EP0123891A2 - Verfahren zum Formen einer Sammellinse in einer Platte aus einem transparenten, mineralischen Material - Google Patents

Verfahren zum Formen einer Sammellinse in einer Platte aus einem transparenten, mineralischen Material Download PDF

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Publication number
EP0123891A2
EP0123891A2 EP84103309A EP84103309A EP0123891A2 EP 0123891 A2 EP0123891 A2 EP 0123891A2 EP 84103309 A EP84103309 A EP 84103309A EP 84103309 A EP84103309 A EP 84103309A EP 0123891 A2 EP0123891 A2 EP 0123891A2
Authority
EP
European Patent Office
Prior art keywords
grinding wheel
lens
axis
radius
diameter
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
EP84103309A
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English (en)
French (fr)
Other versions
EP0123891A3 (en
EP0123891B1 (de
Inventor
Claude-Michel Juvet
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.)
Comadur SA
Original Assignee
Comadur 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 Comadur SA filed Critical Comadur SA
Publication of EP0123891A2 publication Critical patent/EP0123891A2/de
Publication of EP0123891A3 publication Critical patent/EP0123891A3/fr
Application granted granted Critical
Publication of EP0123891B1 publication Critical patent/EP0123891B1/de
Expired 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
    • 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
    • B24B13/04—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor grinding of lenses involving grinding wheels controlled by gearing

Definitions

  • the present invention relates to a method for forming a converging lens in a plate of a transparent mineral material.
  • the object of the invention is to provide a method for manufacturing plates of transparent mineral material provided with a lens, without excess thickness and without risk of delamination.
  • This object is achieved by making the lens by grinding the plate, but this grinding is not carried out using a grinding wheel whose diameter and radius of curvature correspond to the diameter and radius of curvature of the lens because this causes faster wear of the periphery of the grinding wheel than of its central part.
  • the Applicant has in fact surprisingly found that, if a grinding wheel is used whose active part has a diameter less than the diameter of the lens, and that a relative oscillation movement is created between the grinding wheel and the plate, the period between two sharpenings of the grinding wheel is significantly increased.
  • the oscillating movement has the sole function of ensuring the self-sharpening of the grinding wheel. If, on the other hand, the arc embraced by the active part of the grinding wheel is less than half of the arc embraced by the lens, the rotational movement of the plate cannot be sufficient to machine the entire surface of the lens. To guarantee this machining, the oscillation angle must be at least equal to the angle corresponding to the difference between half of the arc embraced by the lens and the arc embraced by the active part of the grinding wheel.
  • the device shown in Figure 1 comprises a support frame 10 on which are mounted a bracket 12 and a headstock 14.
  • the bracket 12 carries a pin 16 at the end of which is fixed a cylindrical grinding wheel 20, of the same axis as the spindle and carrying, at its active end 20a, abrasive material, preferably consisting of diamond powder.
  • a pulley 18, mounted on the spindle 16, makes it possible to drive the latter in rotation by means of a motor not shown.
  • the bracket 12 further comprises slides 22, 24 and 26 allowing, in a completely conventional manner, the movement of the grinding wheel 20 along three orthogonal axes. More specifically, the slide 22 allows, using a micrometric screw 23, to move the grinding wheel vertically along its axis, while the slides 24 and 26 allow, using the micrometric screws 25 and 27 respectively , to move the grinding wheel horizontally in two perpendicular directions.
  • the headstock 14 carries a spindle 28 whose end 28a adjacent to the bracket 12 is, by virtue of an elbow 28b, offset downward relative to the axis of rotation of the spindle.
  • a table 30 is mounted on a shaft 32 which is perpendicular to the axis of the spindle 28 and which pivots in the end 28a. This shaft carries a pulley 34 which allows it to rotate, thanks to a motor not shown in the figure.
  • a fitting 36, integral with the table 30, makes it possible to fix a plate 38, made of transparent mineral material, such as a watch glass, intended to be provided with a lens.
  • the fitting 36 has a thickness such that the distance between the upper face of the plate 38 and the axis of the spindle 28 is equal to the radius of curvature R that the lens should have.
  • the spindle 28 is associated with drive means, not shown, allowing it to impart an oscillating movement of low amplitude.
  • the active part 20a of the grinding wheel has, as shown in FIGS. 2a and 2b, a form of concave spherical cap, of radius equal to the radius of curvature of the lens.
  • the axis 40 of the shaft 32 and the axis 42 of the spindle 16 coincide when the plate 38 is horizontal ( Figure 2a). In the other positions of the plate, these two axes intersect the axis of the spindle 28, shown at 44 and form an angle a whose maximum value ⁇ max corresponds to the extreme positions of the plate.
  • the oscillating movement of the spindle 28 it is possible to increase the time between two sharpenings of the grinding wheel.
  • the oscillation movement is made possible by the fact that the diameter D of the lens is substantially greater than that of the grinding wheel.
  • the d / D ratio is between 1/3 and 2/3.
  • the relationship between the angle ⁇ max , the diameters D and d and the radius of curvature R can be expressed by the formula:
  • This relationship is used to define the maximum amplitude of bone movement cillation of the spindle, which makes it possible to produce, using a grinding wheel of given diameter, a lens of desired diameter and radius of curvature.
  • the angle ⁇ max is between 5 and 20 ° approximately.
  • the axes 40 and 42 of the shaft 32 and of the spindle 16 define a plane, coinciding with the plane of these figures and perpendicular to the axis 44 of spindle 28.
  • the axis 42 of spindle 16 is spaced from axis 44 by a value e.
  • the plate 38 is horizontal (FIG. 3a)
  • the axes of the spindle 16 and of the shaft 32 are parallel.
  • the two axes form an angle a, whose maximum value ⁇ max is obtained when the spindle 28 is at its maximum oscillation (FIG. 3b).
  • (de) is typically between D / 3 and 2D / 3, which means that the angle ⁇ max is, here too, between 5 ° and 20 °.
  • the shape of the end 20a of the grinding wheel is, in this case, a part of a torus whose radius of the generating circle is equal to the radius of curvature R of the lens and whose distance between the generating axis and the center of the circle generator is equal to e.
  • This mode of operation allows the use of a wheel of larger diameter, hence an increase in its service life, due to lower wear.
  • the adjustment of the device is however more delicate.
  • the rules relating to the minimum amplitude of the oscillation are also applicable in this variant, with the difference that for the same diameter, the arc embraced by the active part of the grinding wheel is substantially equal to half of that corresponding to the first variant, because the active part has the shape of a torus part and no longer a sphere cap.
  • connection cone would have a large angle at the top, which would be unsightly.
  • This drawback can be eliminated by using a grinding wheel whose active part 20a, in the shape of a torus part, is connected to the body of the grinding wheel by a truncated cone 20b whose angle at the top is equal to 2 a max .
  • the parts 20a and 20b can be produced independently of the body of the grinding wheel, then fixed to the latter by conventional connecting means. Thanks to the fact that the angle ⁇ max is large, the central zone of the part of the concave torus is prominent and can thus easily be truncated to allow access to the assembly means not shown in the drawing.
  • the oscillation movement is imposed on the table carrying the plate. It goes without saying that if it is the grinding wheel which oscillates, around the same axis 44, the effect obtained is identical.
  • This process lends itself particularly well to the machining of sapphire plates, but also to other materials, such as mineral glass for example.
EP84103309A 1983-03-31 1984-03-26 Verfahren zum Formen einer Sammellinse in einer Platte aus einem transparenten, mineralischen Material Expired EP0123891B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1800/83 1983-03-31
CH1800/83A CH651773A5 (fr) 1983-03-31 1983-03-31 Procede pour former une lentille convergente dans une plaque d'un materiau mineral transparent.

Publications (3)

Publication Number Publication Date
EP0123891A2 true EP0123891A2 (de) 1984-11-07
EP0123891A3 EP0123891A3 (en) 1986-02-05
EP0123891B1 EP0123891B1 (de) 1988-05-18

Family

ID=4218896

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84103309A Expired EP0123891B1 (de) 1983-03-31 1984-03-26 Verfahren zum Formen einer Sammellinse in einer Platte aus einem transparenten, mineralischen Material

Country Status (6)

Country Link
US (1) US4584799A (de)
EP (1) EP0123891B1 (de)
JP (1) JPS59187449A (de)
CH (1) CH651773A5 (de)
DE (1) DE3471270D1 (de)
SG (1) SG38991G (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0257013A2 (de) * 1986-08-19 1988-02-24 Léon Biebuyck Verfahren und Vorrichtung zum mechanischen Schleifen und Polieren der Fläche eines mineralischen Materials, insbesondere aus Glas
US6406769B1 (en) 1998-04-02 2002-06-18 Comadur S.A. Watch crystal including a lens and manufacturing method for such a lens
KR101277818B1 (ko) * 2006-01-25 2013-06-21 구알라 크로져 에스.피.에이. 고가의 음료를 보관하는 병을 위한 개봉 증명 마개
EP1567305B1 (de) * 2002-11-26 2014-04-16 Comadur S.A. Verfahren zur formung einer optischen fläche

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62114866A (ja) * 1985-11-08 1987-05-26 Matsushita Electric Ind Co Ltd 非球面加工機
US4956944A (en) * 1987-03-19 1990-09-18 Canon Kabushiki Kaisha Polishing apparatus
JPH0659613B2 (ja) * 1988-10-20 1994-08-10 オリンパス光学工業株式会社 研削研磨装置及び研削研摩方法
JP4288012B2 (ja) * 2001-01-05 2009-07-01 株式会社ニデック 眼鏡レンズ加工装置
US7083326B2 (en) * 2004-09-13 2006-08-01 Ast Ryan C Adjustable watch crystal apparatus
KR101764109B1 (ko) 2012-02-16 2017-08-03 애플 인크. 강성 재료로부터 형성되는 인터로킹 가요성 세그먼트
US10086484B2 (en) 2012-10-12 2018-10-02 Apple Inc. Manufacturing of computing devices
JP6006144B2 (ja) * 2013-02-27 2016-10-12 オリンパス株式会社 レンズ加工装置、レンズ加工方法、及びレンズ加工用工具
DE102014003598B4 (de) * 2014-03-17 2020-02-27 Satisloh Ag Vorrichtung zum Schleifen, Feinschleifen und/oder Polieren von Werkstücken in optischer Qualität, insbesondere von sphärischen Linsenflächen in der Feinoptik
US9852723B2 (en) 2014-03-27 2017-12-26 Apple Inc. Acoustic modules
CN205115306U (zh) 2014-09-30 2016-03-30 苹果公司 陶瓷部件
US10071539B2 (en) 2014-09-30 2018-09-11 Apple Inc. Co-sintered ceramic for electronic devices
US10207387B2 (en) 2015-03-06 2019-02-19 Apple Inc. Co-finishing surfaces
US10216233B2 (en) 2015-09-02 2019-02-26 Apple Inc. Forming features in a ceramic component for an electronic device
US10542628B2 (en) 2017-08-02 2020-01-21 Apple Inc. Enclosure for an electronic device having a shell and internal chassis

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1491383A (en) * 1921-05-31 1924-04-22 American Optical Corp Lens-grinding apparatus
US1563918A (en) * 1922-08-02 1925-12-01 American Optical Corp Method of grinding lenses
US2087687A (en) * 1934-07-27 1937-07-20 Daniel D Hubbell Apparatus for producing one-piece multifocal ophthalmic lenses
DE806532C (de) * 1949-04-21 1951-06-14 Fabrication Belge De Lentilles Einrichtung zum Schleifen von Kugelflaechen, insbesondere von optischen Linsen
US3905163A (en) * 1974-03-06 1975-09-16 Tropel Lens making method

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1515681A (en) * 1919-05-02 1924-11-18 American Optical Corp Lens grinder
GB449398A (en) * 1934-12-21 1936-06-22 James Alfred Moore Improvements in the process of grinding curved surfaces, and apparatus therefor
US2336322A (en) * 1940-02-23 1943-12-07 Uhlemann Optical Co Of Illinoi One-piece plurifocal lens
FR977720A (fr) * 1942-10-21 1951-04-04 Verreries De Bagneaux Et Apper Procédé et appareil pour le surfaçage de corps sphériques, en particulier de verres d'optique
US2747339A (en) * 1954-01-18 1956-05-29 Bausch & Lomb Lens grinding machine
US2975565A (en) * 1957-10-29 1961-03-21 Edward H Phillips Machine for grinding and polishing lenses
US2977724A (en) * 1959-08-24 1961-04-04 Textron Inc Lens surfacing machine
SU865619A1 (ru) * 1980-01-07 1981-09-23 Предприятие П/Я Г-4671 Способ обработки асферических поверхностей оптических деталей
CA1201579A (en) * 1981-03-05 1986-03-11 Yoshiaki Nagaura Lens-shaped article or the like and a method and apparatus for the manufacture of the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1491383A (en) * 1921-05-31 1924-04-22 American Optical Corp Lens-grinding apparatus
US1563918A (en) * 1922-08-02 1925-12-01 American Optical Corp Method of grinding lenses
US2087687A (en) * 1934-07-27 1937-07-20 Daniel D Hubbell Apparatus for producing one-piece multifocal ophthalmic lenses
DE806532C (de) * 1949-04-21 1951-06-14 Fabrication Belge De Lentilles Einrichtung zum Schleifen von Kugelflaechen, insbesondere von optischen Linsen
US3905163A (en) * 1974-03-06 1975-09-16 Tropel Lens making method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0257013A2 (de) * 1986-08-19 1988-02-24 Léon Biebuyck Verfahren und Vorrichtung zum mechanischen Schleifen und Polieren der Fläche eines mineralischen Materials, insbesondere aus Glas
EP0257013B1 (de) * 1986-08-19 1992-01-02 Léon Biebuyck Verfahren und Vorrichtung zum mechanischen Schleifen und Polieren der Fläche eines mineralischen Materials, insbesondere aus Glas
US6406769B1 (en) 1998-04-02 2002-06-18 Comadur S.A. Watch crystal including a lens and manufacturing method for such a lens
EP1567305B1 (de) * 2002-11-26 2014-04-16 Comadur S.A. Verfahren zur formung einer optischen fläche
KR101277818B1 (ko) * 2006-01-25 2013-06-21 구알라 크로져 에스.피.에이. 고가의 음료를 보관하는 병을 위한 개봉 증명 마개

Also Published As

Publication number Publication date
US4584799A (en) 1986-04-29
DE3471270D1 (en) 1988-06-23
EP0123891A3 (en) 1986-02-05
CH651773A5 (fr) 1985-10-15
JPS59187449A (ja) 1984-10-24
EP0123891B1 (de) 1988-05-18
SG38991G (en) 1991-07-26

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