JP3242957B2 - Bevel position display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bevel position display device, and more particularly to a display for displaying a bevel position of an eyeglass frame on a screen and performing a beveling process on a lens to be processed before being beveled and framed in the eyeglass frame. The present invention relates to a bevel position display device.

[0002]

2. Description of the Related Art Conventionally, when a lens is beveled by a spectacle lens processing machine that automatically grinds the peripheral edge of the lens into a shape that can be fitted to the inner peripheral surface of the lens frame of the spectacle frame, The expected shape of the lens after beveling is displayed as an image. As an example, the developed image of the lens periphery (edge) including the bevel apex position of the lens is synthesized over the entire 360 ° of the lens-shaped image viewed from the front surface of the lens (front in the optical axis direction). There is a method of displaying the bevel position. This is described in, for example,
This is a display method which is already disclosed in, for example, Japanese Patent Application Laid-Open No. 135135/1995, and further determines a bevel apex position by a beveling process on a rough-ground processed lens having a lens peripheral portion having a different thickness according to the shape of an eyeglass frame. Useful for. By displaying the bevel apex position, the operator predicts, in advance, at which radial position the lens will protrude from the lens frame before and after the frame when the beveled lens is framed in the lens frame. This is because it is possible to determine the lens bevel position and perform appropriate beveling.

[0003]

However, the display method described above combines the bevel position with the developed image of the lens periphery, and the lens shape displayed on the screen is different from the actual lens shape to be beveled. For this reason, if the bevel position is determined only by looking at the image display during the working operation, the three-dimensional shape of the actually beveled lens may be different from the one intended by the working operator.

[0004] For this purpose, the above-mentioned publication further displays only one image in which the rim bevel vertex position is superimposed on the lens edge side image and the rim side surface image, and displays the mutual bevel positional relationship between the lens frame rim and the lens edge. The invention that makes it possible to grasp the above is also described. However, in this conventional method, the edge and the bevel position of the lens after rough grinding are only selectively displayed as side images from any one of the up, down, left, and right directions. Is not displayed for the entire circumference of.

In particular, when the peripheral edge of the lens after the rough grinding is greatly different from the thickness of the frame, if the bevel position is not determined while changing the shape of the bevel curve itself, the bevel processing is performed on the lens edge after the beveling is performed on the lens edge. When the lens is fitted to the inner peripheral surface of the lens frame, the lens may protrude non-uniformly or may be retracted into the frame. In order to avoid such a situation and determine the three-dimensional shape of the lens that has been beveled to the shape intended by the operator, it is not sufficient to use only the side shape from any one of the up, down, left, and right directions. Therefore, there is a problem that an actual bevel shape of a lens cannot be predicted and an accurate bevel position cannot be set.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a bevel position display device capable of intuitively grasping a shape after bevel processing.

[0007]

According to the present invention, in order to solve the above-mentioned problems, prior to the beveling of a lens to be processed before beveling to be framed in an eyeglass frame, for example, the shape data measuring means is used for the processing of the lens. The three-dimensional shape of the lens to be processed before beveling is measured on the front and back surfaces of the lens with reference to the principal point of the lens. The bevel data setting means sets a bevel position of the spectacle frame and a lens bevel position necessary for framing the spectacle frame. Based on the bevel position data of the spectacle frame and the shape data of the lens to be processed, the calculating means calculates a three-dimensional expected shape of the lens to be processed after the beveling. The lens lens after beveling for the calculated expected shape
4 directions, up, down, left, and right on the side of the lens, including the gen position
From the camera, together with the front image of the lens,
It is characterized in that a screen is displayed on the indicating means.

Further, the present invention is characterized in that the display means simultaneously displays, on the screen, a plurality of images from the four directions of up, down, left, and right on the side surface of the lens including the lens bevel position, together with the front image of the lens.

[0009]

When the roughing of the peripheral portion of the lens is completed, the bevel position and the bevel shape can be adjusted on the basis of images from four directions of the lens side surface including the lens bevel position after the beveling. In addition to the front image of the lens, the four sides of the lens side including the lens bevel position
Images from different directions can be presented to the operator of the lens grinding device in a lump. The bevel shape and the bevel position of the lens are intuitively grasped based on the predicted shape displayed on the screen.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of a lens grinding device provided with the bevel position display device of the present invention.

The lens grinding device includes a shape data measuring means 1
00, a lens grinding means 200, an arithmetic control circuit 300, a data input means 400, and a display means 500 as main elements.

The shape data measuring means 100 includes a frame shape measuring section 110 for measuring the shape of the lens frame of the frame.
And the arithmetic and control circuit 30
0, a frame shape measuring circuit 120, a lens shape measuring unit 130, and a lens shape measuring circuit 140. In the shape data measuring means 100, the shape data of the lens frame of the frame in which the processed lens is to be framed is measured by the frame shape measuring unit 110, and the lens table of the lens to be processed before beveling is measured by the lens shape measuring unit 130. From the back surface, the three-dimensional shape of the lens to be processed corresponding to the inner peripheral shape of the lens frame of the spectacle frame is measured.

The lens grinding means 200 includes a lens grinding unit 2.
00a, lens grinding unit 200a, and arithmetic and control circuit 300
And a lens grinding circuit 200b having a motor drive circuit and the like. In the lens grinding means 200, a grinding process for making the pre-processed lens held on the rotating shaft coincident with the lens optical center correspond to the shape of the frame based on the grinding data, and a subsequent bevel grinding process are performed.

The arithmetic control circuit 300 has a microprocessor structure, and calculates a three-dimensional expected shape of the lens to be processed before beveling.
A calculating means 320 for inverting the shape data of one lens frame and converting it into the other shape data, calculates a pair of shape data of the frame, and forms a pair of grinding data 330 having the origin at the lens optical center based on the shift amount data. It comprises data correction means 310 for correction.

The data input means 400 includes a bevel data input key 401 for setting a bevel data for specifying a bevel position and a bevel shape of a lens to be processed, a numerical key 402 for inputting a shift amount, and a lens to be roughly ground right or left. A selection key 403 is provided for selecting one of the following. Further, although not shown in the drawing, the display screen includes a reset key for the display screen, a chucking pressure designation key, an on / off key, a key for switching between free bevel and auto bevel, and the like. In the rough grinding, there are a method of actually measuring the shape data of the frame using the frame shape measuring unit 110 and a method of using shape data of each frame which is measured in advance. In the latter case, the rim shape data is stored in an IC card, etc.
An IC card reader for reading shape data from a C card serves as a shape data reading means as a data input means 4.
00 is provided.

The display means 500 simultaneously displays a plurality of images of the lens side surface from four directions including the lens bevel position for the expected shape calculated by the calculation means 320 based on the grinding data 330. Display means 5 for this
00 is a processor that creates necessary image data (PP
U) 501.

FIG. 2 is a diagram showing an example of the screen configuration of the display means 500. The display unit 500 displays a front image 510 and four lens side images 520 including a lens bevel position together with lens simulation data with respect to the expected shape of the lens to be processed calculated by the calculation unit 320. The screen of the right eye lens (R) is shown. The display surface of the lens front image 510 displays a coordinate axis having the origin at the geometric center of the lens as a solid line and the optical center of the lens as a broken line,
It is arranged as a full-size image on the left side of the screen. In addition, the four lens side images 520 are substantially at the center of the screen.
With the display reference point 521 corresponding to the geometric center as the center,
The image is displayed as a full-size image at equal distances in the upper, lower, left, and right directions. The upper side image 522 is viewed from above the lens, and the lower side image 52 is viewed from below the lens.
3. A right side image 524 viewed from the nose side of the lens is on the right side, and a side image 525 viewed from the ear side of the lens is on the left side.

Further, lens simulation data is displayed on the right side of the screen. As the lens simulation data, the bevel position, the value of the bevel curve / bevel ratio, and messages related to the lens front image 510 and the lens side image 520 are displayed.

When the display area of the display means 500 is small, the display means 500 displays only the four lens side images 520 including the lens bevel position, or simultaneously displays the side images 522 and 523 together with the lens front image 510. Side images 524, 5 displayed and viewed from the ear and nose
25 may be configured to be switched and displayed as needed.

FIG. 3 is a detailed diagram showing the frame shape measuring unit 110 for setting the shape data of the lens frame of the frame in which the processed lens is to be framed. Glasses frame 1
Reference numeral 11 is fixedly held at a predetermined position on a frame table (not shown) by a frame holding member. At this position, the tracing stylus 112 comes into contact with the inner peripheral groove of the lens frame of the spectacle frame 111. This measuring element 112 has a rotating shaft 113
Is fixedly provided on a rotating plate 114 that rotates around the center, and can move along the inner peripheral groove of the lens frame of the spectacle frame 111 while being restrained by the sliding plate 115 that constitutes a sliding mechanism. The rotation angle when the tracing stylus 112 moves is determined by the
Is defined by the angle at which the slider 112 is rotated.
15 further converts the amount slid in the left-right direction in the drawing into a rotation angle, which is transmitted to the potentiometer 117 and can be measured. The rotary encoder 118 allows the rotating plate 11
The rotation angle from the reference position of No. 4 is measured, and the origin position of the tracing stylus motor 116 can be detected by the origin position detection circuit 119 constituted by a photo interrupter.

FIG. 4 is a block diagram showing a frame shape measuring circuit. A rotation command is given to the motor drive circuit 116a in a state where the tracing stylus 112 is in contact with the inner periphery of the lens frame of the eyeglass frame 111 to drive the tracing stylus motor 116.
The tracing stylus 112 moves together with the rotation shaft 113, the rotation plate 114, and the slide plate 115, and moves along the inner peripheral groove of the lens frame of the spectacle frame 111. Rotating plate 1 at this time
14 are output from the rotary encoder 118 and counted by the counter 118a. The displacement amount r of the tracing stylus 112 from the measurement reference position is output from the potentiometer 117 and is converted into a digital value by the A / D conversion circuit 117a. When the tracing stylus 112 makes one rotation of the inner circumferential groove of the lens frame of the spectacle frame 111, a one-turn signal is output from the counter 118a, and a stop command is given from the arithmetic control means 300 to the motor drive circuit 116a.

The eyeglass frame left / right eye determination circuit 119
a determines whether the tracing stylus 112 is in contact with the rim of the left or right eye of the spectacle frame 111, and determines the count value of the rotation angle θ and the digital value of the displacement amount r by a predetermined value of the arithmetic and control circuit 300 described later. Store in storage area.

In the frame shape measuring section 110, the tracing stylus moves along the inner peripheral groove of the lens frame while maintaining a predetermined contact pressure, and the frame shape data is read. The displacement amount r of the tracing stylus 112 corresponds to the length of the moving radius of the frame of the spectacle frame 111 (hereinafter, simply referred to as the moving radius).
The rotation angle θ of 14 corresponds to the rotation angle of the frame of the spectacle frame 111.

FIG. 5 is a detailed view showing a lens grinding section 200a constituting the lens grinding means 200 of FIG. FIG. 6 is a block diagram showing the lens grinding circuit 200b. In the lens grinding unit 200a of FIG. 5, the horizontal direction is the Z axis,
The vertical direction is represented as the Y axis. The X axis is a direction perpendicular to the paper surface and is set perpendicular to the optical axis of the lens 201 before processing.

The lens grinding unit 200a is used for the lens 20 before processing.
Storage box 2 that can move in the Z-axis direction while supporting 1
02. The storage box 202 is moved in the Z-axis direction on the base 203 of the lens grinding unit 200a,
Further, by moving the base 203 on the Y-axis, a predetermined amount of processing can be performed on the initially unprocessed lens 201. The grinding pressure adjusting mechanism 210 is provided for the lens 20 before processing.
The grinding pressure is adjusted in the Y-axis direction of the base 203 on which the carriage 202 is mounted. The Z-axis direction drive mechanism 220 positions the unprocessed lens 201 together with the storage box 202 in the left-right direction (Z-axis) in FIG. The lens rotation mechanism 230 for processing the lens 20 before processing.
And a lens axis 231 for rotating the lens axis 1.
Numeral 31 rotates the lens 201 before processing by the lens chuck mechanism 240 to be processed. The Y-axis direction drive mechanism 250 moves the lens 201 before processing by a predetermined amount while adjusting the position in the Y-axis direction by the sensor bar 251 fixed to the base 203. The diamond wheel 261 includes a grindstone 261a for roughly grinding the peripheral portion of the lens 201 before processing to a predetermined shape, and a grindstone 261b formed with a bevel for beveling.
Is rotatably provided at a predetermined speed by a diamond wheel rotating mechanism 260 in order to roughly grind or bevel processing (processing of V-groove).

The base 203 is connected by wire ropes 211a and 211b of the grinding pressure adjusting mechanism 210 and is always lifted upward so that the lens 201 before processing contacts the diamond wheel 261 with a predetermined grinding pressure. Is controlled. Therefore, the grinding pressure adjusting motor 21
2, the origin position detection sensor 213 detects the origin positions of the wire ropes 211a and 211b,
The unwinding length of the wire rope 211a by the grinding pressure adjusting motor 212 is detected by a winding amount detection sensor 214. In the middle of the wire ropes 211a and 211b, the cutting pressure adjusting spring 2 inserted in the sleeve 215
16 are provided.

As shown in FIG. 6, the origin position detecting circuit 21
3a and the detection signal of the winding amount detection circuit 214a are output to the arithmetic and control circuit 300, and the arithmetic and control circuit 300 calculates the grinding pressure adjustment signal accordingly. The amount of rotation of the grinding pressure adjustment motor 212 is adjusted according to an adjustment signal input to the motor drive circuit 212a.

The pulse motor 2 of the Z-axis direction drive mechanism 220
According to 21, the lens 201 before processing becomes a plurality of grinding portions (grinding stones) formed on the outer peripheral surface of the diamond wheel 261, for example, a grinding stone 261 a for rough grinding the lens 201 to be processed or a grinding stone 261 for beveling.
b is moved to each position. The pulse motor 221 of the Z-axis direction drive mechanism 220 has a clutch 224 via a pulley 223a, a belt 222 and a pulley 223b.
And the pulley 22 on the opposite side of the clutch 224
5, the moving plate 227
The storage box 202 is positioned in the Z-axis direction via. The amount of movement of the belt 226 via the pulley 228 is converted into the rotation angle of the light shielding plate 229a, and the origin position in the Z-axis direction is detected by the photo interrupter 229.

As shown in FIG. 6, the photo interrupter 2
The origin position detected by the reference numeral 29 is an origin position detecting circuit 229a.
Is output to the arithmetic control circuit 300, and the arithmetic control circuit 300 calculates a Z-axis position command signal according to the grinding data. Then, the Z-axis pulse motor 221 rotates according to a command signal input to the motor drive circuit 221a.

The lens 201 before processing is rotated about its lens axis 231 by the lens axis motor 232 of the lens rotating mechanism 230 to be processed. Lens axis motor 23
The rotation of 2 is transmitted to the lens shaft 231 by four pulleys 233 a to 233 d and two belts 234 a and 234 b, and the rotation angle of the lens 201 before processing is measured by an encoder 235 provided on the lens shaft 231.

As shown in FIG. 6, the rotation amount detection circuit 235a of the encoder 235 outputs the rotation angle signal counted by the counter circuit 235b to the arithmetic and control circuit 300. A rotation angle command signal is supplied to the motor drive circuit 232a so as to match the determined rotation angle θ of the lens 201 to be processed.

The lens pressing motor 241 of the lens chuck mechanism 240 for processing has the lens 2
01, or a motor that rotates so as to remove the processed lens, including a pulley 243a and a belt 242.
And a lens shaft 231 via a pulley 243b.

As shown in FIG. 6, the motor drive circuit 241
a from the arithmetic control circuit 300 to the lens 201 before processing.
Is supplied to the motor drive circuit 241a at a predetermined timing based on the exchange command of the
01 can be exchanged.

The Y-axis servo motor 252 of the Y-axis direction driving mechanism 250 is connected to one end of a screw shaft 254 parallel to the Y-axis via pulleys 253a and 253b by a belt 255,
The screw shaft 254 is rotated at a predetermined speed. And
The switching bar 256 screwed to the screw shaft 254 moves in the Y-axis direction by the rotation of the Y-axis servomotor 252, and is configured to press the switching button 257 from below in FIG. . The switching button 257 is provided at one end of the shield bar 257a, and a photo interrupter 257b for detecting the end of grinding is provided at the other end of the shield bar 257a. The shielding bar 257a is movable at the tip end of the sensor bar 251 in the Y-axis direction and is mounted via a predetermined elastic compression spring. The shielding bar 257a comes into contact with the switching bar 256 to push up the sensor bar 251 in the Y-axis direction. And regulates the positions of the storage box 202 and the base 203 in the Y-axis direction. The photo interrupter 257b is a shielding bar 25.
When the shielding bar 257a moves while the shutter 7a is pressed by the switching bar 256, the pressing center position of the unprocessed lens 201 moves downward in FIG. The other end of the screw shaft 254 is a belt 258
Encoder 25 for detecting the position in the Y-axis direction by using
9 are provided.

As shown in FIG. 6, the movement amount detected by the encoder 259 is output from a movement amount detection circuit 259a to a counter circuit 259b.
The count value at b is sent to the arithmetic and control circuit 300. Thus, the amount of movement of the shielding rod 257a is determined, and the rotation center of the lens 201 before processing and the diamond wheel 261 are determined.
The distance to the center of rotation can be measured. The Y-axis servo motor 252 is driven by lens frame grinding data instructed to the motor drive circuit 252a, and is controlled in relation to the rotation angle θ of the lens 201 to be processed. And
When the pre-processing lens 201 is ground over 360 °, the shielding bar 257a is no longer pushed by the switching bar 256 by the photo interrupter 257b for detecting the end of grinding, and a signal is output from the end-of-grinding detection circuit 257c. In response to this signal, the arithmetic and control circuit 300 inverts the rotation direction of the lens 201 before processing, and further instructs the timing to end the grinding.

In the diamond wheel rotating mechanism 260, when the grinding wheel rotating shaft motor 262 is driven, the pulley 264 is driven.
a, the diamond wheel 261 is rotated via the belt 263 and the pulley 264b.
Are simultaneously rotated. As shown in FIG. 6, the rotation of the grindstone rotating shaft motor 262 is controlled at a predetermined speed in accordance with an instruction from the arithmetic and control circuit 300 to the motor driving circuit 262a. In this manner, the grinding wheel 261a comes into contact with the peripheral portion of the lens 201 before processing, and the rough grinding is performed while rotating with each other.
The bevel processing is executed by b.

FIG. 7 shows a lens shape measuring section 130 and a lens shape measuring circuit 140 constituting the lens grinding apparatus of FIG.
FIG. The lens shape measuring unit 130 includes a measuring circuit 132 positioned in the Z-axis direction by a Z-axis pulse motor 131, and a + side position detecting circuit 133 and a − side position detecting circuit 134 each including an encoder. In the measuring circuit 132, a pair of tracing styluses 132a and 132b for measuring the position in the Z direction by making contact with the unprocessed lens 201 at the front and back positions thereof are minute in the + and − directions of the Z axis, respectively. It is slidably held by a distance. The pair of tracing styluses are respectively connected to two encoders.

The lens shape measuring circuit 140 includes a motor driving circuit 141 for driving the Z-axis pulse motor 131 and two counter circuits 142 and 143. The measurement position of the Z value of the lens to be processed 201 measured by the measurement circuit 132 is the rotational angle position of the moving radius corresponding to the lens frame data counted by the counter circuit 235b connected to the encoder 235 described above. The counter circuits 142 and 143 output the angle data Za and Zc to the arithmetic and control circuit 300.

In the arithmetic control circuit 300, the three-dimensional shape data (r _j , θ _j , Za _j ) and (r _j , θ _j , Z) are obtained from the angle data Za, Zc and the grinding data of the lens.
c _j ) is determined, whereby the contour of the lens to be processed 201 is determined for the entire circumference of the front and back surfaces.

When the bevel position and the bevel shape are set from the data input means 400, the arithmetic control circuit 300 creates grinding data necessary for the bevel grinding. That is, the bevel data input key 401 inputs a bevel curve value for setting the shape of the locus of the bevel apex and a Zb value for setting the Z-axis direction coordinate corresponding to the rotation angle θi of the lens 201 to be processed.

If it is determined from the image displayed on the display means 500 that the bevel position of the lens 201 before beveling is appropriate, the lens rotating mechanism 230
, While rotating the diamond wheel 261 to execute the beveling. However, when it is desired to correct the bevel position of the displayed image as a whole or partially, the bevel position is set again with the bevel data input key 401 and the desired bevel position is corrected while viewing the image on the display unit 500. Alternatively, the bevel shape itself can be corrected.

FIG. 8 is a block diagram showing an arithmetic and control circuit 300 for controlling the frame shape measuring section 110, the lens shape measuring section 130 and the lens grinding section 200a. CPU
In 301, predetermined calculation processing is performed on the input frame shape measurement data, lens shape measurement data, and the like, and the processing results are stored in the RAM 302. The ROM 303 has an arithmetic program for determining the geometric center of the lens frame described below, an arithmetic program for inverting the shape data of the lens frame, and a program for determining the left and right lens optical centers based on the shift amount data. An arithmetic program, an arithmetic program for obtaining an envelope corresponding to the radius value of the diamond wheel 261 from the shape data, and a lens frame so that the center axis of the lens axis is located on the envelope with respect to the center axis of the grinding wheel rotation axis. An arithmetic program for converting shape data into grinding data, an arithmetic program for calculating an expected three-dimensional shape after beveling, and the like are stored.

Next, regarding the measurement processing of the frame shape,
This will be described with reference to FIGS. FIG. 9 is a flowchart showing a frame shape measurement process. [S21] The spectacle frame 111 is fixed to a predetermined measurement position of the frame shape measuring means 110. [S22] The eyeglass frame left / right eye determination circuit 119a provided in the frame shape measuring means 110 determines whether the measurement position is the right frame or the left frame of the eyeglass frame 111. This is because the measured shape data is stored in the data storage area for the left or right lens frame set in the RAM 302 according to the measurement position of the spectacle frame 111. [S23] Eyeglass frame 1 in which the processed lens is framed
Reference line set at 11 and rotation angle θ from the reference point
_i (i is 0, 1,... n) based on the radial distance r _i ,
The shape data D ₁ (r _i , θ _i ) displayed in polar coordinates is stored as a measured value. That is, as shown in FIG. 10, the tracing stylus 112 moves along the inner peripheral groove of the rim, and the positions 112ao, 112a ₁ , 112a ₂ , 1 at predetermined time intervals.
The data of 12a ₃ ,..., 112ai are measured over the entire circumference of the lens frame, for example, data values of about 100 are measured, and the shape data displayed in polar coordinates with the direction of a horizontal line drawn inward from the measurement reference position Om of the frame being 0 °. Is stored as [S24] In order to determine the geometric center of the lens frame, R
Polar coordinate form data D stored in AM302
₁ (r _i , θ _i ) is converted into shape data D ₁ (X
_i , Y _i ). Here coordinate conversion _{formula, X i = r i cosθ i} , it is Y _i = r _i sinθ _i.

Next, among the orthogonal coordinate values D ₁ (X _i , Y _i ), each axis component X _i , Y _i is the maximum (Xmax, Y max).
Ymax), coordinate points A (Xa, Ymax), B (Xmin, Yb), C taking minimum (Xmin, Ymin) values
(Xc, Ymin) and D (Xmax, Yd) are determined,
Based on these coordinate point data, the X coordinate value Xp and the Y coordinate value Yp of the geometric center Op of the lens frame are obtained from the following equation.

Xp = (Xmax + Xmin) / 2 Yp = (Ymax + Ymin) / 2 [S25] Shape data D stored in RAM 302
₁ (X _i , Y _i ) is corrected to shape data D ₂ (X _j , Y _j ) (j is 0, 1,... N) with the origin at the geometric center Op. Here, X-coordinate values of the geometric center Op Xp, than Y coordinate value _{Yp, X j = X i -Xp} Y j = Y i from the relationship -Yp, each coordinate component shape data D ₂ to the Op origin Can be requested. [S26] geometry inverted center Op based on the data D ₃ of the lens frame (r _nj, θ _j) is determined. For this purpose, first, the shape data D ₂ (X _j , Y _j ) is inversely transformed into shape data D ₂ (r _j , θ _j ) in the form of polar coordinates.

From D ₂ (X _j , Y _j ) to D ₂ (r _j ,
The inverse conversion to θ _j ) can be calculated based on the relational expression of X _j ² + Y _j ² = r _j ² arctan (Y _j / X _j ) = θ _j .

In step S22, the right frame is determined.
And the inverse transformation causes the right lens frame
Shape data D in polar coordinate format with the geometric center Op as the origin
_Two(R_j, Θ_j) Is required. Furthermore, right
Lens frame shape data D whose origin is the geometric center of the frame_Two
(R_j, Θ_j) J-th rotation angle θ_jRadial distance data
Angle of rotation θ_njReplace with radial distance data of
Data D_Three(R_nj, Θ_j). Right frame shape data
D_TwoIs a data string D of 100 points, for example._Two(R ₀,
θ₀), D_Two(R₁, Θ₁), ... D_Two(R₉₉, Θ₉₉)When
These data columns, if required.
Row D_Three(R₉₉, Θ₀), D_Three(R₉₈, Θ₁), ... D_Three
(R₀, Θ₉₉) To modify the shape data D of the left frame._Three
Can be determined as a data sequence of 100 points.

If the determination in step S22 is that the frame is the left frame, the shape data of the right frame can be obtained in the same manner. [S27] The shape data D ₃ (r _nj , θ _j ) obtained as the shape data in the polar coordinate format is converted into the shape (Xk, Yk) in the rectangular coordinate format.

In the frame shape measurement processing shown in FIG. 9, the shape data of the left and right lens frames of the frame in which the processed lens is to be framed are obtained with the geometric center of the lens frame as the origin. As a result, as described below, the shape data correction process is executed based on the independent shift amount. Therefore, even when the left and right shift amounts are different from each other, it is possible to perform lens grinding with an appropriate shift amount without separately measuring the shapes of both lens frames unlike a conventional lens grinding device.

Next, in order to correct the pair of shape data for the left and right lens frames of the frame to a pair of grinding data with the lens optical center as the origin, the eye position of the spectacle wearer is measured in advance. The shift amount (ΔX _R , ΔY _R ) of the right eye is input from the numerical key 401 among the shift amounts related to the deviation. In addition, the shape data D ₂ (X _j , Y _j ) obtained in step S25 of the previous measurement processing is transferred from the RAM 302 to the CPU.
Read to 301.

Here, a method of correcting the shape data of the right lens frame will be described. As shown in FIG. 11, when the distance to the position of the pupil of the right eye with respect to the center of the eyeglass frame 111 is R (mm), the X-axis component ΔX _R of the shift amount of the right eye is ΔX _R = (FPD / 2) -R. Accordingly, the lens optical center Os (Xs, Ys) is obtained as Xs = −ΔX _R = − (FPD / 2) + RYs = −ΔY _R in the orthogonal coordinate system having the origin at the geometric center Op. Here, ΔY _R means a deviation in the height direction between the geometric center of the spectacle frame 111 and the pupil position of the right eye.

The shape data D ₂ (X _j , Y _j ) read from the RAM 302 is converted into shape data D ₄ (X _i , Y _i ) (i = 0, 1,... N) with the lens optical center Os as the origin. ). Each coordinate component shape data D ₂ to the lens optical center Os orthogonal coordinate system to the geometrical center Op origin (Xs, Ys), the lens optical center Os and _{origin, X i = X j - {} (FPD / 2) -R} can be obtained by Y _i = Y _j -ΔY _R relationship. Further, the shape data D ₄ (X _i , Y _i ) is converted into the shape data D in the polar coordinate format.
₄ (r _{i, θ i)} is converted back to.

This inverse conversion is performed in step S of the previous measurement process.
26 in the same manner as can be calculated based on the relational expression _{^{X i 2 + Y i 2 =}} r i 2 arctan (Y i / X i) = θ i. By this inverse transformation, the shape data D ₄ (r _i , θ _i ) in the polar coordinate system having the origin at the lens optical center Os of the right lens frame is obtained.

Based on the shape data D ₄ (r _i , θ _i ), the new grinding data D ₅ (r _j , θ _j ) in which the rotation angle data θ when displayed in polar coordinates form an arithmetic progression It is preferable to correct it.

Similarly, the left-eye shift amount (ΔX _L , ΔY _L )
Is input from the numeric key 402 and the shape data D ₃ (X _k ,
Y _k ) is read from the RAM 302 to the CPU 301, and
The shape data of the left lens frame is corrected, and a pair of grinding data for the left and right lenses is created.

In the above description, the shape data of the lens frame is actually measured from one side of the spectacle frame 111. However, the shape data of the frame in which the lens to be processed is framed is stored in the IC card in advance and the IC card is stored. It can also be input from a card input device.

Thus, the frame shape measuring section 110
The frame shape measured in is corrected to the grinding data,
It is stored in the arithmetic control circuit 300. This grinding data
It is used by the lens grinding means 200 to roughly grind the periphery of the lens 201 to be processed so as to match the frame shape. It is also used by the lens shape measuring unit 130 to simultaneously measure the Z value for each predetermined angle of the lens rotation axis from the front and back surfaces of the lens.

The shape data for beveling the lens 201 before processing is three-dimensional shape data (r _j , θ _j , Z
a _j ), (r _j , θ _j , Zc _j ) and bevel vertex shape data (r _j , θ _j , Zb _j ).
The image data of the lens 201 to be processed after the beveling is formed by combining the various types of shape data.

The procedure for displaying the bevel position after the rough grinding of the peripheral edge of the spectacle lens is completed and prior to the bevel processing will be described below. FIG. 12 is a flowchart showing the procedure for displaying the bevel position according to the present invention. [S1] Based on the grinding data 330, the grindstone 261a
The peripheral edge of the lens to be processed 201 before the beveling is roughly ground according to the shape of the spectacle frame. Here, the lens to be processed 201 before the beveling is processed into a shape slightly larger than the inner peripheral shape of the rim of the spectacle frame. [S2] First, the three-dimensional shape of the lens to be processed 201 corresponding to the right lens frame is measured by the lens shape measuring circuit 140. From the lens shape measuring circuit 140, the Z values of the front and back surfaces corresponding to the grinding data D ₅ (r _j , θ _j ) of the lens to be processed 201 are measured as angle data Za and Zc. [S3] An expected shape of the lens to be processed 201 after the beveling is calculated. In this calculation, the three-dimensional shape data (r _j , θ _j , Za _j ) and (r _j , θ _j , Zc
_j ), the lens edge thickness (peripheral thickness) ΔZ for each rotation angle {θ _j } forming an arithmetic progression is obtained as | Zc _j −Z a _j |. These shape data are stored in the RAM 302.

[S4] The bevel position is set by inputting a Z value for specifying the bevel apex position for each rotation angle {θ _j } from the bevel data input key 401. In addition to the method for setting the bevel position, a method for automatically setting the bevel apex at the center of the peripheral edge thickness of the lens, the bevel curve (CL) of the lens, and the bevel apex position at an arbitrary rotation angle θ _j There is a way to just enter. In either case, the bevel shape data (r _j , θ _j , Z
b _j ) is obtained for the entire circumference of the lens. [S5] The three-dimensional shape data obtained in steps S3 and S4 are converted into data in a rectangular coordinate system. That is, (r _j ,
theta _j, from _{Za j) (X j, Y} j, the Za _j),
From (r _j , θ _j , Zb _j ) to (X _j , Y _j , Zb _j )
From (r _j , θ _j , Zc _j ) to (X _j , Y _j , Z
c _j ) is calculated.

[S6] The display means 500 decomposes the image into display data for the necessary front image 510 and four side images 520, and displays the image. For image display in the front image 510 of the workpiece lens 201 after beveling, display data is generated for example _{(X j, Y j, Za} j) from (X _j, Y _j) extracts the component . In order to display the side image 522 viewed from above the lens, data having a positive Y _j component value is selected from the three orthogonal coordinate data, and the (X _j , Z _j ) component is extracted from each of the data. Display data is created. In order to display the side image 523 viewed from below the lens, data having a negative Y _j component value is selected from the three orthogonal coordinate data, and (X
_j , Z _j ) components are extracted to create display data.

Side images 524 and 52 viewed from the ear and nose sides
As display data for displaying the image No. 5, data in which the X _j component values are respectively positive and negative are selected from the three orthogonal coordinate data, and the (Y _j , Z _j ) component may be extracted from each data. . [S7] The bevel position is determined from the displayed image, and if so, the process proceeds to the next step S8. If it is determined that the bevel position needs to be further corrected, the process returns to step S4 and the bevel position is set. Reset. When resetting the bevel position, a reset signal for the display screen is input from the data input unit 400, and the image displayed on the display unit 500 is erased. [S8] A beveling process is instructed to the lens grinding means 200 based on the grinding data, and the right-side lens 201 to be processed is beveled. In this beveling processing, bevel shape data (r _j , θ _j , Zb
_In accordance with _j ), the pulse motor 221 of the Z-axis direction drive mechanism 220 is driven, and the diamond wheel 261 is rotated until the bevel position of the lens 201 to be processed reaches the Z value corresponding to all Zb _j , and the same as in rough machining. Then, beveling is formed on the entire circumference of the lens 201 to be processed.

Similarly, after the peripheral edge of the lens to be processed 201 on the left side is ground in step S1, the bevel position can be displayed and the bevel position can be determined prior to the bevel processing. In the above description, the bevel position is displayed after the peripheral edge of the processing target lens 201 is ground.
The bevel position can be displayed by measuring the lens shape in the state of the circular processed lens.

[0064]

As described above, according to the present invention, from the three-dimensional expected shape of the lens to be processed after the beveling , the four sides of the lens side including the lens beveling position are obtained.
A plurality of images from different directions can be simultaneously displayed on the screen together with the front image of the lens , and the bevel position can be accurately and intuitively grasped in relation to the entire three-dimensional shape of the lens to be processed when the bevel processing is performed.

Further, based on the inner peripheral shape of the lens frame of the spectacle frame and the deviation data of the geometric center of the inner peripheral shape with respect to the position of the lens rotation axis for rotating the lens to be processed, for each shape data displayed in polar coordinates. The bevel position is set by measuring the three-dimensional shape on the front and back surfaces of the lens including the Z axis set in parallel with the lens rotation axis, so that the three-dimensional expected shape can be easily calculated and processed. An accurate bevel position can be specified by polar coordinate data measured with reference to a reference line set perpendicular to the lens optical axis of the lens and an origin set at the intersection of the reference line with the lens rotation axis.

[0066]

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a bevel position display device according to the present invention.

FIG. 2 is a diagram illustrating an example of a screen configuration of a display unit.

FIG. 3 is a detailed view showing a frame shape measuring unit constituting the lens grinding device.

FIG. 4 is a block diagram showing a frame shape measuring circuit.

FIG. 5 is a detailed view showing a lens grinding unit constituting the lens grinding device.

FIG. 6 is a block diagram illustrating a lens grinding circuit.

FIG. 7 is a block diagram illustrating a lens shape measurement unit and a lens shape measurement circuit.

FIG. 8 is a block diagram illustrating an arithmetic and control circuit that controls a frame shape measuring unit, a lens shape measuring unit, and a lens grinding unit.

FIG. 9 is a flowchart illustrating a frame shape measurement process.

FIG. 10 is an explanatory diagram showing a method of measuring a frame shape.

FIG. 11 is an explanatory diagram showing a method of calculating the position of the geometric center of the frame shape.

FIG. 12 is a flowchart showing a procedure of displaying a bevel position according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 shape data measuring means 200 lens grinding means 201 lens to be processed 300 arithmetic control circuit 400 data input means 500 display means

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B24B 9/14

Claims (3)

(57) [Claims] 1. A bevel position display device for displaying a bevel position on a screen prior to beveling of a lens to be processed before being beveled to be framed in an eyeglass frame, comprising: Shape data measuring means for measuring the three-dimensional shape of the lens before beveling corresponding to the inner peripheral shape of the lens frame portion; and data for setting bevel data for specifying the bevel position of the lens before beveling Setting means; calculating means for calculating an expected three-dimensional shape of the lens to be processed after the beveling based on a three-dimensional shape of the lens to be processed, a bevel position and a beveled shape of the lens to be processed, The image from the four directions ( up , down, left, and right) of the lens side including the lens bevel position for the expected shape calculated by the calculation means
Display means for simultaneously displaying a plurality of images on the screen together with the front image of the lens , and a bevel position display device. 2. The shape data measuring means based on deviation data of a geometric center of the inner peripheral shape with respect to an inner peripheral shape of a lens frame of the eyeglass frame and a position of a lens rotation axis for rotating the lens to be processed. A reference line set perpendicular to the lens optical axis on the lens to be processed, and for each shape data displayed in polar coordinates with reference to an origin set at the intersection of the reference line and the lens rotation axis, 3 on the front and back surfaces of the lens including the Z axis set in parallel with the lens rotation axis
The bevel position display device according to claim 1, wherein a dimensional shape is measured. 3. The apparatus according to claim 1, wherein the data setting unit includes a correction unit configured to correct a bevel shape and a lens bevel position of the lens to be processed based on an expected shape displayed on a screen of the display unit. The bevel position display device according to the above.