Eyeglass lens shape measuring device, eyeglass lens processing device, and eyeglass lens shape measuring program

Abstract

To shorten the time for measuring the shape of a spectacle lens.SOLUTION: A spectacle lens shape measurement device for measuring the shape of a spectacle lens comprises: refraction surface shape measurement means which measures a lens refraction surface shape of at least one of a front surface and a rear surface of the spectacle lens held by a lens holding shaft; outer shape measurement means which measures the lens outer shape of the spectacle lens held by the lens holding shaft; and control means which simultaneously measures the lens refraction surface shape and the lens outer shape by operating the refraction surface shape measurement means and the outer shape measurement means.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to an eyeglass lens shape measuring device that measures the shape of an eyeglass lens, an eyeglass lens processing device that processes the periphery of an eyeglass lens, and an eyeglass lens shape measuring program that measures the shape of an eyeglass lens. [Background technology]

[0002] Known eyeglass lens shape measuring devices include a lens refractive surface shape measuring mechanism that measures the shape of the lens refractive surface by bringing a refractive surface measuring probe into contact with the lens refractive surface of an eyeglass lens held by a lens holding shaft, and a lens outer shape measuring mechanism that measures the lens outer shape by bringing a peripheral measuring probe into contact with the peripheral edge of the eyeglass lens held by the lens holding shaft (see, for example, Patent Document 1). Eyeglass lens shape measuring devices are used, for example, in eyeglass lens processing devices that process the peripheral edges of eyeglass lenses with a processing tool. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-210667 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional devices, the measurement of the refractive surface shape by the lens refractive surface shape measuring mechanism and the measurement of the outer shape by the lens outer shape measuring mechanism are performed separately. Also, in eyeglass lens processing devices, after measuring the lens shape, the measurement results are used to perform rough processing and finishing of the periphery of the eyeglass lens, and in some cases, chamfering, grooving, etc. As a result, the total time from holding the eyeglass lens on the lens holding shaft to completing processing of the periphery of the eyeglass lens is long. For this reason, it is desirable to shorten the overall time until the processing is completed, but conventional approaches have been to shorten the time for each process.

[0005] In view of the above-described conventional technology, the technical object of the present disclosure is to provide an eyeglass lens shape measuring device, an eyeglass lens processing device, and an eyeglass lens shape measuring program that can shorten the time required to measure the shape of an eyeglass lens. [Means for solving the problem]

[0006] In order to solve the above problems, the present disclosure is characterized by having the following configuration. (1) A spectacle lens shape measuring device according to a first aspect of the present disclosure is a spectacle lens shape measuring device for measuring the shape of a spectacle lens, and includes: a refractive surface shape measuring means for measuring the lens refractive surface shape of at least one of the front and rear surfaces of a spectacle lens held by a lens holding shaft; an outer shape measuring means for measuring the lens outer shape of the spectacle lens held by the lens holding shaft; and a control means for operating the refractive surface shape measuring means and the outer shape measuring means to simultaneously measure the lens refractive surface shape and the lens outer shape. The refractive surface shape measuring means has a refractive surface measuring element that is brought into contact with the refractive surface of the lens, and the outer shape measuring means has a peripheral measuring element that is brought into contact with the periphery of the eyeglass lens, and the control means operates the refractive surface shape measuring means so as to bring the refractive surface measuring element into contact with the refractive surface of the eyeglass lens and also operates the outer shape measuring means so as to bring the peripheral measuring element into contact with the periphery of the eyeglass lens, thereby simultaneously measuring the lens refractive surface shape and the lens outer shape. It is characterized by: (2) A spectacle lens processing device according to a second aspect of the present disclosure is characterized by including the spectacle lens shape measuring device of (1). (3) A spectacle lens shape measurement program according to a third aspect of the present disclosure measures the lens refractive surface shape of at least one of the front and rear surfaces of a spectacle lens held by a lens holding shaft. A refractive surface shape measuring means having a refractive surface measuring element that is brought into contact with the refractive surface of the lens. A refractive surface shape measuring means for measuring the outer shape of the eyeglass lens held by the lens holding shaft. The outer shape measuring means has a peripheral measuring element that is brought into contact with the peripheral edge of the eyeglass lens. and an outer shape measuring means, and the spectacle lens shape measuring program is executed by a control unit of the spectacle lens shape measuring device, and the spectacle lens shape measuring program operates the refractive surface shape measuring means and the outer shape measuring means, and measures the lens refractive surface shape and the lens outer shape simultaneously. In a control step, the refractive surface shape measuring means is operated so as to bring the refractive surface measuring element into contact with the refractive surface of the eyeglass lens, and the outer shape measuring means is operated so as to bring the periphery measuring element into contact with the periphery of the eyeglass lens, thereby simultaneously measuring the refractive surface shape of the lens and the outer shape of the lens. The control step is characterized in that it is executed by an eyeglass lens shape measuring device. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a diagram illustrating the configuration of an eyeglass lens shape measuring device according to an embodiment and the configuration of a processing mechanism unit in an eyeglass lens processing device. [Figure 2] FIG. 2 is a diagram illustrating a schematic configuration of a lens shape measuring unit. [Figure 3] FIG. 2 is a diagram illustrating a schematic configuration of a lens outer shape measurement unit. [Figure 4] 1 is an explanatory diagram illustrating a case where the outer shape of a spectacle lens is measured by a lens outer shape measuring unit. [Figure 5] FIG. 2 is a control system block diagram relating to the eyeglass lens shape measuring device and eyeglass lens processing device. [Figure 6] FIG. 10 is a diagram showing an example of a measurement trajectory for measuring the lens refractive surface shape on an unprocessed spectacle lens. [Figure 7] 10A and 10B are diagrams illustrating a calculation method for obtaining the outer shape of a spectacle lens. [Figure 8] FIG. 8 is an enlarged view of the spectacle lens and the periphery of the measuring element in FIG. 7. DETAILED DESCRIPTION OF THE INVENTION

[0008] [overview] A typical embodiment will be described below with reference to the drawings. Figures 1 to 5 are diagrams for explaining an eyeglass lens shape measuring device and eyeglass lens processing device according to this embodiment. Note that the items grouped in < > below can be used independently or in conjunction with each other.

[0009] The eyeglass lens shape measuring device exemplified in the present disclosure (e.g., eyeglass lens shape measuring device 10) comprises a refractive surface shape measuring means (e.g., lens refractive surface measuring unit 200), an outer shape measuring means (e.g., lens outer shape measuring unit 500), and a control means (e.g., control unit 50).

[0010] For example, the eyeglass lens shape measuring device may include a lens holding shaft (e.g., lens chuck shaft 102). For example, the eyeglass lens shape measuring device may include a rotation means (e.g., motor 120) that rotates the lens holding shaft around its axis to rotate the eyeglass lens. For example, the eyeglass lens shape measuring device may include a movement means (e.g., movement unit 300, second movement unit 330) that moves the lens holding shaft in a predetermined orthogonal direction (e.g., Y direction in FIG. 1) that is perpendicular to the axial direction of the lens holding shaft. For example, the eyeglass lens shape measuring device may include a data acquisition means (e.g., data acquisition unit 60) that acquires lens shape data. For example, the eyeglass lens shape measuring device may include a calculation means (e.g., control unit 50).

[0011] For example, the eyeglass lens shape measuring device may be provided in an eyeglass lens processing device (for example, eyeglass lens processing device 1). For example, the eyeglass lens processing device processes the periphery of an eyeglass lens held by a lens holding shaft using a processing tool (for example, processing tool 168).

[0012] <Refractive surface shape measuring means> For example, the refractive surface shape measuring means measures the lens refractive surface shape of at least one of the front and rear surfaces of a spectacle lens, which is a lens to be processed and held by a lens holding shaft. For example, the refractive surface shape measuring means has a refractive surface measuring element (e.g., refractive surface measuring element 206F, 206R) that is brought into contact with the lens refractive surface. For example, the refractive surface shape measuring means includes a detecting means (e.g., detector 213F, 213R) that detects the position of the refractive surface measuring element in the axial direction of the lens holding shaft.

[0013] <External shape measurement means> For example, the outer shape measuring means measures the outer shape of the eyeglass lens held by the lens holding shaft. For example, the outer shape measuring means has a peripheral measuring probe (e.g., peripheral measuring probe 520) that is brought into contact with the peripheral edge of the eyeglass lens. For example, the outer shape measuring means includes a detecting means (e.g., encoder 511) that detects the position of the peripheral measuring probe in the radial direction of the eyeglass lens held by the lens holding shaft. In other words, the radial direction of the eyeglass lens is defined as a direction perpendicular to the axial direction of the lens holding shaft.

[0014] <Control means> For example, the control means may simultaneously operate the refractive surface shape measuring means and the outer shape measuring means to simultaneously measure the lens refractive surface shape and the lens outer shape. For example, the control means may simultaneously measure the lens refractive surface shape and the lens outer shape by bringing the refractive surface measuring probe into contact with the lens refractive surface and the peripheral measuring probe into contact with the periphery of the eyeglass lens. This allows for a reduction in the time required for measuring the shape of the eyeglass lens. In other words, in conventional devices, the measurement of the refractive surface shape by the lens refractive surface shape measuring mechanism and the measurement of the outer shape by the lens outer shape measuring mechanism are performed separately, resulting in a problem of a long total measurement time. However, the present disclosure can alleviate this problem. In order to reduce the overall time required to complete eyeglass lens processing, the inventors of the present disclosure have focused on the novel approach of simultaneously measuring the lens refractive surface shape and the lens outer shape, rather than taking an approach based on each process, such as peripheral processing of the eyeglass lens, measuring the lens refractive surface shape, and measuring the lens outer shape, thereby reducing the overall lens processing time.

[0015] The simultaneous measurement of the lens refractive surface shape and the lens outer shape may be approximately simultaneous. For example, the simultaneous measurement of both may be simultaneous enough to shorten the overall measurement time compared to each individual measurement. For example, the simultaneous measurement of both may be performed in such a way that some of the measurements are performed simultaneously.

[0016] For example, the control means controls the rotation means to rotate the eyeglass lens, controls the movement means so that the refractive surface measurement element traces the lens refractive surface in accordance with the lens shape, and operates the outer shape measurement means to bring the rim measurement element into contact with the rim of the eyeglass lens. For example, the control means controls the movement means to change the position of the eyeglass lens in a predetermined direction (Y direction in FIG. 1) perpendicular to the lens holding axis for each rotation angle of the eyeglass lens so that the refractive surface measurement element traces the lens refractive surface in accordance with the lens shape. Then, for example, the control means acquires (calculates) the lens outer shape of the eyeglass lens based on the detection result of the rim measurement element position detection means, the movement data of the movement means, and the rotation data of the rotation means. For example, the control means may acquire the lens outer shape of the entire circumference of the eyeglass lens. For example, the control means may also function as the calculation means. Of course, the calculation means may have a configuration different from that of the control means.

[0017] <Other configurations> For example, the refractive surface shape measuring means and the outer shape measuring means are arranged at positions where they do not interfere with each other when the lens refractive surface shape and the lens outer shape are simultaneously operated. For example, the moving members of the refractive surface shape measuring means including the refractive surface measuring element (e.g., arms 204F, 204R, etc.) and the moving members of the outer shape measuring means including the peripheral measuring element (e.g., arm 501, etc.) are arranged so as not to interfere with each other when the lens refractive surface shape and the lens outer shape are simultaneously operated. This makes it possible to simultaneously measure the lens refractive surface shape and the lens outer shape, thereby shortening the time required to measure the shape of an eyeglass lens.

[0018] <Eyeglass lens shape measurement program> It should be noted that the present disclosure is not limited to the device described in this embodiment. For example, an eyeglass lens shape measurement program (software) that performs the functions of the following embodiments may be supplied to a system or device via a network or various storage media. Then, a control device (e.g., a CPU) of the system or device may read and execute the program.

[0019] For example, a spectacle lens shape measurement program executed by a spectacle lens shape measuring device causes the spectacle lens shape measuring device to execute a control step that operates the refractive surface shape measuring means and the outer shape measuring means to simultaneously measure the lens refractive surface shape and the lens outer shape. For example, the spectacle lens shape measurement program causes the spectacle lens shape measuring device to execute an acquisition step that acquires the lens outer shape. For example, the control step controls the rotation means to rotate the spectacle lens and the movement means so that the refractive surface measurement element traces the lens refractive surface in accordance with the lens shape, thereby changing the position of the spectacle lens in a predetermined orthogonal direction perpendicular to the lens holding axis for each rotation angle of the spectacle lens. For example, the acquisition step acquires (calculates) the lens outer shape around the entire circumference of the spectacle lens based on the detection result of the peripheral measurement element position detection means, movement data of the movement means, and rotation data of the rotation means.

[0020] [Example] One exemplary embodiment of the present disclosure will be described with reference to the drawings. Fig. 1 is a diagram illustrating the configuration of an eyeglass lens shape measuring device 10 according to the embodiment, and the configuration of a processing mechanism unit in an eyeglass lens processing device 1 equipped with the eyeglass lens shape measuring device 10.

[0021] The eyeglass lens processing apparatus 1 includes a lens holding unit 100, which is an example of lens holding means having a lens holding shaft that holds an eyeglass lens (hereinafter referred to as lens LE). The eyeglass lens processing apparatus 1 includes a processing tool unit 150. The processing tool unit 150 is configured to rotate a processing tool 168 that processes the periphery of the lens LE. For example, the eyeglass lens processing apparatus 1 includes a moving unit 300, which is an example of moving means. The moving unit 300 is configured to change (adjust) the relative positional relationship between the lens LE and the processing tool 168 held by the processing tool unit 150.

[0022] The eyeglass lens shape measuring device 10 shares the lens holding unit 100 provided in the eyeglass lens processing device 1 as lens holding means. The eyeglass lens shape measuring device 10 is provided with a lens refractive surface measuring unit 200 that measures the lens refractive surface shape of at least one of the front and rear surfaces of the lens LE. The eyeglass lens shape measuring device 10 is provided with a lens outer shape measuring unit 500 that measures the lens outer shape of the lens LE. The eyeglass lens shape measuring device 10 also shares the moving unit 300 provided in the eyeglass lens processing device 1 as moving means when measuring the shape of the lens LE. The moving unit 300 is configured to change (adjust) the relative positional relationship between the lens LE and the measuring probes provided in the lens refractive surface measuring unit 200 and the lens outer shape measuring unit 500, respectively.

[0023] <Lens holding unit> The lens holding unit 100 includes a lens chuck shaft 102, which is an example of a lens holding shaft for clamping (holding) and rotating the lens LE, and a carriage 101. The lens chuck shaft 102 includes a pair of lens chuck shafts 102L and 102R. The lens chuck shaft 102L is rotatably held by the left arm 101L of the carriage 101, and the lens chuck shaft 102R is rotatably held by the right arm 101R of the carriage 101. The lens chuck shaft 102 (lens LE) is rotated by a motor 120, which is an example of a rotation means.

[0024] <Processing tool unit> The processing tool unit 150 includes a motor 160 for rotating a processing tool rotation shaft 161. The processing tool rotation shaft 161 is rotatably held on the main body base 170 in a positional relationship parallel to the lens chuck shaft 102. A plurality of processing tools 168 for processing the periphery of the lens LE are attached to the processing tool rotation shaft 161. For example, the processing tool 168 includes a roughing tool 166. For example, the processing tool 168 includes a finishing tool 164, which is an example of a beveling tool. The finishing tool 164 includes a V-groove for beveling to form a bevel on the periphery of the lens LE. The finishing tool 164 may include a flat finishing surface for flat finishing. The processing tool 168 may also include a front beveling grindstone 162 and a rear beveling tool 163 for high-curve lenses. The processing tool 168 may also include a finishing tool for mirror finishing. For example, the processing tool 168 is a grindstone, but may be a cutter.

[0025] <Mobile Unit> The moving unit 300 is configured to adjust the relative position of the lens LE held by the lens chuck shaft 102 and the processing tool 168. For example, the moving unit 300 includes a first moving unit 310 that changes the axial distance between the lens chuck shaft 102 and the processing tool rotation shaft 161, and a second moving unit 330 that moves the lens LE in the axial direction of the lens chuck shaft 102. In this embodiment, the axial direction of the lens chuck shaft 102 is defined as the X direction. A predetermined direction that is perpendicular to the axial direction of the lens chuck shaft 102 and changes the axial distance between the lens chuck shaft 102 and the processing tool rotation shaft 161 is defined as the Y direction.

[0026] The first moving unit 310 includes a motor 315. The rotation of the motor 315 moves the moving support base 301 in the X direction. As a result, the carriage 101 and the lens chuck shaft 102 (lens LE) mounted on the moving support base 301 move in the X direction. Note that the first moving unit 310 may be configured to move the processing tool rotation shaft 161 in the X direction.

[0027] The second moving unit 330 includes a motor 335 for moving the carriage 101 (lens chuck shaft 102) in the Y direction. The carriage 101 is held by the moving support base 301 so as to be movable in the Y direction along shafts 333 and 334. Rotation of the motor 335 is transmitted to a ball screw 337 extending in the Y direction, and the carriage 101 (lens chuck shaft 102 and lens LE) is moved in the Y direction by the rotation of the ball screw 337. A detector 336 for detecting the position of the lens chuck shaft 102 in the Y direction is attached to the motor 335. Note that, although the second moving unit 330 is configured to move the lens chuck shaft 102 in the Y direction in this embodiment, it may also be configured to move the processing tool rotation shaft 161 in the Y direction. In other words, the second moving unit 330 may be configured to relatively change the distance between the lens chuck shaft 102 and the processing tool rotation shaft 161.

[0028] The moving unit 300 is also used as a moving unit for the eyeglass lens shape measuring device 10. That is, the first moving unit 310 is used to change the positional relationship between the lens LE in the axial direction (X direction) of the lens chuck shaft 102 and the measuring probes (described later) provided in the lens refractive surface measuring unit 200 and the lens outer shape measuring unit 500. The second moving unit 330 is used to change the positional relationship between the lens chuck shaft 102 (lens LE) and the measuring probes (described later) provided in the lens refractive surface measuring unit 200 and the lens outer shape measuring unit 500 in a predetermined direction (Y direction) perpendicular to the axial direction of the lens chuck shaft 102. <Lens refractive surface measurement unit> 1, a lens refractive surface measuring unit 200 is disposed above the carriage 101. The lens refractive surface measuring unit 200 is used to measure the shape of the front surface (front refractive surface) and the shape of the rear surface (rear refractive surface) of the lens LE. The lens refractive surface measuring unit 200 includes, for example, a measuring unit 200F for measuring the shape of the front surface of the lens and a measuring unit 200R for measuring the shape of the rear surface of the lens.

[0029] FIG. 2 is a schematic diagram of the measurement unit 200F. The measurement unit 200F has a refractive surface measurement element 206F that contacts the front surface of the lens. The refractive surface measurement element 206F is attached to the tip of an arm 204F. The arm 204F is held by an attachment base 201F so as to be movable in the X direction. The arm 204F is connected to a motor 216F via a rack 211F, a pinion 212F, a gear 214F, etc. The arm 204F is moved in the X direction by driving the motor 216F, and the refractive surface measurement element 206F is pressed against the front surface of the lens LE. The pinion 212F is attached to the rotation axis of a detector 213F (e.g., an encoder). The position of the refractive surface measurement element 206F moved in the X direction is detected by the detector 213F.

[0030] The configuration of the measuring unit 200R for measuring the lens rear surface shape is symmetrical to that of the measuring unit 200F, and therefore a description thereof will be omitted. The measuring unit 200R includes a refractive surface stylus 206R that comes into contact with the lens rear surface, a motor 216R that moves the refractive surface stylus 206R in the X direction, and a detector 213R that detects the movement position of the refractive surface stylus 206R in the X direction.

[0031] When measuring the lens refractive surface shape, the refractive surface stylus 206F is brought into contact with the lens front surface, and the refractive surface stylus 206R is brought into contact with the lens rear surface. In this state, the lens LE is rotated by the lens holding unit 100, and the lens chuck shafts 102L and 102R are moved in the Y direction by the moving unit 300 based on the target lens shape data, thereby simultaneously measuring the lens shapes of the front and rear lens surfaces corresponding to the target lens shape. That is, the measuring unit 200F measures the edge position of the front lens surface corresponding to the target lens shape, and the measuring unit 200R measures the edge position of the rear lens surface corresponding to the target lens shape.

[0032] <Lens outer shape measurement unit> The lens outer shape measuring unit 500 is disposed behind the lens refractive surface measuring unit 200R in FIG.

[0033] FIG. 3 is a schematic diagram of a lens outer shape measuring unit 500. The lens outer shape measuring unit 500 includes a cylindrical periphery measuring element 520 that comes into contact with the periphery of the lens LE. The periphery measuring element 520 is connected to a rotating shaft 502 via an arm 501. A central axis 520a of the periphery measuring element 520 and a central axis 502a of the rotating shaft 502 are arranged in a positional relationship parallel to the axial direction (X direction) of the lens chuck shaft 102. The rotating shaft 502 is held by a holder 503 so as to be rotatable about the central axis 502a. The holder 503 is fixed to the block 2 in FIG. 1. A sector-shaped gear 505 is fixed to the rotating shaft 502, and the gear 505 is rotated by a motor 510. A pinion gear 512 that meshes with the gear 505 is attached to the rotating shaft of the motor 510. An encoder 511 serving as a detector is attached to the rotating shaft of the motor 510.

[0034] FIG. 4 is an explanatory diagram of the case where the outer shape of the lens LE is measured by the lens outer shape measuring unit 500. In a single measurement by the lens outer shape measuring unit 500, the chuck center CHc of the lens chuck shaft 102 is moved to a predetermined measurement position (on a movement locus MFc of the central axis 520a of the periphery measuring probe 520, which rotates around the rotation axis 502). The motor 510 rotates the arm 501 in a direction perpendicular to the X direction, thereby moving the periphery measuring probe 520, which has been placed in a retracted position, toward the lens LE, and the periphery measuring probe 520 comes into contact with the periphery of the lens LE. The motor 510 also applies a predetermined measurement pressure to the periphery measuring probe 520. The lens LE then rotates once as the lens chuck shaft 102 rotates, and the movement of the periphery measuring probe 520 for each rotation angle of the lens LE is detected by the encoder 511. This allows the outer shape of the lens LE to be measured relative to the chuck center CHc of the lens chuck shaft 102. For example, a single measurement by the lens outer shape measuring unit 500 is used to obtain the outer shape of the processed lens in order to check whether the outer shape of the lens LE has been processed as planned.

[0035] <Layout of the lens refractive surface measurement unit and lens outer shape measurement unit> 4, position MLp, where the refractive surface styluses 206F, 206R of the lens refractive surface measuring unit 200 contact the refractive surface of the lens LE, is a position off the movement locus MFc of the peripheral measurement stylus 520 and is set on the movement locus in the Y direction along which the lens chuck shaft 102 moves. Even when the lens refractive surface measuring unit 200 and the lens outer shape measuring unit 500 are operated simultaneously, the moving members (arms 204F, 204R, etc.) of the lens refractive surface measuring unit 200 including the refractive surface stylus 206F, 206R and the moving members (arm 501, etc.) of the lens outer shape measuring unit 500 including the peripheral measurement stylus 520 are arranged so as not to interfere with each other within the range from the minimum diameter to the maximum diameter that can be measured of the lens LE. This enables simultaneous measurement of the lens refractive surface shape and the lens outer shape.

[0036] <Control system block diagram> FIG. 5 is a control system block diagram relating to the eyeglass lens shape measuring device 10 and eyeglass lens processing device 1. The eyeglass lens shape measuring device 10 includes a control unit 50. The control unit 50 also serves as the control unit for the eyeglass lens processing device 1. Electrical components (motors, etc.) of each unit shown in FIGS. 1 to 3 are connected to the control unit 50. The control unit 50 is configured to perform various calculations for measuring the shape of the lens LE and for lens processing. The control unit 50 may also serve as output means for outputting data.

[0037] The eyeglass lens shape measuring device 10 and the eyeglass lens processing device 1 include a data acquisition unit 60. The data acquisition unit 60 may also function as a data input unit. For example, the data acquisition unit 60 includes a display 62. For example, the data acquisition unit 60 includes a data input unit 63. For example, the display 62 may have a touch panel function and be configured to include the data input unit 63.

[0038] The eyeglass lens shape measuring device 10 and eyeglass lens processing device 1 are equipped with a memory 20, which is an example of storage means. The memory 20 stores various data acquired by the data acquisition unit 60. The memory 20 also stores various programs for controlling the operations of the eyeglass lens shape measuring device 10 and eyeglass lens processing device 1. For example, the memory 20 stores a program for measuring the refractive surface shape and lens outer shape of the lens LE. The memory 20 also stores a program related to peripheral processing of the lens LE.

[0039] The data acquisition unit 60 and the memory 20 are connected to the control unit 50. The data acquisition unit 60 may be connected to the lens shape measuring device 30. For example, the lens shape measuring device 30 obtains the lens shape (the target outer shape for processing the lens periphery) of the lens LE by measuring the rim of an eyeglass frame. The lens shape stored in the memory 20 may also be used. The data acquisition unit 60 obtains lens shape data from the lens shape measuring device 30 or the memory 20. A "lens shape" is a two-dimensional shape defined by a radius vector length and a radius vector angle, and is self-evident and well known to those skilled in the art, so a detailed description thereof will be omitted.

[0040] <Operation> The operation of the eyeglass lens shape measuring device 10 and eyeglass lens processing device 1 having the above-described configuration will be described. First, the data acquisition unit 60 acquires the lens shape data (radial length r, radial angle θ) of the lens LE. For example, the contour shape of the rim of the eyeglass frame measured by the lens shape measuring device 30 is input to the data acquisition unit 60. The lens shape data may be acquired by the data acquisition unit 60 by calling up data stored in the memory 20.

[0041] Once the target lens shape data has been acquired, the operator sets (inputs) processing conditions for processing the periphery of the lens LE using the display 62. For example, layout data for locating the optical center position of the lens LE relative to the target lens shape is input for processing the periphery of the lens LE. For example, the layout data includes the distance FPD between the centers of the left and right target lenses, the interpupillary distance PD, and the height distance of the optical center relative to the center of the target lens shape. In addition, processing conditions such as the lens material, frame type (metal, cell, rimless, etc.), lens periphery processing type (bevel processing, flat processing, groove processing, etc.), and whether or not mirror processing is performed are input.

[0042] After inputting the processing conditions is completed, the operator holds the lens LE on the lens chuck shafts 102 (102L, 102R), and first starts the operation of the eyeglass lens shape measuring device 10. Prior to peripheral processing of the lens LE, the control unit 50 executes an eyeglass lens shape measuring program, and the eyeglass lens shape measuring device 10 measures the shape of the lens LE.

[0043] The control unit 50 determines a measurement trajectory for measuring the lens refractive surface shape based on the target lens shape. Fig. 6 is a diagram showing an example of a measurement trajectory MT for measuring the lens refractive surface shape on an unprocessed lens LE. In the case of bevel processing, the measurement trajectory MT may be set to include two measurement trajectories, a first trajectory corresponding to the bevel shoulder and a second trajectory located a certain distance outside the first trajectory. For simplicity of explanation, only one trajectory will be used as an example.

[0044] After acquiring the measurement trajectory MT, the control unit 50 controls the moving unit 300 to move the lens LE in the Y direction so that the position of the measurement trajectory MT in the Y direction is located at a predetermined measurement position (position MLp in FIG. 4 ) of the refractive surface styluses 206F and 206R of the lens refractive surface measuring unit 200. Next, the control unit 50 drives the motors 216F and 216R of the lens refractive surface measuring unit 200 to move the refractive surface styluses 206F and 206R, which have been placed in the retracted positions, toward the lens LE and bring them into contact with the front and rear refractive surfaces of the lens LE, respectively. At this time, the positions on the measurement trajectory MT where the refractive surface styluses 206F and 206R contact the refractive surface of the lens LE are, for example, positions in the 90-degree direction on the measurement trajectory MT in FIG. 6 . At the same time, the control unit 50 drives the motor 510 to move the peripheral stylus 520, which has been placed in the retracted position, toward the lens LE and bring it into contact with the peripheral edge of the lens LE. In this state, the control unit 50 drives the motor 120, controls the driving of the second moving unit 330 based on the measurement trajectory MT while rotating the lens LE (lens chuck shaft 102) once, and changes (controls) the position of the lens LE (lens chuck shaft 102) in the Y direction for each rotation angle of the lens LE so that the refractive surface measuring probes 206F, 206R trace the front and rear refractive surfaces in accordance with the target lens shape (measurement trajectory MT).

[0045] As the position of the lens LE in the Y direction changes for each rotation angle of the lens LE, the positions of the front and rear refraction surfaces of the lens LE in the X direction, which are in contact with the refraction surface styluses 206F and 206R, also change. The positions of the front and rear refraction surfaces for each lens rotation angle in the X direction corresponding to the measurement trajectory MT are detected by the detectors 213F and 213R, respectively. The control unit 50 obtains shape information (mr, mθ, mz) of the front and rear refraction surfaces based on the detection results of the detectors 213F and 213R. mr is the radial length of the measurement trajectory MT, mθ is the radial angle, and mz is position data of the lens refraction surface in the X direction (distance data relative to a predetermined reference position).

[0046] Furthermore, simultaneously with the measurement of the refractive surface of the lens LE, the lens outer shape measurement unit 500 measures the outer shape of the lens LE. At this time, since the measurement of the outer shape of the lens LE is performed simultaneously with the measurement of the refractive surface of the lens LE, the control unit 50 corrects for changes in the position of the lens LE in the Y direction to obtain the outer shape. That is, the control unit 50 obtains the measurement results of the outer shape of the lens LE based on the detection results of the encoder 511 of the lens outer shape measurement unit 500 and movement data (control data) that is change data of the position of the lens chuck shaft 102 in the Y direction for each rotation angle of the lens LE.

[0047] 7 and 8, a calculation method for obtaining the outer shape of the lens LE by correcting the change in position of the lens LE in the Y direction that accompanies measurement of the refractive surface of the lens LE will be described below. Fig. 7 shows a view of the lens LE held by the lens chuck shaft 102 as seen from the rear side of the lens (the right side in Fig. 2). Fig. 8 is an enlarged view of the lens LE and the periphery of the peripheral measuring stylus 520 in Fig. 7.

[0048] 7, the rotation center (position of the central axis 502a) of the peripheral measurement element 520 is designated as Uo. The rotation center Uo is set as the origin, the movement direction of the lens chuck shaft 102 in the Y direction is designated as the y axis, and the direction perpendicular to the y axis is designated as the x axis (the x axis and y axis are axes for convenience of explanation and are different from the X direction and Y direction of the device shown in FIG. 1).

[0049] The movement locus along which the chuck center CHc of the lens chuck shaft 102 moves in the Y direction is defined as YA. The intersection of this movement locus YA and the movement locus MFc of the center Fc (central axis 520a) of the peripheral measurement stylus 520 is defined as the reference position So. The reference position So is the position to which the chuck center CHc moves when the lens outer shape measurement unit 500 operates independently. In FIG. 7, the contact position of the lens LE where the refractive surface measurement styluses 206F, 206R come into contact is indicated by MLp. The contact position MLp is a predetermined position set on the movement locus YA. When the lens refractive surface measurement unit 200 measures the lens refractive surface, the chuck center CHc moves on the movement locus YA while the lens LE is rotated so that the measurement locus MT is located at the contact position MLp. When the lens LE is at a certain rotation angle θn, the distance of the chuck center CHc from the reference position So is defined as Yn. 7 and 8 show a state in which the periphery probe 520 comes into contact with the periphery of the lens LE when the chuck center CHc has moved by a distance Yn relative to the reference position So.

[0050] 7, the line segment connecting the center of rotation Uo and the reference position So is designated as UA, and the angle formed by the line segment UA and the y-axis is designated as κ. The angle κ is a known value obtained by calibration of the lens outer diameter measuring unit 500. The origin direction of the encoder 511 of the lens outer diameter measuring unit 500 relative to the center of rotation Uo is designated as No. The angle of the line segment UA relative to the origin direction No is designated as ε. The angle ε is a known value obtained by calibration of the lens outer diameter measuring unit 500.

[0051] The line segment connecting the center of rotation Uo and the center Fc of the peripheral measurement element 520 is defined as LA. The length of the line segment LA is a known value. The angle of the line segment LA with respect to the origin direction No, centered on the center of rotation Uo, is defined as enc. The angle enc is an angle detected by the encoder 511.

[0052] 8, the line segment connecting the reference position So and the center Fc of the peripheral measurement probe 520 that contacts the peripheral edge of the lens LE is denoted by Ro. The length of the line segment Ro can be calculated using the following formula 1, which is used to calculate the chord length.

[0053]

number

[0054]

number

[0055]

number

[0056] Here, the x-direction component Xeo of the line segment Ro, the y-direction component Yeo of the line segment Ro, the x-direction component Xen of the line segment Ren, and the y-direction component Yen of the line segment Ren are respectively expressed by the following equations.

[0057]

number

[0058]

number

[0059] As described above, by simultaneously measuring the lens refractive surface by the lens refractive surface measuring unit 200 and measuring the lens outer shape by the lens outer shape measuring unit 500, the measurement time can be shortened compared to when each unit is operated independently. As a result, in the eyeglass lens processing apparatus 1, the overall processing time from when the lens LE is held by the lens chuck shaft 102 to the completion of lens processing can be shortened.

[0060] Once the measurement results of the refractive surface shape and the outer shape of the lens LE are obtained, the peripheral edge processing of the lens LE is performed. The peripheral edge processing of the lens LE will be briefly described below. In the following, the case of bevel processing will be described.

[0061] First, rough machining is performed. The control unit 50 determines a rough machining path based on the target lens shape and acquires control data for the rough machining based on the rough machining path. For example, the rough machining path is determined as a path that is a certain distance (e.g., 0.5 mm) outside the finish machining path based on the target lens shape. The control data for the rough machining is obtained by determining the maximum value of the inter-axis distance LN (not shown) between the lens chuck shaft 102 and the machining tool rotation shaft 161 when the rough machining path contacts the rough machining tool 166 for each rotation angle of the lens LE. The control unit 50 controls the drive of the second moving unit 330 based on the control data for the inter-axis distance LN, and the rough machining tool 166 rough-machines the periphery of the lens LE.

[0062] During this rough processing, outer shape data of the lens LE obtained by measurement by the lens outer shape measuring unit 500 may be used. For example, the outer shape data of the lens LE is used to control the movement speed in the Y direction (the direction of the axis-to-axis distance LN) when bringing the unprocessed lens LE and the rough processing tool 166 closer to each other. For example, the control unit 50 moves the lens LE placed in the standby position at a high speed until the lens LE approaches the vicinity of the rough processing tool 166, and after the lens LE approaches the vicinity of the rough processing tool 166, moves the lens LE at a speed set for actually rough processing the peripheral edge of the lens LE. This makes it possible to shorten the processing time of the lens LE.

[0063] Furthermore, for example, the outer shape data of the lens LE may be used to control movement in the Y direction when the roughing tool 166 roughly processes the periphery of the lens LE. For example, lens thickness data for each rotation angle of the lens LE from the outer shape of the unprocessed lens LE to the roughing path is calculated based on the curved shapes of the front and rear surfaces of the lens obtained from the measurement results of the front refractive surface of the lens and the measurement results of the lens outer shape. Then, based on the processing distance of the processing point for each lens rotation angle (the distance from the rotation center of the lens LE to the processing point) and the lens thickness at the processing point, a cutting depth at which the torque applied to the lens chuck shaft 102 is approximately constant is calculated, and the drive of the second moving unit 330 in the Y direction is controlled according to the calculated cutting depth (see Japanese Patent Application Laid-Open No. 2010-179397 for details of this control). This reduces the so-called "axial misalignment," which occurs when the axial angle of the lens LE is misaligned with the rotation angle of the lens chuck shaft 102 during roughing.

[0064] After the roughing is completed, the bevel is then finished. The control unit 50 calculates the bevel path (information on the radius vector of the lens shape and information on the position of the bevel apex in the X direction) based on information on the shape of the lens LE expected after finishing, and the moving unit 300 is controlled based on the bevel path, and the peripheral edge of the lens LE after roughing is beveled by the finishing tool 164. Note that the measurement results of the lens refractive surface measuring unit 200 are used, for example, to calculate the position of the bevel apex in the X direction when the bevel path is calculated. After the finishing is completed, the lens chuck shaft 102 is returned to a predetermined initial position, and the peripheral edge processing of the lens LE is completed.

[0065] <Example of transformation> For example, in the above embodiment, the lens refractive surface measuring unit 200 simultaneously measures the front and rear refractive surfaces of the lens LE, but the front and rear refractive surfaces may be measured separately. In this case, the simultaneous measurement of the lens refractive surface shape and the lens outer shape may be controlled so that the measurement of the lens outer shape is performed simultaneously with the measurement of one of the front and rear refractive surfaces of the lens LE.

[0066] In the above description, the measurement locus MT in the measurement by the lens refractive surface measuring unit 200 is one revolution, but it may be two revolutions using different measurement loci. In this case, it is sufficient that the measurement by the lens refractive surface measuring unit 200 and the measurement by the lens outer shape measuring unit 500 are performed simultaneously on at least one revolution of the measurement locus.

[0067] In the above description, the refractive surface measurement probes (206F, 206R) are brought into contact with the refractive surface of the lens, and the peripheral measurement probe 520 is also brought into contact with the peripheral edge of the lens LE at the same time during one rotation of the lens LE, but the simultaneous measurement of the lens refractive surface shape and the lens outer shape may be carried out partially at the same time. For example, when obtaining a rough outline of the outer shape of the lens LE, the peripheral measurement probe 520 may be brought into temporary contact with the peripheral edge of the lens LE during one rotation of the lens LE, so that both measurements are carried out simultaneously.

[0068] The lens outer shape measuring unit 500 shown in FIG. 3 is an example of a means for measuring the outer shape of the lens LE, and other mechanisms may be used. For example, the outer shape of the lens LE may be measured using a second moving unit 330 that moves the lens chuck shaft 102 in the Y direction and a peripheral measuring probe (which may be, for example, a roughing tool 166) attached to the processing tool rotation shaft 161. The control unit 50 controls the driving of the first moving unit 310 and the second moving unit 330 to move the lens LE in the Y direction so that the lens LE abuts against the peripheral measuring probe attached to the processing tool rotation shaft 161. Next, the control unit 50 drives the motor 120 to rotate the lens LE one revolution while keeping the lens LE in abutment against the peripheral measuring probe. At this time, the control unit 50 calculates the distance at which the lens LE abuts against the peripheral measuring probe relative to the chuck center for each rotation angle of the lens LE (lens chuck shaft 102) based on the detection signal output from the detector 336. This allows the outer shape of the lens LE to be acquired.

[0069] Although typical embodiments of the present disclosure have been described above, the present disclosure is not limited to the embodiments shown here, and various modifications are possible within the scope of the same technical concept of the present disclosure. [Explanation of symbols]

[0070] 1 Eyeglass lens processing equipment 10 Eyeglass lens shape measuring device 50 Control Unit 60 Data Acquisition Units 102 Lens chuck axis 120 motor 168 Processing tools 200 Lens Refractive Surface Measurement Unit 206F, 200R Refractive Surface Probe 213F, 213R detectors 300 Mobile Units 500 Lens Outer Diameter Measurement Unit 520 Peripheral probe 511 Encoder

Claims

1. In an eyeglass lens shape measuring device for measuring the shape of an eyeglass lens, a refractive surface shape measuring means for measuring the refractive surface shape of at least one of the front and rear surfaces of the spectacle lens held by the lens holding shaft; an outer shape measuring means for measuring the outer shape of the eyeglass lens held by the lens holding shaft; a control means for operating the refractive surface shape measuring means and the outer shape measuring means to simultaneously measure the lens refractive surface shape and the lens outer shape, the refractive surface shape measuring means has a refractive surface measuring element that is brought into contact with the refractive surface of the lens, the outer shape measuring means has a peripheral measuring element that is brought into contact with the peripheral edge of the eyeglass lens, The control means operates the refractive surface shape measuring means to bring the refractive surface measuring element into contact with the refractive surface of the eyeglass lens, and operates the outer shape measuring means to bring the rim measuring element into contact with the rim of the eyeglass lens, thereby simultaneously measuring the lens refractive surface shape and the lens outer shape.

2. 2. The eyeglass lens shape measuring device according to claim 1, a rotation means for rotating the lens holding shaft around its axis to rotate the eyeglass lens; a moving means for moving the lens holding shaft in a predetermined direction perpendicular to the axial direction of the lens holding shaft; and a data acquisition means for acquiring target lens shape data. The control means controls the rotation means to rotate the eyeglass lens, controls the movement means so that the refractive surface measuring element traces the refractive surface of the eyeglass lens in accordance with the target lens shape data, and operates the outer shape measuring means to bring the periphery measuring element into contact with the periphery of the eyeglass lens.

3. 3. The eyeglass lens shape measuring device according to claim 2, the outer shape measuring means includes a peripheral measurement element position detecting means for detecting the position of the peripheral measurement element in the radial direction of the eyeglass lens held by the lens holding shaft, The eyeglass lens shape measuring device is characterized in that the control means acquires the lens outer shape of the eyeglass lens based on the detection result of the peripheral measuring element position detection means, movement data of the moving means, and rotation data of the rotating means.

4. The eyeglass lens shape measuring device according to any one of claims 1 to 3, a refractive surface shape measuring means for measuring the refractive surface shape of a spectacle lens and a peripheral shape measuring means for measuring the peripheral shape of a spectacle lens;

5. 5. An eyeglass lens processing device for processing a peripheral edge of an eyeglass lens with a processing tool, comprising the eyeglass lens shape measuring device according to any one of claims 1 to 4.

6. 1. A spectacle lens shape measuring program executed by an eyeglass lens shape measuring device comprising: a refractive surface shape measuring means for measuring the lens refractive surface shape of at least one of the front and rear surfaces of an eyeglass lens held by a lens holding shaft, the refractive surface shape measuring means having a refractive surface measuring element to be brought into contact with the lens refractive surface; and an outer shape measuring means for measuring the lens outer shape of the eyeglass lens held by the lens holding shaft, the outer shape measuring means having a peripheral measuring element to be brought into contact with the peripheral edge of the eyeglass lens, The control unit of the eyeglass lens shape measuring device executes the a control step of operating the refractive surface shape measuring means and the outer shape measuring means to simultaneously measure the lens refractive surface shape and the lens outer shape, wherein the control step of operating the refractive surface shape measuring means to bring the refractive surface measuring element into contact with the refractive surface of the eyeglass lens and the outer shape measuring means to bring the rim measuring element into contact with the rim of the eyeglass lens, thereby simultaneously measuring the lens refractive surface shape and the lens outer shape.

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