EP0727280A1 - Procédé et appareil pour polir des lentilles sphériques - Google Patents

Procédé et appareil pour polir des lentilles sphériques Download PDF

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Publication number
EP0727280A1
EP0727280A1 EP95101961A EP95101961A EP0727280A1 EP 0727280 A1 EP0727280 A1 EP 0727280A1 EP 95101961 A EP95101961 A EP 95101961A EP 95101961 A EP95101961 A EP 95101961A EP 0727280 A1 EP0727280 A1 EP 0727280A1
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EP
European Patent Office
Prior art keywords
polishing
tool
lens
dressing
polishing tool
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
EP95101961A
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German (de)
English (en)
Other versions
EP0727280B1 (fr
Inventor
Roland Dipl. Ing. Mandler
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.)
Opto Tech GmbH
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Opto Tech GmbH
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Filing date
Publication date
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Application filed by Opto Tech GmbH filed Critical Opto Tech GmbH
Priority to EP19950101961 priority Critical patent/EP0727280B1/fr
Priority to DE59500684T priority patent/DE59500684D1/de
Priority to DE29520993U priority patent/DE29520993U1/de
Publication of EP0727280A1 publication Critical patent/EP0727280A1/fr
Application granted granted Critical
Publication of EP0727280B1 publication Critical patent/EP0727280B1/fr
Anticipated expiration legal-status Critical
Revoked 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
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B53/00—Devices or means for dressing or conditioning abrasive surfaces

Definitions

  • the invention relates to an apparatus and a method for polishing spherical lens surfaces according to the preambles of claims 1 and 13.
  • Optical glass is processed in several stages.
  • the radius tolerance and the permissible asphericity should be less than 1 to 2 ⁇ m. This can be achieved, for example, using the ball cut process or a tangential cup grinding process.
  • the glass After the fine grinding, the glass usually still has a roughness depth of about 3 to 8 ⁇ m, so that light passing through it is scattered indiscriminately.
  • the polishing is carried out by a sliding movement between the surface of the workpiece to be machined and a polishing tool, which acts as a holder for a polishing agent carrier is formed. In conjunction with a polishing agent, this enables polishing removal and thus adaptation or smoothing of the workpiece surface.
  • the polishing agent carrier must be able to be shaped in order to be able to assume the required workpiece radius, it must be easy to connect to the tool carrier and it must not contain any contaminants that could damage the glass surface.
  • well suited elastomer foils made of foamed polyurethane which largely meet these requirements due to their good mechanical and chemical properties.
  • the requirements for a polishing agent cannot be directly attributed to measurable sizes, so that the selection and mixing of the polishing agent is based essentially on experience. Suspensions of finely ground oxides of trivalent and tetravalent metals are predominantly used, which however depend strongly on the material to be processed.
  • a tool often determines the shape of a workpiece during machining. However, this is not the case when polishing glass materials, such as in metal cutting. Particularly when polishing glass lenses, the polishing agent carrier is adjusted to the surface of the workpiece due to wear, so that only a few areas of the tool radius have changed after machining. The target contour of the lens surface quickly lies outside the specified tolerances. This makes it necessary to align the polishing agent carrier at regular intervals to the required ball radius during the polishing process, i.e. To adapt so that the shape and the grip of the polishing tool are preserved.
  • a polishing tool is usually dressed outside the polishing machine on special dressing machines. These are, for example, lever machines with diamond pellet-coated surface tools, the setting of which, however, can only be done empirically.
  • the polishing correction tool must be ground in by means of a special tool to be produced separately before the actual correction of the polishing tool can take place. Often, several corrections of the correction tool and possibly also the grinding tool are required, so that this method is extremely tedious and very cost-intensive. In particular, the success of this procedure depends on the skill and experience of the operator, so that specially trained specialists are required. When dressing with surface tools, a separate polishing correction tool must be made for each radius.
  • a dressing device known from DD-A5-294 451 has a rotatably mounted spindle for receiving a pot tool and a spindle for receiving the polishing tool to be dressed.
  • the latter can be adjusted laterally and in its angular position to the first spindle, so that a contact circle described by the dressing tool on the polishing tool engages exactly in the center of rotation of the polishing tool and the intersection of the two spindle axes lies in the origin of the functional radius of an optical functional surface to be produced with the polishing tool.
  • the polishing tool is fed against the dressing tool via an infeed until the surface on the polishing medium carrier is machined evenly. After the dressing process has ended, the polishing tool must also be remounted from the dressing machine to the polishing machine, which leads to unused downtimes.
  • the aim of the invention is to significantly improve and accelerate the polishing process of spherical lenses. Furthermore, a short processing time with high precision should be achieved without the need for repeated post-processing. Another important object of the invention is to minimize the effects of polishing tool wear on the polishing process.
  • a rotatingly driven tool spindle for receiving a polishing tool which can be moved along an axis by means of a feed drive, and with a workpiece spindle, which is rotatably mounted about an axis, for receiving the lens, which is carried out by means of a Feed drive can be moved into a machining position, and a relative pivoting about a transverse axis can be carried out between the polishing tool and the lens
  • a rotatably mounted tool spindle for receiving a dressing tool is provided parallel to the workpiece spindle.
  • the dressing of the polishing tool can thus be carried out within the polishing machine during the polishing process, which was previously not possible.
  • the polishing process interrupting conversion or changeover phases are omitted, so that the processing times are significantly reduced. This has an extremely favorable effect on the manufacturing costs.
  • the quality of the polished lenses is increased considerably, since previously inaccuracies in change have been completely eliminated.
  • the workpiece spindle and the tool spindle have a common feed drive, which above all offers structural advantages, e.g. a simplified frame and slide design.
  • the arrangement of the spindles at a fixed distance from each other according to claim 3 ensures a very good positioning accuracy of the polishing tool and the dressing tool.
  • the workpiece spindle carries a holder in the form of a membrane chuck, which is provided with a compressed air connection.
  • a holder in the form of a membrane chuck, which is provided with a compressed air connection.
  • the membrane can also be used to eject the lens. This enables easy handling of the lens holder and particularly careful handling of the polished lens so that it is not damaged.
  • the dressing tool is preferably a pot tool. This enables spherical surfaces to be machined particularly evenly and precisely. Pot tools have an extremely long service life.
  • claim 6 provides that the polishing tool is arranged at a fixed distance from the transverse axis, which offers machine advantages, in particular with regard to reproducibility of the settings.
  • the polishing tool according to claim 7 has a carrier for receiving a polishing agent carrier, which according to claim 8 is an approximately 0.5 mm thick foamed film made of crosslinked elastomeric polyurethane or according to claim 9 is an approximately 0.5 mm thick desmopane film.
  • a polishing agent carrier for pre-polishing, it is favorable if the polishing agent carrier, in accordance with claim 10, has diamond pellets with a plastic bond.
  • the polishing agent carriers are connected to the carrier by gluing, which can be a two-component adhesive according to claim 11. This ensures simple and easy handling of the polishing foils.
  • the method according to the invention for polishing spherical surfaces of lenses, in particular made of glass wherein a rotatingly driven polishing tool is moved along an axis and a held lens rotatably mounted about an axis is moved into a processing position and wherein the polishing tool and lens perform a relative pivoting about a transverse axis , characterized in that the polishing tool is dressed before and / or after a polishing process without changing the position.
  • a rotary driven dressing tool is used to dress the polishing tool, the axis of rotation of which runs parallel to that of the polishing tool. This enables a simple and robust mechanical construction of the polishing machine, in particular the tool and workpiece holders.
  • polishing results are achieved if, according to claim 15, the polishing tool is approximated to an optimal ball radius by means of the dressing tool. It is advantageous, as provided in claim 16, to move the polishing tool and dressing tool with the same direction of rotation and, according to claim 17, to maintain the speeds or the speed differences of the spindles in a controlled manner.
  • Claim 20 provides that the lens is pressed against the polishing tool by compressed air during processing. In this way, the contact pressure and thus the abrasion of the polishing tool can be optimally controlled.
  • the contact pressure can be adapted to the polishing foils and polishing agents used.
  • a polishing agent is introduced between the polishing tool and the lens, which according to claim 24 is preferably composed of cerium oxide (CeO 2 ) in aqueous solution.
  • a further reduction in the machining time is achieved if the geometric properties of the polished lens are checked within the machine.
  • a polishing device designated overall by 10 in FIG. 1, is constructed on the basis of a CNC machine tool and is equipped with highly dynamic servomotors (not shown). Interpolators, not shown, ensure that the tool guide in the finest steps - i.e. the machining contour quasi-continuous - can be controlled and thus guarantees the production of precisely polished surfaces. In particular, compensating movements can be taken into account by numerically controlling feed drives.
  • FIG. 1 schematically shows the modular basic structure of the polishing device 10.
  • a CNC polishing machine it has an operating panel B, preferably with a screen, and an input part E, which can be designed as a keyboard.
  • Both units B, E are connected to a microprocessor computer R which carries out the calculation of the machining contours and forwards the necessary control commands to a control unit S for controlling axes X, Y, Z.
  • the lens parameters required for calculating the machining contour are entered either via the keyboard or via a suitable (not shown) data interface.
  • the movements of the individual CNC axes X, Y, Z are monitored with the aid of precision measuring systems M1, M2, M3, which are connected to the computer R, so that necessary corrections can be passed on to the control unit S immediately. Deviations from the default values can immediately be converted into correction specifications that control a corresponding dressing process of the polishing tool.
  • a suitable polishing device 10 has a frame 12 with a table surface 14 on which a horizontal frame 16 is arranged.
  • a slide 17 with a housing 19 is slidably mounted thereon.
  • a head 20 is connected to the housing 19 and contains a belt drive 21 and supports a tool spindle 30 driven by a motor 23.
  • a carriage 25 is arranged on a vertical frame 24, which has a rotary drive 28 for two rotation spindles 40, 41 held in parallel on the carriage 25.
  • the first spindle 40 carries a receiving device 42 for a lens L, the second spindle 41 a holder 43 for a dressing tool 50 (see FIGS. 2 and 3). It is easily possible to exchange the positions of the spindles 40, 41 with one another, so that the spindle 40 carries the dressing tool 50 and the spindle 41 carries the lens L to be polished.
  • a holder 31 is fastened to the tool spindle 30 and receives a polishing tool 32.
  • This has a carrier 33 with a polishing agent carrier 34, e.g. a foamed sheet made of cross-linked elastomeric polyurethane with a thickness of at least 0.5 mm.
  • a polishing agent carrier 34 e.g. a foamed sheet made of cross-linked elastomeric polyurethane with a thickness of at least 0.5 mm.
  • Such films have a high tensile strength with a high resistance to breakage and have a good recovery behavior, which is very important for use as a polishing film. In addition, they have good damping properties and good adhesion to metals.
  • the film can also be thicker than 0.5 mm, e.g. up to 1 mm.
  • the carriage 17 is movable in the direction of an axis X by means of a first feed drive 18.
  • a second feed drive 26 is provided for the slide 25, which enables movement in the direction of an axis Z.
  • the head 20 is pivotable about a transverse axis Y, for which a third feed drive 22 is used, which is arranged parallel to the axis X. It can be seen that by simply interacting the two linear drives 18, 26 in the direction of the axes X and Z, the tool spindle 30 with its polishing tool 32 can be moved either over the lens L on the holder 42 or over the dressing tool 50 on the holder 43.
  • the pivoting movement of the head 20 about the transverse axis Y in conjunction with the rotary movements of the spindles 30, 40, 41, the movements required for polishing the workpiece L and for dressing the polishing tool 32 can be generated without problems.
  • the lens L is clamped in the holding device 42.
  • This is a special membrane chuck with a rubber membrane (not shown) which can be pressurized with compressed air via a device (not shown).
  • the dressing tool 50 for example a special cup dressing tool, is inserted into the holder 43 of the spindle 41. Lens L and dressing tool 50 are moved into their working position by means of the feed drive 28. The data parameters required for lens processing are then called up so that computer R can determine the required machining contour.
  • the polishing tool 32 already installed in the tool spindle 30 is now moved by means of the feed drives 18, 26 over the dressing tool 32 and dressed according to the required geometries.
  • the optimally prepared polishing tool 32 then moves into the working position above the first spindle 40 with the lens L to be polished.
  • the polishing process can now be carried out simply or using the menu-guided segment correction technique.
  • a polishing agent is introduced between lens L and polishing tool 32 by means of a feed device (not shown), the selection and mixing of which depends on the glass material to be processed.
  • CeO 2 cerium oxide is preferably used in an aqueous solution.
  • an optimal contact pressure is exerted on the lens L via the rubber membrane (not shown), which is optimally adapted by the process computer R and the control unit S by means of the compressed air can.
  • the surface of the lens L can be measured outside the machine 10 or, if a suitable measuring technique is installed, also inside the machine 10. Geometry errors found are then transmitted to the computer R either via the input part E or via the data interface. The latter transmits the correction data to the control unit S, which moves the polishing tool 32 again via the dressing tool 50 by means of the CNC axes X, Y, Z. The tool 32 is optimally dressed in accordance with the correction specifications.
  • polishing agent carriers, polishing agents or glass material are stored in a memory (not shown) and can be called up at any time. In this way, many different surface geometries can be produced effectively and with extremely precise reproducibility; Even unusual surface structures can be easily produced between two lens series without having to carry out complex retrofitting work. After the polishing tool has been corrected, the final polishing process or a subsequent lens in this series is polished.
  • the invention is not limited to one of the above-described embodiments, but can be modified in many ways.
  • Particular advantages can result if the polishing device 10 described above is also used as a slanting device. All that needs to be done is to polish the tool 32 with a grinding tool, e.g. a pot tool, are exchanged and a corresponding grinding program is loaded into the microprocessor computer R, which is possible at any time without any problems due to the derivative software used.
  • the tool spindle 41 arranged parallel to the workpiece spindle 40, the pot tool can also be reworked within the machine 10 if required.
  • the precisely ground lens L will then be polished on the retooled machine 10.
  • the entire production process for producing a lens series can be carried out on a single machine, which is particularly advantageous for small businesses in terms of low acquisition costs for grinding and polishing machines.
  • a device 10 for polishing glass lenses L as a CNC machine tool has a feed drive 18 with a rotatingly driven tool spindle 30 for receiving a polishing tool 32.
  • a relative pivoting can be carried out between the polishing tool 32 and the lens L or the dressing tool 50.
  • the polishing tool has a carrier 33 for receiving a polishing agent carrier 34, which is preferably a polyurethane film. Before and / or after a polishing process, it is dressed in a microprocessor-controlled manner without changing the position, polishing tool 32 and dressing tool 50 being moved in the same direction of rotation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
EP19950101961 1995-02-14 1995-02-14 Appareil pour polir des lentilles sphériques Revoked EP0727280B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP19950101961 EP0727280B1 (fr) 1995-02-14 1995-02-14 Appareil pour polir des lentilles sphériques
DE59500684T DE59500684D1 (de) 1995-02-14 1995-02-14 Vorrichtung zum Polieren sphärischer Linsenoberfläche
DE29520993U DE29520993U1 (de) 1995-02-14 1995-02-14 Vorrichtung zum Polieren sphärischer Linsenoberflächen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19950101961 EP0727280B1 (fr) 1995-02-14 1995-02-14 Appareil pour polir des lentilles sphériques

Publications (2)

Publication Number Publication Date
EP0727280A1 true EP0727280A1 (fr) 1996-08-21
EP0727280B1 EP0727280B1 (fr) 1997-09-17

Family

ID=8218975

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950101961 Revoked EP0727280B1 (fr) 1995-02-14 1995-02-14 Appareil pour polir des lentilles sphériques

Country Status (2)

Country Link
EP (1) EP0727280B1 (fr)
DE (2) DE59500684D1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19737216A1 (de) * 1997-08-27 1999-03-04 Schneider Gmbh & Co Kg Verfahren zum Abrichten von Polierwerkzeugen mittels punktförmig angreifendem Werkzeug und zum Polieren von optischen Linsen sowie Zweispindel-Polier- und Abrichtmaschine zur Durchführung des Verfahrens
EP0937542A1 (fr) * 1998-02-23 1999-08-25 Schneider GmbH + Co. KG Procédé pour polir des lentilles et dispositif de polissage avec plusieurs mandrins et outils pour mettre en oeuvre ce procédé
EP0916448A3 (fr) * 1997-11-14 2001-02-07 Optotech Optikmaschinen GmbH Procédé et dispositif pour polir les deux faces de lentilles optiques
WO2006034695A1 (fr) * 2004-09-30 2006-04-06 Asphericon Gmbh Procede pour polir, en particulier, des surfaces de faces optiquement actives, telles que des lentilles
CN102601702A (zh) * 2011-01-24 2012-07-25 宝山钢铁股份有限公司 剖分轴承座内球面的加工方法
DE102016125206A1 (de) * 2016-12-21 2018-06-21 Thielenhaus Technologies Gmbh Verfahren und Maschine zum Endbearbeiten eines sphärisch gekrümmten Oberflächenabschnitts eines Werkstückes mittels eines Finishwerkzeuges, sowie ein Abrichtwerkzeug für das Finishwerkzeug
EP4559622A1 (fr) 2023-11-24 2025-05-28 Roland Mandler GmbH & Co. KG Dispositif de polissage de surfaces sphériques de lentilles et procédé de polissage de surfaces sphériques de lentilles
EP4706886A1 (fr) 2024-09-09 2026-03-11 Roland Mandler GmbH & Co. KG Dispositif de polissage de lentille optique ou de miroir optique et procédé de polissage de lentille optique ou de miroir optique

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19737215A1 (de) * 1997-08-27 1999-03-04 Schneider Gmbh & Co Kg Werkzeugkomibation bestehend aus Spannwerkzeug für Linsen und Abrichtwerkzeug für Polierwerkzeuge
DE19737217A1 (de) * 1997-08-27 1999-03-04 Schneider Gmbh & Co Kg Kombiwerkzeug zum Grob- und Feinschleifen optischer Linsen mit zwei Werkzeugen an einer Werkzeugspindel
DE19910534B4 (de) * 1998-03-14 2005-06-30 Schneider Gmbh + Co. Kg Verfahren zum Feststellen des Berührens eines Werkzeugs und eines Werkstücks einer optischen Maschine
AU2001237285A1 (en) 2000-02-03 2001-08-14 Carl Zeiss Polishing head for a polishing machine
DE102012206473A1 (de) 2012-04-19 2013-10-24 WZR ceramic solutions GmbH Polierverfahren
DE102013005573B3 (de) * 2013-04-03 2014-07-17 Universität Bremen Verfahren und Vorrichtung zum Herstellen eines Schleifkörpers und ein solcher Schleifkörper
DE102024129881A1 (de) * 2024-10-15 2026-04-16 Kern Microtechnik Gmbh Verfahren zur Herstellung eines Polierstiftes, Polierstift, Verfahren zur Bearbeitung eines Werkstückes mit diesem Polierstift, hiermit ausgestattete Werkzeugmaschine und Bearbeitungszentrum, sowie Computerprogrammprodukt

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3932197A1 (de) * 1988-10-20 1990-04-26 Olympus Optical Co Schleif- und nachbearbeitungseinrichtung sowie verfahren zum schleifen und nachbehandeln
DE4021722A1 (de) * 1989-07-10 1991-01-24 Olympus Optical Co Schleifvorrichtung
DD294451A5 (de) * 1990-04-04 1991-10-02 Carl Zeiss Jena Gmbh,De Vorrichtung zum abrichten von polierwerkzeugen mit synthetischen poliermitteltraegern
DE4108740A1 (de) * 1991-03-18 1992-09-24 Buderus Schleiftechnik Automatisch gesteuerte schleifmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3932197A1 (de) * 1988-10-20 1990-04-26 Olympus Optical Co Schleif- und nachbearbeitungseinrichtung sowie verfahren zum schleifen und nachbehandeln
DE4021722A1 (de) * 1989-07-10 1991-01-24 Olympus Optical Co Schleifvorrichtung
DD294451A5 (de) * 1990-04-04 1991-10-02 Carl Zeiss Jena Gmbh,De Vorrichtung zum abrichten von polierwerkzeugen mit synthetischen poliermitteltraegern
DE4108740A1 (de) * 1991-03-18 1992-09-24 Buderus Schleiftechnik Automatisch gesteuerte schleifmaschine

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19737216A1 (de) * 1997-08-27 1999-03-04 Schneider Gmbh & Co Kg Verfahren zum Abrichten von Polierwerkzeugen mittels punktförmig angreifendem Werkzeug und zum Polieren von optischen Linsen sowie Zweispindel-Polier- und Abrichtmaschine zur Durchführung des Verfahrens
EP0916448A3 (fr) * 1997-11-14 2001-02-07 Optotech Optikmaschinen GmbH Procédé et dispositif pour polir les deux faces de lentilles optiques
EP0937542A1 (fr) * 1998-02-23 1999-08-25 Schneider GmbH + Co. KG Procédé pour polir des lentilles et dispositif de polissage avec plusieurs mandrins et outils pour mettre en oeuvre ce procédé
WO2006034695A1 (fr) * 2004-09-30 2006-04-06 Asphericon Gmbh Procede pour polir, en particulier, des surfaces de faces optiquement actives, telles que des lentilles
US7854645B2 (en) 2004-09-30 2010-12-21 Asphericon Gmbh Method for polishing
CN102601702A (zh) * 2011-01-24 2012-07-25 宝山钢铁股份有限公司 剖分轴承座内球面的加工方法
CN102601702B (zh) * 2011-01-24 2014-03-05 宝山钢铁股份有限公司 剖分轴承座内球面的加工方法
DE102016125206A1 (de) * 2016-12-21 2018-06-21 Thielenhaus Technologies Gmbh Verfahren und Maschine zum Endbearbeiten eines sphärisch gekrümmten Oberflächenabschnitts eines Werkstückes mittels eines Finishwerkzeuges, sowie ein Abrichtwerkzeug für das Finishwerkzeug
DE102016125206B4 (de) 2016-12-21 2022-08-18 Thielenhaus Technologies Gmbh Verfahren und Maschine zum Endbearbeiten eines sphärisch gekrümmten Oberflächenabschnitts eines Werkstückes mittels eines Finishwerkzeuges, sowie ein Abrichtwerkzeug für das Finishwerkzeug
EP4559622A1 (fr) 2023-11-24 2025-05-28 Roland Mandler GmbH & Co. KG Dispositif de polissage de surfaces sphériques de lentilles et procédé de polissage de surfaces sphériques de lentilles
EP4706886A1 (fr) 2024-09-09 2026-03-11 Roland Mandler GmbH & Co. KG Dispositif de polissage de lentille optique ou de miroir optique et procédé de polissage de lentille optique ou de miroir optique

Also Published As

Publication number Publication date
EP0727280B1 (fr) 1997-09-17
DE59500684D1 (de) 1997-10-23
DE29520993U1 (de) 1996-11-07

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