rotary plate 12 having gears cut on the side surface. A rack 17 is fixed to the slide table 10 in the direction of an arrow 13, and a gear 18 rotated by a motor 19 fixed to a holding plate 12° integral with the rotary plate 12 is meshed with the rack 17. The amount of movement of the slide table IO in the direction of the arrow 13 is measured by the linear encoder 13. The linear encoder 13 includes, for example, an optical grating provided on the guide 11 and an optical grating reading device provided on the slide table IO. Since a small gear driven by a pulse motor 14 meshes with the gear of the frame rotary plate 12, the rotary plate 12 is rotated by the pulse motor 14. Further, a light shielding vi 16 for the initial position detection photosensor 15 is attached to the frame rotating plate 12 .

When measuring eyeglass frames, first the stylus 2 is aligned with the groove of the frame, and then it moves by its own weight following the groove of the frame. Therefore, when the eyeglass frame 8 is rotated around the Z-axis, the measuring arm 1 moves in the direction indicated by the arrow 1. in accordance with the groove shape of the frame. ,/
, and the amount of rotation can be read by the encoder 4.6.

That is, the three-dimensional measurement value that determines the amount of balls in the eyeglass frame 8 is determined by the rotation angle θ around the Z-axis based on the number of pulses given to the pulse motor 14, and the position r in the direction perpendicular to the Z-axis determined by the encoder 4. , the position in the Z-axis direction is obtained by the encoder 6. Here, the rotation angle θ and the position r are data that define the planar shape of the eyeglass frame 8. When the measurement of the amount of balls on one side is completed (that is, after the initial position detection photosensor 15 is shielded from light by the light-shielding plate 16 and the initial position signal is obtained, the stylus 2 is again obtained). By driving the motor 19, the slide table 10 is slid in the direction of the arrow 1 through the gear 18 and the rack 17, and the stylus 2 is set inside the other rim. The amount of slide of the slide table 10 at this time is measured by the encoder 13. Thereafter, the shape of the other lens groove is measured in the same manner. Note that since it is sufficient to know the relative position in the direction of the arrow 12, the encoder 6 may be an incremental encoder that can only know the relative position.

As described above, it is possible to measure each groove shape and the relative positional relationship of each groove shape for the artist type of the eyeglass frame.

FIG. 10 is a block diagram of an electric circuit used in conjunction with FIG. 8, and after turning on a measurement start switch (not shown),
The pulse generator 31 generates clock pulses in response to a command signal from the microcomputer 3o. This clock pulse drives the pulse motor 14 and is counted by the counter 32. An initial position signal obtained by shielding the photosensor 15 from light by the light shielding plate 16 resets the counter 32 and is input to the microcomputer 30.

The micro combinator 30 operates according to a flowchart as shown in FIG. That is, as described above, when the measurement start switch (not shown) is turned on, the microcomputer 30 drives the pulse generator 31 in step 40.
), when the initial position signal output from the photosensor 15 is input (step 41), the counted value of the encoder 4.6 is stored in correspondence with the counted value of the counter 32 (
Step 42). Then, when the initial position signal is manually inputted again (step 43), the eyeglass frame has been rotated once, so the generation of pulses from the pulse generator 31 is stopped (step 44).

Then, when a command to drive the slide table 10 is issued from a switch (not shown) (step 45), the microcomputer 30 operates the motor 19 (step 45).
). When the stop switch of the motor 19 (not shown) is turned on and the measurement start switch is turned on again (step 47.4)
8), the microcomputer 30 drives the pulse generator 31 (step 49), the microcomputer 30
Similarly to step 42, the count value of the encoder 4.6 is stored in correspondence with the count value of the counter 32 (step 50), and when the initial position signal is input again (step 51), the count value from the pulse generator 31 is stored. Generation of pulses is stopped (step 52).

With such a structure, after fixing the eyeglass frame 8 to the slide table 10 using the frame frame fixing members 9a, 9b, and 9c and dropping the stylus 2 into the lens fixing groove, press the measurement start switch (not shown). By simply turning on the data that determines the true type of one is automatically obtained. And stylus 2
is removed from one rim, and by turning on a drive command switch (not shown), the slide table 10 is moved to a position where the stylus 2 can be comfortably inserted into the other rim (with the measuring arm 1 horizontal). Turn off the drive switch at a position where the stylus 2 falls into the lens fixing groove on the other rim, drop the stylus 2 into the lens fixing groove on the other rim, and turn on the measurement start switch. The data that determines the true form of is automatically obtained.

The three-dimensional coordinate data thus measured by the lens fixing groove shape measuring device 100 is processed by the arithmetic processing device 40.
0, the arithmetic processing unit 400 performs arithmetic processing according to the flowcharts in FIGS. to be displayed. And if necessary, the interface device 50
0 to an external device such as the ball slider 800.

According to the above embodiment, when measuring the groove shape of the frame,
It is no longer necessary to fix the frame so that it does not tilt or to fix the frame while centering the geometric center of the regular frame, making measurement easier. Calculation and correction based on measurement data has the advantage of making measurements more accurate. In addition, since the groove curve of the frame is calculated, when fixing the eyeglass lens to the frame, it is possible to match the groove curve of the frame and the bevel curve of the peripheral edge of the eyeglass lens, making it easier and more accurate to fix the eyeglass lens. There are advantages. Next, the distance between the frame centers of the frames (F P D) is calculated by applying the calculated geometric center of the normal form to the normal forms of the left and right frames, and the input pupillary distance (PD) is used. In order to align the optical center of the lens with the center of the pupil,
It is also possible to calculate the amount of eccentricity, which is how much the optical center of the lens should be shifted in the horizontal direction from the regular geometric center of the frame. At that time, if a prism is used or if the lens is used for near vision glasses, the optical center of the lens can be set at an arbitrary position by inputting the amount of eccentricity according to the width comparison. Therefore, in consideration of the amount of eccentricity, the interface 500 provides data that allows the creation of a template that is eccentric from the geometrical center of the regular mold by the amount of eccentricity. There is an advantage that a template eccentric by a necessary amount can be produced by outputting it to the production device 800. Also, even if the lens shape of the frame is the same, there are frames with different sizes, and in that case, the groove shape data of the regular mold is converted based on the input size diameter data, and the same goes for templates of different sizes. It can be made to Furthermore, the storage unit 60
By storing the groove shape data for each regular frame in 0a, there is no longer a need to keep a large stock of templates that match the regular frame shape, and the stored data can also be displayed on the display. It is also possible to search using a CRT display or the like. The embodiments of the present invention have many advantages as described above, and are of great utility in the process of fixing spectacle lenses to the regular shape of the frame.

In addition, in the above example, when determining the shape of the lens fixing groove three-dimensionally, fine-grained data is obtained from the encoder in each dimension, but the fine-grained data for determining the correct shape is obtained by specifying the planar shape of the frame. rotation angle θ and position r
Since the position in the Z-axis direction obtained by the encoder 6 is needed only when determining the groove curve, data from only three locations is sufficient to determine the ball.

(Effects of the Invention) As described above, according to the present invention, it is possible to easily obtain data for determining the shape of the amount of beads in the frame, so that it is possible to obtain the effect that the machining and framing work of eyeglass lenses is facilitated.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIGS. 2 to 7 are flowcharts for explaining the operation of the arithmetic processing unit 400 shown in FIG. 1, and FIG. 8 is a measurement of the shape of the lens fixing groove. FIG. 9 is a perspective view showing only the measuring section in the shape of a lens fixing groove in FIG. 8; FIG. 10 is a block diagram of an electric circuit used in conjunction with FIG. 8; FIG. FIG. 11 is a flowchart of the microcomputer 30 used in FIG. 1O. (Explanation of symbols of main parts) 100--Measuring device for the shape of a lens fixing groove of an eyeglass frame 400-1 Arithmetic processing device 500--Interface device 70 (L--1 Display device.

Claims (1)

[Scope of Claims] A shape measuring device that three-dimensionally determines the shape of a lens fixing groove of an eyeglass frame and outputs three-dimensional coordinate data; Eyeglasses characterized by comprising: an arithmetic device that calculates data and curve value data; and an output device that outputs the three-dimensional coordinate data, the geometric center data, and the curve value data as shape data of the frame. Frame lens shape measuring device.