JP2021133465A - Spectacle lens shape measuring apparatus, spectacle lens processing apparatus comprising the same, and spectacle lens shape measuring program - Google Patents

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

The present disclosure relates to a spectacle lens shape measuring device for measuring the shape of the refracting surface of the spectacle lens, a spectacle lens processing device including the spectacle lens shape measuring device, and a spectacle lens shape measuring program for measuring the shape of the refracting surface of the spectacle lens.

An spectacle lens shape measuring device for measuring the shape of the refracting surface (front surface of the lens having a refractive force and the rear surface of the lens) of the spectacle lens is provided in, for example, a spectacle lens processing device for processing the peripheral edge of the spectacle lens with a processing tool. The spectacle lens shape measuring device has a stylus that comes into contact with the anterior refracting surface (front surface of the lens) and the posterior refracting surface (rear surface of the lens) of the spectacle lens (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2014-004678

In the measurement of the refraction surface of the lens by the spectacle lens shape measuring device, for example, the lens is rotated once while the stylus is in contact with the refraction surface based on the lens shape (the outer diameter shape of the target lens) to hold the spectacle lens. This is done by detecting the position of the stylus in the axial direction of the lens chuck axis. In order to obtain edge position information (edge position according to the lens shape and inclination information of the refracting surface at the edge position, etc.) scheduled after finishing the lens in peripheral processing of the spectacle lens, conventionally, one is used. The refracting surface was measured at least twice (two times) with different measurement trajectories.

However, there is a problem that the measurement time becomes long when the measurement is performed twice (two times) for one refracting surface.

In view of the above-mentioned prior art, it is a technical subject of the present disclosure to shorten the measurement time of the shape of the refracting surface of the lens.

In order to solve the above problems, the present invention is characterized by having the following configurations.
(1) The spectacle lens shape measuring device according to the first aspect of the present disclosure is a spectacle lens shape measuring device that measures the shape of the refracting surface of the spectacle lens based on a lens shape, and serves as a holding means for holding the spectacle lens. , A stylus that comes into contact with the refractive plane of the spectacle lens, a moving means that relatively changes the positional relationship between the spectacle lens held by the holding means and the stylus, and the measurement in the holding axial direction of the holding means. A detection means for detecting the position of the child and a reference locus for one circumference of the spectacle lens are determined based on the lens shape, and the measurement locus has a component partially changed in the radial direction with respect to the reference locus. A measurement locus determining means for determining the above, and a control means for controlling the moving means based on the measurement locus and acquiring the shape of the refractory surface of the spectacle lens in the holding axis direction of the holding means based on the detection result of the detecting means. It is characterized by having and.
(2) The spectacle lens processing apparatus according to the second aspect of the present disclosure is characterized by including the spectacle lens shape measuring apparatus of (1).
(3) The spectacle lens shape measuring program according to the third aspect of the present disclosure includes a moving means that relatively changes the positional relationship between the spectacle lens held by the holding means and the stylus based on the lens shape, and the holding means. A spectacle lens executed by a spectacle lens shape measuring device including a detecting means for detecting the position of a stylus in the holding axis direction of the means and measuring the shape of the refracting surface of the spectacle lens based on the detection result of the detecting means. It is a shape measurement program and has a reference locus determination step for determining a reference locus around one circumference of a spectacle lens based on a lens shape, and a component partially changed in the radial direction with respect to the reference locus. A measurement locus determination step for determining a measurement locus and a control for controlling the moving means based on the measurement locus and obtaining the shape of the refracting surface of the spectacle lens in the holding axis direction of the holding means based on the detection result of the detecting means. It is characterized in that the step and the spectacle lens shape measuring device are executed.

It is a figure explaining the structure of the processing mechanism part in the spectacle lens processing apparatus which concerns on Example. It is a figure explaining the schematic structure of the lens shape measuring unit included in the spectacle lens shape measuring apparatus. It is a control system block diagram concerning the spectacle lens processing apparatus and the spectacle lens shape measuring apparatus. It is a figure explaining the example of the measurement locus of two rounds in the conventional lens shape measurement. It is a figure explaining the example of the method of determining the measurement locus of two rounds in the case of the conventional bevel processing and the case of grooving processing. This is an example of a typical measurement trajectory according to an embodiment. It is a figure explaining the fluctuation component which changed in the radial direction with respect to the reference locus. It is a figure explaining the method of projecting an edge radial trajectory on a sphere along an axial direction of a holding axis. It is a figure which shows another example of a measurement locus. It is a figure which shows another example of a measurement locus.

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

[Overview]
It is a figure explaining the structure of the spectacle lens shape measuring apparatus which concerns on embodiment of this disclosure, the spectacle lens processing apparatus provided with this, and the spectacle lens shape measuring program.

For example, the spectacle lens shape measuring device includes a holding means (for example, a lens holding unit 100) configured to hold the spectacle lens (hereinafter, lens) LE. For example, the holding means includes a holding shaft (for example, a lens chuck shaft 102) configured to hold the lens LE. For example, the spectacle lens shape measuring device includes a stylus (for example, stylus 260) that comes into contact with the refracting surface of the lens LE (at least one of the front surface and the rear surface of the lens having a refractive power). For example, the spectacle lens shape measuring device includes a moving means (for example, a moving unit 300) that relatively changes the positional relationship between the lens LE held by the holding means and the stylus. For example, the spectacle lens shape measuring device includes a detecting means (for example, a sensor 280) for detecting the position of the stylus in the axial direction of the holding shaft of the holding means (for example, the axis L1 direction in FIG. 1). The position of the stylus is a position with respect to a predetermined reference position in the axial direction of the holding shaft (for example, the position of the front refracting surface of the lens LE on the shaft L1). The detecting means may include control information (for example, the control unit 50) when changing the positional relationship between the lens LE and the stylus in the axial direction by the moving means.

For example, the spectacle lens shape measuring device includes an acquisition means (for example, a data acquisition unit 10) for acquiring a lens shape (two-dimensional outer diameter shape of a target lens). For example, the spectacle lens shape measuring device includes a measuring locus determining means (for example, a control unit 50) for determining a measuring locus for measuring the shape of the refracting surface of the lens LE based on the lens shape. The measurement locus determining means determines a reference locus (for example, ST1 in FIG. 6) around the lens LE based on the lens shape, and a variable component (for example, ST1 in FIG. 6) that is partially varied in the radial direction with respect to the reference locus. , It is configured to determine the measurement locus so as to have Δd) in FIG. For example, the measurement locus determining means determines the measurement locus of one round of the lens LE.

For example, the reference locus is a locus having a certain relationship with the lens shape, and is defined by the data of the radius angle and the radius length. For example, the reference locus may be the same locus as the ball shape, may be a locus in which a certain distance is changed inward or outward with respect to the ball shape, or the reference locus may be a ball shape. It may be a locus in which a certain distance is changed inward or outward in the normal direction with respect to each point of. For example, in the case of bevel processing in which a bevel is formed on the peripheral edge of the lens, the locus of the shoulder of the bevel (for example, a locus changed 0.8 mm inward with respect to the lens shape) may be used as a reference locus. For example, when flattening is performed to form a groove on the peripheral edge of the lens, the locus may match the shape of the lens. If the material of the stylus is hard and there is a risk that the refracting surface of the lens LE will be scratched, a certain distance (for example, 0.3 mm) will be applied to the trajectory of the shoulder of the bevel or the trajectory that matches the shape of the lens. ) May be a locus that is varied outward.

For example, the "variable component varied in the radial direction" is a portion in which the radial length of the measurement locus fluctuates with respect to the radial length of the reference locus. For example, the variable 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 refracting surface at the edge position of the lens can be obtained.

For example, the measurement locus may be a locus having a component periodically changed in the radial direction with respect to the reference locus. As a result, the measurement time can be shortened in one round of measurement while ensuring the measurement accuracy. Further, for example, the measurement locus may have at least one of a component that is curvedly changed in the radial direction and a component that is linearly changed with respect to the reference locus. For example, the measurement locus may be a meandering locus in which a part of the measurement locus meanders with a variable component in the radial direction with respect to the reference locus. As a result, the information on the shape of the refracting surface of the lens can be acquired more accurately and the measurement time can be shortened even though the measurement is performed once.

For example, the measurement locus determining means determines an auxiliary locus in which a constant distance is varied in the radial direction with respect to the reference locus over the entire circumference, and determines the measurement locus so as to pass through the auxiliary locus. Thereby, the measurement locus for ensuring the measurement accuracy can be determined.

For example, the spectacle lens shape measuring device controls the moving means based on the measurement locus, and obtains the refracting surface shape of the lens LE in the holding axis direction of the holding means based on the detection result of the detecting means (for example, a control unit). 50) is provided. This makes it possible to obtain the edge position of the lens LE after finishing and the inclination information of the lens refracting surface at the edge position by measuring one circumference of the lens LE, so that the measurement time is longer than that of the conventional measurement of at least two circumferences. Can be shortened.

For example, the control means obtains a sphere on which the measurement locus is placed based on the detection result of the detection means, and projects the edge radial trajectory scheduled after the finishing process of the lens LE on the obtained sphere, thereby refracting the lens with respect to the projected locus. Acquire surface shape information. For example, the control means acquires the edge position information in the axial direction of the holding axis corresponding to the projected locus and the inclination information of the lens refracting surface at the edge position as the shape information of the lens refracting surface.

For example, the spectacle lens shape measuring device includes a two-circle locus determining means (for example, a control unit 50) that determines different measurement loci of at least two rounds of the lens LE based on a lens shape, and when the control means controls the moving means. The selection means (for example, the selection unit 52) configured to select the measurement locus of the above, and the measurement locus is the measurement locus determined by the measurement locus determining means, or is determined by the two-round locus determining means. It is provided with a selection means for selecting whether or not the measurement trajectory is at least two laps. For example, the two-lap locus determining means determines the first measurement locus of the first lap based on the lens shape, and fluctuates the second measurement locus of the second lap by a certain distance in the radial direction with respect to the first measurement locus. Determined as the trajectory that was made. For example, the selection means may include a signal input means for the operator to input the selection signal, or may have a configuration in which the selection signal is automatically input by the control means.

If there is a possibility that the accuracy of the edge position tilt information etc. may deteriorate in the lens shape measurement of one circumference (for example, when the lens LE has the altitude number of astigmatism), select the lens shape measurement of at least two circumferences. By doing so, it is possible to obtain information that does not cause a decrease in accuracy.

For example, the spectacle lens shape measuring device may be provided in the spectacle lens processing device that processes the peripheral edge of the lens LE with a processing tool. For example, the holding means may be shared with the holding means (for example, the lens holding unit 100) included in the spectacle lens processing apparatus. For example, the moving means may be shared with the lens moving means (for example, the moving unit 300) included in the spectacle lens processing apparatus.

The present disclosure is not limited to the apparatus described in the present embodiment. For example, a spectacle lens shape measurement program (software) that performs the functions of the following embodiments is supplied to a system or an apparatus via a network or various storage media. Then, a system or a control device of the device (for example, a CPU or the like) can read and execute the program.

For example, the spectacle lens shape measurement program includes a moving means that relatively changes the positional relationship between the lens LE held by the holding means and the stylus based on the lens shape, and a stylus in the holding axis direction of the holding means. It is executed by a spectacle lens shape measuring device that includes a detecting means for detecting a position and measures the shape of the refracting surface of the lens LE based on the detection result of the detecting means. For example, the spectacle lens shape measurement program includes a reference locus determination step for determining a reference locus for one round of the lens LE based on the lens shape. For example, the spectacle lens shape measurement program includes a measurement locus determination step of determining a measurement locus so as to have a component partially varied in the radial direction with respect to a reference locus. For example, the spectacle lens shape measurement program includes a control step of controlling the moving means based on the measurement locus and obtaining the shape of the refracting surface of the spectacle lens in the holding axis direction of the holding means based on the detection result of the detecting means.

For example, in the control step of the spectacle lens shape measurement program, a sphere on which the measurement trajectory is placed is obtained based on the detection result of the detection means, and the edge radial trajectory scheduled after the finishing process of the lens LE is projected on the obtained sphere. Obtain the shape of the refracting surface of the lens with respect to the projected trajectory.

[Example]
One of the typical embodiments of the present disclosure will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of a processing mechanism portion in the spectacle lens processing apparatus 1 according to the embodiment. For example, in this embodiment, the spectacle lens processing device 1 including the spectacle lens shape measuring device 200 will be described as an example. FIG. 2 is a diagram illustrating a schematic configuration of a lens shape measuring unit 200A included in the spectacle lens shape measuring device 200.

For example, the spectacle lens shape measuring device 200 includes a lens holding unit 100 which is an example of holding means. In this embodiment, the lens holding unit 100 is shared with the holding means included in the spectacle lens processing device 1. For example, the spectacle lens shape measuring device 200 includes a lens shape measuring unit 200A provided with a stylus 260 (261,262) that comes into contact with the refracting 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 spectacle lens processing device 1. For example, the spectacle lens shape measuring device 200 includes a moving unit 300 which is an example of 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 stylus 260 (261,262).

For example, the spectacle lens processing device 1 includes a first processing tool unit 150. The first processing tool unit 150 is configured to rotate the processing tool that processes the peripheral edge of the lens LE. For example, the spectacle lens processing device 1 includes a second processing tool unit 400. The second processing tool unit 400 is configured to rotate a processing tool or the like for processing a groove on the peripheral edge of the lens LE. In this embodiment, the moving unit 300 is shared with the moving means included in the spectacle lens processing device 1. The moving unit 300 is configured to change (adjust) the relative positional relationship between the lens LE and the processing tool of the first processing tool unit 150. Further, the moving unit 300 is configured to change (adjust) the relative positional relationship between the lens LE and the processing tool of the second processing tool unit 400.

For example, the lens holding unit 100 includes a lens chuck shaft 102 for holding (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 (that is, the lens LE) is rotated by a motor 120, which is an example of a lens rotating means. Further, a motor 110 for moving the right chuck shaft 102R to the left chuck shaft 102L side is arranged on the right arm 101R. By moving the right chuck shaft 102R to the left chuck shaft 102L side, the lens LE is held by the two lens chuck shafts 102L and 102R.

The first machining tool unit 150 includes a motor 160 for rotating the machining tool rotation shaft 161. The processing tool rotation shaft 161 is rotatably held by the base 2 in a positional relationship parallel to the lens chuck shaft 102. A plurality of processing tools 163 for processing the peripheral edge of the lens LE are attached to the processing tool rotation shaft 161. For example, the processing tool 163 is at least one of a roughing tool 163a for plastic, a finishing tool 163b for a high curve lens, a mirror finishing tool 163c, a finishing tool 163d for low curve, and a roughing tool 163e for glass. It has any one. The mirror-finishing tool 163c and the finishing tool 163d each include at least one of a V-groove for beveling and a flat-finished surface for flattening. For example, a grindstone is used for the processing tool 163, but a cutter may be used. Since the terms "mirror finish", "brush processing", and "flat processing" are well known to those skilled in the art, detailed description thereof will be omitted.

For example, the second processing tool unit 400 is arranged behind the carriage 101. The second processing tool unit 400 includes, for example, a grooving processing tool 413 for forming a groove on the peripheral edge of the lens LE. The grooving tool 413 is attached to the rotating shaft 410. The rotating shaft 410 is rotated by the motor 415. Further, the second processing tool unit 400 includes a hole processing tool 423. Further, the second processing tool unit 400 includes a chamfering processing tool (not shown). The hole drilling tool 423 and the chamfering tool are rotated by the motor 415 via a rotation transmission mechanism. As the second processing tool unit 400, for example, the configuration described in JP-A-2017-177234 can be adopted, so refer to this for details. The terms "grooving", "hole drilling", and "chamfering" are well known to those skilled in the art, and detailed description thereof will be omitted.

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

The first moving unit 310 is also used to change the distance between the lens chuck shaft 102, the tool rotating shaft 161 and the rotating shaft 410 during processing of 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 during processing of the lens LE.

The first moving unit 310 includes a motor 315. The movement support 301 is moved in the X direction by the rotation of the motor 315. As a result, the carriage 101 and the lens chuck shaft 102 (lens LE) mounted on the moving support base 301 are moved in the X direction. The configuration of the first moving unit 310 may be such that the stylus 260 is moved in the X direction. Further, the processing tool rotation shaft 161 may be moved in the X direction.

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 the 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.

In the embodiment, the second moving unit 330 is configured to move the lens chuck shaft 102 in the Y direction, but the stylus 260 may be moved in the Y direction. Further, the processing tool rotation shaft 161 and the rotation shaft 410 may be moved in the Y direction.

In FIG. 2, for example, the lens shape measuring unit 200A is in contact with the stylus 261 in contact with the front surface (front refraction surface) of the lens and the rear surface (rear refraction surface) of the lens as the stylus 260 in contact with the refraction surface of the lens LE. It is provided with a stylus 262 and a stylus 262. The stylus 262 may have a cylindrical side surface. The side surface of the stylus 262 may be used as a stylus that is in contact with the outer circumference of the lens LE (demo lens) in order to measure the outer diameter shape of the lens LE.

For example, the stylus 261 and 262 are held by an arm 265 that can move in the X direction. In this embodiment, the arm 265 has a U-shaped shape. Further, the arm 265 is attached to the support column 267, and the support column 267 is held by the block 269 so as to be movable in the X direction. For example, in the embodiment, the support column 267 can be tilted in the X direction about the support shaft 271 via the bearing 270 held by the block 269. The support column 267 is urged by a spring (a urging member) (not shown) in the front side direction and the rear side side direction of the lens, respectively, with the state shown in FIG. 2 as the neutral position. The positions of the stylus 261 and 262 in the X direction are detected by the sensor (detector) 280, which is an example of the detection means, via the arm 265 and the support column 267. A well-known configuration of the sensor 280 is used.

The configuration for holding the stylus 260 (261, 262) so as to be movable in the X direction is not limited to the embodiment. For example, the stylus 260 (261, 262) may be held so as to be linearly movable in the X direction. Further, the stylus 261 and the stylus 262 may be separately held so as to be movable in the X direction. Further, in this apparatus, the shape of the front refracting surface of the lens LE is measured by using the movement control of the lens chuck shaft 102 in the X direction during the measurement, but the present invention is not limited to this. The lens chuck shaft 102 may not move in the X direction during the measurement, and the measurement may be performed by detecting a change in the position of the stylus 260 that moves with a change in the refracting surface of the lens LE. FIG. 3 is a control system block diagram relating to the spectacle lens processing device 1 and the spectacle lens shape measuring device 200. The spectacle lens shape measuring device 200 includes a control unit 50. The control unit 50 is connected to the electrical system components (motors and the like) of each unit shown in FIGS. 1 and 2. The control unit 50 also serves as a control unit for the spectacle lens processing device 1. The control unit 50 is configured to control the entire device. Further, the control unit 50 is configured to perform various calculations for measuring the shape of the refracting surface of the lens LE and various calculations for processing the lens.

For example, the spectacle lens processing device 1 and the spectacle lens shape measuring device 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 may be configured to include a data input unit 13.

For example, the spectacle lens processing device 1 and the spectacle lens shape measuring device 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. Further, the memory 20 stores various programs for controlling the operations of the spectacle lens shape measuring device 200 and the spectacle lens processing device 1. For example, the memory 20 stores a program for measuring the shape of the refracting surface of the lens LE. Further, the memory 20 stores a program related to peripheral processing of the lens LE.

For example, the spectacle lens shape measuring device 200 is an example of a selection unit configured to select whether the measurement locus is a locus performed by one-lap measurement or a locus performed by at least two-lap measurement. 52 is provided. The selection unit 52 may be configured so that the control unit 50 also serves as the selection unit 52. The selection unit 52 may be configured to be included in the data input unit 13.

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 the ball shape measuring device 30. For example, the lens shape measuring device 30 measures the rim of the spectacle frame to obtain a lens LE lens shape (target outer diameter shape for peripheral processing of the lens). Further, as the lens shape, the one stored in the memory 20 may be used. The data acquisition unit 10 acquires the ball shape data from the ball shape measuring device 30 or the memory 20. The "ball shape" is a two-dimensional shape defined by the radius length and the radius angle, and is obvious and well known to those skilled in the art, so detailed description thereof will be omitted.

<Operation>
The operation of the spectacle lens shape measuring device 200 and the spectacle lens processing device 1 having the above configuration will be described.

First, the data acquisition unit 10 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 spectacle frame measured by the ball shape measuring device 30 is input to the data acquisition unit 10. The ball-shaped data may be acquired by the data acquisition unit 10 by recalling the data stored in the memory 20.

When the lens shape data is acquired, the operator sets (inputs) the processing conditions for processing the peripheral edge of the lens LE on the display 12. For example, layout data for arranging the optical center position of the lens LE with respect to the lens shape is input for peripheral processing of the lens LE. For example, the layout data includes the left and right lens-shaped center distance FPD, the interpupillary distance PD, and the height distance of the optical center with respect to the lens-shaped center. In addition, as processing conditions, the lens material, frame type (metal, cell, rimless, etc.), lens peripheral processing type (bevel processing, flat processing, groove processing, etc.), presence / absence of mirror surface processing, etc. are input. Will be done.

When the input of the processing conditions is completed, the operator holds the lens LE on the lens chuck shaft 102 (102L, 102R) and starts the operation of the spectacle lens processing device 1. Prior to the peripheral processing of the lens LE, the spectacle lens shape measurement program is executed by the control unit 50, and the shape of the lens LE is measured by the spectacle lens shape measuring device 200.

The control unit 50 determines the measurement trajectory based on the lens shape. For example, assume that the lens shape is circular. For example, the position where the lens LE is chucked by the lens chuck shaft 102 is set to the center of the frame (the geometric center of the lens).

Here, in the conventional lens shape measurement, as shown in FIG. 4, two rounds of the first measurement locus CT1 and the second measurement locus CT2 are measured on the front refraction surface and the back refraction surface of the lens LE, respectively. .. The first measurement locus CT1 and the second measurement locus CT2 are different loci. For example, the first measurement locus CT1 is determined based on the lens shape, and the second measurement locus CT2 is determined as a locus that fluctuates in the radial direction by a certain distance with respect to the first measurement locus CT1. For example, in the case of bevel processing, as shown in FIG. 5A, the first measurement locus CT1 is set to the position of the bevel shoulder Vs, and the second measurement locus CT2 is a certain distance outside the first measurement locus CT1 (for example, 0. At a position 8 mm outside, the position including the bevel apex Vt) was defined. For example, in the case of grooving, as shown in FIG. 5B, the first measurement locus CT1 is set to the edge position Lc of the lens LE, and the second measurement locus CT2 is a certain distance outside the first measurement locus CT1 (for example,). It was supposed to be 0.3 mm outside). Information on the edge position after peripheral processing (after finishing processing) of the lens LE is obtained from the measurement result of the first measurement trajectory CT1, and the inclination of the lens surface at the edge position is obtained from this and the measurement result of the second measurement trajectory CT2. Information is available. As a result, chamfering can be performed with high accuracy. However, the measurement time of the lens shape measurement of at least two laps was prolonged.

Therefore, in this embodiment, for example, the reference locus of one round of the lens LE is determined, the measurement locus is determined so as to have a component partially varied in the radial direction with respect to the reference locus, and one round is determined. It is possible to obtain information on the edge position after peripheral processing of the lens LE and information on the inclination of the lens surface at the edge position from the measurement result of. In the following, it will be described assuming that the lens shape data is circular.

FIG. 6 is an example of a typical measurement locus according to the embodiment. The control unit 50 determines the reference locus ST1 for one round of the lens LE based on the lens shape data (r, θ). The reference locus ST1 is a locus having a certain relationship with the lens shape, and is defined by the data of the radius angle and the radius length. For example, the reference locus ST1 may be a ball-shaped locus, or may be a locus in which a certain distance is varied in the radial direction (inside or outside) with respect to the ball shape. Alternatively, the reference locus ST1 may be a locus in which a certain distance is varied inward or outward in the normal direction with respect to each point of the lens shape. The reference locus ST1 is determined in the same manner as the conventional first measurement locus CT1 (see FIG. 4). Next, the control unit 50 has a component partially changed in the radial direction with respect to the reference locus ST1. The measurement trajectory MT is determined. For example, the measurement locus MT is determined to add a fluctuation component Δd that fluctuates in a sinusoidal shape in the radial direction to the reference locus ST1 (see FIG. 7). For example, the fluctuation component Δd has a distance at which the inclination of the lens refracting surface at the edge position of the lens can be obtained. For example, the variable component Δd is at least 0.3 mm or more. Practically, it should be 0.5 mm or more.

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

Further, for example, the locus of the fluctuation component Δd may be determined to pass through the auxiliary locus ST2 in which the reference locus ST1 is varied by a constant distance Δr in the radial direction. For example, the constant distance Δr is defined by the same distance as the conventional second measurement locus CT2 (see FIG. 4). In the examples of FIGS. 6 and 7, the maximum locus of the variable component Δd is determined to be located in the auxiliary locus ST2.

The control unit 50 controls the moving unit 300 based on the measurement locus MT, and measures the shape of the refracting surface of the lens LE based on the detection result of the sensor 280. For example, first, the shape of the anterior refracting surface of the lens LE is measured. At the start of measurement of the front refraction surface of the lens LE, the lens chuck shaft 102 is moved in the Y direction based on the measurement locus MT, and then the lens chuck shaft 102 is brought into contact with the stylus 261 so that the stylus 261 comes into contact with the front refraction surface of the lens LE. It is moved in the X direction. The contact of the stylus 261 with the anterior refracting 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 locus MT. Based on the output of the sensor 280 at this time, the shape of the front refracting surface of the lens LE corresponding to the measurement locus MT (the shape of the lens chuck shaft 102 in the X direction, which is the axis L1 direction) is measured. In this device, the shape of the front refracting surface of the lens LE is measured by using the movement control of the lens chuck shaft 102 in the X direction during the measurement, and the lens shape information is acquired in the X direction of the lens chuck shaft 102. Movement information is also used. Since the shape measurement of the rear refracting surface of the lens LE is also performed in the same manner, the description thereof will be omitted.

By executing the lens shape measurement, the control unit 50 obtains the shape information of the refracting surface of the lens LE. For example, let the measurement result of the refracting surface in front of the lens be (mr, mθ, mz). Mr is the radius length of the measurement locus MT, mθ is the radius angle, and mz is the position data of the lens refracting surface in the axis L1 direction of the lens chuck shaft 102 (distance data with respect to a predetermined reference position).

Once the measurement result of the refraction surface shape of the lens LE is obtained, the control unit 50 determines the edge position of the lens chuck shaft 102 in the axis L1 direction and the edge position thereof with respect to the edge radial trajectory KA scheduled after the finishing process of the lens LE. The inclination information of the lens refracting surface in the above is calculated (acquired). The edge radial trajectory KA in this embodiment is two-dimensional radial radius information (radial length and radial angle information) in which the edge after finishing is located. For example, the conventional first measurement trajectory. It is CT1. By obtaining the edge positions on the front refracting surface and the rear refracting surface of the lens LE corresponding to the edge radial trajectory KA, the edge thickness of the lens LE after the finishing process can be 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 grooving processing, the groove center position in the thickness direction of the lens LE can be determined. can. 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.

A method of obtaining the edge position in the axis L1 direction with respect to the edge radial trajectory KA and the inclination information of the lens refracting surface at the edge position will be described. For example, the control unit 50 mathematically obtains a sphere Sc (see FIG. 8) on which the measurement locus MT is placed based on the measurement result (mr, mθ, mz) of the refracting surface in front of the lens. For example, an arbitrary 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, any four points are points that pass through the geometric center of the measurement locus MT and are located in orthogonal directions. Then, the calculation for finding the sphere is performed a plurality of times by changing the method of taking arbitrary four points. For example, if the number of measurement points is 1,000, an operation for obtaining 250 spheres is performed. Then, using the least squares method or the like, the radius and center of the closest sphere Sc on which the measurement locus MT is placed are obtained. The center of the sphere Sc is determined to be located on the lens chuck shaft 102.

If the sphere Sc can be obtained, the edge radial trajectory 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. Let Kp be the locus projected on the sphere Sc (edge projection locus). Thereby, the edge position in the axis L1 direction corresponding to the locus Kp can be mathematically obtained. Further, since the radius of the sphere Sc is known, the inclination information at each edge position corresponding to the locus Kp (that is, the inclination information of the lens refracting surface with respect to the lens chuck axis 102) can be obtained. This tilt information is used, for example, to determine the width of the chamfering of the edge of the lens LE.

With respect to the posterior refracting surface of the lens LE, the control unit 50 acquires the edge position in the axis L1 direction with respect to the edge radial trajectory KA and the inclination information of the lens refracting surface at the edge position.

As described above, with respect to one side of the refracting surface of the lens LE, information necessary for processing the lens LE in one round of lens shape measurement (for example, the edge position after finishing processing and the inclination information of the lens surface at the edge position). Is acquired, so that the measurement time can be shortened as compared with the conventional measurement of two or more laps. In addition, it becomes possible to obtain more measurement data than the conventional one-lap measurement in the measurement time of one round, and the accuracy of the information required for processing is improved.

If the radius length (radius length based on the geometric center of the lens) differs greatly depending on the radius angle, as in the case where the lens shape has a long square shape, one of the conventional two-lap measurements is performed. It may be possible to estimate the sphere Sc shown in FIG. 8 only by the measurement (for example, the first measurement locus CT1). However, if the ball shape is close to a sphere, the estimation accuracy of the sphere Sc is lowered, and the accuracy of the edge position information (edge position in the axis L1 direction and inclination information at the edge position) scheduled after finishing is lowered. On the other hand, if the method for determining the measurement locus of the present embodiment is used, the measurement data corresponding to the two-lap measurement can be obtained in the measurement time of the one-lap measurement, and the accuracy of the edge position information can be improved.

When the lens LE has an altitude of astigmatism, the posterior refracting surface has an aspherical shape deviated from the spherical surface. In this case, the accuracy of the edge position and inclination information of the locus Kp obtained based on the above sphere Sc may decrease. In such a case, the lens may be made selectable by the selection unit 52, which is an example of the selection means, so that the measurement of at least two turns of the lens can be performed. For example, the measurement loci of two laps are determined by the control unit 50 as different loci based on the lens shape. For example, as in the conventional measurement loci C1 and CT2 of the two-lap measurement, the first measurement locus of the first lap is determined based on the lens shape, and the second measurement locus of the second lap is relative to the first measurement locus. It is determined as a locus that is changed by a certain distance in the radial direction.

For example, the selection unit 52 is provided with a selection switch for an operator to input a selection signal, and when the selection switch has a signal input, the control unit 50 executes two-lap measurement. Further, the input of the selection signal may be automatically performed by the control unit 50. For example, the astigmatic power of the lens LE is input by the data input unit 13, and the control unit 50 selects whether to perform one-lap measurement or two-lap measurement based on the astigmatic power.

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

When the desired shape information is obtained after the finishing process of the lens LE, the peripheral edge processing of the lens LE is performed. The peripheral processing of the lens LE will be briefly described. In the following, the case of bevel processing will be described. First, roughing is performed. The control unit 50 acquires roughing data based on the lens shape, the moving unit 300 is controlled based on the roughing data, and the lens LE is roughed by the roughing tool 163a. Subsequently, the bevel finish processing is performed. The control unit 50 calculates the bevel locus (radius information and information on the position of the bevel apex in the axis L1 direction) based on the shape information scheduled after finishing the lens LE, and the moving unit 300 is based on this calculation. The peripheral edge of the lens LE after being controlled and rough-processed is beveled by the finishing tool 163d. When there is chamfering, the moving unit 300 is controlled based on the edge position information of the locus Kp and the inclination information at the edge position, and the edge of the lens LE is chamfered by the chamfering tool possessed by the second processing tool unit 400. ..

The measurement locus MT of FIG. 6 described above is merely an example. 9 and 10 are diagrams showing another example of the measurement locus MT. FIG. 9A is an example in which the locus of the variable component Δd changes linearly with respect to the example of FIG. 9 (b) shows that, with respect to the example of FIG. 6, in the measurement locus MT, a part of the locus is along the reference locus ST1 and a part of the locus is along the auxiliary locus ST2, and a straight line or a curve is formed between the two. This is an example in which the locus of the variable component Δd is determined so as to be a locus connected by. Further, FIGS. 9 (a) and 9 (b) are examples in which the locus of the variable component Δd appears periodically. When a plurality of variable components Δd appear, their heights (distance in the radial direction with respect to the reference locus ST1) may differ depending on the location.

Even if it is a circular lens shape (reference locus ST1), in principle, a sphere Sc on which the measurement locus MT is placed can be obtained as long as it has a component in which at least a part of the circular shape fluctuates in the radial direction. , It is not always necessary to make it appear periodically. For example, as shown in FIG. 9C, only one locus of the variable component Δd may appear with respect to the reference locus ST1.

Further, FIG. 9D shows a case where two loci of the fluctuation component Δd appear, and in one fluctuation component Δd, 1/4 of the measurement locus MT has a locus having a fluctuation component along the auxiliary locus ST2. This is an example in which the second variable component Δd is arranged in a 180-degree target.

In FIG. 10, the fluctuation component Δd coincides with the auxiliary locus ST2 at four points of the radial angles of the measurement locus MT, which are 0 degrees, 90 degrees, 180 degrees, and 270 degrees, and the radial angles are 45 degrees, 135 degrees, 225 degrees, and 315. This is an example of a measurement locus MT that matches the reference locus ST1 at four points and connects each point with a curve.

As described above, the measurement locus MT has various patterns, and may have a component Δd that is partially varied in the radial direction with respect to the reference locus ST1. The variable component Δd may be at least one, and preferably a plurality.

Although the typical examples of the present disclosure have been described above, the present disclosure is not limited to the examples shown here, and various modifications can be made within the scope of making the technical idea of the present disclosure the same.

1 Eyeglass lens processing device 50 Control unit 52 Selection unit 100 Lens holding unit 150 1st processing tool unit 102 Lens chuck axis 200 Eyeglass lens shape measuring device 200A Lens shape measuring unit 260 Stylus 280 Sensor 300 Moving unit ST1 Reference trajectory MT measurement trajectory Δd variable component

Claims (8)

A spectacle lens shape measuring device that measures the shape of the refracting surface of a spectacle lens based on a lens shape.
A holding means for holding the spectacle lens and
A stylus that comes into contact with the refracting surface of the spectacle lens,
A moving means that relatively changes the positional relationship between the spectacle lens held by the holding means and the stylus.
A detecting means for detecting the position of the stylus in the holding axis direction of the holding means, and
A measurement locus determining means for determining a reference locus for one circumference of the spectacle lens based on the lens shape and determining a measurement locus so as to have a component partially varied in the radial direction with respect to the reference locus.
A control means that controls the moving means based on the measurement locus and acquires the shape of the refracting surface of the spectacle lens in the holding axis direction of the holding means based on the detection result of the detecting means.
A spectacle lens shape measuring device comprising. The spectacle lens shape measuring device according to claim 1, wherein the measurement locus is a locus having a component periodically changed in the radial direction with respect to the reference locus. In the spectacle lens shape measuring device according to claim 1 or 2, the measurement locus has at least one of a component that is curvedly changed in the radial direction and a component that is linearly changed with respect to the reference locus. A featured spectacle lens shape measuring device. In the spectacle lens shape measuring device according to any one of claims 1 to 3, the measurement locus determining means determines an auxiliary locus in which a constant distance is varied in the radial direction over the entire circumference with respect to the reference locus. A spectacle lens shape measuring device, characterized in that a measurement locus is determined so as to pass through the auxiliary locus. In the spectacle lens shape measuring device of claim 1, the control means obtains a sphere on which the measurement locus is placed based on the detection result of the detection means, and the edge moving diameter locus scheduled after finishing the spectacle lens on the obtained sphere. A spectacle lens shape measuring device, characterized in that the shape of a lens refracting surface with respect to the projected locus is acquired by projecting. In the spectacle lens shape measuring device of claim 1, a two-circumferential trajectory determining means for determining different measurement trajectories of at least two laps of the spectacle lens based on a lens shape,
The control means is a selection means configured to select a measurement locus when controlling the moving means, and the measurement locus is a measurement locus determined by the measurement locus determining means, or the two-lap locus. A selection means for selecting whether to use a measurement trajectory of at least two laps determined by the determination means,
A spectacle lens shape measuring device characterized by comprising. A spectacle lens processing apparatus comprising the spectacle lens shape measuring apparatus according to any one of claims 1 to 6. A moving means that relatively changes the positional relationship between the spectacle lens held by the holding means and the stylus based on the lens shape, and a detecting means that detects the position of the stylus in the holding axis direction of the holding means. A spectacle lens shape measurement program executed by a spectacle lens shape measuring device that measures the shape of the refracting surface of the spectacle lens based on the detection result of the detection means.
A reference trajectory determination step that determines the reference trajectory for one round of the spectacle lens based on the lens shape, and
A measurement locus determination step of determining a measurement locus so as to have a component partially varied in the radial direction with respect to the reference locus, and a measurement locus determination step.
A control step of controlling the moving means based on the measurement locus and obtaining the shape of the refracting surface of the spectacle lens in the holding axis direction of the holding means based on the detection result of the detecting means.
A spectacle lens shape measuring program characterized by causing a spectacle lens shape measuring device to execute.

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