JPH0674756A - V-groove setting method for spectacle lens - Google Patents

Abstract

PURPOSE:To obtain a V-groove setting method for spectacle lens through which a lens subjected to V-grooving can be fit positively to a spectacle frame. CONSTITUTION:A V-groove is set in the edge of a spectacle lens based on a designated V-groove mode (S35-S37, S41, S42) and then deformation of spectacle frame shape is calculated when it is fit to the V-groove thus set (S38-S40, S41, S42). Thus calculated deformation is then compared with a preset limit value and validity of deformation is decided based on the comparison results and reflected on the setting of V-groove (S43). The limit value is set depending on the material of spectacle frame (S43).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectacle lens bevel setting method for setting a bevel on an edge of a spectacle lens fitted to a deformable spectacle frame, and particularly, it is sent from a spectacle store side via a communication line. The present invention relates to a spectacle lens bevel setting method in a bevel processing design calculation performed before rim processing and bevel processing of a spectacle lens performed on the lens processing side based on spectacle frame shape data and spectacle lens information.

[0002]

2. Description of the Related Art A processing side of an eyeglass lens calculates a desired lens shape including a bevel shape based on information about an eyeglass lens or an eyeglass frame sent from an ordering side of the eyeglass lens, and based on the result, bevel processing is performed. Information on whether or not lens processing is possible, and the expected finish shape of the spectacle lens, including the beveled shape, is returned to the ordering side, and the ordering side sends the possibility information or finish. The predicted shape is displayed on the screen to check whether lens processing including beveling is possible, or the predicted finished shape is confirmed, and based on this confirmation, the optimal spectacle lens with the bevel is determined. The applicant of the present invention has proposed a system for supplying a spectacle lens to be ordered (Japanese Patent Application No. 4-165912).

The realization of this system is premised on that the beveling design is properly performed. In particular, it is necessary that the beveling design is performed in advance so that the spectacle frame can be appropriately fitted to the beveled lens.

On the other hand, in the conventional beveling design, the eyeglass frame is not deformed, and the bevel is simply set on the edge of the lens according to the shape of the three-dimensional eyeglass frame, or the eyeglass frame is processed by the machining axis ( Assuming deformation in the Z-axis direction,
A bevel is set on the edge of the lens according to the shape of the lens surface (for example, Japanese Patent Laid-Open No. 3-13571).
No. 0, JP-A-3-166050). In the former method, the appearance of the finished spectacles is not beautiful, so when using a spectacle frame made of a deformable material, set the bevel position according to the lens surface shape as in the latter method. It has been practiced to fit the beveled lens into the spectacle frame while deforming in the processing axis (Z axis) direction.

[0005]

However, in the conventional beveling design, in the latter method, which is the method of setting the bevel on the premise of the deformation of the eyeglass frame, there is a limit to the deformation of the eyeglass frame. However, the beveling process was designed without considering such limits. Therefore, when the beveled lens is actually fitted to the spectacle frame, the spectacle frame may not be completely deformed and the lens cannot be fitted to the spectacle frame.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a spectacle lens bevel setting method capable of securely fitting a beveled lens to a spectacle frame.

[0007]

In order to solve the above-mentioned problems, the present invention sets a bevel on the edge of a spectacle lens based on a designated bevel mode, and shapes the spectacle frame so as to match the set bevel. Calculating the amount of deformation of the spectacle frame shape when deformed, comparing the calculated amount of deformation with a preset predetermined limit value, and determining whether or not the spectacle frame shape can be deformed based on the result of the comparison, A spectacle lens bevel setting method is provided, which is characterized in that it is reflected in the bevel setting.

The predetermined limit value is set according to the material of the spectacle frame.

[0009]

In the above structure, first, the bevel is set on the edge of the spectacle lens based on the designated bevel mode.

Next, the deformation amount of the spectacle frame shape when the spectacle frame shape is deformed so as to match the set bevel is calculated, and the calculated deformation amount is compared with a predetermined limit value set in advance. To do.

Based on the result of this comparison, it is determined whether or not the shape of the spectacle frame can be deformed, and this is reflected in the bevel setting. That is, if the calculated deformation amount exceeds a predetermined limit value,
The shape of the eyeglass frame cannot be deformed, and the designated position of the bevel is set to be inappropriate.

As a result, the designated position of the bevel is changed, and as a result, the bevel is set so that the beveled lens can be reliably fitted into the spectacle frame. Further, a predetermined limit value is set according to the material of the spectacle frame. Generally, the tolerance of deformation of the spectacle frame differs depending on the material of the spectacle frame, but with this, it is possible to appropriately cope with the difference in the tolerance, and the bevel setting that can reliably fit the beveled lens to various spectacle frames It will be possible.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is an overall configuration diagram of an eyeglass lens supply system in which the eyeglass lens bevel setting method of the present invention is implemented. A public communication line 300 connects the spectacle store 100 on the ordering side and the lens maker's factory 200 on the lens processing side. Although only one spectacle store is shown in the figure, a plurality of spectacle stores are actually connected to the factory 200.

In the spectacle store 100, an online terminal computer 101 and a frame shape measuring instrument 102 are installed. The terminal computer 101 includes a keyboard input device and a CRT screen display device, and is connected to the public communication line 300. The spectacle frame actual measurement value is input to the terminal computer 101 from the frame shape measuring device 102 to perform arithmetic processing, and the spectacle lens information, prescription value and the like are input from the keyboard input device.
The output data of the terminal computer 101 is sent to the mainframe 2 of the factory 200 via the public communication line 300.
01 transferred online.

The main frame 201 is provided with a spectacle lens processing design program, a bevel processing design program, etc., calculates a lens shape including a bevel shape based on the input data, and outputs the calculation result via the public communication line 300. And returns the result to the terminal computer 101 and displays it on the screen display device, and the calculation result is displayed on each terminal computer 210, 220, 230, 240, 250 of the factory 200.
To be sent via the LAN 202.

A rough rubbing machine (curve generator) 211 and a sand polishing machine 212 are connected to the terminal computer 210, and the terminal computer 210 follows the calculation result sent from the main frame 201.
By controlling the sand polishing machine 212, the back surface (rear surface) of the lens, the front surface of which has been previously processed, is finished.

A lens meter 221 and a wall thickness meter 222 are connected to the terminal computer 220. The terminal computer 220 sends the measured values obtained by the lens meter 221 and the wall thickness meter 222 and the main frame 201. By comparing the calculated results with the acceptance results of the lens whose curved surface back surface (rear surface) is completed, a mark (three-point mark) indicating the optical center is given to the acceptable lens.

The terminal computer 230 has a marker 23.
1 and the image processor 232 are connected, and the terminal computer 230 determines a blocking position at which the lens should be blocked (held) when edging and beveling the lens according to the calculation result sent from the main frame 201. It is also used to make blocking position marks. The jig for blocking is fixed to the lens according to the blocking position mark.

An NC-controlled lens grinding device 241 consisting of a machining center and a chuck interlock 242 are connected to the terminal computer 240, and the terminal computer 240 carries out edging of the lens according to the calculation result sent from the main frame 201. And beveling.

To the terminal computer 250, a bevel apex shape measuring device 251 is connected, and the terminal computer 25
0 compares the peripheral length and the shape of the bevel-processed lens measured by the shape measuring device 251 with the calculation result sent from the main frame 201 to determine whether or not the processing is successful.

The flow of processing until the spectacle lens is supplied in the system having the above configuration will be described below with reference to FIGS.
This will be described with reference to FIG. In addition, in this processing flow,
There are two types, “inquiry” and “order”. In the “inquiry”, the spectacle store 100 sends the factory 2 to notify the expected lens shape at the completion of lens processing including beveling
00, and “ordering” is that the spectacle store 100 requests the factory 200 to send the lens before edging or the lens after beveling.

FIG. 3 is a flow chart showing the flow of the first input processing in the spectacle store 100. In the figure, the number following S represents a step number. [S1] The lens order inquiry processing program of the terminal computer 101 of the spectacle store 100 is started, and the order entry screen is displayed on the screen display device. Eyeglass store 100
While viewing the order entry screen, the operator specifies the type of lens to be ordered or inquired by using the keyboard input device.

That is, the lens type designation, ordering, or inquiry about whether the lens to be ordered is a beveled lens or a lens not subjected to edging and beveling, the lens thickness Is specified to be the minimum required value, the chamfering is performed to make the edge of the minus lens inconspicuous, and the polishing is finished for that part.

[S2] The color of the lens is designated. [S3] A lens prescription value, a lens processing specification value, spectacle frame information, layout information, bevel mode, bevel position, and bevel shape are input. Layout information is
The eyepoint position, which is the position of the pupil on the lens, is designated.

The lens processing designation value is the lens thickness,
You can enter the specified values for edge thickness, prism, eccentricity, outer diameter, and lens surface curve (base curve). The bevel mode has modes of "1: 1", "1: 2", "convex tracing", "frame tracing", and "auto-beveling" depending on where the lens edge is placed.
Select from them and enter. Here, for example, “convex patterning” is a mode in which a bevel is formed along the front surface of the lens.

The input of the bevel position is effective only when the bevel mode is “convex”, “frame”, and “auto-bevel”, and the position of the bottom of the bevel surface is located rearward from the front surface of the lens. This is specified by 0.5 mm. Even if the frame is thick and the distance from the front of the frame to the bevel groove is long,
By inputting this bevel position, the bevel apex can be positioned so that the front surface of the lens is along the front surface of the frame.

The bevel shape is selected and input from "standard bevel", "comb bevel (bevel for combination frame)", "grooving" and "planar beveling". "Combined bevel" is designated when a frame member is provided with a decorative member and the lens hits the decorative member. "Grooving",
The “flattening” is not so-called beveling, but is specified here.

[S4] Here, it is determined whether or not the measurement of the spectacle frame shape by the frame shape measuring machine 102 of FIG. 2 has already been completed for the target frame. If completed, the process proceeds to step S7, and if not completed, the process proceeds to step S5.

[S5] First, in the terminal computer 101 of the spectacle store 100, processing is passed from the lens order inquiry processing program to the frame shape measurement program. Then, the measurement number attached to the spectacle frame whose shape is to be measured is input. In addition, the material of the frame (metal, plastic, etc.) is specified, and further, whether or not the frame can be bent is specified. The material of the frame is used in the calculation of step S12 as a parameter for correcting the peripheral length of the bevel apex according to the material so that the lens fits exactly into the frame when the lens is fitted into the frame. If there is a designation that the frame cannot be bent, and if the lens cannot be put in the frame without bending the frame, in order not to receive an order, the spectacle store 100
Display an error message on the screen display device.

[S6] The spectacle frame to be measured is fixed to the frame shape measuring device 102 and the measurement is started. The frame shape measuring device 102 brings the measuring element into contact with the bevel grooves of the left and right frames of the spectacle frame, and rotates the measuring element around a predetermined point so as to obtain cylindrical coordinate values (Rn, θn, Z) of the shape of the bevel groove.
n) (n = 1, 2, ..., N) is detected three-dimensionally,
The data is sent to the terminal computer 101. In the terminal computer 101, smoothing of those data is performed (the smoothing may not be necessary in some cases), the center coordinates (a, b, c) of the toric surface, the base radius RB, the cross radius RC, and the rotational symmetry axis of the toric surface. Direction unit vector (p, q, r) or frame curve CV (curvature of the spherical surface when the frame is considered to be spherical), bevel groove perimeter FLN, frame PD (pupil distance) FPD , Frame nose width DBL, A and B sizes that are the maximum widths of the left and right and top and bottom of the frame, effective diameter ED (a value that is twice the maximum moving radius), and tilt angle TILT that is the angle formed by the left and right frame. . Then, these calculated data are displayed on the screen display device. If the data is greatly disturbed or there is a large difference between the left and right frame shapes, an error message to that effect is displayed on the screen display device.

In the spectacle store 100, when an error message indicating that the data is greatly disturbed is displayed on the screen display device, there is no adhered matter in the frame groove, or the seam of the frame frame is displaced, or Check if the measurement is taken with the gap left open and repeat the measurement. Also,
If an error message indicating that there is a large difference in the shapes of the left and right frame frames is displayed on the screen display device, if the difference is permissible, enter a confirmation that this is okay. If it is not allowed, you may correct the spectacle frame shape by hand and then measure again, or calculate the average of the left and right shapes and use this as the spectacle frame shape value to specify the merging specification. You may enter.

[S7] The spectacle frame shape has already been measured,
When the result is stored, the measurement number attached to the spectacle frame is input in order to read the stored measurement value.

[S8] The spectacle frame shape information stored for the corresponding spectacle frame is read from the internal storage medium according to the measurement number. [S9] Designate "inquiry" or "order".

Data such as lens information, prescription values, frame information and the like obtained by executing the above steps is transferred via the public communication line 300 to the mainframe 20 of the factory 200.
Sent to 1. During the transmission, the terminal computer 101 of the spectacle store 100 displays a message indicating that the transmission is in progress. When ordering lenses, group transmission can be used, which can collectively transmit a maximum of, for example, 15 cases at a time to shorten the communication time. In group transmission, the order contents of each case are confirmed, temporarily stored, and then collectively transmitted.

FIG. 4 is a flow chart showing the flow of processing in the factory 200 and the steps of confirmation and error display performed in the spectacle store 100 by transfer from the factory 200. In the figure, the number following S represents a step number.

[S11] Mainframe 2 of factory 200
01 includes a spectacle lens ordering system program, a spectacle lens processing design program, and a bevel processing design program. When data such as lens information, prescription values, frame information and the like is sent via the public communication line 300, the eyeglass lens processing design program is started via the eyeglass lens ordering system program, and lens processing design calculation is performed.

First, based on the frame shape information, prescription value, and layout information, it is confirmed whether or not the outer diameter of the designated lens is insufficient. If the outer diameter of the lens is insufficient, the shortage direction and the shortage amount in the boxing system are calculated, and the process is returned to the eyeglass lens ordering system program for displaying on the terminal computer 101 of the eyeglass store 100.

If the outer diameter of the lens is sufficient, the front curve of the lens is determined. This is determined by first determining the right and left front curves according to the left and right prescription values of the lenses, and then aligning the left and right front curves. It should be noted that this step is skipped in the case of the aspherical single focus lens in which it is prohibited to align the left and right front curves. If necessary, the table curve here is approximated by quadratic and quartic aspherical surfaces in an aspherical single-focus lens, and by quadratic and quartic aspherical surfaces in each direction in a progressive multifocal lens. Has been done.

Next, the thickness of the lens is determined. Normal,
Since the outer diameter of the lens is determined by the prescription value, the lens thickness is determined by the outer diameter, the standard edge thickness, and the prescription value. In addition, when the processing designation that sets the lens thickness to the minimum necessary value is set, the edge of the entire circumference is covered for each radius vector in each direction of the frame by the eyeglass frame shape information, the layout information, and the prescription value. To determine the thickness of the lens along the specifications.

After the thickness of the lens is determined, the back curve of the lens, the prism, and the prism base direction are calculated, thereby determining the overall shape of the lens before the edging process. Here, the edge thickness of the entire circumference is checked for each radius vector in each direction of the frame, and it is confirmed whether or not there is a portion having a thickness less than the required edge thickness. If there is a point below, the shortage direction and the shortage amount in the boxing system are calculated, and the process is returned to the eyeglass lens ordering system program for displaying on the terminal computer 101 of the eyeglass store 100.

If there is no shortage of the edge thickness on the entire circumference, the lens weight, the maximum and minimum edge thicknesses, their directions, etc. are calculated. Then, an instruction value for the terminal computer 210 of the factory 200, which is necessary for processing the back surface (rear surface) of the lens, is calculated.

The above calculation is performed by the terminal computer 210,
By the rough rubbing machine 211 and the sanding polishing machine 212,
This is necessary when the lens polishing process before the edging process is performed, and various calculated values are passed to the next step.

Further, when a stock lens which has already been processed is designated and the lens polishing process before the edging process is not performed, the lens outer diameter, the lens thickness, the table curve, Since the back curve is predetermined and those data are stored, read those values to check whether the outer diameter of the lens and the edge thickness are the same as in the back processed product. Pass to the next step. Also in the case of the stock lens, the surface curve of the aspherical single-focus lens or the progressive multifocal lens is approximated to an aspherical surface as needed, as in the case of the polished lens.

[S12] Next, the main frame 201
Then, the bevel processing design program is started via the eyeglass lens ordering system program, and the bevel processing design calculation is performed.

First, the three-dimensional data of the eyeglass frame shape is corrected according to the material of the eyeglass frame, and the error of the eyeglass frame shape data due to the material of the eyeglass frame is corrected. Next, the positional relationship between the spectacle frame shape and the spectacle lens is three-dimensionally determined based on the eye point position.

A machining origin serving as a reference when holding a lens for carrying out bevel machining and a machining axis which is a rotation axis are determined, and the coordinates of the data so far are converted into the machining coordinates. Then, the three-dimensional bevel tip shape is determined according to the designated bevel mode. At that time, the expected deformation amount is calculated on the assumption that the three-dimensional bevel tip shape is deformed without changing the bevel circumference. When the bevel mode is a frame or when the frame cannot be bent, it cannot be deformed. If the bevel does not stand unless it is deformed, an error code to that effect is output.

The calculated amount of deformation is compared with the limit amount of deformation provided for each material of the spectacle frame, and if it exceeds the limit amount, an error code to that effect is output. In addition,
By deforming the three-dimensional bevel tip shape, the eyepoint position shifts, so the error is corrected.

As described above, the design calculation for the three-dimensional beveling is performed. The details of step S12 will be described later with reference to FIG. [S13] If the designation in step S9 of FIG. 2 is "order", the process proceeds to step S15, while if "inquiry", the result of the inquiry is sent to the terminal computer 101 of the spectacle store 100 via the public communication line 300. , And proceeds to step S14.

[S14] Mainframe 2 of factory 200
On the basis of the result of the inquiry sent from 01, the terminal computer 101 displays the expected shape of the lens at the time of the completion of the beveling or the error condition on the screen display device. The operator of the spectacle store 100 changes or confirms the designated input information according to the displayed contents.

That is, if no error occurs in the processing design calculation in steps S11 and S12 of FIG. 4, the lens thickness and the lens weight are sequentially displayed on the screen of the image display device of the terminal computer 101 of FIG. Order entry incoming screen to display, layout confirmation diagram that visually shows how the lenses are arranged according to the layout information specified in the eyeglass frame, left and right lenses framed in the frame and spatially arranged 3D view from any direction, bevel confirmation drawing that shows the shape of the lens and the positional relationship between the edge and the bevel in detail, left and right bevel balance that develops the edge thickness and bevel position of both the right and left lenses along the bevel Display the figure.

If an error occurs in the machining design calculation in steps S11 and S12 of FIG. 4, a message corresponding to the content of the error is displayed on the screen display device of the terminal computer 101 of FIG. To be done.

[S15] If the designation in step S9 of FIG. 3 is "order", this step is executed and step S1
It is determined whether or not an error has occurred in the machining design calculation in 1 and step S12. If an error has occurred, the result is sent to the spectacle store 10 via the public communication line 300.
0 to the terminal computer 101, and the process proceeds to step S17. On the other hand, if no error has occurred, the result is sent to the terminal computer 101 of the spectacle store 100 via the public communication line 300, and the process proceeds to step S16.
After step S18 (FIG. 5), the actual processing is executed.

[S16] A message "Order received" is displayed on the screen display device of the terminal computer 101 of the spectacle store 100. As a result, it can be confirmed that the lens before edging or after beveling that can be reliably framed in the frame can be ordered.

[S17] Since the ordered lens is a lens that cannot be processed due to an error in the lens processing design calculation or the bevel processing design calculation, a message indicating "Order not accepted" is displayed.

FIG. 5 is a flow chart showing the actual steps such as polishing of the back surface of the lens, edging of the lens, and beveling performed in the factory 200. The number following S represents a step number. Hereinafter, description will be given with reference to FIG.

[S18] If "order" is specified in step S9 and no error has occurred in the lens / bevel machining design calculation, this step is executed. That is, in advance, the lens processing design calculation result in step S11 is the terminal computer 2 of FIG.
10 has been sent to the rough rubbing machine 211 and sanding polishing machine 2
12, the curved surface of the back surface of the lens is finished according to the sent calculation result. Further, dyeing and surface treatment are performed by a device (not shown), and the process up to the edging process is performed. If a stock lens is designated, this step is skipped.

[S19] The quality inspection of the optical performance and the appearance performance is performed on the spectacle lens processed before the edging by the execution of step S18. For this inspection, the terminal computer 220, the lens meter 221, and the wall thickness meter 222 of FIG.
Is used to make a three-point mark indicating the optical center. When the lens before edging is ordered from the eyeglass store 100, the lens is shipped to the eyeglass store 100 after the quality inspection is performed.

[S20] Based on the result calculated in step S12, the terminal computer 230 and the marker 2 in FIG.
31, a block jig for holding the lens is fixed to a predetermined position of the lens by the image processor 232 and the like. That is, the image processor 232 photographs the front surface of the spectacle lens with a TV camera, displays the image on the CRT screen, and further displays the image of the layout mark of the lens before edging on the image. Here, the position of the lens is determined so that the layout mark image displayed on the CRT screen matches the three-point mark formed on the lens, and the position where the block jig is fixed is determined. Then, with the marker 231, a blocking position mark indicating the position where the block jig is to be fixed is painted on the lens. The block jig is fixed to the lens according to the blocking position mark.

[S21] The lens fixed to the block jig is attached to the lens grinding device 241 shown in FIG. Then, in order to grasp the position (inclination) of the lens mounted on the lens grinding device 241, at least three positions on the front surface or the rear surface of the lens, which are designated in advance, are measured. The measured value obtained here is stored for use as calculation data in step S22.

[S22] The main frame 201 of FIG. 2 performs the same calculation as the beveling design calculation of step S12. However, in actual processing, an error may occur between the calculated lens position and the actual lens position, so this error is corrected when the coordinate conversion into the processed coordinates is completed. That is, the error between the calculated lens position and the actual lens position is corrected based on the position measurement values of the three points measured in step S21.
Otherwise, the same calculation as the bevel machining design calculation of step S12 is performed to calculate the final three-dimensional bevel tip shape.

Then, based on the calculated three-dimensional bevel tip shape, three-dimensional processing locus data on the processing coordinates when grinding with a grindstone having a predetermined radius is calculated. A detailed description of the contents of this step will be given later with reference to FIG. 19 after the detailed description of step S12.

[S23] The processing trajectory data calculated in step S22 is sent to the NC-controlled lens grinding device 241 via the terminal computer 240. The lens grinding device 241 has a rotary grindstone for grinding which is controlled in the Y-axis direction (direction perpendicular to the spindle axis direction) to carry out edging and beveling of the lens, and also of a block jig for fixing the lens. NC control grinding machine capable of at least three-axis control: rotation angle control (spindle axis rotation direction) and Z-axis control for performing beveling by moving a grindstone or lens in the Z-axis direction (spindle axis direction). According to the sent data, the edging of the lens and the beveling are performed. Although the lens grinding device 241 performs grinding with a grindstone, a cutting device that includes a cutter and performs cutting can be used instead.

[S24] The terminal computer 250 and the bevel apex shape measuring device 251 measure the peripheral length and the shape of the bevel apex of the bevel-finished lens. That is, the lens, which has been processed in step S23, is taken out and attached to the shape measuring instrument 251 with the block jig and tool attached, and the bevel apex measuring probe is brought into contact with the bevel apex of the lens to start the measurement. Let The measured value is input to the terminal computer 250 and displayed on the display device.

Then, the terminal computer 250 sets the design bevel apex circumference obtained by the calculation in step S12,
Comparing with the measurement value measured by the shape measuring device 251,
If the difference between them is, for example, within 0.1 mm, it is judged as a passing product.

The design A size and design B size of the frame created by the calculation in step S12 are compared with the A size and B size measured by the shape measuring device 251, and the difference between them is, for example, 0. If it is within 1 mm, it is judged as a passing product.

[S25] The bevel position and the shape of the lens for which the bevel processing is completed are compared with the bevel position drawing drawn on the processing instruction prepared based on the result calculated in step S12, and the quality of the bevel is compared. To inspect. Also,
Visual inspection is performed to check whether the lens is scratched, burred or chipped due to the edging process.

[S26] The bevel-finished lens thus completed is shipped to the spectacle store 100. Next, FIG. 1 is a flowchart showing the detailed contents of step S12. The number following S represents a step number.

[S31] Polar coordinate values (Rn, θn) indicating the radius vector and its direction as three-dimensional eyeglass frame shape data.
(N = 1, 2, ..., N), center coordinates (a, b, c) of the toric surface, base radius RB, cross radius RC, rotational symmetry axial unit vector (p, q,) of the toric surface.
2 is given from the terminal computer 101 of FIG. 2 (see step S6), the orthogonal coordinate values (Xn, Yn, Zn) of the three-dimensional spectacle frame shape (n = 1, 2, ...,
N) is calculated. This will be described with reference to FIG.

FIG. 6 is a perspective view showing the relationship between each constant of the toric surface and the orthogonal coordinate value. In the figure, the two-dimensional rectangular coordinate values (Xn, Yn) among the three-dimensional rectangular frame-shaped rectangular coordinate values (Xn, Yn, Zn) are polar coordinate values (Rn, θn).
Is converted into a rectangular coordinate, and Zn is calculated as a Z-axis coordinate value at (Xn, Yn) on the given toric surface. In addition, here, the terminal computer 1
The data given from 01 is data in the state where the front direction of the spectacle frame matches the Z-axis direction.

Next, the obtained orthogonal coordinate values (Xn, Yn, Zn) of the three-dimensional eyeglass frame shape (n = 1, 2, ...)
.., N), the spectacle frame calculation perimeter FLNK, which is the length along the circumference of the restored three-dimensional spectacle frame shape, is calculated according to the following equation (1).

FLNK = Σ [{(X _i −X _{i + 1} ) ² + (Y _i −Y _{i + 1} ) ² + (Z _i −Z _{i + 1} ) ² } ^1/2 ] (i = 1 to 1 N) ... (1) However, in the above formula (1), when i = N, i + 1
Is set to 1.

From the terminal computer 101, the circumference FLN of the bevel groove, which is the measured circumference of the spectacle frame based on the three-dimensional measured values of the spectacle frame shape, is given (step S6).
), The ratio (= FLN / FLNK) is calculated, and the coefficient k is calculated. Since this coefficient k corresponds to an error amount associated with the restoration of the three-dimensional spectacle frame shape, this coefficient k is calculated as the orthogonal coordinate value (Xn, Y
The error is corrected by multiplying (n, Zn) (n = 1, 2, ..., N). This will be described with reference to FIG.

FIG. 7 shows the rectangular coordinate values (Xn,
FIG. 6 is a perspective view showing a spectacle frame shape when Yn, Zn) is corrected by a coefficient k. Cartesian coordinate values (Xn,
As a result of multiplying Yn, Zn) by a coefficient k, (kX
(n, kYn, kZn) having a coordinate value of 12
Is a new spectacle frame shape after correction. The new spectacle frame shape after this correction is given a new coordinate value (Xn, Yn, Zn)
(N = 1, 2, ..., N).

Further, the circumference length correction coefficient CF is read for each material of the spectacle frame input in advance, and the coordinate values (Xn, Yn, Zn) are corrected in the same manner as the coefficient k. This correction is mainly aimed at absorbing an error caused by expansion and contraction of the material of the spectacle frame.

The correction method described above includes a method of partially accumulating and adding errors in addition to the method of multiplying the coefficient, and the present invention may be implemented by the latter method. The above calculation processing is applied to the left and right eyeglass frames.

[S32] The positional relationship of the lens with respect to the spectacle frame is determined. This will be described with reference to FIG.
FIG. 8 is a perspective view of the left and right lenses arranged based on the eyeglass frame position. First, the datum line that is the horizontal reference axis of the spectacles is the X axis, the vertical direction of the spectacles is the Y axis, and the front direction of the spectacles is the Z axis. Two eyeglass frame shape coordinate values (X
n, Yn, Zn) (n = 1, 2, ..., N) is defined.

That is, first, the X coordinate values of the points 13 and 14 on the nose side of each spectacle frame shape are -HDBL and H, respectively.
Two eyeglass frame shape coordinate values (Xn, Y) are set so that DBL (1/2 of the frame nose width DBL sent from the terminal computer 101 is HDBL. See step S6).
n, Zn) (n = 1, 2, ..., N) is translated.

Further, as an angle formed by the front direction of the spectacles and the front direction of the spectacle frames, only the tilt TILT given from the terminal computer 101 (see step S6) is point 1
The two spectacle frame shape coordinate values that have been translated are rotationally moved about each straight line that passes through 3 and 14 and is parallel to the Y axis.

Next, the position and the direction of the spectacle lens with respect to the three-dimensional spectacle frame shape defined on the frame coordinates as described above are calculated as eye point positions 15 and 16 and the method on the front surface of the spectacle lens at this eye point position. It is specified by determining the line directions 17 and 18.

The eye point positions 15 and 16 are points on the front surface of the spectacle lens which should be located at the center of the eye of the wearer when wearing the spectacles, and as layout information, the center of the pupil from the center line of the nose of the wearer. Horizontal distance HPD to
The vertical distance EPHT from the datum line to the center of the wearer's pupil is input in advance in step S3 for each of the left and right sides. That is, left and right HPD and EPH
As T, respectively HPD _L, HPD _R and EPHT
_L and EPHT _R are input. Therefore, their HPD _L, HPD _R and EPHT _L, based on EPHT _R, X eyepoint position 15, the Y-coordinate (-HP
D _R, EPHT _R), X eyepoint position 16, Y coordinates are determined (HPD _L, EPHT _L). Further, the Z-axis coordinates of the eyepoint positions 15 and 16 and the normal direction 1 on the front surface of the spectacle lens at these eyepoint positions 1
With respect to Nos. 7 and 18, in the case of an ordered product in which the bevel position is designated in advance, the bevel position has been determined, but in other cases, the bevel position has not yet been determined and cannot be specified. Therefore, for the time being, the Z-axis coordinates of the eye point position are determined assuming that points 13 and 14 are the front surface of the lens,
In addition, by aligning the normal directions 17 and 18 on the front surface of the spectacle lens at the eye point position with the front directions 19 and 20 of the spectacle frames, respectively, the eye point position 15 and
16 and the normal directions 17, 18 on the front surface of the spectacle lens at this eye point position are determined.

The direction of the nose width DBL, which is the distance between the eyeglass frames, is defined by the unit vector BV. That is, the direction from the ear side to the nose side parallel to the X axis is the direction of the unit vector BV.

[S33] The reference point when holding the lens for performing the beveling is called the processing origin, and the direction perpendicular to the tip end of the bevel ridge is called the processing axis direction. Then, the machining origin is the coordinate origin, and the coordinates having the machining axis direction as the Z axis direction are the "machining coordinates", and step S3 is performed.
The three-dimensional spectacle frame shape data and lens position data obtained in 2 are transferred to the processing coordinates.

That is, the processing origin can be set arbitrarily, but here, for example, a straight line passing through the geometric center (frame center) of the spectacle frame and parallel to the front direction of the spectacle frame is
The point that intersects with the front surface of the lens at the position determined in step S32 is the processing origin. The processing axis direction varies depending on how the lens is held, but if the front surface of the lens is used as a reference, for example, the normal direction of the front surface of the lens at the processing origin can be determined as the processing axis direction. To the processing coordinates determined as described above, the three-dimensional spectacle frame shape data, lens position data defined on the frame coordinates in step S32,
And the nose width direction unit vector BV are coordinate-converted.

Hereinafter, the tip of the bevel ridge will be referred to as the bevel tip, and the bottom of the bevel root will be referred to as the bevel bottom. Since the three-dimensional eyeglass frame shape data is also the trajectory of the bevel tip, this is hereinafter referred to as the three-dimensional bevel tip shape, and its coordinate value is (Xbn, Ybn, Zbn) (n =
1, 2, ..., N).

[S34] First, from the two-dimensional bevel tip shape in which the trajectory of the bevel tip is projected on the XY plane in the machining coordinates, the two-dimensional bevel bottom in which the trajectory of the bevel bottom is projected on the XY plane along the Z axis of the machining coordinates. Find the shape. Figure 9
Will be described with reference to.

FIG. 9 is a plan view showing the bevel tip shape and the bevel bottom shape projected on the XY plane. That is,
The two-dimensional bevel bottom shape 22 is the two-dimensional bevel tip shape 21.
Of the two-dimensional bevel tip shape 21 is (Xbn, Ybn) (n = 1, 2, ..., N). The coordinate values of the two-dimensional bevel bottom shape 22 are (Xn, Yn) (n =
1, 2, ..., N) and the two-dimensional bevel tip shape j
If the normal vector at the th point (Xbj, Ybj) is (SVxj, SVyj), the coordinate value (Xj, Yj) of the corresponding two-dimensional bevel bottom shape 22 is (Xbj, Y).
It can be calculated by adding the normal vector (SVxj, SVyj) to bj). By calculating this from j = 1 to j = N, the coordinate value (X
n, Yn) (n = 1, 2, ..., N) is calculated.

Next, based on the lens front curve, back curve, and coordinate values (Xn, Yn) (n = 1, 2, ..., N) of the two-dimensional bevel bottom shape determined in step S11, Coordinate values of the two-dimensional bevel bottom shape (Xn, Yn)
(N = 1, 2, ..., N) j-th point (Xj, Y
The Z coordinate Zfj of the front surface of the lens in j) and the Z coordinate Zrj of the rear surface of the lens are calculated. Also, the point (Xj, Y
The edge thickness ETj of the lens in j) is calculated by the following equation (2).

ETj = | Zfj−Zrj | (2) Then, these calculations are executed from j = 1 to j = N,
Coordinate values (Xn, Yn) of the two-dimensional bevel bottom shape (n = 1,
2, ..., N) corresponding to the lens front surface three-dimensional bevel bottom shape (Xfn, Yfn, Zfn) (n = 1, 2, ...
,, N), 3D bevel bottom shape on the rear surface of the lens (Xrn, Y
rn, Zrn) (n = 1, 2, ..., N) and the lens edge thickness ETn (n = 1, 2, ..., N).

However, Xfn and Xrn correspond to corresponding Xn, and Yfn and Yrn correspond to corresponding Yn. In addition,
The three-dimensional bevel bottom shape on the front surface of the lens, the three-dimensional bevel bottom shape on the rear surface of the lens, and the edge thickness of the lens are collectively referred to as “3
We will call it the three-dimensional bevel bottom shape.

Next, in accordance with the bevel mode designated in step S3, steps S35 to S37, S41 and S4 are performed.
Proceed to either 2. [S35] A two-dimensional bevel bottom shape (Xn, Y) is obtained according to the value of the edge thickness ETj according to the convex bevel mode.
n) (n = 1, 2, ..., N) j-th coordinate value (X
The Z coordinate Zaj of the bevel apex corresponding to (j, Yj) is determined based on the following equations (3) and (4).

The distance from the front surface of the lens on the bottom of the bevel to the root of the mountain of the bevel is the forward amount FOV, and the bevel width, which is the distance between the roots of the bevel, is BW.

When ETj> BW + FOV, Zaj = Zfj−FOV−BW / 2 (3) When BW + FOV ≧ ETj ≧ BW, Zaj = Zfj− (ETj−BW / 2) (4) ETj A method of determining the Z coordinate Zaj of the bevel apex when BW is described with reference to FIG.

FIG. 10 is a cross-sectional view showing a cross section of the lens 23 taken along a plane consisting of the normal line direction at the coordinate value (Xj, Yj) and the Z-axis direction of the processing coordinates. In this cross section, Zaj is the two slopes 23 of the bevel of the lens 23.
It is determined that the lengths of a and 23b are equal.

The determination of Zaj described above is performed from j = 1 to j = N.
Up to the two-dimensional bevel bottom shape (Xn,
Yn) (n = 1, 2, ..., N) determines the Z coordinate Zan (n = 1, 2, ..., N) of the bevel apex.

[S36] According to the specified bevel mode of 1: 1 and the j-th position of the two-dimensional bevel bottom shape (Xn, Yn) (n = 1, 2, ..., N) according to the value of the edge thickness ETj. Z coordinate Z of the bevel apex corresponding to the coordinate value (Xj, Yj)
aj is determined based on the following formula (5) and the like.

When ETj ≧ BW, Zaj = Zfj−ETj / 2 (5) When ETj <BW, ETj <BW in step S35
It is decided by the same method as the decision method at the time.

The determination of Zaj above is performed from j = 1 to j = N
Up to the two-dimensional bevel bottom shape (Xn,
Yn) (n = 1, 2, ..., N) determines the Z coordinate Zan (n = 1, 2, ..., N) of the bevel apex.

[S37] According to the specified bevel mode of 1: 2, the j-th position of the two-dimensional bevel bottom shape (Xn, Yn) (n = 1, 2, ..., N) is determined according to the value of the edge thickness ETj. Z coordinate Z of the bevel apex corresponding to the coordinate value (Xj, Yj)
aj is determined based on the following equations (6), (7), (8) and the like.

When BW + 2 (mm) ≧ ETj ≧ BW, Zaj = Zfj−BW / 2 (6) 3 · BW / 2 + 3 (mm) ≧ ETj> BW + 2 (mm)
In the case of, Zaj = Zfj-BW / 2-1 (mm) (7) When ETj> 3 · BW / 2 + 3 (mm), Zaj = Zfj-ETj / 3 (8) ETj <BW If so, ETj <BW in step S35
It is decided by the same method as the decision method at the time.

The above Zaj determination is performed from j = 1 to j = N.
Up to the two-dimensional bevel bottom shape (Xn,
Yn) (n = 1, 2, ..., N) determines the Z coordinate Zan (n = 1, 2, ..., N) of the bevel apex.

[S38] In the convex bevel mode, the three-dimensional bevel tip shape (X
bn, Ybn, Zbn) (n = 1, 2, ..., N) Z-axis coordinate value Zbn and bevel vertex Z-axis coordinate value Zan (n = 1, 2, ...・, N) does not match. Therefore, the three-dimensional bevel tip shape is deformed without changing the circumferential length so that Zbn matches Zan. Further, the deformation amount MD associated with this deformation is calculated. This will be described by dividing it into steps S38-1 to S38-5.

[S38-1] Y of three-dimensional bevel tip shape
It is assumed that n when the axis coordinate Ybn has the maximum value is j1 and n when the axis coordinate has the minimum value is j2. First, set Zbj1 to Za
In order to coincide with j1, the entire three-dimensional bevel tip shape is translated in the Z-axis direction, and then passes through the points (Xbj1, Ybj1, Zbj1) on the three-dimensional bevel tip shape, and on the axis parallel to the X axis. The entire three-dimensional bevel tip shape is rotationally moved to match Zbj2 with Zaj2. Then, the deformation amount MD is set to the initial value 0.

At this time, the coordinates of (Xbn, Ybn) in the three-dimensional bevel tip shape may not completely match with (Xan, Yan), but the data of the point sequence are closely packed and the change amount is set. By considering the angle and distance to be determined and repeating the rotational movement finely, the amount of change can be substantially not affected.

[S38-2] This step and the next step S38-3 will be described with reference to FIG. FIG. 11 is a plan view of the three-dimensional bevel tip shape projected on the XY plane.

That is, the point (Xbj1, Ybj1, Zb
The neighboring point n in the clockwise direction with respect to (j1) is set to j3, and the point (Xbj3) is set so that Zbj3 matches Zaj3.
1, Ybj1, Zbj1) and the point (Xbj2, Ybj2,
Zbj2) and a three-dimensional bevel tip shape (Xbn, Ybn, Zbn) (n = 1, 2, ...
., N) part of which is rotationally deformed [Fig.
(A)]. In addition, the absolute value of the rotation angle at this time is the deformation amount M
Add to D. The part of the three-dimensional bevel tip shape refers to a portion of the three-dimensional bevel tip shape starting from the point of n = j1 to the point of n = j2 in the clockwise direction. Further, when the deformed side includes the nose side point P which is the point of the bevel tip shape closest to the nose (included in the example of FIG. 11), the nose width direction unit defined in step S32 Similarly, the vector BV is also rotated and converted into a new vector.

After the above modification process, the point of n = j3 is reset to n = j1 again [FIG. 11 (B)]. [S38-3] Next, the points (Xbj2, Ybj2, Zb
When n is adjacent to j2) when viewed counterclockwise, j3 is set so that Zbj3 coincides with Zaj3.
1, Ybj1, Zbj1) and the point (Xbj2, Ybj2,
Zbj2) and a three-dimensional bevel tip shape (Xbn, Ybn, Zbn) (n = 1, 2, ...
., N) part of which is rotationally deformed [Fig.
(B)]. In addition, the absolute value of the rotation angle at this time is the deformation amount M
Add to D. The part of the three-dimensional bevel tip shape means n = j clockwise starting from the point of n = j1.
It refers to the part of the 3D bevel tip shape up to point 2. Further, when the deformed side includes the nose side point P which is the point of the bevel tip shape closest to the nose, the nose width direction unit vector BV is also rotated again to be converted into a new vector.

After the above modification processing, the point of n = j3 is reset to n = j2 again [FIG. 11 (C)]. Step S above
38-2 and step S38-3 are sequentially repeated, and when the point of n = j3 matches the point of n = j2 or the point of n = j3 matches the point of n = j1, j1, j
2 is returned to the point defined at step S38-1 and the process proceeds to the next step S38-4.

[S38-4] This step and the next step S38-5 will be described with reference to FIG. FIG. 12 is a plan view of the three-dimensional bevel tip shape projected on the XY plane.

That is, the point (Xbj1, Ybj1, Zb
The point n (Xbj3) coincides with Zaj3 by setting n of the adjacent point as j3 when viewed counterclockwise with respect to (j1).
1, Ybj1, Zbj1) and the point (Xbj2, Ybj2,
Zbj2) and a three-dimensional bevel tip shape (Xbn, Ybn, Zbn) (n = 1, 2, ...
., N) part of which is rotationally deformed [FIG.
(A)]. In addition, the absolute value of the rotation angle at this time is the deformation amount MD added in steps S38-2 and S38-3.
Is added to. It should be noted that a part of the above-mentioned three-dimensional bevel tip shape means n = j counterclockwise starting from the point of n = j1.
It refers to the part of the 3D bevel tip shape up to point 2. Further, when the deformed side includes the nose side point P which is the point of the bevel tip shape closest to the nose (not included in the example of FIG. 12), the nose width direction unit defined in step S32 Similarly, the vector BV is also rotated and converted into a new vector.

After the above modification processing, the point of n = j3 is reset to n = j1 again (FIG. 12 (B)). [S38-5] Next, the points (Xbj2, Ybj2, Zb
The adjacent point n in the clockwise direction with respect to j2) is set to be j3, and the point (Xbj3) is set so that Zbj3 matches Zaj3.
1, Ybj1, Zbj1) and the point (Xbj2, Ybj2,
Zbj2) and a three-dimensional bevel tip shape (Xbn, Ybn, Zbn) (n = 1, 2, ...
., N) part of which is rotationally deformed [FIG.
(B)]. In addition, the absolute value of the rotation angle at this time is the deformation amount M
Add to D. It should be noted that the above-mentioned part of the three-dimensional bevel tip shape means n = j1 in a counterclockwise direction starting from a point of n = j1.
It indicates the portion of the three-dimensional bevel tip shape up to the point of j2. Further, when the deformed side includes the nose side point P which is the point of the bevel tip shape closest to the nose, the nose width direction unit vector BV is also rotated again to be converted into a new vector.

After the above modification process, the point of n = j3 is reset to n = j2 again (FIG. 12 (C)). Step S above
38-4 and step S38-5 are sequentially repeated, and when the point of n = j3 matches the point of n = j2 or the point of n = j3 matches the point of n = j1, the above step S38. -4 and step S38-5 are completed.

Now, the three-dimensional bevel tip shape (Xbn, Ybn, Zbn) representing the actual bevel shape (n = 1,
2, ..., N) Z-axis coordinate value Zbn is the bevel vertex Z-axis coordinate value Zan (n = 1, 1) that represents the target bevel shape.
2, ..., N) can be transformed without changing the circumference.

On the other hand, it is necessary to slightly correct the deformation amount MD indicating the degree of deformation. This will be described with reference to FIG. FIG. 13 shows the three-dimensional bevel tip shape as points (Xbj1, Ybj1, Zbj1) and points (Xbj2, Y
bj2, Zbj2) is a cross-sectional view taken along a plane perpendicular to a straight line passing through bj2 and Zbj2). In the figure, the first step S38-
When the absolute value of the rotation angle when 2 is executed is MD1 and the absolute value of the rotation angle when step S38-4 is executed for the first time is MD2 (for example, MD1> MD2 = MD0), When a part of the three-dimensional beveled tip shape due to execution has the same rotation direction (FIG. 13 corresponds to this case), the deformation amount MD is increased by twice as much as MD0. The final deformation amount MD is obtained by subtracting minutes.

If step S45, which will be described later, has already been performed and step S34 is performed again, the MD amount obtained by adding MD0 to the deformation amount MD obtained here is newly added to MD.
far.

[S39] In the 1: 1 bevel mode,
3D bevel tip shape (Xb
Z of n, Ybn, Zbn) (n = 1, 2, ..., N)
The axis coordinate value Zbn and the bevel vertex Z-axis coordinate value Zan (n = 1, 2, ..., N) representing the target bevel shape do not match. Therefore, the three-dimensional bevel tip shape is deformed without changing the circumferential length so that Zbn matches Zan. Further, the deformation amount MD associated with this deformation is calculated. These processes are the same as step S38. Therefore, the description is omitted.

[S40] In the case of 1: 2 bevel mode,
3D bevel tip shape (Xb
Z of n, Ybn, Zbn) (n = 1, 2, ..., N)
The axis coordinate value Zbn and the bevel vertex Z-axis coordinate value Zan (n = 1, 2, ..., N) representing the target bevel shape do not match. Therefore, the three-dimensional bevel tip shape is deformed without changing the circumferential length so that Zbn matches Zan. Further, the deformation amount MD associated with this deformation is calculated. These processes are the same as step S38. Therefore, the description is omitted.

[S41] In the case of the bevel mode following the frame, the description of this step will be given with reference to FIG. FIG. 14 is a perspective view of the lens in which the bevel apex position is shown.

First, the Z-axis coordinate value Zan (n = 1, 1) of the bevel apex is subjected to the same processing as that in step S35 for convex contouring.
2, ..., N). Next, the three-dimensional bevel tip shape (Xbn, Ybn, Zbn) (n = 1, 2, ...
., N) are translated in the Z-axis direction of the machining coordinates, and
Rotate and move by the axis that passes through the machining origin and is perpendicular to the Z axis,
Z-axis coordinate Zbn (n = 1, 2,
..., N) is Zbn ≦ Zan (n = 1, 2, ...
, N), and M given by the following equation (9)
Make the value of the minimum. Then, the Z-axis coordinate Zbn (n = 1,
2, ..., N).

M = Σ (| Zfi−Zbi |) (i = 1 to N) (9) In accordance with this rotational movement, the nose width direction unit vector BV is similarly rotated to obtain a new vector.

Next, the Z-axis coordinate Zbn (n = 1, 2, ..., Of the new three-dimensional bevel tip shape obtained by movement is obtained.
For N), Zbn = Zan, or Zbn ≧ Zrn
It is checked whether + BW / 2 holds for all of n = 1, 2, ..., N.

As a result, if not satisfied, an error code indicating that a frame-shaped bevel cannot be set is output and the operation is terminated. On the other hand, if satisfied, the newly obtained data is the final three-dimensional bevel tip shape (Xbn, Ybn, Zbn) when the frame tracing is designated.
(N = 1, 2, ..., N) and the nose width direction unit vector BV.

Since the spectacle frame is not deformed when the frame is followed, the deformation amount MD is 0 in the frame-shaped bevel mode. [S42] It is ideal that the eyeglasses have a convex appearance,
Convex contours often require considerable deformation of the spectacle frame. Therefore, in the automatic bevel, the bevel is made to approach a position as convex as possible within a range in which the spectacle frame can be deformed.

The contents of this step will be described with reference to FIG. FIG. 15 is a perspective view of the lens in which the bevel apex position is shown. First, the Z-axis coordinate value of the bevel apex is set to Ztn (n
= 1, 2, ..., N).

Next, the three-dimensional bevel tip shape (Xbn,
Ybn, Zbn) (n = 1, 2, ..., N) is translated in the Z-axis direction of the machining coordinates, and Z is passed through the machining origin.
By rotating and moving along the axis perpendicular to the axis, the Z-axis coordinate Zbn (n = 1, 2, ..., N) of the three-dimensional bevel tip shape becomes
Zbn ≦ Ztn (n = 1, 2, ..., N) is satisfied,
In addition, the value of M given by the following equation (10) is set to the minimum value. Then, the coordinate values of the new three-dimensional bevel tip shape after movement are set to (Xbfn, Ybfn, Zbfn)
(N = 1, 2, ..., N).

M = Σ (| Zfi−Zbi |) (i = 1 to N) (10) Further, the bevel Z-axis coordinate value Ztn is used for the Z-axis coordinate value Zbfn of the three-dimensional bevel tip shape. Step S38
The same three-dimensional bevel tip shape (Xbtn, Ybtn, Zbtn) (n = 1, 1) obtained when the convex bevel mode is specified is performed.
2, ..., N), the nose width direction unit vector BVt, and the deformation amount MDt.

This deformation amount MDt is compared with the deformation limit amount MDlim set in advance for each material of the spectacle frame. As a result, if the deformation amount MDt does not exceed the limit amount MDlim, the three-dimensional bevel tip shape (Xbtn,
Ybtn, Zbtn) (n = 1, 2, ..., N), the nose width direction unit vector BVt, and the deformation amount MDt are the three-dimensional bevel tip shape (Xbn, Ybn, when the bevel mode of the auto bevel is designated. Zbn) (n = 1,
2, ..., N), the nose width direction unit vector BV, and the deformation amount MD, and this step S42 is ended.

On the other hand, when the deformation amount MDt exceeds the limit amount MDlim, the Z coordinate value Zan (n = 1, 1) of the bevel apex when the bevel mode of the automatic bevel is designated.
2, ..., N), the j-th Z coordinate value Zaj is determined based on the following equations (11), (12).

ETj ≧ BW and LMj ≧ Zbfj +
When (Zbtj−Zbfj) · MDlim / MDt, Zaj = LMj (11) ETj ≧ BW, and LMj <Zbfj + (Zbtj−
Zbfj) · MDlim / MDt, Zaj = Zbfj + (Zbtj−Zbfj) · MDlim / MDt (12) Here, LMj is the j-th three-dimensional bevel bottom shape, and Zaj is the lens rear surface. This is a limit value that can be approached, and is given by the following equation (13), for example.

LMj = Zfj−ETj / 2 (13) FIG. 16 shows the position of the variable used in the above formulas (11), (12) and (13), and the coordinate value (Xj, Y
It is sectional drawing which shows the cross section of the lens 24 cut | disconnected by the plane which consists of the normal line direction and the Z-axis direction of a process coordinate in j).

When ETj <BW, it is determined by the same method as the method of determining Zaj when ETj <BW shown in step S35. By executing the above determination of Zaj from j = 1 to j = N, the Z coordinate value Zan of the bevel vertex when the bevel mode of the automatic bevel is designated.
(N = 1, 2, ..., N) is determined.

The Z coordinate value Za of the determined bevel apex
Using n (n = 1, 2, ..., N), step S3
The same process as the process of 8 is executed, and the three-dimensional bevel tip shape (Xb
n, Ybn, Zbn) (n = 1, 2, ..., N), the nose width direction unit vector BV, and the deformation amount MD are obtained.

[S43] The deformation amount MD calculated based on each designated bevel mode is compared with the limit amount MDlim. As a result, if the deformation amount MD exceeds the limit amount MDlim, an error code indicating that the deformation limit is exceeded is output, and the processing of this program ends. If not exceeded, the process proceeds to step S44.

[S44] When the transformation of the three-dimensional bevel tip shape is finished, the transformed position of the eyepoint position determined in step S32 is calculated, and the error from the predesignated eyepoint position is corrected. This will be described with reference to FIG.

FIG. 17 is a perspective view of the one-eye three-dimensional bevel tip shape showing the eye point position and the like. In the figure, if the vector starting from the deformed position 25 of the eye point position determined in step S32 and ending at the nose side point P of the three-dimensional bevel tip shape is EPBV, the deformation of the three-dimensional bevel tip shape is performed. PD (horizontal distance from centerline of nose of wearer to center of pupil) HPDa
Is calculated from the nose width direction unit vector BV and HDBL, which is half the width of the nose of the glasses, by the following equation (14).

HPDa = EPBV * BV + HDBL (14) In addition, “*” means an inner product of vectors. The same applies hereinafter. Therefore, HPDa and the designated one eye P
The error amount δDb from the HPD that is D is calculated by the following equation (15).

ΔDb = EPBV * BV + HDBL−HPD (15) Therefore, if the component of the nose width direction unit vector BV is (X _BV , Y _BV , Z _BV ), the three-dimensional bevel tip shape (Xbn, Ybn) is obtained. , Zbn) after the error correction of the three-dimensional bevel tip shape (Xcn, Ycn, Zcn) (n = 1,
2, ..., N) are expressed by the following equations (16), (17), (18).
Is calculated by

Xcn = Xbn−X _BV · δDb (16) Ycn = Ybn−Y _BV · δDb (17) Zcn = Zbn−Z _BV · δDb (18) Three-dimensional after correction Bevel tip shape (Xcn, Ycn, Zc
n) (n = 1, 2, ..., N) is changed to (Xbn, Y
bn, Zbn) (n = 1, 2, ..., N).

The eye point height (vertical distance from the datum line to the center of the eye of the wearer) EPHT at the time when the deformation of the tip shape of the three-dimensional bevel is completed.
It is also possible to obtain a and correct the error from the specified eye point height EPHT. This will be described with reference to FIG.

FIG. 18 is a perspective view of the shape of the three-dimensional bevel tip of one eye showing the eye point position and the like. First, in step S32, the unit vector CV in the Y-axis direction of the frame coordinates is calculated in advance, and in the steps after step S32, the unit vector CV in the Y-axis direction is converted by the same method as the conversion of the nose width direction unit vector BV. Convert by.

When the deformation of the three-dimensional bevel tip shape is completed, (Xbn, Ybn, Zbn) (n = 1, 2, ...
.., N), the inner product of the coordinate value of each point and the unit vector CV of the frame coordinates in the Y-axis direction is obtained, and the point at which the inner product is maximum is (Xbp, Ybp, Zbp), and the inner product is the minimum value. Is defined as (Xbq, Ybq, Zbq), and the midpoint (Xbm, Ybm, Zbm) between these two points is given by the following equation (19),
It is calculated by (20) and (21).

Xbm = (Xbp + Xbq) / 2 (19) Ybm = (Ybp + Ybq) / 2 (20) Zbm = (Zbp + Zbq) / 2 (21) This midpoint (Xbm, Ybm, Zbm) can be regarded as a point on the datum line of the three-dimensional beveled tip shape after deformation, and a vector having this point as the starting point and the eye point position 26 on the front surface of the lens as the ending point is defined as EPCV. For example, the eyepoint height EPHTa at the time when the deformation is completed is calculated by the following equation (22).

EPHTa = EPCV * CV (22) Therefore, the error amount δDc between EPHTa and EPHT is calculated by the following equation (23).

ΔDc = EPCV * CV-EPHT (23) Therefore, the unit vector C in the Y-axis direction of the frame coordinates.
The component of V is (X_CV, Y _CV, Z_CV) If you say
Error correction of tip shape (Xbn, Ybn, Zbn)
Later 3D bevel tip shape (Xdn, Ydn, Zdn)
(N = 1, 2, ..., N) is expressed by the following equations (24), (2)
5) and (26).

Xdn = Xbn + X _CV · δDc (24) Ydn = Ybn + Y _CV · δDc (25) Zdn = Zbn + Z _CV · δDc (26) This corrected three-dimensional bevel tip shape (Xdn) , Ydn,
Zdn) (n = 1, 2, ..., N) is changed to (Xb
n, Ybn, Zbn) (n = 1, 2, ..., N).

[S45] It is determined whether or not the absolute values of the error amounts δDb and δDc calculated in step S44 are larger than 0.1 mm. If it is larger than 0.1 mm, the deformation amount MD at this time is saved as MD0, and the step S3 is performed.
4 to step S44, the error amounts δDb and δD
It is repeatedly executed until the absolute value of c becomes 0.1 mm or less, and the final three-dimensional bevel tip shape (Xbn, Ybn,
Zbn) (n = 1, 2, ..., N) is calculated. When the absolute values of the error amounts δDb and δDc become 0.1 mm or less, the process proceeds to step S46.

[S46] The final three-dimensional bevel tip shape (Xbn, Ybn, Zbn) thus obtained (n =
1, 2, ..., N) and the same process as step S34 is performed to obtain the final lens front surface three-dimensional bevel bottom shape (Xfj, Yfj, Zfn) (n = 1, 2,・
.., N), 3D bevel bottom shape on the rear surface of the lens (Xrj,
Yrj, Zrn) (n = 1, 2, ..., N) and the lens edge thickness ETn (n = 1, 2, ..., N) are obtained.

However, when ETj <BW at the j-th point of the bevel bottom shape, the j-th coordinate of the two-dimensional bevel bottom shape (Xn, Yn) (n = 1, 2, ..., N). In a lens cross section cut through a plane that passes through (Xj, Yj) and is parallel to the normal direction at (Xj, Yj) and the Z-axis direction of the processing coordinates, the bevel on the lens front surface side of the bevel determined by the three-dimensional bevel tip shape ( (Corresponding to 23b in FIG. 10)
However, the point where it intersects with the front surface of the lens is changed (Xfj, Yfj,
Zfj), and the slope of the rear surface of the bevel lens (see FIG. 10).
23a) of the above) intersects with the rear surface of the lens again (Xrj, Yrj, Zrj).

Next, regarding step S22 in FIG.
It will be described again in detail. First, the same calculation as the beveling design calculation of step S12 of FIG. 4 is performed. However, in the actual processing, when the lens is blocked (held), an error may occur between the calculated lens position and the actual lens position depending on the type of the lens. When S33 ends, this is corrected.

That is, in order to grasp the position of the lens when it is actually mounted on the lens grinding device 241, the measured position data of at least three points on the front surface or the rear surface of the lens, which are measured in advance in step S21, Xsm, Y
sm, Zsm) (m = 1, 2, ..., M), and the calculated position of the front or rear surface of the lens corresponding to the measurement position data is (Xsm, Ysm, Ztm) (m = 1, 2,
..., M). Here, the total amount DZ of the error in the Z-axis direction is calculated based on the following equation (27).

DZ = Σ (| Zsi−Zti |) (i = 1 to M) (27) Then, the three-dimensional eyeglass frame shape data, lens position data, and the three-dimensional spectacle frame shape data defined on the processing coordinates by calculation. The nose width direction vector BV is rotated and Z with the straight line passing through the processing origin as the axis.
The axial translation causes the DZ to be minimized.

In this way, after the error between the calculated lens position and the actual lens position is corrected to the minimum, steps S34 and subsequent steps in FIG. 1 are executed,
Final three-dimensional bevel tip shape (Xbn, Ybn, Zb
n) (n = 1, 2, ..., N) is calculated.

Next, the obtained final three-dimensional bevel tip shape (Xbn, Ybn, Zbn) (n = 1, 2, ...
, N), and a three-dimensional machining locus (X) on machining coordinates when machining with a grindstone 29 having a radius TR (see FIG. 19 described later).
gn, Ygn, Zgn) (n = 1, 2, ..., N) is calculated. This will be described with reference to FIG.

FIG. 19 is a plan view showing the beveled tip shape and the processing locus projected on the XY plane. First, 3
Dimensional bevel tip shape (Xbn, Ybn, Zbn) (n =
1, 2, ..., N) is projected onto the XY plane of the machining coordinates from the two-dimensional bevel tip shape 27 to the two-dimensional machining trajectory 28.
Ask for.

That is, the coordinate values of the two-dimensional bevel tip shape 27 are (Xbn, Ybn) (n = 1, 2, ...,
N) The coordinate value of the two-dimensional machining trajectory 28 is set to (Xgn, Yg
n) (n = 1, 2, ..., N), the two-dimensional machining trajectory 28 is a shape obtained by deforming the two-dimensional bevel tip shape 27 by the radius TR of the grindstone 29 in the normal direction of the shape. From the j-th point (Xbj,
The normal vector in Ybj) is (SVxj, SVy
j), the coordinate value (Xgj, Ygj) of the corresponding two-dimensional machining path 28 becomes (SVx, Ybj).
j, SVyj). By calculating this from j = 1 to j = N, the two-dimensional machining locus (Xgn, Ygn) (n = 1, 2, ..., N) can be obtained.

Then, the three-dimensional machining locus (Xgn, Yg
Z coordinate value Z of (n, Zgn) (n = 1, 2, ..., N)
gn is a three-dimensional bevel tip shape (Xbn, Ybn, Zb
n) (n = 1, 2, ..., N) is equal to the Z coordinate value Zbn, so Zgn = Zbn (n = 1, 2, ..., N)
Can be asked as

If the control coordinate system of the lens grinding device 241 is a cylindrical coordinate system, the obtained three-dimensional processing locus (Xgn, Ygn, Zgn) (n = 1, 2, ...,
N) is the three-dimensional machining trajectory (Rgn, θg in the cylindrical coordinate system
The coordinates are converted into (n, Zgn) (n = 1, 2, ..., N) and applied to the lens grinding device 241.

[0157]

As described above, according to the present invention, the deformation amount of the eyeglass frame shape when the eyeglass frame shape is deformed so as to match the set bevel is calculated, and the calculated deformation amount is set to the predetermined value. By comparing with the limit value, it is determined whether or not the shape of the spectacle frame can be deformed and reflected in the bevel setting. As a result, the designated position of the bevel is changed, and the bevel setting can be performed so that the bevel-processed lens can be reliably fitted to the spectacle frame.

Further, a predetermined limit value is set according to the material of the spectacle frame. Therefore, the tolerance of deformation of the spectacle frame generally differs depending on the material of the spectacle frame, but it is possible to appropriately cope with the difference in the tolerance, and it is possible to set the bevel so that the beveled lens can be securely fitted to various spectacle frames. Becomes

[Brief description of drawings]

FIG. 1 is a flowchart showing detailed contents of step S12 of FIG. 4 according to the present invention.

FIG. 2 is an overall configuration diagram of a spectacle lens supply system in which the spectacle lens bevel setting method of the present invention is implemented.

FIG. 3 is a flowchart showing a flow of first input processing in an eyeglass store.

FIG. 4 is a flow chart showing a flow of processing in a factory and steps of confirmation and error display performed at an eyeglass store by transfer from the factory.

FIG. 5 is a flowchart showing an actual process such as polishing of a lens back surface, lens edging, and beveling performed in a factory.

FIG. 6 is a perspective view showing a relationship between each constant of a toric surface and a rectangular coordinate value.

FIG. 7: Cartesian coordinate values (Xn, Yn, Zn) of eyeglass frame shape
It is a perspective view which shows the spectacle frame shape when it correct | amended by the coefficient k.

FIG. 8 is a perspective view of the left and right lenses arranged based on the position of the spectacle frame.

FIG. 9 is a plan view showing a bevel tip shape and a bevel bottom shape projected on an XY plane.

FIG. 10 is a cross-sectional view showing a cross section of a lens taken along a plane formed by a normal line direction at a coordinate value (Xj, Yj) and a Z-axis direction of processing coordinates.

FIG. 11 is a plan view of a three-dimensional bevel tip shape projected on an XY plane.

FIG. 12 is a plan view of a three-dimensional bevel tip shape projected on an XY plane.

FIG. 13 shows a three-dimensional bevel tip shape with a point (Xbj1, Y
bj1, Zbj1) and the point (Xbj2, Ybj2, Zbj
2) A sectional view taken along a plane perpendicular to a straight line passing through and 2).

FIG. 14 is a perspective view of a lens in which a bevel apex position is shown.

FIG. 15 is a perspective view of a lens in which a bevel apex position is shown.

FIG. 16 is a cross-sectional view showing a cross section of a lens taken along a plane formed by a normal direction at coordinate values (Xj, Yj) and a Z-axis direction of processing coordinates.

FIG. 17 is a perspective view of a one-dimensional three-dimensional bevel tip shape showing an eye point position and the like.

FIG. 18 is a perspective view of a one-dimensional three-dimensional bevel tip shape showing an eye point position and the like.

FIG. 19 is a plan view showing a beveled tip shape and a machining trajectory projected on an XY plane.

[Explanation of symbols]

 100 Eyeglass Store 101 Terminal Computer 102 Frame Shape Measuring Machine 200 Factory 201 Mainframe 202 LAN 210 Terminal Computer 211 Rough Rubber (Curve Generator) 212 Sanding Polisher 220 Terminal Computer 221 Lens Meter 222 Thickness Meter 230 Terminal Computer 231 Marker 232 Image processor 240 Terminal computer 241 Lens grinding device 242 Chuck interlock 250 Terminal computer 251 Shape measuring instrument 300 Public communication line

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 5, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

In the spectacle store 100, an online terminal computer 101 and a frame shape measuring instrument 102 are installed. The terminal computer 101 includes a keyboard input device and a CRT screen display device, and is connected to the public communication line 300. The spectacle frame actual measurement value is input to the terminal computer 101 from the frame shape measuring device 102 to perform arithmetic processing, and the spectacle lens information, prescription value and the like are input from the keyboard input device.
The output data of the terminal computer 101 is sent to the mainframe 2 of the factory 200 via the public communication line 300.
01 transferred online. In addition, terminal computer
A relay station is installed between the main unit 101 and the mainframe 201.
You may choose to turn it off. In addition, the terminal computer 101
The installation location is limited to the eyeglass store 100
There is no.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0024

[Correction method] Change

[Correction content]

[S2] The color of the lens is designated. [S3] A lens prescription value, a lens processing specification value, spectacle frame information, layout information, bevel mode, bevel position, and bevel shape are input. Layout information is
The eyepoint position, which is the position of the pupil on the spectacle frame , is designated.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0027

[Correction method] Change

[Correction content]

The bevel shape is selected and input from "standard bevel", "comb bevel (bevel for combination frame)", "grooving" and "planar beveling". "Combined bevel" is designated when a frame member is provided with a decorative member and the lens hits the decorative member. "Grooving",
"Flat" is also specified here.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction content]

[S8] The spectacle frame shape information stored for the corresponding spectacle frame is read from the internal storage medium according to the measurement number. Through the above steps S1 to S8, the spectacle lens information, the eye
Of mirror frame information, prescription value, layout information, processing instruction information
Processing condition data, which is at least one of the above. [S9] Designate "inquiry" or "order".

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction content]

[S11] Mainframe 2 of factory 200
01 includes a spectacle lens ordering system program, a spectacle lens processing design program, and a bevel processing design program. When data such as lens information, prescription value, frame information , layout information, and bevel information is sent via the public communication line 300, the eyeglass lens processing design program is started via the eyeglass lens ordering system program, and lens processing design calculation is performed. Is done. That is, ya
A desired lens shape including the gen shape is calculated.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0046

[Correction method] Change

[Correction content]

Hold lens for beveling
In this case, the machining origin that becomes the reference and the machining axis that is the rotation axis
Therefore, the coordinates of the data so far are converted into the processing coordinates. So
And three-dimensional bevel tip shape(Including bevel locus)
Is determined according to the designated bevel mode. That
When changing the 3D bevel tip shape, do not change the bevel circumference.
The amount of deformation expected is
calculate. When the bevel mode is frame
When bending is not possible, it cannot be deformed.
If the bee does not stand, an error code to that effect
Is output.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0047

[Correction method] Change

[Correction content]

The calculated amount of deformation is compared with the limit amount of deformation provided for each material of the spectacle frame, and if it exceeds the limit amount, an error code to that effect is output. In addition,
By deforming the three-dimensional bevel tip shape, the eyepoint position shifts, so the error is corrected. It also corrects the restoration error. These processes are optional
It can be done alternatively.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0053

[Correction method] Change

[Correction content]

[S16] The message “Order received” is displayed on the screen display device of the terminal computer 101 of the spectacle store 100. As a result, it can be confirmed that the lens before edging or after beveling that can be reliably framed in the frame can be ordered.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0106

[Correction method] Change

[Correction content]

After the above modification process, the point of n = j3 is reset to n = j1 again [FIG. 11 (B)]. Smell of Figure 11
The solid shape of the beveled tip shape after the deformation process and before the deformation process.
It is shown by a broken line (the same applies to FIG. 12). The above rotation
The corner will be described with reference to FIG. In the figure, point j3 is glasses
The bevel position along the frame is shown, and the point p1 is the set bevel.
Shows the gen position (target position), and the point p2 is the final baldness.
The rotation angle corresponds to the angle md when indicating the position. [S38-3] Next, the points (Xbj2, Ybj2, Zb
When n is adjacent to j2) when viewed counterclockwise, j3 is set so that Zbj3 coincides with Zaj3.
1, Ybj1, Zbj1) and the point (Xbj2, Ybj2,
Zbj2) and a three-dimensional bevel tip shape (Xbn, Ybn, Zbn) (n = 1, 2, ...
., N) part of which is rotationally deformed [Fig.
(B)]. In addition, the absolute value of the rotation angle at this time is the deformation amount M
Add to D. The part of the three-dimensional bevel tip shape means n = j clockwise starting from the point of n = j1.
It refers to the part of the 3D bevel tip shape up to point 2. Further, when the deformed side includes the nose side point P which is the point of the bevel tip shape closest to the nose, the nose width direction unit vector BV is also rotated again to be converted into a new vector.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Name of item to be corrected] 0112

[Correction method] Change

[Correction content]

Now, the three-dimensional bevel tip shape (Xbn, Ybn, Zbn) representing the actual bevel shape (n = 1,
2, ..., N) Z-axis coordinate value Zbn is the bevel vertex Z-axis coordinate value Zan (n = 1, 1) that represents the target bevel shape.
2, ..., N) can be transformed without changing the circumference. In addition, instead of the above method,
Use another method to perform the deformation without changing the circumference.
May be.

[Procedure Amendment 11]

[Document name to be amended] Statement

[Name of item to be corrected] 0156

[Correction method] Change

[Correction content]

If the control coordinate system of the lens grinding device 241 is a cylindrical coordinate system, the obtained three-dimensional processing locus (Xgn, Ygn, Zgn) (n = 1, 2, ...,
N) is the three-dimensional machining trajectory (Rgn, θg in the cylindrical coordinate system
The coordinates are converted into (n, Zgn) (n = 1, 2, ..., N) and applied to the lens grinding device 241. The present invention is eyeglasses
Even when forming a groove bevel on the edge of a spectacle lens without a frame
It is applicable.

[Procedure Amendment 12]

[Document name to be amended] Statement

[Name of item to be corrected] Fig. 20

[Correction method] Added

[Correction content]

FIG. 20 is a perspective view illustrating a rotation angle.

[Procedure Amendment 13]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 11

[Correction method] Change

[Correction content]

FIG. 11

[Procedure Amendment 14]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 12

[Correction method] Change

[Correction content]

[Fig. 12]

[Procedure Amendment 15]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 20

[Correction method] Added

[Correction content]

FIG. 20

Claims (2)

[Claims] 1. A spectacle lens bevel setting method for setting a bevel on an edge of an spectacle lens fitted into a deformable spectacle frame, wherein a bevel is set on the edge of the spectacle lens based on a designated bevel mode, and the setting is performed. Calculate the deformation amount of the spectacle frame shape when deforming the spectacle frame shape so as to match the bevel, comparing the calculated deformation amount with a preset predetermined limit value, the comparison of A spectacle lens bevel setting method, which determines whether or not the spectacle frame shape can be deformed based on a result and reflects the determination in the bevel setting. 2. The spectacle lens bevel setting method according to claim 1, wherein the predetermined limit value is set according to a material of the spectacle frame.