JP4824320B2 - Method and apparatus for chamfering spectacle lens - Google Patents

Description

  The present invention relates to a chamfering method and a chamfering apparatus for a spectacle lens for further chamfering a spectacle lens after processing on which a bevel consisting of a bevel crest or a bevel hem formed on the periphery thereof is formed. .

In a conventional spectacle lens chamfering device, when chamfering the edge surface of a spectacle lens after normal beveling, even if the edge thickness is a narrow edge position or a thick edge position, The chamfering width can be changed to perform chamfering (see, for example, Patent Documents 1 to 3).
JP 2004-314256 A Japanese Patent Laid-Open No. 2005-1002 JP 2002-126985 A

  However, in the conventional spectacle lens chamfering device, the bevel hem portion is extremely narrow and the chamfer width cannot be sufficiently obtained in the spectacle lens after beveling, or the edge thickness is extremely narrow and only the bevel peak portion is formed. Chamfering in such a case is not clearly described, and an operator engaged in eyeglass processing cannot automatically perform chamfering, and there is no method other than manual chamfering.

  In addition, among the edge of the spectacle lens generally framed in the spectacle frame, the edge portion of the spectacle wearer's eyebrow is narrowed, and as a result, the bevel hem of the bevel ridge formed at the periphery of the spectacle lens is narrowed. Therefore, the chamfer width may be uneven. However, even for the edge portion where the edge thickness of the eyeglass lens is thin or the bevel skirt is narrower than usual, the eyeglass wearer has been demanded to have eyeglasses chamfered with a certain chamfer width.

  Therefore, in the present invention, since the edge of the spectacle lens is narrow, even in the edge portion of the spectacle lens where the bevel hem is extremely narrow or the bevel hem is hardly formed, the chamfer width is constant. It is an object of the present invention to provide a chamfering method and a chamfering apparatus for a spectacle lens that can be chamfered.

To solve the above problems, the invention of claim 1, to form a bevel crest bevel skirt and bevel apex is provided on the edge end is edge surface of the eyeglass lens, the bevel in the edge end The width from the position of the apex to the hem end of the bevel hem is the bevel shoulder width, and the width from the position of the bevel apex at the end of the edge to the refractive surface of the spectacle lens is the edge width , in chamfering method of the spectacle lens chamfering by the chamfering grindstone a corner of the edge end of the peripheral, the default of the chamfer width of the cutting surface of the chamfered by the chamfering is M, the actual chamfer The chamfer cutting width of machining is M ′ and the cutting width is M ′.
M ′ = worker setting small chamfering width + [M−width of chamfering standard]
So that you can ask
The chamfer width of the chamfer formed at the corner of the edge by the chamfering is larger than the width obtained by subtracting the bevel shoulder width from the edge width, and a value obtained by adding the bevel shoulder width to the chamfer width is wherein when less than the edge width, over the bevel skirt and chamfered to and said surface preparative process until bevel inclined surface of the bevel ridges on the corner portion by the chamfering abrasive wheel the entire circumference of the spectacle lens It is based on the cutting width M ′ .

According to a second aspect of the present invention, there is provided an edge thickness measuring means for measuring an edge thickness of the spectacle lens based on lens shape information (θi, ρi) of the spectacle lens read by the target lens shape measuring device, and a bevel skirt. And a lens rotation shaft for sandwiching the spectacle lens after beveling formed with a bevel crest having a bevel apex at the edge of the peripheral edge, and first driving means for rotationally driving the lens rotation shaft; A chamfering grindstone for chamfering the edge of the eyeglass lens after beveling, a second driving means for rotationally driving the chamfering grindstone, and the lens rotating shaft and the chamfering grindstone relatively close to each other. Third drive means for driving away, calculation control means for driving and controlling the first to third drive means, and a width from the position of the bevel apex at the edge of the edge to the hem end of the bevel hem. The beveled mountain A chamfering device for spectacle lenses provided with data input means for inputting the bevel shoulder width data when the bevel shoulder width of the bottom hem is provided, and the default chamfering of the chamfered cut surface by the chamfering process. When the width is M and the actual chamfering chamfering width is M ′, the cutting width is M ′.
M ′ = worker setting small chamfering width + [M−width of chamfering standard]
In addition, the width from the position of the bevel apex at the edge of the edge to the refractive surface of the spectacle lens is defined as the edge width, and the width of the chamfer formed at the corner of the edge by the chamfering is chamfered. When the width
It said arithmetic control unit, the chamfer width, said bevel shoulder, from the edge width, it is determined whether the chamfer to bevel inclined surface of the bevel skirt or bevel skirt and bevel crest, the chamfer The chamfer width of the chamfer formed at the corner of the edge of the edge by processing is larger than the width obtained by subtracting the bevel shoulder width from the edge width, and the value obtained by adding the bevel shoulder width to the chamfer width is the edge width. If smaller, the prior SL first to third drive means controlled and driven, the is chamfered to bevel inclined surface of the bevel skirt and bevel mountain portion to the corner portion by the chamfering abrasive wheel said surface The machining is performed based on the cutting width M ′ over the entire circumference of the spectacle lens.

  As described above, according to the present invention, since the edge of the spectacle lens is narrow, the width of the bevel hem also in the edge of the spectacle lens in which the bevel hem is extremely narrow or the bevel hem is hardly formed. Accordingly, the apparatus can automatically determine and perform chamfering with a certain chamfering width, and chamfering can be performed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Constitution]
In FIG. 1, reference numeral 1 denotes a frame shape measuring device (lens shape measuring device) for reading lens shape information (θi, ρi) as lens shape data from a lens frame shape of an eyeglass frame F, its template or a template model. Reference numeral 2 denotes a lens grinding device (ball grinder) that grinds the spectacle lens based on the lens shape data of the spectacle frame input from the frame shape measuring device 1 by transmission or the like. In addition, since a well-known thing can be used for the frame shape measuring apparatus 1, description of the detailed structure, a data measurement method, etc. is abbreviate | omitted.

<Lens grinding device 2>
As shown in FIG. 1, the lens grinding apparatus 2 includes a processing chamber 4 provided near the front surface of the apparatus main body 3 and a cover 5 that opens and closes the processing chamber 4. Further, as shown in FIG. 2, main processing parts are arranged in the processing chamber 4. In addition, a carriage (not shown) that holds a part of the main processing parts and a driving system (such as a motor) for the main processing parts and carriage are disposed outside the processing chamber 4. The carriage has a U-shape in plan view from a pair of left and right arm portions extending in the front-rear direction and a continuous portion connecting the rear end portions of the arm portions. Further, the carriage is provided with an arm portion that can move left and right and that can move up and down around the rear edge of the continuous portion.

  In FIG. 2, 4a and 4b are side walls of the processing chamber 4, and 4c and 4c are arc-shaped slits formed in the side walls 4a and 4b. A pair of arm portions of the carriage are disposed outside the side walls 4a and 4b. Since the carriage having such an arm portion can adopt a known configuration, detailed description and illustration thereof will be omitted.

  Further, the lens grinding apparatus 2 displays the first and second operation panels 6 and 7 used when performing the control operation and data setting operation of the drive system, the operation state by the operation panels 6 and 7 and the like. And a liquid crystal display 8 as a display device (display means).

(Machining main parts)
As shown in FIG. 2, the main parts for processing disposed in the above-described processing chamber 4 include a pair of left and right lens rotation shafts 9 and 10 that extend to the left and right of the apparatus body 3 and pass through the slits 4c and 4c. . The slits 4c and 4c are closed by a cover (not shown) that moves integrally with the lens rotation shafts 9 and 10.

  The lens rotation shafts 9 and 10 are arranged in series with each other and have the same axis, and are rotatably held by the arm portions of the pair of carriages described above. The lens rotation shaft 10 is provided so as to be able to advance and retract with respect to the lens rotation shaft 9. Then, the spectacle lens ML is disposed between the lens rotation shafts 9 and 10 and the lens rotation shaft 10 is advanced to the lens rotation shaft 9 side, whereby the spectacle lens ML is held (clamped) between the lens rotation shafts 9 and 10. it can. Further, by operating in the opposite direction, the spectacle lens ML can be removed from between the lens rotation shafts 9 and 10.

  As main parts for processing, a grinding wheel 11 for grinding the spectacle lens ML, a grindstone shaft 12 for rotating the grinding wheel 11, and a chamfering grindstone 13 for chamfering the peripheral portion of the spectacle lens ML. , 14 and a groove cutter (groove grindstone) 17 for grooving the edge surface of the spectacle lens ML.

  Furthermore, as main parts for processing, chamfering grindstones 13 and 14, a chamfering shaft (grooving shaft) 15 for rotating a grooving cutter (grooving grindstone) 17, and a turning for driving and turning the chamfering shaft 15. There is an arm 16, a grooving cutter 17 provided on the chamfering shaft 15 adjacent to the chamfering grindstone 14, and an arcuate cover 18 that covers the chamfering grindstones 13, 14 and the grooving cutter 17.

  Further, as the lens rotation shafts 9 and 10, hoses (not shown) that are provided inside the arc-shaped cover 18 and apply grinding water to the grinding wheel surface of the grinding wheel 12, the chamfering grinding stones 13 and 14 or the groove cutter 17. And edge thickness measuring member 19 for measuring the edge thickness Wi of the spectacle lens ML.

  The cover 5 is formed of a single glass or resin panel that is colorless and transparent or colored and transparent (for example, translucent such as a bag), and slides forward and backward of the apparatus body 3.

  The processing chamber 4 is provided with a rounded inclined surface 4d that is positioned behind the spectacle lens ML and has a structure in which grinding waste can be easily flowed.

(Drive system for main parts for machining)
As a drive system for the main parts for processing, the above-described carriage (not shown), vertical movement means (not shown in FIG. 2) for rotating the carriage up and down using a drive motor such as a pulse motor, A drive motor (not shown in FIG. 2) such as a pulse motor that moves left and right, a drive motor (not shown in FIG. 2) such as a pulse motor that rotates the lens rotation shafts 9 and 10, and a vertical rotation of the carriage Accordingly, a drive motor (not shown in FIG. 2) for rotating the grinding wheel 11 when the spectacle lens ML held between the lens rotation shafts 9 and 10 is ground is provided.

  Since a well-known configuration can be adopted for the drive motor and the structure for driving the carriage of such a drive system, detailed description thereof is omitted. Further, the grinding wheel 11 includes a rough grinding wheel, a bevel wheel, a finishing wheel, and the like.

  The drive system described above drives the lens rotation shafts 9 and 10 for each angle θi (i = 0, 1, 2, 3,..., N) based on the lens shape information (θi, ρi). And a carriage (not shown) is turned up and down by a drive motor (not shown) to grind the rough grinding wheel 11a of the grinding wheel 11 that rotates the periphery of the spectacle lens ML. At this time, the drive system rotates the front end of the carriage up and down at each angle θi so that the distance between the lens rotation shafts 9 and 10 and the grindstone rotation shaft 12 becomes the grindstone radius + the moving radius ρi at every angle θi. The lens rotation shafts 9 and 10 and the spectacle lens ML are moved up and down. As a result, the spectacle lens ML is roughly ground into lens shape information (θi, ρi) by the grinding wheel 11.

Similarly to the above, the drive system controls the operation of each drive motor based on the lens shape information (θi, ρi), and the peripheral edge of the spectacle lens ML roughly ground into the lens shapes (lens shapes) LL and LR. The edge of the edge can be beveled by the bevel wheel 11b of the grinding wheel 11. At this time, the driving system controls the driving motor that drives the carriage to the left and right based on the preset bevel position data, thereby performing beveling on the edge of the eyeglass lens ML that has been roughly processed into a lens shape. It is like that. In addition, since the grinding process of such spectacle lens ML can employ | adopt a known structure, detailed description is abbreviate | omitted.
(Edge thickness measuring device)
The edge thickness measuring device (edge thickness measuring means) has an edge thickness measuring member 19. The edge thickness measuring member 19 includes a pair of feelers 19a and 19b facing each other in a separated state. The feelers 19a and 19b are integrally provided on a measurement shaft 19c extending in the right direction of operation. The measurement shaft 19c penetrates the side wall 4b of the processing chamber 4 to the left and right and is movable to the left and right. Further, the measuring shaft 19c is held by a spring (not shown) so that the feelers 19a and 19b are located at the approximate center of the rear edge of the processing chamber 4. Accordingly, the feelers 19a and 19b and the measurement shaft 19c are returned to the approximate center of the rear edge of the processing chamber 4 when the moving force in the left-right direction is released.

  Moreover, the edge thickness measuring device (edge thickness measuring means) detects and measures the movement positions (or movement amounts) of the feelers 19a, 19b in the left-right direction in conjunction with the measurement shaft 19c (not shown). Have This measurement unit is provided outside the measurement chamber 4.

  More specifically, the movement positions or movement amounts of the feelers 19a, 19b and the measurement shaft 19c in the left-right direction are read sensors (position detection means or movement amount detection means) (not shown) built in a measurement unit (not shown). Is read.

  Further, the edge thickness measuring device (edge thickness measuring means) includes a driving means such as a pulse motor (not shown) that rotates the measuring shaft 19c about the axis. This driving means is rotated between a position (standby state) where the measuring shaft 19c is rotated and the feelers 19a, 19b are flipped up about 90 degrees (standby state) and a use position (used state) which is tilted horizontally to the front side. ing. This rotation is performed by a control circuit described later.

  When measuring the edge thickness Wi of the spectacle lens ML based on the lens shape information (θi, ρi), the spectacle lens ML is held by the lens rotation shafts 9 and 10 and the feelers 19a and 19b are horizontally tilted forward. To.

  In this state, the lens rotation shafts 9 and 10 are moved up and down and left and right integrally with the carriage by a drive motor, thereby bringing the tip of the feeler 19a into contact with the front refractive surface of the spectacle lens ML or the tip of the feeler 19b. It can be brought into contact with the rear refractive surface.

  Further, the lens rotation shafts 9 and 10 are rotated for each angle θi based on the lens shape information (θi, ρi) while the tip of the feeler 19a is in contact with the front refractive surface of the spectacle lens ML. By moving the carriage up and down so that the inter-axis distance between the rotary shafts 9 and 10 and the grinding wheel 11 (or the grinding wheel rotary shaft 12) becomes Xi (radius of the grinding wheel 11 + radius ρi) for each angle θi. The tip of the feeler 19a can be moved in contact with the moving radius ρi of the front refractive surface of the spectacle lens ML. Similarly, with the tip of the feeler 19b in contact with the rear refractive surface of the spectacle lens ML, the lens rotation shafts 9 and 10 are rotated for each angle θi based on the lens shape information (θi, ρi). The carriage is moved up and down so that the inter-axis distance between the lens rotation shafts 9 and 10 and the grinding wheel 11 (or the grinding wheel rotation shaft 12) becomes Xi (radius of the grinding wheel 11 + radius ρi) for each angle θi. Thus, the tip of the feeler 19b can be moved in contact with the moving radius ρi of the front refractive surface of the spectacle lens ML. When the lens rotation shafts 9 and 10 are rotated based on the lens shape information (θi, ρi) while the feelers 19a and 19b are in contact with the spectacle lens ML, the feelers 19a and 19b are refracted surfaces of the spectacle lens ML. It is moved in the left-right direction according to the curve of.

  Therefore, in order to obtain the edge thickness Wi of the spectacle lens ML, the left-right direction of the front refractive surface of the spectacle lens ML in the lens shape information (θi, ρi) using the feeler 19a (optical axis direction = lens rotation axis 9, 10 The amount of movement (the amount of movement of the feeler 19a in the left-right direction) in the direction in which the axis extends is obtained by a reading sensor (not shown) of the measuring unit. Next, using the feeler 19b, the movement amount (the feeler 19b) of the front refractive surface of the spectacle lens ML in the lens shape information (θi, ρi) in the left-right direction (the optical axis direction = the direction in which the axis of the lens rotation axis 9, 10 extends). Is determined by a reading sensor (not shown) of the measuring unit.

  Here, when the feelers 19a and 19b are in the initial position, the distance from the center position between the feelers 19a and 19b to the tip of the feeler 19a is xa, and the distance from the center position between the feelers 19a and 19b to the tip of the feeler 19b. The distance is -xa, the left and right movements from the initial position of the feeler 19a are fa and -fa, respectively, and the left and right movements from the initial position of the feeler 19b are fb and- Let fb. Under this condition, the lateral movement position Fa of the tip of the feeler 19a from the center position between the feelers 19a and 19b is xa + fa or xa-fa, and from the center position between the feelers 19a and 19b to the left and right direction of the tip of the feeler 19b. The moving position Fb is −xa + fb or −xa−fb.

  Accordingly, by subtracting xa from such a movement position Fa, the movement amount fa of the feeler 19a is obtained as a movement position Fa 'in the left-right direction from the center position between the feelers 19a and 19b, and xa is subtracted from the movement position Fb. Thus, the movement amount fb of the feeler 19b is obtained as the movement position Fb ′ in the left-right direction from the center position between the feelers 19a, 19b. Then, by obtaining the difference between the obtained movement positions Fa ′ and Fb ′, the edge thickness Wi can be obtained from the lens shape information (θi, ρi) of the spectacle lens ML.

(Operation panel 6)
As shown in FIG. 3A, the operation panel 6 includes a “clamp” switch 6a for clamping the spectacle lens by the lens rotation shafts 9 and 10 and designation of processing for the right eye and the left eye of the spectacle lens. "Left" switch 6b for switching display and "right" switch 6c, "grinding wheel movement" switches 6d and 6e for moving the grindstone in the left-right direction, and when the finishing process of the spectacle lens is insufficient A “refinish / trial” switch 6f for refinishing or trial sliding when sliding, a “lens rotation” switch 6g for lens rotation mode, and a “stop” switch 6h for stop mode are provided. .

(Operation panel 7)
As shown in FIG. 3B, the operation panel 7 includes a “screen” switch 7a for switching the display state of the liquid crystal display 8, and a “memory” switch for storing settings relating to processing displayed on the liquid crystal display 8. 7b, a “data request” switch 7c for capturing lens shape information (θi, ρi), and a seesaw type “− +” switch 7d (“−” switch and “+” switch used for numerical correction) And a “７” switch 7e for moving the cursor-type pointer is arranged on the side of the liquid crystal display 8. In addition, function keys F1 to F6 are arranged below the liquid crystal display 8.

  The function keys F1 to F6 are used at the time of setting related to the processing of the spectacle lens, and are also used for response / selection to a message displayed on the liquid crystal display 8 in the processing step.

(Liquid crystal display 8)
On the upper part of the liquid crystal display 8, a “layout” tab TB1, a “processing” tab TB2, a “processed” tab TB3, and a “menu” tab TB4 are displayed. The display on the liquid crystal display 8 can be switched by selecting the “layout” tab TB1, the “processing” tab TB2, the “processed” tab TB3, and the “menu” tab TB4.

  In addition, function indicators H1 to H6 corresponding to the function keys F1 to F6 are provided at the lower edge of the liquid crystal display 8. The function display portions H1 to H6 are appropriately displayed as necessary. Further, when the function display portions H1 to H6 are in the non-display state, a pattern, a numerical value, or a state different from that corresponding to the function keys F1 to F6 is displayed on the lower edge portion of the liquid crystal display 8. be able to.

  When the “Layout” tab TB1, the “Processing” tab TB2, and the “Processed” tab TB3 are selected, they are divided into an icon display area E1, a message display area E2, a numerical value display area E3, and a status display area E4. Is displayed. Further, when the “menu” tab TB4 is selected, it may be displayed as a single menu display area as a whole or as a unique section display area.

  The icon displayed in the icon display area E1 is formed on the edge surface of the eyeglass lens when the eyeglass lens edge thickness is measured based on the lens shape information (θi, ρi) which is the lens shape data. A state in which the bevel shape is simulated, a state where the edge of the edge is roughly processed, a state where the edge of the edge is finished, a state where the edge of the edge is mirror-finished, a state where the edge of the edge is grooved, a surface where the edge of the edge is grooved and chamfered State to be machined, groove end chamfering, chamfering, mirror finishing, edge cutting, beveling, edge cutting, beveling, chamfering, edge cutting, beveling, chamfering, mirroring, The eyeglass lenses are arranged side by side corresponding to each work such as the end of the grinding process of the spectacle lens.

  In addition, above each icon, a plurality of cursor indicators that correspond one-on-one and are lit and displayed in accordance with the progress of the series of work so that the operator can identify the progress of the series of work, The right eye lens progress status display and the left eye lens progress status display are provided in the “under processing” tab TB2 in two upper and lower stages.

  In the message display area E2, various error messages and warning messages are displayed according to the state. In the case of a warning message or the like when there is a risk of damage to parts in the apparatus or the lens to be processed, the operator protrudes outside the message display area E2 and is superimposed on the display so that the operator can easily recognize it. It is also possible to make it.

  In the numerical value display area E3, when the layout data is input, the distance between the geometric centers (FPD values) of the left and right lens frames of the spectacle frame, the interpupillary distance (PD value) of the eye of the spectacle wearer, the FPD value and the PD value The vertical direction component UP value (or Hlp value) of the shift amount which is the difference, each item of the processing size adjustment, and the like are displayed. At the initial setting, the suction center of the processing lens is displayed in addition to the FPD, PD, UP, and size described above. Furthermore, when inputting monitor data, numerical values related to dimensions relating to secondary chamfering of the spectacle lens are displayed.

  In the status display area E4, the right eye and left eyeglass lens layout images and the bevel shape formed on the middle (arbitrary) edge of the eyeglass lens other than the maximum, minimum, maximum and minimum edges, The side surface shape of the lens viewed from the above, a schematic diagram corresponding to the actual processing state, and the like are displayed.

(function key)
The function keys F1 to F6 are used at the time of setting related to the processing of the spectacle lens, or are used for response / selection to a message displayed on the liquid crystal display 8 in the processing process.

  The function keys F1 to F6 are used as follows at the time of setting related to machining (layout screen). That is, function key F1 is for lens type input, function key F2 is for lens material input, function key F3 is for frame type input, function key F4 is for chamfering type input, function key F5 is for mirror surface input, function Key F6 is used for inputting a machining course.

  The lens type input with the function key F1 includes “single focus”, “ophthalmic prescription”, “progressive”, “bifocal”, “cataract”, “plum”, “8 curve”, and the like. In the spectacles industry, “cataract” generally means a plus lens with a large refractive power, “bottle” means a negative lens with a large refractive power, and “8 curve” means a lens refracting surface. A curve made up of 8 curves.

  The material of the lens to be processed that is input with the function key F2 is plastic (hereinafter abbreviated as “plastic”), “high index”, “glass”, polycarbonate (hereinafter abbreviated as “polyca”), "Acrylic" etc.

  The types of eyeglass frames F that can be input with the function key F3 are “metal”, “cell”, “optil”, “flat”, “grooving (thin)”, “grooving (medium)”, “grooving” (Thick) ”etc.

  The types of chamfering that can be input with the function key F4 are “None”, “Small (front and back)”, “Medium (front and back)”, “Large (front and back)”, “Special (front and back) shown in FIGS. ) ”,“ Small (after) ”,“ middle (after) ”,“ large (after) ”,“ special (after) ”, etc.

  In addition, the pop-up indicating this chamfer position is “None”, “Small (front / rear)”, “Special ear (front / rear)”, “Special nose (front / rear)”, “Special (front / rear)”, “Small (front / rear)” "," Special ears (front and rear) "," special nose (front and rear) "," special (rear) ", etc.

  Examples of the mirror finishing input with the function key F5 include “none”, “present”, “mirror chamfering”, and the like.

  The machining course input by the function key F6 includes “auto”, “trial”, “monitor”, “frame change”, “internal trace”, and the like.

  The mode, type, or order of the function keys F1 to F6 described above is not particularly limited. In addition, the selection of the tabs TB1 to TB4 to be described later is not limited to the number of keys, such as providing function keys for selecting “layout”, “processing”, “processed”, “menu”, etc. Absent.

  On the function display portions H1 to H6 corresponding to the function keys F1 to F6, a lens type, a lens, a frame, a chamfer, a mirror surface, a course, and the like are displayed. In addition, the function display sections H1 to H6 display the contents corresponding to the lens type, lens, frame, chamfer, mirror surface, course, and the like, that is, the types and processing contents described above for selection by the function keys F1 to F6. The

In the following, the display state of the liquid crystal display 8 at the time of layout, immediately after system startup, immediately after data request, completion of layout setting, selection of each course, etc., or as the display state of the liquid crystal display 8 at the time of processing Confirmation of thickness, right-eye lens processing and finish, left-eye lens processing, etc. Further confirmation of display status of liquid crystal display 8 after processing, data storage, error icon and cursor / grooving processing during grinding In addition, the display and operation of chamfering, trial cutting, additional refinishing, etc. can be the same as in Japanese Patent Application No. 2000-287040 or Japanese Patent Application No. 2000-290864.
[Control circuit]
The lens grinding apparatus 2 has an arithmetic control circuit 40 as shown in FIG. An arithmetic control circuit 40 having a CPU is connected to an operation panel 67, a ROM 41 as a storage means, a data memory 42 as a storage means, and a RAM 43, and a correction value memory 44. The liquid crystal display 8 is connected to the arithmetic control circuit 40 through a display driver 45, and various drive motors (pulse motors) 47a to 47n of a drive system are connected through a pulse motor driver 46. The frame shape measuring apparatus 1 of FIG. 1 is connected through the communication port 48.

  For example, a drive motor 47a such as a pulse motor that moves the carriage up and down, a drive motor 47b such as a pulse motor that moves the carriage left and right, and a drive motor such as a pulse motor that rotates the lens rotation shafts 9 and 10 are provided. 47c, a drive motor that rotates the grinding wheel 11 is 47d, a drive motor such as a pulse motor that rotates the turning arm 16 up and down is 47e, and a drive motor that rotates the grinding wheel 11 is 47f.

  In this case, the carriage (not shown) can be moved up and down by rotating the drive motor 47a forward or backward, and the carriage can be moved left and right by rotating the drive motor 47b forward or backward. In addition, the lens rotation shafts 9 and 10 can be rotated forward or backward by rotating the drive motor 47c forward or backward. Further, the grinding wheel 11 can be rotationally driven by controlling the operation of the drive motor 47d. Further, by turning the drive motor 47e forward or backward, the turning arm 16 can be driven to turn upward or downward. Furthermore, the chamfering shaft (rotating shaft) 15 can be rotationally driven by controlling the operation of the drive motor 47f. Driving of the drive motors 47 a to 47 f of such a drive system is performed by the arithmetic control circuit 40.

  As shown in FIG. 5, when the processing control circuit 40 reads data from the frame shape measuring apparatus 1 or reads data stored in the storage areas m1 to m8 of the data memory 42 after the machining control is started. , Time-sharing machining control, data reading and layout setting control.

  That is, the period between times t1 and t2 is T1, the period between times t2 and t3 is T2, the period between times t3 and t4 is T3,..., And the period between times tn-1 and tn is Tn-1. Then, machining control is performed during the periods T1, T3,... Tn-1, and data reading and layout setting are controlled during the periods T2, T4,. Therefore, during the grinding of the lens to be processed, the next plurality of target lens shape data can be read and stored, the data can be read and the layout can be set (adjusted), and the data processing efficiency can be greatly improved. be able to.

  The ROM 41 stores various programs for controlling the operation of the lens grinding apparatus 2. The data memory 42 is provided with a plurality of data storage areas.

  The RAM 43 is provided with a processing data storage area 43a for storing data being processed, a new data storage area 43b for storing new data, and a data storage area 43c for storing frame data, processed data, and the like.

As the data memory 42, a readable / writable FEEPROM (flash EEPROM) can be used, or a RAM using a backup power source that prevents the contents from being erased even when the main power source is turned off can be used.
[Action]
Next, the operation of the lens grinding apparatus having the arithmetic control circuit 40 having such a configuration will be described.

  When the main power supply is turned on from the start standby state, the arithmetic control circuit 40 determines whether or not there is data read from the frame shape measuring apparatus 1.

  That is, the arithmetic control circuit 40 determines whether or not the “data request” switch 7 c of the operation panel 7 has been pressed. If the “data request” switch 7 c is pressed and there is a data request, the lens shape information (θi, ρi) data from the frame shape measuring apparatus 1 is read into the data reading area 43 b of the RAM 43. The read data may be stored (recorded) in any of the storage areas m1 to m8 of the data memory 42.

  When the lens shape information (θi, ρi) data is read, the arithmetic control circuit 40 causes the liquid crystal display 8 to display the display contents for the layout setting shown in FIG.

Below, each work process of layout setting in normal chamfering, chamfering simulation, and execution of chamfering will be described.
(I) Layout Display of Liquid Crystal Display 8 At the time of layout setting, the contents of normal chamfering processing as shown in FIG. 6 are displayed on the liquid crystal display 8 by the arithmetic control circuit 40. That is, in the display area E2 of the liquid crystal display 8, "lens: plastic" and "course: auto" are displayed, and a bevel and chamfering display 20 is displayed. In the display area E3, the frame geometric center distance FPD, the interpupillary distance PD of the spectacle wearer, the shift amount UP, the size “SIZE”, and their numerical values are displayed. In FIG. 6, FPD is 72.5, PD is 64.0, UP is +2.0, and SIZE is +0.00 as specified values (standard values). In the display area E3, “adsorption position: optical center” is displayed below “SIZE”.

  Further, the right lens shape LR and the lens suction plate Rs are displayed in a superimposed manner on the left side of the display area E4, and the left lens shape LL and the lens suction plate Ls are displayed in a superimposed manner on the right side of the display area E4. At this time, the optical center OR of the lens shape LR and the center of the lens suction plate Rs are matched, and the optical center OL of the lens shape LL and the center of the lens suction plate Ls are matched.

  Further, on the function display portions H1 to H6, a lens type, a lens, a frame, a chamfer, a mirror surface, a course, and the like are displayed, respectively. Further, for example, “single focus” is displayed on the function display unit H1, “pula” is displayed on the function display unit H2, “metal” is displayed on the function display unit H3, and the function display unit H4 displays. For example, “small (front and back)” is displayed, “yes” is displayed on the function display portion H5, and “auto” is displayed on the function display portion H6, for example.

  When the function key F4 corresponding to the function display portion H4 is pressed, a pop-up menu 21 as shown in FIGS. 7 and 8 is displayed. This pop-up menu 21 includes “none, small (front / rear), middle (front / rear), large (front / rear), special (front / rear), small (rear), middle (rear), large (rear), special (rear)”. The selected contents of the chamfer position such as are displayed. In this display state, “None, small (front / rear), middle (front / rear), large (front / rear), special (front / rear), small (rear), middle (rear), large (rear), special (rear)”, etc. Either color of the chamfer position is highlighted. The reversely displayed content is the chamfering position and is displayed on the function display portion H4. In FIG. 7, “small (front and rear)” is displayed as the chamfering position.

  The reverse display for this chamfering position is “None”, “Small (front / rear)”, “Medium (front / rear)”, “Large (front / rear)”, “Special (front / rear)”, It is executed in order for “small (back)”, “middle (back)”, “large (back)”, “special (back)”, and the like.

  When “special (front / rear)” is selected with the function key F4, as shown in FIG. 8, “special (front / rear)” is highlighted on the function display section H4, and the process proceeds to a special chamfering course. Even if “Special (after)” is selected, the course shifts to a special chamfering course. Further, the chamfered trajectories 31R and 31L after the chamfering are displayed on the target lens shapes LR and LL. In this case, the chamfering locus is displayed with standard values such as a chamfering width of 2.0 mm, a chamfering range of 80%, etc.

“Small (front / rear)”, “middle (front / rear)”, and “large (front / rear)” indicate the size of the chamfering width (small, medium, large) in normal chamfering and the spectacle lens ML. This means the chamfered part (front side, rear side) of the edge. The same applies to “small (rear)”, “middle (rear)”, and “large (rear)”, and the size of the chamfering width (small, medium, large) in normal chamfering, and the spectacle lens ML. This means the chamfered part (rear side) of the edge. In the “special (front / rear)”, the eyeglass lens position (hereinafter referred to as the ear side) of the eyeglass frame is chamfered at the edge of the front and rear refractive surfaces of the eyeglass lens ML. Or a chamfering process at a spectacle lens position (hereinafter abbreviated as the nose side) located on the nose pad (pad) side. Further, in the “special (rear)”, there is no chamfering at the edge of the front refractive surface of the spectacle lens ML, and chamfering on the ear side or the nose side of the chamfering at the edge of the rear refractive surface. means.
(Ii) Simulation screen for beveling and chamfering <Display of edge of eyeglass lens and bevel shape of edge of edge>
When the chamfering operation for the spectacle lens for the left eye is performed on the simulation screen after the display for special chamfering is executed as shown in FIG. 9, “auto” and “trial” are performed by operating the function key F6. "Monitor", "Change Frame", "Intra Trace", etc., select "Monitor" and then press the "Left" switch 6b to start machining.

  In the case of the simulation for the beveling process, the edge thickness measurement member 19 of the edge shape (lens shape) of the unprocessed spectacle lens based on the lens shape information (θi, ρi) which is the lens shape information is used. After measuring with the edge thickness measuring device (edge thickness measuring means), the shape of the edge of the edge including the hem (or shoulder of the bevel) of the bevel crest Y is shown in FIG. Display on the simulation screen.

  In FIG. 10, in the display area E2 of the liquid crystal display 8, the “surface width”, “ear side width”, “ear side range”, “nose side width”, and “nose side range” of the eyeglass lens for the left eye are displayed. Is displayed. Then, for example, the “surface width” is 0.3 (mm), the “ear side width” is 2.0 (mm), the “ear side range” is 90 (%), and the “nose side width” is 1.0 (mm). ), 90 (%), etc. are displayed as “nose side range”. In addition, a “frame curve” and a “bevel curve” are displayed below the display area E3 (data input unit).

  Further, on the left side of the display area E4, a left eye mark L, a lens shape LL for the left eye, an optical center OL of the lens shape LL, a geometric center BO of the lens shape LL, an upper lens width LLu, a lower lens width LLd, The right lens width LLr, the left lens width LL1, a special chamfer position mark Stc used also as a mark (target) indicating an arbitrary position, and a chamfer position mark Sfc indicating the position where the edge thickness and the chamfer width are the thinnest are displayed. Is done.

  In addition, in the upper right part of the display area E4, the cross-sectional shape 32 of the edge portion including the bevel shape in the chamfering position mark Sfc of the lens shape LL is displayed first, and for example, the bevel apex “Top: 1.0 [0.9] "and" Edg: 4.0 [4.0] "are displayed first. At the same time, the cross-sectional shape 33 of the edge at the special chamfering position mark Stc in the ear-side horizontal direction of the lens shape LL is first displayed at the lower right part of the display area E4, and for example, the bevel apex “Top: 1 .3 [1.2] "and" Edg: 6.8 [6.3] "and" Remaining width: 2.2 [2.3] "are displayed first.

  In addition, “position” is displayed on the lower edge of the liquid crystal display 8 corresponding to the function display H1, and “rotation” is displayed corresponding to the function display H2, corresponding to the function display H4. “Chamfer” is displayed, “Mirror surface” is displayed corresponding to the function display portion H5, and “Return” is displayed corresponding to the function display portion H6. Here, Y indicates a bevel mountain of the lens shape LL.

  Further, a pointer 34 extending to the special chamfer position mark Stc with the optical center OL of the lens shape LL as a center is displayed on the lens shape LL. When the function key F2 is pressed, the pointer 34 and the special chamfering position mark Stc move in the clockwise direction ("-" direction) on the lens shape LL as indicated by an arrow 35 shown in the function display portion H2. It has become. Further, when the function key F3 is pressed, the pointer 34 and the special chamfer position mark Stc move in the counterclockwise direction (“+” direction) on the lens shape LL as indicated by an arrow 36 shown in the function display portion H3. It is like that. As the pointer 34 and the special chamfering position mark Stc move, the state of the chamfered portion 37 at the moving position is displayed on the lower right side. For example, when the pointer 34 and the special chamfering position mark Stc move to the chamfering position mark Sfc side by this movement, the state of the chamfered portion 37 changes as indicated by a broken line.

  In the normal simulation screen, “size” is displayed at the bottom of the display area E3 (data input unit).

Further, in the case where the bevel hem is extremely narrow and the chamfer width cannot be sufficiently obtained in the spectacle lens after the bevel processing, or the edge thickness is extremely narrow and only the bevel ridge is formed, the bevel ridge and the bevel rim are formed. When chamfering over the skirt, the condition of “bite-in” control can be obtained on the simulation screen. This condition is calculated as (V) described later.
(Iii) Beveling When the simulation operation is not performed, selecting “Auto” shifts to the beveling chamfering operation. However, the display during processing is a simulation screen.

  When the beveling is executed, the “left” switch 6b is pushed again to start.

  The arithmetic control circuit 40 rotates the grinding wheel 11 by controlling the operation of the drive motor 47d, while the distance between the lens rotation shafts 9 and 10 and the wheel rotation shaft 12 is different for each angle θi (grinding wheel radius + movement). The drive motor 47a is rotated forward or reverse based on the lens shape information (θi, ρi) so that the diameter ρi) is reached, whereby the carriage (not shown) is moved up and down, and the front end of the carriage is moved up and down at every angle θi. Then, the front end portion of the carriage is turned up and down at every angle θi to move the lens rotation shafts 9 and 10 and the spectacle lens ML up and down. As a result, the spectacle lens ML is roughly ground into the lens shape information (θi, ρi) by the grinding wheel 11.

  Thereafter, when “chamfering” is set to other than “none” by the operation of the function key F4 at the time of layout, the lens shape measurement at the chamfering locus is executed.

  Further, the arithmetic control circuit 40 controls the operation of the drive motors 47a and 47d based on the lens shape information (θi, ρi) in the same manner as described above, and is roughly ground into the lens shapes (lens shapes) LL and LR. The bevel crest Y is ground by the bevel wheel 11b of the grinding wheel 11 at the edge of the edge of the spectacle lens ML. Yt is the bevel apex of the bevel mountain portion Y.

At this time, the arithmetic control circuit 40 controls the driving motor 47b that drives the carriage left and right based on the bevel position data set in advance, so that the edge of the spectacle lens ML roughly processed into a target lens shape is beveled. Apply processing. In planar processing, edge position data on the front surface of the lens is used as the bevel position data. This bevel position data (or front edge position data) is used as lens shape information (θi, ρi) of the front refractive surface fa or rear refractive surface fb of the eyeglass lens ML obtained when measuring the edge thickness of the eyeglass lens ML. It is obtained from the refractive surface position data in the axial direction of the measurement axis 19c at the corresponding position (see FIG. 14). For example, position data of a portion located in a predetermined position edge thickness direction from the refractive surface position data of the front refractive surface fa or the rear refractive surface fb based on the lens shape information (θi, ρi) is the bevel position data. Such beveling position data can be obtained by a known method.
(IV) Normal chamfering Chamfering is performed when “Chamfering” is set to other than “None” by operating the function key F4 during layout.

  The arithmetic control circuit 40 controls the operation of the drive motor 47f to rotationally drive the chamfering shaft (grooving shaft) 15 integrated with the chamfering grindstones 13, 14, the grooving cutter 17 and the like, and the special surface of (ii) The chamfering grindstones 13 and 14 chamfer the spectacle lens ML by chamfering the chamfering grindstones 13 and 14 by controlling the operation of the drive motor 47e based on the chamfer setting conditions.

This chamfering process includes corner portions (front side corner portions, abbreviated as “front surface” for convenience of explanation below) of the front-side refractive surface fr and the edge surface of the spectacle lens ML, and the rear-side refractive surface fb and the edge surface of the eyeglass lens ML. (Rear side corner, hereinafter abbreviated as “rear surface” for convenience of explanation).
(V) Biting control conditions during chamfering By the way, when the bevel hem is extremely narrow and the chamfer width cannot be taken sufficiently with the spectacle lens after beveling, or the edge thickness is extremely narrow, only the bevel peak is formed. In such a case, when chamfering over the bevel ridge and the bevel skirt, the “bite-in” control condition described below is obtained.

  Hereinafter, the biting control conditions will be described. Here, as shown in FIG. 11, the amounts of the bevel peak portion and the bevel hem portion formed on the edge surface of the spectacle lens after the beveling are defined for convenience. When measuring the edge shape (lens shape) of an unprocessed eyeglass lens using a lens shape measuring device, this is called correction measurement main measurement, and when measuring the edge shape (lens shape) of a spectacle lens after rough processing. This measurement correction measurement is called.

(A) Explanation of symbols used in arithmetic expressions for obtaining “bite-in” control Correction measurement Front position correction amount: A
Correction measurement rear surface position correction amount: B
Correction measurement front edge width: C
Correction measurement rear edge width: D
Main measurement front edge width: E
Rear edge width of this measurement: F
Chamfering wheel angle (front): θf Generally 47 °
Chamfering wheel angle (rear surface): θb
The chamfering grindstone of the lens grinding apparatus according to the present invention is
Two types of chamfering widths on the front surface that form an angle of 33 ° and 43 °: G Generally, 0.3 mm when the chamfering width is small
Rear chamfer width: H Generally, 0.3mm when chamfer width is small.
Front chamfer width (X component): I (ie, G x sin θf)
Rear chamfer width (X component): J (that is, H × sin θb)
Jug V angle: θv Normally 55 °
Sag height: K Usually 0.7mm or 0.85mm Sag width: L (ie, K x tanθv)
Normally, the biting correction value (the width of the cutting surface when biting into the bevel) is often 1 mm or 1.21 mm: M Chamfering Y control position (front) where biting is performed with a negative value: N
Chamfer Y control position (rear surface): O
The bevel position: P

(B) Principle of biting control Here, M is the width of the cutting surface when biting into the bevel.
The surface width that can be obtained by cutting the bevel V-shaped part is a,
If the surface width that can be obtained by cutting the bevel shoulder flat part is b,
M = a + b.
This amount M is converted into a correction value, and the default value is set to 0.3 mm (small chamfering standard).

  Since the actual processing result is not as calculated due to the influence of the lens front-rear curve, it is necessary to determine the default value by cutting a standard lens.

In addition, as shown in FIG. 12, in order to cope with the case where the chamfering width is set to 0.3 mm or less in a spectacle store or the like, when actually used, the change should be made with the following calculation formula. deep. That is, if the actual cutting surface width is M ′,
M ′ = worker setting small chamfer width + {M−0.3 mm}
As shown in FIG. 13, the edge portion of the eyeglass wearer's eyebrows has not been able to maintain a constant chamfering width with a chamfering width of 0.3 mm or less. The chamfer width can also be maintained at 0.3 mm for such edge portions. For example, if the default value of M is 0.25 mm on the front surface and 0.35 mm on the rear surface,
When shipped from the factory,
Front: M ′ = 0.3 + (0.25-0.3) = 0.25 mm
Rear surface: M ′ = 0.3 + (0.35-0.3) = 0.35 mm
If the chamfering width has been changed to 0.2mm at a spectacle store,
Front: M '= 0.2 + (0.25-0.3) = 0.15mm
Rear surface: M ′ = 0.2 + (0.35-0.3) = 0.25 mm
And adapt to changing the chamfer width.

(C) Front and rear biting control conditions (1) When there is no edge shortage <Front biting control conditions>
C ≧ L + I
Ｎ N = N
<Rear bite control conditions>
D ≧ L + J
∴ O = O
(2) Insufficient edge, including part of the bevel shoulder <Conditions for front bite control>
C <L + I
And E ≧ L
x0 = EL
Judge whether to bite into the bevel according to the amount of shoulder remaining x0. As shown in FIG.
(A) When 0 <x0 ≦ (M ′ × sinθf) Calculate the amount x that causes the deficiency to bite into the bevel.
x = (M′−x0 / sin θf) / (1 / sin θf + sin (90−θv) / sin (θv−θf))
= (M '-x0 / sinθf) / 5.489 (small chamfering wheel)
As required.
(B) When x0> (M ′ × sinθf) Corresponds to a chamfer of 0.3 mm or more with large chamfering and special chamfering.
x = 0
Ｎ N = P-((L + I) -x)
<Rear bite control conditions>
D <L + J
And F ≧ L
x0 = F−L
Judge whether to bite into the bevel according to the amount of shoulder remaining x0.
(I) When 0 <x0 ≦ (M ′ × sinθb) Calculation of the amount x that causes the deficiency to bite into the bevel.
x = (M′−x0 / sin θb) / (1 / sin θb + sin (90−θv) / sin (θv−θb))
= (M'-x0 / sinθb) /4.225 (small chamfering grindstone)
Asking.
(Ii) When x0> (M ′ × sinθb) Corresponds to a chamfer of 0.3 mm or more with large chamfering and special chamfering.
x = 0
∴ O = P + ((L + J) -x)
(3) Biting control conditions when the edge is insufficient and the shoulder width is less than the bevel shoulder width (3A). Cavity control condition when front edge is insufficient, under shoulder width, C <L + I
And E <L
[3A-1] Formula Calculate the distance X from the bevel shoulder width to the narrow bevel shoulder position. This distance X is
X = (LE) × (1-tan θf / tan θv)
= (LE) x 0.249 (small chamfering grindstone)
It becomes.
-[3A-2] Formula The amount x which makes a fine bevel bite is calculated.

x = M ′ / {(1 / sin θf + sin (90−θv) / sin (θv−θf))}
= M '/ 5.489 (small chamfering whetstone)
-[3A-3] Formula Then, as shown in FIG. 15, the amount (X + x) obtained by combining the distance X and the amount x to be bitten into the fine bevel is obtained, and this combined amount (X + x) is inward from the bevel shoulder position. Put in.

The distance from the bevel shoulder to the narrow bevel shoulder is made closer to X, and a certain amount x is further taken from there. If the combined amount (X + x) exceeds the bevel apex, there is a risk that the bevel apex may be cut to reduce the size, and thus a limitation is added. This limit is the distance required to bring the grindstone closer from the bevel shoulder to the bevel apex. Actually, the correction value has a margin of about 0.2 mm. (It is assumed that the chamfering bite limit narrow bevel edge width is common in the front and rear.) Here, in order to obtain the limit with the margin value Y0, assuming that the edge width is the margin value Y0 in [3A-1], the limit x_limit is
x_limit = (L−Y0) × (1−tan θf / tan θv).

If this limit is exceeded, the limit is set, and no further grindstones are allowed inside. In other words, the bite amount x is reduced .
From the above, the front chamfering Y control position N is
∴N = P-((L + I) -xcut (X + x))
As required.
However, if (X + x) exceeds the limit x_limit, ∴N = P − ((L + I) − (x_limit))
As required.
In addition, when calculating the edge width (minimum required edge width that does not reduce the bite amount x) when the limit is applied, there is a relationship of X + x = x_limit.
That is, [3A-1] expression + [3A-2] expression = [3A-3] expression [(LE) × (1-tanθf / tanθv)] +
[M ′ / {(1 / sin θf + sin (90−θv) / sin (θv−θf))}]
= (L−Y0) × (1-tanθf / tanθv)
It becomes. Because of the relationship
And when transforming this equation and solving for the edge width E,
E = M ′ / {(1 / sin θf + sin (90−θv) / sin (θv−θb)) × (1−tan θf / tan θv)} + Y0
= 0.3 / (5.489 × 0.249) + Y0
= 0.219 + 0.2
= 0.419mm (small chamfering wheel)
It becomes.
(3B). Biting control conditions when rear edge is insufficient, under shoulder width, D <L + J
And F <L
[3B-1] Formula Calculate the distance X from the bevel shoulder width to the narrow bevel shoulder position.

X = (L−F) × (1−tan θb / tan θv)
= (LF) x 0.347 (small chamfering grindstone)
-[3B-2] Formula The amount x to be bitten into the fine bevel is calculated. This amount of bite x is
x = M ′ / {(1 / sin θb + sin (90−θv) / sin (θv−θb))}
= M '/ 4.225 (small chamfering grindstone)
It becomes.
-[3B-3] type Put this combined amount (X + x) inward from the bevel shoulder position.

The distance from the bevel shoulder to the narrow bevel shoulder is made closer to X, and a certain amount of x is further taken from there. If this combined amount (X + x) exceeds the bevel apex, there is a risk that the bevel apex may be cut to reduce the size, so a restriction is added.
This limit is the distance required to bring the grindstone closer from the bevel shoulder to the bevel apex.
Actually, the correction value has a margin of about 0.2 mm. (The chamfer bite limit fine bevel width is common to the front and rear.) Here, to obtain the limit with the margin value Y0, assuming that the cover width is the margin value in [3B-1], the limit x_limit is
x_limit = (L−Y0) × (1−tan θb / tan θv).

If this limit is exceeded, the limit is set, and no further grindstones are allowed inside. In other words, the bite amount x is reduced .
From the above, the rear chamfering Y control position O is
∴O = P + ((L + I) -xcut (X + x))
As required.
However, if (X + x) exceeds the limit x_limit, ∴N = P + ((L + I)-(x_limit))
As required.
In addition, when calculating the edge width (minimum required edge width that does not reduce the bite amount x) when the limit is applied, there is a relationship of X + x = x_limit.
That is, [3B-1] expression + [3B-2] expression = [3B-3] expression [(LF) × (1-tan θb / tan θv)] +
[M ′ / {(1 / sin θb + sin (90−θv) / sin (θv−θb))}]
= (L−Y0) × (1-tan θb / tan θv)
It becomes. Because of the relationship
And when transforming this formula and solving for edge width F,
F = M ′ / {(1 / sin θb + sin (90−θv) / sin (θv−θb)) × (1−tan θb / tan θ
v)} + Y0
= 0.3 / (4.225 × 0.347) + Y0
= 0.205 + 0.2
= 0.405 mm (small chamfering grindstone)
It becomes.
(Vi) Chamfering control during chamfering processing Next, using the above-mentioned chamfering control conditions during chamfering processing (V), chamfering is performed at the corner of the front edge of the spectacle lens ML. This case will be described with reference to the flowchart of FIG. Note that the case of chamfering the corner portion of the rear edge of the spectacle lens ML is the same as the case of chamfering the corner portion of the front edge of the spectacle lens ML. Is omitted.

The arithmetic control circuit 40 starts the chamfering control of FIG. 16 when the beveling of (V) is completed.
Step S1
In this step S1, the arithmetic and control circuit 40 determines whether or not the edge surface width of the spectacle lens necessary for chamfering is insufficient by the determination formula A (C ≧ L + I), and if not, the operation proceeds to step S2S4. If there is a shortage, the process proceeds to step S4S2.
Step S2
In step S2, the arithmetic control circuit 40 determines whether or not the chamfer width is equal to or larger than the bevel shoulder width (width of the bevel hem) by the determination formula B (E ≧ L). If the width is less than the shoulder width, the process proceeds to step S3. If it is greater than the shoulder width, the process proceeds to step S5.
Step S3
In step S3, the arithmetic control circuit 40 moves the carriage (not shown) on the lens rotation shaft 9 based on the conditional expression (3) so that the chamfering can be performed based on the conditional expression (3). , 10 is controlled to move in the direction in which the axis of the lens 10 extends, and the spectacle lens ML held between the lens rotation shafts 9, 10 is moved in the direction in which the axis of the lens rotation shafts 9, 10 extends. The side is moved and controlled with respect to the chamfering grindstone 13 (or 15).

At this time, the arithmetic control circuit 40 controls the operation of the drive motor 47f to rotationally drive the chamfering shaft (grooving shaft) 15 integrated with the chamfering grindstones 13 and 14, the grooving cutter 17 and the like, and the swivel arm 16 Is turned up and down, the chamfering grindstone 13 (or 14) is used to chamfer the spectacle lens ML based on the arithmetic expression of the condition (3), and the process ends. This chamfering process is performed on the corner between the front refractive surface fr and the edge surface of the spectacle lens ML.
Step S4
In step S4, the arithmetic control circuit 40 moves the carriage (not shown) on the lens rotation shaft 9 based on the conditional expression (1) so that chamfering can be performed based on the conditional expression (1) of (V) described above. , 10 is controlled to move in the direction in which the axis of the lens 10 extends, and the spectacle lens ML held between the lens rotation shafts 9, 10 is moved in the direction in which the axis of the lens rotation shafts 9, 10 extends. The side is moved and controlled with respect to the chamfering grindstone 13 (or 15).

At this time, the arithmetic control circuit 40 controls the operation of the drive motor 47f to rotationally drive the chamfering shaft (grooving shaft) 15 integrated with the chamfering grindstones 13 and 14, the grooving cutter 17 and the like, and the swivel arm 16 Is turned up and down, the chamfering grindstone 13 (or 14) is used to chamfer the spectacle lens ML based on the arithmetic expression of the condition (1), and the process ends. This chamfering process is performed on the corner between the front refractive surface fr and the edge surface of the spectacle lens ML.
Step S5
In step S5, the arithmetic control circuit 40 moves the carriage (not shown) on the lens rotation shaft 9 based on the conditional expression (2) so that chamfering can be performed based on the conditional expression (2). , 10 is controlled to move in the direction in which the axis of the lens 10 extends, and the spectacle lens ML held between the lens rotation shafts 9, 10 is moved in the direction in which the axis of the lens rotation shafts 9, 10 extends. The side is moved and controlled with respect to the chamfering grindstone 13 (or 15).

  At this time, the arithmetic control circuit 40 controls the operation of the drive motor 47f to rotationally drive the chamfering shaft (grooving shaft) 15 integrated with the chamfering grindstones 13 and 14, the grooving cutter 17 and the like, and the swivel arm 16 The chamfering processing is performed on the spectacle lens ML by the chamfering grindstone 13 (or 14) on the basis of the arithmetic expression of the condition (2), and the process is finished. This chamfering process is performed on the corner between the front refractive surface fr and the edge surface of the spectacle lens ML.

  As described above, in the method for chamfering a spectacle lens according to an embodiment of the present invention, after forming the bevel crest Y having a bevel hem at the periphery of the spectacle lens ML, the spectacle lens ML The corners at the edge of the peripheral edge are chamfered by a chamfering grindstone (13, 14). In addition, the chamfering grindstone (13, 14) chamfers the corner to the bevel slope of the bevel hem and the bevel crest Y according to the width of the bevel hem and the chamfer. Is performed with a predetermined width over the entire circumference of the spectacle lens ML.

  According to the chamfering method of the spectacle lens, since the edge of the spectacle lens is narrow, the bevel hem is extremely narrow, or even in the edge portion of the spectacle lens where the bevel hem is hardly formed, The apparatus automatically determines according to the width of the bevel hem and can perform chamfering with a certain chamfering width, so that chamfering can be performed.

  In addition, the eyeglass lens chamfering apparatus according to the embodiment of the present invention includes lens rotation shafts 9 and 10 for sandwiching a beveled spectacle lens ML in which a bevel crest Y is formed on the periphery, and the lens rotation shaft 9. , 10 for rotating and driving, a chamfering grindstone (13, 14) for chamfering the edge of the eyeglass lens ML after beveling, and the chamfering grindstone ( 13, 14) a second driving means (drive motor 47f) for rotationally driving, and a third driving means for driving the lens rotating shafts (9, 10) and the chamfering grindstones (13, 14) relatively close to and away from each other. Driving means (driving motors 47a, 47b, 47e), arithmetic control means (arithmetic control circuit 40) for driving and controlling the first to third driving means (driving motors 47a, 47b, 47c, 47e, 47f), , Of the said bevel mountain part Y Data input means for inputting data of the width of the Gen skirt and a (operation panel 7). In addition, the arithmetic control means (the arithmetic control circuit 40) is configured to determine the bevel skirt, the bevel hem, and the bevel slope of the bevel ridge Y according to the input width data of the bevel hem of the bevel ridge Y. It is determined whether or not chamfering is performed up to the surface, and the first to third drive means (drive motors 47a, 47b, 47c, 47e, 47f) are driven and controlled based on the determined result, and the chamfering grindstone is According to (13, 14), the corner portion is chamfered to the bevel hem portion and the bevel slope surface of the bevel peak portion Y, and the chamfering processing is performed with a predetermined width over the entire circumference of the spectacle lens ML. It has become.

  According to this spectacle lens chamfering apparatus, because the edge of the spectacle lens is narrow, the bevel hem is extremely narrow, or even at the edge of the spectacle lens where the bevel hem is hardly formed, The apparatus automatically determines according to the width of the bevel hem and can perform chamfering with a certain chamfering width, so that chamfering can be performed.

  Furthermore, the eyeglass lens chamfering method and the chamfering apparatus according to the embodiment of the present invention include lens shape measuring means (edge thickness measuring member 19 and its movement amount measuring unit) for measuring the edge thickness Wi of the eyeglass lens ML. Or beveling of the spectacle lens ML after beveling using a chamfering means (including a chamfering shaft 15, a turning arm 16, a drive motor 47f, etc.) having the chamfering grindstone (13, 14). The width of the skirt can also be measured.

  According to this configuration, the width of the bevel hem can be accurately measured easily using the existing configuration.

It is explanatory drawing which shows the relationship between a lens grinding processing apparatus provided with the layout display apparatus which concerns on embodiment of this invention, and a frame shape measuring apparatus. 1 shows a lens grinding apparatus according to an embodiment of the present invention, and is a perspective view of a main processing part in a processing chamber. 1 shows a lens grinding apparatus according to an embodiment of the present invention, in which (A) is an enlarged explanatory view of a first operation panel, and (B) is a front view of a liquid crystal display. It is explanatory drawing of the control circuit of the lens grinding processing apparatus which concerns on embodiment of this invention. It is a time chart for demonstrating control of a control circuit. It is explanatory drawing which shows the example of a display of the normal chamfering process of the liquid crystal display of FIG. It is explanatory drawing which shows the pop-up menu displayed on the liquid crystal display of FIG. It is a figure which shows the state which selected "special (front and back)" in the pop-up menu shown in FIG. It is a figure for demonstrating the state in which an example of the display for special chamfering was shown on the screen. It is explanatory drawing which shows the state by which the simulation screen was displayed on the liquid crystal display. It is explanatory drawing of the chamfering method concerning this invention. It is another explanatory drawing of the chamfering method concerning this invention. It is another explanatory drawing of the chamfering method concerning this invention. It is another explanatory drawing of the chamfering method concerning this invention. It is another explanatory drawing of the chamfering method concerning this invention. It is a flowchart for demonstrating the chamfering method concerning this invention.

Explanation of symbols

ML ... Eyeglass lens Y ... Yamagen mountain part 7 ... Operation panel (data input means)
9, 10 ... lens rotation shafts 13, 14 ... chamfering grindstone 40 ... arithmetic control circuit (arithmetic control means)
47a ... Driving motor (part of third driving means)
47b ... Driving motor (part of third driving means)
47c ... Driving motor (first driving means)
47e ... Drive motor (part of third drive means)
47f ... Drive motor (second drive means)

Claims (4)

Forming a bevel ridge having a bevel hem and a bevel apex at the edge of the edge of the peripheral edge of the spectacle lens, and a width from the position of the bevel apex at the edge to the hem of the bevel hem It was a bevel shoulder width, and after the width from the position of the bevel apex in the edge end to the refractive surface of the spectacle lens was edge width, surface corners by chamfering grindstone of the edge end of the peripheral edge of the spectacle lens In the chamfering method of the spectacle lens to be processed,
The default chamfer width of the chamfered cut surface by the chamfering process is M, the actual chamfering chamfering width of the chamfering process is M ′, and the cutting width is M ′.
M ′ = worker setting small chamfering width + [M−width of chamfering standard]
So that you can ask
The chamfer width of the chamfer formed at the corner of the edge by the chamfering is larger than the width obtained by subtracting the bevel shoulder width from the edge width, and a value obtained by adding the bevel shoulder width to the chamfer width is If smaller than the edge width,
The chamfering grindstone chamfers the bevel hem and the bevel crest of the bevel crest at the corner, and the chamfering is performed over the entire circumference of the spectacle lens based on the cutting width M ′. A method for chamfering a spectacle lens. Edge thickness measuring means for measuring the edge thickness of the spectacle lens based on lens shape information (θi, ρi) of the spectacle lens read by the target lens shape measuring device;
A lens rotation axis for sandwiching the spectacle lens after the beveling , in which a bevel hem and a bevel ridge having a bevel apex are formed at the edge of the edge of the edge ;
First driving means for rotationally driving the lens rotation shaft;
A chamfering grindstone for chamfering the edge of the eyeglass lens after beveling,
Second driving means for rotationally driving the chamfering grindstone;
Third driving means for driving the lens rotating shaft and the chamfering grindstone relatively closer to and away from each other; arithmetic control means for driving and controlling the first to third driving means;
When the width from the position of the bevel apex at the edge of the edge to the hem end of the bevel hem is the bevel shoulder width of the bevel hem of the bevel ridge, data input means for inputting data of the bevel shoulder width is provided. An eyeglass lens chamfering device,
When the default chamfer width of the chamfered cut surface by the chamfering process is M and the chamfered cut width of the actual chamfering process is M ′, the cutting width is M ′.
M ′ = worker setting small chamfering width + [M−width of chamfering standard]
In addition, the width from the position of the bevel apex at the edge of the edge to the refractive surface of the spectacle lens is defined as the edge width, and the width of the chamfer formed at the corner of the edge by the chamfering is chamfered. When the width
It said arithmetic control unit, the chamfer width, said bevel shoulder, from the edge width, it is determined whether the chamfer to bevel inclined surface of the bevel skirt or bevel skirt and bevel crest, the chamfer The chamfer width of the chamfer formed at the corner of the edge of the edge by processing is larger than the width obtained by subtracting the bevel shoulder width from the edge width, and the value obtained by adding the bevel shoulder width to the chamfer width is the edge width. If smaller, the prior SL first to third drive means controlled and driven, the is chamfered to bevel inclined surface of the bevel skirt and bevel mountain portion to the corner portion by the chamfering abrasive wheel said surface An apparatus for chamfering a spectacle lens, wherein chamfering is performed on the entire circumference of the spectacle lens based on the cutting width M ′ . The method for chamfering a spectacle lens according to claim 1.
The lens shape measuring means for measuring the edge thickness of the spectacle lens or the chamfering means having the chamfering grindstone is used to measure the width of the bevel hem of the spectacle lens after beveling. A method for chamfering eyeglass lenses. The spectacle lens chamfering apparatus according to claim 2,
The lens shape measuring means for measuring the edge thickness of the spectacle lens or the chamfering means having the chamfering grindstone is used to measure the width of the bevel hem of the spectacle lens after beveling. A chamfering device for eyeglass lenses.

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