JP2021159998A - Spectacle lens processing device, and formation data setting program for v-groove or groove - Google Patents

Abstract

To form a V-groove or groove capable of making better a correction state of spectacle wearer's eyes.SOLUTION: A spectacle lens machining device which forms a V-groove or groove in a peripheral edge of a spectacle lens comprises: curvature angle acquisition means which acquires a curvature angle of a spectacle frame; lens shape acquisition means which acquires lens shape information including edge face positions of a front refraction surface and a rear refraction surface of a spectacle lens corresponding to a lens shape; layout data acquisition means which acquires layout data on position relation of the optical center of a spectacle lens to the lens shape; and arithmetic means which finds formation data on a V-groove or groove formed in the peripheral edge of the spectacle lens based upon the lens shape and lens shape information, the arithmetic means computing the formation data on the V-groove or groove for aligning an optical axis direction of the spectacle lens with a view axis direction of a wearer's eye in a spectacle wearing state.SELECTED DRAWING: Figure 6

Description

The present disclosure sets a spectacle lens processing device for forming a bevel or groove on the spectacle lens for holding (fitting) the spectacle lens on the spectacle frame (rim), and setting data for forming the bevel or groove on the spectacle lens. Related to bevel or groove formation data setting programs.

As a method of setting a bevel or a groove formed on the peripheral edge of the spectacle lens, a method of dividing the edge thickness of the lens at a predetermined ratio and a method of following the frame curve of the spectacle frame are generally known. In addition, in order to improve the appearance of the edge with respect to the frame when the lens is framed in the spectacle frame, the bevel position from the front surface of the lens is set to be about the same at the edge positions in the vertical and horizontal directions of the lens. A method (see, for example, Patent Document 1) and a method of setting the bevel so as to prevent the width of the bevel slope on the rear surface of the lens from appearing large (see, for example, Patent Document 2) have been proposed.

Japanese Unexamined Patent Publication No. 2009-160682 JP-A-2009-241240

However, the conventional method of setting the bevel or groove is mainly performed with an emphasis on improving the appearance of the edge with respect to the frame when the lens is framed in the spectacle frame, and the visual axis of the spectacle wearer's eye. The positional relationship between the direction and the optical axis direction of the spectacle lens was not considered. For example, if the relationship between the visual axis direction of the spectacle wearer's eye and the optical axis direction of the spectacle lens is separated from the parallelism, the spectacle lens cannot properly correct the spectacle wearer's eye.

In view of the above-mentioned prior art, it is an object of the present disclosure to provide a spectacle lens processing device capable of forming a bevel or a groove capable of improving the correction state of the eye of a spectacle wearer, and a program for setting data for forming a bevel or a groove. ..

In order to solve the above problems, the present invention is characterized by having the following configurations.
(1) The spectacle lens processing device according to the first aspect of the present disclosure is a spectacle lens processing device for forming a bevel or a groove for holding a spectacle lens on the rim of the spectacle frame on the peripheral edge of the spectacle lens. The warp angle acquisition means for acquiring the warp angle of the lens shape, the lens shape acquisition means for acquiring the lens shape information including the edge positions of the anterior and posterior refracting surfaces of the spectacle lens corresponding to the lens shape, and the spectacle lens for the lens shape. It is a layout data acquisition means for acquiring layout data of the positional relationship of the optical center, and a calculation means for obtaining bevel or groove formation data to be formed on the peripheral edge of the spectacle lens based on the lens shape and the lens shape information. Based on the layout data and the warp angle, a calculation means for calculating bevel or groove formation data that makes the optical axis direction of the spectacle lens the same as the visual axis direction of the wearer's eye when wearing the spectacle lens is provided. It is a feature.
(2) The bevel or groove formation data setting program according to the second aspect of the present disclosure includes a warp angle acquisition means for acquiring the warp angle of the spectacle frame, and an anterior refracting surface and a posterior refracting surface of the spectacle lens corresponding to the lens shape. It is provided with a lens shape acquisition means for acquiring lens shape information including the edge position of the spectacle frame and a layout data acquisition means for acquiring layout data of the positional relationship of the optical center of the spectacle lens with respect to the spectacle shape, and the spectacle lens is attached to the rim of the spectacle frame. This is a bean or groove formation data setting program executed by a spectacle lens processing device that forms a bevel or groove on the peripheral edge of the spectacle lens to hold the spectacle lens. It is a calculation step for obtaining data on the formation of bevels or grooves formed on the peripheral edge, and further, based on the layout data and the warp angle, the optical axis direction of the spectacle lens is the same as the visual axis direction of the wearer's eye when wearing spectacles. It is characterized in that a calculation step for calculating the formation data of the bevel or the groove to be formed is executed by the calculation unit of the spectacle lens processing apparatus.

It is a figure explaining the structure of the processing mechanism part in the spectacle lens processing apparatus. It is a schematic block diagram of a lens shape measurement unit. It is a control system block diagram about a spectacle lens processing apparatus. It is a figure explaining the warp angle of a spectacle frame. This is an example of a display screen when setting processing conditions. It is a figure explaining the method of obtaining the formation data of bevel. It is a figure which shows the example of the state in which the lens which has been beveled by the tentative bevel locus is held by the rim. It is a figure which shows the example of the state in which the lens which has been beveled by the bevel locus considering the warp angle is held by the rim. It is explanatory drawing for arranging the bevel position in the vertical direction of a lens. It is a figure explaining the case where the amount of protrusion of the refracting surface in front of a lens with respect to the front end of a rim is large. It is a figure explaining the forward tilt angle of the spectacle frame.

Hereinafter, this embodiment will be described with reference to the drawings. FIGS. 1 to 11 are views for explaining the configuration of the spectacle lens processing apparatus and the bevel or groove formation data setting program according to the present embodiment.

[Overview]
For example, the spectacle lens processing apparatus includes a holding means (for example, a lens holding unit 100) configured to hold a 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 processing apparatus includes a lens rotating means (for example, a motor 120) for rotating the lens LE. For example, the spectacle lens processing device includes a processing tool for processing the peripheral edge of the lens LE (for example, a processing tool 168, a groove drilling tool 462). For example, the processing tool includes a bevel processing tool (for example, a finishing processing tool 164) for forming a bevel on the peripheral edge of the lens LE. For example, the processing tool includes a groove processing tool (for example, a groove processing tool 462) for forming a groove on the peripheral edge of the lens LE. For example, the spectacle lens processing apparatus 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 processing tool. For example, the spectacle lens processing device includes a control means (for example, a control unit 50) that controls the drive of the moving means.

For example, the spectacle lens processing apparatus includes a warp angle acquisition means (for example, a data acquisition unit 10) for acquiring the warp angle of the spectacle frame. For example, the spectacle lens processing apparatus 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). The term "ball shape" is self-evident in the field of processing spectacle lenses. For example, the spectacle lens processing apparatus includes layout data acquisition means (for example, a data acquisition unit 10) that acquires layout data of the positional relationship of the optical center of the lens LE with respect to the lens shape.

For example, the spectacle lens processing apparatus includes a lens shape acquisition means (for example, a control unit 50) that acquires lens shape information on the refracting surface of the lens LE. For example, the lens shape acquiring means includes a lens shape measuring means (for example, a lens shape measuring unit 200) configured to acquire the positions of the anterior refracting surface and the posterior refracting surface of the lens LE corresponding to the lens shape. For example, the lens shape measuring means includes a stylus (for example, stylus 206F, 206R) that comes into contact with the anterior refracting surface and the posterior refracting surface of the lens LE. For example, the lens shape measuring means includes detecting means (for example, detectors 213F and 213R) for detecting the position of the stylus in the axial direction of the holding shaft of the holding means (for example, the X-axis direction in FIG. 1). For example, the lens shape acquisition means may include curve information acquisition means (for example, control unit 50, data acquisition unit 10) for acquiring curve information of the front refraction surface of the lens LE.

For example, the spectacle lens processing apparatus includes a calculation means (for example, a control unit 50) for obtaining data on formation of a bevel or a groove formed on the peripheral edge of the lens LE based on the lens shape and the lens shape information. For example, the calculation means further obtains bevel or groove formation data based on the layout data and the warp angle acquired by the warp angle acquisition means. For example, the calculation means obtains bevel or groove formation data that makes the optical axis direction of the lens LE the same as the visual axis direction of the wearer (wearer's eye) when wearing spectacles. For example, the calculation means obtains bevel or groove formation data that makes the optical axis direction of the lens LE in the left-right direction the same as the visual axis direction of the wearer's eye when wearing spectacles by considering the warp angle. Thereby, the correction state of the wearer's eye by the lens LE can be improved.

The optical axis direction of the lens LE and the visual axis direction of the eye may be substantially the same so that the correction state of the eye by the lens LE can be achieved as a target. In other words, they may be substantially the same. For example, the prescription of the refractive power of the lens LE is a constant power unit (for example, generally 0.25 day opter unit), so if the correction state in this power unit is ensured, the lens The positional relationship between the optical axis direction of LE and the visual axis direction of the eye may be slightly changed.

For example, the calculation means obtains the optical axis direction of the lens LE at the time of forming a bevel or a groove based on the positional relationship between the spherical geometric center of the layout data and the optical center of the spectacle lens and the curve information of the lens LE. .. Next, the calculation means is based on the obtained optical axis direction and the warp angle, and the positional relationship between the position of the bevel or groove on the nasal side and the position of the bevel or groove on the ear side in the edge direction of the lens LE corresponding to the lens shape. By obtaining, the formation data of the bevel or the groove that makes the optical axis direction of the lens LE in the left-right direction the same as the visual axis direction of the wearer's eye when wearing spectacles is calculated.

For example, the spectacle lens processing apparatus includes a bevel or groove curve acquisition means (for example, a control unit 50) for acquiring curve information of a bevel or groove formed on the peripheral edge of the lens LE. For example, the calculation means calculates the formation data of the bevel or groove so that the curve of the bevel or groove passes through the position of the bevel or groove on the nasal side and the position of the bevel or groove on the ear side.

Further, for example, the calculation means obtains temporary bevel or groove formation data based on the edge position of the spectacle lens corresponding to the lens shape, and determines the position of the bevel or groove on the nasal side and the position of the bevel or groove on the ear side. The formation data of the bevel or groove is obtained by inclining the formation data of the temporary bevel or groove so as to approach the other with reference to one. For example, the calculation means tilts the temporary bevel or groove formation data with reference to the position of the bevel or groove on the nasal side, and obtains the bevel or groove formation data so as to pass through the position of the bevel or groove on the ear side. ..

Further, the spectacle lens processing apparatus may include at least a rim data acquisition means (for example, a data acquisition unit 10) for acquiring data on the front end side of the rim with respect to the groove position of the rim. For example, the arithmetic means forms a bevel or a groove so that when the rim holds (fits) the spectacle lens, the positional relationship between the front end of the rim and the front refracting surface of the lens LE approaches a predetermined reference. The data may be corrected. For example, on the nasal side and the ear side, the bevel or groove formation data is offset so that the amount of protrusion or bite of the front surface of the lens with respect to the front end of the rim is within a certain distance. As a result, the appearance (the positional relationship between the rim and the edge of the lens LE) when the lens LE is attached to the rim can be improved.

For example, the spectacle lens processing apparatus may include a anteversion angle acquisition means (for example, a data acquisition unit 10) for acquiring a spectacle frame anteversion angle. For example, the calculation means obtains bevel or groove formation data that makes the optical axis direction of the lens LE in the vertical direction of the lens shape the same as the visual axis direction of the eyeglass wearer's eye based on the layout data and the forward tilt angle. For example, the calculation means obtains the optical axis direction of the lens LE at the time of forming a bevel or a groove based on the positional relationship between the spherical geometric center of the layout data and the optical center of the spectacle lens and the curve information of the lens LE. Based on the obtained optical axis direction and forward tilt angle, the vertical relationship between the position of the upper bevel or groove and the position of the lower bevel or groove in the edge direction of the lens LE corresponding to the lens shape is obtained. Calculate the formation data of the bevel or groove that makes the optical axis direction of the lens LE in the direction the same as the visual axis direction of the wearer's eye when wearing spectacles. As a result, the correction state of the wearer's eye by the lens LE can be improved even in the vertical direction.

For example, a bevel or groove formation data setting program executed by the calculation unit of the spectacle lens processing apparatus is a calculation step for obtaining bevel or groove formation data to be formed on the peripheral edge of the lens LE based on the lens shape and the lens shape information. Further, based on the layout data and the warp angle, a calculation step for calculating bevel or groove formation data that makes the optical axis direction of the lens LE the same as the visual axis direction of the wearer's eye when wearing spectacles. Let the arithmetic unit of the spectacle lens processing device execute the data.

[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, the spectacle lens processing device 1 includes a lens holding unit 100 which is an example of a holding means for holding a lens LE. For example, the spectacle lens processing device 1 includes a lens shape measuring unit 200 configured to acquire lens shape information of the refracting surface of the lens LE. For example, the spectacle lens processing device 1 includes a processing tool unit 150 configured to rotate a processing tool 168 for processing the peripheral edge of the lens LE. For example, the spectacle lens processing device 1 includes a moving unit 300 which is an example of moving means. The moving unit 300 is configured to change (adjust) the relative positional relationship between the lens LE and the processing tool 168 of the processing tool unit 150. Further, the moving unit 300 is used to change the relative positional relationship between the stylus 200 included in the lens shape measuring unit 200 and the lens LE.

For example, the lens holding unit 100 includes a lens chuck shaft 102 which is an example of a holding shaft. Further, the lens holding unit 100 includes a carriage 101. The lens chuck shaft 102 is configured to hold (hold) and rotate the lens LE. The lens chuck shaft 102 includes a pair of lens chuck shafts 102L and 102R. The lens chuck shaft 102L is rotatably held by the left arm 101L of the carriage 101, and the lens chuck shaft 102R is rotatably held by the right arm 101R of the carriage 101. The lens chuck shaft 102 (lens LE) is rotated by a motor 120, which is an example of a lens rotating means.

For example, the machining tool unit 150 includes a motor 160 which is an example of a machining tool rotating means for rotating the machining tool rotating shaft 161. The processing tool rotation shaft 161 is rotatably held by the main body base 170 in a positional relationship parallel to the lens chuck shaft 102. A processing tool 168 for processing the peripheral edge of the lens LE is attached to the processing tool rotation shaft 161. For example, the processing tool 168 includes a finishing processing tool 164 which is an example of a bevel processing tool. The finishing tool 164 is provided with a V-groove for bevel processing for forming a bevel on the peripheral edge of the lens LE. The finishing tool 164 may include a flat-finished surface for flat-finishing. Further, the processing tool 168 may include a rough processing tool 166. Further, the processing tool 168 may include a mirror finishing processing tool 165. Further, the processing tool 168 may include a front bevel processing tool 162 and a rear bevel processing tool 163 for a high curve lens. For example, the processing tool 168 uses a grindstone, but may be a cutter.

The moving unit 300 is configured to change (adjust) the relative position of the lens LE held on the lens chuck shaft 102 and the processing tool 168. For example, the moving unit 300 includes a first moving unit 310 that fluctuates the distance between the lens chuck shaft 102 and the processing tool rotating shaft 161 and a second moving unit 330 that moves the lens LE in the axial direction of the lens chuck shaft 102. And. In the embodiment, the axial direction of the lens chuck shaft 102 is the X direction. The direction in which the distance between the lens chuck shaft 102 and the processing tool rotation shaft 161 is changed is defined as the Y direction.

The first moving unit 310 includes a motor 315. The rotation of the motor 315 causes the moving support 301 to move in the X direction. As a result, the carriage 101 and the lens chuck shaft 102 (lens LE) mounted on the moving support base 301 are moved in the X direction. The configuration of the first moving unit 310 may be such that the machining tool rotation shaft 161 is 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. The carriage 101 is held by the moving support 301 so as to be movable in the Y direction along the shafts 333 and 334. 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 processing tool rotating shaft 161 may be moved in the Y direction. That is, the second moving unit 330 may have a configuration in which the distance between the lens chuck shaft 102 and the processing tool rotating shaft 161 is relatively changed.

Further, for example, the spectacle lens processing device 1 may include a chamfering / grooving processing unit 450. At least one of the chamfering tool 462 and the grooving tool 462 is provided on the machining tool rotation shaft of the chamfering / grooving machining unit 450. For example, the chamfering tool 462 includes a front chamfering tool for chamfering the edge of the front refracting surface of the lens LE and a back chamfering tool for chamfering the edge of the rear refracting surface of the lens LE. The grooving tool 462 is used to form a groove on the peripheral edge of the flat-finished lens LE. For example, the machining tool rotation shaft of the chamfering / grooving machining unit 450 is placed in the retracted position, and is moved from the retracted position to a predetermined machining position during machining. The moving unit 300 is configured to change (adjust) the relative positions of the lens LE held by the lens chuck shaft 102 and at least one of the chamfering tool 462 and the groove drilling tool 462. The moving unit 300 may include means for moving the machining tool rotation axis of the trenching machining unit 450 from the retracted position to the machining position.

In FIG. 1, the lens shape measuring unit 200 is arranged above the carriage 101. The lens shape measuring unit 200 is used to acquire the shape of the front refracting surface (front surface of the lens) and the shape of the rear refracting surface (rear surface of the lens) of the lens LE. For example, the lens shape measuring unit 200 includes a measuring unit 200F for measuring the shape of the front refracting surface of the lens LE and a measuring unit 200R for measuring the shape of the rear refracting surface of the lens LE.

FIG. 2 is a schematic configuration diagram of the measurement unit 200F. The measuring unit 200F has a stylus 206F that contacts the front refracting surface of the lens LE. The measuring unit 200F includes a detector 213F which is an example of a detecting means for detecting the position of the stylus 206F in the axial direction (X direction) of the lens chuck shafts 102 (102L, 102R). The stylus 206F is attached to the tip of the arm 204F. The arm 204F is held by the mounting support 201F so as to be movable in the X direction. The arm 204F is connected to the motor 216F via a rack 211F, a pinion 212F, a gear 214F, and the like. The arm 204F is moved in the X direction by the drive of the motor 216F, and the stylus 206F is pressed against the front refracting surface of the lens LE. The pinion 212F is attached to the rotating shaft of the detector 213F (for example, an encoder). The position of the stylus 206F moved in the X direction is detected by the detector 213F.

For example, since the configuration of the measurement unit 200R for measuring the shape of the rear refracting surface of the lens LE is symmetrical with the measurement unit 200F, the description thereof will be omitted. The measuring unit 200R includes a stylus 206R that comes into contact with the rear refracting surface, a motor 216R that moves the stylus 206R in the X direction, and a detector 213R that detects the position of the stylus 206R in the X direction.

When measuring the lens shape, the stylus 206F is in contact with the anterior refracting surface of the lens LE, and the stylus 206R is in contact with the posterior refracting surface of the lens LE. In this state, the lens LE is rotated by the lens holding unit 100, and the lens chuck shafts 102L and 102R are moved in the Y direction by the moving unit 300 based on the lens shape data. The shapes of the anterior refracting surface and the posterior refracting surface are measured at the same time. That is, the measurement unit 200F measures the edge position of the front refraction surface of the lens LE corresponding to the lens shape, and the measurement unit 200R measures the edge position of the rear refraction surface of the lens LE corresponding to the lens shape.

FIG. 3 is a control system block diagram relating to the spectacle lens processing device 1. 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 is configured to control the entire device. Further, the control unit 50 is configured as an example of a calculation means for obtaining the formation data of the bevel formed on the peripheral edge of the lens LE. Further, the control unit 50 is configured as an example of a calculation means for performing various calculations for lens processing.

For example, the spectacle lens processing device 1 includes 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.

The data acquisition unit 10 may be connected to the spectacle frame shape measuring device 30. For example, the spectacle frame shape measuring device 30 is configured to measure the shape of the rim or the demo lens (lens removed from the eye frame) of the spectacle frame. For example, the spectacle frame shape measuring device 30 inserts a stylus into a groove of the rim and detects the position of the stylus that is relatively moved along the rim to detect the shape of the rim (three-dimensional shape of the groove of the rim). ) Can be used (see, for example, Japanese Patent Application Laid-Open No. 2014-21069). Further, the spectacle frame shape measuring device 30 may be configured to measure the outer diameter shape of the demo lens removed from the half rim. In this case, the lens shape of the demo lens is obtained. Further, for example, the spectacle frame shape measuring device 30 irradiates the measurement light from the light source toward the groove of the rim, receives the reflected light of the measurement light reflected by the groove of the rim by the detector, and receives the light by the detector. A structure that acquires the cross-sectional shape of the groove of the rim (cross-sectional shape in the thickness direction of the rim) based on the reflected light may be used (see, for example, International Publication No. 2019-026416). In the spectacle frame shape measuring device 30, the three-dimensional shape of the groove (bottom) of the rim can be obtained by obtaining the cross-sectional shape of the entire circumference of the rim.

For example, in the spectacle frame shape measuring device 30, a lens shape (two-dimensional outer diameter shape of the target lens) can be obtained based on the measurement result of the rim or the demo lens. Further, in the spectacle frame shape measuring device 30, by holding the left and right rims of the spectacle frame with the frame holding means for measurement, information on the warp angle of the spectacle frame can be obtained from the measurement result. The shape of the rim or demo lens obtained by the spectacle frame shape measuring device 30 and the warp angle of the spectacle frame are input to the data acquisition unit 10 and acquired by the data acquisition unit 10.

For example, the spectacle lens processing device 1 includes 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, various programs for controlling the operation of the spectacle lens processing device 1 are stored in the memory 20. For example, the memory 20 stores a program related to peripheral processing of the lens LE. Further, the memory 20 stores a bevel or groove formation data setting program for setting bevel or groove formation data when forming the bevel or groove on the spectacle lens. The data acquisition unit 10 and the memory 20 are connected to the control unit 50.

The operation of the spectacle lens processing apparatus 1 having the above configuration will be described.
First, the data acquisition unit 10 acquires data of a lens shape (radial length r, radial angle θ) for processing the lens LE. For example, the shape of the rim or the demo lens of the spectacle frame is measured by the spectacle frame shape measuring device 30, and the lens shape data 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 advance in the memory 20.

Further, as shown in FIG. 4, the warp angle α of the spectacle frame (rim) is obtained based on the three-dimensional shape of the rim measured by the spectacle frame shape measuring device 30, and the warp angle α is input to the data acquisition unit 10. Will be done. FIG. 4 is a diagram illustrating a warp angle of the spectacle frame. For example, in the three-dimensional shape of the right rim FR, the nasal end (the most nasal point) in the left-right direction Xs on FIG. 4 is FR1, and the ear-side end (the most ear-side point) in the left-right direction Xs is FR2. do. The warp angle α is obtained as an angle formed by a straight line connecting the nasal end FR1 and the ear end FR2 and the left-right direction Xs. When the three-dimensional shapes of the left and right rims are obtained, the warp angle α may be obtained as the average value of the warp angle of the right rim and the warp angle of the left rim.

Further, the warp angle α of the spectacle frame is not obtained from the three-dimensional shape of the rim, but may be obtained visually by the operator, for example, by placing the spectacle frame on a simple warp angle measurement chart or a screen for angle measurement. In this case, for example, the operator may input the value of the warp angle α using the data input unit 13. As a result, the warp angle α is acquired by the data acquisition unit 10.

When the necessary data such as 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. FIG. 5 is a screen example of the display 12 when processing conditions are set. In FIG. 5, the screen 600 of the display 12 displays a ball-shaped TGR for the right eye and a ball-shaped TGL for the left eye. For peripheral processing of the lens LE, layout data of the positional relationship of the optical center of the lens LE with respect to the lens shape is input. For example, the layout data includes the left and right interpupillary distance FPD (distance between the geometric center TCR of the right eye lens TGR and the geometric center TCL of the left eye lens TGL) and the interpupillary distance PD (glasses). The distance between the optical center OCR of the wearer's right eye lens and the optical center OCL of the left eye lens). Further, the layout data includes the height distance of the optical center with respect to the left and right lens-shaped centers. These values can be input by the numeric keypad displayed by touching the display field on the screen 600.

In addition, as processing conditions, the material of the lens LE (plastic, polycarbonate, etc.), the type of eyeglass frame (metal, cell, rimless, etc.), the processing type of the lens LE (bevel processing, flat processing, groove processing, etc.), mirror surface The presence / absence of processing and the presence / absence of chamfering can be input in the input fields 611, 612, 613, 614 and 615. Further, according to the input field 616, the frame center chuck (holding the lens LE at the geometric center of the lens) and the optical center chuck (the lens LE at the optical center position of the lens LE) are the positions for holding the lens LE on the lens chuck shaft 102. Hold), and you can choose. Hereinafter, the frame center chuck will be described as an example. Further, in the following, the case of performing bevel processing will be described as an example. Further, in the following, a case where the lens LE is a minus lens will be described as an example.

When the input of the processing conditions is completed and the processing preparation of the lens LE is completed, the operator holds the lens LE on the lens chuck shaft 102 and starts the processing operation of the spectacle lens processing device 1. For example, prior to processing the lens LE, the lens shape measuring unit 200 is driven by the control unit 50, and the refracting surface shape including the edge positions of the front refracting surface and the rear refracting surface of the lens LE corresponding to the lens shape is measured. For example, in the case of bevel processing, the shapes (positions in the X-axis direction) of the anterior refracting surface and the posterior refracting surface of the lens LE are measured at the first measurement locus along the lens shape. Further, the shapes of the anterior refracting surface and the posterior refracting surface of the lens LE are measured in the second measurement locus corresponding to the edge position of the base of the bevel. The shape information of the refracting surface of the lens LE is acquired by the control unit 50. Further, by measuring the shapes of the anterior refracting surface and the posterior refracting surface, the edge thickness (lens thickness) for each radius angle of the lens LE is acquired by the control unit 50. Further, the control unit 50 calculates the lens curve of the front refraction surface by obtaining different position information in the radial direction of the front refraction surface (front surface of the lens) from the first measurement locus and the second measurement locus.

When the shape information of the refracting surface of the lens LE is obtained, the control unit 50 calculates the bevel locus data (Vr, Vθ, Vz) which is an example of the bevel formation data formed on the peripheral edge of the lens LE. For example, Vr of the bevel locus data is the radius length data of the bevel apex, Vθ is the radius angle data, and Vz is the distance data of the bevel apex with respect to the reference position in the axial direction (X direction) of the lens chuck axis 102. be. First, an example of using tentative bevel formation data will be described.

FIG. 6 is a diagram for explaining a method of obtaining bean formation data, and the lens LE for the right eye is taken as an example. In FIG. 6, LX indicates the central axis of the lens chuck shaft 102, and LO indicates the optical axis of the lens LE. For example, as shown in FIG. 6A, in the lens LE held by the lens chuck shaft 102, the edge thickness of the entire circumference of the lens LE is divided by a predetermined ratio (for example, a ratio of 4: 6). By arranging the apex position Lvt of Lv, the temporary bevel locus YC1 is calculated by the control unit 50. The setting of the provisional bevel locus YC1 is not limited to this example, and a well-known one can be used.

The position of the optical axis LO on the front refraction surface Lf of the lens LE held by the lens chuck axis 102 is the layout data (the distance between the center of the lens FPD, the distance PD between the pupils, and the height distance of the optical center with respect to the center of the lens). Is required based on. Further, the direction of the optical axis LO with respect to the central axis LX is obtained based on the curve information of the front refraction surface Lf. For example, the control unit 50 obtains a sphere on which the curve of the front refraction surface Lf is placed, and calculates the optical axis LO so as to pass through the center of the obtained sphere.

Here, when the lens LE is actually beveled on the temporary bevel locus YC1 and the processed lens LE is held by the right rim FR of the spectacle frame of FIG. 4, for example, as shown in FIG. The visual axis SO (visual axis when viewed from a distance) of the wearer's eye in the left-right direction and the optical axis LO of the lens LE may not be in the same direction, and the optical axis LO may be tilted. In this case, the lens LE cannot properly correct the eyes of the spectacle wearer. This is because the warp angle α of the spectacle frame is not taken into consideration in the calculation of the bevel locus YC1. FIG. 7 is a diagram showing an example of a state in which the lens LE processed by the beveled locus YC1 is held by the rim RF.

Therefore, in this embodiment, the control unit 50 determines the bevel position on the nasal side and the bevel position on the ear side in the edge direction of the lens LE corresponding to the lens shape based on the optical axis LO direction and the warp angle α of the lens LE. By obtaining the positional relationship, the bevel formation data (bevel locus) that makes the optical axis direction of the lens LE in the left-right direction the same as the visual axis direction of the eye of the spectacle wearer is calculated. For example, the bevel position on the nose side and the bevel position on the ear side are determined as positions in the left-right direction with respect to the geometric center of the lens shape.

For example, as shown in FIG. 6B, the control unit 50 obtains a direction LH orthogonal to the optical axis LO with reference to the nasal side bevel position YPn1 in the provisional bevel locus YC1. Next, the direction Lα tilted by the warp angle α with respect to the direction LH is obtained with reference to the bevel position YPn1. Subsequently, the bevel position YPe2 on the ear side where the direction Lα and the edge intersect is obtained. Then, a new bevel locus YC2 is obtained by inclining the temporary bevel locus YC1 so as to approach the other with reference to one of the bevel position YPn1 on the nasal side and the bevel position YPe2 on the ear side. For example, a new bevel locus YC2 is obtained by inclining the provisional bevel locus YC1 with reference to the nasal bevel position YPn1 so that the bevel position comes to the bevel position YPe2. As shown in FIG. 6C, the inclination amount ΔT of the bevel locus at this time is the bevel position YPe1 on the ear side in the temporary bevel locus YC1 and the bevel position YPe2 on the ear side in the new bevel locus YC2. Obtained by the difference.

FIG. 8 is a diagram showing a state in which the lens LE, which has been beveled by the bevel locus YC2 in consideration of the warp angle α, is framed (held) in the rim FR. Since the bevel position on the ear side is in the direction considering the warp angle α, the optical axis LO of the lens LE in the left-right direction is the same as the visual axis SO of the wearer's eye. Therefore, the lens LE allows the wearer's eye to be corrected more appropriately.

In the above description, the bevel locus YC2 obtained in consideration of the warp angle α is obtained by inclining the provisional bevel locus YC1 obtained at the beginning, but the present invention is not limited to this. For example, the positional relationship between the bevel position YPn1 on the nasal side and the bevel position YPe2 on the ear side in the edge direction of the lens LE may be obtained based on the optical axis LO direction of the lens LE and the warp angle α. For example, in FIG. 6B, the control unit 50 determines the position at which the edge thickness is divided by a predetermined ratio at the position in the left-right direction passing through the geometric center of the lens shape at the nasal side bevel position YPn1. With reference to the position YPn1, the direction Lα tilted by the warp angle α with respect to the direction LH orthogonal to the optical axis LO is obtained, and this direction Lα intersects the edge position on the ear side (edge position corresponding to the lens shape). The position is determined as the bevel position YPe2 on the ear side.

Further, the control unit 50 acquires a bevel curve arranged on the entire circumference of the edge of the lens LE in advance, and sets the bevel locus YC2 so that the bevel curve passes through the bevel position YPn1 on the nasal side and the bevel position YP2e on the ear side. You may. For example, the bevel curve is the same as the frame curve. For example, the frame curve is obtained from the three-dimensional shape of the rim measured by the spectacle frame shape measuring device 30, and is acquired by the data acquisition unit 10. Alternatively, the bevel curve may be acquired by the control unit 50 as the same curve as the curve of the front refraction surface of the lens LE. The curve of the front refraction surface of the lens LE is obtained from the measurement result by the lens shape measuring unit 200.

In setting the bevel locus YC2 based on the bevel curve, at least one point is sufficient in addition to the bevel positions YPn1 and YPe2. FIG. 9 is an explanatory view for arranging the bevel position in the vertical direction of the lens LE, and is a cross-sectional view in the vertical direction with reference to the geometric center of the lens shape. For example, as shown in FIG. 9, in the control unit 50, at the upper edge position in the vertical direction passing through the geometric center of the lens shape, the position where the edge thickness is divided by a predetermined ratio (for example, 4: 6) is on the upper side. It is determined as the bevel position LPu1. Alternatively, the bevel position LPu1 may be set to a predetermined distance (for example, a distance determined in consideration of the width of the bevel and the width of the rim) from the refracting surface in front of the lens. Then, by arranging the bevel curve so as to pass through the bevel positions YPn1, YPe2 and LPu1, the bevel locus YC2 is calculated.

Further, when setting the bevel locus YC2, instead of arranging the bevel curve set in advance, the bevel curve is determined by determining the bevel positions of two points other than the bevel positions YPn1 and YPe2 and finding the sphere on which the four points are placed. You may decide. For example, the other two points are the upper end and the lower end in the vertical direction passing through the geometric center of the lens shape, and the position in the edge thickness direction is a predetermined distance from the refracting surface in front of the lens (for example, considering the width of the bevel and the width of the rim). Determined as the position of the distance). Then, the bevel curve can be set by finding the sphere on which these four points are placed. When the difference between the bevel curve and the frame curve becomes large, the bevel positions at the upper end and the lower end may be adjusted so as to be closer to the frame curve. There are various methods for determining the two points other than the bevel positions YPn1 and YPe2.

Even with the bevel locus YC2 obtained as described above, as shown in FIG. 8, the optical axis LO of the lens LE is set in the same direction (substantially the same direction) as the visual axis SO of the wearer's eye. As a result, the lens LE allows the wearer's eye to be corrected more appropriately.

The bevel locus YC2 obtained as described above may be moved back and forth (offset) as necessary. For example, when the amount of protrusion or bite of the front refracting surface of the lens with respect to the front end of the rim FR is large, the bevel locus YC is moved back and forth.

For example, as shown in FIG. 10, if the distance RfD from the bevel groove position (groove bottom) VGt of the rim FR to the front end FRf is acquired by the data acquisition unit 10, the lens LE is held by the rim FR. Occasionally, the amount of protrusion (or amount of bite) EXf of the front refracting surface LEf of the lens LE is obtained from the front end FRf of the rim FR. Then, the bevel locus YC2 is moved back and forth so that the amount of squeeze out (or the amount of bite) EXf approaches a predetermined reference (enters or approaches the reference as much as possible), and the bevel locus YC3 (illustrated) is corrected. Is abbreviated). For example, the predetermined standard of the front side protrusion amount (or bite amount) EXf is a value set so that the positional relationship between the front end FRf of the rim FR and the lens front refraction surface LEf looks good. ..

On the contrary, when the rear refracting surface LEr of the lens LE is located too far behind the rear end FRr of the rim FR and the rear refracting surface LEr protrudes too much from the rear end FRr of the rim FR. , To obtain the corrected bevel locus YC3 (not shown) by moving the bevel locus YC2 to the rear side so that the post-refractive surface LEr approaches a predetermined reference (enters the reference or is as close to the reference as possible). It may be. The width RD of the rim FR or the distance Rrd to the rear end FRr with respect to the bevel groove position VGt of the rim FR is acquired by the data acquisition unit 10. Since the position of the rear refraction surface LEr is obtained from the measurement result of the lens shape measuring unit 200, the amount of protrusion EXr of the rear refraction surface LEr of the lens LE can be obtained from the rear end FRr.

Further, if the bevel curve of the bevel locus YC2 is different from the frame curve of the spectacle frame (rim) and the bevel peak formed on the lens LE is partially missing, the bevel locus YC2 is corrected so as to move to the rear side. It may be that. Since the width of the bevel is known by design, the degree to which the bevel peak is chipped is determined by the positional relationship of the bevel locus YC2 with respect to the front refraction surface LEf of the lens LE.

In addition, the bevel position on the nose side and the bevel position on the ear side are within the range in which the correction of the wearer's eye by the lens power is ensured in consideration of the state of formation of the bevel on the edge or the appearance when the lens LE is held on the rim ( If they are substantially the same), they may be moved back and forth slightly.

As described above, when the bevel locus YC2 (or the corrected bevel locus YC3) in consideration of the warpage angle α can be calculated, the process proceeds to the processing stage of the lens LE. First, the drive of the moving unit 300 is controlled by the control unit 50 based on the roughing data, and the peripheral edge of the lens LE held by the lens chuck shaft 102 is roughed by the roughing tool 166. For example, the rough processing data is obtained as data that is enlarged by a predetermined finishing allowance with respect to the lens shape. Next, the drive of the moving unit 300 is controlled by the control unit 50 based on the bevel formation data (bevel locus), the peripheral edge of the lens LE after roughing is processed by the finishing tool 164, and the bevel is formed on the peripheral edge of the lens LE. It is formed.

In the above, the bevel setting considering the warp angle α of the spectacle frame has been described, but if necessary, the optical axis direction of the lens LE in the vertical direction is set to the visual axis direction of the wearer's eye in consideration of the forward tilt angle of the spectacle frame. You may make the same bevel setting. For example, as shown in FIG. 11, the forward tilt angle β is generally defined as the angle in the line segment direction connecting the upper end FR3 and the lower end FR4 of the rim FR with respect to the vertical direction. For example, the forward tilt angle β of the spectacle frame can be obtained from a photographed image of the side surface of the wearer's face while wearing the spectacle frame. The value of the forward tilt angle β is acquired by the data acquisition unit 10 by being input by the data input unit 13.

For example, in the setting of the bevel locus in consideration of the forward tilt angle β, the warp angle α of the spectacle frame shown in FIG. You can replace it and calculate. That is, the control unit 50 obtains the optical axis direction of the spectacle lens at the time of bevel formation based on the positional relationship between the spherical geometric center of the layout data and the optical center of the spectacle lens and the curve information of the spectacle lens. Next, the control unit 50 obtains the positional relationship between the upper bevel position and the lower bevel position in the edge direction of the spectacle lens corresponding to the lens shape based on the optical axis direction and the forward tilt angle β. Calculate the bevel formation data that makes the optical axis direction of the lens the same as the visual axis direction of the wearer's eye in the vertical direction when wearing spectacles.

Regarding the sameness between the optical axis direction of the lens LE in the vertical direction and the visual axis direction of the wearer's eye, it may not always be necessary to set the bevel in consideration of the forward tilt angle β. Normally, the angle of the normal line of sight (downward inclination with respect to the horizontal direction) in a person's daily life is about 5 to 10 degrees, and the forward tilt angle of the spectacle frame is designed to match the angle of the normal line of sight. Also, at optician stores, the forward tilt angle is adjusted according to the wearer when fitting the spectacle frame. Therefore, it may not be necessary to make the optical axis direction of the lens LE the same as the visual axis direction of the wearer's eye by beveling processing as in the left-right direction.

In general, the lens shape (rim shape) is often longer in the left-right direction than in the up-down direction. For this reason, in the case of a minus lens, the edge thickness in the vertical direction is thinner than the edge thickness in the horizontal direction, and in the vertical direction, the bevel position that fits in the edge thickness is limited, and the bevel position considering the forward tilt angle cannot be arranged. be. In this case, the bevel formation may be performed in consideration of the forward tilt angle in the left-right direction. On the other hand, in the case of a plus lens, the edge thickness in the left-right direction is thinner than the edge thickness in the vertical direction, and in the left-right direction, the bevel position that fits in the edge thickness is limited, and it may not be possible to arrange the bevel position in consideration of the warp angle. .. In this case, the bevel formation may be performed in consideration of the forward tilt angle in the vertical direction.

In the above description, the case where the bevel is formed on the lens LE has been described, but the same concept as the bevel formation can be applied to the case where the groove is formed on the lens LE in order to hold the lens LE on the half rim with nylol. In this case, the calculation related to the bevel in the above embodiment may be replaced with a groove. For example, the provisional bevel loci YC1 and YC2 shown in FIG. 6 are replaced with groove loci, the nasal bevel position YPn1 is replaced with the nasal groove position, and the ear bevel position YP2e is the ear groove position. Is replaced by. Further, the upper bevel position LPu1 shown in FIG. 9 is also replaced with the upper groove position.

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 10 Data acquisition unit 13 Data input unit 50 Control unit 100 Lens holding unit 102 Lens chuck shaft 150 Processing tool unit 168 Processing tool 200 Lens shape measurement unit 300 Moving unit

Claims (8)

A spectacle lens processing device that forms a bevel or groove on the periphery of the spectacle lens to hold the spectacle lens on the rim of the spectacle frame.
Warp angle acquisition means for acquiring the warp angle of the spectacle frame,
A lens shape acquisition means for acquiring lens shape information including edge positions of the anterior refracting surface and the posterior refracting surface of a spectacle lens corresponding to a lens shape, and a lens shape acquiring means.
Layout data acquisition means for acquiring layout data of the positional relationship of the optical center of the spectacle lens with respect to the lens shape,
It is a calculation means for obtaining bevel or groove formation data formed on the peripheral edge of the spectacle lens based on the lens shape and the lens shape information, and further, based on the layout data and the warp angle, the optical axis direction of the spectacle lens. With a calculation means for calculating bevel or groove formation data that is the same as the visual axis direction of the wearer's eye when wearing spectacles.
A spectacle lens processing apparatus characterized by being equipped with. In the spectacle lens processing apparatus of claim 1,
The lens shape information includes curve information of the front refraction surface of the spectacle lens.
The calculation means determines the optical axis direction of the spectacle lens at the time of forming a bevel or a groove based on the positional relationship between the spherical geometric center of the layout data and the optical center of the spectacle lens and the curve information of the spectacle lens. Based on the obtained optical axis direction and the warp angle, the positional relationship between the position of the bevel or groove on the nasal side and the position of the bevel or groove on the ear side in the edge direction of the spectacle lens corresponding to the lens shape is obtained. A spectacle lens processing apparatus for calculating bevel or groove formation data that makes the optical axis direction of the spectacle lens the same as the visual axis direction of the wearer's eye when wearing spectacles. In the spectacle lens processing apparatus of claim 2,
A bevel or groove curve acquisition means for acquiring curve information of a bevel or groove formed on the peripheral edge of an spectacle lens is provided.
The calculation means calculates the formation data of the bevel or groove so that the curve of the bevel or groove passes through the position of the bevel or groove on the nose side and the position of the bevel or groove on the ear side. A featured spectacle lens processing device. In the spectacle lens processing apparatus of claim 2,
The calculation means obtains temporary bevel formation data based on the edge position of the spectacle lens corresponding to the lens shape, and refers to one of the position of the bevel or groove on the nose side and the position of the bevel or groove on the ear side. A spectacle lens processing apparatus for obtaining bevel or groove formation data by inclining the provisional bevel or groove formation data so as to approach the other. In the spectacle lens processing apparatus of claim 1,
A rim data acquisition means for acquiring at least the front edge data of the rim with respect to the groove position of the rim is provided.
The calculation means corrects the bevel or groove formation data so that the positional relationship between the front end of the rim and the front refracting surface of the spectacle lens approaches a predetermined reference when the rim holds the spectacle lens. A spectacle lens processing device characterized by this. In the spectacle lens processing apparatus of claim 1,
Equipped with a forward tilt angle acquisition means for acquiring the forward tilt angle of the spectacle frame,
Based on the layout data and the forward tilt angle, the calculation means calculates bevel or groove formation data that makes the optical axis direction of the spectacle lens in the vertical direction the same as the visual axis direction of the wearer's eye when wearing spectacles. A spectacle lens processing device characterized by this. In the spectacle lens processing apparatus of claim 6,
The lens shape information includes curve information of the front refraction surface of the spectacle lens.
The calculation means determines the optical axis direction of the spectacle lens at the time of forming a bevel or a groove based on the positional relationship between the spherical geometric center of the layout data and the optical center of the spectacle lens and the curve information of the spectacle lens. Based on the obtained optical axis direction and the anteversion angle, the positional relationship between the position of the upper bevel or groove and the position of the lower bevel or groove in the edge direction of the spectacle lens corresponding to the lens shape is obtained. A spectacle lens processing apparatus, characterized in that it calculates bevel or groove formation data that makes the optical axis direction of the spectacle lens in the vertical direction the same as the visual axis direction of the wearer's eye when wearing spectacles. Warp angle acquisition means for acquiring the warp angle of the spectacle frame, lens shape acquisition means for acquiring lens shape information including edge positions of the anterior and posterior refracting surfaces of the spectacle lens corresponding to the lens shape, and spectacles for the spectacle shape. A spectacle lens processing apparatus comprising a layout data acquisition means for acquiring layout data of the positional relationship of the optical center of the lens, and forming a bevel or a groove for holding the spectacle lens on the rim of the spectacle frame on the peripheral edge of the spectacle lens. A lens or groove formation data setting program to be executed.
It is a calculation step for obtaining data on the formation of a bevel or a groove formed on the peripheral edge of the spectacle lens based on the lens shape and the lens shape information, and further, based on the layout data and the warp angle, the optical axis direction of the spectacle lens. The formation of a bevel or groove is characterized in that the calculation unit of the spectacle lens processing apparatus executes a calculation step of calculating the formation data of the bevel or groove that is the same as the visual axis direction of the wearer's eye when wearing the spectacles. Data setting program.

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