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US20020031993A1 - Receiving chuck for optical components for the purpose of precision-grinding and/or polishing - Google Patents

Receiving chuck for optical components for the purpose of precision-grinding and/or polishing Download PDF

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Publication number
US20020031993A1
US20020031993A1 US09/961,408 US96140801A US2002031993A1 US 20020031993 A1 US20020031993 A1 US 20020031993A1 US 96140801 A US96140801 A US 96140801A US 2002031993 A1 US2002031993 A1 US 2002031993A1
Authority
US
United States
Prior art keywords
chuck
basic body
cylindrical
recesses
cover part
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.)
Abandoned
Application number
US09/961,408
Other languages
English (en)
Inventor
Eginhard Jung
Guenther Boehm
Michael Thomas
Helmut Lotz
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.)
Leica Camera AG
Original Assignee
Leica Camera AG
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 Leica Camera AG filed Critical Leica Camera AG
Assigned to LEICA CAMERA AG reassignment LEICA CAMERA AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LOTZ, HELMUT, BOEHM, GUENTHER, JUNG, EGINHARD, THOMAS, MICHAEL
Publication of US20020031993A1 publication Critical patent/US20020031993A1/en
Abandoned 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
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies
    • B24B41/061—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically

Definitions

  • the invention relates to a chuck for optical components for fine grinding and/or polishing, having a plurality of supporting elements of elastic material for the components and an arrangement for feeding or discharging air relative to the rear side of the supporting element, the chuck having a basic body with a spindle shank having a central bore and a cover part for accommodating the supporting elements.
  • the optical components provided are preferably spherical convexly or concavely curved lenses.
  • German Publication DE 198 12 186 A1 discloses a chuck of this type for machining individual lenses.
  • the lens holder consists of a rotationally symmetrical basic body with a recess, into which a lens to be machined is inserted and which is closed off toward the other side by a rubber diaphragm. Compressed air can be admitted to the rubber diaphragm at its rear side via a central bore in the shank of the chuck. When the rubber diaphragm then extends, it bears against the lens and presses the latter uniformly against the polishing tool. Surface contact occurs in the process, since both parts have the same radius of curvature. By producing a vacuum at the diaphragm surface, the lens can be drawn against the diaphragm surface and put into a suspended position.
  • Different bearing pressures by the diaphragm surface may occur on account of the dead weight of the lens. Since, during polishing, not only is the surface quality improved but corrections in the lens geometry within a fine range are also carried out. A varying bearing pressure leads to inaccuracies in the lens surface.
  • the suspended mounting of the lens is therefore preferably selected, so that its dead weight assists the bearing pressure relative to the polishing tool after the diaphragm has been vented for the polishing operation. In the case of a horizontal mounting, the uniformity of the bearing pressure can be assisted, for example, by different thicknesses in the diaphragm.
  • the centrally supplied compressed-air quantity can be adapted individually to the lens to be machined.
  • European Publication EP 0 169 931 A1 discloses a chuck with which supporting zones having different bearing pressure can be produced in the diaphragm surface by the supply of differently controlled air pressures.
  • an embodiment for the simultaneous mounting of a plurality of lenses is also described.
  • Such a chuck has a basic body and a supporting body connected to it.
  • the supporting body is provided with a cap-shaped covering, which is held by an enclosing ring on the basic body.
  • a plurality of recessed portions are provided in the supporting body symmetrically to the rotational axis of the supporting body.
  • the cap-shaped covering forms an elastic diaphragm, on which the lenses to be machined rest with their central region.
  • the mounting of the lens as a whole is formed by a shaped portion in the cap-shaped covering, this shaped portion being adapted to the lens diameter.
  • the basic body has a shank for holding the chuck in a machine tool. In the region of the shank, the basic body contains a central aperture for the air feed.
  • Each of the recessed portions in the supporting body is connected to the central aperture in the basic body by a separate air passage, and the respective diaphragm parts of the covering are fixed in the recessed portion and close off the latter in an airtight manner. Via a passage inside the central aperture and through the supporting body, this passage is separate from the other air passages, and compressed air can be admitted to the remaining bottom surface of the covering. In this way, supporting zones with different pressure can be produced inside each lens seating.
  • the covering has a complex shape and requires complicated assembly on the supporting body. Although the air feed can also be controlled individually in the diaphragm parts, the local pressure build-up under the remaining surface of the covering cannot be influenced via the central air feed.
  • U.S. Pat. No. 2,509,211 discloses a device with which a plurality of lenses can be mounted on a convex cup.
  • the cup contains a plurality of recesses in which adjustable knife-edge seatings of metal can be inserted as essential functional elements.
  • the cup is designed as a hemispherical shell which is closed with a base plate.
  • a bore leads from the recesses into the cup interior space.
  • a hollow shank is fastened centrally to the base plate, this hollow shank likewise being connected via a bore to the cup interior space.
  • the hollow shank is connected to a vacuum line, so that the lenses placed on the knife-edge seatings are held by the vacuum.
  • the device serves to feed the lenses, preadjusted on the cup via the knife-edge seatings, into the bed of a concave grinding or polishing cup in such a way as to be oriented in position.
  • An object of the invention is to provide a chuck which permits multiple mounting having the advantages of single mounting through the use of mass-produced diaphragm elements and is of simple design.
  • the recesses in the cover part can be prepared for commercially available elastic supporting elements having different dimensions.
  • the fastening and sealing via an O-ring pressed into a groove permits simple assembly and also acts as a pressure relief device. If air pressure reaches the diaphragm unintentionally without a lens being properly seated and a polishing tool being brought up to the lens, the supporting element is pushed out of the holder without being destroyed.
  • the holder can be provided with a drive spindle which extends into the space of the basic body and is connected here to the drive for the spindle shank via gearing means.
  • FIG. 1 shows a chuck with supporting elements firmly inserted into the cover part
  • FIG. 2 shows a chuck with supporting elements inserted into the cover part in a rotatable manner.
  • the chuck according to FIG. 1 contains a basic body 1 with a spindle shank 2 which is inserted into a machine spindle (not shown in any more detail) for rotating the chuck.
  • the spindle shank 2 is provided with a central bore 3 which is connected to a compressor vacuum system (likewise not shown) for the air supply.
  • the basic body 1 has an encircling rim 4 which forms a pot-shaped space 5 in the basic body 1 , this pot-shaped space 5 extending over the entire base area of the basic body 1 .
  • a cover part 6 Lying on the rim 4 of the basic body 1 is a cover part 6 , which is screwed to the basic body 1 and closes the pot (that is, cylindrical) space 5 via an O-ring seal 7 .
  • the cover part 6 has a cylindrical recess 8 .
  • An elastomeric supporting element which in this case is designed as a hat-shaped diaphragm part 9 with a hat brim 10 pointing outward, lies on the base of the recess 8 .
  • diaphragm parts 9 are available as mass-produced parts for individual lens receptacles.
  • the hat brim 10 engages in a groove 11 in the recess 8 and is firmly pressed here onto the base of the recess 8 by an O-ring 12 . That spatial region of the recess 8 which lies below the diaphragm part 9 is fluidically connected to the pot space 5 via a bore 13 . Of course, further bores, also of different diameter, may be provided for more rapid air supply if required.
  • a lens 14 to be machined is placed with its convex lens side onto the diaphragm part 9 . Here, the lens surface to be machined is slightly concave.
  • the top side 15 of the cover part 6 is adapted to the concave lens surface in a conventional manner with a slightly larger radius, so that the schematically indicated polishing cup 16 can machine the lens surface without hindrance.
  • a positive pressure is produced in the space below the diaphragm part 9 via the air reservoir built up in the pot space 5 and via the bore 13 , and this positive pressure elastically deforms the diaphragm part 9 until it bears against the surface of the lens 14 in a positive-locking manner.
  • FIG. 2 An exemplary embodiment shown in FIG. 2 is based on the same basic construction as in FIG. 1.
  • the same parts are provided with the same reference numerals.
  • the cylindrical recess 8 is designed as a cylindrical bore 18 , into which a cylindrical holder 19 is inserted, this holder 19 having the same holding elements for the diaphragm part 9 as in FIG. 1.
  • the holder 19 is provided with a drive spindle 20 which is provided with a bore 13 for the fluid connection to the pot space 5 and extends into the pot space 5 .
  • the drive spindle 20 is held in the base of the cylindrical bore 18 by a rotary bearing 21 , so that the holder 19 is rotatable about its axis 22 .
  • the drive spindle 20 is provided with gearing means 23 (not shown in any more detail), which are coupled, for example, to the drive for the spindle shank 2 via a bevel gear 24 .
  • a convex lens surface is provided here for the machining, so that the top side 15 of the cover part 6 is of corresponding convex shape.
  • the axis 22 is inclined with respect to the axis 17 of the spindle shank 2 .
  • the axis 22 would be directed away from the axis 17 .
  • the different direction of the rotational axes relative to the central drive means can be compensated for by appropriately shaped bevel gears 24 as part of the gearing means 23 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
US09/961,408 2000-01-27 2001-09-25 Receiving chuck for optical components for the purpose of precision-grinding and/or polishing Abandoned US20020031993A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10003291A DE10003291C2 (de) 2000-01-27 2000-01-27 Aufnahmefutter für optische Bauteile zum Feinschleifen und/oder Polieren
DE10003291.5 2000-01-27
PCT/DE2001/000241 WO2001054861A1 (de) 2000-01-27 2001-01-19 Aufnahmefutter für optische bauteile zum feinschleifen und/oder polieren

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2001/000241 Continuation WO2001054861A1 (de) 2000-01-27 2001-01-19 Aufnahmefutter für optische bauteile zum feinschleifen und/oder polieren

Publications (1)

Publication Number Publication Date
US20020031993A1 true US20020031993A1 (en) 2002-03-14

Family

ID=7628767

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/961,408 Abandoned US20020031993A1 (en) 2000-01-27 2001-09-25 Receiving chuck for optical components for the purpose of precision-grinding and/or polishing

Country Status (7)

Country Link
US (1) US20020031993A1 (de)
EP (1) EP1165286B1 (de)
JP (1) JP2003520694A (de)
AT (1) ATE256528T1 (de)
CZ (1) CZ294053B6 (de)
DE (2) DE10003291C2 (de)
WO (1) WO2001054861A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060094341A1 (en) * 2004-10-29 2006-05-04 Gunter Schneider Polishing tool with several pressure zones
US8951097B2 (en) 2009-12-24 2015-02-10 Essilor International (Compagnie Generale D'optique) Method for mounting an optical lens to be polished
ITMI20131758A1 (it) * 2013-10-22 2015-04-23 Mei S R L Processo di lavorazione di una lente

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10053977C2 (de) * 2000-10-31 2002-11-21 Leica Camera Ag Tragvorrichtung für mehrere Aufnahmefutter
DE10239522B4 (de) 2002-08-23 2016-02-11 Leica Geosystems Ag Halteeinrichtung für ein optisches Element
DE10249251B4 (de) * 2002-10-23 2004-08-19 Loh Optikmaschinen Ag Membran für eine Werkstückaufnahme
DE102006017685A1 (de) * 2006-04-15 2007-10-18 Carl Zeiss Ag Vorrichtung zum Bearbeiten, insbesondere zum Schleifen und Polieren, eines Werkstückes

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2441472A (en) * 1946-08-08 1948-05-11 D Avaucourt Pierre De Vitry Lens chuck
US3020684A (en) * 1957-12-26 1962-02-13 Textron Inc Lens blocking device
US3889426A (en) * 1974-01-07 1975-06-17 Bausch & Lomb Optical lens generating machine having an air rotatable spherical bearing workpiece holder
US4669226A (en) * 1984-08-03 1987-06-02 Wilhelm Loh Wetzlar Optikmaschinen Gmbh & Co. Kg Device for holding delicate workpieces, in particular optical lenses and other optical structural elements
US5951375A (en) * 1996-05-17 1999-09-14 Optotech Optikmaschinen Gmbh Support for optical lenses and method for polishing lenses
US6224467B1 (en) * 1997-07-31 2001-05-01 Menicon Co., Ltd. Method of producing ocular lens and holders for holding lens blank during cutting thereof

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2509211A (en) * 1947-06-27 1950-05-30 George A Clement Apparatus for blocking lenses
US2736993A (en) * 1953-03-25 1956-03-06 American Optical Corp Abrading apparatus
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
DE19812186C2 (de) * 1998-03-19 2000-12-21 Optotech Optikmasch Gmbh Linsenhalter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2441472A (en) * 1946-08-08 1948-05-11 D Avaucourt Pierre De Vitry Lens chuck
US3020684A (en) * 1957-12-26 1962-02-13 Textron Inc Lens blocking device
US3889426A (en) * 1974-01-07 1975-06-17 Bausch & Lomb Optical lens generating machine having an air rotatable spherical bearing workpiece holder
US4669226A (en) * 1984-08-03 1987-06-02 Wilhelm Loh Wetzlar Optikmaschinen Gmbh & Co. Kg Device for holding delicate workpieces, in particular optical lenses and other optical structural elements
US5951375A (en) * 1996-05-17 1999-09-14 Optotech Optikmaschinen Gmbh Support for optical lenses and method for polishing lenses
US6224467B1 (en) * 1997-07-31 2001-05-01 Menicon Co., Ltd. Method of producing ocular lens and holders for holding lens blank during cutting thereof

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060094341A1 (en) * 2004-10-29 2006-05-04 Gunter Schneider Polishing tool with several pressure zones
US7217176B2 (en) * 2004-10-29 2007-05-15 Schneider Gmbh & Co. Kg Polishing tool with several pressure zones
US8951097B2 (en) 2009-12-24 2015-02-10 Essilor International (Compagnie Generale D'optique) Method for mounting an optical lens to be polished
ITMI20131758A1 (it) * 2013-10-22 2015-04-23 Mei S R L Processo di lavorazione di una lente
WO2015059007A1 (en) * 2013-10-22 2015-04-30 Mei S.R.L. Process for machining a lens
CN105873747A (zh) * 2013-10-22 2016-08-17 美意有限公司 用于加工透镜的工艺
CN105873747B (zh) * 2013-10-22 2018-11-02 美意有限公司 用于加工透镜的工艺
US10926370B2 (en) 2013-10-22 2021-02-23 Mei S.R.L. Process for machining a lens

Also Published As

Publication number Publication date
EP1165286B1 (de) 2003-12-17
CZ294053B6 (cs) 2004-09-15
WO2001054861A1 (de) 2001-08-02
JP2003520694A (ja) 2003-07-08
DE10003291A1 (de) 2001-08-09
DE10003291C2 (de) 2001-11-22
DE50101171D1 (de) 2004-01-29
EP1165286A1 (de) 2002-01-02
CZ20013364A3 (cs) 2002-07-17
ATE256528T1 (de) 2004-01-15

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Legal Events

Date Code Title Description
AS Assignment

Owner name: LEICA CAMERA AG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:JUNG, EGINHARD;BOEHM, GUENTHER;THOMAS, MICHAEL;AND OTHERS;REEL/FRAME:012324/0688;SIGNING DATES FROM 20010918 TO 20011008

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION