EP1249307A2 - Torisches Werkzeug zum Polieren einer optischen Fläche einer atorischen Linse und Polierverfahren mit einem solchen Werkzeug - Google Patents

Torisches Werkzeug zum Polieren einer optischen Fläche einer atorischen Linse und Polierverfahren mit einem solchen Werkzeug Download PDF

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Publication number
EP1249307A2
EP1249307A2 EP02290853A EP02290853A EP1249307A2 EP 1249307 A2 EP1249307 A2 EP 1249307A2 EP 02290853 A EP02290853 A EP 02290853A EP 02290853 A EP02290853 A EP 02290853A EP 1249307 A2 EP1249307 A2 EP 1249307A2
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EP
European Patent Office
Prior art keywords
polishing
lens
tool
value
curvatures
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.)
Granted
Application number
EP02290853A
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English (en)
French (fr)
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EP1249307B1 (de
EP1249307A3 (de
Inventor
Joel Bernard
Christophe Jeannin
Joel Huguet
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.)
EssilorLuxottica SA
Original Assignee
Essilor International Compagnie Generale dOptique SA
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Essilor International Compagnie Generale dOptique SA filed Critical Essilor International Compagnie Generale dOptique SA
Publication of EP1249307A2 publication Critical patent/EP1249307A2/de
Publication of EP1249307A3 publication Critical patent/EP1249307A3/de
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Publication of EP1249307B1 publication Critical patent/EP1249307B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/01—Specific tools, e.g. bowl-like; Production, dressing or fastening of these tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/16—Bushings; Mountings

Definitions

  • the invention relates to the polishing of optical surfaces.
  • a lens for example an ophthalmic lens, includes two opposite optical surfaces, connected by a slice generally inscribed in a cylinder with a circular base.
  • a torus T of which only a portion is represented, is obtained by revolution of a circle of radius R2, around an axis A1 located in the plane of said circle.
  • the point on the circle furthest from the axis A1 describes a circle with radius R1.
  • the rays R1 and R2 are respectively called large radius and small radius of the torus T.
  • R1 is strictly greater than R2.
  • the circles of radii R1 and R2 are located respectively in a plane P1 perpendicular to the axis A1, and in a plane P2 containing the axis A1, the planes P1 and P2 being intersecting in a straight line A2.
  • a cylinder with axis A2 and radius R3 (here strictly less than the radius R2), cut the torus T into a curve C delimiting a toric surface S, which has two plane symmetries: one with respect to the plane P1, the other with respect to at plane P2.
  • intersection of the toric surface S with the plane P1 is an arc of a circle of radius R1, called the great meridian M1 of the toric surface S, while the intersection of the toric surface S with the plane P2 is an arc of a circle radius R2, called the small meridian M2 of the toric surface S.
  • the large meridian M1 has a curvature C1 whose value is equal unlike the large radius R1, while the small meridian M2 has a curvature C2 whose value is equal to the inverse of the small radius R2.
  • a given surface is atoric if it exists a toric surface whose deviation at any point from said surface atoric value is lower, in absolute value, than a chosen value.
  • this value equal to 0.2 mm on a diameter of 80 mm, but it may be slightly different without departing from the scope of the invention.
  • a polishing step After the roughing of such an atoric surface, obtained by machining, a polishing step, possibly preceded by a smoothing step, aims to reduce the roughness of the already roughed surface.
  • Polishing is a delicate step, because it involves reducing the roughness of the surface without distorting it.
  • Polishing an optical surface with symmetry of revolution can be carried out using a tool comprising a polishing surface having a shape complementary to that of the surface optical, the tool and / or the lens being driven in rotation around the axis of symmetry of the optical surface, so that the polishing surface rubs against the optical surface.
  • the curvature of a spherical surface for the base substrate, the limb elastic and the surface member, is identical to a spherical surface whose working surface of a lens having an aspherical surface, is a approximation.
  • the lens is rotated, and, simultaneously, the tool is driven so as to be pressed against the surface of job.
  • the tool being of small dimensions compared to the lens, it is necessary provide complex kinematics so that the tool scans the entire work surface. This process is long and complex.
  • the tool will tend to distort the lens surface to give it at least locally its own spherical shape, and is therefore difficult to apply to toric or atoric surfaces.
  • the invention aims to provide a polishing tool, as well as a method of polishing employing this tool, which allow to polish an atoric surface to the times quickly and uniformly, while respecting precision constraints mentioned above.
  • machining of lenses made of mineral glass requires removal more important than machining glass lenses organic and causes the appearance of subsurface micro-cracks which, to disappear, require a longer polishing time, which results distortions and inaccuracies in the final shape of the lens surface.
  • the invention will therefore preferably apply to lenses made of organic glass, which does not have the aforementioned drawbacks of mineral glass.
  • the tool and the surface to be polished are moved relative to each other to the other in two movements in two perpendicular directions which each follow one of the meridians of the polishing surface.
  • the tool just described is applied to polishing a surface atoric optics of a lens such as an ophthalmic lens, made of preferably in organic glass.
  • the lens comprising a circular slice having a given diameter
  • the tool preferably has a circular section whose diameter is greater than the diameter of the lens edge.
  • the second correction ⁇ C2 is for example between 0 and 0.8 m -1 , preferably between 0.1 m -1 and 0.64 m -1 , for example equal to 0.37 m -1 .
  • step a) the determination of the best torus is carried out from preferably using the least squares mathematical method.
  • step a) the determination of the best torus is made for only part of the atoric surface of the lens, this part having a circular circumference, coaxial with the edge of The lens.
  • the implementation of the invention makes it possible to polish quickly and effectively an atoric optical surface without deforming it. Buffer, compressible, ensures permanent contact between the polisher and the surface atoric of the lens.
  • an ophthalmic lens 1 made of preferably in organic glass and comprising two optical surfaces: one convex spherical surface 2 having an axis A of revolution, as well as a surface 3 concave, atoric, opposite to the convex surface 2, surfaces 2 and 3 being connected by a section 4 inscribed in a cylinder of axis A and of diameter ⁇ 2 called the diameter of lens 1.
  • the diameter ⁇ 2 is between 60 mm and 80 mm.
  • the axis A of the lens meets the optical surface 3 at a point SL called top of the optical surface 3.
  • the optical surface 3, rough of machining, has a roughness which is wishes to decrease in order to give it an acceptable surface finish, without however, distort it.
  • the tool 5 is delimited radially by a cylindrical surface 15 of axis A 'and of diameter ⁇ O, called tool diameter 5.
  • the polisher 10 which also has a thickness e P also uniform, comprises a first surface 13 adhering to the second surface 12 of the pad 9, as well as a second surface 14 opposite the first 13, this polishing surface 14, called polishing surface, being able to polish the optical surface 3 by rubbing against it.
  • the pad 9, the thickness e T of which is for example between 4 mm and 6 mm, is made of a material whose rate of deformation under a pressure of 0.04 Mpa is greater than 5% .
  • the pad 9 can be made of an elastomeric material or, preferably in polyurethane foam.
  • the polisher 10 the thickness e P of which is for example between 0.5 mm and 1.1 mm, is itself made of fabric, felt or, according to a preferred embodiment, of polyurethane foam.
  • the polisher 10 is deformable so as to be able to follow the shape of the optical surface 3 of the lens 1 thanks to the compressibility of the pad 9.
  • the pad 9 and the polisher 10 are for example successively bonded or overmolded on the support surface 8, so that the second surfaces 12 and 14 of pad 9 and polisher 10 conform to the shape of the support surface 8, to the thickness of the pad 9 and the polisher 10 close.
  • the polishing surface 14 has two plane symmetries: one with respect to a plane P1 containing the axis A ', and the other by with respect to a plane P2 also containing the axis A 'and perpendicular to the plane P1.
  • the polishing surface 14, toric has two main meridians M1 and M2, defined respectively by the intersection of the polishing surface 14 with the plane of symmetry P1, and with the plane of symmetry P2.
  • the main meridians M1 and M2, which are arcs of a circle, are intersecting on the axis A 'at a point SO called the apex of the polishing surface 14.
  • the meridian M1 which has a curvature C1 is the great meridian of the polishing surface 14, while the meridian M2, which has a curvature C2, is its small meridian, so that the value of the curvature C1 is strictly less than the value of the curvature C2.
  • the choice of tool 5, i.e. the choice of polishing surface 14, is depending on the shape of the optical surface 3.
  • the thicknesses e T and e P of the pad 9 and of the polisher 10 being chosen to be uniform, it is understood that it is necessary, for the manufacture of the tool 5, to produce a support surface 8 of toroidal shape which corresponds to the thicknesses e T and e P close to the polishing surface 14.
  • the support surface 8 also has two plane symmetries, one with respect to the plane P1, and the other with respect to the plane P2.
  • the support surface 8 has two main meridians MS1 and MS2, concentric with the meridians M1 and M2 respectively of the surface of polishing, and defined by the intersection of the support surface 8 with, respectively, the plane P1 and the plane P2.
  • the meridian MS1 which is the large meridian of the support surface 8, has a curvature CS1
  • the meridian MS2, which is the small meridian of the support surface 8 has a curvature CS2.
  • two toric surfaces are defined beforehand, one called the best torus, the other called the reference torus, which depend respectively directly and indirectly from the optical surface 3 of the lens 1.
  • the best torus is a toric surface approximated to the optical surface 3, its determination being carried out for example by means of the method least squares mathematics, from a selection of values of geometric characteristics of the optical surface 3, chosen or measured on only part of the lens 1, this part having a circumference circular of diameter ⁇ 1, coaxial with edge 4 of lens 1.
  • the diameter ⁇ 1, called the calculation diameter is chosen equal to or substantially equal to 60 mm.
  • the best torus has two plane symmetries: one with respect to a plane PL1, the other with respect to a plane PL2 perpendicular to the plane PL1.
  • the best torus has two main meridians M * 1 and M * 2, defined by the intersection of the best torus with, respectively, the first and the second planes of symmetry PL1, PL2.
  • the main meridian M * 1, which presents a curvature C * 1, is the great meridian of the best torus
  • the meridian M * 2, which has a curvature C * 2 is the small meridian of the best torus, of so that the value of the curvature C * 1 is strictly less than the value of the curvature C * 2.
  • the reference toroid is the toric surface corresponding to the ophthalmic prescription for which the optical surface 3 is produced.
  • the reference toroid is a toric surface which, if it was substituted for the atoric surface 3 of the lens 1, providing at a point chosen from it the same prescription value as the atoric surface 3.
  • Said point chosen is generally the point of preference of the prism, commonly known as PRP, well known to those skilled in the art.
  • the reference torus includes two main circular meridians having respective curvatures C'1, C'2.
  • the large meridians M * 1, M'1 of the best torus and the reference torus are represented in FIG. 4, superimposed on the atoric optical surface 3 of the lens 1, in the plane PL1.
  • the value of the parameter a, expressed in m -1 is between 0 and 4, and preferably between 0.2 and 3.4.
  • parameter b without unit, is between 0.01 and 0.3, and preferably between 0.05 and 0.25.
  • parameter c also without unit, is between -2 and -0.01, and preferably between -1.5 and 0.1.
  • the value of the parameter d, expressed in m -2 , with ⁇ 2 expressed in m, is between -100 and 0, and preferably between -60 and -2.
  • the value of the second correction ⁇ C2, also expressed in m -1 is for example between 0 and 0.8, and preferably between 0.1 and 0.64. According to one embodiment, the value of the second correction ⁇ C2 is equal to or substantially equal to 0.37 m -1 .
  • the diameter ⁇ O of the tool 5 is chosen to be greater than the diameter ⁇ 2 of the lens 1.
  • the value of the diameter ⁇ O of the tool 5 is for example chosen equal or substantially equal to 110 mm.
  • the tool 5 is used to polish the atoric optical surface 3.
  • the tool 5 Prior to its use, the tool 5 is placed opposite and at distance from the optical surface 3 so that the axis A ', the plane of symmetry P1 and the plane of symmetry P2 of the tool 5 respectively coincide with the axis A of the lens 1, the plane of symmetry PL1, and the plane of symmetry PL2.
  • Tool 5 and lens 1 are then moved towards each other until that the polishing surface 14 comes into contact with the optical surface 3 of the lens 1, without the buffer 9 being compressed.
  • the polishing surface 14 is in point contact with the optical surface 3, with their respective vertices SO and SL in coincidence.
  • the tool 5 and the lens 1 are then moved relative to each other according to two separate reciprocating rotary movements, which can be combined to obtain a scrambling effect ensuring good quality of polishing.
  • the first movement is a plane rotation in the plane P1 of the large meridian M1 of the polishing surface 14, rotation whose center coincides with the center of curvature of this M1 meridian.
  • the second movement is a plane rotation in the P2 plane of the small meridian M2 of the polishing surface 14, rotation whose center coincides with the center of curvature of this M2 meridian.
  • the atoric optical surface 3 is never discovered during polishing.
  • the choice of the diameter ⁇ O of the tool 5, greater than the diameter ⁇ 2 of lens 1 allows rapid polishing.
  • Such a determination unit 18 can be integrated into a determination unit digital control 29 of a polishing installation 30 adapted to the polishing of ophthalmic lenses and suitable for carrying out the process described above.
  • This installation 30 further comprises a lens support 31 where the latter is temporarily subject to polishing.
  • the installation 30 also includes a tool holder 32 on which is mounted the tool 5, as well as means 33 for creating a relative movement of the lens support 31 and the tool holder 32, as described above, these means 33 being connected to the digital control unit 29.
  • the lens support 31 is fixed, only the tool holder 32 then being set in motion.
  • the support surface 8 is chosen to be spherical, while the thicknesses e T and e P of the pad 9 and of the polisher 10 are chosen to be non-uniform in order to obtain, when they are superimposed on the support surface 8, a toroidal polishing surface 14 whose values of the curvatures C1, C2 are in accordance with the calculated values.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
EP02290853A 2001-04-10 2002-04-05 Torisches Werkzeug zum Polieren einer optischen Fläche einer atorischen Linse und Polierverfahren mit einem solchen Werkzeug Expired - Lifetime EP1249307B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0104872A FR2823143B1 (fr) 2001-04-10 2001-04-10 Outil torique de polissage d'une surface optique d'une lentille, et procede de polissage d'une surface atorique au moyen d'un tel outil
FR0104872 2001-04-10

Publications (3)

Publication Number Publication Date
EP1249307A2 true EP1249307A2 (de) 2002-10-16
EP1249307A3 EP1249307A3 (de) 2002-12-04
EP1249307B1 EP1249307B1 (de) 2005-02-02

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ID=8862162

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02290853A Expired - Lifetime EP1249307B1 (de) 2001-04-10 2002-04-05 Torisches Werkzeug zum Polieren einer optischen Fläche einer atorischen Linse und Polierverfahren mit einem solchen Werkzeug

Country Status (6)

Country Link
US (1) US6814650B2 (de)
EP (1) EP1249307B1 (de)
AT (1) ATE288339T1 (de)
DE (1) DE60202804T2 (de)
ES (1) ES2236455T3 (de)
FR (1) FR2823143B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005010583A1 (de) * 2005-03-04 2006-09-07 Satisloh Gmbh Polierteller für ein Werkzeug zur Feinbearbeitung von optisch wirksamen Flächen an insbesondere Brillengläsern
EP2143527A1 (de) * 2008-07-08 2010-01-13 Indo Internacional, S.A. Werkzeug zur Reinigung konventioneller und frei geformter optischer Oberflächen
DE102014206424A1 (de) 2014-04-03 2015-10-08 Carl Zeiss Vision International Gmbh Polierwerkzeug sowie Vorrichtung und Verfahren zur formfehleroptimierten Polierbearbeitung von Brillenlinsenoberflächen und Gießformschalen zur Brillenlinsenherstellung

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004003131A1 (de) * 2004-01-15 2005-08-11 Carl Zeiss Vorrichtung und Verfahren zum Polieren einer optischen Fläche, optisches Bauelement, sowie Verfahren zum Herstellen eines Polierwerkzeugs
EP1762337A4 (de) * 2004-06-30 2009-11-25 Hoya Corp Verfahren zur herstellung von brillenglas
ES2249990B1 (es) * 2004-08-03 2007-08-01 Indo Internacional S.A. Herramienta y procedimiento para pulir superficies opticas.
EP2031435B1 (de) * 2007-12-28 2019-02-27 Essilor International Verfahren zur bestimmung eines konturendatensatzes einer brillenfassung
CN102990491A (zh) * 2012-11-29 2013-03-27 江苏宜达光电科技有限公司 球面玻璃的研磨治具
CN103481155A (zh) * 2013-08-23 2014-01-01 中国航天科工集团第三研究院第八三五八研究所 一种Si非球面透镜的数控加工方法
DE102016006741A1 (de) 2016-06-06 2017-12-07 Schneider Gmbh & Co. Kg Werkzeug, Vorrichtung und Verfahren zum Polieren von Linsen
EP3272457B1 (de) * 2016-07-21 2019-03-27 Delamare Sovra Verfahren zur serienherstellung von polierwerkzeugen für optische qualität
EP3272458B1 (de) * 2016-07-21 2019-03-27 Delamare Sovra Verfahren zur serienherstellung von polierwerkzeugen für optische qualität
EP3272456B1 (de) * 2016-07-21 2019-03-13 Delamare Sovra Verfahren zur serienherstellung von polierwerkzeugen für optische qualität
EP3800008A1 (de) 2019-10-02 2021-04-07 Optikron GmbH Vorrichtung und verfahren zum schleifen und/oder polieren planer flächen von werkstücken

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JPH0379260A (ja) * 1989-08-18 1991-04-04 Olympus Optical Co Ltd 自由曲面用研磨工具
JPH09239666A (ja) * 1996-03-06 1997-09-16 Nikon Corp スム−ジング工具

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US3583111A (en) * 1966-08-22 1971-06-08 David Volk Lens grinding apparatus
JPS61214965A (ja) * 1985-03-19 1986-09-24 Canon Inc 弾性研摩工具
JPH0379260A (ja) * 1989-08-18 1991-04-04 Olympus Optical Co Ltd 自由曲面用研磨工具
JPH09239666A (ja) * 1996-03-06 1997-09-16 Nikon Corp スム−ジング工具

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005010583A1 (de) * 2005-03-04 2006-09-07 Satisloh Gmbh Polierteller für ein Werkzeug zur Feinbearbeitung von optisch wirksamen Flächen an insbesondere Brillengläsern
EP2143527A1 (de) * 2008-07-08 2010-01-13 Indo Internacional, S.A. Werkzeug zur Reinigung konventioneller und frei geformter optischer Oberflächen
DE102014206424A1 (de) 2014-04-03 2015-10-08 Carl Zeiss Vision International Gmbh Polierwerkzeug sowie Vorrichtung und Verfahren zur formfehleroptimierten Polierbearbeitung von Brillenlinsenoberflächen und Gießformschalen zur Brillenlinsenherstellung
WO2015150201A1 (de) * 2014-04-03 2015-10-08 Carl Zeiss Vision International Gmbh POLIERWERKZEUG SOWIE VORRICHTUNG UND VERFAHREN ZUR FORMFEHLEROPTIMIERTEN POLIERBEARBEITUNG VON BRILLENLINSENOBERFLÄCHEN UND GIEßFORMSCHALEN ZUR BRILLENLINSENHERSTELLUNG
EP3126091B1 (de) 2014-04-03 2018-01-24 Carl Zeiss Vision International GmbH Polierwerkzeug sowie vorrichtung und verfahren zur formfehleroptimierten polierbearbeitung von brillenlinsenoberflächen und giessformschalen zur brillenlinsenherstellung

Also Published As

Publication number Publication date
ES2236455T3 (es) 2005-07-16
FR2823143A1 (fr) 2002-10-11
EP1249307B1 (de) 2005-02-02
FR2823143B1 (fr) 2003-07-04
EP1249307A3 (de) 2002-12-04
DE60202804D1 (de) 2005-03-10
DE60202804T2 (de) 2006-03-30
US6814650B2 (en) 2004-11-09
ATE288339T1 (de) 2005-02-15
US20030017783A1 (en) 2003-01-23

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