WO2014156800A1 - Lens-processing controller, lens-processing control program, method for evaluating lens shape, and method for manufacturing spectacle lens - Google Patents

Abstract

A lens-processing controller provided with: an anticipated-shape-specifying means (201b) for determining the anticipated finished shape of a bevel cross-section, taking into account the amount of processing tool interference experienced when an unprocessed spectacle lens is beveled; a state-of-contact-specifying means (210c) for determining the state in which a measuring element of a lens-shape measuring gauge (251) makes contact with the bevel of a spectacle lens having the anticipated finished shape; a theoretical-shape-specifying means (210d) for adopting, as the theoretical shape of a beveled spectacle lens rim, the shape-measurement result to be obtained by the lens-shape measuring gauge (251) when the state of contact is to be reflected; and a shape-comparing means (250c) for comparing the theoretical shape and the actual shape actually obtained using the lens-shape measuring gauge (251) on the beveled spectacle lens rim, and evaluating the actual shape on the basis of the results.

Description

Lens processing control device, lens processing control program, lens shape determination method, and spectacle lens manufacturing method

The present invention relates to a lens processing control device, a lens processing control program, a lens shape determination method, and a spectacle lens manufacturing method used when performing bevel processing of spectacle lenses.

The spectacle lens to be fitted into the spectacle frame is formed through a lens shape process on the unprocessed lens. The lens shape processing is a processing for making the lens peripheral portion into a shape that can be put into a spectacle frame, and is generally performed using a lens processing machine called a target lens processing machine. When the target lens shape is processed, the processed spectacle lens is formed with a bevel having a shape corresponding to the frame shape of the spectacle frame to be framed on the periphery of the lens. Hereinafter, the bead processing for forming the bevel is referred to as “bevel processing”.

After such beveling is performed, it is necessary to determine whether or not the peripheral edge of the spectacle lens after processing is processed according to a desired shape. Therefore, in a lens processing site where beveling is performed, it is common to measure the shape of the lens peripheral portion after processing using a lens shape measuring instrument that measures the shape of the lens peripheral portion. The lens shape measuring instrument used in that case is configured to measure the shape of the lens periphery by moving a measuring element called a stylus in contact with the lens periphery while moving in the lens circumferential direction. Is known (see, for example, Patent Document 1).

Japanese Patent No. 3904212

However, when the shape measurement of the lens periphery is performed using the lens shape measuring instrument having the above-described configuration, the series of processes from the shape measurement to the pass / fail judgment are not always accurate and efficient for the reasons described below. This is not always possible.

The factors that cause the peripheral edge of the lens not to be processed according to the desired shape after beveling are mainly due to processing tool interference that may occur when performing beveling, and due to defects in the lens processing machine.

Machining tool interference that occurs during beveling is as follows. When beveling is performed on an unprocessed lens, the influence of the target lens shape to be processed, the curve of the lens to be processed, the diameter of the processing tool (grinding / cutting tool) used for processing, the bevel shape to be formed, etc. Therefore, during processing, the processing tool and the processed portion of the lens may interfere with each other at a point other than the theoretical cutting point. This is called “machining tool interference”. When machining tool interference occurs, parts other than the theoretical cutting point are also machined, so that the shape of the bevel to be formed becomes thin or distorted. Therefore, the processing tool interference becomes a factor that the lens peripheral portion is not processed according to the desired shape after the beveling.
In the processing tool interference, for example, when processing a flat lens, the trajectory in the circumferential direction of the bevel tip (hereinafter referred to as “bevel tip trajectory”) must be changed in the Z-axis direction (lens optical axis direction). For example, since the position of the machining tool does not need to change in the Z-axis direction, it does not occur. However, a general spectacle lens has a curve corresponding to the prescription content, and the bevel tip trajectory has a change in the Z-axis direction in most cases, so it is difficult to avoid the occurrence of the processing tool interference. It is.

Also, a defect in a lens processing machine is a defect that affects the result of the beveling process. Specifically, in a lens processing machine, at least one of the raw lens rotation axis or the processing tool rotation axis is in a position that is shifted from the original position due to misadjustment or a time-dependent reason, or the raw lens is blocked. When the fixed holding jig is attached to the lens processing machine, the origin position in the rotation direction (θ direction) is shifted from the original position due to work mistakes, etc., and the processing tool used with the lens processing machine There is a problem that there is a setting error in the tool diameter value. If such a problem occurs in the lens processing machine, the shape of the lens peripheral edge portion after the beveling using the lens processing machine is different from the desired shape. That is, the trouble in the lens processing machine becomes a factor that the lens peripheral portion is not processed as desired after the beveling. Note that a defect in the lens processing machine can be solved by feeding back to the lens processing machine a content that specifically identifies the defect.

As described above, there are two factors that cause the lens peripheral portion of the spectacle lens not to have a desired shape, that is, due to interference with the processing tool and due to a malfunction of the lens processing machine. However, in the conventional measurement of the shape of the periphery of the lens, these two factors are not separated. Therefore, for example, even if the result of determination that the lens periphery is not the desired shape is obtained by shape measurement, it is not known whether the result is due to the above two factors, that is, unavoidable or resolvable. Even if feedback to the processing machine is performed, a beveling result as a desired shape is not always obtained. That is, in the conventional shape measurement, a series of processes from the shape measurement to the pass / fail determination cannot always be performed accurately.

For example, it may be possible to cope with this point by calibrating the lens processing machine at a predetermined timing. Specifically, a flat lens that does not cause processing tool interference or a predetermined lens that can be handled equivalently is used as a test lens, and the test lens is beveled with a lens processing machine at a preset periodic timing. Measure the shape of the peripheral edge of the test lens after the beveling using a lens shape measuring instrument. As a result, if the peripheral edge of the lens is not processed according to the desired shape, Feedback is performed to solve the problem in the lens processing machine.
However, in that case, it becomes necessary to perform beveling, shape measurement, and the like for a test lens that is not originally a processing target for calibration of the lens processing machine. That is, it is difficult to realize efficient processing because the test lens needs to be processed.

Accordingly, the present invention performs a series of processing from shape measurement to pass / fail judgment accurately when measuring the shape of the spectacle lens after beveling and making a pass / fail judgment on the result. An object of the present invention is to provide a lens processing control device, a lens processing control program, a lens shape determination method, and a spectacle lens manufacturing method.

In order to achieve the above-described object, the inventor of the present application examined interference between a processing tool used for beveling and a processed portion of a lens, which causes thinning or distortion of the bevel shape. Interference is inevitable when considering lens curves etc., but the amount of interference at that time is known at the stage of beveling such as the shape and trajectory of the processing tool, the curve of the lens to be processed and the shape of the target lens It is possible to specify based on the information.
From this, the inventor of the present application obtains the predicted finish shape of the bevel cross-section considering the amount of interference of the processing tool, obtains the contact state of the probe of the lens shape measuring instrument with respect to the bevel of the spectacle lens having the predicted finish shape, The shape measurement result that would be obtained by the lens shape measuring instrument when the contact mode is reflected is the theoretical shape of the peripheral edge of the spectacle lens after beveling (hereinafter simply referred to as “theoretical shape”), and the theoretical shape. Based on the above, the idea was that the effect of the machining tool interference could be reduced to a negligible level when determining the quality of the beveled machining result. In other words, after accepting the occurrence of thinning and distortion of the bevel shape, and adopting a new concept of spectacle lens theoretical shape that takes into account the amount of processing tool interference that is the cause of that, In the pass / fail judgment, we thought that the influence of the processing tool interference could be reduced to a negligible level, and the influence of the lens processing machine failure, which is another factor that the lens peripheral part was not processed as desired, could be realized. .
The present invention has been made based on the above-described new idea by the present inventors.

According to a first aspect of the present invention, there is provided a predicted shape specifying means for obtaining a predicted finish shape of a bevel cross section in consideration of a processing tool interference amount when performing a bevel processing on an unprocessed spectacle lens, and a spectacle lens having the predicted finish shape Contact state specifying means for obtaining the contact state of the probe of the lens shape measuring instrument with respect to the bevel, and the shape measurement result that would be obtained by the lens shape measuring device when reflecting the contact state, Comparing the theoretical shape with the theoretical shape specifying means for the theoretical shape of the lens periphery and the actual shape obtained by the lens shape measuring instrument for the spectacle lens periphery after the bevel processing, and based on the comparison result, A lens processing control device comprising: a shape comparison unit that performs quality determination on a shape.
According to a second aspect of the present invention, in the invention described in the first aspect, the lens processing is performed by beveling the spectacle lens that has obtained the measured shape based on the comparison result between the measured shape and the theoretical shape. The machine includes a correction instruction means for causing the machining amount to be corrected by an amount corresponding to the difference between the actually measured shape and the theoretical shape.
According to a third aspect of the present invention, in the invention according to the second aspect, the correction instruction means only when the amount of difference between the measured shape and the theoretical shape exceeds a preset allowable range. A processing amount correction is performed by the lens processing machine.
According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the predicted shape specifying means includes the measurement unit for each measurement point set in a plurality of locations in the circumferential direction of the spectacle lens. A predicted finish shape is obtained, and the contact state specifying means obtains the contact state of the probe with respect to the bevel of the predicted finish shape for each measurement point.
According to a fifth aspect of the present invention, there is provided a predicted shape specifying means for obtaining a predicted finish shape of a bevel cross section in consideration of a processing tool interference amount when performing bevel processing on an unprocessed spectacle lens; Contact state specifying means for obtaining a contact state of a probe of a lens shape measuring instrument with respect to a bevel of a spectacle lens, and a shape measurement result that would be obtained by the lens shape measuring device when the contact state is reflected The theoretical shape specifying means for the theoretical shape of the spectacle lens periphery after the comparison, the actual shape actually obtained by the lens shape measuring instrument for the spectacle lens periphery after the beveling is compared with the theoretical shape, and based on the comparison result The lens processing control program is made to function as a shape comparison means for performing pass / fail judgment on the measured shape.
According to a sixth aspect of the present invention, in the invention according to the fifth aspect, the computer performs beveling of the spectacle lens that obtains the measured shape based on a comparison result between the measured shape and the theoretical shape. The lens processing machine is made to function as a correction instructing unit that causes the processing amount to be corrected by an amount corresponding to the amount of difference between the measured shape and the theoretical shape.
According to a seventh aspect of the present invention, there is provided a predicted shape specifying step for obtaining a predicted finish shape of a bevel cross section in consideration of a processing tool interference amount when performing a bevel processing on an unprocessed spectacle lens, and a spectacle lens having the predicted finish shape A contact mode specifying step for obtaining a contact mode of the probe of the lens shape measuring instrument with respect to the bevel, and a shape measurement result that would be obtained by the lens shape measuring instrument when reflecting the contact mode, The theoretical shape specifying step for setting the theoretical shape of the lens periphery, and the actual shape actually obtained by the lens shape measuring device for the peripheral edge of the spectacle lens after beveling are compared with the theoretical shape, and the comparison result is compared with the actual shape. A lens shape determination method comprising: a shape comparison step used for quality determination.
According to an eighth aspect of the present invention, the bevel processing of the spectacle lens that obtained the measured shape is performed based on the comparison result between the measured shape and the theoretical shape using the lens shape determination method according to the seventh aspect. A spectacle lens manufacturing method, comprising: a processing amount correction step of causing a performed lens processing machine to perform a processing amount correction corresponding to an amount of difference between the measured shape and the theoretical shape.

According to the present invention, when shape measurement is performed on a spectacle lens after beveling and a quality determination is performed on the result, a series of processes from the shape measurement to the quality determination are performed accurately and efficiently. Can do.

It is a mimetic diagram showing the example of whole composition of the spectacles lens supply system containing the lens processing control device concerning the present invention. It is explanatory drawing which shows an example of the rotary grindstone tool which the lens processing machine in the supply system of FIG. 1 uses for a bevel process. It is explanatory drawing which shows an example of the stylus with which the shape measuring device in the supply system of FIG. 1 is provided. It is a block diagram which shows the function structural example of the mainframe in the supply system of FIG. 1, and a terminal computer. It is a flowchart which shows the outline | summary of the procedure of the lens shape determination method which concerns on this invention. It is explanatory drawing (the 1) which shows the specific example of finish predicted shape specification by the lens shape determination method which concerns on this invention. It is explanatory drawing (the 2) which shows the specific example of finish predicted shape specification by the lens shape determination method which concerns on this invention. It is explanatory drawing (the 3) which shows the specific example of theoretical shape specification by the lens shape determination method which concerns on this invention. It is explanatory drawing which shows the specific example of planar view of the shape comparison by the lens shape determination method which concerns on this invention. It is a flowchart which shows the outline | summary of the procedure of the spectacles lens manufacturing method concerning this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, description will be made by dividing into items in the following order.
1. System configuration Functional configuration 3. Lens shape determination procedure 4. Procedure of eyeglass lens manufacturing method Effects of the present embodiment 6. Modifications etc.

<1. System configuration>
First, the configuration of the entire system in the present embodiment will be described. In addition, what is necessary is just to implement | achieve using the well-known technique (for example, refer patent 3075870) except the matter demonstrated below.
FIG. 1 is a schematic diagram showing an overall configuration example of a spectacle lens supply system including a lens processing control device according to the present invention.

(overall structure)
As shown in FIG. 1, an eyeglass lens supply system exemplified in the present embodiment is distributed and arranged in a spectacle store 100 that is an eyeglass lens ordering side and a lens manufacturer factory 200 that is a lens processing side. It is configured. In the example shown in the figure, only one spectacle store 100 is shown, but actually, a plurality of spectacle stores 100 may exist for one factory 200.

(Optical store side composition)
The spectacle store 100 is provided with an online terminal computer 101 and a spectacle frame measuring machine 102 that measures the frame shape of the spectacle frame and outputs frame shape data.
The terminal computer 101 includes an input device such as a keyboard and a mouse, and a display device such as a liquid crystal panel, and is connected to the factory 200 side via the public communication network 300 to exchange data with the factory 200 side. Configured to do.
The spectacle frame measuring machine 102 detects a cylindrical coordinate value of the shape of the frame groove in a three-dimensional manner by bringing a measuring element into contact with the frame grooves of the left and right frames of the spectacle frame and rotating the measuring element about a predetermined point. Then, the frame shape of the spectacle frame is measured. The measurement result is output to the terminal computer 101 as frame shape data of the spectacle frame.

On the side of the spectacle store 100 in which the terminal computer 101 and the spectacle frame measuring machine 102 are installed, the spectacle lens prescription value and the like desired by the customer are input by the terminal computer 101 and the frame shape data of the spectacle frame desired by the customer. Is output from the spectacle frame measuring machine 102 to the terminal computer 101, the terminal computer 101 transfers these contents online to the main frame 201 on the factory 200 side via the public communication network 300. ing.

(Factory configuration)
On the other hand, on the factory 200 side, a main frame 201 connected to the terminal computer 101 on the spectacle store 100 side via the public communication line network 300 is installed. The main frame 201 has a function as a computer device that executes a spectacle lens processing design program, a bevel processing design program, and the like, and a lens including a bevel shape based on input data from the terminal computer 101 on the spectacle store 100 side. It is comprised so that a shape may be calculated. The main frame 201 is connected to a plurality of terminal computers 210, 220, 230, 240, 250 installed on the factory 200 side via the LAN 202 in addition to the public communication network 300, and calculates the lens shape. The result is sent to each terminal computer 210, 220, 230, 240, 250.

A rubbing machine (curve generator) 211 and a sanding grinder 212 are connected to the terminal computer 210. Then, the terminal computer 210 controls the rough rubbing machine 211 and the sand grinder 212 while following the calculation result sent from the main frame 201 to finish the curved surface of the back surface (rear surface) of the front surface processed lens.

A lens meter 221 and a wall thickness gauge 222 are connected to the terminal computer 220. Then, the terminal computer 220 compares the measurement value obtained by the lens meter 221 and the thickness gauge 222 with the calculation result sent from the main frame 201, and the curved surface finishing of the lens back surface (rear surface) is completed. The acceptance inspection of the spectacle lens is performed, and a mark (three-point mark) indicating the optical center is attached to the passing lens.

A marker 231 and an image processor 232 are connected to the terminal computer 230. Then, the terminal computer 230 controls the marker 231 and the image processor 232 while following the calculation result sent from the main frame 201 to block (hold) the lens when performing edge trimming and beveling of the spectacle lens. ) Determine the blocking position to be performed, and add a blocking position mark. According to this blocking position mark, a jig for blocking is fixed to the lens.

The terminal computer 240 is connected to an NC control lens processing machine 241 and a chuck interlock 242. Then, the terminal computer 240 controls the lens processing machine 241 while following the calculation result sent from the main frame 201, and causes the lens processing machine 241 to process the eyeglass lens. The target lens shape processing includes “edging processing” in which an unprocessed lens is ground in accordance with the shape of the spectacle frame, and “beveling processing” in which a bevel is provided on the edged lens. The lens processing machine 241 that performs the target processing including the bevel processing corresponds to the “lens processing machine” in the present invention.

The terminal computer 250 is connected to a shape measuring instrument 251 for measuring the shape of the lens peripheral edge after beveling. The shape measuring device 251 that performs such shape measurement corresponds to the “lens shape measuring device” in the present invention. Then, the terminal computer 250 controls the shape measuring instrument 251 to cause the shape measuring instrument 251 to measure the circumference and shape of the beveled spectacle lens, and the calculation result sent from the main frame 201 Compared to, the quality of the beveling is judged.

On the factory 200 side configured as described above, the main frame 201 calculates the spectacle lens shape including the bevel shape based on the input data from the terminal computer 101 on the spectacle store 100 side, and each terminal while following the calculation result. The computers 210, 220, 230, 240, 250 control the lens processing machine 241, the shape measuring device 251, and the like, so that the spectacles that have been beveled and the lens peripheral shape and the bevel shape match the shape of the spectacle frame frame. Lenses are manufactured.

In the spectacle lens supply system having the above-described configuration, as will be described in detail later, it is necessary for the lens processing machine 241 to perform eyeglass processing of the spectacle lens mainly in the main frame 201, the terminal computer 240, and the terminal computer 250. Control processing is performed. That is, the main frame 201, the terminal computer 240, and the terminal computer 250 have a function as a “lens processing control device” according to the present invention.
In the eyeglass lens supply system having the above-described configuration, the “lens shape determination method” according to the present invention is mainly implemented in the main frame 201 and the terminal computer 250, as will be described in detail later.
Further, in the eyeglass lens supply system having the above-described configuration, as will be described in detail later, the “eyeglasses” according to the present invention is mainly configured by the main frame 201, the terminal computer 240, the lens processing machine 241, the terminal computer 250, and the shape measuring instrument 251. The “lens manufacturing method” is performed.

<2. Functional configuration>
Next, in the eyeglass lens supply system having the above-described configuration, a functional configuration for functioning as a lens processing control device according to the present invention, and a lens shape determination method and a spectacle lens manufacturing method according to the present invention are implemented. A functional configuration for this will be described.

(Lens processing machine)
Here, first, a lens processing machine 241 that performs edge-grinding and beveling of a spectacle lens will be described.

The lens processing machine 241 has a rotating grindstone for grinding that is controlled to move in the Y-axis direction (perpendicular to the spindle axis direction) and performs edge-grinding and beveling of the spectacle lens, and a block jig for fixing the lens. NC control capable of at least three-axis control: tool rotation angle control (spindle axis rotation direction) and Z-axis control that performs beveling by moving the grindstone or spectacle lens in the Z-axis direction (spindle axis direction) This is a grinding device.

FIG. 2 is an explanatory view showing an example of a rotating grindstone tool used by the lens processing machine 241 for beveling. The rotary grindstone tool 241a shown in the figure includes a grindstone portion 241c having a bevel groove 241b formed so as to correspond to a beveling slope on the front side of the lens and a beveling slope on the rear side of the lens. And it is comprised so that a bevel process may be performed with respect to the perimeter of the spectacle lens 241e by moving along the lens periphery, rotating around the rotating shaft 241d.

The trajectory when moving such a rotating grindstone tool 241a along the lens periphery is calculated by the main frame 201. The main frame 201 performs a bevel machining design calculation by starting the bevel machining design program. That is, based on the input data from the terminal computer 101 on the spectacle store 100 side, a design operation for three-dimensional beveling is performed to calculate the final three-dimensional bevel tip shape, and the calculated three-dimensional bevel tip shape. Based on the above, three-dimensional machining trajectory data on the machining coordinates when grinding with the rotary grindstone tool 241a having a predetermined radius is calculated.

However, since the three-dimensional machining trajectory data calculated by the main frame 201 corresponds to the three-dimensional bevel tip shape, in most cases it has a displacement in the Z-axis direction. Therefore, in the lens processing machine 241, when the beveling is performed according to the three-dimensional processing trajectory data from the main frame 201, the bevel groove of the rotary grindstone tool 241a is three-dimensionally formed on the bevel processing slope assumed on the data. Interference may occur and the bevel apex that is actually processed becomes smaller than expected. In other words, in the lens processing machine 241, even if the beveling is performed according to the three-dimensional processing trajectory data from the main frame 201, the lens processing machine 241 is formed due to the interference with the rotating grindstone tool 241a that is displaced in the Z-axis direction during the beveling. The bevel shape may be thinned, distorted, or the like, and the bevel may not be located at the position assumed during the beveling process. It can be said that the occurrence of such tool interference is inevitable in consideration of a lens curve and the like.

(Shape measuring instrument)
Next, the shape measuring instrument 251 that measures the circumference and shape of the beveled lens will be described.

The shape measuring instrument 251 includes a stylus as a probe for measuring the bevel apex, and is configured to measure the circumference and shape of the beveled spectacle lens using the stylus.

FIG. 3 is an explanatory diagram showing an example of a stylus included in the shape measuring instrument 251. The stylus 251a shown in the figure has a contact portion 251b provided with a V-shaped groove that matches a predetermined bevel shape along the circumference, and this contact portion 251b is a bevel of a beveled spectacle lens. It is comprised so that it may contact | abut to 251c.

The shape measuring instrument 251 performs measurement while moving the stylus 251a in the circumferential direction of the lens in a state where the stylus 251a is in contact with the bevel 251c of the spectacle lens. More specifically, the stylus 251a is moved while rolling, and the three-dimensional cylindrical coordinate value of each bevel 251c at that time is measured. That is, the movement distance, rotation angle, and vertical movement distance of the stylus 251a in the lens circumferential direction are measured. Then, from the three-dimensional cylindrical coordinate value of the bevel 251c measured in this way, the passing trajectory of the virtual bevel apex predetermined by the stylus is recognized, and the circumference and three-dimensional shape of the passing trajectory are calculated. Is sent to the terminal computer 250 as the peripheral length and shape of the beveled spectacle lens.

(Mechanical structure of mainframe and terminal computer)
Subsequently, functional configurations of the main frame 201 and the terminal computers 240 and 250 will be described in detail.
FIG. 4 is a block diagram illustrating a functional configuration example of the main frame 201 and the terminal computers 240 and 250.

As shown in the figure, the main frame 201 has functions as data acquisition means 201a, predicted shape specifying means 201b, contact mode specifying means 201c, theoretical shape specifying means 201d, and theoretical shape notifying means 201e.
In addition, the terminal computer 250 has functions as a theoretical shape acquisition unit 250a, an actual measurement shape acquisition unit 250b, a shape comparison unit 250c, and a determination result output unit 250d.
Further, the terminal computer 240 has functions as a determination result acquisition unit 240a and a correction instruction unit 240b.
Hereinafter, each of these means 201a to 201e, 250a to 250d, and 240a to 240b will be described in order.

The data acquisition unit 201a acquires data necessary for specifying a theoretical shape to be described later. As data to be acquired, for example, data (lens curve data or the like) for specifying the lens shape after performing the edge processing and the bevel processing, the shape data of the rotating grindstone tool 241a of the lens processing machine 241, the rotating grindstone thereof Examples thereof include three-dimensional machining locus data on machining coordinates when grinding with the tool 241a, shape data of the stylus 251a of the shape measuring instrument 251, and the like. These data may be acquired by accessing the terminal computer 101 on the spectacle store 100 side, the lens processing machine 241 on the factory 200 side, the shape measuring instrument 251 and the like, or these data may be acquired on the factory 200 side. It may be performed by accessing a database (not shown) provided for collective management.

As described above, the predicted shape specifying unit 201b is inevitable to generate tool interference during the beveling with the lens processing machine 241, and therefore, when performing the beveling based on the data acquired by the data acquiring unit 201a. The predicted finish shape of the bevel cross section considering the amount of machining tool interference is obtained. That is, the shape of the bevel cross section after thinning, distortion, or the like due to tool interference is obtained as a predicted finished shape. Details of how to obtain the predicted finished shape will be described later.

The contact mode specifying unit 201c is a shape for measuring the bevel circumference of the spectacle lens with respect to the bevel of the spectacle lens having the predicted finished shape obtained by the predicted shape specifying unit 201b based on the data acquired by the data acquiring unit 201a. It is determined how the stylus 251a of the measuring instrument 251 contacts. That is, the contact mode of the stylus 251a with the bevel of the predicted finished shape is obtained. The method for obtaining the contact mode of the stylus 251a will be described later in detail.

The theoretical shape specifying unit 201d is obtained by the shape measuring instrument 251 when the contact state of the stylus 251a obtained by the contact state specifying unit 201c is reflected on the spectacle lens having the finished predicted shape obtained by the predicted shape specifying unit 201b. The shape measurement result will be specified, and the shape measurement result is set as the theoretical three-dimensional shape (that is, the theoretical shape) of the peripheral edge of the spectacle lens after the beveling process. More specifically, based on the trajectory of the stylus 251a when the stylus 251a is moved in the lens circumferential direction while the stylus 251a is in contact with the bevel of the predicted finish shape, the theoretical shape of the spectacle lens having the predicted finish shape is shown. Try to ask. Since this theoretical shape is a shape that corresponds to the predicted finish of the bevel considering the amount of interference of the processing tool, the design lens periphery calculated without considering the amount of interference of the processing tool by executing the bevel processing design program The shape (hereinafter simply referred to as “design shape”) is different. The method for specifying the theoretical shape will be described later in detail.

The theoretical shape notifying means 201e notifies at least the terminal computer 250 about the theoretical shape specified by the theoretical shape specifying means 201d.

The theoretical shape acquisition unit 250a acquires the theoretical shape notified from the theoretical shape notification unit 201e of the main frame 201.

When the shape measuring device 251 measures the shape of the lens peripheral edge of the beveled spectacle lens, the actually measured shape obtaining unit 250b converts the three-dimensional shape (hereinafter simply referred to as “actually measured shape”) as a result of the measurement. Obtained from the measuring device 251.

The shape comparison means 250c compares the theoretical shape acquired by the theoretical shape acquisition means 250a with the actual measurement shape acquired by the actual measurement shape acquisition means 250b, and determines pass / fail of the beveled spectacle lens. In other words, the quality of the actually measured shape is determined for the spectacle lens in which the actually measured shape is measured by comparison with the theoretical shape, not the design shape. Details of the comparison between the theoretical shape and the actually measured shape and the quality determination based on the comparison result will be described later.

The determination result output means 250d outputs the result of the quality determination by the shape comparison means 250c to, for example, the terminal computer 240. The main frame 201 may be added to the output destination of the pass / fail judgment result.

The determination result acquisition unit 240a acquires the pass / fail determination result output from the determination result output unit 250d of the terminal computer 250.

The correction instructing unit 240b is a lens processing machine that performs beveling of the spectacle lens that has obtained the actually measured shape based on the pass / fail determination result acquired by the determination result acquiring unit 240a (that is, the comparison result between the actually measured shape and the theoretical shape). In 241, the machining amount is corrected by an amount corresponding to the difference between the actually measured shape and the theoretical shape. However, the correction instruction unit 240b is configured to cause the lens processing machine 241 to correct the processing amount only when the difference between the actually measured shape and the theoretical shape exceeds a preset allowable range. Details of how to correct the machining amount will be described later.

These means 201a to 201e, 250a to 250d, and 240a to 240b are distributed in the mainframe 201 and the terminal computers 240 and 250 as described above, but are not necessarily limited to such an arrangement. For example, the arrangement may be such that the arrangement is concentrated on the main frame 201, for example.

(Lens processing control program)
The means 201a to 201e, 250a to 250d, and 240a to 240b described above are realized by the mainframe 201 or the terminal computers 240 and 250 having a function as a computer device executing a lens processing control program. The lens processing control program is a predetermined program (for example, a beveling design program) as long as it is started by the main frame 201 or the terminal computers 240 and 250 (hereinafter simply referred to as “main frame 201 etc.”) as necessary. May be a part of the program, or may be different from the predetermined program. In any case, the lens processing control program is installed and used in a storage device accessible by the mainframe 201 or the like, but is provided through the public communication line network 300 connected to the mainframe 201 prior to the installation. Or may be provided by being stored in a storage medium readable by the main frame 201 or the like.

<3. Lens shape determination procedure>
Next, the procedure of the lens shape determination method performed in the eyeglass lens supply system having the above-described configuration will be described with a specific example.
FIG. 5 is a flowchart showing an outline of the procedure of the lens shape determination method according to the present invention. 6 to 7 are explanatory diagrams showing specific examples of specifying a predicted finished shape by the lens shape determination method according to the present invention. FIG. 8 is an explanatory diagram showing a specific example of specifying a theoretical shape by the lens shape determination method according to the present invention. Moreover, FIG. 9 is explanatory drawing which shows the specific example of planar view of the shape comparison by the lens shape determination method based on this invention.

(Outline of lens shape determination procedure)
As shown in FIG. 5, the lens shape determination includes a predicted shape specifying step (Step 1, step is hereinafter abbreviated as “S”), a contact mode specifying step (S 2), a theoretical shape specifying step (S 3), It is performed through a shape comparison step (S4) and a pass / fail judgment step (S5).
Hereinafter, each of these steps (S1 to S5) will be described in order.

(S1; predicted shape specifying step)
The predicted shape specifying step (S1) is a step performed by the predicted shape specifying means 201b, and is a step for obtaining a predicted shape of the bevel cross-section in consideration of the amount of processing tool interference when performing bevel processing on an unprocessed spectacle lens. In order to obtain the predicted finished shape, the predicted shape specifying unit 201b first sets measurement points at a plurality of locations in the circumferential direction of the spectacle lens. For example, the measurement points are set at 360 locations by dividing the circumferential direction of the spectacle lens by 1 °. Then, the predicted shape specifying unit 201b assumes a cross section parallel to the Z axis including the processing point at the periphery of the spectacle lens at each measurement point, and considers a change in the shape of the bevel on this cross section.

When considering the shape change of the bevel cross section, the predicted shape specifying means 201b pays attention to the processing point on the periphery of the spectacle lens of the assumed cross section at a certain measurement point. Then, based on the position of the tool machining trajectory corresponding to the point to be machined in the assumed cross section, using the tool machining trajectory of several to several tens of points before and after that, the design of the assumed cross section to which attention is focused on the bevel shape The amount of interference of the rotary grindstone tool 241a is obtained. In other words, based on the shape data of the rotary grindstone tool 241a and the three-dimensional machining trajectory data, a movement simulation of the rotary grindstone tool 241a with respect to a certain work point is performed, thereby cutting the work point (see FIG. That is, the amount of tool interference) is sequentially calculated, and the bevel shape after the shape change due to the tool interference in the assumed cross section is obtained while using the envelope of the cross section shape. The bevel shape after this shape change becomes a predicted finish shape of the bevel cross section.

As shown in FIG. 6, the predicted shape specifying unit 201b performs a simulation process for obtaining the predicted finished shape of the bevel cross section for every measurement point, as shown in FIG. The predicted finished shape of the bevel cross section differs for each measurement point because the amount of interference of the rotary grindstone tool 241a differs at each measurement point. In the figure, the shape indicated by the solid line is the predicted shape of the bevel cross section at each measurement point, and the shape indicated by the broken line is the bevel when no tool interference occurs (ie, design). Shape.

When the predicted finish shape of the bevel cross section at each measurement point is arranged along the circumferential direction of the spectacle lens, the bevel shape of the entire spectacle lens is reproduced as shown in FIG. That is, it is possible to accurately obtain the predicted finish shape of the bevel cross-section over the entire circumference of the spectacle lens.

(S2; contact mode specifying step)
The contact mode specifying step (S2) is a step performed by the contact mode specifying means 201c, and is a step of determining the contact mode of the stylus 251a with respect to the bevel of the predicted finished shape determined in the predicted shape specifying step (S1). In order to obtain the contact mode of the stylus 251a, the contact mode specifying unit 201c first recognizes the cross-sectional shape passing through the rotation axis of the stylus 251a based on the shape data of the stylus 251a. When the cross-sectional shape of the stylus 251a is recognized, the predicted finished shape is obtained as to how the stylus 251a contacts the bevel of the spectacle lens having the predicted finished shape obtained by the predicted shape specifying unit 201b. Obtain individually for each measurement point. The reason why each measurement point is obtained individually is that the predicted shape of the bevel is different at each measurement point, and the contact mode of the stylus 251a is also different at each measurement point.

In the shape measuring instrument 251, the stylus 251a is applied with a certain pressure toward the center of the spectacle lens to be measured. Therefore, as shown in FIG. 8, the stylus 251a having the V-shaped groove contact portion 251b always comes into contact with the bevel of the spectacle lens at two different points A1 and A2 in the contact portion 251b. By specifying the state in which the two points A1 and A2 are in contact, the contact mode specifying unit 201c determines the contact mode of the stylus 251a.

Specifically, the contact mode specifying means 201c obtains the contact mode of the stylus 251a by performing the following simulation process. First, the contact mode specifying unit 201c pays attention to an assumed cross section at a certain measurement point. Then, on the assumed cross section and on each assumed cross section at a plurality of measurement points before and after that, the cross-sectional shape of the stylus 251a corresponding to each assumed cross-section is made closer to the predicted finish shape of the bevel from a certain direction. Then, one of the cross-sectional shapes of the stylus 251a in each assumed cross section and one of the predicted beveled shapes in each assumed cross-section always come into contact at least at one point. At this time, if contact is made at one point on the upper side of the contact portion 251b of the stylus 251a, the contact state specifying means 201c moves the stylus 251a so as to shift the Z-direction coordinate of the stylus 251a upward. Further, if the contact is made at one point on the lower side of the contact portion 251b of the stylus 251a, the contact state specifying means 201c moves the stylus 251a so as to shift the Z-direction coordinate of the stylus 251a downward. Then, after being moved by a predetermined amount, the stylus 251a is again brought closer to the predicted finish shape of the bevel. The contact state specifying unit 201c repeats such processing until the stylus 251a comes into contact with the two points A1 and A2 with respect to the predicted finished shape of the bevel while gradually decreasing the movement amount of the stylus 251a. . Thereby, the state in which the stylus 251a is finally in contact with the two points A1 and A2 with respect to the predicted finish shape of the bevel, that is, the contact mode of the stylus 251a can be obtained.

The contact state specifying unit 201c performs such a simulation process for all the measurement points for which the bevel finish prediction shape is obtained, thereby individually obtaining the contact state of the stylus 251a at each measurement point. That is, in consideration of the shape change of the bevel due to the tool interference, the state in which the stylus 251a of the shape measuring device 251 is in contact with the bevel after the shape change is confirmed.

(S3; theoretical shape specifying step)
The theoretical shape specifying step (S3) is a step performed by the theoretical shape specifying means 201d, and a shape measurement result that will be obtained by the shape measuring instrument 251 when the contact mode obtained in the contact mode specifying step (S2) is reflected. Is obtained as a theoretical shape of the peripheral edge of the spectacle lens after beveling. The theoretical shape may be specified based on the locus of the stylus 251a when the stylus 251a is moved in the circumferential direction of the spectacle lens while the stylus 251a is in contact with the predicted finish of the bevel. Specifically, after grasping the contact mode of the stylus 251a at each measurement point obtained by the contact mode specifying unit 201c, the reference position of the stylus 251a at each measurement point in the contact mode (for example, the position of the rotation center axis). , The locus of the stylus 251a is specified. Then, once the trajectory of the stylus 251a is specified, by using the same method (algorithm) that the shape measuring instrument 251 calculates the bevel circumference, the three-dimensional shape of the lens periphery in the spectacle lens having the predicted finish shape, That is, the theoretical shape of the spectacle lens can be obtained. That is, the theoretical shape specifying unit 201d obtains the theoretical shape from the trajectory of the stylus 251a based on the processing contents of the predicted shape specifying unit 201b and the contact mode specifying unit 201c.

(S4: Shape comparison step)
The shape comparison step (S4) is a step performed by the shape comparison means 250c, and the actual shape actually obtained by the shape measuring instrument 251 with respect to the peripheral edge of the spectacle lens after beveling and the theoretical shape obtained in the theoretical shape specifying step (S3). Is a step of comparing The comparison result in the shape comparison step (S4) is used for pass / fail determination in a pass / fail determination step (S5) described later.

The comparison between the actually measured shape and the theoretical shape is performed according to the coordinate system of the mechanism unit included in the lens processing machine 241 that performs the bevel processing on the spectacle lens that has obtained the actually measured shape. The mechanical unit of the lens processing machine 241 includes a cylindrical coordinate system and an orthogonal coordinate system. For example, when the mechanical unit of the lens processing machine 241 is a cylindrical coordinate system, the cylindrical coordinate of R−θ−z is used. To do. Since the measured shape and the theoretical shape are both obtained from the movement trajectory of the stylus 251a, they can be expressed by numerical values in the cylindrical coordinate system. Specifically, first, both shapes are arranged on the same cylindrical coordinate while using the coordinate origin as a reference. This state is referred to as a “first state”. Thereafter, for example, trial and error are performed using a known least square method, and one shape is overlapped with the other shape so that a difference amount (displacement amount) between the positions where both shapes are arranged is minimized. This state is referred to as a “second state”. If the amount of movement of the shape from the first state to the second state is grasped, a specific amount of deviation between the actually measured shape and the theoretical shape can be recognized.
After that, by using at least one of the following different amount modes as a variable parameter and optimizing so that the overlapped shapes are matched, the processing used in the processing amount correction step (S9) described later A correction amount can be obtained.

For example, in the case of a cylindrical coordinate system, there are mainly the following three types of (A) to (C) as differences that may occur between the actually measured shape and the theoretical shape.
(B) A mode in which a positional difference (displacement) in the Z direction of the cylindrical coordinates occurs between the two shapes.
(B) A mode in which a positional device (displacement) in the rotation direction (θ direction) of the cylindrical coordinates occurs between the two shapes.
(C) A mode in which a positional difference (deviation) in the R direction of the cylindrical coordinates occurs between the two shapes. In this case, the following two factors can be considered.
(C-1) Deviation between the lens rotation center axis and the control signal for the distance between the machining tool axes.
(C-2) Deviation between registered tool diameter and actual tool diameter.

As described above, in the shape comparison step (S4), since the determination with respect to the actually measured shape is performed based on the comparison result with the theoretical shape, the shape between both shapes can be obtained in any of the above-described modes (a) to (c). It is possible to accurately recognize the presence or absence of a difference (displacement).
For example, as shown in FIG. 9B, consider a case where an actually measured shape (see the solid line in the figure) is compared with a design shape (see the two-dot chain line in the figure). In this case, since the design shape is calculated without considering the bevel thinning due to the interference of the processing tool, the design shape is different from the actually measured shape in which the occurrence of the bevel thinning is unavoidable. For this reason, it is difficult to superimpose the two shapes in comparison between the measured shape and the design shape (see, for example, part B in the figure), and as a result, it is difficult to recognize what kind of misalignment has occurred between the two shapes. There is a risk of becoming. In particular, with respect to the above-described aspect (b), it is difficult to determine the rotation direction by comparing both shapes, and the amount of rotation may be inaccurate.
On the other hand, for example, as shown in FIG. 9A, if the measured shape (see the solid line in the figure) is compared with the theoretical shape (see the broken line in the figure), the theoretical shape is a bevel due to machining tool interference. The shape is obtained by reflecting the contact mode of the stylus 251a with respect to the bevel cross-section while taking into account the shape change, so that both shapes are substantially the same shape. For this reason, if the measured shape is compared with the theoretical shape, the substantially same shape is overlapped (see, for example, part A in the figure), so that it is easy to overlap both shapes. It is possible to accurately recognize whether there is a misalignment. In particular, with respect to the above-described aspect (b), it is easy to determine the direction of rotation by comparing both shapes, and the amount of rotation can be accurately grasped.

That is, in the shape comparison step (S4), the actually measured shape is compared with the theoretical shape grasped as a reference instead of the design shape. This theoretical shape is obtained by reflecting the contact state of the stylus 251a of the shape measuring instrument 251 with respect to the bevel cross section while taking into account the shape change of the bevel due to the machining tool interference. Therefore, the theoretical shape is influenced by the occurrence of the machining tool interference. Has been reduced to a level that can be ignored. Therefore, in comparing the measured shape and the theoretical shape, the influence due to the malfunction of the lens processing machine 241 that is a factor that the lens peripheral portion is not processed according to the desired shape can be realized, and as a result, the above-described (i) to ( In any aspect of c), it is possible to accurately recognize the presence or absence of a difference (deviation) between the two shapes.

(S5; pass / fail judgment step)
The pass / fail judgment step (S5) is a step performed by the shape comparison means 250c, and the pass / fail judgment for the measured shape, that is, the measured shape is desired while using the comparison result between the measured shape and the theoretical shape in the shape comparison step (S4). In this step, it is determined whether or not the shape is correct.
The quality determination for the actually measured shape is performed by determining whether or not the difference amount (deviation amount) between the two shapes recognized through the comparison between the actually measured shape and the theoretical shape is within a preset allowable range. Specifically, it is conceivable to carry out such as determining that the product is acceptable if the amount of deviation between the actually measured shape and the theoretical shape is within an allowable range.

Regarding the recognition result of the deviation amount between the actually measured shape and the theoretical shape, different values may be considered at each measurement point set at a plurality of locations in the circumferential direction of the spectacle lens. In that case, it may be determined whether or not the representative values of the different values are within an allowable range. As the representative value, any one of a maximum value and an average value of each value can be cited.
On the other hand, it is conceivable that the allowable range is individually set for the above three modes (A) to (C). Specifically, if the amount of misalignment is 0.1 mm or less for the mode (A), the product is determined to be acceptable, and if the amount of misalignment is 1 ° or less for the mode (B), the product is determined to be acceptable. And about the aspect of (c), if the deviation | shift amount is 0.02 mm or less, it is considered that it determines with a pass product. The value that defines the allowable range is not particularly limited and may be set as appropriate.

<4. Procedure of eyeglass lens manufacturing method>
Next, a description will be given of a spectacle lens manufacturing procedure (including lens quality determination) performed using the result of the lens shape determination described above.
FIG. 10 is a flowchart showing an outline of the procedure of the spectacle lens manufacturing method according to the present invention.

(Outline of eyeglass lens manufacturing procedure)
The eyeglass lens manufacturing method described in the present embodiment includes a lens processing step (S6) and a post-processing shape measurement step (S7) in addition to the steps (S1 to S5) constituting the procedure of the lens shape determination method described above. Then, the spectacle lens is manufactured through the correction necessity determination step (S8) and the processing amount correction step (S9).
Among these, the lens processing step (S6) and the post-processing shape measurement step (S7) are performed prior to the shape comparison step (S4). If it precedes a shape comparison step (S4), you may perform a parallel process with a prediction shape specific step (S1), a contact mode specific step (S2), and a theoretical shape specific step (S3).
The correction necessity determination step (S8) and the machining amount correction step (S9) are performed after the shape comparison step (S4). If it is after the shape comparison step (S4), parallel processing with the pass / fail judgment step (S5) may be performed.

(S6: Lens processing step)
In the lens processing step (S6), the lens processing machine 241 performs edge processing and bevel processing of the spectacle lens.

(S7; post-processing shape measurement step)
In the post-processing shape measurement step (S7), the shape measuring instrument 251 measures the shape of the lens peripheral portion of the beveled spectacle lens after the bevel processing is performed in the lens processing step (S6). As a result, the shape measuring instrument 251 can obtain an actually measured shape of the beveled spectacle lens. That is, the measurement result of the shape measuring instrument 251 is sent from the shape measuring instrument 251 to the terminal computer 250 as the actual measurement shape of the beveled spectacle lens. Then, in the terminal computer 250, the measured shape and the theoretical shape are compared in the shape comparison step (S4).

After that, as a result of the comparison between the actually measured shape and the theoretical shape in the shape comparison step (S4), the difference amount (deviation amount) between the two shapes is within the allowable range. In the pass / fail judgment step (S5), the actually measured shape If it is determined that the spectacle lens is an acceptable product (ie, it is a non-defective product), the spectacle lens is sent to another processing step (for example, a paint mark step) as necessary (S5a). ). On the other hand, the spectacle lens determined to be a rejected product (that is, a defective product) is reprocessed if it can be corrected (S5b), and discarded if it cannot be corrected.

(S8; correction necessity determination step)
In the correction necessity determination step (S8), based on the comparison result between the actually measured shape and the theoretical shape in the shape comparison step (S4), the terminal computer 240 processes the lens processing machine 241 used in the lens processing step (S6). It is determined whether or not an amount correction is necessary. Similar to the pass / fail determination in the pass / fail determination step (S5), this determination may be performed based on whether or not the amount of deviation between the measured shape and the theoretical shape is within a preset allowable range. Specifically, if the amount of deviation between the actually measured shape and the theoretical shape is within the allowable range, the processing amount correction for the lens processing machine 241 is not necessary, but if the amount of deviation exceeds the allowable range, the lens is corrected. For example, it may be determined that the machining amount correction for the processing machine 241 should be performed.

The allowable range used as a reference in the correction necessity determination step (S8) may be the same as the allowable range used in the quality determination step (S5). However, they are not necessarily the same, and different from the pass / fail determination in the pass / fail determination step (S5) may be used. Specifically, it is conceivable that the allowable range used as a reference in the correction necessity determination step (S8) is set to be stricter (to a narrower range) than the allowable range used in the quality determination step (S5). It is done. In this way, the machining amount correction is performed before the deviation amount between the actually measured shape and the theoretical shape exceeds the acceptable range of the pass / fail judgment, and it can be avoided in advance that the rejected product is generated. It becomes like this.

The correction necessity determination step (S8) may be performed every time the comparison result in the shape comparison step (S4) is obtained (that is, every lens ordering job from the spectacle store 100 side). There is no need to perform the above process, and the process may be performed based on the statistical result of each job at a timing after processing a predetermined number of jobs. Specifically, statistics are taken as to whether or not the amount of deviation between the measured shape and the theoretical shape is within an allowable range over a plurality of jobs. A known technique may be used as a statistical processing method. If such statistical processing is used, in the correction necessity determination step (S8), it is possible to determine whether or not correction is necessary while eliminating abnormal values, and the accuracy of the determination result can be improved.

(S9: machining amount correction step)
In the machining amount correction step (S9), when it is determined in the correction necessity determination step (S8) that the machining amount correction is necessary, the terminal computer 240 determines the actual measurement shape based on the comparison result between the actual measurement shape and the theoretical shape. The lens processing machine 241 that performs the bevel processing of the obtained spectacle lens is caused to correct the processing amount by an amount corresponding to the difference between the actually measured shape and the theoretical shape. That is, for the actually measured shape of the beveled spectacle lens that is the processing result of the lens processing machine 241, a so-called feedback correction that eliminates the deviation amount after recognizing the deviation amount from the theoretical shape is performed. That is, the processing machine 241 performs the processing. Therefore, when the bevel processing of the spectacle lens is newly performed by the lens processing machine 241 after the processing amount correction step (S9), the bevel processed spectacle lens has no difference (shift) between the actually measured shape and the theoretical shape. Is equal to

However, the processing amount correction by the lens processing machine 241 performed in the processing amount correction step (S9) is performed only when it is determined that the processing amount correction is necessary in the correction necessity determination step (S8), that is, the actually measured shape and the theoretical shape. This is performed only when the amount of difference exceeds the allowable range set in advance. If it is determined in the correction necessity determination step (S8) that the machining amount correction is unnecessary, the processing is terminated without passing through the machining amount correction step (S9). Therefore, the machining amount correction is performed only when necessary, and the processing load on the terminal computer 240 or the like can be reduced as compared with, for example, the case where it is performed each time an actually measured shape is obtained.

The processing amount correction by the lens processing machine 241 may be performed mechanically (physically) or may be performed by software.
The machining amount correction performed mechanically includes the following. For example, when it is determined that the processing amount correction is necessary, at least one of the terminal computer 240 or the lens processing machine 241 indicates that the processing amount correction is necessary and the processing to be corrected through information display using a display, for example. The amount is notified to the operator of the lens processing machine 241. Upon receiving this notification, the operator of the lens processing machine 241 adjusts, for example, the axial position of the processing tool with respect to the bevel processing mechanism of the lens processing machine 241 or the machine of the holding shaft for the unprocessed lens. Adjustment work such as adjusting the origin of the general rotation direction (θ direction) is performed. By performing such adjustment work, the lens processing machine 241 after that work will mechanically (physically) correct the processing amount when performing a new beveling process.
Further, processing amount correction performed by software includes the following. For example, when it is determined that the machining amount correction is necessary, at least one of the main frame 201 or the terminal computer 240 recognizes that the machining amount correction is necessary and the machining amount to be corrected. The processing amount to be stored is stored and held. When the beveling is newly performed by the lens processing machine 241, the calculation of the three-dimensional processing trajectory data necessary for the beveling is performed by reflecting the stored processing amount as a correction value. Specifically, for example, the three-dimensional machining trajectory data is calculated by adding or subtracting the set value of the tool diameter by the correction value. The lens processing machine 241 that performs beveling based on the three-dimensional processing trajectory data by generating the three-dimensional processing trajectory data in consideration of such processing amount correction has a processing amount for performing the beveling processing. It will be corrected in software.

In addition, correction of the processing amount by the lens processing machine 241 is mainly performed in each of the modes of occurrence of the difference (deviation) between the actually measured shape and the theoretical shape, that is, each of the above-described modes (a) to (c). Depending on the situation, there are the following three aspects (d) to (f).
(D) A correction mode in which the Z-axis position of the processing tool or the Z-axis position of the unprocessed lens in the lens processing machine 241 is moved mechanically or by software. According to such a correction mode, for example, in the lens processing machine 241, at least one of the unprocessed lens rotation axis or the processing tool rotation axis is in a position shifted from the original position due to poor adjustment or due to aging. Thus, even when the deviation according to the above-described aspect (a) occurs, for the spectacle lens that newly performs beveling after the correction of the processing amount, the lens processing machine 241 that causes the deviation occurs. It becomes feasible to eliminate the problem and process the peripheral edge of the lens according to the desired shape after the beveling.
(E) A correction mode in which the holding shaft of the unprocessed lens in the lens processing machine 241 is moved mechanically or by software in the rotation direction (θ direction). According to such a correction mode, for example, the origin in the rotation direction (θ direction) of the holding jig blocked by the blocker with respect to the unprocessed lens and the mechanical rotation direction (θ direction) of the holding shaft of the lens processing machine 241. ) Even if there is a problem that the origin is shifted from the original position due to a machine adjustment error, etc. In the case of a spectacle lens that performs beveling, it is possible to eliminate the inconvenience that causes misalignment and to process the peripheral portion of the lens in a desired shape after beveling.
(F) Correction mode in which the axial position of the processing tool in the lens processing machine 241 is mechanically moved, or the tool diameter setting value of the processing tool is changed (corrected) in software. According to such a correction mode, for example, there is a setting error regarding the value of the tool diameter for the processing tool used in the lens processing machine 241, and the problem due to the above-mentioned factors (c-1) or (c-2) occurs. Even if the deviation due to the above-described aspect (c) may occur, this problem of the lens processing machine 241 that causes a deviation occurs for a spectacle lens that is newly beveled after the correction of the processing amount. It becomes feasible to eliminate the above and to process the peripheral portion of the lens in a desired shape after the beveling.

Through the processing amount correction step (S9) as described above, feedback correction to the lens processing machine 241 is performed even when the result of the beveling process is affected due to a defect in the lens processing machine 241. Therefore, after the correction, the beveling result according to the desired shape can be obtained.

<5. Effects of this embodiment>
According to the lens processing control device, the lens processing control program, the lens shape determination method, and the spectacle lens manufacturing method described in the present embodiment, the following effects can be obtained.

In the present embodiment, when a predicted finish shape of the bevel cross-section considering the amount of interference of the processing tool is obtained, the contact mode of the stylus 251a with the bevel of the spectacle lens having the predicted finish shape is determined, and the contact mode is reflected. The shape measurement result that would be obtained by the shape measuring instrument 251 is set as the theoretical shape of the peripheral edge of the spectacle lens after beveling, and the theoretical shape is compared with the actual measurement shape obtained by the shape measuring instrument 251, thereby the lens processing machine 241. The quality of the bevel processing result at is determined. Therefore, according to the present embodiment, when shape measurement is performed on a spectacle lens after beveling and a quality determination is performed on the result, a series of processing from the shape measurement to the quality determination is performed accurately and efficiently. Can be done.

This point will be described in further detail. In the present embodiment, a new concept of a spectacle lens theoretical shape that takes into account the amount of processing tool interference is introduced. As a result, in this embodiment, it is possible to reduce the influence due to the occurrence of the processing tool interference to the extent that the influence of the generation of the processing tool can be ignored in determining whether the bevel processing result is acceptable or not, which is another factor that prevents the lens periphery from being processed as desired. The effects of lens processing machine failures can be made obvious. In other words, it is possible to separate and process two factors that cause the lens periphery of the spectacle lens not to have the desired shape, that is, those caused by the processing tool interference and those caused by the malfunction of the lens processing machine. Thus, for example, even if a determination result that the lens periphery is not the desired shape is obtained by shape measurement, it can be determined whether the result is due to the above two factors, that is, inevitable or resolvable. Therefore, according to the present embodiment, when shape measurement is performed on a spectacle lens after beveling and a quality determination is performed on the result, a series of processes from the shape measurement to the quality determination can be accurately performed. become.

In addition, in the present embodiment, a series of processing from the above-described shape measurement to pass / fail judgment can be performed using the result of the bevel processing on the unprocessed lens. That is, in order to calibrate the lens processing machine 241, the lens processing machine 241 performs beveling on a test lens such as a flat lens that cannot cause processing tool interference, and the shape of the test lens after the beveling is measured. It is not necessary to measure the shape of the periphery of the lens using the device 251. Therefore, according to the present embodiment, when shape measurement is performed on a spectacle lens after beveling, and quality determination is performed on the result, a series of processes from shape measurement to quality determination are efficiently performed. To get.

In addition, in the present embodiment, in addition to obtaining the predicted shape of the bevel cross-section in consideration of the amount of machining tool interference, the contact mode of the stylus 251a with respect to the bevel is obtained, and the theoretical shape is identified while reflecting the result. I do. That is, the stylus 251a of the shape measuring instrument 251 that measures the shape of the beveled spectacle lens grasps how the stylus 251a actually contacts the bevel shape after the bevel shape is thinned or distorted due to tool interference. Above, the theoretical shape is specified based on the grasped contents. Therefore, the result of specifying the theoretical shape conforms to the result of shape measurement using the stylus 251a. Therefore, a series of steps from shape measurement to pass / fail judgment are made as compared with the case where the grasping result of the contact state of the stylus 251a is not used. Further improvement in processing accuracy can be achieved.

Further, in the present embodiment, a new concept that is not known in the art, that is, a theoretical shape of a spectacle lens that takes into account the amount of interference of the processing tool is introduced, and the theoretical shape is compared with the actually measured shape obtained by the shape measuring instrument 251. Based on the result, the processing amount correction corresponding to the difference amount (deviation amount) between the actually measured shape and the theoretical shape is performed on the lens processing machine 241 that performs the bevel processing of the spectacle lens that has obtained the actually measured shape. Make it. Therefore, for example, as a result of measuring the shape of the spectacle lens after the beveling process, if the lens peripheral portion of the spectacle lens is not as the desired shape, that is, the beveling process result is affected due to a defect in the lens processing machine 241. Even in the case where the error occurs, the feedback correction to the lens processing machine 241 is performed through the processing amount correction step (S9). Therefore, after the correction, the bevel processing result according to the desired shape is obtained. Be able to. That is, according to the present embodiment, it is possible to surely eliminate the cause that can be solved due to the malfunction of the lens processing machine 241 by performing the feedback correction.

In the present embodiment, the lens processing machine 241 is used only when the amount of difference (deviation amount) between the actually measured shape and the theoretical shape exceeds a preset allowable range as a result of the comparison between the actually measured shape and the theoretical shape. Causes the machining amount to be corrected. Therefore, according to the present embodiment, the machining amount correction is performed only when necessary, so that the processing load on the terminal computer 240 or the like can be reduced as compared with, for example, the case where the machining shape is obtained each time a measured shape is obtained. Moreover, as described in the present embodiment, when determining whether or not the machining amount needs to be corrected by taking statistics of a plurality of jobs, an improvement in the accuracy of the determination result can be expected.

Further, in this embodiment, when specifying the theoretical shape, measurement points are set at a plurality of locations in the circumferential direction of the spectacle lens, a predicted finished shape is obtained for each measurement point, and the contact mode of the stylus 251a is determined for each measurement point. Ask. That is, a predicted finished shape or the like is not obtained for all the circumferential positions of the spectacle lens, but a predicted finished shape or the like is obtained for each of a plurality of preset measurement points. And between each measurement point, an interpolation process is performed based on the result of each measurement point. Therefore, although depending on the number of measurement points set, it is possible to reduce the calculation processing load when specifying the theoretical shape compared to the case where the predicted finished shape or the like is obtained for all locations in the circumferential direction of the spectacle lens. it can.

<6. Modified example>
While embodiments of the present invention have been described above, the above disclosure is intended to illustrate exemplary embodiments of the present invention. That is, the technical scope of the present invention is not limited to the above exemplary embodiment.

For example, the bevel shape, the shape of the rotary grindstone tool 241a, the shape of the stylus 251a, and the like exemplified in the present embodiment are merely examples, and the present invention is applied in the same manner even in the case of other shapes. It is possible.

Further, for example, in the present embodiment, three modes (A) to (C) are given as examples of the generation mode (difference) between the actually measured shape and the theoretical shape, and the processing amount correction modes corresponding to these modes are ( The three embodiments (d) to (f) are given as examples, but these are merely examples. That is, the mode of occurrence of difference (displacement) and the mode of processing amount correction may be only one of the three modes or all of the three modes. Furthermore, even if the aspect is completely different from the illustrated three aspects, the present invention can be applied in exactly the same manner as in the case of the three aspects.

201 ... main frame, 201a ... data acquisition means, 201b ... predicted shape specification means, 201c ... contact mode specification means, 201d ... theoretical shape specification means, 201e ... theoretical shape notification means, 240 ... terminal computer, 240a ... determination result acquisition means , 240b ... correction instruction means, 241 ... lens processing machine, 241a ... rotary grindstone tool, 250 ... terminal computer, 250a ... theoretical shape acquisition means, 250b ... measured shape acquisition means, 250c ... shape comparison means, 250d ... determination result output means 251: Shape measuring instrument, 251a: Stylus

Claims (8)

1. A predicted shape specifying means for obtaining a predicted shape of the bevel cross-section in consideration of the amount of processing tool interference when performing beveling on an unprocessed spectacle lens;
   Contact mode specifying means for obtaining a contact mode of a probe of a lens shape measuring instrument with respect to a bevel of a spectacle lens having the finished predicted shape;
   A theoretical shape specifying means for setting the shape measurement result that would be obtained by the lens shape measuring instrument when reflecting the contact mode as the theoretical shape of the peripheral edge of the spectacle lens after beveling,
   A shape comparison means for comparing the actual shape actually obtained with the lens shape measuring instrument with respect to the peripheral edge of the spectacle lens after the bevel processing and the theoretical shape, and performing pass / fail judgment for the actual shape based on the comparison result;
   A lens processing control device comprising:
2. Based on the comparison result between the measured shape and the theoretical shape, the lens processing machine that performed the beveling of the spectacle lens that obtained the measured shape has an amount corresponding to the difference between the measured shape and the theoretical shape. The lens processing control device according to claim 1, further comprising correction instruction means for performing processing amount correction.
3. The correction instruction means causes the lens processing machine to correct a processing amount only when a difference amount between the measured shape and the theoretical shape exceeds a preset allowable range. The lens processing control device described.
4. The predicted shape specifying means obtains the predicted predicted shape for each measurement point set at a plurality of locations in the circumferential direction of the spectacle lens,
   4. The lens processing control device according to claim 1, wherein the contact mode specifying unit obtains a contact mode of the probe with respect to a bevel of the predicted finish shape for each measurement point. 5. .
5. Computer
   A predicted shape specifying means for obtaining a predicted shape of the bevel cross-section in consideration of the amount of processing tool interference when performing beveling on an unprocessed spectacle lens;
   Contact mode specifying means for obtaining a contact mode of a probe of a lens shape measuring instrument with respect to a bevel of a spectacle lens having the finished predicted shape;
   A theoretical shape specifying means for setting the shape measurement result that would be obtained by the lens shape measuring instrument when reflecting the contact mode as the theoretical shape of the peripheral edge of the spectacle lens after beveling,
   Compare the measured shape actually obtained by the lens shape measuring instrument with the lens shape measuring instrument for the peripheral edge of the spectacle lens after beveling, and function as a shape comparison means for judging pass / fail for the measured shape based on the comparison result. A lens processing control program.
6. The computer,
   Based on the comparison result between the measured shape and the theoretical shape, the lens processing machine that performed the beveling of the spectacle lens that obtained the measured shape has an amount corresponding to the difference between the measured shape and the theoretical shape. 6. The lens processing control program according to claim 5, wherein the lens processing control program functions as correction instruction means for performing processing amount correction.
7. A predicted shape specifying step for obtaining a finished predicted shape of the bevel cross section in consideration of the amount of interference of the processing tool when performing the bevel processing on an unprocessed spectacle lens;
   A contact mode specifying step for obtaining a contact mode of the probe of the lens shape measuring instrument with respect to the bevel of the spectacle lens having the finished predicted shape;
   A theoretical shape specifying step in which the shape measurement result that would be obtained by the lens shape measuring instrument when reflecting the contact mode is the theoretical shape of the peripheral edge of the spectacle lens after beveling,
   A shape comparison step for comparing the measured shape actually obtained with the lens shape measuring instrument with the lens shape measuring instrument with respect to the peripheral edge of the spectacle lens after the bevel processing, and using the comparison result for quality determination for the measured shape,
   A lens shape determination method comprising:
8. Based on the comparison result between the measured shape and the theoretical shape using the lens shape determination method according to claim 7, the measured shape and A spectacle lens manufacturing method comprising: a processing amount correction step of performing processing amount correction corresponding to an amount different from the theoretical shape.

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