EP0286469B1 - An die Oberfläche einer ophthalmischen Linse selbstanpassendes Werkzeug - Google Patents

An die Oberfläche einer ophthalmischen Linse selbstanpassendes Werkzeug Download PDF

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Publication number
EP0286469B1
EP0286469B1 EP88400577A EP88400577A EP0286469B1 EP 0286469 B1 EP0286469 B1 EP 0286469B1 EP 88400577 A EP88400577 A EP 88400577A EP 88400577 A EP88400577 A EP 88400577A EP 0286469 B1 EP0286469 B1 EP 0286469B1
Authority
EP
European Patent Office
Prior art keywords
mould
component
cylindrical
membrane
per
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.)
Expired - Lifetime
Application number
EP88400577A
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English (en)
French (fr)
Other versions
EP0286469A1 (de
Inventor
Patrick Herbin
Jean-Claude Lacroix
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.)
Filing date
Publication date
Application filed by Essilor International Compagnie Generale dOptique SA filed Critical Essilor International Compagnie Generale dOptique SA
Priority to AT88400577T priority Critical patent/ATE57863T1/de
Publication of EP0286469A1 publication Critical patent/EP0286469A1/de
Application granted granted Critical
Publication of EP0286469B1 publication Critical patent/EP0286469B1/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
    • B24B13/005—Blocking means, chucks or the like; Alignment devices
    • B24B13/0052—Lens block moulding devices

Definitions

  • the present invention relates to a self-shaping tool on the surface of an ophthalmic lens, comprising a rigid support and a deformable pad mounted on the support.
  • known tools of the above-mentioned kind are usually used either as a polisher to polish or soften the surface of an ophthalmic lens, or as an applicator pad for applying an adhesive film to the surface of a lens. to protect it from scratches or against attacks by foreign bodies, for example during a so-called “blocking” or “gliding” operation of a lens (operation consisting in fixing a metal block on one face of the lens , by casting a metal with a low melting point, for the subsequent mounting of the lens on the lens holder of a planing machine, an overflowing machine or a machine for polishing ophthalmic lenses) .
  • the tool pad should be able to closely fit the entire surface of the lens against which it is applied.
  • the tool pad was necessary to have a set of tools, each adapted to a radius of curvature.
  • the present invention therefore aims to provide a single autoconformable tool, capable of closely matching the entire surface of an ophthalmic lens, with a substantially uniform contact pressure, regardless of the radius of curvature of the lens.
  • the tool of the present invention is characterized in that the support has a cavity in one of its faces, in that the pad consists of two elastically deformable membranes, fixed by their peripheral edge to the side walls from the cavity, at a distance from the bottom thereof, and defining between them a space which is filled with an incompressible material, in grains of small dimensions, and in that the support also comprises a passage, one end of which opens out in said space and the other end of which is connectable to a source of vacuum.
  • the granular material may for example be constituted by sand or by balls of small diameter.
  • the balls may for example have a diameter between 0.5mm and 3.5mm, preferably a diameter of 1mm.
  • the balls can be glass or metal.
  • the two membranes can be made of an elastomeric material, for example latex, and they can have, for example, a thickness of between 0.5 mm and 1 mm.
  • the tool shown in the drawing essentially consists of a deformable pad 1 carried by a rigid support 2.
  • the support 2 comprises a first element 2a, in the form of a cup, and two other elements 2b and 2c, in the form of a ring. , substantially the same diameter as the first element 2a.
  • the three elements 2a, 2b and 2c are fixed coaxially to each other for example by screws 3 and 4, and they together form a relatively deep cavity 5 in one of the faces of the support 2.
  • the support 2 comprises a means 6 allowing its connection to a tool holder, for example a boss pierced with a tapped blind hole as shown in the figure.
  • the deformable pad si is constituted by two membranes 7 and 8, made of latex, which are stretched across the cavity 5 and fixed by pinching, in their peripheral region, respectively between the elements 2a and 2b between the elements 2b and 2c of the support. 2.
  • the space 9 between the two membranes 7 and 8 is filled with balls 11 of small diameter, for example glass balls having a diameter of 1 mm.
  • the element 2b of the support 2 has a radial passage 12 which, on one side, opens into the space 9 and, on the other side, is connected by a connector 13 and by a pipe 14 to a vacuum source 15
  • a three-way valve 16 is inserted in the pipe 14 and makes it possible, depending on its position, to put the space 9 in communication either with the vacuum source 15 or with the atmosphere.
  • a filter 17, having a mesh size smaller than the diameter of the balls 11, is provided in the passage 12 to prevent the balls 11 from being drawn into the pipe 14 when the vacuum is established therein by the source 15 .
  • the element 2a of the support 2 also includes a passage 18 which, on one side, opens into the cavity 5 between the bottom of the latter and the membrane 7 and, on the other side, is connected by a connector 19 and a pipe 21 to a three-position valve 22.
  • the valve 22 makes it possible to put the pipe 21 in communication either with the atmosphere, or with the vacuum source 15 through a pipe 23, or even with a source of compressed air 24 through a pipe 25.
  • this allows the pad 1 to adapt more easily to the surface of the lens when the latter has a small radius of curvature or when the pad must be applied against a concave surface of a lens.
  • the operation of the tool will now be described by first assuming that it must be applied against the convex surface Si of the lens L.
  • the lens L is placed on a support 26. At least one of the two supports 2 and 26 is movable relative to the other in such a way that they can be moved towards and away from each other as indicated by the double arrow F.
  • the two pipes 14 and 21 being in communication with the atmosphere, the two supports 2 and 26 are brought together.
  • the lens L deforms the membrane 8 which then matches the convex face Si of the lens.
  • the valve 16 is switched so as to put the space 9 in communication with the vacuum source 15. This has the effect of completely stiffening the assembly 7,8,11 and the membrane 8 then perfectly retains the shape of the convex surface S 1 . It follows that the bearing force of the pad 1 on the surface Si is distributed uniformly over the whole of this surface.
  • the membrane 8 can be lined with a polishing material, such as for example felt.
  • the pipe 21 in communication with the vacuum source 15 through the valve 22 while the space 9 between the two membranes 7 and 8 is still in communication with the atmosphere. Then, the space 9 can be placed in communication with the vacuum source 15 by means of the valve 16 as described above to stiffen the assembly 7,8,11.
  • the space between the membrane 7 and the bottom of the cavity 5 can be brought into communication with the source of compressed air 24 through the pipe 21, the valve 22 and the pipe 25, to counterbalance the efforts of applying the lens L against the pad 1, in particular in the case where the tool is used as a surfacing or polishing tool.
  • the space between the membrane 7 and the bottom of the cavity 5 is first of all put in communication with the source of compressed air through the pipe 21, the valve 22 and the pipe 25 while the space 9 between the two membranes 7 and 8 is still in communication with the atmosphere, in order to push the assembly 7,8,11 against the concave surface of the lens. Then, when the membrane 8 has conformed to the concave surface of the lens, the space 9 is placed in communication with the vacuum source 15 through the pipe 14 and the valve 16 in order to stiffen the assembly 7,8,11 as previously.
  • the autoconformable tool for applying an adhesive film to an ophthalmic lens
  • said tool is essentially used as a "surface memory”.
  • the forces applied to the tool are low and the use of glass balls 11, which is a material with a low coefficient of friction, is sufficient.
  • the autoconformable tool in a use of the autoconformable tool as a surfacing tool, it is necessary to have a very rigid assembly to avoid deformation of the shape of the surface under the machining forces, and therefore to use balls or grains 11 having a high coefficient of friction (in the case of aluminum or steel).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Eyeglasses (AREA)
  • Prostheses (AREA)

Claims (10)

1. An die Oberfläche einer ophthalmischen Linse bzw. eines Brillenglases selbstanpassendes Werkzeug mit einer starren Abstützeinrichtung (2) und einer an der Abstützeinrichtung angebrachten, verformbaren Dämpf- bzw. Puffereinrichtung (1), dadurch gekennzeichnet, daß die Stützeinrichtung (2) einen Hohlraum (5) in einer ihrer Flächen umfaßt, daß die Puffereinrichtung (1) von zwei Membranen (7, 8) gebildet ist, die elastisch verformbar, mit ihrem Umfangsrand an Seitenwänden des Hohlraumes (5) in einem Abstand von dessen Bogen befestigt sind und zwischen sich einen Raum (9) definieren bzw. umgrenzen, der mit einem inkompressiblen Material (11) in Form von Körnern mit kleinen Durchmessern gefüllt ist, und daß die Stützeinrichtung (2) außerdem einen Durchgang (12) umfaßt, dessen eines Ende in dem Raum (g) endet und dessen anderes Ende an eine Vakuumquelle (15) anschließbar ist.
2. Selbstanpassendes Werkzeug nach Anspruch 1, dadurch gekennzeichnet, daß das inkompressible Material in Form von Körnern (11) von Kugeln gebildet ist, die einen Durchmesser zwischen 0,5 mm und 3,5 mm aufweisen.
3. Selbstanpassendes Werkzeug nach Anspruch 2, dadurch gekennzeichnet, daß die Kugeln (11) einen Durchmesser von 1 mm aufweisen.
4. Selbstanpassendes Werkzeug nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Kugeln (11) aus Glas oder aus Metall sind.
5. Selbstanpassendes Werkzeug nach Anspruch 1, dadurch gekennzeichnet, daß das inkompressible Material in Form von Körnern (11) von Sand gebildet ist.
6. Selbstanpassendes Werkzeug nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Membranen (7, 8) aus einem elastomeren Material bestehen.
7. Selbstanpassendes Werkzeug nach Anspruch 6, dadurch gekennzeichnet, daß die Membranen (7, 8) aus Latex bestehen.
8. Selbstanpassendes Werkzeug nach Anspruch 7, dadurch gekennzeichnet, daß die Membranen (7, 8) eine Dicke zwischen 0,5 mm und 1 mm aufweisen.
9. Selbstanpassendes Werkzeug nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Stützeinrichtung (2) einen weiteren Durchgang (18) umfaßt, dessen eines Ende in dem Hohlraum (5) zwischen dessen Boden und der Membran (7) nächst zum Boden mündet und dessen anderes Ende wahlweise an eine Vakuumquelle (15) oder eine Druckluftquelle (24) anschließbar ist.
10. Selbstanpassendes Werkzeug nach Anspruch 9, dadurch gekennzeichnet, daß die Stützeinrichtung (2) ein erstes Element (2a) in Form einer Kuppel bzw. einer Schale und zweite und dritte Elemente (2b, 2c) in Form eines Ringes mit im wesentlichen demselben Durchmesser wie das erste Element umfaßt, wobei die drei Elemente koaxial aneinander befestigt sind, daß eine (7) der zwei Membranen über seinen Umfangsrand zwischen dem ersten und zweiten Element (2a, 2b) und die andere Membran (8) mit seinem Umfangsrand zwischen dem zweiten und dritten Element (2b, 2c) eingeklemmt bzw. verspannt ist, und daß die zwei Durchgänge (12, 18) in dem ersten bzw. zweiten Element radial durchbrochen bzw. durchgebohrt sind.
EP88400577A 1987-03-27 1988-03-11 An die Oberfläche einer ophthalmischen Linse selbstanpassendes Werkzeug Expired - Lifetime EP0286469B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88400577T ATE57863T1 (de) 1987-03-27 1988-03-11 An die oberflaeche einer ophthalmischen linse selbstanpassendes werkzeug.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8704264 1987-03-27
FR8704264A FR2612823B1 (fr) 1987-03-27 1987-03-27 Outil a depression autoconformable a la surface d'une lentille ophtalmique et utilisable notamment comme tampon applicateur ou polissoir

Publications (2)

Publication Number Publication Date
EP0286469A1 EP0286469A1 (de) 1988-10-12
EP0286469B1 true EP0286469B1 (de) 1990-10-31

Family

ID=9349482

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88400577A Expired - Lifetime EP0286469B1 (de) 1987-03-27 1988-03-11 An die Oberfläche einer ophthalmischen Linse selbstanpassendes Werkzeug

Country Status (6)

Country Link
US (1) US4831789A (de)
EP (1) EP0286469B1 (de)
AT (1) ATE57863T1 (de)
DE (1) DE3860915D1 (de)
ES (1) ES2018078B3 (de)
FR (1) FR2612823B1 (de)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2654027B1 (fr) * 1989-11-06 1992-01-10 Essilor Int Outil de surfacage autoconformable.
EP0436315A3 (en) * 1990-01-03 1991-12-11 Pilkington Visioncare Inc. Injection moldable plastic laps
SE465507B (sv) * 1990-02-15 1991-09-23 Electrolux Ab Mothaall foer att stoedja en vaegg vid plastskumning samt saett att aastadkomma ett saadant mothaall
TW227540B (de) * 1992-06-15 1994-08-01 Philips Electronics Nv
DE4442181C1 (de) * 1994-11-26 1995-10-26 Loh Optikmaschinen Ag Werkzeug zur Feinbearbeitung optischer Flächen
DE19524084A1 (de) * 1995-07-01 1997-01-02 Bosch Gmbh Robert Handschleifwerkzeugmaschine und Schleifwerkzeug
US5762546A (en) * 1995-12-13 1998-06-09 Coburn Optical Industries, Inc. Pneumatically assisted conformal tool for an ophthalmic lens finer/polisher
US5927264A (en) * 1998-01-08 1999-07-27 Worley; Kenneth Extended wear stone polishing disk
FR2781174B1 (fr) 1998-07-20 2000-10-06 Essilor Int Outil de finissage, notamment pour lentille ophtalmique, et equipements propres a sa mise en oeuvre
US6875090B2 (en) * 1999-12-01 2005-04-05 Gerber Coburn Optical, Inc. Apparatus for finishing optical surfaces, including a pad compensation device
US6527632B1 (en) * 1999-12-01 2003-03-04 Gerber Coburn Optical, Inc. Lap having a layer conformable to curvatures of optical surfaces on lenses and a method for finishing optical surfaces
DE10026936A1 (de) * 2000-05-30 2001-12-06 Hilti Ag Schleifkörper
US6589102B2 (en) * 2001-01-30 2003-07-08 Larsen Equipment Design, Inc. Surface polishing method and apparatus
DE10106007B4 (de) * 2001-02-09 2007-06-14 Optotech Optikmaschinen Gmbh Vorrichtung zum Polieren von Linsen
US20050202754A1 (en) * 2003-05-16 2005-09-15 Bechtold Mike J. Method, apparatus, and tools for precision polishing of lenses and lens molds
FR2895293B1 (fr) * 2005-12-27 2008-02-01 Essilor Int Dispositif de blocage pour element optique.
EP3433052B1 (de) * 2016-03-24 2022-08-24 3M Innovative Properties Company Formbare vorrichtung
CN109571186A (zh) * 2019-01-02 2019-04-05 中国科学院上海光学精密机械研究所 板条元件端面加工固定装置
EP4714591A1 (de) * 2024-09-23 2026-03-25 werk5 GmbH Oberflächenbehandlungsvorrichtung, oberflächenbehandlungssystem, oberflächenbehandlungsverfahren und computerprogramm

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT76279B (de) * 1916-01-27 1919-04-25 Ingenieur Otto Herkt Aus verschiebbaren Spanngliedern bestehende Einspann-Vorrichtung für unregelmäßig geformte Gegenstände.
GB1245375A (en) * 1970-01-19 1971-09-08 Melvin Joseph Briggs Rotary abrasive device
BE795629A (fr) * 1972-02-18 1973-06-18 Lacrex Brevetti Sa Outil
SU511178A1 (ru) * 1973-01-30 1976-04-25 Предприятие П/Я М-5841 Электрод-инструмент
JPS5160629A (en) * 1974-11-22 1976-05-26 Mitsubishi Heavy Ind Ltd Genatsuzokeiigatano seisakuhoho
EP0169931A1 (de) * 1984-08-03 1986-02-05 Wilhelm Loh Wetzlar Optikmaschinen GmbH & Co. KG Aufnahmefutter für die Aufnahme von optischen Linsen und anderen optischen Bauelementen beim Feinschleifen und Polieren
JPS61257778A (ja) * 1985-05-02 1986-11-15 Nitto Electric Ind Co Ltd 表面仕上装置

Also Published As

Publication number Publication date
EP0286469A1 (de) 1988-10-12
FR2612823A1 (fr) 1988-09-30
ATE57863T1 (de) 1990-11-15
ES2018078B3 (es) 1991-03-16
DE3860915D1 (de) 1990-12-06
FR2612823B1 (fr) 1994-02-25
US4831789A (en) 1989-05-23

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