JP2017064865A - Spectacle lens machining device and machining control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spectacle lens machining device and a machining control program capable of appropriately forming a convex V-shape around a periphery of a lens.SOLUTION: A CPU of a spectacle lens machining device acquires shape information of a predetermined convex V-shape (S2). The convex V-shape comprises: a front surface facing a front side of a lens; a rear surface facing a rear side of the lens; and an outer periphery surface facing away from an optical axis of the lens. The CPU calculates a locus of a processing tool relative to the lens on the basis of the shape information for forming the front side surface around the periphery of the lens (S5). The CPU calculates a locus of the processing tool relative to the lens on the basis of the shape information for forming the rear side surface around the periphery of the lens (S6).SELECTED DRAWING: Figure 5

Description

  The present disclosure relates to a spectacle lens processing apparatus and a processing control program for processing a peripheral edge of a spectacle lens.

  Conventionally, a technique for forming a bevel around the periphery of a lens is known. For example, the spectacle lens processing apparatus described in Patent Document 1 includes a V-groove bevel grindstone that simultaneously processes a front-side bevel slope and a rear-side bevel slope. When a lens having a small curve is processed, the front-side bevel slope and the rear-side bevel slope are simultaneously processed by the V-groove bevel grindstone.

JP 2008-254078 A

  In some cases, it is desirable to form a convex bevel (sometimes referred to as “T bevel”) rather than a normal mountain-shaped bevel that forms a ridge portion by a front side slope and a rear side slope. The convex bevel has a front surface facing the front of the lens, a rear surface facing the rear of the lens, and an outer peripheral surface facing the outer peripheral side of the lens. The front surface and the rear surface may be formed substantially in parallel or may be formed inclined with respect to each other. When the convex bevel is formed, for example, when the curvature of the curve of the lens surface is small (that is, in the case of a high curve lens), the lens does not easily come off the frame.

  A typical object of the present disclosure is to provide a spectacle lens processing apparatus and a processing control program capable of appropriately forming a convex bevel around the periphery of a lens.

  An eyeglass lens processing apparatus provided by an exemplary embodiment of the present disclosure moves a relative position between a processing tool that processes the lens by contacting the lens and a peripheral edge of the lens. A spectacle lens processing apparatus capable of forming a bevel for fitting the lens to a frame on the periphery of the lens, the bevel to be formed on the periphery of the lens, and a front surface facing the front of the lens Shape information acquisition means for acquiring shape information specifying a shape of at least a portion of a convex bevel that is a bevel having a rear surface facing the rear of the lens and an outer peripheral surface facing away from the optical axis of the lens And a front surface trajectory that is a relative trajectory of the processing tool with respect to the lens when the front surface is formed on the periphery of the lens based on the shape information. Based on the shape information, a front surface trajectory calculating means to calculate and a rear surface trajectory that is a relative trajectory of the processing tool with respect to the lens when the rear surface is formed on the periphery of the lens. The convex bevel is formed on the lens by moving the relative position of the lens and the processing tool according to each of the rear surface trajectory calculating means and the front surface trajectory and the rear surface trajectory. Drive control means.

  A processing control program provided by an exemplary embodiment of the present disclosure includes a processing tool for processing the lens and a peripheral edge of the lens to form a bevel for fitting the lens on a spectacle frame on the peripheral edge of the lens. Is a processing program executed by a control device that controls relative movement of the lens, and is a bevel to be formed on the periphery of the lens by being executed by a processor of the control device. Acquire shape information that identifies at least a portion of the shape of a convex bevel that is a bevel having a front surface facing forward, a rear surface facing the rear of the lens, and an outer peripheral surface facing away from the optical axis of the lens. A shape information acquisition step, and a relative locus of the processing tool with respect to the lens when the front surface is formed on the periphery of the lens. A front surface trajectory calculating step for calculating a front surface trajectory based on the shape information, and a relative trajectory of the processing tool with respect to the lens when the rear surface is formed on the periphery of the lens. Causing the control device to execute a rear surface locus calculating step of calculating a rear surface locus based on the shape information.

  According to the eyeglass lens processing apparatus and the processing control program according to the present disclosure, a convex bevel is appropriately formed on the periphery of the lens.

1 is a schematic configuration diagram of a processing mechanism of an eyeglass lens processing apparatus 1. FIG. 3 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 fragmentary sectional view of lens LE in which convex bevel 70 was formed. It is a flowchart of the process control process which the spectacle lens processing apparatus 1 performs. It is a figure which shows the state in which the front slope 81 is formed by the front slope formation processing tool 311F. It is a figure which shows the state in which the back slope 82 is formed with the back slope formation processing tool 311B. It is a figure which shows the state in which the front surface 71 is formed of the annular | circular shaped processing tool 442. FIG. It is explanatory drawing for demonstrating the positional relationship of the annular | circular shaped processing tool 442 and the front surface 71. FIG. It is a figure which shows the state in which the rear surface 72 is formed with the annular | circular shaped processing tool 442. FIG.

  Hereinafter, one exemplary embodiment of the present disclosure will be described with reference to the drawings. As shown in FIG. 1, a spectacle lens processing apparatus (lens edger) 1 of 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. . 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 lens chuck shafts 16L and 16R extend is defined as the X direction. The direction in which the distance between the lens chuck shafts 16L, 16R and the rotation axis of the processing tool varies is defined as the Y direction. When the lens LE rotates around the lens chuck shafts 16L and 16R, the positional relationship between the lens LE and the processing tool in the Z direction changes. 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 of this embodiment includes shafts 11 and 12, an X-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 X-axis direction (that is, a direction parallel to the lens chuck shafts 16L and 16R). The X-axis movement support base 13 is supported by two shafts 11 and 12 so as to be movable in the X-axis direction. The carriage 15 is mounted on the X-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 X-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.

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

  A guide shaft 18 and a ball screw 19 are provided in parallel between the X-axis movement support base 13 and the left arm 15L of the carriage 15. Near the front end of the X-axis movement support base 13, a Y-axis movement motor 191 is provided. When the Y-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 Y-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 Y 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 only needs to have a configuration in which the first lens processing unit 30 and the second lens processing unit 40 are moved relative to the lens LE. The Y-axis moving motor 191 is provided with an encoder 192. The encoder 192 detects the movement of the carriage 15 in the Y direction by detecting the rotation of the Y-axis moving motor 191.

<Lens shape measurement unit>
The lens shape measurement unit 20 of this embodiment 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 X direction. The lens shape measurement unit 20 includes a sensor 231 (see FIG. 3) that detects the position of the arm in the X direction. When measuring the lens shape, the eyeglass 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 Y direction based on the target lens shape. As a result, the X-direction positions of the lens front surface and rear surface corresponding to the target lens shape are detected by the sensor 231.

<First lens processing unit>
The first lens processing unit 30 of this embodiment 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 plurality of processing tools including a slope forming processing tool (for example, a bevel grindstone) 311. The slope forming tool 311 includes a front slope forming tool 311F and a rear slope forming tool 311B. Each of the front slope forming processing tool 311F and the rear slope forming processing tool 311B has a processing surface that comes into contact with the lens LE while being inclined with respect to the edge surface. The front slope front slope forming processing tool 311 forms a front slope (for example, a front bevel slope) on the front side edge of the lens LE, which is inclined with respect to the edge surface of the lens LE. The rear slope forming processing tool 311B forms a rear slope (for example, a rear bevel slope or the like) that is inclined with respect to the edge surface at the rear side edge of the lens LE. In this embodiment, the front slope forming processing tool 311F and the rear slope forming processing tool 311B are integrally formed, but they may be separated. The first processing tool rotating shaft 32 extends in the X-axis direction, and fixes a plurality of substantially disk-shaped or substantially columnar processing tools included 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 periphery 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 of this embodiment is provided behind the carriage 15. The second lens processing unit 40 of the present embodiment is 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 of the present embodiment 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. Is provided. The support base block 41 extends upward from the base 2 (see FIG. 1). The holding member 42 is connected to the upper end portion of the support block 41 and holds the second processing tool rotating shaft 43 in a rotatable manner. The second processing tool 44 includes a chamfering tool (for example, a chamfering grindstone) 441 for the rear surface of the lens, an annular processing tool (grooving tool) 442, and a chamfering tool 443 for the lens front surface. In this embodiment, the chamfering tools 441 and 443 and the annular processing tool 442 are integrally formed, but may be formed separately.

  The maximum diameter of the chamfering tools 441 and 443 is smaller than the diameter of the grooving tool 442. The shape of the chamfering tools 441 and 443 is a tapered shape whose diameter decreases as the distance from the groove digging tool 442 increases. The eyeglass lens processing apparatus 1 can chamfer the lens LE by bringing the tapered processing surfaces of the chamfering processing tools 441 and 443 into contact with the corners of the lens LE.

  The shape of the portion of the annular processing tool 442 that contacts the lens LE is an annular shape. Therefore, the spectacle lens processing apparatus 1 can process the periphery of the lens LE by contacting the lens LE while rotating the annular processing tool 442 around the second processing tool rotating shaft 43. As an example, the annular processing tool 442 is used when a groove is formed on the periphery of the lens LE. Further, the annular processing tool 442 of this embodiment is also used when the convex bevel 70 is formed on the periphery of the lens LE. In the present embodiment, a grindstone is used as the annular processing tool 442. However, the configuration of the annular processing 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 annular processing tool 442.

  In the present embodiment, the axial direction of the second processing tool rotating shaft 43 is changed by the angle changing motor 432 (see FIG. 3). That is, as shown in FIG. 1, the relative angle between the axis S <b> 1 of the second processing tool rotating shaft 43 and the axis S <b> 2 of the lens chuck shafts 16 </ b> L and 16 </ b> R is changed by the angle changing motor 432. The relative angle of the second processing tool 44 (the annular processing tool 442 and the chamfering processing tools 441 and 443) with respect to the lens LE is determined by the angles of the two axial directions S1 and S2.

<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 (processor) 5 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, an X-axis moving motor 171, a Y-axis moving motor 191, a first processing tool rotating motor 321, a second processing tool. A tool rotation motor 431, an angle change motor 432, 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 8 is a non-transitory storage medium (for example, a flash ROM, a hard disk drive, etc.) that can retain stored contents even when power supply is interrupted. The nonvolatile memory 8 may store a control program for controlling the operation of the eyeglass lens processing apparatus 1 (for example, a processing control program for executing the processing control process shown in FIG. 5). The operation unit 50 receives input of various instructions from the worker. For example, a touch panel provided on the surface of the display 55, an operation button, or the like may be used as the operation unit 50. The display 55 can display 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.

  The eyeglass lens processing apparatus 1 of the present embodiment 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 may acquire 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 other methods. For example, the spectacle lens processing apparatus 1 may include a frame shape measuring unit that measures the shape of the frame. 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 user to operate the operation unit 50 and causing the user to input the shape of the frame.

<Convex bevel>
With reference to FIG. 4, an example of the shape of the convex bevel 70 that can be formed on the lens LE by the eyeglass lens processing apparatus 1 of the present embodiment will be described. The bevel fits into a groove or the like of the frame of the glasses, thereby fixing the lens LE to the frame. The convex bevel 70 has a front surface 71, a rear surface 72, and an outer peripheral surface 73. The front surface 71 is a surface facing the front of the lens LE. The rear surface 72 is a surface facing the rear of the lens LE. The outer peripheral surface 73 is a surface facing in a direction away from the optical axis OA of the lens LE (that is, a direction on the outer peripheral side of the lens). In the example shown in FIG. 4, a front bevel piece 78 is formed from the end of the front surface 71 on the optical axis OA side to the lens front surface 62. A rear bevel piece 79 is formed from the end of the rear surface 72 on the optical axis OA side to the lens rear surface 65. In this embodiment, the convex bevel 70 is formed by processing the front side edge 63 and the rear side edge 66 at the periphery of the lens LE with a processing tool. The convex bevel 70 does not necessarily have to be formed in the entire outer periphery of the lens LE, and may be formed in a part of the outer periphery.

  The front surface 71 and the rear surface 72 do not have to be strictly perpendicular to the optical axis OA. Similarly, the outer peripheral surface 73 does not have to be strictly perpendicular to the direction away from the optical axis OA. Moreover, in the example shown in FIG. 4, the front surface 71 and the back surface 72 are parallel. However, the front surface 71 and the rear surface 72 do not have to be parallel. For example, the angle between the front surface 71 and the rear surface 72 may be set so that the thickness of the convex bevel 70 (the width in the left-right direction in FIG. 4) increases as it approaches the optical axis OA. In this case, it may be easier to fit the lens LE to the frame than to make the front surface 71 and the rear surface 72 parallel.

<Machining control process>
A processing control process executed by the CPU 5 of the eyeglass lens processing apparatus 1 will be described with reference to FIGS. As described above, the non-volatile memory 8 stores a machining control program for executing the machining control process shown in FIG. When an instruction to execute the machining operation of the convex bevel 70 is input via the operation unit 50 or the like, the CPU 5 executes the machining control process shown in FIG. 5 according to the machining control program.

  First, the CPU 5 acquires shape information of the lens LE to be processed (S1). For example, in S1, 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 measuring unit 20 (see FIG. 1) based on the target lens shape data, the edge position of the lens LE is acquired as the shape information of the lens LE.

  Next, the CPU 5 acquires shape information of the convex bevel 70 formed on the periphery of the lens LE (S2). The shape information may be information that specifies at least a part of the shape of the convex bevel 70, and need not be information that accurately specifies the entire shape of the convex bevel 70. In addition, the shape information of the present embodiment includes information for specifying the position of the convex bevel 70 formed on the lens LE. As an example, in the present embodiment, the front slope outer peripheral ridge 91 (see FIG. 6), the rear slope outer peripheral ridge 92 (see FIG. 7), the bevel height H (see FIGS. 6 and 7), and the front surface reference Line (for example, the reference line 94 shown in FIG. 8 or the front surface outer peripheral side ridge 95), the front surface angle θ1 (see FIG. 8), the rear surface reference line (for example, the reference line 97 or the rear surface shown in FIG. 10). The outer peripheral side ridge portion 98 and the like) and the rear face angle θ2 (see FIG. 10) are acquired as shape information. Details of these will be described later. Note that the type of shape information acquired can be changed as appropriate. The shape and position of the convex bevel 70 may be determined according to the shape of the frame (for example, the shape of the groove of the frame) or may be input by the user via the operation unit 50 or the like.

  Next, the CPU 5 calculates a relative processing locus of the front slope forming processing tool 311F with respect to the front side edge portion 63 (see FIG. 4) of the lens LE (S3). In the present embodiment, in the process of forming the convex bevel 70, a front slope 81 that is inclined with respect to the edge surface 68 is formed on the front side edge 63 of the lens LE by the front slope forming processing tool 311F.

  With reference to FIG. 6, an example of a method for calculating the machining locus of the front slope forming processing tool 311F will be described. As described above, the front slope forming processing tool 311F has the processing surface 33 that is inclined with respect to the edge surface 68 of the lens LE. By processing the front side edge 63 (see FIG. 4) by the processing surface 33, the front slope 81 is formed on the front side edge 63. CPU5 calculates the process locus of front slope formation processing tool 311F so that the part which will form convex bevel 70 is not processed.

  More specifically, the CPU 5 of the present embodiment acquires the bevel height H that is one of the shape information. Based on the shape of the front slope forming processing tool 311F (for example, the angle of the processing surface 33 with respect to the lens LE and the diameter of the front slope forming processing tool 311F having a substantially cylindrical shape), the CPU 5 The machining locus of the front slope forming tool 311F is calculated so that the length in the vertical direction in FIG.

  In addition, the CPU 5 of the present embodiment is configured so that the position of the outer peripheral side ridge 91 of the front slope 81 is behind the reference line 94 that is the intersection line between the surface on which the front surface 71 is formed and the edge surface 68. A machining locus of the front slope forming tool 311F is calculated. In this case, the front chamfered surface 75 (see FIG. 4) is formed on the front side edge of the convex bevel 70 while the front slope 81 for reducing the processing time is formed. Details of this will be described later.

  In the present embodiment, the angle of the processing surface 33 of the front slope forming processing tool 311F with respect to the periphery of the lens LE is constant. However, the angle of the machining surface 33 may be changed. In this case, the CPU 5 may set the angle of the processed surface 33 when forming the front slope 81 so that the angle of the front chamfered surface 75 to be finally formed becomes an appropriate angle.

  Returning to the description of FIG. Next, the CPU 5 calculates a relative processing locus of the rear slope forming processing tool 311B with respect to the rear surface side edge portion 66 (see FIG. 4) of the lens LE (S4). In the present embodiment, in the process of forming the convex bevel 70, the rear slope forming tool 311B forms a rear slope 82 that is inclined with respect to the edge surface 68 on the rear side edge 66 of the lens LE.

  With reference to FIG. 7, an example of a method for calculating the machining locus of the rear slope forming processing tool 311B will be described. The rear slope forming processing tool 311B has a processing surface 34 that is inclined with respect to the edge surface 68 of the lens LE. By processing the rear surface side edge portion 66 (see FIG. 4) by the processing surface 34, the rear inclined surface 82 is formed on the rear surface side edge portion 66. The CPU 5 calculates the processing locus of the rear slope forming processing tool 311B so that the part scheduled to form the convex bevel 70 is not processed.

  More specifically, the CPU 5 of the present embodiment determines the rear slope 82 based on the shape of the rear slope forming tool 311B (for example, the angle of the processing surface 33 with respect to the lens LE and the diameter of the rear slope forming tool 311B). The processing locus of the rear slope forming processing tool 311B is calculated so that the length in the Y direction (vertical direction in FIG. 7) becomes the bevel height H.

  Further, in the CPU 5 of the present embodiment, the position of the outer peripheral side ridge portion 92 of the rear slope 82 is behind the reference line 97 that is the intersection line of the surface on which the rear surface 72 is formed and the edge surface 68 (see FIG. 6). The machining locus of the rear slope forming processing tool 311B is calculated so that In this case, a rear chamfered surface 76 (see FIG. 4) is formed at the rear side edge of the convex bevel 70 while the rear slope 82 is formed to shorten the machining time. Details of this will be described later. The CPU 5 may set the relative angle between the lens LE and the processed surface 34 so that the angle of the rear chamfered surface 76 is an appropriate angle.

  Returning to the description of FIG. Next, the CPU 5 determines the relative processing locus (front surface locus) of the annular processing tool 442 relative to the lens LE when forming the front surface 71 of the convex bevel 70 based on the shape information of the convex bevel 70. To calculate.

  With reference to FIG. 8 and FIG. 9, an example of a method for calculating the front surface locus will be described. The CPU 5 of the present embodiment calculates a front surface locus based on a front surface reference line extending in the circumferential direction of the lens LE along the surface forming the front surface 71. That is, the CPU 5 calculates the front surface locus so that the processing surface of the annular processing tool 442 moves relative to the lens LE while being in contact with the front surface reference line. The front plane reference line can be set as appropriate. For example, as shown in FIG. 8, a reference line 94 that is an intersection line between the surface on which the front surface 71 is formed and the edge surface 68 (see FIG. 6) may be used as the front surface reference line. Further, a ridge portion 95 (in this embodiment, a ridge portion formed by the front surface 71 and the front chamfered surface 75) located at the outer peripheral side end portion of the front surface 71 may be used as a front surface reference line. The front surface reference line may be set at a position closer to the optical axis OA of the lens LE than the ridge 95. Further, the CPU 5 may calculate the front surface trajectory so that the annular processing tool 442 simultaneously contacts a plurality of front surface reference lines. The front plane reference line may be specified as one line or may be specified by a set of a plurality of points.

  In addition, the CPU 5 of the present embodiment uses the lens LE and the annular processing tool 442 when the annular processing tool 442 is relatively moved according to the front surface trajectory based on the angle θ1 of the front surface 71 formed on the lens LE. A relative angle (hereinafter, simply referred to as “the angle of the annular processing tool 442”) is set. The CPU 5 calculates the front surface locus based on the set angle of the annular processing tool 442. A method of specifying the angle θ1 of the front surface 71 can be selected as appropriate. For example, the angle θ1 may be included in the shape information acquired in S1. Further, the CPU 5 may specify the angle θ1 from the positions of at least two points on the front surface 71.

  Further, the CPU 5 of the present embodiment calculates the front surface locus based on the height H (see FIGS. 6 and 7) of the convex bevel 70 formed on the lens LE. As a result, a convex bevel 70 having an appropriate height is formed on the lens LE.

Further, the CPU 5 according to the present embodiment has the front of the lens LE from the front side among the relative positions of the annular processing tool 442 with respect to the lens LE when the annular processing tool 442 contacts the front surface 71. A set of positions in contact with the direction 71 is calculated as a front surface locus. For example, in the example shown in FIG. 9, the eyeglass lens processing apparatus 1 processes the point K1 on the front surface reference line in a state where the coordinates of the center C of the annular processing tool 442 are (X1, y _n , Z _n ). It is possible to do. However, along with the point K1, the portion behind the front surface reference line is also processed at the same time. Accordingly, the CPU 5 positions the annular processing tool 442 in contact with the front surface reference line from the frontmost side with respect to the lens LE (in FIG. 9, the coordinates of the center C are (X2, y _n , Z _n )). Is calculated as a locus for the front surface.

  Returning to the description of FIG. Next, the CPU 5 uses the relative processing locus (trajectory for the rear surface) of the annular processing tool 442 with respect to the lens LE when forming the rear surface 72 of the convex bevel 70 based on the shape information of the convex bevel 70. To calculate.

  With reference to FIG. 10, an example of a method for calculating the locus for the rear surface will be described. A method similar to the method for calculating the front surface trajectory may be employed as the method for calculating the rear surface trajectory. For example, the CPU 5 of the present embodiment calculates the rear surface locus based on the rear surface reference line extending in the circumferential direction of the lens LE along the surface forming the rear surface 72. That is, the CPU 5 calculates the rear surface locus so that the processing surface of the annular processing tool 442 moves relative to the lens LE while being in contact with the rear surface reference line. The rear surface reference line can be appropriately set similarly to the front surface reference line. For example, as shown in FIG. 10, a reference line 97 that is an intersection line of the surface on which the rear surface 72 is formed and the edge surface 68 (see FIG. 6) may be used as the rear surface reference line. Further, a ridge portion 98 (in this embodiment, a ridge portion formed by the rear surface 72 and the rear chamfered surface 76) located at the outer peripheral side end portion of the rear surface 72 may be used as the rear surface reference line. The CPU 5 may calculate a rear surface locus based on a plurality of rear surface reference lines.

  In addition, the CPU 5 of the present embodiment uses the lens LE and the annular processing tool 442 when the annular processing tool 442 is relatively moved according to the rear surface trajectory based on the angle θ2 of the rear surface 72 formed on the lens LE. Set the relative angle. The CPU 5 calculates a rear surface locus based on the set angle of the annular processing tool 442. As described above, the angle θ1 of the front surface 71 and the angle θ2 of the rear surface 72 need not be the same. Further, the CPU 5 of the present embodiment calculates the rear surface locus based on the height H of the convex bevel 70 formed on the lens LE. Furthermore, the CPU 5 according to the present embodiment has the rear position from the rearmost side with respect to the lens LE among the relative positions of the annular processing tool 442 with respect to the lens LE when the annular processing tool 442 contacts the rear surface 72. A set of positions in contact with the direction 72 is calculated as a rear surface locus. The difference between this calculation method and the calculation method of the locus for the front surface described with reference to FIG. 9 is only that the front-rear direction is reversed.

  Returning to the description of FIG. The CPU 5 controls the movement of the relative positions of the slope forming tool 311 and the lens LE based on the processing locus calculated in S3 and S4 (S10). As a result, as shown in FIGS. 6 and 7, a front slope 81 and a rear slope 82 are formed on the periphery of the lens LE.

  Next, the CPU 5 forms the front surface 71 of the convex bevel 70 by moving the relative positions of the lens LE and the annular processing tool 442 according to the front surface locus calculated in S5 (see FIG. 8). ). Further, the CPU 5 forms the rear surface 72 of the convex bevel 70 by moving the relative positions of the lens LE and the annular processing tool 442 in accordance with the rear surface trajectory calculated in S6 (see FIG. 10). ). As a result, the convex bevel 70 specified by the shape information acquired in S2 is formed on the periphery of the lens LE (S11).

  In S <b> 11, the CPU 5 moves the relative positions of the lens LE and the annular processing tool 442 while controlling the angle of the annular processing tool 442 by the angle changing motor 432. As a result, the front surface 71 and the rear surface 72 with appropriate angles are formed.

  The chamfered surfaces 75 and 76 formed on the convex bevel 70 will be described. In this embodiment, as shown in FIG. 6 and FIG. 7, the distance between the outer peripheral ridges (ends) 91, 92 on the front slope 81 and the rear slope 82 is the front face 71 and the rear face of the convex bevel 70. 72 is shorter than the distance between the outer peripheral end portions (for example, outer peripheral ridges 95 and 98). Specifically, as shown in FIG. 6, the outer peripheral ridge 91 of the front slope 81 is formed behind the surface on which the front surface 71 is formed. Further, as shown in FIG. 7, the outer peripheral ridge 92 of the rear slope 82 is formed in front of the surface on which the rear surface 72 is formed. That is, in the X-axis direction (the thickness direction of the lens LE), the positions of the outer peripheral side ridges 91 and 92 of the two inclined surfaces 81 and 82 are the surface where the front surface 71 is extended and the surface where the rear surface 72 is extended. Located between. In this case, the chamfered surfaces 75 and 76 of the convex bevel 70 are formed on the slopes 81 and 82 by forming the front surface 71 and the rear surface 72 of the convex bevel 70 at the outer peripheral side end portions (see FIG. 4).

  As described above, the eyeglass lens processing apparatus 1 according to the present embodiment acquires shape information specifying at least a part of the shape of the convex bevel 70, and based on the acquired shape information, the processing tool for the lens LE. Relative trajectory (hereinafter referred to as “machining trajectory”). Here, the eyeglass lens processing apparatus 1 according to the present embodiment separately calculates a processing locus when the front surface 71 of the convex bevel 70 is formed and a processing locus when the rear surface 72 is formed. The spectacle lens processing apparatus 1 forms the front surface 71 and the rear surface 72 of the convex bevel 70 separately by controlling the driving of the processing tool according to the calculated processing locus. Therefore, the spectacle lens processing apparatus 1 according to the present embodiment can appropriately form the convex bevel 70 around the periphery of the lens LE.

  In addition, the method of forming the convex bevel 70 using the processing tool which has a groove | channel is also considered. In the processing tool used in this case, the shape of the groove when viewed in a cross section including the rotation axis is concave. When a processing tool having a groove is used, the front surface 71 and the rear surface 72 are formed at the same time, but the convex bevel 70 having a desired shape may not be formed. For example, when the angle between the processing tool having a groove and the peripheral edge of the lens LE changes, the width of the convex bevel 70 (for example, the distance between the front surface 71 and the rear surface 72) may change. Moreover, when using the processing tool which has a groove | channel, it is also difficult to set the width | variety of the convex bevel 70 to form freely. On the other hand, according to the technique exemplified in the present embodiment, the convex bevel 70 having an appropriate shape is formed. For example, it can be suppressed that the width of the convex bevel 70 is partially narrowed. It is also easy to set the width of the convex bevel 70 freely.

  The spectacle lens processing apparatus 1 according to the present embodiment calculates a front surface locus by calculating a set of positions of processing tools that contact the front surface 71 of the convex bevel 70 from the frontmost side with respect to the lens LE. . Therefore, the front surface 71 of the convex bevel 70 is formed more accurately. Moreover, the spectacle lens processing apparatus 1 of this embodiment calculates the locus | trajectory for back surfaces by calculating the position of the processing tool which contacts the back surface 72 of the convex bevel 70 from the backmost side with respect to the lens LE. . Therefore, the rear surface 72 of the convex bevel 70 is formed more accurately.

  In the eyeglass lens processing apparatus 1 of the present embodiment, each of the front surface 71 and the rear surface 72 of the convex bevel 70 is separately formed by an annular processing tool 442 whose shape in contact with the lens LE is an annular shape. . Therefore, the spectacle lens processing apparatus 1 according to the present embodiment can form the convex bevel 70 more freely as compared with the case where a processing tool having a groove is used. In addition, for example, a disc grindstone (for example, a grooving grindstone 442 in this embodiment) for forming a groove on the periphery of the lens LE can be used when the convex bevel 70 is formed.

  The eyeglass lens processing apparatus 1 according to the present embodiment includes an angle changing motor 432 that changes the angle of the annular processing tool 442 with respect to the periphery of the lens LE. The spectacle lens processing apparatus 1 calculates each of the front surface trajectory and the rear surface trajectory in consideration of the angle of the annular processing tool 442, and the relative position between the lens LE and the annular processing tool 442, and the circular shape processing tool 442. The angle of the annular processing tool 442 is controlled together. Therefore, the spectacle lens processing apparatus 1 according to the present embodiment can form the convex bevel 70 in which the angle of the front surface 71 and the angle of the rear surface 72 are more appropriate on the lens LE.

  In the eyeglass lens processing apparatus 1 according to the present embodiment, after the inclined surfaces 81 and 82 are formed on the lens LE by the inclined surface forming tool 311, the convex bevel 70 is applied to the lens LE according to each of the front surface locus and the rear surface locus. Form. Therefore, the eyeglass lens processing apparatus 1 according to the present embodiment can perform processing in a shorter time compared to the case where the convex bevel 70 is formed without going through the process of forming the slopes 81 and 82.

  The spectacle lens processing apparatus 1 according to the present embodiment is configured so that the distance between the outer peripheral side end portions 91 and 92 of the front slope 81 formed on the front side edge 63 and the rear slope 82 formed on the rear side edge 66 is a convex bevel. The distance between the outer peripheral side ends of the front surface 71 and the rear surface 72 of 70 is set shorter. In this case, the front surface 71 and the rear surface 72 of the convex bevel 70 are formed on the front surface side and the rear surface side slopes 81 and 82 formed by the slope forming tool 311 on the outer peripheral side end. After that, the chamfered surfaces 75 and 76 of the front side edge and the rear side edge of the convex bevel 70 remain. Therefore, the spectacle lens processing apparatus 1 according to the present embodiment can efficiently form the chamfered convex bevel 70 on the lens LE. If chamfering is performed on the convex bevel 70, for example, the lens LE is easily fitted to the frame.

  The technology disclosed in the above embodiment is merely an example. Therefore, it is possible to change the technique exemplified in the above embodiment. For example, in the above embodiment, the eyeglass lens processing apparatus 1 calculates a processing locus, and processes the lens LE based on the calculated processing locus. That is, in the above-described embodiment, the eyeglass lens processing apparatus 1 also serves as a control device that calculates a processing locus. However, an apparatus different from the eyeglass lens processing apparatus 1 can function as a control apparatus. For example, the CPU of the PC may calculate at least a part of the processing exemplified in the above embodiment and calculate the machining locus. In this case, the eyeglass lens processing apparatus 1 may process the lens LE by controlling the driving of each unit based on the processing locus calculated by the PC. A plurality of devices may function as the control device.

  In the above embodiment, the processing locus for forming the front slope 81 and the processing locus for forming the rear slope 82 are calculated separately at the edge of the lens LE. However, these trajectories need not be calculated separately. Moreover, in the said embodiment, the formation operation of the front slope 81 by the front slope formation processing tool 311F and the formation operation of the back slope 82 by the back slope formation processing tool 311B are performed separately. However, the front slope 81 and the rear slope 82 may be formed simultaneously. For example, the front slope 81 and the rear slope 82 may be simultaneously formed by a slope forming tool having a V groove on the machining surface (for example, a bevel grindstone having a V groove).

  In the above embodiment, the front surface 71 and the rear surface 72 of the convex bevel 70 are formed with respect to the lens LE having the slopes 81 and 82 formed at the edge. However, the spectacle lens processing apparatus 1 can also form the front surface 71 and the rear surface 72 of the convex bevel 70 without forming the slopes 81 and 82 on the lens LE. In this case, for example, the types of processing tools necessary for forming the convex bevel 70 can be reduced.

  In the machining control process illustrated in FIG. 5, machining is performed in the order of the front slope 81, the rear slope 82, the front face 71, and the rear face 72. However, the processing order can be changed. For example, the processing may be performed in the order of the front slope 81, the front face 71, the rear slope 82, and the rear face 72. Needless to say, the rear surface 72 may be formed earlier than the front surface 71.

  In the above embodiment, the positions of the outer peripheral side end portions of the slopes 81 and 82 and the outer peripheral side end portions of the front surface 71 and the rear surface 72 are appropriately set, so that the convex bevel 70 is efficiently chamfered with the chamfered surface 75, 76 is formed. However, the method of forming the chamfered surfaces 75 and 76 on the convex bevel 70 can be changed. For example, the spectacle lens processing apparatus 1 may chamfer the convex bevel 70 after forming the convex bevel 70 on which the chamfered surfaces 75 and 76 are not formed. The spectacle lens processing apparatus 1 may form a convex bevel that does not have the chamfered surfaces 75 and 76.

  In the above embodiment, the front surface 71 and the rear surface 72 are formed by an annular processing tool (for example, a grooving grindstone) 442 whose shape in contact with the lens LE is annular. However, it is also possible to form the front surface 71 and the rear surface 72 using a processing tool other than the annular processing tool 442. In the above embodiment, the relative angle between the annular processing tool 442 and the lens LE can be changed. However, even when the relative angle of the annular processing tool 442 is fixed, at least a part of the technique exemplified in the above embodiment can be applied.

1 Eyeglass lens processing device 5 CPU
70 convex bevel 71 front surface 72 rear surface 73 outer peripheral surface 75 front chamfered surface 76 rear chamfered surface 81 front slope 82 rear slope 311 slope formation processing tool 311F front slope formation processing tool 311B rear slope formation processing tool 432 angle change motor 442 Toroidal tool

Claims (8)

By moving the relative position between the processing tool for processing the lens by contacting the lens and the peripheral edge of the lens, a bevel for fitting the lens to the frame of the spectacles is formed on the peripheral edge of the lens. A spectacle lens processing apparatus capable of
A bevel to be formed on the periphery of the lens, having a front surface facing the front of the lens, a rear surface facing the rear of the lens, and an outer peripheral surface facing away from the optical axis of the lens. Shape information acquisition means for acquiring shape information specifying at least a part of the shape of the convex bevel;
A front surface trajectory calculating means for calculating a front surface trajectory that is a relative trajectory of the processing tool with respect to the lens when forming the front surface on the periphery of the lens, based on the shape information;
A rear surface trajectory calculating means for calculating a rear surface trajectory that is a relative trajectory of the processing tool with respect to the lens when forming the rear surface on the periphery of the lens, based on the shape information;
Drive control means for forming the convex bevel on the lens by moving the relative position of the lens and the processing tool according to each of the front surface locus and the rear surface locus;
An eyeglass lens processing apparatus comprising: The eyeglass lens processing apparatus according to claim 1,
The front plane trajectory calculating means includes:
Of the relative positions of the processing tool with respect to the lens when the processing tool is in contact with the front surface, a set of positions where the processing tool is in contact with the front surface from the most front side with respect to the lens is calculated. The eyeglass lens processing apparatus is characterized by calculating a locus for the front surface. The eyeglass lens processing apparatus according to claim 1 or 2,
The rear surface locus calculating means includes:
Of the relative positions of the processing tool with respect to the lens when the processing tool is in contact with the rear surface, a set of positions that contact the rear surface from the rearmost side with respect to the lens is calculated. The eyeglass lens processing apparatus is characterized by calculating a locus for the rear surface. The eyeglass lens processing apparatus according to any one of claims 1 to 3,
The processing tool includes an annular processing tool in which a shape of a portion in contact with the lens is an annular shape,
The spectacle lens processing apparatus, wherein the front surface trajectory calculating means and the rear surface trajectory calculating means calculate trajectories when the front surface and the rear surface are formed by the annular processing tool. The eyeglass lens processing apparatus according to claim 4,
An angle changing unit for changing an angle of the annular processing tool with respect to a peripheral edge of the lens;
The front surface trajectory calculation means and the rear surface trajectory calculation means calculate the front surface trajectory and the rear surface trajectory based on the angle of the annular processing tool changed by the angle changing unit. Calculate
The eyeglass lens processing apparatus, wherein the drive control means moves the relative position of the lens and the annular processing tool while controlling the angle of the annular processing tool by the angle changing unit. The eyeglass lens processing apparatus according to any one of claims 1 to 5,
In the processing tool, a processing surface inclined with respect to the edge surface of the lens is brought into contact with a peripheral edge of the lens, and inclined surfaces inclined with respect to the edge surface are formed on the front side edge portion and the rear surface side edge portion of the lens. Including a slope forming tool to be formed,
The drive control means includes
After the relative position of the lens and the slope forming processing tool is moved to form a slope on the front side edge of the lens, the lens and the processing tool are relatively moved according to the front surface locus. While moving the position,
After the relative position of the lens and the slope forming processing tool is moved to form a slope at the rear side edge of the lens, the lens and the processing tool are relatively moved according to the locus for the rear surface. An eyeglass lens processing apparatus characterized by moving a position. The eyeglass lens processing apparatus according to claim 6,
The drive control means determines the distance between the outer peripheral side ends of the two slopes formed on each of the front side edge and the rear side edge by the slope forming processing tool, and the front face of the convex bevel and The spectacle lens processing apparatus, wherein the distance is shorter than the distance between the outer peripheral side ends of the rear surface. Processing performed by a control device that controls the relative movement between the processing tool for processing the lens and the peripheral edge of the lens to form a bevel for fitting the lens on the frame of the spectacles at the peripheral edge of the lens. A control program,
By being executed by the processor of the control device,
A bevel to be formed on the periphery of the lens, having a front surface facing the front of the lens, a rear surface facing the rear of the lens, and an outer peripheral surface facing away from the optical axis of the lens. A shape information acquisition step for acquiring shape information for specifying at least a part of the shape of the convex bevel;
A front surface trajectory calculating step for calculating a front surface trajectory that is a relative trajectory of the processing tool with respect to the lens when the front surface is formed on the periphery of the lens, based on the shape information;
A rear surface trajectory calculating step for calculating a rear surface trajectory that is a relative trajectory of the processing tool with respect to the lens when the rear surface is formed on the periphery of the lens, based on the shape information;
Is executed by the control device.