EP1773542A1 - Procede de rainage ou de contre-biseautage de la peripherie d'une lentille ophtalmique - Google Patents
Procede de rainage ou de contre-biseautage de la peripherie d'une lentille ophtalmiqueInfo
- Publication number
- EP1773542A1 EP1773542A1 EP05770868A EP05770868A EP1773542A1 EP 1773542 A1 EP1773542 A1 EP 1773542A1 EP 05770868 A EP05770868 A EP 05770868A EP 05770868 A EP05770868 A EP 05770868A EP 1773542 A1 EP1773542 A1 EP 1773542A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- axis
- counter
- lens
- angle
- profile
- 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- Withdrawn
Links
Classifications
-
- 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
-
- 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
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/22—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation
-
- 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
- B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
-
- 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
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/22—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation
- B24B47/225—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation for bevelling optical work, e.g. lenses
Definitions
- a method of creasing or counter-bevelling the periphery of an ophthalmic lens comprising: - a lens support, provided with means for driving the lens in rotation around a first axis; - a creasing or beveling grinding wheel mounted integral with a rotary drive shaft around a second axis; - means for relative positioning of the grooving or counter-beveling wheel along the first axis; and - means for adjusting the angle of inclination of the second axis relative to the first axis.
- EP 1 310 326 discloses a creasing process in a machine of the aforementioned type, in which a creasing profile determined on the periphery of an optical glass is chosen. According to this profile, creasing is carried out by modifying the angle of inclination of the creasing wheel for a large number of angular positions of the lens around the axis of rotation of this lens on its support.
- a groove of substantially uniform width is thus obtained, particularly in the case of lenses having a strong curvature and / or an angular shape, in particular square or rectangular.
- Such a process is not entirely satisfactory. Indeed, given the high number of angular positions of the lens around its axis of rotation, the implementation of the method requires a computer with high computing power and a precise and complex mechanism for dynamically adjusting the angle of inclination of the creasing wheel relative to the first axis.
- An object of the invention is to obtain a creasing or counter-beveling process for the periphery of an ophthalmic lens which makes it possible to obtain a groove or a counter-bevel of satisfactory aesthetic appearance and, in the case of '' a groove, a section profile satisfying to effectively retain a wire mounting the lens in its frame, this method being simple to implement.
- the subject of the invention is a method of the aforementioned type, characterized in that it comprises the following steps: - a groove or counter-bevel profile is determined; - a single processing angle corresponding to said profile is calculated; - the angle of inclination of the second axis relative to the first axis is adjusted to the value of the single processing angle; and - the groove or the counter-bevel is ground in the lens while keeping said angle of inclination constant.
- FIG. 1 is a partial schematic view in elevation of the relevant parts of a grinding machine for the implementation of the method according to the invention
- - Figure 2 is a schematic perspective view of a lens, during the various stages of the method according to the invention
- - Figure 3 is a side view of Figure 2, taken along arrow III.
- the grinding machine 1 1 shown in Figure 1 is intended to process or machine the periphery 13 of an ophthalmic lens 15 to perform creasing and / or counter-beveling operations, this lens 15 having been previously roughed by grinding peripheral.
- the machine 11 comprises a frame 17, a lens support 19, a tool holder assembly 21, means 23 for axial and radial relative positioning of the assembly 21 relative to the support 19, and a control unit 25.
- the support of lens 19 comprises a carriage 27 pivotally mounted on the frame 17, provided with two half-shafts 29A, 29B adapted to grip the lens 15, and a motor 31 for driving the lens 15 in rotation.
- the carriage 27 is articulated by relative to the frame 17, by a rear longitudinal edge 28, around an axis XX 'of substantially horizontal tilting.
- the two half-shafts 29A, 29B are mounted along the front longitudinal edge 32 of the carriage 27.
- the tool holder assembly 21 comprises a support 35, a link arm 37 projecting from the support 35, a tool holder shaft 39, a motor 41 for driving the rotation of the tool-holder shaft 39 and means 43 for tilting the tool-holder shaft 39 relative to the support 35.
- the link arm 37 is articulated by a first end 45 on the support 21, around a pivot axis horizontal BB 'substantially orthogonal to the first axis A-A'.
- the tool-holder shaft 39 is rotatably mounted at the free end 47 of the link arm, around a second axis CC substantially orthogonal to the link arm 37.
- the shaft 39 carries a grinding wheel 51 and a wheel 53 of bevelling.
- the tool-carrying shaft 39 also carries at its free end a drilling tool extending along the axis CC.
- the creasing wheel 51 is constituted by a thin cylindrical disc. In the example illustrated in Figure 1, the thickness of this disc is substantially constant and between 0.5 and 1.6 mm.
- the counter-bevel grinding wheel 53 has externally a cylindrical median surface framed by two frustoconical surfaces which converge away from this surface.
- the arm 37, and consequently the tool-holder shaft 39, is movable in rotation about the axis BB 'on an angular displacement of at least 30 ° and preferably 180 °, being able to take in particular an upper vertical position in which the second axis CC is substantially parallel to the first axis A-A ', and a plurality of tilt positions in which the second axis CC is inclined relative to the first axis A-A'.
- the tool-holder shaft 39 remains substantially in the vertical plane which passes through the first axis A-A ', whatever its position around the axis B-B'.
- the motor 41 for driving in rotation the tool-holder shaft 39 is fixed on the link arm 37. It is connected to the shaft 39 by transmission means 55 arranged in the link arm 37.
- the means for adjustment 43 of the angle of inclination of the tool-holder shaft 39 comprise a motor 61 for actuating an endless screw 63, and a tangent toothed wheel 65, mounted integral with the link arm 37.
- the screw without end 63 extends in a direction substantially parallel to the first axis A-A '.
- the toothed wheel 65 is fixed on the arm 37 at its free end 45.
- the means 23 for axial and radial relative positioning of the tool holder assembly 21 with respect to the lens support 19 for example comprise means 71 for tilting the carriage 27 around its axis of tilt X-
- the control unit 25 controls on the one hand, the movement of the tool holder assembly 21 along the axis DD 'and on the other hand, the movement of the carriage 19 around the axis XX' . This latter movement can be compared to a pseudo-translation movement along an axis perpendicular to the first axis AA ′.
- the control unit 25 also controls the axial and radial positioning means 23 to selectively position the grinding wheels 51, 53 in contact with the periphery 13 of the lens 15.
- the control unit 25 is connected to the actuating motor 61 tilt means 43 for controlling the rotation of the worm screw 63 in a first direction or in the direction opposite to the first direction, in order to adjust the inclination of the second axis CC relative to the first axis A-A '.
- the control unit 25 is connected to a computer 77 which makes it possible to calculate a single angle of crease inclination or of bevelling, as will be described below. An example of a creasing method according to the invention will now be described with reference to FIGS. 2 and 3.
- This method comprises a step 101 of choosing the groove profile, a step 103 of calculating a single processing angle corresponding to this groove profile, a step 105 for adjusting the angle of inclination of the creasing wheel relative to the rough lens, and a step 107 for grinding the groove.
- the rough lens 15 which has its final outline, is wedged between the two ends 33A, 33B of the half-shafts 29A, 29B by an adapter suitably positioned on this lens 15.
- the optician chooses a determined groove profile 109 by selecting the position of the groove on the periphery 13, for a number of points 111 chosen around the axis AA 'of the lens 15.
- Each point 111 corresponds to an angular position of the lens 15 around the first axis A-A'.
- This number of points 111 is for example between 128 and 1024 and in particular equal to 512.
- the profile 109 of the groove depends in particular on the shape of the lens and on the frame chosen for this lens. This profile 109 is substantially inscribed on a sphere of center 121.
- the computer 77 calculates a unique processing angle ⁇ 0 as a function of increasing the mean radius of curvature R c m0 y of the profile 109. At this Indeed, the computer 77 advantageously determines the mean deflection f m0 y of the profile 109 by the formula:
- f (i) is the arrow of the profile 109 at the point ⁇ corresponding to a given angular position of the lens 15 and N is the number of points 111 chosen defining the profile 109.
- the arrow f (i) is calculated, as illustrated by FIG. 3, by the distance which separates on the one hand, the orthogonal projection 115 from the point [on the axis AA 'of the lens, and on the other hand, the point of intersection 117 of the axis AA' and of the sphere 119 which passes through the point i and which is centered at the aforementioned center 121.
- the single ⁇ 0 treatment angle is also calculated in increasing function of the average basis ⁇ m0 y of the profile 109.
- the average base ⁇ avg is calculated by the formula:
- the single treatment angle ⁇ 0 is an increasing function of the product of the average base ⁇ avg and the average radius of curvature r ⁇ c av-
- the actuation motor 61 is actuated to drive the worm 63 in rotation and consequently the arm of support 37 until the angle ⁇ formed by the first axis AA 'and the second axis CC is equal to the single processing angle ⁇ o.
- the creasing wheel 51 is brought into contact with the periphery 13 of the lens 15 by the displacement means 23.
- the motor 31 for driving the lens 15 in rotation is then actuated, and a groove 131 is formed on the periphery 13 of the lens 15, along the profile 109.
- the inclination of the second axis CC with respect to the first axis AA ' is kept constant and equal to the single processing angle ⁇ 0 , whatever the angular position of the lens 15 around the first axis A-A'.
- the treatment angles ⁇ 0 calculated by formula (4) make it possible to obtain, for each lens 15 considered, a groove 131 which has an aesthetic appearance and a profile in satisfactory section to effectively retain a mounting wire of the lens in its mount.
- the calculation shows that the processing angle ⁇ o is an increasing function of the average base ⁇ m0 y of the profile 109 and of the mean deflection fmoy of this profile 109.
- the angle ⁇ o is thus preferably between 0 ° and 30 °.
- the angle of inclination ⁇ of the second axis CC relative to the first axis AA 'being kept constant throughout the creasing step 107, the means for adjusting this angle of inclination ⁇ are simplified.
- the grinding wheel used is the grinding wheel 53 for counter-beveling.
- the determined profile of the bevel is imposed by the layout peripheral edges 133 and 135 of the lens.
- the grinding machine 11 further comprises a train of grinding wheels comprising for example a roughing wheel, a finishing wheel with beveling and a polishing wheel with beveling. Such a machine is described for example in French application No. 03 03 792.
- the method then further comprises a step of roughing out the lens, before the step of grinding the groove or the counter-bevel.
- the method according to the invention does not require a computer having a high computing power, nor complex means for controlling the angle of inclination of the creasing wheel 51 or against beveling 53 relative to the lens. 15.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0405427A FR2870471B1 (fr) | 2004-05-18 | 2004-05-18 | Procede de rainage ou de contre-biseautage de la peripherie d'une lentille ophtalmique |
PCT/FR2005/001190 WO2005123340A1 (fr) | 2004-05-18 | 2005-05-12 | Procede de rainage ou de contre-biseautage de la peripherie d'une lentille ophtalmique |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1773542A1 true EP1773542A1 (fr) | 2007-04-18 |
Family
ID=34946608
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05770868A Withdrawn EP1773542A1 (fr) | 2004-05-18 | 2005-05-12 | Procede de rainage ou de contre-biseautage de la peripherie d'une lentille ophtalmique |
Country Status (6)
Country | Link |
---|---|
US (1) | US7963824B2 (fr) |
EP (1) | EP1773542A1 (fr) |
KR (2) | KR100868815B1 (fr) |
CN (1) | CN100513079C (fr) |
FR (1) | FR2870471B1 (fr) |
WO (1) | WO2005123340A1 (fr) |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5148637A (en) * | 1990-02-27 | 1992-09-22 | Bausch & Lomb Incorporated | Lens edging system with programmable feed and speed control |
JP3011526B2 (ja) * | 1992-02-04 | 2000-02-21 | 株式会社ニデック | レンズ周縁加工機及びレンズ周縁加工方法 |
DE4208835A1 (de) * | 1992-03-19 | 1993-09-30 | Wernicke & Co Gmbh | Verfahren zum Formschleifen des Umfangs eines Brillenglases |
FR2728187A1 (fr) * | 1994-12-19 | 1996-06-21 | Essilor Int | Procede pour le reperage de la position du biseau ou de la rainure a usiner sur la tranche d'un verre de lunettes et machine a deborder permettant la mise en oeuvre de ce procede |
JP4011134B2 (ja) * | 1996-03-26 | 2007-11-21 | 株式会社ニデック | レンズ研削加工装置 |
JPH10249692A (ja) * | 1997-03-11 | 1998-09-22 | Nidek Co Ltd | レンズ研削加工装置、レンズ研削加工方法及びそのための部品 |
ES2304353T3 (es) * | 1999-08-06 | 2008-10-16 | Hoya Corporation | Dispositivo de fabricacion de lentes y metodo de fabricacion de lentes. |
JP2003145400A (ja) * | 2001-11-08 | 2003-05-20 | Nidek Co Ltd | 眼鏡レンズ加工装置 |
TW200302355A (en) * | 2002-01-18 | 2003-08-01 | Nippon Sheet Glass Co Ltd | Method for producing aspherical structure, and aspherical lens array molding tool and aspherical lens array produced by the same method |
JP2003300158A (ja) * | 2002-04-08 | 2003-10-21 | Hoya Corp | レンズ加工装置 |
FR2852878B1 (fr) * | 2003-03-27 | 2006-09-29 | Briot Int | Machine de meulage de verres optiques. |
US7740519B2 (en) * | 2003-04-16 | 2010-06-22 | Kabushiki Kaisha Topcon | Method for processing chamfering of eyeglass lens and apparatus for processing the same |
JP4873878B2 (ja) * | 2005-03-31 | 2012-02-08 | 株式会社ニデック | 眼鏡レンズ周縁加工装置 |
US7463944B2 (en) * | 2006-08-29 | 2008-12-09 | National Optronics | Method of grooving and drilling an ophthalmic lens blank, machine programmed therefor, and computer program |
-
2004
- 2004-05-18 FR FR0405427A patent/FR2870471B1/fr not_active Expired - Lifetime
-
2005
- 2005-05-12 US US11/579,912 patent/US7963824B2/en not_active Expired - Fee Related
- 2005-05-12 WO PCT/FR2005/001190 patent/WO2005123340A1/fr active Application Filing
- 2005-05-12 KR KR1020067026291A patent/KR100868815B1/ko not_active IP Right Cessation
- 2005-05-12 CN CNB2005800160090A patent/CN100513079C/zh not_active Expired - Fee Related
- 2005-05-12 EP EP05770868A patent/EP1773542A1/fr not_active Withdrawn
- 2005-05-12 KR KR1020087017350A patent/KR101024766B1/ko not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO2005123340A1 * |
Also Published As
Publication number | Publication date |
---|---|
KR20070024597A (ko) | 2007-03-02 |
CN1956818A (zh) | 2007-05-02 |
FR2870471B1 (fr) | 2006-08-25 |
KR20080070780A (ko) | 2008-07-30 |
US20070224921A1 (en) | 2007-09-27 |
KR100868815B1 (ko) | 2008-11-14 |
US7963824B2 (en) | 2011-06-21 |
KR101024766B1 (ko) | 2011-03-24 |
WO2005123340A1 (fr) | 2005-12-29 |
FR2870471A1 (fr) | 2005-11-25 |
CN100513079C (zh) | 2009-07-15 |
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