JP6652002B2 - Eyeglass lens processing apparatus and processing control data creation program - Google Patents

Description

  The present disclosure relates to a spectacle lens processing apparatus capable of forming a hole in a lens of spectacles, and a processing control data generating program for generating processing control data of the spectacle lens processing apparatus.

  2. Description of the Related Art In order to attach a rimless frame (sometimes referred to as a two-point frame) to a lens of eyeglasses, an eyeglass lens processing apparatus that forms a hole in the lens is known. For example, the eyeglass lens processing apparatus described in Patent Literature 1 determines the angle of the hole formed in the lens so as to be perpendicular to the angle of the lens surface at the position where the hole is formed. Further, the spectacle lens processing apparatus described in Patent Literature 2 determines the angle of the hole formed in the lens so as to be perpendicular to the angle of the surface of the demo lens on which the rimless frame is mounted. Further, in the eyeglass lens processing apparatus described in Patent Literature 2, the operator can arbitrarily set each of the horizontal (X-axis direction) tilt angle and the vertical (Y-axis direction) tilt angle of the hole formed in the lens. Can also be set.

JP 2003-145328 A JP 2008-30181 A

  In order to improve the appearance of the user when wearing spectacles, it is preferable that the line of sight (the visual axis) of the user and the optical axis of the lens be as close as possible. By adjusting the tilt angle when adjusting the spectacles according to the user, the line of sight of the user and the optical axis of the lens can be easily approached. For example, when the user looks at an object at a short distance, the line of sight of the user is likely to be inclined downward from the horizontal direction. Therefore, in near-sighted glasses for mainly viewing a short-distance object, the optical axis of the lens is tilted downward with respect to the visual axis of the user when viewing the front (that is, the lens is tilted forward). 2), the tilt angle may be adjusted.

  In the method of determining the angle of the hole only according to the shape of the lens (for example, the angle of the surface of the lens to be processed or the demonstration lens), the operator cannot adjust the tilt angle. On the other hand, in the method of setting the hole angle arbitrarily, the operator can set the hole angle in consideration of the tilt angle, but the contents of the setting, the setting procedure, and the method of determining the numerical value to be set, etc. It gets complicated. That is, in the conventional eyeglass lens processing apparatus, it is difficult to appropriately form a hole having an angle that takes the tilt angle into consideration into the lens.

  A typical object of the present disclosure is to provide an eyeglass lens processing apparatus and a processing control data creation program for appropriately forming a hole having an angle in which a tilt angle is considered in a lens.

  An eyeglass lens processing apparatus provided by a typical embodiment according to the present disclosure is an eyeglass lens processing apparatus including a drilling tool for forming a hole in a lens, and a hole position for acquiring a position of a hole to be formed in the lens. Acquisition means and the angle of the optical axis of the lens in the vertical plane with the visual axis of the user when the user looks at the front while wearing spectacles with the lens attached after processing. A tilt angle obtaining means for obtaining an angle, and a relative angle between the drilling tool and the lens when forming a hole at the position of the hole in the lens, based on the tilt angle obtained by the tilt angle obtaining means. Relative angle determination means for determining the angle.

  A processing control data creation program provided by a typical embodiment of the present disclosure is provided by a data creation device to create processing control data used in an eyeglass lens processing device having a drilling tool for forming a hole in a lens. A machining control data creation program to be executed, wherein the hole is acquired by acquiring a position of a hole to be formed in the lens by being executed by a control unit of the data creation device; When the user wears the spectacles and looks at the front, the visual axis of the user, a tilt angle obtaining step of obtaining a tilt angle that is an angle in a vertical plane of the optical axis of the lens, When forming a hole at the position of the hole in the lens, the relative angle between the drilling tool and the lens was obtained by the tilt angle obtaining means. And relative angle determining step of determining, based on the cage angle, the to be executed by the data creation device.

  According to the eyeglass lens processing apparatus and the processing control data creation program according to the present disclosure, a hole having an angle in which the tilt angle is considered is appropriately formed in the lens.

FIG. 2 is a schematic configuration diagram of a processing mechanism of the eyeglass lens processing apparatus 1. It is the figure which looked at the 2nd processing tool unit 400 from the side. FIG. 2 is a block diagram illustrating an electrical configuration of the eyeglass lens processing apparatus 1. It is a flowchart of a processing control data creation process. FIG. 3 is a side view of the glasses worn by the user. It is a top view of the glasses in the state which the user wore. It is a schematic diagram which shows the relationship of the 1st relative angle A1 before reflection angle reflection, and the 2nd relative angle A2 after reflection angle reflection. It is a figure showing the state where lens holding shafts 102R and 102L hold lens LE by an optical center. It is a figure showing the state where lens holding shafts 102R and 102L hold lens LE at a position other than the optical center.

<Overview>
A first aspect of an eyeglass lens processing apparatus exemplified in the present disclosure includes a control unit that controls processing. The control unit acquires a position and a tilt angle of a hole formed in the lens. The tilt angle is the angle in the vertical plane between the user's visual axis and the optical axis of the lens when the user looks at the front while wearing spectacles to which the processed lens is attached. The control unit determines a relative angle between the drilling tool and the lens (hereinafter, also referred to as a “hole angle”) when forming the hole at the position of the obtained hole based on the obtained tilt angle. . Therefore, a hole having an angle in which the tilt angle is considered is appropriately formed in the lens.

  The control unit may acquire the tilt angle specified by the operator operating the operation unit. In this case, the operator can easily and appropriately form a hole having a desired tilt angle in the eyeglass lens processing apparatus.

  The method by which the operator specifies the tilt angle can be appropriately selected. For example, a method of directly inputting a tilt angle value, a method of specifying one of a plurality of tilt angle candidate values (for example, 5 degrees, 10 degrees, 15 degrees, etc.), a method of using glasses (for example, For example, a method of designating one of distance use, regular use, near use, etc.) can be adopted. When one of the spectacle usage patterns is designated, a tilt angle may be associated with each usage pattern in advance (for example, 5 degrees for distance use, 10 degrees for normal use, and 15 degrees for near use). Degrees). In addition, the control unit may determine the hole angle based on one appropriate predetermined tilt angle without using the tilt angle specified by the operator.

  The control unit may determine the relative angle between the drilling tool and the lens based on the shape of the lens to be processed, or the shape of the demo lens attached to the rimless frame, the position of the hole, and the tilt angle. . In this case, the hole angle that matches the shape of the lens to be processed or the demo lens and that takes into account the tilt angle is appropriately determined.

  In detail, the control unit determines a temporary relative angle that does not reflect the tilt angle information based on the shape of the lens to be processed or the shape of the demo lens attached to the rimless frame and the position of the hole. May be determined. The control unit may determine the relative angle when the hole is actually formed by correcting the temporary relative angle based on the acquired tilt angle.

  Note that a method of determining the temporary relative angle can be appropriately selected. For example, a method of making the angle of the hole perpendicular to the lens surface at the position of the hole in the lens (worked lens or demo lens), a method of making the angle of the hole a predetermined angle with respect to the angle of the lens edge, and the like can be adopted. Alternatively, the relative angle may be directly determined based on the lens shape, the position of the hole, and the tilt angle without going through the procedure of determining the temporary relative angle.

  The control unit may acquire the sled angle. The warp angle is an angle in the horizontal plane between the user's visual axis and the optical axis of the lens when the user looks at the front while wearing spectacles to which the processed lens is attached. The control unit may correct the displacement of the astigmatic axis of the lens that varies according to the tilt angle based on the tilt angle and the slew angle. In the case where the tilt angle is provided, the astigmatism axis is likely to shift as the sled angle increases. Therefore, the deviation of the astigmatic axis is appropriately corrected by considering both the tilt angle and the warp angle. Therefore, even when the tilt angle is adjusted, occurrence of displacement of the astigmatic axis is suppressed.

  Note that a method of correcting the displacement of the astigmatic axis can be appropriately selected. For example, the displacement of the astigmatic axis may be corrected by correcting the angle in the rotation direction of the lens when the lens is held by the lens chuck shaft. Further, the deviation of the astigmatic axis may be corrected by correcting the relative angle (hole angle) between the drilling tool and the lens. Further, the deviation of the astigmatic axis may be corrected by correcting the hole angle and the hole position.

  The control unit may limit the range of the adjustable tilt angle according to the type of the fastener of the rimless frame. For example, in the case of a fastener for fixing a lens with one hole, the tilt angle can be easily adjusted by adjusting the hole angle. On the other hand, it may be difficult to adjust the tilt angle with a fastener or the like that fixes the lens with a plurality of holes arranged in the vertical direction. By limiting the range of the adjustable tilt angle according to the type of the fastener, the possibility that a hole that is not suitable for the type of the fastener is formed in the lens is reduced.

  A second aspect of the eyeglass lens processing apparatus exemplified in the present disclosure includes a control unit that controls an operation. The control unit acquires a position of a hole formed in the lens. The control unit determines the relative angle between the drilling tool and the lens when forming the hole at the acquired hole position, based on the angle of the lens held by the lens holding shaft. As a result, the effect of the change in the angle of the lens held by the lens holding shaft is reduced, and a hole having an appropriate angle is formed in the lens.

  The control unit may acquire lens angle information obtained by measuring the shape of the lens held by the lens holding shaft. The control unit may determine the relative angle based on the angle information. In this case, the influence of the angle change of the lens held by the lens holding shaft can be more appropriately reduced.

  Note that a method of acquiring the held lens angle information can be appropriately selected. For example, the spherical shape of the lens surface of the held lens may be measured by a lens shape measuring device. In this case, the control unit fits a virtual sphere to the measured lens surface, and specifies a virtual line passing through the center of the fitted sphere and the position (chuck position) of the lens held by the lens holding shaft. May be. The control unit may acquire the angle information based on the angle of the virtual line. Further, the positions of a plurality of points in the edge portion of the held lens may be measured by a lens shape measuring device. In this case, the control unit may obtain a virtual plane passing through the measured positions of the plurality of points, and acquire angle information based on the angle of the plane.

  The control unit may determine the relative angle between the drilling tool and the lens without acquiring the lens angle information. In this case, for example, the control unit adjusts the angle of at least one of the drilling tool and the lens holding shaft until the relative angle between the lens and the drilling tool becomes an appropriate angle, thereby controlling the relative angle between the drilling tool and the lens. May be determined to be an appropriate angle.

  The control unit may acquire, as angle information, a deviation of the angle of the actually held lens from the angle of the lens when the lens is held at the optical center by the lens holding axis. The control unit may determine the relative angle based on the acquired angle shift. In this case, even if the lens is held at a position other than the optical center, the effect of the angle change of the lens is appropriately suppressed.

  Note that a method of acquiring the deviation of the lens angle can be appropriately selected. For example, the control unit may obtain the above-described deviation of the angle between the virtual line and the lens holding axis as the deviation of the lens angle. In addition, the control unit may acquire the deviation of the angle between the lens perpendicular to the virtual plane and the lens holding axis as the deviation of the lens angle.

  The control unit determines a temporary relative angle between the drilling tool and the lens when the lens is held at the optical center by the lens holding axis, and corrects the determined temporary relative angle according to the deviation of the lens angle. Alternatively, the relative angle when the hole is actually formed may be determined. In this case, even if the lens is held at a position other than the optical center, the effect of the angle change of the lens is appropriately suppressed.

  When determining the relative angle between the drilling tool and the lens, it is not necessary to always use the angle of the drilling tool and the angle of the lens held by the lens holding shaft to determine the relative angle. For example, by determining the angle of the drilling tool and the angle of the lens holding axis, the control unit can naturally determine the relative angle between the drilling tool and the lens held by the lens holding axis. When the angle of the lens held by the lens holding shaft fluctuates, the control unit uses the angle of the drilling tool, the angle of the held lens, and the angle of the lens holding shaft. Alternatively, the relative angle between the drilling tool and the lens may be determined. That is, regardless of the specific method of determining the angle, if the relative angle between the drilling tool and the lens becomes an appropriate angle, a hole having an appropriate angle is formed in the lens.

<Embodiment>
Hereinafter, one of exemplary embodiments of the present disclosure will be described with reference to the drawings. As shown in FIG. 1, an eyeglass lens processing apparatus 1 of the present embodiment includes a lens holding unit 100, a lens shape measuring unit 200, a first processing tool unit 300, and a second processing tool unit 400.

  The lens holding unit 100 includes lens holding shafts (lens chuck shafts) 102R and 102L that sandwich and hold the lens LE. Further, the lens holding unit 100 includes a lens rotating unit 100a, a holding axis moving unit 100b, and an inter-axis distance changing unit 100c.

  The lens rotation unit 100a rotates the pair of lens holding shafts 102R and 102L around their axes. The holding shaft moving unit 100b moves the lens holding shafts 102R and 102L in the axial direction (this is defined as the X direction). The inter-axis distance changing unit 100c moves the lens holding shafts 102R and 102L closer to the rotation axes of processing tools (details will be described later) provided in each of the first processing tool unit 300 and the second processing tool unit 400. Alternatively, it is moved in the direction of separating (this is referred to as the Y direction). The inter-axis distance changing unit 100c changes the distance between the lens shape measuring unit 200 and the lens holding shafts 102R and 102L.

  Hereinafter, specific examples of each configuration in the eyeglass lens processing apparatus 1 will be described in detail. The lens holding unit 100 is mounted on a base 170 of the main body of the eyeglass lens processing apparatus 1.

  The lens rotation unit 100a will be described. The lens holding shaft 102R is held on the right arm 101R of the carriage 101 of the lens holding unit 100, and the lens holding shaft 102L is held on the left arm 101L so as to be rotatable and coaxial with each other. When the lens holding shaft 102R is moved toward the lens holding shaft 102L by the motor 110 attached to the right arm 101R, the lens LE is held between the two lens holding shafts 102R and 102L. The two lens holding shafts 102R and 102L are synchronously rotated by a motor 120 attached to the right arm 101R.

  The holding axis moving unit 100b will be described. An X-axis movement support base 140 is provided on shafts 103 and 104 extending in parallel with the lens holding shafts 102R and 102L and the grindstone rotating shaft 161a. The X-axis movement support base 140 can move in the X-axis direction along the shafts 103 and 104 by the power of the X-axis movement motor 145. The carriage 101 is mounted on the X-axis moving support base 140. An encoder 146 (see FIG. 3) is provided on the rotation axis of the X-axis movement motor 145. In the present embodiment, the positions in the X direction of the lens holding shafts 102R and 102L detected by the encoder 146 are used to measure the shapes of the front surface and the rear surface of the lens LE.

  The inter-axis distance changing unit 100c will be described. A shaft 156 extending in a direction connecting the lens holding shafts 102R and 102L and the grindstone rotating shaft 161a is fixed to the X-axis moving support base 140. When the Y-axis moving motor 150 rotates, the ball screw 155 extending in the Y direction rotates. As a result, the carriage 101 moves in the Y-axis direction along the shaft 156. An encoder 158 that detects the position of the carriage 101 in the Y direction is provided on the rotation axis of the Y-axis movement motor 150.

  The lens shape measuring unit 200 will be described. The lens shape measuring unit 200 of the present embodiment is fixed to the base 170 at a position opposite to the first processing tool unit 300 via the carriage 101. The lens shape measuring unit 200 includes a lens edge position measuring unit 200F and a lens edge position measuring unit 200R. The lens edge position measuring unit 200F has a tracing stylus that comes into contact with the front surface of the lens LE. The lens edge position measuring unit 200R has a tracing stylus that is in contact with the rear surface of the lens LE. The carriage 101 is moved in the Y-axis direction based on the lens shape data while the tracing styluses of the lens edge position measuring units 200F and 200R are in contact with the front and rear surfaces of the lens LE, and the lens holding shafts 102R and 102L are moved. By being rotated, the edge positions of the front surface and the rear surface of the lens LE are measured simultaneously. As the configuration of the lens edge position measurement units 200F and 200R, for example, the configuration described in JP-A-2003-145328 can be used.

  The first processing tool unit 300 will be described. The first processing tool unit 300 includes a peripheral processing tool 168 which is one of the lens processing tools. The peripheral processing tool 168 of this embodiment includes a rough grinding stone 162 for glass, a finishing grindstone 164 having a V-groove (bevel groove) for forming a bevel on the lens and a flat processing surface, a grinding wheel 165 for flat mirror surface finishing, and a high-curve lens. A finishing grindstone 166, a plastic rough grindstone 167, and the like are provided. The plurality of grindstones of the peripheral edge processing tool 168 are coaxially mounted on a grindstone rotation shaft (grindstone spindle) 161a. The grindstone rotation shaft 161a is rotated by the motor 160. The periphery of the lens LE held by the lens holding shafts 102L and 102R is pressed against the first lens processing tool 168 and processed.

  The second processing tool unit 400 will be described. As shown in FIG. 2, the second processing tool unit 400 includes a finishing processing tool 430, a drilling tool 440, a first turning unit 470, a second turning unit 480, a motor 421, and the like. The finishing tool 430 and the drilling tool 440 are connected and held by a holding unit 410. The finishing tool 430 performs a finishing process (for example, at least one of a grooving process, a bevel forming process, and a step forming process) on the periphery of the lens LE by rotating around the rotation axis around the axis.

  The drilling tool 440 forms a hole in the lens LE. The hole drilling tool 440 according to the present embodiment forms a hole extending in the axial direction in the lens LE by moving in the axial direction while rotating around the rotation axis about the axis. Therefore, the angle of the hole formed in the lens LE changes according to the relative angle between the rotation axis of the drilling tool 440 and the lens LE. That is, in the present embodiment, the angle of the hole formed in the lens LE is determined according to the drilling direction of the drilling tool 440 with respect to the lens LE (in the present embodiment, the axial direction of the rotation axis). However, the configuration of the drilling tool 440 can be changed as appropriate. For example, a drilling tool that forms a hole in the lens LE by emitting a laser may be used. In this case, the drilling direction is the laser emission direction. Further, a drilling tool for forming a hole in the lens LE by injecting water at a high pressure may be used. In this case, the drilling direction is the water spraying direction.

  The rotating shaft of the drilling tool 440 in the present embodiment is connected to the rotating shaft of the finishing tool 430 via a clutch (not shown) inside the holding unit 410. When the motor 421 rotates in one direction, the rotation axis of the finishing tool 430 rotates. When the motor 421 rotates in the opposite direction, the transmission destination of the power of the motor 421 is changed to the rotation axis of the drilling tool 440 by the clutch, and the rotation axis of the drilling tool 440 rotates.

  The first turning unit 470 includes a motor 471. When the motor 471 rotates, the finishing tool 430 and the drilling tool 440 turn around a turning axis A1 extending in a substantially vertical direction. Further, the second turning unit 480 includes a motor 482. When the motor 482 rotates, the finishing tool 430 and the drilling tool 440 pivot about a pivot axis A2 that is not parallel to the pivot axis A1. Therefore, the eyeglass lens processing apparatus 1 of the present embodiment can change the angle of the drilling tool 440 with respect to the lens LE by driving the first turning unit 470 and the second turning unit 480. That is, the spectacle lens processing apparatus 1 of the present embodiment changes the drilling direction of the drilling tool 440 (in the present embodiment, the axial direction of the rotation axis of the drilling tool 440) while the angle of the lens LE is fixed. This changes the relative angle between the drilling tool 440 and the lens LE.

  However, the method of changing the relative angle between the drilling tool 440 and the lens LE can be changed as appropriate. For example, the spectacle lens processing apparatus 1 changes the angle of the lens holding shafts 102R and 102L (the axial direction of the lens holding shafts 102R and 102L) in a state where the drilling direction of the drilling tool 440 is fixed, so that the drilling tool The relative angle between 440 and lens LE may be changed. Further, the eyeglass lens processing apparatus 1 may change both the drilling direction of the drilling tool 440 and the angles of the lens holding shafts 102R and 102L.

  The electrical configuration of the eyeglass lens processing apparatus 1 will be described with reference to FIG. The eyeglass lens processing device 1 includes a CPU (processor) 5 that controls the eyeglass lens processing device 1. The RAM 5, the ROM 7, the nonvolatile memory 8, the operation unit 50, the display 55, and the external communication I / F 59 are connected to the CPU 5 via a bus. Further, the CPU 5 includes various devices such as the aforementioned motors (motor 110, motor 120, X-axis moving motor 145, Y-axis moving motor 150, motor 160, motor 421, motor 471, motor 482, encoder 146, encoder 146, 158) are connected via a bus.

  The RAM 6 temporarily stores various information. The ROM 7 stores various programs, initial values, and the like. The non-volatile memory 8 is a non-transitory storage medium (for example, a flash ROM, a hard disk drive, or the like) that can hold stored contents even when power supply is cut off. The non-volatile memory 8 stores a control program for controlling the operation of the eyeglass lens processing apparatus 1 (for example, a processing control data creation program for executing the processing control data creation processing shown in FIG. 4). Is also good. The operation unit 50 receives input of various instructions from an operator. For example, a touch panel provided on the surface of the display 55, an operation button, or the like may be used as the operation unit 50. The display 55 can display various information such as the shape of the lens LE and the shape of the frame. The external communication I / F 59 connects the eyeglass lens processing device 1 to an external device.

  The CPU 5 appropriately processes the lens LE by controlling the driving of various motors and the like according to the processing control data. As an example, in the present embodiment, the eyeglass lens processing apparatus 1 itself generates the processing control data. Specifically, in the present embodiment, the control unit (including the CPU 5) of the spectacle lens processing apparatus 1 executes the processing control data generation program to generate at least a part of the processing control data. That is, in the present embodiment, the spectacle lens processing device 1 also functions as a data generation device that generates processing control data. However, devices other than the eyeglass lens processing apparatus 1 may function as the data creation apparatus. For example, a personal computer connected to the eyeglass lens processing device 1 may function as the data creation device. In this case, the control unit of the personal computer executes the machining control data creation program to create the machining control data.

  With reference to FIG. 4 to FIG. 9, a description will be given of the processing control data creation processing executed by the control unit (CPU 5) of the present embodiment. In the processing control data creation processing illustrated in FIGS. 4 to 9, at least the relative angle between the drilling tool 430 and the lens LE when forming a hole in the lens LE using the drilling tool 430 is determined. The angle of the hole formed in the lens LE is determined by the relative angle between the drilling tool 430 and the lens LE. Therefore, in the following description, the relative angle between the drilling tool 430 and the lens LE may be referred to as “hole angle”.

  First, the CPU 5 inputs an instruction from an operator for selecting the hole angle setting mode (S1). The hole angle setting mode is a mode for determining a basic setting method of the hole angle. As an example, in the present embodiment, the worker can select one of the hole angle setting modes of “following a lens to be processed”, “following a demo lens”, “edge angle”, and “specifying an arbitrary angle”. For example, the CPU 5 may input an instruction for selecting the hole angle setting mode by causing the operator to operate the operation unit 50 while displaying the plurality of hole angle setting modes on the display 55.

  Note that, in the “following of a lens to be processed”, a basic method is adopted such that the angle of a hole to be formed (that is, the angle in the direction of drilling by a drilling tool) is perpendicular to the lens surface of the lens LE to be processed. A hole angle (a hole angle before correction based on the tilt angle and the angle of the lens LE) is set. In “demo lens copying”, a basic hole angle is set so that the angle of the hole formed is perpendicular to the surface of the demo lens attached to the rimless frame. In the “edge angle”, a basic hole angle is set such that the angle of the hole becomes a predetermined angle with respect to the angle of the edge portion of the lens LE to be processed. The angle of the hole relative to the angle of the edge may be changeable. In “arbitrary angle specification”, the operator can arbitrarily specify the angle of the hole with respect to the lens LE. Hereinafter, a case will be described in which a mode in which the basic hole angle is set based on the lens shape (that is, any one of “working lens copying”, “demo lens copying”, and “edge angle”) is selected. .

  Note that when “follow processing lens” and “follow demo lens” are selected, the CPU 5 may specify the shape of the lens surface by any method. For example, the CPU 5 may specify the surface shape of the lens based on the curve value of the lens, or may specify the surface shape of the lens based on the radius of curvature of the surface curve. Information on the surface shape of the lens may be input by an operator, for example, or may be acquired by measuring the shape of the lens LE by the lens shape measurement unit 200.

  Next, the CPU 5 acquires information on the type of the fastener provided in the rimless frame (S2). Examples of the information on the type of the fastener include, for example, the number of pins to be inserted into holes formed in the lens LE, the arrangement of the pins when a plurality of pins are provided, and the presence or absence of a flap that contacts the edge of the lens LE. And / or at least one of the contact position of the lens LE and the like in the lens LE may be acquired.

  Next, the CPU 5 acquires the position of the hole formed in the lens LE (S3). As an example, in the present embodiment, the position of the hole on the front surface of the lens LE when the lens LE is viewed from the front side in the optical axis direction of the lens LE is acquired. The method of acquiring the hole position by the CPU 5 can be appropriately selected. For example, the CPU 5 may cause a worker to operate the operation unit 50 to specify a hole position. The CPU 5 may acquire the hole position by acquiring information on the distance from the edge of the lens LE to the hole. Further, the CPU 5 may acquire the position of the hole of the demo lens attached to the rimless frame as the position of the hole formed in the lens LE.

  Next, the CPU 5 acquires information on the tilt angle (S4). The tilt angle is an angle between the visual axis of the user and the optical axis of the lens LE in the vertical plane when the user wears the glasses to which the processed lens LE is attached and looks at the front. As shown in the side view of the glasses 70 in FIG. 5, when the visual axis when the user looks at the front is EX and the optical axis of the lens LE is OX, the angle between EX and OX in the vertical plane (from the side) Angle when viewed) AG is the tilt angle. In general, the tilt angle is often adjusted so that the optical axis OX of the lens LE is inclined forward and obliquely downward from the visual axis EX. Therefore, the tilt angle is sometimes referred to as the forward tilt angle. According to “JIS T 7330”, the forward tilt angle is defined as “the angle in the vertical plane between the optical axis of the lens and the visual axis (usually in the horizontal direction) of the eye in the first eye position”. Also, a plane perpendicular to the front direction of the glasses is referred to as a “vertical plane”, and a plane of the lens surface of the lens LE that is in contact with a point through which the optical axis passes is referred to as a “lens reference plane”. In this case, the tilt angle can also be expressed as the angle between the vertical plane when the eyeglasses are viewed from the side and the reference plane of the lens.

  In the present embodiment, an operator who processes the lens LE specifies an appropriate tilt angle by operating the operation unit 50. In S4, the CPU 5 acquires the tilt angle specified by the operator. Therefore, the operator can set an appropriate tilt angle according to the manner in which the glasses are used. The method by which the operator specifies the tilt angle can be appropriately selected. For example, the operator may directly input the value of the tilt angle. Further, the operator may select one of a plurality of candidate values of the tilt angle (for example, 5 degrees, 10 degrees, 15 degrees, etc.). Further, the operator may select one of the usage modes of the glasses (for example, distance use, regular use, near use, etc.). In this case, an appropriate tilt angle may be associated with each usage mode in advance.

  In S4 of the present embodiment, the CPU 5 limits the range of the adjustable tilt angle according to the type of the fastener acquired in S2. For example, if the number of pins inserted into the hole of the lens LE is plural, it may be more difficult to adjust the tilt angle as compared with the case where the number of pins is one. Further, even when the number of pins is plural, it is more difficult to adjust the tilt angle if a plurality of pins are arranged in a vertical direction than in a case where a plurality of pins are arranged in a horizontal direction. Further, when the contact position of the lens on the lens LE is above or below the lens LE, it is more difficult to adjust the tilt angle than when the contact position is on the left or right of the lens LE. The CPU 5 of the present embodiment can reduce the possibility that a hole not suitable for the type of the fastener is formed in the lens LE by limiting the range of the adjustable tilt angle according to the type of the fastener. . In addition, the range of the adjustable tilt angle may be predetermined according to the type of the fastener, or may be set by the operator for each type of the fastener. The limitation of the range of the adjustable tilt angle also includes prohibiting the adjustment of the tilt angle when the fastener is of a specific type.

  Next, the CPU 5 acquires information on the sled angle (S5). The warp angle is an angle in the horizontal plane between the visual axis of the user and the optical axis of the lens LE when the user wears the glasses to which the processed lens LE is attached and looks at the front. As shown in the plan view of the glasses 60 in FIG. 6, the visual axis EX when the user looks at the front and the angle SG in the horizontal plane of the optical axis OX of the lens LE (the angle when viewed from above) SG. Corners. In addition, when the above-described “vertical plane” and “lens reference plane” are used, the warp angle can be expressed as an angle between the vertical plane and the lens reference plane when the eyeglasses are viewed from above or below.

  Next, the CPU 5 determines a first relative angle A1, which is a basic hole angle, based on the lens shape and the hole position (S6). In the present embodiment, as described above, the first relative angle A1 is determined according to the hole angle setting mode selected by the operator. In other words, if “copying a processed lens”, “copying a demo lens”, or “edge angle” is selected as the hole angle setting mode, the surface shape of the lens (the processed lens LE or the demo lens) or the shape of the edge portion and the hole The first relative angle A1 is determined based on the position. When “arbitrary angle designation” is selected, the first relative angle A1 is an angle designated by the operator. As described above, the first relative angle A1 is a temporary relative angle before correction based on the tilt angle and the angle of the lens LE is performed. Further, in S6 of the present embodiment, the relative angle A1 between the drilling tool 440 and the lens LE is determined assuming that the angle of the lens LE held by the lens holding shafts 102R and 102L does not deviate. You. More specifically, in S6 of the present embodiment, the provisional relative angle A1 between the drilling tool 440 and the lens LE when the lens LE is held at the optical center (the optical center of the lens LE) by the lens holding shafts 102R and 102L. It is determined.

  Next, the CPU 5 determines the second relative angle A2 reflecting the tilt angle by correcting the first relative angle A1 based on the tilt angle (S7). With reference to FIG. 7, a method for determining the relative angle (the second relative angle A2 in the present embodiment) based on the tilt angle will be described. In the example shown in FIG. 7, the axis that intersects the lens surface of the lens LE is the Z0 axis. An axis perpendicular to the Z0 axis and extending in the horizontal direction is defined as an X0 axis. An axis perpendicular to both the Z0 axis and the X0 axis is defined as a Y0 axis. The tilt angle is an angle at which the lens LE is tilted forward or backward. Accordingly, by rotating the vector indicating the first relative angle A1 by the tilt angle about an axis X ′ (which is an axis extending in the horizontal direction) which is parallel to the X0 axis and passes through the hole position, the tilt is increased. The second relative angle A2 reflecting the angle can be determined.

  An example of a calculation formula for calculating the second relative angle A2 after reflecting the tilt angle will be described. First, in the present embodiment, a vector is decomposed into two angle components. For example, let θ be an angle component formed by a straight line passing through the frame center (the geometric center of the lens shape) of the processed lens LE and the hole position and a vector in the hole direction (depending on the relative angle). An angle component in a direction of rotation about an axis passing through the hole position and parallel to the Z0 axis is defined as Φ. Decomposing the vector in the direction of the hole into two angle components (θ, Φ) facilitates the calculation of the relative angle. However, the method of decomposing a vector into two angle components can be changed. For example, the vector may be decomposed into an angle component in a direction parallel to the X0 axis and an angle component in a direction parallel to the Y0 axis. Note that the position of the frame center may be obtained, for example, as the center in the left-right direction and the center in the vertical direction of the lens shape. In addition, the center of the box (boxing center) when the lens is surrounded by a rectangular box may be obtained as the position of the frame center.

When the first relative angle A1 is decomposed into (θ1, Φ1), the second relative angle A2 (θ2, Φ2) after reflecting the tilt angle is obtained by, for example, the following formulas (1) and (2). However, it goes without saying that the calculation formula can be changed.
θ2 ≒ θ1 + (constant x tilt angle) (1)
Φ2 ≒ Φ1- (constant × tilt angle × tilt angle) (2)

  Next, when the lens LE is a lens that corrects astigmatism, the CPU 5 corrects the displacement of the astigmatic axis of the lens LE that varies according to the tilt angle based on the values of the tilt angle and the warp angle (S8). When the tilt angle is changed, the direction of the astigmatic axis of the lens LE processed and mounted on the rimless frame may be shifted from an appropriate direction. Furthermore, the larger the sled angle, the greater the deviation of the astigmatic axis when the tilt angle is changed. Therefore, by correcting the displacement of the astigmatic axis based on the values of the tilt angle and the warp angle, the displacement of the astigmatic axis is appropriately suppressed.

An example of a calculation formula for obtaining the correction amount of the displacement of the astigmatic axis and an example of the correction method will be described. The correction amount of the displacement of the astigmatism axis is obtained, for example, by the following formula (3). However, it goes without saying that the calculation formula can be changed.
Correction amount of astigmatic axis shift / constant x tilt angle x warp angle ... (3)

  Further, a specific method of correcting the displacement of the astigmatic axis based on the obtained correction amount can be appropriately selected. For example, the CPU 5 may offset the angle of the astigmatic axis of the lens LE by the correction amount from the angle of the astigmatic axis before correction when the lens LE is held by the lens holding axes 102R and 102L. In addition, the CPU 5 may correct the displacement of the astigmatic axis by rotating the layout of the target lenses arranged on the lens LE by the correction amount. In these cases, the CPU 5 may rotate the angle of the astigmatic axis or the lens layout of the lens LE around the optical center of the lens LE. Further, the CPU 5 may reduce the deviation of the astigmatic axis by changing the relative angle between the drilling tool and the lens LE. Further, the CPU 5 may reduce the displacement of the astigmatic axis by changing the relative angle and the position of the hole.

  Next, the CPU 5 acquires the angle information of the lens LE actually held by the lens holding shafts 102R and 102L (in other words, the angle information of the lens LE held by the lens holding shafts 102R and 102L) (S9). As an example, the CPU 5 of the present embodiment acquires a measurement result of the shape of the lens LE held by the lens holding shafts 102R and 102L, and acquires angle information of the lens LE based on the acquired measurement result. In the present embodiment, the shape of the lens LE is measured by the lens shape measuring unit 200 included in the eyeglass lens processing apparatus 1. However, the CPU 5 may acquire information on the shape of the lens LE measured by an external device (for example, a lens shape measuring device) via wired communication, wireless communication, or a removable memory.

  An example of a method for acquiring angle information of the lens LE from the measurement result of the shape of the held lens LE will be described with reference to FIGS. In the present embodiment, the CPU 5 acquires a measurement result of the surface shape (at least one of the front surface and the rear surface) of the held lens LE (for example, a result of measuring the surface shape along a lens shape formed on the lens LE). I do. Next, the CPU 5 applies the virtual sphere 75 along the surface shape of the lens LE, and specifies the center position O of the virtual sphere 75. Further, the CPU 5 specifies a straight line OH passing through the center position O of the virtual sphere 75 and the contact position (chuck position) H of the lens holding shafts 102R and 102L in the lens LE.

  FIG. 8 shows a state where the lens holding shafts 102R and 102L hold the lens LE sandwiched between the optical centers. In this case, since the lens holding shafts 102R and 102L vertically contact both the front and rear surfaces of the lens LE, the angle of the held lens LE is unlikely to change. Accordingly, in the example shown in FIG. 8, the center position O of the virtual sphere 75 is located on the holding axis C of the lens holding shafts 102R and 102L. That is, in the example shown in FIG. 8, the straight line OH and the holding axis C coincide. As described above, the first relative angle A1 and the second relative angle A2 determined in the present embodiment (that is, the relative angles at which the deviation of the angle of the held lens LE is not corrected) are determined by the lens holding shafts 102R and 102R. This is the relative angle between the drilling tool 440 and the lens LE when the lens LE is held at the optical center by 102L. Therefore, in the state shown in FIG. 8, it is not necessary to correct the drilling direction K of the drilling tool 440 with respect to the lens LE.

  FIG. 9 shows a state in which the lens holding shafts 102R and 102L sandwich and hold the lens LE at a position other than the optical center. The curve on the front surface and the curve on the rear surface of the lens LE are often different. Therefore, when the lens LE is held at a position other than the optical center, the lens holding shafts 102R and 102L rarely vertically contact both the front surface and the rear surface of the lens LE. In this case, the angle of the held lens LE may fluctuate. In the example illustrated in FIG. 9, the center position O of the virtual sphere 75 is not located on the holding axis C as a result of the change in the angle of the lens LE. That is, the straight line OH and the holding axis C intersect.

  The CPU 5 of the present embodiment controls the lens LE actually held by the lens holding shafts 102R and 102L with respect to the angle of the lens LE when the lens LE is held at the optical center by the lens holding shafts 102R and 102L (see FIG. 8). Is obtained as angle information. As an example, the CPU 5 of the present embodiment acquires a deviation α (see FIG. 9) of the angle of the straight line OH with respect to the holding axis C as angle information.

  Note that the method of obtaining the angle information of the lens LE can be changed. For example, the CPU 5 holds the positions of a plurality of points (for example, three or more points) of a ridge (for example, a ridge that becomes a boundary between the lens front surface and the lens side surface) of the lens LE held by the lens holding shafts 102R and 102L. It may be specified from the measurement result of the shape of the lens LE. In this case, the CPU 5 may specify a reference plane passing through the specified plural points. When the lens holding shafts 102R and 102L hold the lens LE with the optical center, the reference plane is perpendicular to the holding axis C. On the other hand, when the angle of the held lens LE changes, the reference plane does not become perpendicular to the holding axis C. Therefore, the CPU 5 can acquire the angle information of the lens LE based on the angle of the reference plane. For example, the CPU 5 may acquire the angle difference between the normal line of the reference plane and the holding axis C as the angle information.

  Next, the CPU 5 determines a third relative angle A3 in consideration of the held angle of the lens LE based on the angle information of the lens LE (S10). As an example, the CPU 5 of the present embodiment determines the temporary relative angle (second relative angle A2 in the present embodiment) when the lens LE is held at the optical center in accordance with the angle shift α of the held lens LE. To determine the third relative angle A3.

  As shown in FIG. 9, the drilling direction K by the drilling tool 440 is deviated from an appropriate angle when the temporary relative angle when the lens LE is held at the optical center is maintained. Accordingly, the CPU 5 determines the drilling direction K 'when the hole is actually formed by rotating the drilling direction K in which the angular deviation is not taken into account by the angular deviation α of the lens LE. The relative angle between the drilling direction K 'and the lens LE is a third relative angle A3.

  The CPU 5 creates the processing control data so that the relative angle between the drilling tool 440 and the lens LE when performing the drilling is A3. The CPU 5 can form a hole having an appropriate angle in the lens LE by controlling the processing operation in accordance with the generated processing control data.

  The technology disclosed in the above embodiment is merely an example. Therefore, the technology exemplified in the above embodiment can be changed. First, it is also possible to execute only a part of the processing control data creation processing (see FIG. 4) exemplified in the above embodiment. For example, the CPU 5 may determine the relative angle by considering only the tilt angle without considering the angle change of the held lens LE. In this case, the CPU 5 may omit the processing of S9 and S10 in FIG. Conversely, the CPU 5 may determine the relative angle by considering only the change in the angle of the held lens without considering the tilt angle. In this case, the CPU 5 may omit at least one of S2, S4, S5, S7, and S8 in FIG. In S10 in the present embodiment, the third relative angle A3 is determined by correcting the second relative angle A2 according to the angle shift α of the lens LE. However, when omitting the processing of S7, the CPU 5 may determine the third relative angle A3 by correcting the first relative angle A1 according to the angle shift α.

  In S6 and S7 of the above embodiment, the CPU 5 determines the first relative angle A1 based on the shape of the lens LE and the position of the hole, and corrects the first relative angle A1 based on the tilt angle to obtain the tilt angle. Is determined to determine the second relative angle A2. However, the CPU 5 may directly determine the relative angle on which the tilt angle is reflected without performing the process of determining the temporary relative angle. Similarly, in S10 of the above embodiment, the CPU 5 corrects the tentative relative angle when the lens LE is held at the optical center based on the angle information of the lens LE, thereby obtaining the angle of the held lens LE. The relative angle A3 reflecting the fluctuation is determined. However, the CPU 5 may directly determine the relative angle on which the angle fluctuation of the lens LE is reflected, without going through the process of determining the temporary relative angle.

  In the above embodiment, the CPU 5 acquires the angle information of the lens LE held by the lens holding shafts 102R and 102L, and determines the relative angle based on the angle information. However, the CPU 5 can determine the relative angle reflecting the angle fluctuation of the lens LE without acquiring the angle information of the lens LE. For example, the CPU 5 sequentially refers to the measurement results of the shape of the held lens LE until the relative angle of the drilling tool 440 of the lens LE becomes an appropriate angle, and the drilling tool 440 and the lens holding shaft 102R, You may change at least one angle of 102L. Even in this case, an appropriate relative angle is determined based on the held angle of the lens LE.

1 eyeglass lens processing device 5 CPU
200 Lens shape measurement unit 440 Drilling tool

Claims (5)

An eyeglass lens processing apparatus provided with a drilling tool for forming a hole in a lens,
Hole position obtaining means for obtaining a position of a hole formed in the lens,
Obtain the tilt angle, which is the angle of the user's visual axis and the optical axis of the lens in the vertical plane, when the user wears the spectacles with the lens attached and looks at the front. Tilt angle acquisition means,
When forming a hole at the position of the hole in the lens, a relative angle determining means for determining the relative angle between the drilling tool and the lens based on the tilt angle obtained by the tilt angle obtaining means,
An eyeglass lens processing apparatus comprising: The eyeglass lens processing apparatus according to claim 1,
The spectacle lens processing apparatus, wherein the tilt angle obtaining means obtains a specified tilt angle by an operator operating an operation unit. The eyeglass lens processing apparatus according to claim 1 or 2,
The relative angle determination means,
The shape of the lens to be processed, or the shape of the demonstration lens attached to the rimless frame, the position of the hole obtained by the hole position obtaining means, and the tilt angle obtained by the tilt angle obtaining means. An eyeglass lens processing apparatus, wherein the relative angle is determined based on the relative angle. An eyeglass lens processing apparatus according to any one of claims 1 to 3 ,
A sled that acquires a sled angle, which is an angle in a horizontal plane of a visual axis of the user and an optical axis of the lens when the user wears the spectacles to which the lens after processing is worn and looks at the front. Angle acquisition means,
Correction means for correcting the deviation of the astigmatic axis of the lens that fluctuates in accordance with the tilt angle, based on the values of the tilt angle and the warp angle;
An eyeglass lens processing apparatus , further comprising: A processing control data creating program executed by a data creating apparatus to create processing control data used in an eyeglass lens processing apparatus having a hole drilling tool for forming a hole in a lens,
By being executed by the control unit of the data creation device,
A hole position obtaining step of obtaining a position of a hole formed in the lens,
Obtain the tilt angle, which is the angle of the user's visual axis and the angle of the optical axis of the lens in the vertical plane, when the user wears the spectacles with the lens attached and looks at the front. Tilt angle acquisition step,
When forming a hole at the position of the hole in the lens, a relative angle determining step of determining a relative angle between the drilling tool and the lens based on the tilt angle obtained by the tilt angle obtaining means,
A processing control data creating program for causing the data creating apparatus to execute the processing.

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