Eyeglass lens shape measuring device, eyeglass lens processing device equipped with the same, and eyeglass lens shape measuring program

Abstract

To provide a spectacle lens shape measuring apparatus that shortens the measuring time of the refraction surface shape of a lens.SOLUTION: A spectacle lens shape measuring apparatus comprises: holding means for holding a spectacle lens; a probe brought into contact with a refraction surface of the spectacle lens; moving means for relatively changing the positional relation between the spectacle lens and the probe; detection means for detecting the position of the probe in a holding axis direction of the holding means; measurement locus determination means for determining a reference locus ST1 for one circumference of the spectacle lens based on a lens shape, and determining a measurement locus so as to have a component partially varied in a radial direction with respect to the reference locus; and control means for controlling the moving means based on the measurement locus and acquiring the refraction surface shape of the spectacle lens in the holding axis direction of the holding means based on the detection result of the detection means.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present disclosure relates to a spectacle lens shape measuring device that measures the shape of a refractive surface of a spectacle lens, a spectacle lens processing device including the same, and a spectacle lens shape measuring program that measures the shape of a refractive surface of a spectacle lens. [Background technology]

[0002] An eyeglass lens shape measuring device that measures the shape of the refractive surfaces (front and rear surfaces of the lens having refractive power) of an eyeglass lens is provided, for example, in an eyeglass lens processing device that processes the periphery of an eyeglass lens with a processing tool. The eyeglass lens shape measuring device has a measuring element that contacts the front refractive surface (front lens surface) and the rear refractive surface (rear lens surface) of the eyeglass lens (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-004678 A Summary of the Invention [Problem to be solved by the invention]

[0004] The measurement of the refractive surface of a lens by an eyeglass lens shape measuring device is performed, for example, by rotating the lens once while contacting a gauge with the refractive surface based on the lens shape (the outer diameter shape of the target lens) and detecting the position of the gauge in the axial direction of the lens chuck shaft that holds the eyeglass lens. In processing the periphery of an eyeglass lens, in order to obtain edge position information (edge ​​position according to the lens shape and inclination information of the refractive surface at the edge position, etc.) planned after finishing processing of the lens, conventionally, one refractive surface is measured at least twice (two revolutions) with different measurement trajectories.

[0005] However, there was a problem with measuring one refracting surface twice (two revolutions), which lengthened the measurement time.

[0006] In view of the above-mentioned conventional techniques, the present disclosure has as its technical object to shorten the measurement time for the refractive surface shape of a lens. [Means for solving the problem]

[0007] In order to solve the above problems, Disclosure is characterized by having the following configuration: (1) The eyeglass lens shape measuring device according to the first aspect of the present disclosure is a device for measuring the peripheral edge of an eyeglass lens by a processing tool provided in an eyeglass lens processing device. Grinding and cutting Before processing, the shape of the refractive surface of the eyeglass lens is measured based on the lens shape. The eyeglass lens processing apparatus is provided with The eyeglass lens shape measuring device comprises: a holding means having a holding shaft that holds and rotates an eyeglass lens; a measuring probe to be brought into contact with the refractive surface of the eyeglass lens; a moving means for relatively changing the positional relationship between the measuring probe and the refractive surface of the eyeglass lens held on the holding shaft; a detection means for detecting the position of the measuring probe in the axial direction of the holding shaft; a measurement trajectory determination means for determining a reference trajectory of one revolution of the eyeglass lens based on a lens shape and determining a measurement trajectory having a component that is partially displaced in the radial direction from the reference trajectory; and a control means for controlling the moving means based on the measurement trajectory and acquiring the refractive surface shape of the eyeglass lens in the axial direction of the holding shaft based on the detection result of the detection means. (2) A spectacle lens processing apparatus according to a second aspect of the present disclosure is characterized in that it includes the spectacle lens shape measuring apparatus of (1). (3) A spectacle lens shape measuring program according to a third aspect of the present disclosure includes: a holding means having a holding shaft that holds and rotates a spectacle lens; a measuring probe to be brought into contact with a refractive surface of the spectacle lens; a moving means for relatively changing a positional relationship between the refractive surface of the spectacle lens held by the holding shaft and the measuring probe based on a lens shape; and a detection means for detecting a position of the measuring probe in an axial direction of the holding shaft, and includes: a processing tool provided in a spectacle lens processing apparatus; Grinding and cutting Before processing, the shape of the refractive surface of the eyeglass lens is measured based on the detection result of the detection means. The eyeglass lens processing apparatus is provided withThe present invention is characterized in that the eyeglass lens shape measuring program executed by the eyeglass lens shape measuring device causes the eyeglass lens shape measuring device to execute the following steps: a reference trajectory determination step for determining a reference trajectory for one revolution of the eyeglass lens based on the lens shape; a measurement trajectory determination step for determining a measurement trajectory having a component that is partially displaced in the radial direction from the reference trajectory; and a control step for controlling the moving means based on the measurement trajectory and obtaining the refractive surface shape of the eyeglass lens in the axial direction of the holding shaft based on the detection result of the detection means. [Brief description of the drawings]

[0008] [Figure 1] 2 is a diagram illustrating a configuration of a processing mechanism unit in the eyeglass lens processing apparatus according to the embodiment. FIG. [Diagram 2] 2 is a diagram illustrating a schematic configuration of a lens shape measuring unit included in the eyeglass lens shape measuring device. FIG. [Diagram 3] 2 is a control system block diagram relating to the eyeglass lens processing apparatus and the eyeglass lens shape measuring apparatus. FIG. [Figure 4] 1A and 1B are diagrams illustrating an example of two measurement trajectories in conventional lens shape measurement. [Diagram 5] 1A and 1B are diagrams illustrating an example of a conventional method for determining two measurement trajectories for beveling and grooving. [Figure 6] 1 is an example of a typical measurement trajectory according to an embodiment. [Figure 7] 13A and 13B are diagrams illustrating a fluctuation component caused by a radial shift with respect to a reference trajectory. [Figure 8] 13 is a diagram for explaining a method of projecting an edge radial locus onto a sphere along the axial direction of a holding shaft. FIG. [Figure 9] FIG. 13 is a diagram showing another example of a measurement trajectory. [Figure 10] FIG. 13 is a diagram showing another example of a measurement trajectory. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the present embodiment will be described with reference to the drawings. Figures 1 to 10 are diagrams for explaining the configuration of a spectacle lens shape measuring device according to the present embodiment, a spectacle lens processing device including the same, and a spectacle lens shape measuring program.

[0010] [overview] 1 is a diagram illustrating the configuration of a spectacle lens shape measuring device according to an embodiment of the present disclosure, a spectacle lens processing device including the same, and a spectacle lens shape measuring program.

[0011] For example, the eyeglass lens shape measuring device includes a holding means (e.g., lens holding unit 100) configured to hold an eyeglass lens (hereinafter, lens) LE. For example, the holding means includes a holding shaft (e.g., lens chuck shaft 102) configured to hold the lens LE. For example, the eyeglass lens shape measuring device includes a measuring element (e.g., measuring element 260) that is brought into contact with a refractive surface of the lens LE (at least one of the front surface of the lens having refractive power and the rear surface of the lens). For example, the eyeglass lens shape measuring device includes a moving means (e.g., moving unit 300) that relatively changes the positional relationship between the lens LE held by the holding means and the measuring element. For example, the eyeglass lens shape measuring device includes a detection means (e.g., sensor 280) that detects the position of the measuring element in the axial direction of the holding shaft of the holding means (e.g., the axis L1 direction in FIG. 1). The position of this measuring element is a position relative to a predetermined reference position in the axial direction of the holding shaft (e.g., the position of the front refractive surface of the lens LE on the axis L1). The detection means may include control information (for example, the control unit 50) when the positional relationship in the axial direction between the lens LE and the measuring element is changed by the moving means.

[0012] For example, the eyeglass lens shape measuring device includes an acquisition means (e.g., data acquisition unit 10) that acquires the lens shape (the two-dimensional outer diameter shape of the target lens). For example, the eyeglass lens shape measuring device includes a measurement trajectory determination means (e.g., control unit 50) that determines a measurement trajectory for measuring the shape of the refractive surface of the lens LE based on the lens shape. The measurement trajectory determination means is configured to determine a reference trajectory (e.g., ST1 in FIG. 6) of one revolution of the lens LE based on the lens shape, and to determine the measurement trajectory so as to have a fluctuation component (e.g., Δd in FIG. 7) that is partially fluctuated in the radial direction with respect to the reference trajectory. For example, the measurement trajectory determination means determines a measurement trajectory of one revolution of the lens LE.

[0013] For example, the reference trajectory is a trajectory having a certain relationship with the target lens shape, and is defined by data on the radius vector angle and the radius vector length. For example, the reference trajectory may be the same as the target lens shape, or may be a trajectory that is shifted a certain distance inward or outward with respect to the target lens shape, or the reference trajectory may be a trajectory that is shifted a certain distance inward or outward in the normal direction with respect to each point of the target lens shape. For example, in the case of bevel processing to form a bevel on the lens periphery, the trajectory of the shoulder of the bevel (for example, a trajectory shifted 0.8 mm inward with respect to the target lens shape) may be the reference trajectory. For example, in the case of flat processing to form a groove on the lens periphery, a trajectory that matches the target lens shape may be used. In addition, when the material of the measuring element is hard and there is a risk of scratching the refractive surface of the lens LE, the trajectory may be shifted outward by a certain distance (for example, 0.3 mm) with respect to the trajectory of the bevel shoulder or the trajectory that matches the target lens shape.

[0014] For example, the "variation component changed in the radial direction" is the portion where the radial length of the measurement locus has changed relative to the radial length of the reference locus. For example, the variation component has a distance of 0.3 mm or more in the radial direction from the reference locus so that the inclination of the lens refractive surface at the edge position of the lens can be obtained.

[0015] For example, the measurement trajectory may be a trajectory having a component that is periodically changed in the radial direction with respect to the reference trajectory. This allows the measurement time to be shortened by one revolution measurement while ensuring the measurement accuracy. Also, for example, the measurement trajectory may have at least one of a component that is changed in a curved manner in the radial direction with respect to the reference trajectory and a component that is changed linearly. For example, the measurement trajectory may be a meandering trajectory that meanders with a part having a change component in the radial direction with respect to the reference trajectory. This allows the information on the refractive surface shape of the lens to be obtained with higher accuracy while measuring in one revolution, and also shortens the measurement time.

[0016] For example, the measurement trajectory determination means determines an auxiliary trajectory that is shifted by a certain distance in the radial direction around the entire circumference of the reference trajectory, and determines the measurement trajectory to pass through this auxiliary trajectory. In this way, it is possible to determine the measurement trajectory for ensuring measurement accuracy.

[0017] For example, the eyeglass lens shape measuring device includes a control means (e.g., control unit 50) that controls the moving means based on the measurement trajectory and obtains the refractive surface shape of the lens LE in the holding axis direction of the holding means based on the detection result of the detection means. This makes it possible to obtain the edge position after finishing of the lens LE and the inclination information of the lens refractive surface at the edge position by measuring one revolution of the lens LE, thereby shortening the measurement time compared to the conventional measurement of at least two revolutions.

[0018] For example, the control means obtains a sphere on which the measurement trajectory is located based on the detection result of the detection means, and projects the edge radial trajectory planned after the finishing process of the lens LE onto the obtained sphere, thereby acquiring shape information of the lens refractive surface related to the projected trajectory. For example, the control means obtains edge position information in the axial direction of the holding shaft corresponding to the projected trajectory and inclination information of the lens refractive surface at the edge position as the shape information of the lens refractive surface.

[0019] For example, the eyeglass lens shape measuring device includes a two-round trajectory determining means (e.g., a control unit 50) that determines at least two different measurement trajectories of the lens LE based on the target lens shape, and a selecting means (e.g., a selecting unit 52) ​​that is configured to select a measurement trajectory when the control means controls the moving means, and selects whether the measurement trajectory is the measurement trajectory determined by the measurement trajectory determining means or the measurement trajectory of at least two rounds determined by the two-round trajectory determining means. For example, the two-round trajectory determining means determines a first measurement trajectory of the first trajectory based on the target lens shape, and determines a second measurement trajectory of the second trajectory as a trajectory displaced by a certain distance in the radial direction from the first measurement trajectory. For example, the selecting means may include a signal input means for an operator to input a selection signal, or may be configured such that the selection signal is automatically input by the control means.

[0020] In cases where there is a possibility that measuring the lens shape in one revolution may result in poor accuracy of information such as the inclination of the edge position (for example, when the lens LE has a high degree of astigmatism), by selecting measuring the lens shape in at least two revolutions, it is possible to obtain information that does not result in a decrease in accuracy.

[0021] For example, the eyeglass lens shape measuring device may be provided in an eyeglass lens processing device that processes the periphery of the lens LE using a processing tool. For example, the holding means may be shared with the holding means (e.g., lens holding unit 100) provided in the eyeglass lens processing device. For example, the moving means may be shared with the lens moving means (e.g., moving unit 300) provided in the eyeglass lens processing device.

[0022] In addition, the present disclosure is not limited to the device described in the present embodiment. For example, a spectacle lens shape measuring program (software) that performs the functions of the following embodiments is supplied to a system or device via a network or various storage media. Then, a control device (e.g., a CPU, etc.) of the system or device can read and execute the program.

[0023] For example, the spectacle lens shape measuring program is executed by a spectacle lens shape measuring device that includes a moving means for relatively changing the positional relationship between the lens LE held by the holding means and a measuring element based on the target lens shape, and a detection means for detecting the position of the measuring element in the holding axis direction of the holding means, and measures the shape of the refractive surface of the lens LE based on the detection result of the detection means. For example, the spectacle lens shape measuring program includes a reference trajectory determination step for determining a reference trajectory of one revolution of the lens LE based on the target lens shape. For example, the spectacle lens shape measuring program includes a measurement trajectory determination step for determining a measurement trajectory so as to have a component that is partially displaced in the radial direction with respect to the reference trajectory. For example, the spectacle lens shape measuring program includes a control step for controlling the moving means based on the measurement trajectory, and obtaining the refractive surface shape of the spectacle lens in the holding axis direction of the holding means based on the detection result of the detection means.

[0024] For example, a control step of the eyeglass lens shape measurement program determines a sphere on which the measurement trajectory is located based on the detection result of the detection means, and obtains the refractive surface shape of the lens related to the projected trajectory by projecting the edge radial trajectory planned after finishing processing of the lens LE onto the determined sphere.

[0025] [Example] A typical embodiment of the present disclosure will be described with reference to the drawings. Fig. 1 is a diagram illustrating the configuration of a processing mechanism in an eyeglass lens processing apparatus 1 according to the embodiment. For example, in this embodiment, an eyeglass lens processing apparatus 1 equipped with an eyeglass lens shape measuring apparatus 200 will be described as an example. Fig. 2 is a diagram illustrating the schematic configuration of a lens shape measuring unit 200A equipped in the eyeglass lens shape measuring apparatus 200.

[0026] For example, the eyeglass lens shape measuring device 200 includes a lens holding unit 100, which is an example of a holding means. In this embodiment, the lens holding unit 100 is shared with the holding means included in the eyeglass lens processing device 1. For example, the eyeglass lens shape measuring device 200 includes a lens shape measuring unit 200A provided with a measuring element 260 (261, 262) that is brought into contact with the refractive surface of the lens LE (see FIG. 2). In this embodiment, the lens shape measuring unit 200A is provided on the base 2 of the eyeglass lens processing device 1. For example, the eyeglass lens shape measuring device 200 includes a moving unit 300, which is an example of a moving means. The moving unit 300 is configured to relatively change the positional relationship between the lens LE held by the lens holding unit 100 and the measuring element 260 (261, 262).

[0027] For example, the eyeglass lens processing apparatus 1 includes a first processing tool unit 150. The first processing tool unit 150 is configured to rotate a processing tool that processes the periphery of the lens LE. For example, the eyeglass lens processing apparatus 1 includes a second processing tool unit 400. The second processing tool unit 400 is configured to rotate a processing tool that processes a groove on the periphery of the lens LE. In this embodiment, the moving unit 300 is also used as a moving means provided in the eyeglass lens processing apparatus 1. The moving unit 300 is configured to change (adjust) the relative positional relationship between the lens LE and the processing tool held by the first processing tool unit 150. In addition, the moving unit 300 is configured to change (adjust) the relative positional relationship between the lens LE and the processing tool held by the second processing tool unit 400.

[0028] For example, the lens holding unit 100 includes a lens chuck shaft 102 for holding (clamping) 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 (i.e., the lens LE) is rotated by a motor 120, which is an example of a lens rotating means. In addition, a motor 110 for moving the right chuck shaft 102R toward the left chuck shaft 102L is disposed on the right arm 101R. By moving the right chuck shaft 102R toward the left chuck shaft 102L, the lens LE is held by the two lens chuck shafts 102L and 102R.

[0029] The first 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 base 2 in a positional relationship parallel to the lens chuck shaft 102. A plurality of processing tools 163 for processing the periphery of the lens LE are attached to the processing tool rotation shaft 161. For example, the processing tools 163 include at least one of a rough processing tool 163a for plastics, a finishing processing tool 163b for high-curve lenses, a mirror finish processing tool 163c, a finishing processing tool 163d for low curves, and a rough processing tool 163e for glass. The mirror finish processing tool 163c and the finishing processing tool 163d each include at least one of a V-groove for bevel processing and a flat finishing surface for flat processing. For example, a grindstone is used for the processing tool 163, but a cutter may also be used. The terms "mirror finish", "bevel processing" and "flat processing" are well known to those skilled in the art, so detailed explanations will be omitted.

[0030] For example, the second processing tool unit 400 is disposed behind the carriage 101. The second processing tool unit 400 includes, for example, a groove digging tool 413 for forming a groove on the periphery of the lens LE. The groove digging tool 413 is attached to a rotating shaft 410. The rotating shaft 410 is rotated by a motor 415. The second processing tool unit 400 also includes a hole digging tool 423. The second processing tool unit 400 also includes a chamfering tool (not shown). The hole digging tool 423 and the chamfering tool are rotated by the motor 415 via a rotation transmission mechanism. The second processing tool unit 400 can employ, for example, a configuration described in JP 2017-177234 A, so please refer to this for details. The terms "groove digging", "hole digging", and "chamfering" are well known to those skilled in the art, so detailed explanations will be omitted.

[0031] For example, the moving unit 300 includes a first moving unit 310 that relatively changes the positional relationship in the distance direction between the lens chuck shaft 102 and the tracing stylus 260, and a second moving unit 330 that relatively changes the positional relationship between the lens LE and the tracing stylus 260 in the axis L1 direction of the lens chuck shaft 102. In this embodiment, the axis L1 direction of the lens chuck shaft 102 is defined as the X direction. The direction in which the distance between the lens chuck shaft 102 and the tracing stylus 260 is changed is defined as the Y direction.

[0032] The first moving unit 310 is also used to vary the inter-axial distance between the lens chuck shaft 102 and the processing tool rotation shaft 161 and the rotation shaft 410 when processing the lens LE. The second moving unit 330 is also used to move the lens LE in the axial direction of the lens chuck shaft 102 when processing the lens LE.

[0033] The first moving unit 310 includes a motor 315. The rotation of the motor 315 moves the moving base 301 in the X direction. This causes the carriage 101 and the lens chuck shaft 102 (lens LE) mounted on the moving base 301 to move in the X direction. The first moving unit 310 may be configured to move the stylus 260 in the X direction. Also, the first moving unit 310 may be configured to move the tool rotation shaft 161 in the X direction.

[0034] The second moving unit 330 includes a motor 335 for moving the carriage 101 (lens chuck shaft 102) in the Y direction. A shaft 333 extending in the Y direction is attached to the moving support base 301. A motor 335 is fixed to the moving support base 301. The 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.

[0035] In the embodiment, the second moving unit 330 is configured to move the lens chuck shaft 102 in the Y direction, but may be configured to move the feeler 260 in the Y direction. Also, the processing tool rotation shaft 161 and the rotation shaft 410 may be configured to move in the Y direction.

[0036] 2, for example, the lens shape measuring unit 200A includes a probe 260 to be brought into contact with the refractive surface of the lens LE, which probe 261 is brought into contact with the lens front surface (front refractive surface) and a probe 262 is brought into contact with the lens rear surface (rear refractive surface). The probe 262 may have a cylindrical side surface. The side surface of the probe 262 may be used as a probe to be brought into contact with the outer periphery of the lens LE (demo lens) in order to measure the outer diameter shape of the lens LE.

[0037] For example, the probes 261 and 262 are held by an arm 265 that is movable in the X direction. In this embodiment, the arm 265 has a U-shape. The arm 265 is attached to a support 267, and the support 267 is held by a block 269 so as to be movable in the X direction. For example, in this embodiment, the support 267 is tiltable in the X direction about a support shaft 271 via a bearing 270 held by the block 269. The support 267 is biased in the front and rear directions of the lens by a spring (biasing member) (not shown) with the state of FIG. 2 as a neutral position. The positions of the probes 261 and 262 in the X direction are detected by a sensor (detector) 280, which is an example of a detection means, via the arm 265 and the support 267. A well-known configuration is used for the sensor 280.

[0038] The configuration for holding the tracing stylus 260 (261, 262) movably in the X direction is not limited to the embodiment. For example, the tracing stylus 260 (261, 262) may be held so as to be linearly movable in the X direction. Alternatively, the tracing stylus 261 and the tracing stylus 262 may be held so as to be movable separately in the X direction. In addition, in this device, the shape of the front refracting surface of the lens LE is measured by utilizing the movement control of the lens chuck shaft 102 in the X direction even during measurement, but this is not limited to the above. Alternatively, the lens chuck shaft 102 may not be moved in the X direction during measurement, and the measurement may be performed by detecting a change in the position of the tracing stylus 260 that moves in accordance with a change in the refracting surface of the lens LE. Fig. 3 is a control system block diagram relating to the eyeglass lens processing apparatus 1 and the eyeglass lens shape measuring apparatus 200. The eyeglass lens shape measuring apparatus 200 is equipped with a control unit 50. Electrical components (motors, etc.) of each unit shown in Figs. 1 and 2 are connected to the control unit 50. The control unit 50 also serves as the control unit for the eyeglass lens processing apparatus 1. The control unit 50 is configured to control the entire apparatus. The control unit 50 is also configured to perform various calculations for measuring the refractive surface shape of the lens LE, and various calculations for lens processing.

[0039] For example, the eyeglass lens processing apparatus 1 and the eyeglass lens shape measuring apparatus 200 include a data acquisition unit 10. The data acquisition unit 10 may also function as a data input unit. For example, the data acquisition unit 10 includes a display 12. For example, the data acquisition unit 10 includes a data input unit 13. For example, the display 12 may have a touch panel function and be configured to include the data input unit 13.

[0040] For example, the eyeglass lens processing apparatus 1 and the eyeglass lens shape measuring apparatus 200 include a memory 20, which is an example of a storage means. The memory 20 stores various data acquired by the data acquisition unit 10. The memory 20 also stores various programs for controlling the operations of the eyeglass lens shape measuring apparatus 200 and the eyeglass lens processing apparatus 1. For example, the memory 20 stores a program for measuring the refractive surface shape of the lens LE. The memory 20 also stores a program related to peripheral processing of the lens LE.

[0041] For example, the eyeglass lens shape measuring device 200 includes a selection unit 52, which is an example of a selection means configured to select whether the measurement trajectory is a trajectory performed in one rotation measurement or a trajectory performed in at least two rotation measurement. The selection unit 52 may be configured so that the control unit 50 also functions as the selection unit 52. The selection unit 52 may be configured so as to be included in the data input unit 13.

[0042] The data acquisition unit 10, the memory 20, and the selection unit 52 are connected to the control unit 50. The data acquisition unit 10 may be connected to a lens shape measuring device 30. For example, the lens shape measuring device 30 obtains the lens shape (the target outer diameter 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 be used. The data acquisition unit 10 obtains lens shape data from the lens shape measuring device 30 or the memory 20. The "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 explanation will be omitted.

[0043] <Operation> The operation of the eyeglass lens shape measuring apparatus 200 and eyeglass lens processing apparatus 1 having the above-mentioned configuration will be described.

[0044] First, the lens shape data (radial length r, radial angle θ) of the lens LE is acquired by the data acquisition unit 10. 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 10. The lens shape data may be acquired by the data acquisition unit 10 by calling up the data stored in the memory 20.

[0045] Once the target lens data is acquired, the operator sets (inputs) processing conditions for processing the periphery of the lens LE through the display 12. For example, layout data for locating the optical center position of the lens LE relative to the target lens is input for processing the periphery of the lens LE. For example, the layout data includes the distance FPD between the left and right target lens centers, the interpupillary distance PD, and the height distance of the optical center relative to the target lens center. In addition, the lens material, frame type (metal, cell, rimless, etc.), lens periphery processing type (bevel processing, flat processing, groove processing, etc.), whether or not to perform mirror processing, etc. are input as processing conditions.

[0046] When input of the processing conditions is completed, the operator holds the lens LE on the lens chuck shafts 102 (102L, 102R) and starts the operation of the eyeglass lens processing apparatus 1. 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 apparatus 200 measures the shape of the lens LE.

[0047] The measurement trajectory is determined based on the target lens shape by the control unit 50. For example, the target lens shape is assumed to be circular. For example, the position where the lens chuck shaft 102 chucks the lens LE is set to the frame center (the geometric center of the target lens shape).

[0048] Here, in conventional lens shape measurement, as shown in FIG. 4, two revolutions of a first measurement trajectory CT1 and a second measurement trajectory CT2 are performed on the front and rear refractive surfaces of the lens LE. The first measurement trajectory CT1 and the second measurement trajectory CT2 are different trajectories. For example, the first measurement trajectory CT1 is determined based on the target lens shape, and the second measurement trajectory CT2 is determined as a trajectory displaced by a certain distance in the radial direction from the first measurement trajectory CT1. For example, in the case of bevel processing, as shown in FIG. 5(a), the first measurement trajectory CT1 is set to the position of the bevel shoulder Vs, and the second measurement trajectory CT2 is set to a certain distance outside the first measurement trajectory CT1 (for example, a position 0.8 mm outside that includes the bevel apex Vt). For example, in the case of groove engraving, as shown in FIG. 5(b), the first measurement trajectory CT1 is set to the edge position Lc of the lens LE, and the second measurement trajectory CT2 is set to a certain distance outside the first measurement trajectory CT1 (for example, 0.3 mm outside). Information on the edge position after peripheral processing of the lens LE (after finishing processing) is obtained from the measurement result of the first measurement trajectory CT1, and this information, together with the measurement result of the second measurement trajectory CT2, provides inclination information of the lens surface at the edge position. This allows chamfering to be performed with high accuracy. However, measuring the lens shape for at least two revolutions takes a long measurement time.

[0049] Therefore, in this embodiment, for example, a reference trajectory of one revolution of the lens LE is determined, and a measurement trajectory is determined so as to have a component partially displaced in the radial direction with respect to this reference trajectory, and it is possible to obtain information on the edge position after the peripheral processing of the lens LE and the inclination information of the lens surface at the edge position from the measurement result of one revolution. Note that the following description will be given assuming that the target lens shape data is circular.

[0050] FIG. 6 is an example of a typical measurement trajectory according to the embodiment. The control unit 50 determines a reference trajectory ST1 for one revolution of the lens LE based on target lens data (r, θ). The reference trajectory ST1 is a trajectory having a certain relationship with the target lens shape, and is defined by data on a radius vector angle and a radius vector length. For example, the reference trajectory ST1 may be the trajectory of the target lens shape, or may be a trajectory obtained by shifting a certain distance in the radial direction (inward or outward) relative to the target lens shape. Alternatively, the reference trajectory ST1 may be a trajectory obtained by shifting each point of the target lens shape inward or outward by a certain distance in the normal direction. The reference trajectory ST1 is determined in the same manner as the conventional first measurement trajectory CT1 (see FIG. 4). Next, the control unit 50 determines the measurement trajectory MT so as to have a component that is partially displaced in the radial direction with respect to the reference trajectory ST1. For example, the measurement trajectory MT is determined so as to add a fluctuation component Δd that is sinusoidally displaced in the radial direction with respect to the reference trajectory ST1 (see FIG. 7). For example, the fluctuation component Δd has a distance that allows the inclination of the lens refractive surface at the edge position of the lens to be obtained. For example, the fluctuation component Δd is at least 0.3 mm or more. For practical purposes, it is preferable that it be 0.5 mm or more.

[0051] For example, the measurement trajectory MT may be determined so that a trajectory of a fluctuation component Δd that is periodically fluctuated in the radial direction with respect to the reference trajectory ST1 appears. The example of the measurement trajectory MT in FIG. 6 is an example determined so that the trajectory of the sinusoidal fluctuation component Δd in FIG. 7 appears over the entire circumference at regular intervals, and is also an example of a trajectory that meanders with a fluctuation component in the radial direction with respect to the reference trajectory ST1 in part. The number and period of the fluctuation components Δd may be determined in consideration of the relationship between the measurement accuracy and the measurement speed. The height of the fluctuation component may also be determined in consideration of the relationship between the measurement accuracy and the measurement speed.

[0052] Also, for example, the trajectory of the fluctuation component Δd may be determined so as to pass through an auxiliary trajectory ST2 obtained by varying a fixed distance Δr in the radial direction from the reference trajectory ST1. For example, the fixed distance Δr is determined to be the same distance as the conventional second measurement trajectory CT2 (see FIG. 4). The examples of FIG. 6 and FIG. 7 are examples in which the maximum of the trajectory of the fluctuation component Δd is determined to be located on the auxiliary trajectory ST2.

[0053] The control unit 50 controls the moving unit 300 based on the measurement trajectory MT, and measures the shape of the refractive surface of the lens LE based on the detection result of the sensor 280. For example, first, the shape of the front refractive surface of the lens LE is measured. When starting the measurement of the front refractive surface of the lens LE, the lens chuck shaft 102 is moved in the Y direction based on the measurement trajectory MT, and then the lens chuck shaft 102 is moved in the X direction so that the tracing stylus 261 contacts the front refractive surface of the lens LE. The contact of the tracing stylus 261 with the front refractive surface is detected based on the output of the sensor 280. Then, the lens LE is rotated by the rotation of the lens chuck shaft 102, and the lens chuck shaft 102 is moved in the Y direction based on the measurement trajectory MT. Based on the output of the sensor 280 at this time, the shape of the front refractive surface of the lens LE corresponding to the measurement trajectory MT (shape in the X direction, which is the axis L1 direction of the lens chuck shaft 102) is measured. In this device, the shape of the front refracting surface of the lens LE is measured by controlling the movement of the lens chuck shaft 102 in the X direction even during measurement, and information on the lens shape is obtained by using information on the movement of the lens chuck shaft 102 in the X direction. The shape of the rear refracting surface of the lens LE is measured in the same manner, so a description thereof will be omitted.

[0054] By executing the lens shape measurement, the control unit 50 obtains shape information of the refractive surface of the lens LE. For example, the measurement result of the lens front refractive surface is (mr, mθ, mz). mr is the radial length of the measurement trajectory MT, mθ is the radial angle, and mz is the position data of the lens refractive surface in the axis L1 direction of the lens chuck shaft 102 (distance data relative to a predetermined reference position).

[0055] When the measurement result of the refractive surface shape of the lens LE is obtained, the control unit 50 calculates and obtains the edge position in the axis L1 direction of the lens chuck shaft 102 and the inclination information of the lens refractive surface at the edge position with respect to the edge radial locus KA planned after the finish processing of the lens LE. The edge radial locus KA in this embodiment is the radial information (information of the radial length and the radial angle) of the two-dimensional shape where the edge after the finish processing is located, for example, the conventional first measurement locus CT1. The edge position on the front and rear refractive surfaces of the lens LE corresponding to the edge radial locus KA is obtained, and the edge thickness of the lens LE after the finish processing is obtained. Thereby, in the case of bevel processing, the bevel apex position in the thickness direction (X direction) of the lens LE can be determined, and in the case of groove digging, the groove center position in the thickness direction of the lens LE can be determined. For example, the bevel apex position and the groove center position are determined to be located at a ratio of 3:7 with respect to the thickness of the lens LE.

[0056] A method of obtaining the edge position in the axis L1 direction with respect to the edge radial locus KA and the inclination information of the lens refractive surface at the edge position will be described. For example, the control unit 50 mathematically obtains the sphere Sc (see FIG. 8) on which the measurement locus MT is placed based on the measurement results (mr, mθ, mz) of the lens front refractive surface. For example, any four points are taken from the data of the measurement results (mr, mθ, mz) and a sphere through which these four points pass is obtained. For example, the any four points are points that pass through the geometric center of the measurement locus MT and are located in a direction perpendicular to the geometric center. Then, the method of taking the any four points is changed and a calculation to obtain the sphere is performed multiple times. For example, if there are 1,000 measurement points, a calculation to obtain 250 spheres is performed. Then, the least squares method or the like is used to obtain the radius and center of the most approximate sphere Sc on which the measurement locus MT is placed. Note that the center of the sphere Sc is obtained assuming that it is located on the lens chuck axis 102.

[0057] Once the sphere Sc has been obtained, the edge radial locus KA (radial length, radial angle) is projected onto the sphere Sc along the axis L1 direction of the lens chuck shaft 102, as shown in FIG. 8. The locus projected onto the sphere Sc (edge ​​projection locus) is designated as Kp. This makes it possible to mathematically obtain the edge position in the axis L1 direction corresponding to the locus Kp. In addition, since the radius of the sphere Sc is known, inclination information (i.e., inclination information of the lens refractive surface with respect to the lens chuck shaft 102) at each edge position corresponding to the locus Kp can be obtained. This inclination information is used, for example, to determine the width of the chamfering of the edge of the lens LE.

[0058] With regard to the rear refractive surface of the lens LE, the control unit 50 acquires the edge position in the axis L1 direction with respect to the edge radial locus KA and the inclination information of the lens refractive surface at the edge position in a similar manner.

[0059] As described above, for one of the refractive surfaces of the lens LE, information required for processing the lens LE (for example, the edge position after finishing processing and the inclination information of the lens surface at that edge position) can be obtained by measuring the lens shape in one revolution, so the measurement time can be shortened compared to the conventional measurement of two or more revolutions. Also, it becomes possible to obtain more measurement data in the measurement time for one revolution than in the conventional one-revolution measurement, improving the accuracy of the information required for processing.

[0060] In addition, if the target lens shape is rectangular and the radius length (the radius length based on the geometric center of the target lens shape) varies greatly depending on the radius angle, it may be possible to estimate the sphere Sc shown in FIG. 8 by only measuring one revolution (for example, the first measurement trajectory CT1) out of the conventional two revolution measurements. However, if the target lens shape is close to a sphere, the estimation accuracy of the sphere Sc decreases, and the accuracy of the edge position information (the edge position in the axis L1 direction and the inclination information at the edge position) planned after finishing decreases. In contrast, if the method for determining the measurement trajectory of this embodiment is used, measurement data equivalent to two revolutions can be obtained in the measurement time of one revolution, and the accuracy of the edge position information is improved.

[0061] In addition, when the lens LE has a high degree of astigmatism, the posterior refractive surface becomes an aspheric shape deviating from a spherical surface. In this case, the accuracy of the edge position and inclination information of the trajectory Kp obtained based on the above-mentioned sphere Sc may decrease. In such a case, the selection unit 52, which is an example of a selection means, may be made selectable so that at least two-round measurement of the lens can be performed. For example, the measurement trajectories of the two rounds are determined by the control unit 50 as different trajectories based on the target lens shape. For example, like the measurement trajectories C1 and CT2 of the conventional two-round measurement, the first measurement trajectory of the first round is determined based on the target lens shape, and the second measurement trajectory of the second round is determined as a trajectory that is displaced by a certain distance in the radial direction from the first measurement trajectory.

[0062] For example, a selection switch for allowing an operator to input a selection signal is provided in the selection unit 52, and when a signal is input from this selection switch, the control unit 50 executes two-round measurement. This selection signal may also be input automatically by the control unit 50. For example, the cylindrical power of the lens LE is input by the data input unit 13, and the control unit 50 selects whether to perform one-round measurement or two-round measurement based on the cylindrical power.

[0063] Furthermore, it may be possible to select two-round measurement of the lens when the target lens shape is closer to a circle than a certain reference. For example, depending on the setting of the fluctuation component Δd of the measurement trajectory MT with respect to the reference trajectory ST1, if the target lens shape is too close to a circle, the accuracy of acquiring edge position information may be poor. For example, the target lens shape is close to a circle when the difference between the maximum and minimum values ​​of the radius length with respect to the geometric center of the target lens shape is equal to or less than a predetermined value, and in this case, it may be possible to select two-round measurement with the selection unit 52 (at least one of manual selection by the operator and automatic selection by the control unit 50).

[0064] When the shape information expected after the finish processing of the lens LE is obtained, the peripheral processing of the lens LE is performed. The peripheral processing of the lens LE will be briefly described. The case of bevel processing will be described below. First, rough processing is performed. The control unit 50 acquires rough processing data based on the target lens shape, controls the moving unit 300 based on the rough processing data, and roughly processes the lens LE with the rough processing tool 163a. ​​Next, the bevel finishing is performed. The control unit 50 calculates the bevel trajectory (radius information and information on the position of the bevel apex in the axis L1 direction) based on the shape information expected after the finish processing of the lens LE, controls the moving unit 300 based on this, and the peripheral edge of the lens LE after the rough processing is beveled with the finishing processing tool 163d. If there is chamfering, the moving unit 300 is controlled based on the edge position information of the trajectory Kp and the inclination information at the edge position, and the edge of the lens LE is chamfered with the chamfering tool held by the second processing tool unit 400.

[0065] The measurement trajectory MT in FIG. 6 described above is merely an example. FIG. 9 and FIG. 10 are diagrams showing other examples of the measurement trajectory MT. FIG. 9(a) is an example in which the trajectory of the fluctuation component Δd changes linearly compared to the example in FIG. 6. FIG. 9(b) is an example in which the measurement trajectory MT is determined such that a part of the trajectory follows the reference trajectory ST1, a part of the trajectory follows the auxiliary trajectory ST2, and the two are connected by a straight line or a curve. Also, FIG. 9(a) and FIG. 9(b) are examples in which the trajectory of the fluctuation component Δd appears periodically. Note that, when multiple fluctuation components Δd appear, their heights (radial distance from the reference trajectory ST1) may differ depending on the location.

[0066] In addition, even if the target target shape (reference trajectory ST1) is circular, if at least a part of the target target shape has a component that has changed in the radial direction from the circular shape, the target target trajectory MT can be obtained in principle, so it is not necessary to make the target target trajectory appear periodically. For example, as shown in FIG. 9(c), it is also possible that only one trajectory of the change component Δd appears for the reference trajectory ST1.

[0067] Moreover, Figure 9(d) shows an example in which two trajectories of the fluctuation component Δd appear, where in one of the fluctuation components Δd, 1 / 4 of the measurement trajectory MT is a trajectory having a fluctuation component along the auxiliary trajectory ST2, and the second fluctuation component Δd is arranged symmetrically at 180 degrees.

[0068] FIG. 10 shows an example of a measurement trajectory MT in which the fluctuation component Δd coincides with the auxiliary trajectory ST2 at four points of radial angles of 0 degrees, 90 degrees, 180 degrees, and 270 degrees on the measurement trajectory MT, and coincides with the reference trajectory ST1 at four points of radial angles of 45 degrees, 135 degrees, 225 degrees, and 315 degrees, with each point being connected by a curve.

[0069] In this way, the measurement trajectory MT may have various patterns, and may have a component Δd that is partially displaced in the radial direction from the reference trajectory ST1. At least one displacement component Δd may be present, and preferably multiple displacement components may be present.

[0070] 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]

[0071] 1 Eyeglass lens processing equipment 50 Control Unit 52 Selection Units 100 Lens holding unit 150 First processing tool unit 102 Lens chuck axis 200 Eyeglass lens shape measuring device 200A Lens Shape Measurement Unit 260 Probe 280 Sensors 300 Mobile Units ST1 Reference trajectory MT measurement trajectory Δd Fluctuation component

Claims

1. A spectacle lens shape measuring device that is configured to measure the shape of a refractive surface of a spectacle lens based on a target lens shape before grinding or cutting the peripheral edge of the spectacle lens using a processing tool provided in the spectacle lens processing device, and is provided in the spectacle lens processing device, A holding means having a holding shaft that holds and rotates the eyeglass lens; A measuring element to be brought into contact with a refractive surface of the eyeglass lens; a moving means for relatively changing a positional relationship between a refractive surface of the eyeglass lens held by the holding shaft and the measuring element; a detection means for detecting a position of the measuring element in an axial direction of the holder shaft; A measurement trajectory determination means for determining a reference trajectory of one revolution of the eyeglass lens based on the lens shape, and determining a measurement trajectory so as to have a component partially displaced in a radial direction from the reference trajectory; a control means for controlling the moving means based on the measurement trajectory and acquiring a refractive surface shape of the eyeglass lens in the axial direction of the holding shaft based on a detection result of the detection means; An eyeglass lens shape measuring device comprising:

2. 2. The eyeglass lens shape measuring device according to claim 1, wherein the measurement locus is a locus having a component that is periodically displaced in a radial direction with respect to the reference locus.

3. 3. The eyeglass lens shape measuring device according to claim 1, wherein the measurement locus has at least one of a component that is curvedly displaced in a radial direction relative to the reference locus and a component that is linearly displaced.

4. In any one of claims 1 to 3, the measurement trajectory determination means determines an auxiliary trajectory that is varied by a certain distance in a radial direction around the entire circumference of the reference trajectory, and determines the measurement trajectory so as to pass through the auxiliary trajectory.

5. An eyeglass lens processing apparatus comprising the eyeglass lens shape measuring device according to any one of claims 1 to 4.

6. A spectacle lens shape measuring program executed by a spectacle lens shape measuring device provided in the spectacle lens processing apparatus, the spectacle lens shape measuring program comprising: a holding means having a holding shaft which holds and rotates a spectacle lens; a measuring element which is brought into contact with a refractive surface of the spectacle lens; a moving means which changes the positional relationship between the refractive surface of the spectacle lens held by the holding shaft and the measuring element based on a lens shape; and a detection means which detects the position of the measuring element in the axial direction of the holding shaft, the spectacle lens shape measuring program being configured to measure the shape of the refractive surface of the spectacle lens based on a detection result of the detection means before grinding or cutting the peripheral edge of the spectacle lens with a processing tool provided in the spectacle lens processing apparatus, the program comprising: A reference trajectory determination step of determining a reference trajectory of one revolution of the eyeglass lens based on the lens shape; a measurement trajectory determination step of determining a measurement trajectory so as to have a component partially displaced in a radial direction with respect to the reference trajectory; a control step of controlling the moving means based on the measurement trajectory and obtaining a refractive surface shape of the eyeglass lens in the axial direction of the holding shaft based on a detection result of the detection means; A spectacle lens shape measuring program that causes a spectacle lens shape measuring device to execute the above.

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