JP2994870B2 - Eyeglass lens bevel setting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art A processing side of a spectacle lens calculates a desired lens shape including a bevel shape based on information on a spectacle lens and a spectacle frame sent from a spectacle lens ordering side. Information on whether or not lens processing is possible, and further, the expected finish shape of the spectacle lens including the beveled shape, is returned to the ordering side, and the ordering side sends the transmitted availability information or finish Display the expected shape on the screen and check whether lens processing including beveling is possible, or check the expected finish shape, and based on this confirmation, determine the eyeglass lens with the optimal bevel A system for supplying spectacle lenses, which is designed to place an order, has been proposed by the present applicant (Japanese Patent Application No. 4-165912).

[0003] The realization of this system is based on the premise 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 properly fitted to the beveled lens.

On the other hand, in the conventional beveling design, the spectacle frame is not deformed, but the bevel is simply set on the edge of the lens according to the three-dimensional spectacle frame shape, or the spectacle frame is processed with the processing axis ( Assuming that it deforms in the (Z-axis) direction,
A bevel has been set on the edge of the lens in accordance with the lens surface shape (for example, see Japanese Patent Application Laid-Open No. 3-13571).
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, as in the latter method, the bevel position is set according to the lens surface shape, and the spectacle frame is set. The beveled lens is fitted into the spectacle frame while deforming the lens in the processing axis (Z-axis) direction.

[0005]

However, in the conventional beveling design, in the latter method, in the case of the bevel setting on the premise of deformation of the spectacle frame, there is a limit to the deformation of the spectacle frame. Without considering such limitations, the beveling design was performed. Therefore, when actually fitting the beveled lens to the spectacle frame, a situation may occur in which the lens cannot be fitted to the spectacle frame because the spectacle frame cannot be completely deformed.

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 method for setting a bevel of a spectacle lens that can surely fit a beveled lens to a spectacle frame.

[0007]

According to the present invention, in order to solve the above-mentioned problems, a bevel is set on the edge of a spectacle lens based on a specified bevel mode, and a spectacle frame shape is set so as to match the set bevel. Calculate the deformation amount of the spectacle frame shape when deformed, compare the calculated deformation amount with a predetermined limit value set in advance, determine the possibility of deformation of the spectacle frame shape based on the comparison result, A spectacle lens bevel setting method characterized in that the method is reflected in a bevel setting is provided.

[0008] The predetermined limit value is set according to the material of the spectacle frame.

[0009]

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

Next, a 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. I do.

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

As a result, the designated position of the bevel is changed, and as a result, the bevel setting for surely fitting the beveled lens to the spectacle frame is performed. Further, a predetermined limit value is set according to the material of the eyeglass frame. Generally, the tolerance of the deformation of the spectacle frame differs depending on the material of the spectacle frame. By this, it is possible to appropriately cope with the difference in the tolerance, and to set a bevel setting that allows the beveled lens to be securely fitted to various spectacle frames. It becomes possible.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 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 performed. An eyeglass store 100 on the ordering side and a factory 200 of a lens maker on the lens processing side are connected by a public communication line 300. Although only one spectacle store is shown in the figure, a plurality of spectacle stores are actually connected to the factory 200.

An eyeglass store 100 is provided with an online terminal computer 101 and a frame shape measuring device 102. The terminal computer 101 includes a keyboard input device and a CRT screen display device, and is connected to a public communication line 300. The eyeglass frame actual measurement value is input from the frame shape measuring device 102 to the terminal computer 101 to perform arithmetic processing, and eyeglass lens information, a prescription value, and the like are input from the keyboard input device.
The output data of the terminal computer 101 is transmitted to the mainframe 2 of the factory 200 via the public communication line 300.
01 is transferred online. In addition, terminal computer
A relay station between the
You may make it go. Also, the terminal computer 101
Is limited to the spectacle store 100
There is no.

The main frame 201 includes a spectacle lens processing design program, a bevel processing design program, and the like. The main frame 201 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 to display the result on the screen display device. The calculation results are also transmitted to the terminal computers 210, 220, 230, 240, and 250 of the factory 200.
Via the LAN 202.

The terminal computer 210 is connected to a rough rubbing machine (curve generator) 211 and a sanding polisher 212. The terminal computer 210 operates according to the calculation result sent from the main frame 201.
And the sanding grinder 212 are controlled to perform the curved surface finishing of the rear surface (rear surface) of the lens whose front surface has been processed in advance.

A lens meter 221 and a thickness gauge 222 are connected to the terminal computer 220. The terminal computer 220 sends the measured values obtained by the lens meter 221 and the thickness gauge 222 and the measured values obtained from the main frame 201. By comparing the calculated result with the calculated result, an acceptance inspection of the lens whose lens back surface (back surface) has been finished is performed, and a mark (three-point mark) indicating the optical center is given to the passed 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) at the time of edging and beveling of 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 the block is fixed to the lens according to the blocking position mark.

The terminal computer 240 is connected with an NC-controlled lens grinding device 241 comprising a machining center and a chuck interlock 242. The terminal computer 240 performs edge trimming of the lens according to the calculation result sent from the main frame 201. And beveling is performed.

The terminal computer 250 is connected to a bevel vertex shape measuring instrument 251.
In the case of “0”, the bevel processing of the beveled lens measured by the shape measuring device 251 is compared with the calculation result sent from the main frame 201 to determine whether or not the processing is successful.

The flow of processing until a 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, the flow of this processing includes
There are two types, “inquiry” and “order”. In “inquiry”, the spectacles shop 100 sends the factory 2
00, and “order” means that the spectacle store 100 requests the factory 200 to send a lens before edging or a beveled lens.

FIG. 3 is a flowchart showing the flow of the first input processing in the eyeglass store 100. In the figure, the numbers following S represent step numbers. [S1] The lens order inquiry processing program of the terminal computer 101 of the eyeglass store 100 is started, and the order entry screen is displayed on the screen display device. Optician 100
The operator designates the type of lens to be ordered or inquired by using the keyboard input device while viewing the order entry screen.

That is, whether the lens to be designated, ordered or inquired is a beveled lens or a lens which is not subjected to edging and beveling, and the thickness of the lens Is specified so as to be a necessary minimum value, a chamfer for making the edge of the minus lens inconspicuous, and a polishing specification for the portion are performed.

[S2] The color of the lens is specified. [S3] The lens prescription value, lens processing designation value, eyeglass frame information, layout information, bevel mode, bevel position, and bevel shape are input. Layout information
The eye point position which is the pupil position on the spectacle frame is designated.

Lens processing designation values include lens thickness,
Specified values of edge thickness, prism, eccentricity, outer diameter, and lens surface curve (base curve) can be input. The bevel mode includes “1: 1”, “1: 2”, “convex”, “frame”, and “auto bevel” modes depending on where the bevel is set on the lens edge.
Select from them and enter. Here, for example, “convex” 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", or "auto bevel". Is specified in units of 0.5 mm. Even if the frame frame is thick and the distance from the front of the frame to the bevel groove is long,
By inputting the bevel position, the top of the bevel 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", "combination bevel (combination frame bevel)", "grooving" and "flat sliding". The “combination bevel” is specified when a decorative member is provided on the frame and the lens hits the decorative member. "Grooving",
"Smoothing" is also specified here.

[S4] Here, it is determined whether or not the measurement of the eyeglass frame shape of the target frame by the frame shape measuring device 102 in FIG. 2 has already been completed. 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 user inputs the measurement number assigned to the spectacle frame whose shape is to be measured. 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 in step S12 as a parameter for correcting the peripheral length of the bevel apex in accordance with the material so that the lens fits into the frame when the lens is framed. If it is specified that the frame cannot be bent, and if it is not possible to frame the lens without bending the frame, the eyeglass store 100
Error display 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 makes the tracing stylus contact the bevel grooves of the left and right frames of the eyeglass frame, rotates the tracing stylus about a predetermined point, and obtains the cylindrical coordinate values (Rn, θn, Z) of the shape of the bevel groove.
n) (n = 1, 2,..., N) is three-dimensionally detected,
The data is sent to the terminal computer 101. The terminal computer 101 performs smoothing of the data (there is no need to perform smoothing), the center coordinates (a, b, c) of the toric surface, the base radius RB, the cross radius RC, and the rotationally symmetric 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 on the spherical surface), peripheral length FLN of bevel groove, frame PD (interpupillary distance) FPD , The frame nose width DBL, the A size and the B size that are the maximum widths of the left and right and top and bottom of the frame, the effective diameter ED (a value twice the maximum radius), and the 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 there is a large disturbance in the data or a large difference between the left and right frame frames, an error message to that effect is displayed on the screen display device.

In the spectacles store 100, if an error message indicating that there is a large disturbance in the data is displayed on the screen display device, there is no fixed substance in the frame groove, or the seam of the frame is displaced, or Check that the measurement is not performed with the gap left, and perform the measurement again. Also,
When an error message indicating that there is a large difference between the shapes of the left and right frame frames is displayed on the screen display device, if the difference is allowable, a confirmation is input to confirm that the difference can be maintained. If is not allowed, the eyeglass frame shape may be corrected by hand and measured again, or the average of the left and right shapes may be obtained by calculation, and this may be designated as a merging specification for the eyeglass frame shape value. You may enter it.

[S7] The shape of the spectacle frame has already been measured.
If the result is stored, the measurement number given to the spectacle frame is input to read out the stored measurement value.

[S8] According to the measurement number, the stored spectacle frame shape information of the corresponding spectacle frame is read from the internal storage medium. By the above steps S1 to S8,
Eyeglass lens information, eyeglass frame information, prescription values, layout information
Information, processing conditions that are at least one of processing instruction information
Data is sent. [S9] The user designates "inquiry" or "order".

The data such as the lens information, prescription value, and frame information obtained by executing the above steps are transmitted to the main frame 20 of the factory 200 via the public communication line 300.
Sent to 1. While the transmission is being performed, the terminal computer 101 of the eyeglass store 100 displays a message indicating that the transmission is being performed. When ordering lenses, group transmission can be used, in which a maximum of, for example, 15 items can be transmitted at a time and transmission time can be reduced. In the group transmission, a procedure of confirming the contents of each order one by one, temporarily storing the contents, and then transmitting them collectively later is adopted.

FIG. 4 is a flowchart 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 numbers following S represent step numbers.

[S11] Main frame 2 of factory 200
01 includes an eyeglass lens ordering system program, an eyeglass lens processing design program, and a bevel processing design program. When data such as lens information, prescription values, frame information , layout information, and bevel information are transmitted via the public communication line 300, the eyeglass lens processing design program is activated via the eyeglass lens ordering system program, and the lens processing design calculation is performed. Is performed. That is,
A desired lens shape including the gen shape is calculated.

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

If there is no shortage in the outer diameter of the lens, the front curve of the lens is determined. For this determination, the left and right prescription values of the lens are first used to determine the left and right front curves separately, and then the left and right front curves are aligned. Note that this step is skipped in the case where the left and right front curves of the aspheric single focus lens are prohibited from being aligned. The table curve referred to here is approximated by a quadratic or quaternary aspherical surface with an aspheric single focus lens, and approximated by a secondary or quadratic aspherical surface in each direction with a progressive multifocal lens, as necessary. Have been.

Next, the thickness of the lens is determined. Normal,
Since the outer diameter of the lens is determined by the prescription value, the thickness of the lens is determined by the outer diameter, the standard edge thickness, and the prescription value. In addition, when the processing specification for setting the lens thickness to the minimum necessary value is set, the cover of the entire circumference for each radius in each direction of the frame is determined by the spectacle frame shape information, the layout information, and the prescription value. The thickness of the lens is checked to determine the thickness of the lens according to the specification.

After the thickness of the lens is determined, the back curve of the lens, the prism, and the prism base direction are calculated, and thereby the overall shape of the lens before the edging is determined. Here, the thickness of the edge around the entire circumference is checked for each moving radius in each direction of the frame, and it is checked whether there is a portion below the required edge thickness. If there is a portion that is lower than the predetermined value, the shortage direction and the shortage amount in the boxing system are calculated, and the process returns to the eyeglass lens ordering system program in order to display the shortage direction and the shortage amount on the terminal computer 101 of the eyeglass store 100.

If the thickness of the edge on the entire circumference is not insufficient, the lens weight, the maximum and minimum edge thicknesses, their directions, and the like 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 operation is performed by the terminal computer 210,
By rough rubbing machine 211 and sanding polishing machine 212,
This is necessary when the lens is polished before the edging, and various calculated values are passed to the next step.

When a stock lens that has already been processed is designated and lens polishing before edging is not performed, the lens outer diameter, lens thickness, table curve, Since the back curve is determined in advance and those data are stored, read out those values and confirm whether the outer diameter of the lens and the edge thickness are sufficient as in the case of the above-mentioned processed back surface, Pass to the next step. Also in the case of the stock lens, the surface curve of the aspheric single focus lens and the progressive multifocal lens is approximated to the aspheric surface as necessary, similarly to the case of the polished lens.

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

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

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

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

As described above, the design calculation of 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. Then, the process proceeds to step S14.

[S14] Main frame 2 of factory 200
The terminal computer 101 displays the expected shape of the lens or the error state at the time of completion of the beveling process on the screen display device based on the result of the inquiry sent from the terminal 01. The operator of the optician 100 changes or confirms the designated input information according to the displayed content.

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

If an error has occurred in the machining design calculations in steps S11 and S12 in FIG. 4, a message corresponding to the content of the error is displayed on the screen display device of the terminal computer 101 in FIG. Is done.

[S15] If the designation in step S9 of FIG. 3 is "order", this step is executed and step S1 is executed.
It is determined whether an error has occurred in the machining design calculation in step 1 and step S12. If an error has occurred, the result is sent to the eyeglass store 10 via the public communication line 300.
0 to the terminal computer 101 and proceeds to step S17. On the other hand, if no error has occurred, the result is sent to the terminal computer 101 of the eyeglass shop 100 via the public communication line 300, and the process proceeds to step S16.
The process proceeds to step S18 and thereafter (FIG. 5) to execute actual machining.

[S16] An indication that "the order has been accepted" is displayed on the screen display device of the terminal computer 101 of the eyeglass store 100. Thereby, it can be confirmed that the lens before the edging process or the lens after the beveling process that can be reliably framed in the frame can be ordered.

[S17] Since the lens of the order is a lens that cannot be processed because of an error in the lens processing design calculation or the bevel processing design calculation, a message indicating that the order cannot be accepted is displayed.

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

[S18] If "order" is specified in step S9 and no error has occurred in the processing design calculation of the lens or the bevel, this step is executed. That is, the result of the lens processing design calculation in step S11 is previously stored in the terminal computer 2 in FIG.
10, the rough rubbing machine 211 and the sanding polisher 2
In step 12, the curved surface of the back surface of the lens is finished in accordance with the transmitted calculation result. Furthermore, dyeing and surface treatment are performed by a device (not shown), and processing up to before the edging is performed. When a stock lens is designated, this step is skipped.

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

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

[S21] The lens fixed to the block jig is mounted on 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 of the front surface or the rear surface of the lens specified in advance are measured. The measured value obtained here is stored for use as operation data in step S22.

[S22] The main frame 201 in FIG. 2 performs the same calculation as the beveling design calculation in step S12. However, in actual processing, an error may occur between the calculated lens position and the actual lens position. Therefore, when the coordinate conversion into the processing coordinates is completed, this error is corrected. That is, the error between the calculated lens position and the actual lens position is corrected based on the measured values of the three points measured in step S21.
Otherwise, the same calculation as the beveling design calculation in 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 processing coordinates when grinding with a grindstone having a predetermined radius is calculated. A detailed description of the contents of this step will be described later with reference to FIG. 19 after a detailed description of step S12.

[S23] The processing locus 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 rotating grindstone for grinding and performing beveling and beveling of a lens that is controlled to move in the Y-axis direction (perpendicular to the spindle axis direction). An NC control grinding device capable of at least three-axis control of rotation angle control (spindle shaft rotation direction) and Z-axis control for controlling movement of a grindstone or lens in the Z-axis direction (spindle axis direction) to perform beveling. In accordance with the transmitted data, edge trimming and beveling of the lens are performed. Note that the lens grinding device 241 performs a grinding process using a grindstone. Alternatively, a cutting device that includes a cutter and performs a cutting process can be used.

[S24] The peripheral length and the shape of the bevel apex of the bevel-finished lens are measured by the terminal computer 250 and the bevel apex shape measuring device 251. 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 attached, the bevel vertex measuring probe is brought into contact with the bevel vertex of the lens, and measurement is started. Let it. The measured value is input to the terminal computer 250 and displayed on the display device.

Then, the terminal computer 250 calculates the design bevel vertex circumference determined by the calculation in step S12,
Compare the measured value measured by the shape measuring instrument 251,
If the difference between them is within 0.1 mm, for example, it is determined that the product is acceptable.

Further, 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. If it is within 1 mm, it is judged as a passing product.

[S25] The bevel position and the shape of the bevel-finished lens are compared with the drawing of the bevel position indicated in the processing instruction created based on the result calculated in step S12, and the quality of the bevel is compared. To inspect. Also,
An appearance inspection is performed to determine whether scratches, burrs, chips, or the like have occurred on the lens due to the edging process.

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

[S31] Polar coordinate values (Rn, θn) indicating a moving radius 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, rotationally symmetric axial unit vector (p, q,
r) from the terminal computer 101 of FIG. 2 (see step S6), the rectangular coordinate values (Xn, Yn, Zn) of the three-dimensional eyeglass frame shape (n = 1, 2,...,
N). 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 values. In the drawing, among the rectangular coordinate values (Xn, Yn, Zn) of the three-dimensional eyeglass frame shape, the two-dimensional rectangular coordinate values (Xn, Yn) are polar coordinate values (Rn, θn).
Is converted to orthogonal coordinates, and Zn is calculated as a Z-axis coordinate value at (Xn, Yn) on a given toric surface. Here, the terminal computer 1
Data given from 01 is data in a state where the front direction of the spectacle frame coincides with the Z-axis direction.

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

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

Since the terminal computer 101 gives the bevel groove circumference FLN which is the actually measured circumference of the spectacle frame based on the three-dimensional measured value of the spectacle frame shape (step S6).
), And their ratio (= FLN / FLNK) is calculated to calculate the coefficient k. Since this coefficient k corresponds to an error associated with the restoration of the three-dimensional spectacle frame shape, the coefficient k is converted to the orthogonal coordinate values (Xn, Y) of the three-dimensional spectacle frame shape obtained above.
n, Zn) (n = 1, 2,..., N) to correct the error. 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. The rectangular coordinate values (Xn,
Yn, Zn) is multiplied by a coefficient k to obtain (kX
(n, kYn, kZn) as the coordinate values of the spectacle frame 12
Are new eyeglass frame shapes after correction. The new eyeglass frame shape after this correction is re-coordinated (Xn, Yn, Zn)
(N = 1, 2,..., N).

Further, a perimeter correction coefficient CF is read out for each material of the spectacle frame input in advance, and coordinate values (Xn, Yn, Zn) are corrected in the same manner as the coefficient k. This correction is performed mainly to absorb an error caused by expansion and contraction of the material of the eyeglass frame.

The above-described correction methods include a method of partially accumulating and adding errors, in addition to a method of multiplying coefficients, and the present invention may be executed by the latter method. The above calculation process is performed on the left and right eyeglass frames.

[S32] The positional relationship between the lens and 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, “frame coordinates” are defined in which the datum line, which is the horizontal reference axis of the glasses, is set as the X axis, the vertical direction of the glasses is set as the Y axis, and the front direction of the glasses is set as the Z axis. The calculated two eyeglass frame shape coordinate values (X
n, Yn, Zn) (n = 1, 2,..., N).

That is, first, the X coordinate values of the most nose-side points 13 and 14 of each eyeglass frame shape are -HDBL and H, respectively.
The two spectacle 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) are translated.

The angle formed by the front direction of the spectacles and the front direction of the spectacle frame is the point 1 by the tilt TILT (see step S6) given from the terminal computer 101.
The two spectacle frame shape coordinate values that have been translated are rotated about the straight lines passing through 3 and 14 and parallel to the Y axis.

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

The eye point positions 15 and 16 are points to be positioned at the center of the pupil of the wearer when wearing the glasses on the front surface of the spectacle lens. The layout information includes the center line of the pupil from the center line of the nose of the wearer. The horizontal distance to the HPD,
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, the 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). Also, the Z-axis coordinates of the eye point positions 15 and 16 and the normal direction 1 on the front surface of the spectacle lens at these eye point positions
Regarding items 7 and 18, the bevel position is determined in the case of an ordered product whose bevel position is specified in advance, but in other cases, the bevel position has not been determined yet, and therefore it cannot be specified. Therefore, for the time being, assuming that the points 13 and 14 are the front surfaces of the lens, the Z-axis coordinates of the eye point position are determined.
Also, the normal directions 17, 18 on the front surface of the spectacle lens at the eye point position match the front directions 19, 20 of the spectacle frames, respectively, so that the eye point position 15,
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 eyeglass frames, is defined by a unit vector BV. That is, the direction parallel to the X axis and from the ear side to the nose side is defined as the direction of the unit vector BV.

[S33] A point serving as a reference when holding the lens for performing the beveling is referred to as a processing origin, and a direction perpendicular to the tip end of the bevel is referred to as a processing axis direction. Then, the coordinates having the processing origin as the coordinate origin and the processing axis direction as the Z-axis direction are referred to as “processing coordinates”.
The three-dimensional eyeglass frame shape data and lens position data obtained in step 2 are transferred to the processing coordinates.

That is, although the processing origin can be arbitrarily determined, here, for example, a straight line that passes through the geometric center (frame center) of the spectacle frame and is parallel to the front direction of the spectacle frame is defined as:
The point that intersects with the front surface of the lens at the position determined in step S32 is defined as the processing origin. The processing axis direction varies depending on how the lens is held. For example, when the front surface of the lens is considered as a reference, 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-transformed.

Hereinafter, the tip of the bevel mountain is referred to as the bevel tip, and the bottom surface of the base of the bevel is referred to as the bevel bottom. Since the three-dimensional eyeglass frame shape data is also the trajectory of the tip of the bevel, this is hereinafter referred to as a 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 processing coordinates, a two-dimensional bevel base in which the trajectory of the bevel bottom is projected on the XY plane along the Z axis of the processing coordinates. Find the shape. This is shown in FIG.
This will be described with reference to FIG.

FIG. 9 is a plan view showing a bevel tip shape and a 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
Is deformed by the bevel height BH in the normal direction of the shape, so that the coordinate value of the two-dimensional bevel tip shape 21 is (Xbn, Ybn) (n = 1, 2,..., N), The coordinate value of the two-dimensional bevel bottom shape 22 is represented by (Xn, Yn) (n =
1, 2,..., N) and j of the two-dimensional bevel tip shape
Assuming that 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
bj) by adding a normal vector (SVxj, SVyj). By calculating this from j = 1 to j = N, the coordinate value (X
n, Yn) (n = 1, 2,..., N).

Next, based on the lens front and back curves determined in step S11 and the coordinate values (Xn, Yn) (n = 1, 2,..., N) of the two-dimensional bevel bottom shape, Coordinate values of two-dimensional bevel bottom shape (Xn, Yn)
(N = 1, 2,..., N) j-th point (Xj, Y
In step j), the Z coordinate Zfj of the front surface of the lens and the Z coordinate Zrj of the rear surface of the lens are calculated. 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, and
Coordinate values (Xn, Yn) of the two-dimensional bevel bottom shape (n = 1,
, N) corresponding to the front three-dimensional bevel bottom shape (Xfn, Yfn, Zfn) (n = 1, 2,...)
., N), 3D beveled bottom shape of lens rear surface (Xrn, Y
rn, Zrn) (n = 1, 2,..., N) and the lens edge thickness ETn (n = 1, 2,..., N).

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

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

Here, the distance from the front surface of the lens at the bottom of the bevel to the base of the bevel peak is defined as the advance amount FOV, and the bevel width, which is the distance between the bases of the bevels, is defined as 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 vertex in the case of <BW will be described with reference to FIG.

FIG. 10 is a cross-sectional view showing a cross section of the lens 23 taken along a plane including the normal direction at the coordinate values (Xj, Yj) and the Z-axis direction of the processing coordinates. In this cross section, Zaj is replaced by two bevels 23 on the bevel of lens 23.
The lengths of a and 23b are determined to be equal.

The above-mentioned determination of Zaj is made from j = 1 to j = N
By executing the above, the two-dimensional bevel bottom shape (Xn,
Yn) The Z coordinate Zan (n = 1, 2,..., N) of the bevel vertex corresponding to (n = 1, 2,..., N) is determined.

[S36] In accordance with the designated bevel mode of 1: 1, the j-th 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 bevel vertex corresponding to coordinate value (Xj, Yj)
aj is determined based on the following equation (5) and the like.

When ETj ≧ BW, Zaj = Zfj−ETj / 2 (5) When ETj <BW, ETj <BW in step S35
Is determined in the same manner as in the case of (1).

The above determination of Zaj is performed from j = 1 to j = N
By executing the above, the two-dimensional bevel bottom shape (Xn,
Yn) The Z coordinate Zan (n = 1, 2,..., N) of the bevel vertex corresponding to (n = 1, 2,..., N) is determined.

[S37] In accordance with the specified bevel mode of 1: 2, the j-th 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 bevel vertex corresponding to 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)
When: Zaj = Zfj−BW / 2−1 (mm) (7) When ETj> 3 · BW / 2 + 3 (mm), Zaj = Zfj−ETj / 3 (8) ETj <BW , ETj <BW in step S35
Is determined in the same manner as in the case of (1).

The above-mentioned determination of Zaj is performed from j = 1 to j = N
By executing the above, the two-dimensional bevel bottom shape (Xn,
Yn) The Z coordinate Zan (n = 1, 2,..., N) of the bevel vertex corresponding to (n = 1, 2,..., N) is determined.

[S38] In the case of the convex bevel mode, the three-dimensional bevel tip shape (X
bn, Ybn, Zbn) (n = 1, 2,..., N) and a bevel vertex Z-axis coordinate value Zan (n = 1, 2,...) representing a target bevel shape ., N). Therefore, the three-dimensional bevel tip shape is deformed without changing the circumferential length so that Zbn matches Zan. Further, a deformation amount MD accompanying the deformation is calculated. This will be described separately for steps S38-1 to S38-5.

[S38-1] Y of three-dimensional bevel tip shape
When the axis coordinate Ybn has a maximum value, n is j1, and when the axis coordinate Ybn has a minimum value, n is j2. First, Zbj1 is replaced by Za
In order to make it coincide with j1, the entire three-dimensional bevel tip shape is translated in the Z-axis direction, and then passes through a point (Xbj1, Ybj1, Zbj1) on the three-dimensional bevel tip shape, and is parallel to the X axis. The entire three-dimensional bevel tip shape is rotated to make Zbj2 coincide 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 coincide with (Xan, Yan). By taking into account the determined angle and distance and repeating the rotational movement, the amount of change can be made substantially unaffected.

[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
j1), the adjacent point n when viewed clockwise with respect to j1) is set as j3, and the point (Xbj is set so that Zbj3 matches Zaj3).
, Ybj1, Zbj1) and a point (Xbj2, Ybj2,
Zbj2) and a three-dimensional bevel tip shape (Xbn, Ybn, Zbn) (n = 1, 2,.
, N) is deformed by rotating and moving [FIG.
(A)]. In addition, the absolute value of the rotation angle at this time is calculated as a deformation amount M
Add to D. Note that the part of the three-dimensional bevel tip shape refers to a part of the three-dimensional bevel tip shape starting from a point of n = j1 and extending to a point of n = j2 in a clockwise direction. When the deformed side includes the nose side point P that 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 is used. The vector BV is similarly rotated and converted into a new vector.

After the above transformation processing, the point of n = j3 is renewed.
Reset to n = j1 (FIG. 11B).Figure 11
And the solid shape of the tip of the bevel after deformation
Are indicated by broken lines (similarly in FIG. 12). Note that the 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 point p2 indicates a final burnt position (target position).
When indicating the rotation position, the rotation angle corresponds to the angle md.
[S38-3] Next, the point (Xbj2, Ybj2, Zb
Looking counterclockwise to j2), let n be the next point, j3.
Then, the point (Xbj) is set so that Zbj3 matches Zaj3.
, Ybj1, Zbj1) and a point (Xbj2, Ybj2,
Zbj2), and a three-dimensional bevel tip
Shape (Xbn, Ybn, Zbn) (n = 1, 2,...)
, N) is deformed by rotating and moving [FIG.
(B)]. In addition, the absolute value of the rotation angle at this time is calculated as a deformation amount M
D is further added. The three-dimensional bevel tip shape
A part is n = j clockwise starting from the point of n = j1.
It refers to the portion of the three-dimensional bevel tip shape up to point 2. Ma
Also, on this deformed side, bevel tip shape closest to the nose
If the nose side point P is included, the nose width direction unit vector
Tor BV is also rotated again and converted to a new vector
I do.

After the above deformation processing, the point of n = j3 is reset to n = j2 (FIG. 11C). Step S above
38-2 and step S38-3 are repeated in order, and if 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 in 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
j1), the n of the adjacent point viewed in the counterclockwise direction is set to j3, and the point (Xbj) is set so that Zbj3 coincides with Zaj3.
, Ybj1, Zbj1) and a point (Xbj2, Ybj2,
Zbj2) and a three-dimensional bevel tip shape (Xbn, Ybn, Zbn) (n = 1, 2,.
., N) is deformed by rotating and moving [FIG.
(A)]. Also, the absolute value of the rotation angle at this time is calculated by the deformation amount MD added in steps S38-2 and S38-3.
Is further added to. Note that a part of the three-dimensional bevel tip shape is defined as n = j in a counterclockwise direction from a point of n = j1.
It refers to the portion of the three-dimensional bevel tip shape up to point 2. If 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 is used. The vector BV is similarly rotated and converted into a new vector.

After the above deformation processing, the point of n = j3 is reset to n = j1 (FIG. 12B). [S38-5] Next, the point (Xbj2, Ybj2, Zb
j2), the next point n when viewed clockwise with respect to the point (Xbj) is set to j3, and Zbj3 coincides with Zaj3.
, Ybj1, Zbj1) and a point (Xbj2, Ybj2,
Zbj2) and a three-dimensional bevel tip shape (Xbn, Ybn, Zbn) (n = 1, 2,.
., N) is deformed by rotating and moving [FIG.
(B)]. In addition, the absolute value of the rotation angle at this time is calculated as a deformation amount M
D is further added. Note that a part of the three-dimensional bevel tip shape is defined as 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 j2. 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 similarly rotated again and converted to a new vector.

After the above deformation processing, the point of n = j3 is reset to n = j2 (FIG. 12C). Step S above
38-4 and step S38-5 are repeatedly executed in order, 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-mentioned step S38 is performed. -4 and the execution of step S38-5 are terminated.

Thus, the three-dimensional bevel tip shape (Xbn, Ybn, Zbn) representing the actual bevel shape (n = 1, 2)
2,..., N) are the bevel vertex Z-axis coordinate values Zan (n = 1, 2) representing the target bevel shape.
2,..., N), without changing the circumference. In addition, instead of the above method,
Use other methods to deform without changing the circumference.
You may.

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 point (Xbj2, Ybj1).
bj2, Zbj2). In the figure, step S38- is performed for the first time.
When the absolute value of the rotation angle when MD2 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), MD1 of both steps is used. If the rotation direction of a part of the three-dimensional bevel tip shape by execution is the same (FIG. 13 corresponds to this case), the deformation amount MD is added by twice as large as MD0. The final deformation amount MD is obtained by subtracting the minutes.

Note that, after the step S45, which will be described later, and after the re-execution from the step S34, the value obtained by adding MD0 to the deformation amount MD obtained here is newly obtained.
far.

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

[S40] In the case of the 1: 2 bevel mode,
Three-dimensional bevel tip shape (Xb
n, Ybn, Zbn) (n = 1, 2,..., N)
The axis coordinate value Zbn does not match the bevel vertex Z-axis coordinate value Zan (n = 1, 2,..., N) representing the target bevel shape. Therefore, the three-dimensional bevel tip shape is deformed without changing the circumferential length so that Zbn matches Zan. Further, a deformation amount MD accompanying the 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, this step will be described with reference to FIG. FIG. 14 is a perspective view of the lens showing the bevel apex position.

First, the Z-axis coordinate value Zan (n = 1, 1) of the bevel apex is obtained by the same processing as in step S35 for convex shaping.
2,..., N). Next, a three-dimensional bevel tip shape (Xbn, Ybn, Zbn) (n = 1, 2,...)
・, N) is translated in the Z-axis direction of the machining coordinates, and
Rotate and move by the axis perpendicular to the Z axis passing through the machining origin,
Z-axis coordinate Zbn (n = 1, 2, 2) of the three-dimensional bevel tip shape
.., N) are Zbn ≦ Zan (n = 1, 2,...)
., N) and M given by the following equation (9)
Is set to the minimum value. Then, the Z-axis coordinate Zbn of the new three-dimensional bevel tip shape after the movement (n = 1,
2,..., N).

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

Next, the Z-axis coordinate Zbn (n = 1, 2,..., Zn) of the new three-dimensional bevel tip shape obtained by the movement.
For N), Zbn = Zan or Zbn ≧ Zrn
It is checked whether or not + BW / 2 holds for all of n = 1, 2,..., N.

As a result, if not established, an error code is output to the effect that a bevel in accordance with the frame cannot be set, and the calculation is terminated. On the other hand, if it is established, the data newly obtained here is the final three-dimensional bevel tip shape (Xbn, Ybn, Zbn) when the frame tracing is specified.
(N = 1, 2,..., N) and the nose width direction unit vector BV.

Since the spectacle frame is not deformed in the frame-like manner, the deformation amount MD is 0 in the bevel mode in the frame-like manner. [S42] Although it is ideal that the spectacles are convex in appearance,
Convexity often requires considerable deformation of the eyeglass frame. For this reason, in the automatic beveling, the bevel is brought as close as possible to a convex position within a range in which the deformation of the spectacle frame is allowed.

The contents of this step will be described with reference to FIG. FIG. 15 is a perspective view of the lens showing the bevel apex position. First, the Z-axis coordinate value of the bevel vertex is changed to Ztn (n
= 1, 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 Z is passed through the machining origin.
By rotating and moving along an axis perpendicular to the axis, the Z-axis coordinate Zbn (n = 1, 2,..., N) of the three-dimensional bevel tip shape is
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 the movement are represented by (Xbfn, Ybfn, Zbfn).
(N = 1, 2,..., N).

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

This deformation amount MDt is compared with a 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 previous 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 converted into three-dimensional bevel tip shapes (Xbn, Ybn, Ybn, Zbn) (n = 1,
2,..., N), the nose width direction unit vector BV, and the deformation amount MD, and this step S42 ends.

On the other hand, when the deformation amount MDt exceeds the limit amount MDlim, the Z coordinate value Zan (n = 1, 1) of the top of the bevel when the bevel mode of auto bevel is designated.
2,..., N) are determined based on the following equations (11), (12) and the like.

ETj ≧ BW and LMj ≧ Zbfj +
(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 means that in the j-th three-dimensional bevel bottom shape, Zaj is located on the rear surface of the lens. This is a limit value to be shifted, and is given by, for example, the following equation (13).

LMj = Zfj−ETj / 2 (13) FIG. 16 shows the positions of variables used in the above equations (11), (12), and (13), and shows coordinate values (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 in J), and the Z-axis direction of processing coordinates.

When ETj <BW, the determination is made in the same manner as the determination method of 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 auto bevel is designated
(N = 1, 2,..., N) is determined.

The Z-coordinate value Za of the determined bevel vertex
n (n = 1, 2,..., N) at step S3
8 is performed, 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 MD.

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

[S44] After the deformation of the three-dimensional bevel tip shape is completed, the post-deformation position of the eye point position determined in step S32 is calculated, and the error from the eye point position specified in advance is corrected. This will be described with reference to FIG.

FIG. 17 is a perspective view of a three-dimensional bevel tip shape of one eye showing an eye point position and the like. In the figure, if a 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 obtained. -Eye PD (horizontal distance from the center line of the nose of the wearer to the center of the pupil) HPDa
Is calculated by the following equation (14) from the unit vector BV in the nose width direction and HDBL which is an amount of １ ／ of the nose width of the glasses.

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

ΔDb = EPBV * BV + HDBL−HPD (15) Therefore, if the component of the unit vector BV in the nose width direction is (X _BV , Y _BV , Z _BV ), the three-dimensional bevel tip shape (Xbn, Ybn) , 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

[0137] _{Xcn = Xbn-X BV · δDb} ··· (16) Ycn = Ybn-Y BV · δDb ··· (17) Zcn = Zbn-Z BV · δDb ··· (18) 3 -dimensional corrected 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 wearer's pupil) EPHT at the time when the deformation of the three-dimensional bevel tip shape is completed EPHT
a may be obtained, and an error from the designated eye point height EPHT may be corrected. This will be described with reference to FIG.

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

When the deformation of the three-dimensional bevel tip shape is completed, (Xbn, Ybn, Zbn) (n = 1, 2,.
.., N) and the inner product of the unit vector CV in the Y-axis direction of the frame coordinates with the coordinate value of each point, and the point where the inner product becomes the maximum value is (Xbp, Ybp, Zbp), and the inner product is the minimum value. Is defined as (Xbq, Ybq, Zbq), the midpoint (Xbm, Ybm, Zbm) between the two points is expressed 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 deformed three-dimensional bevel tip shape, and a vector starting from this point and ending at the eye point position 26 on the front surface of the lens is referred to as EPCV. For example, the eye point height EPHTa at the time when the deformation is completed is calculated by the following equation (22).

EPHTa = EPCV * CV (22) Accordingly, the error amount δDc of EPHTa from 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), Three-dimensional burnt
Error correction of the tip shape (Xbn, Ybn, Zbn)
3D bevel tip shape after (Xdn, Ydn, Zdn)
(N = 1, 2,..., N) are given 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) The 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 stored as MD0, and step S3
4 to step S44, the error amounts δDb and δD
The process 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). 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) (n =
, N), the same processing as the processing in step S34 is executed to obtain the final three-dimensional bevel bottom shape (Xfj, Yfj, Zfn) (n = 1, 2, 2)・
.., N), 3D beveled bottom shape of lens rear surface (Xrj,
Yrj, Zrn) (n = 1, 2,..., N) and the edge thickness ETn (n = 1, 2,..., N) of the lens.

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 the lens cross section cut through a plane parallel to the normal direction at (Xj, Yj) and the Z-axis direction of the processing coordinates at (Xj, Yj), the slope of the bevel determined by the three-dimensional bevel tip shape on the lens front side ( (Corresponds to 23b in FIG. 10)
Re-examines the point of intersection with the front of the lens (Xfj, Yfj,
Zfj) and the bevel on the rear side of the lens (FIG. 10).
(Corresponding to 23a in FIG. 3) is newly set to (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 in step S12 in FIG. 4 is performed. However, in 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 ascertain the actual position of the lens 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 measured in advance in step S 21 ( Xsm, Y
sm, Zsm) (m = 1, 2,..., M), and the calculated front or rear position of the lens corresponding to the measurement position data is (Xsm, Ysm, Ztm) (m = 1, 2, 2).
.., M). Here, the total sum DZ of errors in the Z-axis direction is calculated based on the following equation (27).

DZ = Σ (| Zsi−Zti |) (i = 1 to M) (27) Then, three-dimensional spectacle frame shape data, lens position data, and computationally defined on processing coordinates The nose width direction vector BV is calculated by rotating the nose width vector
By the parallel translation in the axial direction, DZ is moved to a minimum.

As described above, after correcting the error between the calculated lens position and the actual lens position so as to be minimized, step S34 and subsequent steps in FIG.
Final three-dimensional bevel tip shape (Xbn, Ybn, Zb
n) (n = 1, 2,..., N).

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

FIG. 19 is a plan view showing the bevel tip shape and the processing locus projected on the XY plane. First, 3
-Dimensional bevel tip shape (Xbn, Ybn, Zbn) (n =
, 2,..., N) projected onto the XY plane of the processing coordinates,
Ask for.

That is, the coordinate value of the two-dimensional bevel tip shape 27 is represented by (Xbn, Ybn) (n = 1, 2,...,
N) The coordinate values of the two-dimensional machining locus 28 are represented by (Xgn, Yg
n) (n = 1, 2,..., N), the two-dimensional machining locus 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,
Ybj) is expressed as (SVxj, SVy
j), the coordinate value (Xgj, Ygj) of the corresponding two-dimensional machining trajectory 28 becomes (Xbj, Ybj) as (SVx
j, SVyj). By calculating this from j = 1 to j = N, a two-dimensional machining locus (Xgn, Ygn) (n = 1, 2,..., N) can be obtained.

The three-dimensional machining locus (Xgn, Yg
n, Zgn) (n = 1, 2,..., N) Z coordinate value Z
gn is a three-dimensional bevel tip shape (Xbn, Ybn, Zb
n) (n = 1, 2,..., N), the Z coordinate value Zbn is equal to Zgn = Zbn (n = 1, 2,..., N)
Can be obtained 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 replaced with a three-dimensional machining locus (Rgn, θg) in a cylindrical coordinate system.
(n, Zgn) (n = 1, 2,..., N) and is applied to the lens grinding device 241. The present invention relates to spectacles
Even when forming a groove bevel on the edge of a frameless eyeglass lens
Applicable.

[0157]

As described above, according to the present invention, 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 set to a predetermined value. By comparing with the limit value, it is determined whether or not the shape of the eyeglass frame is deformed, and the result is reflected in the setting of the bevel. As a result, the designated position of the bevel is changed, so that the bevel setting for securely fitting the beveled lens to the spectacle frame can be performed.

The predetermined limit value is set according to the material of the eyeglass frame. Therefore, in general, the tolerance of deformation of the spectacle frame varies 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 the drawings]

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

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

FIG. 3 is a flowchart showing a flow of an initial input process in an eyeglass shop.

FIG. 4 is a flowchart showing the flow of processing in a factory, and the steps of confirmation and error display performed in a spectacle store by transfer from the factory.

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

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

FIG. 7 is a rectangular coordinate value (Xn, Yn, Zn) of a spectacle frame shape.
FIG. 6 is a perspective view showing a spectacle frame shape when is corrected by a coefficient k.

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

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 including a normal 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 represented by a point (Xbj1, Y
bj1, Zbj1) and a point (Xbj2, Ybj2, Zbj)
FIG. 2 is a cross-sectional view when cut along a plane perpendicular to a straight line passing through 2).

FIG. 14 is a perspective view of a lens showing a bevel apex position.

FIG. 15 is a perspective view of a lens showing a bevel apex position.

FIG. 16 is a cross-sectional view illustrating a cross section of the lens taken along a plane including a normal direction at a coordinate value (Xj, Yj) and a Z-axis direction of processing coordinates.

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

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

FIG. 19 is a plan view showing a bevel tip shape projected on an XY plane and a processing locus.

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

DESCRIPTION OF SYMBOLS 100 Eyeglass store 101 Terminal computer 102 Frame shape measuring device 200 Factory 201 Main frame 202 LAN 210 Terminal computer 211 Roughing machine (curve generator) 212 Sanding polishing machine 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

Claims (2)

(57) [Claims] 1. A spectacle lens bevel setting method for setting a bevel on an edge of a spectacle lens fitted to a deformable spectacle frame, comprising: setting a bevel on the edge of a spectacle lens based on a specified bevel mode; Calculating the deformation amount of the spectacle frame shape when deforming the spectacle frame shape so as to match the beveled, comparing the calculated deformation amount with a predetermined limit value set in advance, A spectacle lens bevel setting method, comprising determining whether or not the eyeglass frame shape is deformed based on a result and reflecting the result in setting of the bevel. 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.