EP2529885A2 - Vorrichtung zum Bearbeiten von Brillengläsern - Google Patents

Vorrichtung zum Bearbeiten von Brillengläsern Download PDF

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Publication number
EP2529885A2
EP2529885A2 EP12004145A EP12004145A EP2529885A2 EP 2529885 A2 EP2529885 A2 EP 2529885A2 EP 12004145 A EP12004145 A EP 12004145A EP 12004145 A EP12004145 A EP 12004145A EP 2529885 A2 EP2529885 A2 EP 2529885A2
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EP
European Patent Office
Prior art keywords
lens
flat
processing
finishing
edge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12004145A
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English (en)
French (fr)
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EP2529885A3 (de
Inventor
Kyoji Takeichi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nidek Co Ltd
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Nidek Co Ltd
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Filing date
Publication date
Application filed by Nidek Co Ltd filed Critical Nidek Co Ltd
Publication of EP2529885A2 publication Critical patent/EP2529885A2/de
Publication of EP2529885A3 publication Critical patent/EP2529885A3/de
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
    • B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
    • B24B9/148—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms electrically, e.g. numerically, controlled

Definitions

  • the present invention relates to an eyeglass lens processing apparatus for processing the periphery of an eyeglass lens.
  • An eyeglass lens processing apparatus which is equipped with lens chuck shafts for holding an eyeglass lens, a tool rotation shaft to which plural grindstones such as a roughing grindstone, a finishing grindstone (normal finishing grindstone) having a bevel groove and a flat-processing portion, and a polishing grindstone having a bevel polishing groove and flat-processing portion are attached concentrically (refer to JP-A-2010-280018 ). Also known is an apparatus in which to enable beveling of a high-curvature lens a finishing grindstone for high-curvature beveling is also attached to the tool rotation shaft (refer to JP-A-2008-254077 ).
  • Plural grindstones are combined as processing tools to meet the needs of a user.
  • the width of each grindstone needs to be reduced to house all the grindstones in the limited space of a processing room.
  • the widths of the flat-processing portions of the normal finishing grindstone and the polishing grindstone are reduced, the thickness of processable lenses (lens edges) is decreased and such an eyeglass lens processing apparatus can no longer automatically process a lens whose thickness is larger than the widths of the flat-processing portions.
  • the widths of the flat-processing portions are increased to enable automatic processing by an eyeglass lens processing apparatus, the size of the apparatus is increased accordingly, which makes it necessary to increase the rigidity of its processing mechanism and thereby causes increase in manufacturing cost. For this reason, flat processing of lenses having large edge thickness values have been performed by manual processing apparatus.
  • a technical object of the present invention is to provide an eyeglass lens processing apparatus capable of increasing the thickness of lenses that can be flat finished without the need for increasing the widths of processing tools.
  • the invention provides eyeglass lens processing apparatus that are configured in the following manners:
  • the invention makes it possible to increase the thickness of lenses that can be subjected to flat finishing without the need for increasing the widths of processing tools.
  • FIG. 1 outlines the configuration of a processing mechanism of an eyeglass lens processing apparatus according to the embodiment.
  • the eyeglass lens processing apparatus includes a lens rotation unit 110 for rotating a pair of lens chuck shafts 112R and 112L which hold an eyeglass lens LE between them, a tool rotation unit 120 for rotating a tool rotation shaft 125 to which a periphery processing tool 160 for processing the periphery of the lens LE are attached, an X-direction moving unit 130 which moving the lens chuck shafts 112R and 112L with respect to the tool rotation shaft 125 in the lens check shaft direction (X direction), a Y-direction moving unit 140 for moving the lens chuck shafts 112R and 112L with respect to the tool rotation shaft 125 in such a direction (Y direction) as to change their axis-to-axis distance, and edge position detection units (lens shape measuring units) 300F and 300R for detecting edge positions of the front surface and the rear surface of the lens LE corresponding to respective radius vector angles of the lens LE.
  • a lens rotation unit 110 for rotating a pair of lens chuck shafts 112R and 112L
  • a carriage unit 100 is mounted on a base 100A of the processing apparatus body 1.
  • the lens chuck shafts 112L and 112R are held rotatably by a left arm 101L and a right arm 101R of a carriage 101, respectively.
  • the lens chuck shaft 112R is moved toward the lens chuck shaft 112L by a motor 114 which is attached to the right arm 101 R, whereby the lens LE is held by the two lens chuck shafts 112L and 112R.
  • the two lens chuck shafts 112L and 112R are rotated so as to be synchronized with each other by a motor 111 which is attached to the left arm 101L, via a rotation transmission mechanism such as gears.
  • the lens rotation unit 110 is configured by the above members etc.
  • the edge of the lens LE to be processed which is held by the lens chuck shafts 112L and 112R is processed by the periphery processing tools 160 which are attached to the tool rotation shaft (grindstone spindle) 125 concentrically.
  • the tool rotation shaft 125 is disposed parallel with the lens chuck shafts 112L and 112R.
  • the periphery processing tools 160 are consists of plural grindstones (see Fig. 3 ).
  • the tool rotation shaft 125 is rotated by a motor 121.
  • the tool rotation unit 120 is configured by the above members etc.
  • the tools 160 may include a cutter.
  • the carriage 101 is mounted on an X movement support base 132 which can be moved along shafts 133 and 134 which extend parallel with the lens chuck shafts 112L and 112R.
  • a ball screw (not shown) which extends parallel with the shaft 133 is attached to a rear portion of the support base 132.
  • the ball screw is also attached to the rotary shaft of an X-direction moving motor 131.
  • the lens chuck shafts 112L and 112R are moved linearly in the X direction (i.e., the axis direction of the lens chuck shafts 112L and 112R) together with the support base 132.
  • the X-direction moving unit 130 is configured by the above members etc.
  • the rotary shaft of the motor 131 is provided with an encoder 131a which is a detector for detecting a movement position of the carriage 101 in the X direction.
  • Two shafts 146 which extend in the Y direction (the direction in which the axis-to-axis distance between the tool rotation shaft 125 and the lens chuck shafts 112L and 112R is changed) which is perpendicular to the X direction are fixed to the support base 132.
  • the carriage 101 is mounted on the support base 132 so as to be movable in the Y direction along the shafts 146.
  • a Y-direction moving motor 141 is fixed to the support base 132. Rotation of the motor 141 is transmitted to a ball screw 145 which extends in the Y direction. As the ball screw 145 is rotated, the lens chuck shafts 112L and 112R are moved in the Y direction together with the carriage 101.
  • the Y-direction moving unit 140 is configured by the above members etc.
  • the rotary shaft of the motor 141 is provided with an encoder 141a which is a detector for detecting a movement position of the lens chuck shafts 112L and 112R in the Y direction.
  • the X-direction moving unit 130 and the Y-direction moving unit 140 may be configured so that the tool rotation shaft 125 is moved in the X direction and the Y direction with respect to the lens chuck shafts 112L and 112R.
  • the Y-direction moving unit 140 may be such as to swing the left arm 101L and the right arm 101R of the carriage 101.
  • the lens edge position detection units (lens shape measuring units) 300F and 300R are disposed on the top-left and top-right of the carriage 101.
  • Fig. 2 outlines the configuration of the detection unit 300F for detecting edge positions of the front surface (front refraction surface) of the lens LE.
  • a support base 301F is fixed to a block 300a which is fixed to the base 100A.
  • a tracing stylus arm 304F is held by the support base 301 F via a slide base 310F so as to be slidable in the X direction.
  • An L-shaped hand 305F is fixed to a tip portion of the tracing stylus arm 304F.
  • a tracing stylus 306F is fixed to the tip of the hand 305F.
  • the tracing stylus 306F is brought into contact with the front surface of the lens LE.
  • a rack 311F is fixed to a bottom end portion of the slide base 310F.
  • the rack 311F is engaged with a pinion 312F of an encoder 313F which is fixed to the support base 301F.
  • Rotation of a motor 316F is transmitted to the rack 311F via a rotation transmission mechanism such as gears 315F and 314F, whereby the slide base 310F is moved in the X direction.
  • the tracing stylus 306F which is located at an escape position is moved toward the lens LE and pressed against the front surface of the lens LE at a certain measurement pressure.
  • the lens chuck shafts 112L and 112R are moved in the Y direction while being rotated according to a target lens shape and edge positions of the front surface of the lens LE in the X direction are detected by the encoder 313F for respective radius vector angles of the target lens shape. It is preferable that edge positions be detected along a measurement path of the target lens shape and a measurement path that is a predetermined length (e.g., 1 mm) outside the former. Inclinations of the lens surface with the target lens shape are calculated on the basis of results of the edge position detection along these two measurement paths.
  • the configuration of the lens edge position detection unit 300R for the rear surface (rear refraction surface) of the lens LE will not be described below.
  • the constituent elements of the lens edge position detection unit 300R will be given symbols that are obtained by replacing the suffix "L” of the symbols of the corresponding constituent elements of the lens edge position detection unit 300L shown in Fig. 2 with "R.”
  • Edge positions of the rear surface of the lens LE in the X direction are detected by the encoder 313R for the respective radius vector angles of the target lens shape.
  • inclinations of the lens surface with the target lens shape are calculated on the basis of results of edge position detection along the measurement path of the target lens shape and the measurement path that is the predetermined length outside the former.
  • the lens edge position detection units 300L and 300R are configured in such a manner that the lens chuck shafts 112L and 112R are moved in the Y direction, the tracing styluses 306F and 306R may be moved in the Y direction.
  • a chamfering unit 200 is disposed at an operator-side position on the apparatus body 1 and a hole/groove forming mechanism unit 400 is disposed behind the carriage unit 100.
  • a chamfering grindstone for a lens front surface and a chamfering grindstone for a lens rear surface are attached to a rotary shaft concentrically.
  • the carriage unit 100, the lens edge position detection units 300F and 300R, the chamfering unit 200, and the hole/groove forming mechanism unit 400 can be configured basically in the same manners as described in JP-A-2003-145328 and hence will not be described in detail.
  • Fig. 3 shows example structures of the plural periphery processing tools 160 that are attached to the tool rotation shaft 125 concentrically.
  • the periphery processing tools 160 are an normal finishing grindstone 161 to be used for beveling and flat processing, a polishing grindstone 163 to be used for bevel polishing and flat processing, a high-curvature bevel finishing grindstone 165 to be used for high-curvature beveling, and a roughing grindstone 167 for plastic lenses (arranged in this order from the front side).
  • the terms "front” and “rear” will be used as corresponding to the sides of the front surface and the rear surface, respectively, of the lens LE held by the lens chuck shafts 112L and 112R.
  • the finishing grindstones 161 and 163 are used for processing a low-curvature lens.
  • the normal finishing grindstone 161 has a V groove (bevel groove) 161v for beveling, a front foot processing portion (front foot processing surface) 161a for formation of a front bevel foot of the lens front surface (located on the front side of the V groove 161 v), and a flat-processing portion (flat-processing surface) 161 b located on the rear side of the V groove 161v.
  • the front foot processing portion 161a and the flat-processing portion 161b are located adjacent to the V groove 161v.
  • the front foot processing portion 161 a, the V groove 161v, and the flat-processing portion 161 b are formed integrally using a grindstone that is uniform in grain size.
  • the groove width of the V groove 161v is 2.5 mm
  • the width of the front foot processing portion 161a is 4.5 mm
  • the width 161wb of the flat-processing portion 161 b is 9 mm.
  • the flat-processing portion 161 b also serves as a processing surface for forming a rear bevel foot of the lens LE when the lens LE is beveled by the V groove 161 v.
  • a front bevel slant surface and a rear bevel slant surface are formed simultaneously in the lens LE by the V groove 161 v.
  • the front slant surface and the rear slant surface, arranged in the X direction, of the V groove 161v both have an angle 35° and the depth of the V groove 161v is less than 1 mm.
  • the front foot processing portion 161a is a tapered surface having an inclination angle ⁇ f so that the diameter of the front portion of the lens LE increases as the position goes in the positive X direction.
  • the inclination angle ⁇ f is 5.0°, for example.
  • the flat-processing portion 161b is a tapered surface having an inclination angle ⁇ r so that the diameter of the rear portion of the lens LE decreases as the position goes in the positive X direction.
  • the inclination angle ⁇ r is 2.5°, for example.
  • the flat-processing surface 161 b may be parallel with the X direction. However, for a good appearance of the lens LE, it is preferable that the flat-processing surface 161b be inclined so that the diameter of the rear portion of the lens LE decreases as the position goes in the positive X direction.
  • the polishing grindstone 163 has a V groove 163v for beveling, a front foot processing portion 163a for formation of a front bevel foot of the lens front surface (located on the front side of the V groove 163v), and a flat-processing portion 163b located on the rear side of the V groove 163v.
  • the front foot processing portion 163a and the flat-processing portion 163b are located adjacent to the V groove 163v.
  • the front foot processing portion 163a, the V groove 163v, and the flat-processing portion 163b are formed integrally using a grindstone that is uniform in grain size.
  • the grain size of the polishing grindstone 163 is smaller than that of the normal finishing grindstone 161.
  • the groove width of the V groove 163v, the width of the front foot processing portion 163a, and the width 163wb of the flat-processing portion 163b are set the same as the widths of the front foot processing portion 161 a, the V groove 161v, and the flat-processing portion 161b of the normal finishing grindstone 161, respectively.
  • the shape of the V groove 163v is the same as that of the V groove 161v of the normal finishing grindstone 161.
  • the total widths of the finishing grindstones 161 and 163 are approximately the same as or smaller than the total width of the roughing grindstone 167.
  • the high-curvature bevel finishing grindstone 165 has a front beveling slant surface 165a for formation of a front bevel slant surface of the lens LE, a rear beveling slant surface 165b for formation of a rear bevel slant surface of the lens LE, and a rear bevel foot processing slant surface 165c for formation of a rear bevel foot.
  • the processing surfaces 165a, 165b, and 165c are formed integrally using a grindstone that is the same as the normal finishing grindstone 161 in grain size.
  • the width of the front beveling slant surface 165a and the width of the rear beveling slant surface 165b are larger than the width of the V groove 161v of the normal finishing grindstone 161.
  • the widths of the front beveling slant surface 165a and the rear beveling slant surface 165b are 9 mm and 3.5 mm, respectively.
  • the width of the rear bevel foot processing slant surface 165c is 4.5 mm, for example.
  • the angle with respect to the X direction of the front beveling slant surface 165a is smaller than that of the V groove of the normal finishing grindstone 161 and is 30°, for example.
  • the angle with respect to the X direction of the rear beveling slant surface 165b is larger than that of the V groove of the normal finishing grindstone 161 and is 45°, for example.
  • the angle with respect to the X direction of the rear bevel foot processing slant surface 165c is larger than that of the flat-processing portion 161b of the normal finishing grindstone 161 and is 15°, for example.
  • Data of the positions and widths of the respective processing portions (front foot processing portion 163a, V groove 163v, and flat-processing portion 163b) of the normal finishing grindstone 161 are stored in a memory 51.
  • data of the positions and widths of the respective processing portions of the polishing grindstone 163 are also stored in the memory 51.
  • Fig. 4 is a control block diagram of the eyeglass lens processing apparatus according to the embodiment.
  • An eyeglass frame shape measuring unit 2 (which can be the same one described in JP-A-4-93164 ), a touch screen type display 5 which is used as a display unit and an input unit, a switch unit 7, the memory 51, the motors of the carriage unit 100, the lens edge position detection units 300F and 300R, the hole/groove forming mechanism unit 400, etc. are connected to a control unit 50.
  • An input signal can be input to the apparatus by touching an item displayed on the display 5 with a touch pen or a finger.
  • the control unit 50 receives an input signal through the touch screen function of the display 5 and controls display of a figure and information on the display 5.
  • Target lens shape data of an eyeglass frame measured by the eyeglass frame shape measuring unit 2 is input to the apparatus by pushing a switch of the switch unit 7.
  • Layout data of a lens optical center for the target lens shape are input through the display 5.
  • the target lens shape FT is displayed on the screen 500 of the display 5, and a state is established that layout data such as a pupil distance (PD value) 501 of an eyeglass user, a frame center distance (FPD value) 502 of the eyeglass frame, and a height 503 of the optical center with respect to a geometrical center of the target lens shape can be input.
  • Layout data are input by manipulating predetermined keys displayed on the display 5.
  • Lens processing conditions are input by manipulating predetermined keys such as keys 511-515 displayed on the display 5.
  • the lens processing conditions include a lens material, a frame type, a processing mode (beveling, flat processing, or groove formation), execution/non-execution of polishing processing, execution/non-execution of chamfering, and execution/non-execution of high-curvature beveling.
  • the beveling mode is selected automatically if "metal" or "cell” is selected as a frame type.
  • the flat-processing mode is selected automatically if a rimless frame ("two point" or "half-rim”) is selected. The following description will be directed to a case that the flat-processing mode is selected.
  • the data xfn are the values of front surface edge positions with respect to a reference position in the X direction.
  • the measurement points n are set for angles that are separated from each other by a predetermined very small angle and N is equal to 1,000, for example.
  • the data xfn are the values of rear surface edge positions with respect to the reference position in the X direction.
  • the threshold value TS1 is a value which is predetermined in connection with the width 161wb of the flat-processing portion 161b and is a maximum value that substantially enables flat processing with the width 161wb. That is, the threshold value TS1 is a value corresponding to a width of the flat-processing portion which substantially functions to perform flat processing.
  • the maximum substantially processable width is set at 8 mm which is the width of a range defined by positions that are deviated inward by 0.5 mm from the two respective ends of the flat-processing portion 161 b.
  • the width 161 wb and the threshold value TS1 are stored in the memory 51.
  • the control unit 50 judges that the entire periphery of the lens can be processed by the flat-processing portion 161 b. In this case, the control unit 50 calculates X positions corresponding to respective lens rotation angles so that the front surface edges and the rear surface edges of a finished lens both fall within the width of the flat-processing portion 161b. For example, as shown in Fig.
  • the control unit 50 calculates (determines) X positions (processing positions in the X direction) for the respective lens rotation angles so that the front surface edge is always located at a position 161bP1 that is 0.5 mm inside (on the rear side of) the front end 161bf of the flat-processing portion 161 b.
  • lens processing points that are based on the target lens shape are not located on the Y axis which connects the center axis of the tool rotation shaft 125 and that of the lens chuck shafts 112L and 112R. Therefore, lens processing points corresponding to the respective lens rotation angles are calculated again. For example, lens processing points corresponding to the respective lens rotation angles can be calculated by the following method.
  • the maximum L value corresponding to the lens rotation angle ⁇ i is represented by Li, and xfn for the corresponding radius vector angle ⁇ n is rewritten as Xfi.
  • Li and Xfi are made fundamental control data in the Y direction and the X direction, respectively, corresponding to the lens rotation angle ⁇ i.
  • the control unit 50 causes the roughing grindstone 167 to processes the lens roughly.
  • Rough processing data are obtained by adding a predetermined finishing margin ⁇ L to target lens shape data (finishing data).
  • the control unit 50 causes the lens edge to be placed on the processing surface of the roughing grindstone 167 by drive-controlling the X-direction moving unit 130.
  • the control unit 50 rotates the lens by drive-controlling the lens rotation unit 110 and drive-controls the Y-direction moving unit 140 on the basis of axis-to-axis distances Li + ⁇ L corresponding to the respective lens rotation angles.
  • the control unit 50 determines processing positions (i.e., lens edge positions with respect to the flat-processing portion 161 b) of in the X direction with which the front surface edges and the rear surface edges of the lens fall within the width of the flat-processing portion 161b. And the control unit 50 causes the flat-processing portion 161b to perform flat finishing on the periphery of the roughly processed lens by drive-controlling the X-direction moving unit 130 and the Y-direction moving unit 140 while rotating the lens on the basis of the determined processing positions.
  • processing positions i.e., lens edge positions with respect to the flat-processing portion 161 b
  • the position in the X direction is controlled so that the front surface edge is located at the processing position 161bP1 every time the lens is rotated by the predetermined rotation angle.
  • the control unit 50 divides a process of a flat-finishing into plural stages. At each stage, the control unit 50 determines processing positions (the lens edge is shifted in the X direction with respect to the flat-processing portion 161b) on the basis of front surface edge positions Lcf and/or rear surface edge positions Lcr so that a lens portion that has not been flat finished will be processed and causes the flat-processing portion 161 b to perform flat finishing on the periphery of a roughly processed lens by drive-controlling the X-direction moving unit 130 and the Y-direction moving unit 140 on the basis of the determined processing positions.
  • one of a front surface edge position Lcf and a rear surface edge position Lcf can be calculated on the basis of the other.
  • positions of the front foot processing portion 161 a, the V groove 161 v, and the flat-processing portion 161b which are stored in the memory 51 are used as fundamental data.
  • the control unit 50 divides a process of a flat-finishing into a first stage and a second stage.
  • the control unit 50 determines sets of processing positions which are shifted in the X direction for the first stage and the second stage on the basis of front surface edge positions Lcf and rear surface edge positions Lcr of the lens, and causes the flat-processing portion 161b to perform flat finishing on the periphery of the lens in two stages.
  • the control unit 50 determines processing positions in the X direction (X position control data corresponding to respective lens rotation angles) so that the front surface edges of the lens fall within the width of the V groove 161v for beveling (i.e., the front surface edges are located outside the width of the flat-processing portion 161 b) and the rear surface edge of a thickest edge portion of the lens falls within the width of the flat-processing portion 161 b, and causes the flat-processing portion 161b to perform flat finishing on the periphery of the lens by controlling the X-direction moving unit 130 on the basis of the determined processing positions.
  • An example control which is performed at the first stage will be described below.
  • the rear surface edge corresponding to the determined radius vector angle ⁇ tmax is located at a processing position 161bP2 that is set 0.5 mm inside (on the front side of) the rear end 161br of the flat-processing portion 161b. As shown in Fig. 6A , the front surface edge is located within the width of the V groove 161v for beveling.
  • the lens is rotated one or more times.
  • a bevel portion Lv which has been formed by the V groove 161v is left on the front side of a lens edge as a non-processed portion.
  • a position Xtm is determined for a reference state that the rear surface edge of a thickest edge portion is located at the processing position 161bP2
  • a position Xtm is determined in advance.
  • a line Lt included in the surface of the flat-processing portion 161 b is extended forward and an intersecting point Px of the line Lx and the front bevel slant surface 161vf of the V groove 161v, and the intersecting point Px (or a position that is slightly shifted rearward from the intersecting point Px) is determined as a position Xtm.
  • a position Xtm is set at a limit position of the front surface edges.
  • the control unit 50 drive-controls the X-direction moving unit 130 so that the front surface edges are located at the position Xtm. In this method, since the position Xtm is fixed, writing of a control program for the apparatus is simplified.
  • the control unit 50 determines processing positions in the X direction so that they are shifted from the processing positions employed at the first stage. More specifically, to perform flat finishing on the bevel portion Lv that remains as an unprocessed portion, the control unit 50 calculates X position control data of processing positions in the X direction so that the front surface edges of the lens fall within the width of the flat-processing portion 161b, and causes the flat-processing portion 161 b to perform flat finishing by controlling the X-direction moving unit 130 while rotating the lens on the basis of the calculated X position control data.
  • the bevel portion Lv remaining at the front end of the periphery (see Fig. 7 ) is ground away and the flat processing of the entire periphery of the lens is completed.
  • the above-described flat processing performed in two stages makes it possible to increase the thickness of lenses that can be flat finished without the need for increasing the width of the flat-processing portion 161 b of the flat-finishing tool.
  • the flat-processing portion 161b is tapered (i.e., has an inclination angle ⁇ r)
  • polishing processing is performed by the polishing grindstone 163 after flat processing by the normal finishing grindstone 161. Also in the polishing processing, if there is a portion where edge thickness values Tn are larger than a threshold value, a plural-stage control is performed in the same manner as in the flat processing by the normal finishing grindstone 161. That is, the control unit 50 divides a flat polishing process into plural stages.
  • the control unit 50 determines processing positions (the lens edge is shifted in the X direction with respect to the flat polishing portion 163b) on the basis of front surface edge positions Lcf and/or rear surface edge positions Lcr so that a lens portion that has not been flat polished will be processed.
  • the control unit 50 causes the flat polishing portion 163b to perform flat polishing on the periphery of the lens in plural stages by controlling the moving unit 130 and 140. If flat processing was performed in two stages in the above-described manner before the polishing processing, the control unit 50 also divides the flat polishing process into two stages.
  • the control unit 50 calculates X position control data of processing positions in the X direction corresponding to the respective lens rotation angles so that the front surface edges of the lens fall within the width of the V groove 163v for beveling and the rear surface edges of the lens fall within the width of the flat-processing portion 163b, and causes the flat-processing portion 163b to perform flat polishing on the periphery of the lens by controlling the X-direction moving unit 130 on the basis of the calculated X position control data.
  • the control unit 50 calculates X position control data of processing positions in the X direction corresponding to the respective lens rotation angles so that the front surface edges of the lens fall within the width of the flat-processing portion 163b, and causes the flat-processing portion 163b to perform flat polishing on the periphery of the lens by controlling the X-direction moving unit 130 on the basis of the calculated X position control data.
  • the polishing processing it becomes possible to increase the thickness of lenses that can be flat polished without the need for increasing the width of the flat-processing portion 163b of the polishing tool.
  • the control unit 50 judges whether or not edge thickness values Tn are larger than a threshold value TS2 that is lager than the threshold value TS1 and is determined on the basis of the width of the flat-processing portion 161 b and the width of the V groove 161 v.
  • edge thickness values Tn are larger than the threshold value TS2
  • the control unit 50 stops processing the periphery of the lens and display, on the screen 500 of the display 5, a warning to the effect that flat processing is impossible.
  • the display 5 thus functions as a warning device. This allows the operator to recognize in advance that the lens is so thick that this apparatus cannot perform automatic flat processing on it. Meaningless trouble can thus be avoided.
  • the thickness of lenses that can be flat finished can be increased further if the flat-processing portion 161 b and the front foot processing portion 161a of the normal finishing grindstone 161 are not tapered and are parallel with the lens chuck shafts 1112L and 112R (the flat-processing portion 161 b and the front foot processing portion 161a are cylindrical and have the sane diameter).
  • the polishing grindstone 163 More specifically, as shown in Fig. 9A , flat finishing of the first stage is performed in such a manner that the rear surface edge is located at the position 161 bP2 of the flat-processing portion 161 b.
  • the front surface edges are located on the left of the V groove 161v and the front foot processing portion 161a.
  • flat finishing is performed in such a manner that the front surface edge is located at the position 161bP1 of the flat-processing portion 161 b. In this manner, a portion that was left unprocessed by the flat finishing of the first stage is flat finished at the second stage.
  • the maximum diameter of the other processing tools such as the high-curvature bevel finishing grindstone 165 and the roughing grindstone 167 which are concentric with the normal finishing grindstone 161 and the polishing grindstone 163 is smaller than the diameter of the flat-processing portion 161 b and the front foot processing portion 161a. If the diameter of the polishing grindstone 163 which is located on the rear side of the flat-processing portion 161b is smaller than that of the flat-processing portion 161b, at the second stage the polishing grindstone 163 is prevented from affecting an edge portion that is located on the rear side of the rear end of the flat-processing portion 161b.
  • a process of the flat-finishing may be divided into more than two stages. And the lens edge may be shifted successively at those stages so that a portion that was left unprocessed by flat finishing of the first two stages is flat finished successively. In this manner, the thickness of lenses that can be flat finished can be increased.
  • X position control data corresponding to respective lens rotation angles may be calculated so that the rear surface edges are located at the processing position 161bP2.
  • a bevel portion Lv is formed only in a radius vector angle range where the front surface end position Lcf is located on the front side of the front end 161 bf of the flat-processing portion 161b.
  • the lens position in the X direction is varied to a larger extent when the rear surface edges are fixed than when the front surface ends are fixed.
  • the processing of the first stage and the processing of the second stage may be performed in order that is opposite to the order of the above-described embodiment.
  • the polishing grindstone 163 is not disposed behind the normal finishing grindstone 161 or the diameter of the former is smaller than the diameter of the latter, there does not occur a phenomenon that flat finishing is affected by processing of an edge portion located on the rear side of the normal finishing grindstone 161 by the polishing grindstone 163.
  • the diameter of the grindstone (processing tool) disposed immediately behind the polishing grindstone 163 is smaller than that of the polishing grindstone 163, there does not occur a phenomenon that polishing is affected by processing by the grindstone disposed immediately behind the polishing grindstone 163.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
EP12004145.4A 2011-05-31 2012-05-30 Vorrichtung zum Bearbeiten von Brillengläsern Withdrawn EP2529885A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2011122840A JP2012250297A (ja) 2011-05-31 2011-05-31 眼鏡レンズ加工装置

Publications (2)

Publication Number Publication Date
EP2529885A2 true EP2529885A2 (de) 2012-12-05
EP2529885A3 EP2529885A3 (de) 2014-08-13

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JP (1) JP2012250297A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2835215A1 (de) * 2013-06-28 2015-02-11 Nidek Co., Ltd. Vorrichtung, Verfahren und Programm zur Bearbeitung von Augengläsern
EP3225358A1 (de) * 2016-03-28 2017-10-04 Nidek co., Ltd. Brillenglasverarbeitungsvorrichtung und brillenglasverarbeitungsprogramm

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6244788B2 (ja) * 2013-09-30 2017-12-13 株式会社ニデック 眼鏡レンズ加工装置
CN113211235A (zh) * 2021-05-10 2021-08-06 山西光兴光电科技有限公司 研磨设备以及研磨方法

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Publication number Priority date Publication date Assignee Title
JPH0493164A (ja) 1990-08-09 1992-03-25 Nidek Co Ltd 眼鏡レンズ研削加工機
JP2008254077A (ja) 2007-03-30 2008-10-23 Nidek Co Ltd 眼鏡レンズ加工装置
JP2010280018A (ja) 2009-06-03 2010-12-16 Nidek Co Ltd 眼鏡レンズの鏡面加工条件設定方法及び眼鏡レンズ加工装置

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JPH0623661A (ja) * 1992-07-06 1994-02-01 Nikon Corp レンズ研削装置
JPH09225799A (ja) * 1996-02-21 1997-09-02 Hoya Corp 縁摺り加工装置の加工方式
JP2000108001A (ja) * 1998-10-02 2000-04-18 Topcon Corp レンズ研削装置
US6328630B1 (en) * 1998-10-05 2001-12-11 Hoya Corporation Eyeglass lens end face machining method
JP3892182B2 (ja) * 1998-10-06 2007-03-14 Ｈｏｙａ株式会社 眼鏡レンズの端面加工方法
JP2001179583A (ja) * 1999-12-27 2001-07-03 Topcon Corp レンズ加工情報処理方法及びそのための装置並びにその処理方法を用いたレンズ研削加工方法及びそのための装置

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JPH0493164A (ja) 1990-08-09 1992-03-25 Nidek Co Ltd 眼鏡レンズ研削加工機
JP2008254077A (ja) 2007-03-30 2008-10-23 Nidek Co Ltd 眼鏡レンズ加工装置
JP2010280018A (ja) 2009-06-03 2010-12-16 Nidek Co Ltd 眼鏡レンズの鏡面加工条件設定方法及び眼鏡レンズ加工装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2835215A1 (de) * 2013-06-28 2015-02-11 Nidek Co., Ltd. Vorrichtung, Verfahren und Programm zur Bearbeitung von Augengläsern
US10377011B2 (en) 2013-06-28 2019-08-13 Nidek Co., Ltd. Eyeglass lens processing apparatus and eyeglass lens processing program
EP3225358A1 (de) * 2016-03-28 2017-10-04 Nidek co., Ltd. Brillenglasverarbeitungsvorrichtung und brillenglasverarbeitungsprogramm
US10459423B2 (en) 2016-03-28 2019-10-29 Nidek Co., Ltd. Eyeglass lens processing apparatus and eyeglass lens processing program

Also Published As

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JP2012250297A (ja) 2012-12-20
EP2529885A3 (de) 2014-08-13

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