EP2384854A2 - Outil de polissage pour le traitement de surfaces optiques, notamment des surfaces de moulage libre - Google Patents

Outil de polissage pour le traitement de surfaces optiques, notamment des surfaces de moulage libre Download PDF

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Publication number
EP2384854A2
EP2384854A2 EP20110164042 EP11164042A EP2384854A2 EP 2384854 A2 EP2384854 A2 EP 2384854A2 EP 20110164042 EP20110164042 EP 20110164042 EP 11164042 A EP11164042 A EP 11164042A EP 2384854 A2 EP2384854 A2 EP 2384854A2
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EP
European Patent Office
Prior art keywords
polishing
polishing tool
edge
radial direction
tool according
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
EP20110164042
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German (de)
English (en)
Other versions
EP2384854A3 (fr
EP2384854B1 (fr
Inventor
Gerd Nowak
Michael Zaiser
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.)
Carl Zeiss Vision International GmbH
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Carl Zeiss Vision International GmbH
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
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Priority to PL11164042T priority Critical patent/PL2384854T3/pl
Publication of EP2384854A2 publication Critical patent/EP2384854A2/fr
Publication of EP2384854A3 publication Critical patent/EP2384854A3/fr
Application granted granted Critical
Publication of EP2384854B1 publication Critical patent/EP2384854B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S451/00—Abrading
    • Y10S451/921—Pad for lens shaping tool

Definitions

  • the present invention relates to a polishing tool for processing an optical surface of a spectacle lens, comprising a carrier body and a polishing foil, wherein an elastic layer is arranged between the polishing foil and the carrier body.
  • the present invention relates to a device for processing optical surfaces with such a polishing tool.
  • polishing tools and devices are for example from the document WO 2005/068133 A1 known.
  • Spectacle lenses are conventionally produced from a semi-finished product by machining or abrasive processing of the so-called prescription surface or surfaces. This is the optically relevant design of the lens fixed. Finally, the lens is still polished, but by polishing no change in the optical properties of the lens may be effected.
  • a polishing head For polishing a surface of a spectacle lens, a polishing head is usually used which has a polishing tool whose polishing surface is at least approximately adapted to a shape of the surface of the spectacle lens to be polished.
  • the polishing tool and / or the spectacle gas are articulated, in particular with a ball joint, mounted, and are guided relative to one another with a predetermined sequence of movements, usually with the aid of CNC-controlled systems.
  • polishing spherical or toric spectacle lenses it is less problematic due to the relatively simple shape of the surface to be polished to find a suitable, complementary formed polishing tool that can be performed with simple movements over the surface and does not cause undue deformation. Due to the large number of possible spherical or toric spectacle lenses, it is only necessary to have a corresponding multiplicity of polishing tools available.
  • polishing tools are for example from the publications DE 101 00 860 A1 . EP 0 567 894 B1 . DE 44 42 181 A1 . DE 102 42 422 or DE 101 06 007 A1 known.
  • polishing tools Common to these polishing tools is that a compressive rigidity running in a radial direction of the polishing tool is either constant from the inside to the outside or slightly decreases. The bending rigidity of the polishing tool thus decreases from the inside to the outside in a direction in which a force is applied to the spectacle lens by the polishing tool or is constant.
  • Aspherical or point-symmetric surfaces and free-form surfaces have curvatures that change over the surface.
  • such free-form surfaces are used in individual lenses adapted to a user.
  • the polishing tool moves during the polishing processing of such free-form surfaces at least over a part of this irregularly curved surface.
  • the polishing tool must therefore be able to adapt to the respective local curvature with its bending stiffness or elasticity, in such a way that the polishing pressure over the contact surface is as constant as possible. Only then is there a definable constant removal and the polished surface is evenly polished. If this is not guaranteed, the surface or the topography of the free-form surface will be deformed and its optical quality will be worsened.
  • the plastic materials of the spectacle lenses are, for example, a polycarbonate, such as CR 39, which is marketed by PPG Industries, Pittsburgh, USA.
  • the polishing tools usually consist of an at least three-layered construction.
  • the polishing tools have at least one of the tool spindle rotating the tool spindle facing solid base on which a foam layer or other elastic layer is glued or attached.
  • a polishing foil facing the spectacle lens or workpiece is provided on this foam layer. Due to the elastic deformability of the foam layer, the polishing film can adapt to a certain degree of topography of the lens surface to be polished.
  • the polishing tools are generally smaller than the lens.
  • the polishing removal comes about with the aid of an abrasive polishing liquid by the relative movement of the pressurized polishing tool.
  • polishing force applied by the tool to the glass decreases outwardly in the edge area of the polishing surface of the polishing tool, ideally to zero continuously. If this is not sufficiently ensured, visible on the polished glass, caused by the edge of the polishing tool spiral structures that deteriorate the quality of the lens surface and make it even unusable.
  • polishing sheet curls and sets in the direction of the glass surface, which can cause polishing defects.
  • This can be done by diffusing liquid polishing agent into the edge region of the polishing film and the resulting swelling of the porous material.
  • Cosmetic defects can also be caused by peripherally embedded and firmly dried polishing agent.
  • polishing tools with different, pneumatically actuated pressure zones have also been proposed.
  • these polishing tools require a structurally complex construction, which in turn is expensive and maintenance-prone.
  • the pressure zones can not be arbitrarily finely resolved, so that, in particular, in critical marginal areas, despite everything, there is often insufficient control over the pressure conditions.
  • the material removal generated under the polishing film can be selectively influenced in the edge region and reduced to nearly zero at the edge.
  • edge region also leads to a substantially increased circumferential length of a contour of the polishing tool. This allows a more intensive exchange of liquid polishing agent between the optical surface and the polishing film during the polishing process. As a result, an advantageous stabilization of the lubrication is achieved.
  • optical surface is to be understood as meaning all optical surfaces of spectacle lenses, in particular aspheric surfaces or free-form surfaces. In principle, however, the optical surface may be spherical and toric surfaces, point-symmetrical aspheres or free-form surfaces. The optical surface can be curved both convexly and concavely.
  • the polishing tool can also be used both for the processing of plastic spectacle lenses and mineral spectacle lenses.
  • polishing film is understood to mean the element of the polishing tool acting on the optical surface, i. That part or that element of the polishing tool which comes into contact with the optical surface, optionally with the aid of a liquid polishing agent.
  • polishing film is in no way limiting, in particular with regard to the thickness or another embodiment of the polishing film or a polishing element to understand.
  • the device therefore has the same advantages as the polishing tool.
  • the surface of the polishing film which acts during the processing decreases steadily outward in the radial direction to the outside in the edge region of the polishing foil to zero.
  • edge region is to be understood as meaning that region of the polishing tool in which the edge elements are provided, as will be explained in detail below.
  • the polishing tool In the border area is the polishing tool is not formed over the entire surface, but has interruptions of the acting surface between the edge elements.
  • the width of the edge region may be about 5% -20% of the outside diameter of the polishing tool. The dimensioning of the edge area will also be discussed in more detail below.
  • a continuous transition to zero is provided on an outer edge of the polishing tool, that is, no sudden drop of the acting surface is provided to zero.
  • the polishing tool is configured to apply a force to the optical surface to be processed in a certain direction, wherein a flexural rigidity of the polishing tool decreases in the specific direction in the radial direction towards the outside.
  • the "certain direction" is normal to the acting surface of the polishing film.
  • the force distribution in the edge region can be further adjusted.
  • the flexural rigidity of the polishing tool decreases in the certain direction toward the outside.
  • the acting area can be reduced because the recessed portion of the surface of the polishing sheet facing the optical surface does not contact the optical surface, the mechanical strength or bending rigidity can be substantially maintained. If complete openings of the polishing foil and also of the elastic layer and of the carrier body are provided, it is possible, for example, both to reduce the effective area and to reduce the bending stiffness.
  • the edge region is bounded in the radial direction on the inside by a base circle.
  • the basic form of the polishing tool is a circular shape. Inside the base circle, the polishing tool can be formed over its entire surface. Alternatively, however, there may also be recesses, in particular star-shaped slots pointing away from the center of the base circle, in order to increase the elasticity of the polishing tool towards the outside. For example, six slots each about 1.5 mm to 2.0 mm wide may be provided.
  • edge elements By means of the edge elements, it is possible in a simple manner to implement the demand for a decreasing in the radial direction outwardly acting surface of the polishing film.
  • each edge element ends radially outward in an end point.
  • edge elements that terminate radially outward at an endpoint.
  • an edge element ends radially outwardly in more than one point, that is, for example, in a head line or the like. This reduces the advantageous effect achieved according to the invention.
  • the edge region is bounded in the radial direction on the outside by a tip circle, wherein the end point of at least one edge element lies on the tip circle.
  • each edge element lies on the top circle.
  • edge elements can thus protrude equally far or differently far from the base circle radially outwards. This technically simplest solution results when the edge elements are formed such that their end points are all on the top circle.
  • edge elements are provided between longer edge elements, so that the end points are not all located on the top circle, but also end points are arranged within the edge region, that is between the base circle and the top circle.
  • edge elements extend in the radial direction at least two millimeters, in particular about four millimeters.
  • this distance corresponds to the difference between the radius of the top circle and the radius of the base circle.
  • this difference of the radius of the top circle and base circle can correspond to about 5 to 20% of the radius of the top circle, in particular about 10 to 15%.
  • flanks of the edge elements are formed as teeth.
  • edge elements are formed as involutes.
  • edge elements shapes which are known for example from the production of pinions. Accordingly, the production engineering measures known there can also be easily adapted. Furthermore, with regard to the meaning of the terms “tooth”, “flank” and “involute” is based on the understanding of the average person skilled in the field of gears or pinions.
  • a conventional cutting device such as a CNC-controlled water or laser beam cutting machines, or a corresponding punching device may be provided.
  • abrasive production measures are conceivable.
  • an angle between mutually adjacent flanks of two adjacent edge elements between about 5 ° and 180 °, in particular 40 ° and 150 °, in particular 70 ° and 120 ° is, in particular, the angle 10 °, 15 °, 20 °, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150, 155, 160, 165, 170 and 175 degrees.
  • the base circle forms an inner circle drawn in the square
  • the head circle forms an outer circle of the square drawn through the corners of the square. There are then four border areas.
  • a composite contour of the edge elements in the circumferential direction can be described as a sinusoidal function.
  • any other regularly or irregularly curved contour can be provided such that the surface acting during machining decreases in the radial direction to the outside.
  • the edge elements are formed, for example, as serrations or teeth and an angle is arranged between the flanks. It may also be that a sinusoidal function results for the contour in the circumferential direction, that is, the contour is wave-shaped.
  • the amplitude and the frequency of the contour can be adjusted to achieve a corresponding distribution of the acting surface. For the amplitude, what has been said for the radial extent of the edge elements can be considered, i. a double amplitude may be about 5% to about 20% of the radius of the top circle.
  • the frequency may be chosen such that the descriptive sine function over the circumference, more than two, in particular three to fifteen, in particular five to ten, in particular two, three, four, five, six, seven, eight, nine, ten, fifteen, performs twenty or more oscillations.
  • the polishing tool is designed to process freeform surfaces.
  • polishing tool is characterized by a sufficient adaptability to the lens. This is achieved on the one hand by an elastic construction and on the other hand by a diameter suitable for the spectacle lens and a curvature of the tool adapted to the polished surface.
  • an outer diameter of the polishing tool i. a diameter of the top circle, about 40 mm to about 60mm, in particular about 45 mm to 50 mm.
  • a diameter of the elastic layer may be formed smaller than a diameter of the polishing sheet, i. the polishing sheet protrudes outside over an edge of the elastic layer.
  • an outer diameter of the elastic layer may be 40 mm and an outer diameter of the polishing film 45 mm.
  • the outer diameter of the polishing tool is usually selected such that a ratio of the outer diameter of the polishing tool to an outer diameter of the spectacle lens is about 0.5 to 1.0. However, the ratio may be greater than 1.0.
  • a thickness of the elastic layer in an axial direction may in all embodiments be about 6 mm to about 12 mm, in particular 8 mm.
  • An axial thickness of the polishing sheet is from about 0.5 mm to about 2.0 mm, with prepreg polishing sheets being rather thin, i. about 0.5 to 0.8 mm, and polishing films for fine polishing are made rather thick, i. about 1.2 to 1.8 mm.
  • Fig. 1 shows a reference numeral 10 generally indicates a device for processing a spectacle lens 12. It is understood that the application of a spectacle lens is to be understood in the following only by way of example. Of course, the advantages of this device can also be used for polishing other optical components with spherical as well as aspheric or toric optical surfaces or free-form surfaces.
  • the spectacle lens 12 is held in a holder 14.
  • the holder 14 may be arranged fixed in space about a first axis 15 around.
  • the spectacle lens 12 has a rear surface 16 and a front surface 18.
  • the rear surface 16 is designed as a prescription surface, that is to say as the surface which is optically processed in a predetermined manner and, in particular, is designed as a free-form surface.
  • the front surface 18 is provided with an optical effect, for example with a predetermined addition.
  • the polishing head 20 which has a polishing tool 22 at its free end.
  • the polishing tool 22 has a carrier body 24, an elastic layer 26 and a polishing foil 28.
  • the elastic layer 26 is provided between the substantially rigid carrier body 24 and the polishing film 28.
  • the elastic layer 26 may, for example, radially outwardly in increase in thickness to provide increasing elasticity at their outer ends.
  • openings may be provided in the elastic layer 26 and the polishing sheet 28 to apply a polishing liquid or a polishing agent to the optical surface 16.
  • an operative surface 29 of the polishing film 28 is in sliding contact with the optical surface 16 of the spectacle lens 12.
  • the carrier body 24 has a ball socket 30, in which a ball head 32 of an actuator 34 is arranged.
  • the actuator causes the polishing tool 22 to rotate about a second axis 36 and also to pivot about the ball head 32.
  • a rotational speed about the second axis 36 is usually about 1200 to 1500 revolutions per minute, but in individual cases it can also be lower or higher.
  • a ball joint may alternatively be provided a universal joint, possibly in combination with a surrounding bellows or a similar element.
  • movement about the first axis 15 is provided so that the optical surface 16 is completely swept and polished.
  • An axial mobility of the polishing tool depends on a tool holder (not shown) and may, for example, be about 2 to about 5 mm in a tool holder with a bellows.
  • the elastic layer 26 is preferably made of rubber or rubber. But it can be made of a polyurethane material, such as polyurethane or polyetherurethane. Such materials are known and available, for example, under the trade names Sylomer, Sylodyn and Sylodamp. An elastic modulus of the elastic layer should be greater than 0.02 N / mm 2 .
  • the illustrated central arrangement of the second axis 36 relative to the polishing tool 22 may also be an eccentric arrangement the second axis relative to the polishing tool 22 may be provided to cause an additional rotational movement of the polishing tool on the spectacle lens 12.
  • Fig. 2 shows a first embodiment of a polishing tool 22.
  • the polishing tool comprises in a conventional manner the carrier body 24, the elastic layer 26 and the polishing film 28, as already in Fig. 1 is shown.
  • a radial direction is denoted by a reference numeral 40
  • a circumferential direction is denoted by a reference numeral 42.
  • the composite contour 38 in the circumferential direction 42 can be described as a sinusoidal function.
  • the contour 38 extends between a tip circle 44 and a base circle 46, which together define an edge region 47.
  • the edge region 47 thus indicates the region of the polishing tool 22 in which the acting surface 29 of the polishing tool 22 decreases in the radial direction 40 to the outside.
  • the acting surface 29 is completely closed within the base circle 46 in the illustrated embodiment, that is, the acting surface 29 is provided over a complete arc angle of 360 °. If one moves from the base circle 46 in the radial direction 40 outwards to the tip circle 44 and determines the composite arc angle of the acting surface 29, the acting surface 29 or the composite arc angle increasingly decreases in the direction of the tip circle 44 and approaches zero.
  • the structural design of the acting surface 29 is realized by means of several edge elements 48. Due to the sinusoidal contour 38, the edge elements 48 correspondingly have a wave-shaped course. For the edge elements 48 thus results in a marked with the reference numeral 50 double amplitude and designated by the reference numeral 52 frequency.
  • the edge elements 48 are each only with an end point 54 on the top circle 44. This ensures that the acting surface 29 does not abruptly drops to zero on the top circle, but steadily strives towards zero.
  • Fig. 3 shows another possible embodiment of the polishing tool 22.
  • the edge elements 48 are formed as teeth, so that the polishing tool 22 results in a shape similar to a pinion.
  • Each edge element 48 or each point also has an end point 54, all of which lie on the top circle 44.
  • Adjacent tooth flanks 56, 57 of two edge elements 48 enclose an angle 58. This angle can be between about 5 ° and 180 °, in the case shown it is about 80 °.
  • Fig. 4 shows a further embodiment, which is a special case of in Fig. 3 shown embodiment.
  • the angle 58 is exactly 180 °.
  • the base circle 46 in this case forms an inner circle of the square and the tip circle 44 through the corners of the square extending outer circle. The corners of the square then form the end points 54 which lie on the top circle 44.
  • this contour 38 of the polishing tool 22 or the acting surface 29 of the polishing tool 22 can provide the advantages according to the invention and significantly improve the cosmetic quality of polished free-form surfaces.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
EP11164042.1A 2010-04-30 2011-04-28 Outil de polissage pour le traitement de surfaces optiques, notamment des surfaces de moulage libre Active EP2384854B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL11164042T PL2384854T3 (pl) 2010-04-30 2011-04-28 Narzędzie polerskie do obróbki powierzchni optycznych, zwłaszcza powierzchni swobodnych

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US32993710P 2010-04-30 2010-04-30
DE102010019491.3A DE102010019491B4 (de) 2010-04-30 2010-04-30 Polierwerkzeug zur Bearbeitung von optischen Flächen, insbesondere Freiformflächen

Publications (3)

Publication Number Publication Date
EP2384854A2 true EP2384854A2 (fr) 2011-11-09
EP2384854A3 EP2384854A3 (fr) 2014-09-17
EP2384854B1 EP2384854B1 (fr) 2015-10-28

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EP11164042.1A Active EP2384854B1 (fr) 2010-04-30 2011-04-28 Outil de polissage pour le traitement de surfaces optiques, notamment des surfaces de moulage libre

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Country Link
US (1) US8979618B2 (fr)
EP (1) EP2384854B1 (fr)
DE (1) DE102010019491B4 (fr)
ES (1) ES2559811T3 (fr)
HU (1) HUE026187T2 (fr)
PL (1) PL2384854T3 (fr)
PT (1) PT2384854E (fr)

Cited By (2)

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EP3106262A1 (fr) * 2015-06-15 2016-12-21 OptoTech Optikmaschinen GmbH Dispositif de polissage destine a polir des surfaces de lentilles optiques et son procede de fonctionnement
US10166646B2 (en) 2015-06-15 2019-01-01 Optotech Optikmaschinen Gmbh Polishing device for polishing concave lens faces of optical lenses, and method for operation thereof

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FR2980386B1 (fr) * 2011-09-27 2014-09-12 Visioptimum Internat Dispositif de polissage de lentilles optiques
EP2662185A1 (fr) * 2012-05-11 2013-11-13 Cerium Group Limited Plaquette de revêtement de lentille
DE102013220973A1 (de) * 2013-10-16 2015-04-16 Carl Zeiss Vision International Gmbh Werkzeug zur Polierbearbeitung von optischen Flächen
CN105458868A (zh) * 2015-11-17 2016-04-06 江苏永信光学仪器有限公司 光学镜片凸面抛光模具

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EP0567894B1 (fr) 1992-05-01 1995-11-29 Loh Engineering Ag Dispositif pour le guidage d'une pièce ou d'un outil lors de l'usinage de surfaces toriques ou sphériques de lentilles optiques sur machine à meuler ou polir
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DE10242422A1 (de) 2001-09-13 2003-04-10 Gerber Coburn Optical Inc Läppscheibe, die eine Schicht aufweist, die Krümmungen optischer Flächen auf Linsen anpaßbar ist und Verfahren für die Feinbearbeitung optischer Flächen
EP1644160B1 (fr) 2003-07-16 2007-09-12 ESSILOR INTERNATIONAL (Compagnie Générale d'Optique) Outil pour le surfa age d'une surface optique
WO2005068133A1 (fr) 2004-01-15 2005-07-28 Carl Zeiss Vision Gmbh Dispositif et procede pour polir une surface optique, composant optique, et procede pour realiser un outil de polissage
US20060094341A1 (en) 2004-10-29 2006-05-04 Gunter Schneider Polishing tool with several pressure zones
DE102005010583A1 (de) 2005-03-04 2006-09-07 Satisloh Gmbh Polierteller für ein Werkzeug zur Feinbearbeitung von optisch wirksamen Flächen an insbesondere Brillengläsern

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3106262A1 (fr) * 2015-06-15 2016-12-21 OptoTech Optikmaschinen GmbH Dispositif de polissage destine a polir des surfaces de lentilles optiques et son procede de fonctionnement
US10166646B2 (en) 2015-06-15 2019-01-01 Optotech Optikmaschinen Gmbh Polishing device for polishing concave lens faces of optical lenses, and method for operation thereof

Also Published As

Publication number Publication date
DE102010019491A1 (de) 2011-11-03
HUE026187T2 (en) 2016-05-30
EP2384854A3 (fr) 2014-09-17
US20110275295A1 (en) 2011-11-10
PL2384854T3 (pl) 2016-06-30
EP2384854B1 (fr) 2015-10-28
PT2384854E (pt) 2016-02-16
US8979618B2 (en) 2015-03-17
DE102010019491B4 (de) 2015-07-09
ES2559811T3 (es) 2016-02-16

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