JP6127531B2 - Eyeglass lens processing apparatus and groove digging trajectory calculation program - Google Patents

Description

  The present invention relates to a spectacle lens processing apparatus for processing a peripheral edge of a spectacle lens, and a grooving locus calculation program.

  Conventionally, a technique for forming a groove on the periphery of a spectacle lens has been proposed. For example, in the spectacle lens processing apparatus disclosed in Patent Document 1, the groove digging tool has a position where the edge thickness of the lens is divided at a certain ratio, or a position shifted from the edge position on the front surface of the lens by a certain amount to the rear surface side. Groove data for controlling the grooving is created so as to pass.

JP 2003-145400 A

  In the grooving process, a grooving tool in which the shape of the portion in contact with the lens is annular may be used. In this case, due to the influence of the relative angle of the grooving tool with respect to the lens and the processing tool diameter of the grooving tool, there may be a portion where the width of the groove actually formed becomes wider than the thickness of the grooving tool. In the prior art, it has been difficult to perform grooving while reducing the influence of the relative angle of the grooving tool and the diameter of the tool.

  The present invention provides a spectacle lens processing apparatus and a grooving locus calculation program for performing grooving more accurately by reducing the influence of the angle of the grooving tool with respect to the lens and the diameter of the processing tool diameter of the grooving tool. The purpose is to do.

An eyeglass lens processing apparatus according to a first aspect of the present invention includes a grooving tool whose shape of a portion in contact with a lens is an annular shape, and moves the grooving tool relative to the periphery of the lens. A spectacle lens processing apparatus for forming a groove on a peripheral edge of the lens, and of the pair of edges of the groove formed in the lens, the locus of the front side edge located on the front side of the lens Front side information acquisition means for acquiring the information of the rear surface side information acquisition means for acquiring the information of the locus of the rear side edge part located on the rear surface side of the lens among the pair of edges, and the lens When forming the front side edge, the front-side trajectory, which is the relative trajectory of the grooving tool with respect to the lens, is the relative angle of the grooving tool with respect to the lens, and the grooving tool For processing tool diameter A front-side lens trajectory calculating means for calculating the rear-surface side trajectory relative to the lens when forming the rear-side edge portion on the lens, the relative angle And the rear surface side locus trajectory calculating means for calculating based on the processing tool diameter and the rear face side locus calculated by the rear face side lens locus calculating means are calculated by the front side lens locus calculating means. In a portion located on the front side with respect to the front-side locus, replacement means is provided for replacing the rear-side locus with the front-side locus .
An eyeglass lens processing apparatus according to a second aspect of the present invention includes a grooving tool whose shape of a portion in contact with the lens is an annular shape, and moves the grooving tool relative to the periphery of the lens. A spectacle lens processing apparatus for forming a groove on a peripheral edge of the lens, and of the pair of edges of the groove formed in the lens, the locus of the front side edge located on the front side of the lens Front side information acquisition means for acquiring the information of the rear surface side information acquisition means for acquiring the information of the locus of the rear side edge part located on the rear surface side of the lens among the pair of edges, and the lens When forming the front side edge, the front-side trajectory, which is the relative trajectory of the grooving tool with respect to the lens, is the relative angle of the grooving tool with respect to the lens, and the grooving tool For processing tool diameter A front-side lens trajectory calculating means for calculating the rear-surface side trajectory relative to the lens when forming the rear-side edge portion on the lens, the relative angle And a rear surface side lens trajectory calculating means for calculating based on the processing tool diameter, wherein the front side lens trajectory calculating means is configured such that the grooving processing tool of the processing tool diameter is at the relative angle at the front side edge portion. Among the relative positions of the grooving tool with respect to the lens, the set of positions that contact the front side edge from the rearmost side with respect to the lens is calculated. A trajectory for the side is calculated. An eyeglass lens processing apparatus according to a third aspect of the present invention includes a grooving tool in which a shape of a portion in contact with the lens is an annular shape, and the grooving tool is moved relative to a peripheral edge of the lens. A spectacle lens processing apparatus for forming a groove on a peripheral edge of the lens, and of the pair of edges of the groove formed in the lens, the locus of the front side edge located on the front side of the lens Front side information acquisition means for acquiring the information of the rear surface side information acquisition means for acquiring the information of the locus of the rear side edge part located on the rear surface side of the lens among the pair of edges, and the lens When forming the front side edge, the front-side trajectory, which is the relative trajectory of the grooving tool with respect to the lens, is the relative angle of the grooving tool with respect to the lens, and the grooving tool For processing tool diameter A front-side lens trajectory calculating means for calculating the rear-surface side trajectory relative to the lens when forming the rear-side edge portion on the lens, the relative angle And a rear surface side lens trajectory calculating means for calculating based on the processing tool diameter, wherein the rear surface side lens trajectory calculating means is configured such that the grooving tool of the processing tool diameter is at the relative angle at the rear surface side edge portion. Among the relative positions of the grooving tool with respect to the lens, the rear surface is calculated by calculating a set of positions that are in contact with the lens from the front surface side to the rear surface side edge portion. A trajectory for the side is calculated.

According to a fourth aspect of the present invention, there is provided a program for calculating a trench trajectory relative to a periphery of a lens of a grooving tool in which a shape of a portion in contact with the lens is annular in order to form a groove on the periphery of the lens A digging trajectory calculation program executed by a calculation device that calculates a trajectory of movement, and is executed by a processor of the calculation device, so that, among a pair of edges of the groove formed in the lens, Front-side information acquisition step for acquiring information on the locus of the front side edge located on the front side of the lens, and information on the locus of the rear side edge located on the rear side of the lens among the pair of edges. A rear surface side information acquisition step for acquiring the front surface side trajectory, which is a relative trajectory of the grooving tool with respect to the lens when the front surface side edge is formed on the lens, A front side lens locus calculating step for calculating based on a relative angle of the grooving tool with respect to the lens and a processing tool diameter of the grooving tool, and when forming the rear side edge on the lens, the side for the trajectory after a relative trajectory of the grooving tool with respect to the lens, and the relative angle and the side lens locus calculation step after that calculated on the basis of the processing tool diameter, calculated by the rear surface side of the lens trajectory calculation step The rear-side locus is replaced with the front-side locus in a portion where the rear surface-side locus is positioned on the front side of the front-side locus calculated by the front-side lens locus calculating step. And a replacement step is executed by the calculation device.
According to a fifth aspect of the present invention, there is provided a program for calculating a trench trajectory relative to a periphery of a lens of a grooving tool in which a shape of a portion in contact with the lens is annular in order to form a groove on the periphery of the lens A digging trajectory calculation program executed by a calculation device that calculates a trajectory of movement, and is executed by a processor of the calculation device, so that, among a pair of edges of the groove formed in the lens, Front-side information acquisition step for acquiring information on the locus of the front side edge located on the front side of the lens, and information on the locus of the rear side edge located on the rear side of the lens among the pair of edges. A rear surface side information acquisition step for acquiring the front surface side trajectory, which is a relative trajectory of the grooving tool with respect to the lens when the front surface side edge is formed on the lens, A front-side lens locus calculating step for calculating based on a relative angle of the grooving tool with respect to the lens and a processing tool diameter of the grooving tool, wherein the grooving tool of the processing tool diameter is the relative Of the relative positions of the grooving tool with respect to the lens when contacting the front side edge at an angle, a set of positions that contact the front side edge from the rearmost side with respect to the lens. A front-side lens locus calculating step for calculating the front-side locus by calculating, and a relative locus of the grooving tool with respect to the lens when the rear-side edge is formed on the lens. The calculation apparatus is configured to execute a rear surface side lens locus calculation step of calculating a rear surface locus based on the relative angle and the processing tool diameter.

  According to the present invention, the spectacle lens processing apparatus can perform grooving more accurately by reducing the influence of the angle of the grooving tool with respect to the lens and the diameter of the grooving tool.

1 is a schematic configuration diagram of a processing mechanism of an eyeglass lens processing apparatus 1. FIG. 6 is a front view of a second lens processing unit 40. FIG. 1 is a block diagram showing an electrical configuration of a spectacle lens processing apparatus 1. It is a schematic diagram for demonstrating the influence which the relative angle of the grooving processing tool 442 with respect to the lens LE has on the width | variety of a groove | channel. It is a flowchart of the grooving locus | trajectory calculation process which the spectacle lens processing apparatus 1 performs. It is a figure which shows typically the relative positional relationship of the locus | trajectory of the groove | channel to be formed, and the grooving tool 442 on a three-dimensional coordinate. Is a schematic view showing a state of cutting the front edge of the groove X coordinate of the center C of the grooving tool 442 x _n, the Y-coordinate while the y _n. It is a schematic diagram which shows the state in which a groove | channel is formed in lens LE by the grooving processing tool 442 of thickness T. FIG. It is a schematic diagram which shows a mode that the edge of a groove | channel spreads rather than plan.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a spectacle lens processing apparatus (lens edger) 1 according to this embodiment includes a lens holding unit 10, a lens shape measurement unit 20, a first lens processing unit 30, and a second lens processing unit 40. Prepare mainly. The eyeglass lens processing apparatus 1 holds the lens LE between the two lens chuck shafts 16L and 16R of the lens holding unit 10. The spectacle lens processing apparatus 1 processes the lens LE by changing the relative positional relationship between the first lens processing unit 30 and the second lens processing unit 40 and the lens LE sandwiched between the lens chuck shafts 16L and 16R. To do.

  In the following description, the direction in which the inter-axis distance between the lens chuck shafts 16L and 16R and the first processing tool rotation shaft 32 of the first lens processing unit 30 varies is defined as the X direction. A direction in which the lens chuck shafts 16L and 16R extend is defined as a Z direction. The Y direction is substantially the vertical direction of the eyeglass lens processing apparatus 1. Further, the lower right side, the upper left side, the upper right side, and the lower left side in FIG. 1 are defined as the front side, the rear side, the right side, and the left side of the eyeglass lens processing apparatus 1, respectively.

<Lens holding part>
The lens holding unit 10 includes shafts 11 and 12, a Z-axis movement support base 13, and a carriage 15. The shaft 11 is fixed to a central portion in the front-rear direction of the base 2 in the spectacle lens processing apparatus 1. The shaft 12 is fixed to the left side of the front end of the base 2. The two shafts 11 and 12 both extend in the Z-axis direction (that is, the direction parallel to the lens chuck shafts 16L and 16R). The Z-axis movement support base 13 is supported by two shafts 11 and 12 so as to be movable in the Z-axis direction. The carriage 15 is mounted on the Z-axis movement support base 13.

  The carriage 15 includes a left arm 15L on the left side and a right arm 15R on the right side. The left arm 15L rotatably holds the lens chuck shaft 16L. The right arm 15R rotatably holds the lens chuck shaft 16R. The two lens chuck shafts 16L and 16R are located on the same axis. The right lens chuck shaft 16R is moved in the Z-axis direction by a clamping motor 161 mounted on the right arm 15R. The eyeglass lens processing apparatus 1 holds the lens LE between the two lens chuck shafts 16L and 16R by moving the right lens chuck shaft 16R to the left. The right arm 15R is provided with a lens rotation motor 162 that rotates the two lens chuck shafts 16L and 16R. When the lens rotation motor 162 rotates, the two lens chuck shafts 16L and 16R rotate around the shaft in synchronization.

  A Z-axis moving motor 171 is mounted near the left end of the shaft 11. A ball screw (not shown) extending in the Z-axis direction in parallel with the shaft 11 is provided at the rear portion of the Z-axis movement support base 13. When the Z-axis movement motor 171 rotates, the ball screw rotates. As a result, the Z-axis movement support base 13 and the carriage 15 linearly move in the Z-axis direction. The Z-axis moving motor 171 is provided with an encoder 172. The encoder 172 detects the movement of the carriage 15 in the Z direction by detecting the rotation of the Z-axis moving motor 171.

  A guide shaft 18 and a ball screw 19 are provided in parallel between the Z-axis movement support base 13 and the left arm 15L of the carriage 15. An X-axis movement motor 191 is provided in the vicinity of the front end of the Z-axis movement support base 13. When the X-axis moving motor 191 rotates, the ball screw 19 rotates. As a result, the carriage 15 rotates about the shaft 11. The eyeglass lens processing apparatus 1 changes the relative positional relationship between the first lens processing unit 30 and the second lens processing unit 40 and the lens LE sandwiched between the lens chuck shafts 16L and 16R by rotating the carriage 15. Let That is, the spectacle lens processing apparatus 1 drives the X-axis movement motor 191 to move the first lens processing unit 30 and the second lens processing unit 40 relative to the lens LE in the X direction. The eyeglass lens processing apparatus 1 may perform processing by moving the first lens processing unit 30 and the second lens processing unit 40. That is, the spectacle lens processing apparatus 1 should just be provided with the structure which moves the 1st lens processing unit 30 and the 2nd lens processing unit 40 relatively with respect to the lens LE. The X-axis moving motor 191 is provided with an encoder 192. The encoder 192 detects the movement of the carriage 15 in the X direction by detecting the rotation of the X-axis movement motor 191.

<Lens shape measurement unit>
The lens shape measurement unit 20 is provided behind the carriage 15. The lens shape measuring unit 20 includes a measuring element 21 that contacts the front surface of the lens LE and a measuring element 22 that contacts the rear surface of the lens LE. The measuring elements 21 and 22 are held by an arm 23 movable in the Z direction. The lens shape measurement unit 20 includes a sensor 231 (see FIG. 3) that detects the position of the arm in the Z direction. When measuring the lens shape, the spectacle lens processing apparatus 1 rotates the lens chuck shafts 16L and 16R and controls the movement of the lens chuck shafts 16L and 16R in the X direction based on the target lens shape. As a result, the position in the Z direction of the lens front surface and the rear surface corresponding to the target lens shape is detected by the sensor 231. In the eyeglass lens processing apparatus 1 according to the present embodiment, the lens shape is measured using the movement control in the Z direction of the lens chuck shafts 16L and 16R.

<First lens processing unit>
The first lens processing unit 30 is provided in front of the carriage 15. The first lens processing unit 30 includes a first processing tool 31, a first processing tool rotating shaft 32, and a first processing tool rotating motor 321. The first processing tool 31 includes a glass rough grindstone 311, a finishing grindstone 312, a flat mirror surface finishing grindstone 313, a plastic rough grindstone 314, and the like. The finishing grindstone 312 is formed with a V groove (bevel groove) VG for forming a bevel on the lens LE and a flat processed surface. The first processing tool rotating shaft 32 extends in the Z-axis direction, and fixes a plurality of substantially disk-shaped grindstones provided in the first processing tool 31 on the same axis. The first processing tool rotation motor 321 is connected to the right end portion of the first processing tool rotation shaft 32. When the first processing tool rotation motor 321 rotates, the first processing tool rotation shaft 32 and the first processing tool 31 rotate about the axis. The eyeglass lens processing apparatus 1 processes the peripheral edge of the lens LE by bringing the lens LE into contact with the first processing tool 31.

<Second lens processing unit>
The second lens processing unit 40 is provided behind the carriage 15. The second lens processing unit 40 is fixedly arranged side by side with the lens shape measurement unit 20 outside the movement range of the lens shape measurement unit 20.

  As shown in FIG. 2, the second lens processing unit 40 includes a support base block 41, a holding member 42, a second processing tool rotating shaft 43, a second processing tool 44, and a second processing tool rotating motor 431. The support base block 41 is fixed to the base 2 (see FIG. 1) and extends upward from the base 2. The holding member 42 is fixed to the upper end portion of the support base block 41 and holds the second processing tool rotating shaft 43 in a rotatable manner. The second processing tool 44 includes a chamfering grindstone 441 for the lens rear surface, a grooving processing tool 442, and a chamfering grindstone 443 for the lens front surface. In the present embodiment, the chamfering grindstones 441 and 443 and the grooving tool 442 are integrally formed, but may be formed separately.

  The maximum diameter of the chamfering grindstones 441 and 443 is smaller than the diameter of the grooving tool 442 (about 20 mm). The shape of the chamfering grindstones 441 and 443 is a tapered shape whose diameter decreases as the distance from the grooving tool 442 increases. The eyeglass lens processing apparatus 1 chamfers the lens LE by bringing the chamfering grindstones 441 and 443 into contact with the corners of the lens LE.

  Of the grooving tool 442, the shape of the portion that contacts the lens LE is annular. Accordingly, the eyeglass lens processing apparatus 1 can form grooves on the periphery of the lens by bringing the groove processing tool 442 into contact with the lens LE while rotating. In this embodiment, the grooving tool 442 is integral with the chamfering grindstones 441 and 443. However, a disk-like grooving tool 442 may be used alone. In the present embodiment, a grindstone is used as the grooving tool 442. However, the configuration of the grooving tool 442 may be changed. For example, a substantially disk-shaped or substantially annular cutter having teeth on the outer periphery may be used as the grooving tool 442. In the present embodiment, the processing tool diameter R of the grooving tool 442 (that is, the diameter of the outer peripheral portion of the annular grooving tool 442) is 19 mm. The thickness T of the processing part located at the outer peripheral end of the grooving tool 442 is 0.5 mm. Needless to say, the processing tool diameter R and thickness T of the grooving processing tool 442 can be changed.

  In the present embodiment, the axial direction of the second processing tool rotating shaft 43 is fixed. Specifically, as shown in FIG. 1, the axis S1 of the second processing tool rotating shaft 43 is inclined at a predetermined angle (15 degrees in the present embodiment) relative to the axis S2 of the lens chuck shafts 16L and 16R. ing. The relative angle of the grooving tool 442 with respect to the lens LE is determined by the angles of the two axial directions S1 and S2. Specifically, the relative angle between the plane to which the processing part of the annular grooving tool 442 belongs and the plane of the lens LE having a substantially plate shape coincides with the angles of the two axes S1 and S2. In the present embodiment, since the axial direction of the second processing tool rotating shaft 43 is fixed, the relative angle of the grooving processing tool 442 with respect to the lens LE and the lens chuck shafts 16L and 16R is constant. By omitting the mechanism for changing the axial direction of the second processing tool rotating shaft 43, the structure of the eyeglass lens processing apparatus 1 is simplified. Therefore, the size and cost of the device can be easily reduced. However, the present invention can be applied even when the axial direction of the second processing tool rotating shaft 43 is changed.

<Electrical configuration>
With reference to FIG. 3, the electrical configuration of the eyeglass lens processing apparatus 1 will be described. The spectacle lens processing apparatus 1 includes a CPU 5 that is a processor that controls the spectacle lens processing apparatus 1. A RAM 6, a ROM 7, a nonvolatile memory 8, an operation unit 50, a display 55, and an external communication I / F 59 are connected to the CPU 5 via a bus. Further, the CPU 5 includes various devices such as the motors described above (a clamping motor 161, a lens rotating motor 162, a Z-axis moving motor 171, an X-axis moving motor 191, a first processing tool rotating motor 321, a second processing tool. A tool rotation motor 431, an encoder 172, an encoder 192, and a sensor 231) are connected via a bus.

  The RAM 6 temporarily stores various information. The ROM 7 stores various programs, initial values, and the like. The non-volatile memory 73 is a readable / writable storage medium (for example, a flash ROM, a hard disk drive, etc.) that can retain stored contents even when power supply is interrupted. The non-volatile memory 73 stores a control program for controlling the operation of the eyeglass lens processing apparatus (for example, a groove digging locus calculation program for controlling the grooving locus calculating process shown in FIG. 5). The operation unit 50 is provided for receiving input of various instructions from the worker. For example, an operation button, a touch panel provided on the surface of the display 55, or the like can be used as the operation unit 50. The display 55 displays various information such as the shape of the lens LE and the shape of the frame. The external communication I / F 59 connects the eyeglass lens processing apparatus 1 to an external device.

  In this embodiment, the eyeglass lens processing apparatus 1 is connected to a frame shape measuring apparatus 60 (for example, one disclosed in Japanese Patent Laid-Open No. 4-93164). The frame shape measuring device 60 measures the shape of the frame. The eyeglass lens processing apparatus 1 acquires data indicating the shape of the frame from the frame shape measuring apparatus 60. The eyeglass lens processing apparatus 1 may acquire the frame shape data by another method. For example, the spectacle lens processing apparatus 1 may include a frame shape measuring unit that measures the shape of the frame. In this case, the eyeglass lens processing apparatus 1 may acquire the frame shape data by measuring the shape of the frame with the frame shape measuring unit. Moreover, the spectacle lens processing apparatus 1 may acquire frame shape data via a network such as the Internet. Frame shape data may be acquired from a personal computer (hereinafter referred to as “PC”) or the like. The frame shape data may be acquired by causing the operator to operate the operation unit 50 and causing the operator to input the shape of the frame.

<Description of phenomenon>
With reference to FIG. 4, the influence of the relative angle of the grooving tool 442 with respect to the lens LE on the groove width will be described. FIG. 4 is a diagram illustrating a state in which the grooving tool 442 forms a groove on the periphery of the lens LE. In order to facilitate understanding of the phenomenon, FIG. 4 shows a case where grooves are formed on the periphery of a rectangular lens. The two views shown on the upper side of FIG. 4 are XY plan views, and the two views shown on the lower side are XZ plan views. In the coordinate system of FIG. 4, the axis S2 of the lens chuck shafts 16L and 16R is parallel to the Z axis. The range in which the groove forming tool 442 and the lens LE are in contact with each other to form a groove is indicated by hatching. As described above, the axis S1 of the rotation shaft of the grooving tool 442 is inclined by θ degrees (15 degrees in this embodiment) with respect to the axis S2 of the lens chuck shafts 16L and 16R that rotate the lens LE. Therefore, when the outer shape of the grooving tool 442 is viewed in the XY plane, it looks like an ellipse instead of a circle. The eyeglass lens processing apparatus 1 performs grooving while rotating the lens LE about the axis S2.

  In the state shown on the left side of FIG. 4, a straight line passing through the center of the grooving tool 442 and perpendicular to the processed portion on the periphery of the lens LE is the center of the grooving tool 442 and the rotation center of the lens LE (axis S2 ) And a straight line passing through. In this case, as shown in the lower left side of FIG. 4, the width of the groove to be formed is substantially the same width d as the thickness T of the grooving tool 442 even when the axis S1 is inclined with respect to the axis S2. .

  On the other hand, in the state shown on the right side of FIG. 4, a straight line passing through the center of the grooving tool 442 and perpendicular to the workpiece of the lens LE is the center of the grooving tool 442 and the rotation center (axis line) of the lens LE. It is inclined with respect to the straight line passing through S2). In this case, as shown in the lower right side of FIG. 4, the substantially linear portion (the portion indicated by the oblique line) where the groove digging tool 442 and the lens LE are in contact is the direction in which the groove to be formed extends (see FIG. Tilt to the left and right direction. As a result, the width of the groove to be formed becomes a width D wider than the width d shown on the left side of FIG.

  As described above, when the axis S1 of the rotating shaft of the grooving tool 442 is inclined with respect to the axis S2 of the lens chuck shafts 16L and 16R, the width of the groove formed by one processing operation is the groove The digging tool 442 may be wider than the thickness T (specifically, the thickness in the Z-axis direction). When the processing tool diameter R of the grooving tool 442 is reduced, the spread of the groove is reduced. However, when the processing tool diameter R is reduced, interference between the members (for example, interference between the holding member 42 and the carriage 15 or the like) is likely to occur. As a result, it is difficult to freely design the internal layout of the eyeglass lens processing apparatus 1, and it is difficult to reduce the size of the apparatus. Further, even if the processing tool diameter R is reduced, the expansion of the width of the groove cannot be completely prevented. The spectacle lens processing apparatus 1 of the present embodiment has a relative angle of the grooving tool 442 with respect to the lens LE (hereinafter, also simply referred to as “relative angle of the grooving tool 442”) and the grooving tool 442. By reducing the influence of the processing tool diameter R, it is possible to perform grooving more accurately.

  Although the accuracy of the groove width can be improved by providing a mechanism for adjusting the angle of the axis S1 with respect to the axis S2, there is a case where sufficient adjustment cannot be performed only by this method. Therefore, the technique exemplified in this embodiment is particularly effective when the angles of the axes S1 and S2 (that is, the relative angle of the grooving tool 442) are fixed, but the angles of the axes S1 and S2 are adjusted. It is also effective when possible.

<Dugging locus calculation processing>
With reference to FIGS. 5 to 9, the grooving locus calculation process executed by the CPU 5 of the eyeglass lens processing apparatus 1 will be described. The grooving locus is a relative locus of the grooving tool 442 (in this embodiment, the center of the grooving tool 442) with respect to the periphery of the lens LE. The eyeglass lens processing apparatus 1 forms a groove on the periphery of the lens LE by moving the grooving tool 442 relative to the lens LE according to the calculated grooving locus. In the grooving trajectory calculation process, among the pair of front and rear edges in the groove to be formed, a grooving trajectory for forming an edge on the front side of the lens LE (hereinafter referred to as “front side edge”) A groove digging locus for forming a rear surface side edge of the lens LE (hereinafter referred to as “rear surface side edge”) is calculated separately.

  As described above, the non-volatile memory 8 of the eyeglass lens processing apparatus 1 stores a grooving locus calculation program for controlling the grooving locus calculation processing. When the CPU 5 inputs an instruction to execute the calculation of the grooving locus from the operation unit 50 or an external device, the CPU 5 executes the grooving locus calculation process shown in FIG. 5 according to the grooving locus calculation program.

  As shown in FIG. 5, when the groove digging trajectory calculation process is started, the position and shape of the groove to be formed on the periphery of the lens LE are set (S1). Various methods can be employed for setting the position and shape of the groove. As an example, in the present embodiment, the lens shape data of the lens LE is acquired from the shape of the rim of the frame measured by the frame shape measuring device 60 (see FIG. 3). By driving the lens shape measurement unit 20 based on the target lens shape data, the edge position of the lens LE is acquired. The position and shape of the groove are set so that the center in the width direction of the groove is located at a position where the edge thickness of the lens LE is divided at a certain ratio. In this embodiment, the width (0.6 mm) and the depth (0.3 mm) of the groove to be formed are both fixed values, but these can be changed as appropriate. In addition, CPU5 may set the position and shape of a groove | channel so that the front side edge position of lens LE may be followed. The position and shape of the groove may be set in accordance with the shape of the frame.

  Next, information on the trajectory of the front side edge in the groove to be formed and information on the trajectory of the rear side edge are obtained (S2, S3). The trajectory of the front side edge and the trajectory of the rear side edge are uniquely determined from the position and shape of the groove set in S1. The trajectory information is a parameter for specifying the shape and position of the trajectory in three dimensions. As an example, in this embodiment, the coordinate values (x, y, z) of 1000 points located on the locus of the front side edge are acquired as the locus information of the front side edge. Similarly, the coordinate values (x, y, z) of 1000 points located on the locus of the rear surface side edge are acquired as information on the locus of the rear surface side edge. In the present embodiment, the trajectory of the front side edge and the trajectory of the rear side edge match on the XY plane, and only the position in the Z direction is different.

FIG. 6 is a diagram schematically showing the relative positional relationship between the trajectory of the front side edge and the rear side edge to be formed and the grooving tool 442 in three dimensions. In the eyeglass lens processing apparatus 1 of the present embodiment, the Y coordinate of the center C of the grooving tool 442 is “0” and is fixed. However, in FIG. 6, for ease of understanding, the Y coordinate of the center C is assumed to be positive for convenience. The eyeglass lens processing apparatus 1 forms a groove in the lens LE by moving the center C (x ₀ , y ₀ , z ₀ ) of the grooving tool 442 relative to the periphery of the lens LE.

  Next, a known grindstone diameter correction process (see Japanese Patent Application Laid-Open No. 5-212661, etc.) is performed to calculate the locus on the XY plane of the center C of the grooving tool 442 (S4). More specifically, in the process of S4, the depth of the groove is taken into consideration, and the outer peripheral end portion of the grooving tool 442 is relatively moved along the groove forming portion of the lens LE. The locus of the center C on the plane is calculated. As described above, in this embodiment, the locus of the front side edge and the locus of the rear side edge coincide on the XY plane. Therefore, the locus of the center C on the XY plane calculated in S1 is used as a relative locus of the center C when forming the front side edge of the groove, and the center when forming the rear side edge. Also used as a relative trajectory for C.

Next, a relative three-dimensional trajectory (hereinafter referred to as “front trajectory for front side”) of the center C of the grooving tool 442 relative to the lens LE when forming the front side edge is calculated (S5). ). Since the locus of the center C of the XY plane is already calculated in S4, the value z ₀ of Z coordinates of the center C in the S5 is calculated. The trajectory for the front side includes a relative angle of the grooving tool 442 with respect to the lens LE (hereinafter sometimes simply referred to as “relative angle of the grooving tool 442”) and a processing tool diameter R of the grooving tool 442. Calculated by taking into account. As described above, the relative angle of the grooving tool 442 is determined by the angle θ between the two axes S1 and S2. Therefore, the CPU 5 of the present embodiment calculates the front-side locus using the angle θ.

  Hereinafter, an example of a method for calculating the front side locus will be described with reference to FIGS. 6 and 7. First, as shown in FIG. 6, in order to specify the processing tool plane P including the processing site of the grooving tool 442 (specifically, the center of the processing site in the thickness direction), the normal line of the processing tool plane P is specified. A vector is required. For example, a case where the axis S1 of the rotation axis of the grooving tool 442 is inclined by α degrees in the X direction and β degrees in the Y direction with respect to the axis S2 (that is, the Z direction) of the lens chuck shafts 16L and 16R. Suppose. In this case, a vector obtained by rotating the vector of Z = 1 by α degrees around the Y axis and β degrees around the X axis becomes the normal vector of the processing tool plane P. The normal vector is obtained by the following (Equation 1).

The processing tool plane P passes through the center C (x ₀ , y ₀ , z ₀ ) of the grooving tool 442. Therefore, the processing tool plane P is expressed by the following (Equation 2).

By transforming the above (Equation 2), (Equation 3) for obtaining the Z coordinate value z ₀ of the center C is obtained. (Equation 3) is calculated based on the relative angle of the grooving tool 442. Therefore, the CPU 5 can calculate the locus in consideration of the influence of the relative angle of the grooving tool 442 on the groove width by using (Equation 3). In the present embodiment, a grooving locus calculation program is set in advance so that the processing can be executed using (Equation 3). If the relative angle of the grooving tool 442 is changed, the values of α and β may be appropriately substituted into (Equation 3).

Next, by substituting the coordinates (x, y, z) of the point located on the front side edge to be formed into (Equation 3), the Z coordinate value z ₀ of the center C is calculated. As a result, a front side locus is calculated. In the present embodiment, the front-side locus is calculated by specifying 1000 positions of the center C on the front-side locus. Specifically, as shown in FIG. 7, n-th center _{C (x n, y n,} z n) when obtaining the _{z n} of, among the 1000 point located on the front side edge, the groove A plurality of points that overlap the digging tool 442 on the XY plane are identified as cuttable points. Here, the CPU 5 uses the diameter of the grooving tool 442 to identify a cutting possible point that overlaps the grooving tool 442 on the XY plane. Therefore, the locus can be calculated in consideration of the influence of the diameter of the grooving tool 442 on the groove width.

An example of a cutting point specifying algorithm will be described in detail. In this embodiment, when each point on the front side edge and the grooving tool 442 are both projected onto the XY plane, the point located inside the projection surface (elliptical) of the grooving tool 442 is , Identified as a cuttable point. Accordingly, a point on the front side edge where the values of x and y satisfy the following (Equation 4) is a cutting possible point. As described above, in this embodiment, Y-coordinate y _n of the center C of the grooving tool 442 is fixed at "0". R is the diameter of the grooving tool 442.

CPU5 the coordinates of each of the cuttable points identified (x, y, z) a by substituting the equation (3) above, to calculate the value z ₀ Z coordinate when cutting each cuttable points . In the example shown in FIG. 7, in a state where the X coordinate of the center C of the grooving tool 442 and x _n, the Y-coordinate and y _n, in order to cut a cuttable point K1 is grooving tool in FIG. 7 It is necessary to bring the left side of 442 into contact with the cuttable point K1. The value z ₀ of Z coordinates of the center C in this state can be calculated by substituting the coordinate of the cuttable points K1 (x, y, z) of the equation (3). Further, in order in a state where the X coordinate of the center C of the grooving tool 442 and x _n, the Y-coordinate and y _n, thereby cutting the cuttable points K2 is cut right grooving tool 442 in FIG. 7 It is necessary to contact the possible point K2. The value Z ₀ of the Z coordinate of the center C in this state can be calculated by substituting the coordinates (x, y, z) of the cuttable point K2 into (Equation 3). By executing the above processing for each of the possible cutting points, one or a plurality of values z ₀ are obtained.

Here, when a plurality of values z ₀ are obtained, it is necessary to specify one value z ₀ so that the front side edge portion does not spread more than expected. More specifically, the front side edge portion spreads more forward than planned except for the value z ₀ that positions the grooving tool 442 on the most rear surface side of the lens LE among the obtained plurality of values z ₀ . For example, in the example shown in FIG. 7, the eyeglass lens processing apparatus 1, the X coordinate of the center C x _n, that cutting the cuttable points K2 in the state in which the Y coordinate was y _n can be. However, together with the cuttable point K2, the front part of the front side edge to be formed is also cut at the same time. The same applies to cutting other possible cutting points other than K1 and K2. Therefore, CPU 5, among the plurality of values z ₀ found, grooving tool 442 lenses value z is located on the most rear side of the LE ₀ to _(in the example shown in FIG. 7, z ₀ highest _value) By specifying, the coordinates (x _n , y _n , z _n ) of the _nth center C are specified.

  The CPU 5 specifies a plurality (1000 in the present embodiment) of the positions of the centers C on the front side locus by the above method. A set of a plurality of specified positions is set as a locus for the front side of the grooving tool 442. In other words, the CPU 5 calculates a set of positions where the groove LE 442 comes in contact with the front side edge from the most rear side with respect to the lens LE. The side trajectory is calculated.

  Returning to the description of FIG. When the three-dimensional front side locus is calculated (S5), a three-dimensional rear side locus is calculated (S6). The rear surface locus is a relative locus of the groove digging tool 442 relative to the lens LE when the rear surface side edge of the groove is formed. The process of calculating the rear side locus is different from the process of S5 only in that the front-rear direction is reversed. That is, the CPU 5 calculates the locus for the rear surface side by substituting the coordinates (x, y, z) of the point located on the rear surface side edge to be formed into the above-described (Equation 3).

More specifically, n-th center _{C (x n, y n,} z n) when obtaining the _{z n} of, among 1000 points located on the rear side edge on, grooving tool 442 and the XY plane A plurality of points that overlap with each other are specified as cuttable points by (Equation 4). CPU5 the coordinates of each of the cuttable points identified (x, y, z) a by substituting the equation (3) above, the value z ₀ Z coordinate when cutting each cuttable points 1 or Calculate multiple. CPU5, as the rear side edge portion does not spread to the rear than the expected _(in the example shown in FIG. 7, the smallest z _{0 value)} the value z ₀ which is positioned foremost of the grooving tool 442 identifies the Thus, the coordinates (x _n , y _n , z _n ) of the n-th center C are specified. With the above method, a plurality of positions of the center C on the rear surface side locus are specified, and a set of the plurality of specified positions is set as the rear surface side locus. That is, the CPU 5 calculates a set of positions where the groove LE 442 comes in contact with the rear edge on the rear surface side by calculating a set of positions where the lens LE contacts the rear edge on the front surface from the front side most. The side trajectory is calculated.

Next, the front side trajectory and the rear side trajectory calculated in S5 and S6 are shifted in the Z direction based on the thickness T of the grooving tool 442 (S7). In S5 and S6 of this embodiment, the front-side locus and the rear-side locus are calculated on the assumption that the thickness T of the grooving tool 442 is “0”. In this case, as shown in FIG. 8, when the grooving tool 442 is relatively moved according to each of the front-side locus and the rear-side locus, the width of the groove that is actually formed is affected by the thickness T. , Wider than the groove width set in S1. Therefore, step S7 of the present embodiment is shifted only plus side (rear side) value distance S z ₀ of the front side for the trajectory, and the value of z ₀ of the rear side for trajectory distance S only negative ( Shifted to the front). The distance S is uniquely determined from the thickness T of the grooving tool 442. In this embodiment, “S = T / 2 cos θ”. In the process of S7, it is only necessary to shift at least one of the front-side locus and the rear-side locus so that the distance between the front-side locus and the rear-side locus becomes closer to 2S. Therefore, the distance for shifting each of the two trajectories can be changed as appropriate.

  Next, it is determined whether or not there exists a portion where the front and rear sides of the calculated front-side locus and the rear-side locus are reversed (S8). When the groove width does not increase due to the influence of the grooving tool 442, the front and rear of the two trajectories are not reversed. However, as illustrated in FIG. 9, when the widening of the groove becomes significant, there may be a portion where two trajectories move back and forth. In the example shown in FIG. 9, when the center C of the grooving tool 442 is relatively moved along the front-side locus 71 calculated in S <b> 5, the front-side edge portion that is actually formed is the expected front surface. It coincides with the side edge 80. However, in the upper right portion of the trajectory, there is a portion where the rear side edge portion that is actually formed extends rearward from the planned rear side edge portion 90. Further, when the center C of the grooving tool 442 is relatively moved along the rear surface side locus 72 calculated in S6, the rear surface side edge portion actually formed becomes the planned rear surface side edge portion 90. Match. However, in the upper right part of the trajectory, there is a portion where the front side edge portion that is actually formed spreads forward from the planned front side edge portion 80. In a region where the front and rear edge portions are widened, the rear surface side locus 72 is located on the front side of the front surface side locus 71, and the front and rear of the two tracks are reversed.

  If there is no portion where the front and rear of the two loci are reversed (S8: NO), the process proceeds to S10 as it is. If there is a portion where the front and rear of the two loci are reversed (S8: YES), the rear-side locus 72 in the reversed portion is replaced with the front-side locus 71, and a new rear-side locus 73 is set. (S9). That is, as shown on the right side of FIG. 9, in a portion other than the reverse portion, the grooving tool 442 is relatively moved in accordance with the rear surface side locus 72 calculated in S <b> 6, and the rear surface side edge portion 90 is formed. However, in the reverse rotation part, the grooving tool 442 is relatively moved according to the front side locus 71 calculated in S5, not the rear side locus 72 calculated in S6. As a result, in the reverse portion, the rear side edge portion that is actually formed spreads behind the planned rear side edge portion 90, but the groove does not spread forward than planned. Therefore, the spectacle lens processing apparatus 1 can more accurately form a groove in which the appearance from the front side of the lens LE is difficult to deteriorate.

  Next, grooving data for controlling the relative movement of the grooving tool 442 relative to the lens LE is created based on the front-side locus and the rear-side locus calculated in S1 to S9 (S10). . Specifically, grooving data for moving the relative position of the center C of the grooving tool 442 with respect to the lens LE along the front-side locus calculated in S5 is created. Further, grooving data for moving the relative position of the center C of the grooving tool 442 with respect to the lens LE along the rear surface locus calculated in S6 and S9 is created.

  When processing the groove, the spectacle lens processing apparatus 1 first relatively moves the grooving tool 442 at least one turn or more according to one of the front side grooving data and the rear side grooving data. Thereafter, the grooving tool 442 is relatively moved according to the other grooving data. As a result, a front side edge and a rear side edge are formed.

  As described above, the eyeglass lens processing apparatus 1 according to the present embodiment forms the front side edge portion based on the relative angle of the grooving tool 442 with respect to the lens LE and the processing tool diameter R of the grooving tool 442. The relative trajectory of the grooving tool 442 to the lens LE and the relative trajectory of the grooving tool 442 to the lens LE when forming the rear side edge are calculated separately. That is, in consideration of the relative angle of the grooving tool 442 and the processing tool diameter R, the grooving data for forming each of the front surface side edge portion and the rear surface side edge portion can be accurately created. Therefore, the spectacle lens processing apparatus 1 can perform the grooving more accurately by reducing the influence of the relative angle of the grooving processing tool 442 and the processing tool diameter R. That is, it can suppress that the width | variety of the groove | channel formed is fluctuate | varied.

  Depending on the relationship between the relative angle of the grooving tool 442, the tool tool diameter R, the thickness T, and the width of the groove to be formed, the rear side locus calculated in S6 may be the front side locus calculated in S5. The part located in the front side rather than may arise. In this part, since the groove is widened to the front side rather than the front side edge portion to be formed, the appearance of the glasses from the front side is deteriorated. The spectacle lens processing apparatus 1 of the present embodiment can prevent the groove from spreading to the front side rather than the front side edge to be formed by partially replacing the rear side locus with the front side locus. it can. Therefore, the spectacle lens processing apparatus 1 can more accurately form the groove in which the appearance of the spectacles is difficult to deteriorate.

  The eyeglass lens processing apparatus 1 according to the present embodiment is arranged such that the lens LE among the relative positions of the groove processing tool 442 with respect to the lens LE when the groove processing tool 442 contacts the front side edge to be formed. On the other hand, a front-side locus is calculated by calculating a set of positions on the most rear side. Of the relative positions of the grooving tool 442 with respect to the lens LE when the grooving tool 442 comes into contact with the edge on the rear surface side to be formed, the position on the frontmost side with respect to the lens LE By calculating the set, the rear surface side locus is calculated. Therefore, the spectacle lens processing apparatus 1 can accurately calculate the front-side locus and the rear-side locus in consideration of the relative angle of the grooving tool 442 and the processing tool diameter R.

  The spectacle lens processing apparatus 1 according to the present embodiment calculates each of the front side locus and the rear side locus based on the thickness T of the grooving tool 442. Therefore, the eyeglass lens processing apparatus 1 can calculate the front-side locus and the rear-side locus more accurately.

  Of course, the present invention is not limited to the above-described embodiment, and various modifications are possible. In the above embodiment, the eyeglass lens processing apparatus 1 calculates the groove digging locus, and forms a groove in the lens LE based on the calculated grooving locus. However, it is also possible to calculate the groove digging trajectory with an apparatus different from the spectacle lens processing apparatus 1. For example, the CPU of the PC may execute the ditching trajectory calculation program described in the above embodiment to calculate the ditching trajectory. In this case, the spectacle lens processing apparatus may drive each component based on the groove digging locus calculated by the PC to form the groove. As described above, the calculation device that calculates the grooving locus is not limited to the spectacle lens processing device 1. Needless to say, the present invention can be applied to both the case where a groove is formed on the entire periphery of the lens LE and the case where a groove is formed on a part of the periphery.

The specific calculation method of the front-side locus and the rear-side locus can be changed. For example, CPU 5 is in a state of fixing the x ₀ and y _0, gradually decreasing the value of z _0, determines the value of z ₀ when grooving tool 442 is in contact with the first front side edge Thus, the passing point of the center C on the front side locus may be calculated. Similarly, gradually increasing the value of z _0, by obtaining the value of z ₀ when grooving tool 442 is in contact with the first rear-side edge portion, the passage of the center C on the rear surface for side trajectory Points may be calculated. That is, the CPU 5 may calculate the front-side locus and the rear-side locus separately in consideration of the relative angle of the grooving tool 442 and the machining tool diameter R, and a detailed calculation method can be set as appropriate.

  In the above-described embodiment, the CPU 5 replaces the rear-side locus with the front-side locus in the reverse portion where the front-side locus calculated in S5 and the rear-side locus calculated in S6 are reversed. As a result, the groove is prevented from spreading to the front side of the schedule. However, the two trajectories calculated in S5 and S6 can be adopted as they are without preventing the groove from spreading to the front side. Even in this case, the CPU 5 can separately calculate the front-side locus and the rear-side locus in consideration of the relative angle of the grooving tool 442 and the machining tool diameter R. Therefore, the spectacle lens processing apparatus 1 can perform grooving more accurately than in the past.

  In the above embodiment, the CPU 5 shifts the calculated trajectory based on the thickness T after calculating the front trajectory and the rear trajectory without considering the thickness T of the grooving tool 442. However, the method of reflecting the thickness T in the locus is not limited to the method exemplified in the above embodiment. For example, the CPU 5 may reflect the thickness T when the locus is calculated in S5 and S6. More specifically, the CPU 5 may calculate the front-side locus so that the front-side end portion of the grooving tool 442 relatively moves along the front-side edge to be formed. Similarly, the rear surface side trajectory may be calculated so that the rear surface side end portion of the grooving tool 442 relatively moves along the rear surface side edge portion to be formed.

  In the above embodiment, the CPU 5 calculates the front side locus and the rear side locus separately, and then replaces the rear side locus with the front side locus at a portion where the front and rear of the two loci are reversed. As a result, the appearance of the glasses from the front side is prevented from deteriorating. However, the method for suppressing the expansion of the groove toward the front side can be changed. For example, the CPU 5 identifies a portion (an expanded portion) where the width of the groove formed by passing the grooving tool 442 relatively once is wider than the width of the groove to be formed. In the extended region, only the front side locus is calculated. For parts other than the extended part, the front side locus and the rear side locus are calculated separately. Even in this case, the spectacle lens processing apparatus 1 can suppress the spreading of the groove toward the front side. That is, when it is assumed that the CPU 5 relatively moves the grooving tool 442 along the rear side edge to be formed, the CPU 5 tries to form in a part where the front side edge extends to the front side than expected. What is necessary is just to calculate the locus | trajectory for rear surface sides so that the grooving processing tool 442 may be moved along the front side edge part to perform.

1 Eyeglass lens processing device 5 CPU
8 Non-volatile memory 162 Lens rotation motor 171 Z-axis movement motor 191 X-axis movement motor 442 Grooving tool LE Lens

Claims (5)

Eyeglasses comprising a groove digging tool in which the shape of the portion in contact with the lens is annular, and forming a groove on the periphery of the lens by moving the groove digging tool relative to the periphery of the lens A lens processing device,
Of the pair of edges of the groove formed in the lens, front side information acquisition means for acquiring information on the locus of the front side edge located on the front side of the lens;
Of the pair of edges, rear surface side information acquisition means for acquiring information on the locus of the rear surface side edge located on the rear surface side of the lens;
When forming the front side edge on the lens, the front side trajectory, which is the relative trajectory of the grooving tool with respect to the lens, is the relative angle of the grooving tool with respect to the lens, and the groove Front-side lens locus calculating means for calculating based on the processing tool diameter of the digging tool;
Rear surface side for calculating a rear surface side locus that is a relative locus of the grooving tool with respect to the lens when forming the rear surface side edge portion on the lens based on the relative angle and the processing tool diameter. Lens trajectory calculating means ;
The rear-surface-side locus calculated by the rear-surface-side lens locus calculator is located at the front side with respect to the front-surface-side locus calculated by the front-surface-side lens locus calculator. Replacement means for replacing a locus with the locus for the front side;
An eyeglass lens processing apparatus comprising: Eyeglasses comprising a groove digging tool in which the shape of the portion in contact with the lens is annular, and forming a groove on the periphery of the lens by moving the groove digging tool relative to the periphery of the lens A lens processing device,
Of the pair of edges of the groove formed in the lens, front side information acquisition means for acquiring information on the locus of the front side edge located on the front side of the lens;
Of the pair of edges, rear surface side information acquisition means for acquiring information on the locus of the rear surface side edge located on the rear surface side of the lens;
When forming the front side edge on the lens, the front side trajectory, which is the relative trajectory of the grooving tool with respect to the lens, is the relative angle of the grooving tool with respect to the lens, and the groove Front-side lens locus calculating means for calculating based on the processing tool diameter of the digging tool;
Rear surface side for calculating a rear surface side locus that is a relative locus of the grooving tool with respect to the lens when forming the rear surface side edge portion on the lens based on the relative angle and the processing tool diameter. Lens trajectory calculating means;
With
The front side lens trajectory calculating means includes a relative position of the grooving tool with respect to the lens when the grooving tool of the processing tool diameter contacts the front side edge at the relative angle. the from the most rear side of the lens by calculating a set of position in contact with the front side edge portion, an eyeglass lens processing apparatus you and calculates the front side for the trajectory. Eyeglasses comprising a groove digging tool in which the shape of the portion in contact with the lens is annular, and forming a groove on the periphery of the lens by moving the groove digging tool relative to the periphery of the lens A lens processing device,
Of the pair of edges of the groove formed in the lens, front side information acquisition means for acquiring information on the locus of the front side edge located on the front side of the lens;
Of the pair of edges, rear surface side information acquisition means for acquiring information on the locus of the rear surface side edge located on the rear surface side of the lens;
When forming the front side edge on the lens, the front side trajectory, which is the relative trajectory of the grooving tool with respect to the lens, is the relative angle of the grooving tool with respect to the lens, and the groove Front-side lens locus calculating means for calculating based on the processing tool diameter of the digging tool;
Rear surface side for calculating a rear surface side locus that is a relative locus of the grooving tool with respect to the lens when forming the rear surface side edge portion on the lens based on the relative angle and the processing tool diameter. Lens trajectory calculating means;
With
The rear surface side lens locus calculating means includes a relative position of the grooving tool with respect to the lens when the grooving tool of the processing tool diameter is in contact with the rear surface side edge at the relative angle. , most from the front side to calculate a set of position in contact with the rear side edge, the eyeglass lens processing apparatus you and calculates the rear surface side for the trajectory with respect to the lens. A groove that is executed by a calculation device that calculates a trajectory of relative movement of a grooved tool having a ring shape in the shape of a portion in contact with the lens with respect to the lens periphery in order to form a groove on the lens periphery. A digging trajectory calculation program,
By being executed by the processor of the calculation device,
Of the pair of edges of the groove formed in the lens, a front side information acquisition step of acquiring information on a locus of a front side edge located on the front side of the lens;
Of the pair of edges, a rear surface side information acquisition step of acquiring information on the trajectory of the rear surface side edge located on the rear surface side of the lens;
When forming the front side edge on the lens, the front side trajectory, which is the relative trajectory of the grooving tool with respect to the lens, is the relative angle of the grooving tool with respect to the lens, and the groove A front side lens locus calculating step for calculating based on the processing tool diameter of the digging tool;
Rear surface side for calculating a rear surface side locus that is a relative locus of the grooving tool with respect to the lens when forming the rear surface side edge portion on the lens based on the relative angle and the processing tool diameter. A lens locus calculation step;
The rear surface side locus calculated by the rear surface side lens locus calculation step is located at the front side with respect to the front surface side locus calculated by the front surface side lens locus calculation step. A replacement step of replacing a locus with the locus for the front side;
Grooving locus calculation program characterized by executing the calculation device. A groove that is executed by a calculation device that calculates a trajectory of relative movement of a grooved tool having a ring shape in the shape of a portion in contact with the lens with respect to the lens periphery in order to form a groove on the lens periphery. A digging trajectory calculation program,
By being executed by the processor of the calculation device,
Of the pair of edges of the groove formed in the lens, a front side information acquisition step of acquiring information on a locus of a front side edge located on the front side of the lens;
Of the pair of edges, a rear surface side information acquisition step of acquiring information on the trajectory of the rear surface side edge located on the rear surface side of the lens;
When forming the front side edge on the lens, the front side trajectory, which is the relative trajectory of the grooving tool with respect to the lens, is the relative angle of the grooving tool with respect to the lens, and the groove The front side lens locus calculating step for calculating based on the processing tool diameter of the digging tool, wherein the groove digging tool of the processing tool diameter contacts the front side edge at the relative angle. Of the relative position of the grooving tool with respect to the front surface side to calculate the locus for the front side by calculating a set of positions that contact the front side edge from the rearmost side with respect to the lens A lens locus calculation step;
Rear surface side for calculating a rear surface side locus that is a relative locus of the grooving tool with respect to the lens when forming the rear surface side edge portion on the lens based on the relative angle and the processing tool diameter. A lens locus calculation step ;
Is executed by the calculation device.