JP2022154887A - Step formation data setting device, spectacle lens processing device and step formation data setting program - Google Patents

Abstract

To enable an operator to find that there is a portion which cannot be processed in forming a step portion of a spectacle lens, so that the operator can deal with properly.SOLUTION: A step formation data setting device 55, which sets data for forming a step portion on a rear face of a spectacle lens subjected to finish-processing, comprises: a data obtaining unit 60 that obtains data on a target step contour shape concerning the step portion; and a control unit 50 which comprises calculating means that determines whether or not a step formation processing tool can complete processing to the step contour shape, on the basis of the step contour shape and a diameter of a second processing tool unit 400 for forming the step portion, and output means that outputs a determined result by the calculating means.SELECTED DRAWING: Figure 5

Description

The present disclosure relates to a step formation data setting device for setting data for forming a step portion on the rear surface of a spectacle lens after finishing, an eyeglass lens processing device including the step formation data setting device, and a step formation data setting program.

Spectacle frames include high-curve frames that are mainly used for sunglasses and have a tight frame curve (high degree of curvature). When framing prescription lenses (e.g. negative power lenses with a thick edge) in this high curve frame, the peripheral surface on the rear side of the lens after finishing (e.g. flat processing) may interfere with the frame. There is known an eyeglass lens processing apparatus capable of processing (also referred to as step processing) to form a step portion so as to remove the corner of the peripheral edge portion of the lens (see, for example, Patent Documents 1 and 2).

Further, among spectacle frames for sunglasses, there is a lens interchangeable type in which lenses of different colors can be interchanged by the user. The rim of this lens-interchangeable spectacle frame is partially formed with a groove for fitting a part of the edge of the attached lens. Even in this lens-interchangeable spectacle frame, there is a demand for a prescription lens with a thick edge. A spectacle lens processed shape acquisition device has been proposed (see, for example, Patent Document 3).

JP 2009-131939 A JP 2015-131374 A JP 2012-185490 A

By the way, when processing a stepped portion on a spectacle lens, it may not be possible to perform processing according to the target stepped contour shape data due to restrictions on the size of the stepped processing tool. When the spectacle lens processing device finishes processing without being able to process the spectacle lens according to the target stepped contour shape, the operator only realizes that the processing of the spectacle lens is incomplete after putting the spectacle lens into the rim, and the spectacle lens is processed. necessary measures such as additional processing are not taken.

In view of the problems of the above-described conventional apparatus, the present disclosure provides step formation data settings that enable the operator to know that there are portions that cannot be processed regarding the formation of the step portion of the spectacle lens, and to take appropriate measures. A technical problem is to provide an apparatus, an eyeglass lens processing apparatus, and a step forming data setting program.

A step formation data setting device according to a first aspect of the present disclosure is a step formation data setting device for setting data for forming a step portion on a rear surface of a spectacle lens after finishing, wherein a target for the step portion is set. The step forming tool for the step contour shape based on the step contour shape and the diameter of the step forming tool for forming the step portion. and an output means for outputting the result of determination by the computing means.

An eyeglass lens processing apparatus according to a second aspect of the present disclosure includes the step formation data setting apparatus described above.

A step forming data setting program according to a third aspect of the present disclosure sets data for forming a step portion by a step forming tool for forming a step portion on a rear surface of a spectacle lens after finish processing. A step forming data setting program executed by a data setting device, comprising: a data acquisition step of acquiring data of a target step contour shape related to the step portion; and based on the step contour shape and the diameter of the step forming tool. and a control unit of the step forming data setting device to execute a computing step of determining whether or not the step forming tool can complete processing, and an output step of outputting the determination result of the computing step.

Advantageous Effects of Invention According to the present disclosure, an operator can know that there is a portion that cannot be processed regarding the formation of the stepped portion of the spectacle lens, and can take appropriate measures.

It is a figure explaining the structure of the processing mechanism part with which an eyeglass lens processing apparatus is provided. FIG. 4 is a schematic configuration diagram of a second processing tool unit; It is a figure which shows the example of a level|step difference formation processing tool. 4 is a schematic configuration diagram of a measurement unit for measuring the shape of the rear surface of the lens; FIG. FIG. 3 is a block diagram of a control system relating to the step formation data setting device and the spectacle lens processing device; FIG. 10 is a diagram showing a typical example of a spectacle frame that requires formation of a partial stepped portion; FIG. 5 is a diagram showing an example of target contour data and target step contour shape data acquired by a data acquisition unit; It is an example of a display of the edit screen of step processing. FIG. 10 is a diagram for explaining the positional relationship between the X direction and the rotational axis of the step forming tool, and the positional relationship between the lens and the step forming tool when forming a stepped portion on the lens after flat finishing. FIG. 7 is a diagram for explaining determination as to whether or not machining can be completed without causing machining interference, based on an elliptical trajectory with respect to step contour shape data. FIG. 10 is a diagram showing an example of an enlarged screen of a figure indicating an unworkable area; It is a figure explaining the calculation method of the plan processing locus|trajectory by a level|step-difference formation processing tool. FIG. 10 is a diagram showing an example in which the target lens shape data includes a hook portion read from the contour of the demo lens and a small concave portion in the vicinity thereof.

Embodiments of an eyeglass lens processing device, a step formation data setting device, and a step formation data setting program according to the present disclosure will be described with reference to FIGS. 1 to 13. FIG.

[Overview]
For example, an eyeglass lens processing apparatus (eg, eyeglass lens processing apparatus 1) according to the present disclosure includes a lens holding shaft (eg, lens chuck shaft 102). A lens holding shaft holds a spectacle lens. For example, an eyeglass lens processing apparatus includes a step forming tool (for example, step forming tool 437). The step forming tool forms a stepped portion on the rear surface of the spectacle lens after finishing. For example, the step forming tool is attached to a rotating shaft (for example, rotating shaft 431). For example, the rotation axis of the step forming tool is relatively inclined at a set angle with respect to the lens holding axis. For example, the spectacle lens processing apparatus includes a peripheral edge processing tool (for example, processing tool 168) for processing the peripheral edge of the spectacle lens. For example, the peripheral edge tool includes at least one of a roughing tool (e.g., roughing tool 166) and a finishing tool (e.g., normal finishing tool 164) that finishes the periphery of the roughed lens. Prepare. For example, the spectacle lens processing apparatus includes a large-diameter first peripheral edge processing tool (for example, the normal finishing tool 164) as a peripheral edge processing tool, and a second peripheral edge processing tool (for example, an end mill 435) smaller in diameter than the first peripheral edge processing tool. ).

For example, the spectacle lens processing apparatus includes moving means (for example, moving unit 300). The moving means is configured to adjust the relative positions of the spectacle lens held by the lens holding shaft and the processing tool (for example, the processing tool 168, the step forming tool 437, etc.). For example, the spectacle lens processing apparatus includes processing control means (for example, control unit 50). The processing control means controls the moving means.

For example, the step formation data setting device (for example, the step formation data setting device 55) is provided in the spectacle lens processing device. For example, the step formation data setting device includes data acquisition means (eg, data acquisition unit 60). For example, the data acquisition means acquires data of a target contour shape of a stepped portion to be formed on the rear surface of the spectacle lens. For example, the data acquisition means acquires the outer shape data (for example, the target lens shape data TD) of the spectacle lens.

For example, the step formation data setting device comprises a computing means (for example, the control unit 50). The calculating means determines whether or not the step contour shape can be processed according to the step contour shape data by the step forming tool, based on the step contour shape and the diameter of the step forming tool acquired by the data acquisition means. do.

For example, the computing means may form a step on the contour shape of the step based on the diameter of the step forming tool and the inclination angle (for example, the inclination angle α) of the rotating shaft to which the step forming tool is attached with respect to the lens holding shaft. It is determined whether or not processing can be completed by the processing tool. For example, the computing means obtains an elliptical trajectory drawn by the outer shape of the step forming tool when viewed from the axial direction of the lens holding shaft, and calculates the trajectory of the processing point when the elliptical trajectory touches the contour shape of the step. It may be determined whether or not it is possible to complete the processing by the step forming tool by obtaining for each corner. By calculating the machining trajectory in consideration of the inclination of the step forming tool by the calculation means, it is possible to accurately determine whether or not the machining is possible. For example, when it is determined that processing is not possible, the computing means may obtain a region where processing is not possible for the contour shape of the step based on the elliptical locus.

The angle of inclination of the rotation axis may be fixed, or may be arbitrarily changed (for example, the value of the angle LSA of the display 62 can be changed). For example, when the angle of inclination of the rotating shaft is changed, the area that can be processed by the step forming tool is also changed.

For example, when the computing means determines that processing is not possible, the locus drawn by the contour of the step forming tool when the step forming tool is positioned at a position where the step forming tool can be processed with respect to the area that cannot be processed with respect to the difference contour shape. is obtained, and the intersection of the obtained trajectory and the radial angle line changed for each radial angle of the spectacle lens is obtained, thereby obtaining the processing trajectory planned by the step forming tool. For example, the calculation means obtains an elliptical trajectory drawn by the outer shape of the step forming tool when viewed from the axial direction of the lens holding shaft as the trajectory drawn by the outer shape of the step forming tool. By obtaining this machining trajectory, the area that requires additional machining of the step portion can be made as small as possible, and the operator can efficiently carry out the additional machining.

For example, the step formation data setting device includes output means (eg, control unit 50). For example, the output means outputs the determination result by the calculation means. As a result, the operator can be notified that there is a stepped portion of the spectacle lens that cannot be processed, and the operator can take appropriate measures (required measures such as additional processing).

For example, the output means is display control means (eg, control unit 50) that controls display on a display (eg, display 62). For example, the display control means outputs the determination result by the computing means by displaying the unprocessable area obtained by the computing means in a identifiable manner on the display. For example, the display control means displays a first graphic (for example, a step contour shape graphic GTSD) indicating a target step contour shape on the screen of the display, and a processing area to be processed by the step forming tool for the step contour shape. The display on the display is controlled so that a second graphic (for example, the machining locus GPP) showing is superimposed on the first graphic.

As a result, the operator can easily visually confirm how much of the unprocessable region exists, and can easily perform additional processing on the unprocessed stepped portion, which is the unprocessable region. Note that the actual distance (for example, horizontal distance, vertical distance) may be displayed on the display in order to facilitate additional processing of the unprocessable area (unprocessed area).

Note that, for example, if the outer shape data includes a concave portion smaller than the diameter of the first peripheral edge processing tool, the processing control means determines that the diameter of the first peripheral edge processing tool is smaller than the outer shape data. A machining trajectory for outer shape machining that avoids machining interference resulting in small machining is obtained, the moving means is controlled based on the obtained machining trajectory, and a first peripheral edge machining tool is used to process the spectacle lens. The moving means is controlled based on the outer shape data of the unprocessed portion by the first processing, and the second processing is performed by processing the unprocessed portion by the second edge processing tool. By this processing, a spectacle lens after finish processing before processing by the step forming tool is obtained.

Note that the present disclosure is not limited to the apparatus described in this embodiment. For example, a control program (software) that performs the functions of the above embodiments is supplied to the system or apparatus via a network or various storage media. The program can then be read out and executed by a control unit (for example, a CPU, etc.) of the system or device.

For example, the step formation data setting program includes a data acquisition step of acquiring data of a target step contour shape for the step portion, and a step contour shape based on the acquired step contour shape and the diameter of the step forming tool The control unit of the step forming data setting device is caused to execute a calculation step of determining whether or not the step forming tool can complete processing, and an output step of outputting the result of the calculation step.

〔Example〕
One exemplary embodiment of the present disclosure will be described with reference to the drawings. FIG. 1 is a diagram for explaining the configuration of a processing mechanism provided in an eyeglass lens processing apparatus 1 according to an embodiment.

For example, the spectacle lens processing apparatus 1 includes a lens holding unit 100, which is an example of lens holding means. For example, the spectacle lens processing apparatus 1 includes a lens shape measuring unit 200 . For example, the spectacle lens processing apparatus 1 includes a first processing tool unit 150 . The first processing tool unit 150 is configured to rotate a processing tool that processes the peripheral edge of the lens LE. For example, the spectacle lens processing apparatus 1 includes a second processing tool unit 400 . The second processing tool unit 400 is configured to rotate a processing tool that forms a stepped portion on the rear surface of the lens LE after finishing. For example, the spectacle lens processing apparatus 1 includes a moving unit 300, which is an example of moving means. The moving unit 300 is configured to change (adjust) the relative positional relationship between the lens LE and the processing tools held by the first processing tool unit 150 . Further, the moving unit 300 is configured to change (adjust) the relative positional relationship between the lens LE and the processing tools held by the second processing tool unit 400 .

The lens holding unit 100 includes a lens chuck shaft 102 for holding and rotating the lens LE, and a carriage 101 . The lens chuck shaft 102 includes a pair of lens chuck shafts 102L and 102R. A lens chuck shaft 102L is rotatably held by the left arm 101L of the carriage 101, and a lens chuck shaft 102R is rotatably held by the right arm 101R of the carriage 101. FIG. Lens chuck shaft 102 is rotated by motor 120 .

The first processing tool unit 150 includes a motor 160 for rotating a processing tool rotating shaft 161 . The processing tool rotating shaft 161 is rotatably held by the body base 170 in a parallel positional relationship with the lens chuck shaft 102 . A plurality of processing tools 168 for processing the peripheral edge of the lens LE are attached to the processing tool rotating shaft 161 .

For example, the processing tools 168 include a front beveling tool 162 , a rear beveling tool 163 , a normal finishing tool 164 , a mirror finishing tool 165 and a roughing tool 166 . Although grindstones are used as the processing tools 162 to 166 in the embodiment, cutters may also be used. Roughing tool 166 is used to roughen the periphery of lens LE. The normal finishing tool 164 has a V-groove and a flat finishing surface to form a normal bevel on the low curvature lens LE. The flat finishing surface of the normal finishing tool 164 is used during flat finishing. The mirror finishing tool 165 is used to further mirror-finish the lens periphery finished by the normal finishing tool 164 . The rear beveling tool 163 is used to form a rear bevel (bevel slope on the rear side of the lens LE) on the peripheral edge of the highly curved lens LE. The front beveling tool 162 is used to form a front bevel around the periphery of the highly curved lens LE.

In this 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 the Y direction, and the direction orthogonal to the XY directions is the Z direction. and

In FIG. 1, a second processing tool unit 400 is arranged behind the carriage 101 . FIG. 2 is a schematic configuration diagram of the second processing tool unit 400. As shown in FIG. A fixed plate 401 serving as the base of the second processing tool unit 400 is fixed to a support base block 172 erected on the base 170 in FIG. A movable support base 404 is slidably attached to the fixed plate 401 along a rail 402 extending in the Z-axis direction. The movable support base 404 is moved in the Z-axis direction by rotating the ball screw 406 with the motor 405 . A rotating support base 410 is rotatably held on the moving support base 404 . The rotary support base 410 is rotated about its axis by a motor 416 via a rotation transmission mechanism.

A rotating part 430 is attached to the tip of the rotating support base 410 . A rotating shaft 431 orthogonal to the axial direction of the rotating support base 410 is rotatably held in the rotating portion 430 . The rotating shaft 431 is rotated by a motor 440 attached to the moving support base 404 via a rotation transmission mechanism arranged inside the rotating part 430 and the rotating support base 410 . An end mill 435 , which is an example of a drilling tool, is coaxially attached to one end of the rotating shaft 431 . The end mill 435 is also used as a small-diameter finishing tool for partially cutting the periphery of the lens LE after rough processing. A grooving tool 433 is coaxially attached to the rotating shaft 431 .

A step forming tool 437 is coaxially attached to the other end of the rotary shaft 431 for forming a step on the rear surface side of the lens LE after finishing. For example, the step forming tool 437 is a whetstone. The step forming tool 437 is not limited to a whetstone, and may be a cutter or the like. Since the configuration of the second processing tool unit 400 can basically use the one described in Japanese Patent Application Laid-Open No. 2003-145328, details thereof will be omitted.

FIG. 3 is a diagram showing an example of the step forming tool 437. As shown in FIG. The step forming tool 437 has a first processing surface 437a for forming a wall surface (first surface to be processed) STa on the rear surface side of the lens LE, and a base surface (second surface to be processed) extending toward the rear surface of the lens LE. and a second processing surface 437b for forming STb. The second machined surface 437b has a conical shape whose diameter decreases toward the distal end. Also, the first machined surface 437a has a conical shape whose diameter decreases toward the rear end. For example, the angle SA formed by the first processing surface 437a and the second processing surface 437b is smaller than 90 degrees and is 86 degrees. The processing surface of the step forming tool 437 may be cylindrical. For example, the step forming tool 437 has a diameter of approximately 15 mm. Of course, the diameter of the step forming tool 437 is not limited to this, and is appropriately set according to processing performance, durability, and processing accuracy during processing of the lens LE.

The moving unit 300 is configured to adjust the relative positions of the lens LE held by the lens chuck shaft 102 and the processing tool (processing tool 168, step forming tool 437, etc.). In an embodiment, mobile unit 300 comprises a first mobile unit 310 and a second mobile unit 330 .

The first moving unit 310 is used to change the inter-axis distance between the lens chuck shaft 102 and the processing tool rotating shaft 161 and rotating shaft 431 . The second moving unit 330 is used to move the lens LE in the axial direction of the lens chuck shaft 102 . Further, the moving unit 300 includes the motors 405 and 440 of the second processing tool unit 400 as third moving units.

The first moving unit 310 comprises a motor 315 . The rotation of the motor 315 causes the movable support base 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 first moving unit 310 may be configured to move the processing tool rotating shaft 161 and the rotating shaft 431 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 movable support base 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 a ball screw 337 extending in the Y direction, and the rotation of the ball screw 337 moves the carriage 101 (lens chuck shaft 102 and lens LE) in the Y direction. In the embodiment, the second moving unit 330 is configured to move the lens chuck shaft 102 in the Y direction, but may be configured to move the processing tool rotating shaft 161 and the rotating shaft 431 in the Y direction. That is, the second moving unit 330 may be configured to relatively change the inter-axis distance between the lens chuck shaft 102 and the processing tool rotating shaft 161 and rotating shaft 431 .

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

FIG. 4 is a schematic configuration diagram of the measurement unit 200F. The measurement unit 200F has a probe 206F that contacts the front surface of the lens. The probe 206F is attached to the tip of the arm 204F. The arm 204F is held by the mounting support base 201F so as to be movable in the X direction. Arm 204F is connected to motor 216F via rack 211F, pinion 212F, gear 214F, and the like. The arm 204F is moved in the X direction by driving the motor 216F, and the stylus 206F is pressed against the front surface of the lens LE. The pinion 212F is attached to the rotating shaft of the detector 213F (eg encoder). The detector 213F detects the position of the stylus 206F moved in the X direction.

The configuration of the measurement unit 200R for measuring the shape of the rear surface of the lens is bilaterally symmetrical to that of the measurement unit 200F, so description thereof will be omitted. The measurement unit 200R includes a tracing stylus 206R that contacts the rear surface of the lens, a motor 216R that moves the tracing stylus 206R in the X direction, and a detector 213R that detects the movement position of the tracing stylus 206R in the X direction.

When measuring the lens shape, the probe 206F is brought into contact with the front surface of the lens, and the probe 206R is brought into contact with the rear surface of the lens. In this state, the lens holding unit 100 rotates the lens LE, and the movement unit 300 moves the lens chuck shafts 102L and 102R in the Y direction based on the target lens shape data. The lens shape of the rear surface of the lens is measured at the same time. That is, the measuring unit 200F measures the edge position of the front surface of the lens corresponding to the target lens shape, and the measuring unit 200R measures the edge position of the rear surface of the lens corresponding to the target lens shape.

FIG. 5 is a block diagram of a control system relating to the step formation data setting device 55 and the spectacle lens processing device 1. As shown in FIG. The spectacle lens processing apparatus 1 includes a step formation data setting device 55 . The step formation data setting device 55 includes a data acquisition unit 60 . The data acquisition unit 60 may also function as a data input unit. For example, data acquisition unit 60 comprises display 62 . For example, data acquisition unit 60 comprises data input unit 63 . For example, the display 62 may have touch panel functionality and may be configured to include a data input unit 63 . A data acquisition unit 60 is connected to the contour reader 30 . For the contour reading device 30, for example, one having a function of reading the outer shape (target shape) of a demo lens (installed lens) removed from the spectacle frame and a function of reading the shape of the step portion marked on the demo lens can be used. For the details of the contour reading device 30, for example, the technology described in Japanese Patent Application Laid-Open No. 2012-185490 can be used, so this is cited.

The step formation data setting device 55 includes a control unit 50 . The control unit 50 is connected to the data acquisition unit 60 and has a function of controlling display on the display 62 . The control unit 50 has the function of arithmetic means for performing various arithmetic operations relating to the formation of the stepped portion. Further, the control unit 50 has a function of output means for outputting the calculation result. For example, the control unit 50 outputs the calculation result by controlling the display of the display 62 . The data acquisition unit 60 comprises a memory 70 which is an example of storage means. Various data acquired by the data acquisition unit 10 are stored in the memory 70 . The memory 70 also stores various programs for the control unit 50 to control the operation of the step formation data setting device 55 .

In this embodiment, the control unit 50 also serves as a control unit for the spectacle lens processing apparatus 1 and is configured to control the entire spectacle lens processing apparatus 1 . The control unit 50 is connected to electrical components (such as motors) of each unit shown in FIGS. The control unit 50 is configured to perform various calculations for lens processing.

Note that the step formation data setting device 55 may be separated from the spectacle lens processing device 1 . In this case, for example, the step formation data setting device 55 and the control unit of the spectacle lens processing device 1 are configured to be able to communicate with each other.

<Action>
The operation of the step forming data setting device 55 and the spectacle lens processing device 1 having the above configurations will be described. In the following, a case will be described in which a stepped portion is formed on the peripheral edge of the lens LE in order to fit a prescription lens to the rim of a lens-interchangeable spectacle frame.

<Acquisition of target lens shape data and step contour shape>
First, for example, an example of obtaining a target spectacle lens target lens shape (the outer shape of the lens LE) and a partial stepped contour shape by the contour reading device 30 will be described.

FIG. 6 is a diagram showing a typical example of a spectacle frame SF that requires formation of a partial stepped portion. FIG. 6(a) shows a front view of the spectacle frame SF. FIG. 6(b) shows a partial cross-sectional view of the spectacle frame SF cut at the C position. The rim of the spectacle frame SF is formed with a concave groove (hollow groove) G indicated by a dotted line. The groove G has a constant width FW. The depth of the groove G is the distance FD from the edge GC of the rim of the spectacle frame SF. A demo lens SL is fitted in a concave groove G in the spectacle frame SF. The demo lens SL has a constant thickness.

FIG. 6(c) is a diagram showing a front view of the demonstration lens SL attached to the spectacle frame SF. In order to prevent the demo lens SL from falling when it is fitted into the groove G of the rim of the spectacle frame SF, the demo lens SL is formed with hook portions SLa of projections at both left and right ends.

When acquiring the target and partial stepped contour shapes, with the demo lens SL attached to the spectacle frame SF, the operator applies a pen or clay on the lens surface of the demo lens SL along the inner boundary of the rim. etc. After the operator removes the demo lens SL from the spectacle frame SF, the contour reader 30 reads the contour and marked inner boundary of the demo lens SL. Then, as shown in FIG. 7, the target lens shape data TD (Tr, θ), which is the outer shape of the demo lens SL, and the stepped contour, which is the contour shape for forming the stepped portion on the rear surface side of the lens LE, are obtained by image processing. Shape data TSD(Sr, θ) are obtained. Tr is the radial length of the target lens TD with reference to the lens center FC, Sr is the radial length of the step contour shape TSD with reference to the lens center FC, and θ is the radial angle. In FIG. 7, the area surrounded by the target lens shape data TD and the stepped outline shape data TSD is the stepped portion.

The target contour data TD and the target step contour shape data TSD read by the contour reading device 30 are input to the data acquisition unit 10 and acquired. The target step contour shape data TSD is a two-dimensional shape like the target lens shape data TD. locus of vertex position LT between STa and base surface STb). When the data of the target lens shape TD and the step contour shape TSD are acquired, a layout setting screen for setting the layout data of the lens LE with respect to the target lens shape data TD (positional relationship data of the optical center of the lens LE with respect to the target lens shape) is displayed. 62 (not shown). For example, on the layout data setting screen, a target shape figure based on target target shape data TD is displayed. The author sets layout data by operating predetermined touch keys displayed on the layout data setting screen. For example, the layout data includes layout data such as the interpupillary distance (PD value) of the wearer, the frame center distance (FPD value) of the spectacle frame F, and the height of the optical center with respect to the geometric center of the target lens shape.

Various switches for setting processing conditions for the spectacle lens LE are displayed on the layout data setting screen. As processing conditions, it is possible to set, for example, the material of the lens, the type of frame, the processing mode (beveling mode, flat finishing mode), the presence or absence of chamfering processing, the presence or absence of step processing, and the like. When processing the step portion on the lens LE, the operator sets the flat finishing mode and the step processing mode.

When the step processing mode is set, an edit screen for step processing is displayed on the screen of the display 62 by the operator operating a predetermined touch key. FIG. 8 is a display example of an edit screen 501 for step processing.

The edit screen 501 displays, for example, a right-eye target lens shape figure GTD based on the target lens shape data TD. Also, a target step contour shape figure GTSD based on the data of the step contour shape TSD is synthesized with the target lens shape figure GTD and displayed. Further, at the lower left of the editing screen 501, a processed cross-sectional view GSB of the stepped portion of the lens LE is displayed. The operator refers to the processed cross-sectional view GSB, and determines the width of the stepped portion (the width between the front surface of the lens and the wall surface STa on the rear surface side) LSW and the angle of the base of the stepped portion (the angle with respect to the direction of the lens chuck shaft 102) LSA. , can be set by operating the touch keys. For example, the width LSW of the step portion is set by measuring the thickness of the demo lens SL. Alternatively, by measuring the width FW of the groove G of the spectacle frame SF, the width FW is set based on this width FW. Also, the angle LSA of the base surface STb with respect to the X direction is arbitrarily set by the operator. For example, the angle LSA can be set within a range of 5 degrees to 15 degrees. Note that the initial value is set to 5 degrees.

For the height information LSD of the step portion, the control unit 50 calculates the difference between the vector length Tr of the target lens shape data TD and the vector length Sr of the step contour shape data TSD for each vector angle θ. obtained by

Here, the partial rims of the lens-interchangeable spectacle frames SF are designed in various shapes. On the other hand, when forming a step portion to fit the prescription lens LE into a partial rim, it may not be possible to perform processing according to the step contour shape data TSD due to restrictions on the size of the step forming tool 437 . Therefore, based on the step contour shape data TSD and the diameter of the step forming tool 437, the control unit 50 determines whether or not the machining can be completed according to the step contour shape data TSD. In this determination, the rotation axis 431 of the step forming tool 437 is not parallel to the X direction, which is the axial direction of the lens chuck shaft 102, but is set to be inclined when processing the step portion. The angle of inclination of axis 431 must be taken into account.

FIG. 9 is a diagram for explaining the positional relationship between the X direction and the rotation axis 431 and the positional relationship between the lens LE and the step forming tool 437 when forming a stepped portion on the lens LE after flat finishing. . When processing the step portion, the lens is positioned so that the vertex CM of the first processing surface 437a and the second processing surface 437b in the step forming tool 437 coincides with the vertex position LT of the wall surface STa and the base surface STb of the step portion. The LE and the step forming tool 437 are moved relative to each other. The inclination angle α of the rotation axis 431 of the step forming tool 437 with respect to the X direction (the axial direction of the lens chuck shaft 102 ) at this time is the angle LSA of the base surface STb set on the editing screen 501 and the angle LSA of the base surface STb with respect to the rotation axis 431 . (2) the angle (the symbol is omitted) of the machining surface 437b; Then, based on the inclination angle α, as shown on the right side of FIG. 9, an elliptical trajectory EP drawn by the vertex CM (outer shape of the step forming tool 437) when viewed from the X direction is obtained (the center of the rotating shaft 431 elliptical locus relative to MO). The determination as to whether or not the machining can be completed according to the stepped contour shape data TSD is performed using an elliptical trajectory, unlike the perfect circular trajectory drawn by the processing tool 168 attached to the processing tool rotating shaft 161 parallel to the lens chuck shaft 102 . Required based on EP.

FIG. 10 is a diagram for explaining determination as to whether or not machining can be completed without causing machining interference based on the elliptical trajectory EP with respect to the step contour shape data TSD shown in FIG. In the processing apparatus 1 of FIG. 1, the elliptical trajectory EP of the step forming tool 437 touches the step contour while the lens LE rotates. It shows how the trajectory EP touches. It should be noted that the step contour shape data TSD is a range that is not processed by the step forming tool 437 in a radius vector angle range in which the target lens shape data TD is not located outside.

Srn is the radius vector length at the radius vector angle θn in the step contour shape data TSD, R is the radius of the step forming tool 437 (distance from the center of rotation to the vertex CM), and the distance between the center of the lens chuck shaft 102 and the elliptical locus EP is Assuming that the inter-axis distance from the center MO is Yn and the inclination angle of the rotating shaft 431 is α, the inter-axis distance Yn is expressed by the following equation. Note that n=1, 2, 3, . . . , N, where N is 1,000 points, for example.

ここで、θｎをある範囲で変化させ、Ｙｎが最大となる角度θｉを求める。このときの段差輪郭形状データＴＳＤ上の加工点ＰＭｉは、角度θｉ上で段差輪郭形状データＴＳＤに楕円軌跡ＥＰが接する点として求められる。図１０において、動径角θａ（中心ＭＯが位置する方向）のときに、楕円軌跡ＥＰが接する段差輪郭形状データＴＳＤ上の加工点ＰＭａは、動径角θａ上に位置している。一方、動径角θｂのときに、楕円軌跡ＥＰが接する加工点ＰＭｂは、動径角θａとは異なる角度θｂとなっている。動径角θｃのときに、楕円軌跡ＥＰが接する加工点ＰＭｃとなる。

Here, θn is changed within a certain range, and the angle θi that maximizes Yn is obtained. The processing point PMi on the step contour shape data TSD at this time is obtained as a point at which the elliptical locus EP touches the step contour shape data TSD on the angle θi. In FIG. 10, the processing point PMa on the stepped contour shape data TSD with which the elliptical trajectory EP is in contact at the radius vector angle θa (the direction in which the center MO is located) is located on the radius vector angle θa. On the other hand, when the radius vector angle is θb, the machining point PMb with which the elliptical locus EP contacts has an angle θb different from the radius vector angle θa. When the radius vector angle is θc, the machining point PMc is in contact with the elliptical locus EP.

From the processing point PMa to the processing point PMc on the stepped contour shape data TSD, the unit change angle of the radius vector angle θn is calculated for each unit change angle of the radius vector angle θn (for example, when the processing points are 1,000 points, the unit change angle of the radius vector angle θn is 0.36 degrees), the machining point changes by a very small distance.

The control unit 50 determines whether or not each machining point PMi is positioned inside the step contour shape data TSD, thereby determining whether or not machining can be performed according to the step contour shape data TSD without interference.

From the processing point PMa to the processing point PMc, the step contour shape data TSD is in a convex range, and basically in the convex range, the elliptical locus EP can be processed without interfering with the step contour shape data. .

However, in FIG. 10, the step contour shape data TSD is concave between the machining point PMc at the radius vector angle θc and the machining point PMd at the radius vector angle θd. Attempting to position each processing point PMi on the TSD interferes with the step contour shape data TSD of other portions, making processing impossible. Therefore, the area between the machining point PMc and the machining point PMd is determined as an area (range) that cannot be machined.

If the control unit 50 determines that there is an unprocessable area in the step contour shape data TSD, it outputs that fact. For example, the control unit 50 controls the display 62 to display that processing is impossible on the editing screen 501 shown in FIG. For example, in the step contour shape data TSD of FIG. A caution mark NMa is displayed on the display 62 near the radius vector angle of 180 degrees. In addition, since the unprocessable area also exists near the radius vector angle of 0 degrees, the control unit 50 causes the display 62 to display the caution mark NMa also near the radius vector angle of 0 degrees. This allows the operator to recognize that there is an unprocessable region in the step contour shape data TSD and that the step forming tool 437 cannot complete processing.

Further, when the operator touches the caution mark NMa, an enlarged screen 520 of a figure showing the unprocessable area pops up on the edit screen 501 as shown in FIG. 11 so that the unprocessable area can be identified. is displayed. On the enlarged screen 520 of FIG. 11( a ), a figure of the machining locus GPP that is actually scheduled to be machined by the step forming tool 437 is displayed. The machining trajectory GPP is displayed superimposed on the step contour shape figure GTSD. An area GNA between the machining locus GPP and the stepped contour figure GTSD is indicated as an unmachinable area (unprocessed area). The unprocessable area GNA is displayed so as to be distinguished from the processable area GSD by the step forming tool 437 . For example, region GNA is displayed in a different color relative to region GSD. Such a display allows the operator to visually identify the area that cannot be processed by the step forming tool 437 . Also, the actual distance in the vertical direction (y direction) in the unprocessable area GNA is displayed in a display field 521, and the actual maximum distance in the horizontal direction (x direction) is displayed in a display field 522. By displaying these distances, the operator can recognize the range of the additional processing of the lens LE, and can perform the additional processing more easily.

The enlarged screen 520 in FIG. 11B is a diagram showing another display example for making the unprocessable area identifiable. In the enlarged screen 520 of FIG. 11(b), the area that cannot be processed is displayed as a curved figure GNL. The area from the start point to the end point of the curved graphic GNL is shown as an unworkable area. Such a display also enables the operator to visually identify the areas that cannot be processed by the step forming tool 437 .

Here, a calculation method for obtaining the machining locus GPP in the machining-impossible area will be described. The portion between the machining point PMc and the machining point PMd in FIG. 10 is machined by the vertex CM of the step forming tool 437 of the elliptical trajectory EP. For this reason, the machining point for each unit angle between the machining point PMc and the machining point PMd cannot be obtained based on the formula (1) described above. Therefore, the control unit 50 obtains the machining locus GPP in the machining-impossible area as follows.

12A and 12B are diagrams for explaining a method of calculating the planned machining locus GPP by the step forming tool 437. FIG. In FIG. 12, in order to simplify the explanation, the center MO of the elliptical trajectory EP is positioned in the x-axis direction (the direction of the radial angle of 0 degrees) in the xy coordinates with the center FC of the target lens shape as the origin. described as a thing. For example, the machining trajectory GPP is obtained for each radius vector angle of unit change angle (0.36 degrees in the embodiment) around the center FC. Note that the xy directions in FIG. 12 are directions for convenience of explanation, and are different from the XY directions shown in FIG.

図１２において、楕円軌跡ＥＰ上の座標は、以下の数３の式で表される。

Ｄは中心ＦＣから楕円軌跡ＥＰの中心ＭＯまでのｘ方向の距離を示し、Ｒは段差形成加工具４３７の半径を示す（図９参照）。αはレンズチャック軸１０２の軸方向に対する段差形成加工具４３７の傾斜角を示す（図９参照）。 In FIG. 12, a radius vector angle line LLP of a given radius vector angle θi (i=1, 2, 3, . . . , N) is represented by Equation 2 below.

In FIG. 12, the coordinates on the elliptical trajectory EP are represented by Equation 3 below.

D indicates the distance in the x direction from the center FC to the center MO of the elliptical locus EP, and R indicates the radius of the step forming tool 437 (see FIG. 9). α represents the inclination angle of the step forming tool 437 with respect to the axial direction of the lens chuck shaft 102 (see FIG. 9).

By solving the simultaneous equations of Equations 2 and 3 above, the xy coordinates of the point of intersection between the radial angle line LLP and the elliptical locus EP are obtained. Although two points of intersection are obtained, the point of intersection closer to the center FC is adopted as the calculation result. Then, the coordinates on the elliptical trajectory EP shown in FIG. 12 are obtained by changing the radius vector angle θi for each unit change angle and determining the intersection point of each radius vector angle θi.

In FIG. 10, the elliptical locus EP has a radius vector angle θc that contacts the step contour data TSD with the processing point PMc, and a radius vector angle θd that contacts the step contour shape data TSD with the processing point PMd. , the coordinates on each elliptical locus EP are obtained. Then, in the portion where the elliptical loci EP overlap, the coordinates closer to the center FC are adopted. As a result, the machining locus GPP expected in the machining-impossible area (the area between the machining point PMc and the machining point PMd) is obtained.

By obtaining the machining locus GPP as described above and displaying it on the screen of the display 62, the difference from the non-machining area GNA becomes visually clear. Makes it easier to understand the area.

After confirming the setting of data necessary for forming the stepped portion and the unprocessable area on the edit screen 501, the operator clamps the lens LE between the lens chuck shafts 102R and 102L. When the operator presses a processing start switch (not shown), the step processing data set by the step forming data setting device 55 is output to the control unit 50 which is an example of the control unit of the spectacle lens processing apparatus 1 . The control unit 50 starts an operation for processing the peripheral edge of the lens LE.

First, the control unit 50 operates the lens shape measurement unit 200 to perform lens shape measurement. The control unit 50 acquires X-direction position information corresponding to the target lens shape on the front and rear refractive surfaces of the lens LE. At this time, the control section unit 50 acquires curve information (inclination information) of the refractive surfaces (front refractive surface and rear refractive surface) of the lens LE from the data obtained by the lens shape measurement unit 200 . For example, the front refractive surface curve information can be obtained mathematically by using at least four points of the front refractive surface data corresponding to the lens shape. The curve information of the front refracting surface may be acquired by acquiring position information at different distances from the center of the lens chuck for each radius vector angle in the vicinity of the position corresponding to the target lens shape.

When the lens shape measurement is completed, the control unit 50 starts roughing. Based on the target lens shape data TD and the layout data, the control section unit 50 obtains processing control data for driving each member in order to roughly process the lens periphery. The rough processing control data is based on the diameter (radius) of the rough processing tool 166 and the lens shape data TD, and the axis between the processing tool rotating shaft 161 and the lens chuck shaft 102 (the rotation center of the lens LE) for each rotation angle of the lens LE. It is obtained by finding the inter-distance. The rough machining control data is acquired as data obtained by increasing the inter-axis distance between the grindstone rotating shaft 161 and the lens chuck shaft 102 during finish machining by a constant rough machining margin.

When the roughing control data is acquired, the control unit 50 drives the motor 315 to move the carriage 101 so that the lens LE comes to the position of the roughing grindstone 166. After that, the motor 150 is driven based on the roughing control data. is controlled to perform rough processing on the peripheral edge of the lens LE.

After roughing is completed, flattening (flat finishing) is then performed. Based on the target lens shape data TD and the layout data, the control unit 50 obtains flattening control data for flattening the lens peripheral edge. The flat processing control data is obtained by obtaining the inter-axis distance between the processing tool rotating shaft 161 and the lens chuck shaft 102 for each rotation angle of the lens LE based on the diameter of the flat finishing surface of the finishing tool 164 and the lens shape data TD. obtained by

Here, as shown in FIG. 13, the target lens shape data TD includes the hook portion SLa read from the contour of the demo lens SL, so there is a small concave portion SLb in the vicinity of the hook portion SLa. If the diameter of the finishing tool 164 is larger than that of the concave portion SLb, it cannot be processed according to the lens shape data of the concave portion SLb. Therefore, based on the diameter of the finishing tool 164, the control unit 50 obtains a corrected locus TDLb that can be processed by the finishing tool 164. FIG. Since the processing tool rotation axis 161 of the finishing tool 164 is parallel to the lens chuck axis 102, the control unit 50 considers the inclination of the rotation axis 431 as in the case of the step forming tool 437. It is not necessary, and by finding the machining points assuming that the finishing tool 164 is a perfect circle, it is possible to find the correction locus TDLb for outer shape machining that avoids machining interference that causes machining to be smaller than the target lens shape data TD. Note that in FIG. 13, the correction locus TDLb is set at two locations, the left portion and the right portion. An unmachined area by the finishing tool 164 is set as an area to be machined by an end mill 435 having a diameter smaller than that of the finishing tool 164 .

The control unit 50 controls driving of the moving unit 300 based on the target lens shape data TD and the correction locus TDLb, and finishes the peripheral edge of the lens LE with the finishing tool 164 . Next, the control unit 50 controls the driving of the first moving unit 310 , controls the driving of the motors 405 and 416 of the second processing tool unit 400 , and cuts the unprocessed area by the finishing tool 164 by the end mill 435 . be processed. This completes the finishing process.

After finishing the lens LE, the control unit 50 uses the step forming tool 437 to form a step on the peripheral edge of the lens LE after finishing. The control unit 50 controls the step formation control data in the Y direction (control data for the distance between the center of the lens chuck shaft 102 and the center MO of the step forming tool 437) based on the step contour shape data TSD as described above. is obtained by finding the machining point for each radius vector angle. At this time, the control unit 50 sets the inclination of the rotation shaft 431 of the step forming tool 437 based on the angle LSA set on the edit screen 501 . In addition, the control unit 50 sets the X-direction position corresponding to the step contour shape data TSD for each radius vector angle with respect to the step formation control data in the X-axis direction using the front refraction surface shape of the lens LE and the edit screen 501. and the width LSW of the stepped portion. The shape of the front refractive surface of the lens LE is obtained based on the measurement result by the lens shape measuring unit 200. FIG.

The control unit 50 controls the driving of each motor of the moving unit 300 and the second processing tool unit 400 based on the Y-direction and X-direction control data, and as shown in FIG. By rotating the lens LE while aligning the vertex CM of 437 with the vertex position LT of the lens LE, a stepped portion is formed in the lens LE. At this time, the control unit 50 completes the machining leaving a non-machining area (area GNA in FIG. 11A) so that the machining point of the vertex CM does not enter the center side of the step contour shape data TSD.

After completing the processing of the lens LE by the spectacle lens processing apparatus 1 , the operator removes the lens LE from the lens chuck shaft 102 . The operator uses a device (for example, a hand grinder for engraving) other than the spectacle lens processing device 1 to additionally process the unprocessed region of the step portion. For example, for additional processing, the operator operates the display 62 of the spectacle lens processing apparatus 1 to display the enlarged screen 520 shown in FIG. 11(a). The operator can refer to the unprocessable area GNA displayed on the enlarged screen 520, the vertical distance displayed in the display column 521, the horizontal distance displayed in the display column 522, and the like, thereby making it possible to It becomes easier to perform additional machining of the machining area.

<transformation example>
In the above description, an example in which the step forming tool 437 is used as a tool for forming a step portion (step) has been described, but the present invention is not limited to this. For example, the grooving tool 433 may also be used as the step forming tool. When the grooving tool 433 is used as the step forming tool, the rotation axis 431 is tilted with respect to the lens chuck shaft 102, so that the trajectory drawn by the vertex of the grooving tool 433 is an ellipse. becomes a trajectory. Therefore, whether or not the machining can be completed according to the step contour shape data TSD is determined based on the elliptical trajectory, similarly to the step forming tool 437 .

In this embodiment, the inclination angle α of the rotating shaft 431 of the step forming tool 437 with respect to the axial direction of the lens chuck shaft 102 is set by rotating the rotating part 430 of the second tool unit 400. However, it is not limited to this. For example, the tilt angle α of the rotating shaft 431 may be set by placing the rotating shaft 431 at the processing position by another rotating mechanism and indirectly setting the angle of rotation.

In the above description, the case where flat finishing (flat processing) is performed as finishing processing has been described as an example, but the present invention is not limited to this. For example, as finishing, beveling may be performed using a V-groove of the finishing tool 164 . Further, as the finishing process, grooving and chamfering by the grooving tool 433 may be further performed on the peripheral edge after the flat finishing process.

Although typical embodiments of the present disclosure have been described above, the present disclosure is not limited to the embodiments shown here, and various modifications are possible within the scope of keeping the same technical idea of the present disclosure.

Reference Signs List 1 spectacle lens processing device 50 control unit 55 step forming data setting device 60 data acquisition unit 62 display 102 lens chuck shaft 431 rotating shaft 437 step forming tool

Claims (7)

A step formation data setting device for setting data for forming a step portion on the rear surface of a spectacle lens after finishing,
data acquisition means for acquiring data of a target contour shape of the stepped portion;
computing means for determining whether or not the step contour shape can be completed by the step forming tool for forming the step portion, based on the step contour shape and the diameter of the step forming tool for forming the step portion; ,
an output means for outputting the determination result by the calculation means;
A step formation data setting device comprising: In the step formation data setting device according to claim 1,
The calculating means calculates the step contour shape based on the diameter of the step forming tool and the inclination angle of the rotating shaft to which the step forming tool is attached with respect to the lens holding shaft that holds the spectacle lens. A step forming data setting device, characterized in that it is determined whether or not it is possible to complete machining by the step forming tool rotated on a rotation axis with an inclination angle. In the step formation data setting device according to claim 2,
The output means is display control means for controlling display on a display,
The step formation data setting device, wherein the display control means outputs the determination result by the calculation means by displaying the unprocessable area of the step contour shape on the display in a identifiable manner. In the step formation data setting device according to claim 3,
The display control means displays, on the screen of the display, a first figure indicating the contour of the step, and displays a second figure indicating a processing area to be processed by the tool for forming the step with respect to the contour of the step. A step formation data setting device, characterized in that by superimposing and displaying a figure, a non-machineable region for the step contour shape can be identified. In the step formation data setting device according to any one of claims 1 to 4,
When it is determined that processing is not possible, the computing means determines that when the step forming tool is positioned at a position where processing is possible with respect to the step contour shape, the outer shape of the step forming tool is A trajectory to be drawn is obtained, and an intersection of the obtained trajectory and a radial angle line changed for each radial angle of the spectacle lens is obtained, thereby obtaining a processing trajectory planned by the step forming tool. step forming data setting device. A spectacle lens processing device for processing a peripheral edge of a spectacle lens,
An eyeglass lens processing apparatus comprising the step formation data setting apparatus according to any one of claims 1 to 5. A step forming data setting program executed by a step forming data setting device for setting data for forming a step portion by a step forming tool for forming a step portion on a rear surface of a spectacle lens after finish processing, the program comprising: ,
a data acquisition step of acquiring data of a target step contour shape for the step portion;
a computing step of determining whether or not processing can be completed by the step forming tool based on the step contour shape and the diameter of the step forming tool;
an output step of outputting the determination result of the calculation step;
is executed by the control unit of the step forming data setting device.

Images