EP0947895B1 - Uhrglas mit einer Linse und Verfahren zur Herstellung einer solchen Linse - Google Patents

Uhrglas mit einer Linse und Verfahren zur Herstellung einer solchen Linse Download PDF

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Publication number
EP0947895B1
EP0947895B1 EP98106048A EP98106048A EP0947895B1 EP 0947895 B1 EP0947895 B1 EP 0947895B1 EP 98106048 A EP98106048 A EP 98106048A EP 98106048 A EP98106048 A EP 98106048A EP 0947895 B1 EP0947895 B1 EP 0947895B1
Authority
EP
European Patent Office
Prior art keywords
lens
crystal
recess
glass
watch
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
EP98106048A
Other languages
English (en)
French (fr)
Other versions
EP0947895A1 (de
Inventor
Guy Delabre
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
Priority to DE69827768T priority Critical patent/DE69827768D1/de
Priority to EP98106048A priority patent/EP0947895B1/de
Priority to US09/275,403 priority patent/US6406769B1/en
Priority to CN99104715A priority patent/CN1230706A/zh
Priority to JP11096278A priority patent/JP2000065960A/ja
Publication of EP0947895A1 publication Critical patent/EP0947895A1/de
Application granted granted Critical
Publication of EP0947895B1 publication Critical patent/EP0947895B1/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
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • B24B1/04—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes subjecting the grinding or polishing tools, the abrading or polishing medium or work to vibration, e.g. grinding with ultrasonic frequency
    • 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
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B39/00—Watch crystals; Fastening or sealing of crystals; Clock glasses
    • G04B39/008—Watch crystals; Fastening or sealing of crystals; Clock glasses with means for magnified reading
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/21—Circular sheet or circular blank
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/21—Circular sheet or circular blank
    • Y10T428/216—Ornamental, decorative, pattern, or indicia
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/21—Circular sheet or circular blank
    • Y10T428/219—Edge structure

Definitions

  • the present invention relates to a watch crystal comprising an optical lens shaped in the thickness ice material, as well as a method of manufacture of such a lens.
  • the lens is protruding on the upper face or the lower face of the glass, its shape can be arbitrary.
  • the lens can then be made of a block with the ice if it is produced by molding, for example of a material synthetic such as PMMA.
  • the ice is made of a hard material such as sapphire, which is difficult to machine and polish, such a protruding lens is usually made separately, then glued to the ice cream. This presents mounting difficulties and risks of delamination during use.
  • the lenses protruding are exposed to wear and shock if they are on the outside of the glass, or have a annoying bulk vis-à-vis the watch hands if they are on the inside.
  • Patent EP 0 123 891 describes a process for forming such a lens in a plate mineral matter, especially sapphire, by machining with by means of a rotary grinding wheel with an oscillating movement of the grinding wheel or plate. In practice, this process does not only suitable for the production of circular lenses.
  • Another construction consists in separately manufacturing the lens and the plate intended to form the ice, to spare in the thickness of the plate a blind housing having a depth substantially equal to the thickness of the lens, then fix the lens in this housing.
  • the plate and the lens can be in particular glass, spinel, corundum or sapphire. This has the advantage to allow a non-circular shape of the lens, by example an elongated shape to facilitate the reading of a indication in a rectangular window.
  • the manufacturing process remains rather complicated, in particular because you have to machine and polish the recess in addition to two sides of the lens, and the risk of the lens remains.
  • the present invention aims to avoid the drawbacks mentioned above, in particular with glasses and lenses in hard material, by making a simple watch crystal, resistant and attractive.
  • a basic idea of the invention consists in making a corundum, sapphire or spinel watch glass, comprising an optical lens shaped in the thickness of ice material, this lens having a non-circular periphery.
  • the periphery may have re-entrant angles and may be for example rectangular.
  • another aspect of the invention relates to a method for manufacturing an optical lens non-circular in the thickness of a watch glass in hard mineral matter, especially of corundum, sapphire or spinel, characterized in that it comprises the stages successive consisting of forming by machining in one face ice, a recess with a non-circular periphery, the recess having side walls and a curved bottom intended to constitute a surface of the lens, and to polish at least the bottom of the recess using a brush back and forth to strike the bottom, with the addition of a polishing agent.
  • Machining can be carried out for example by ultrasound by means of a sonotrode, or by etching by means of a rotary tool.
  • the brush can be animated, in addition to its back and forth movement, of a transverse movement, for example thanks to a rotation about a substantially perpendicular axis ice and located away from the lens.
  • Watch glass 1 shown in Figures 1 and 3 is made of a hard transparent crystalline material of the corundum family, for example sapphire or spinel. It can have any shape in plan, which is a barrel shape in this case as well that in elevation, for example a flat, domed or facets.
  • Figure 3 shows a case where the face upper 2 and the lower face 3 of the glass are planar.
  • a rectangular converging lens 4 is made in the thickness of the material of the ice 1, its shape being determined by a recess 5 formed in the underside 3 of the ice. This recess presents side walls 6 around its periphery and a curved bottom 7 constituting the lower surface of the lens 4.
  • the upper surface 8 of the lens is formed directly by the upper face 2 of the glass.
  • lens 4 has a shape particularly elongated rectangular, allowing read for example a date indicated in the form of the day of the week and the calendar.
  • the surface domed lower 7 of the lens will preferably have a cylindrical shape.
  • Figure 2 shows an example of a mirror 11 in the thickness of which a lens is formed spherical 12 having a non-circular plane shape any, allowing to obtain aesthetic effects individuals.
  • the periphery of the lens 12 may have in particular straight sides 13, curved sides 14 and inside corners 15. The watch designer has thus greater freedom of choice.
  • Glass 1 and its lens 4 can be produced as follows. Before making the lens, we can make ice 1 by conventional methods machining and polishing the material from which it is made. However, note that the polishing of its underside can be done at least partially after machining the lens, that is to say at the same time as the polishing of the curved face 7 of the lens.
  • Machining for lens shaping 4 consists in digging the recess 5 in the face 3 of the ice by any suitable technique.
  • a technique preferred is that of ultrasonic machining using of a sonotrode 20 as shown in FIG. 4, the ultrasonic vibration being represented by the double arrow 21.
  • the glass 1 is placed upside down on an anvil 22.
  • the end 23 of the sonotrode has a shape three-dimensional which corresponds to the desired final shape of the recess 5.
  • the sonotrode 20 is filled with diamond and a liquid is also injected loaded with diamond powder through 24 conduits to the end of the sonotrode. This machining produces a recess 5 whose surfaces are matt and whose side walls 6 are substantially perpendicular to the side 3 of the ice.
  • Another machining method that can be used to form the recess 5 is that of the engraving by means of a tool rotary such as a diamond cutter by copying from of a model. If the plan shape of the recess is present re-entrant angles, these will then be slightly rounded.
  • the side walls 6 can be inclined one way or the other compared to normal to the side 3.
  • a polishing agent such as a paste or a liquid (especially oil or beeswax) loaded with diamond powder is applied to the ice, by example by injection through brush 33.
  • a polishing agent such as a paste or a liquid (especially oil or beeswax) loaded with diamond powder is applied to the ice, by example by injection through brush 33.
  • the brush 33 also has a transverse displacement opposite each window, so that the bristles of the brush move relative to the surfaces to be polished.
  • this displacement is obtained simply by a rotation 38 around the axis 36 of the brush, this axis being located at a distance from the glass and lenses.
  • the process described above is characterized by a great simplicity, since the lens can be polished the same time as ice, and it provides lenses of any shape, shaped in the material ice itself.
  • This process is particularly advantageous compared to the manufacture of a lens added according to document EP 0 814 388, which required to machine and polish the two sides of the glass, the recess intended to receive the lens, as well than the two sides of the lens made separately. he also avoids the problems associated with adjusting the lens in its housing, sticking and the risk of peeling off.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Claims (10)

  1. Uhrenglas aus Korund, Saphir oder Spinell, mit einer optischen Linse (4, 12) mit nicht kreisförmigem Umfang,
       dadurch gekennzeichnet, dass die Linse (4, 12) in die Dicke des Materials des Glases (1, 11) eingearbeitet ist.
  2. Uhrenglas nach Anspruch 1, dadurch gekennzeichnet, dass der Umfang einspringende Ecken (15) aufweist.
  3. Uhrenglas nach Anspruch 1, dadurch gekennzeichnet, dass der Umfang rechtwinklig ist.
  4. Uhrenglas nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass eine (8) der Oberflächen der Linse durch eine Seite (2) des Glases gebildet ist und dass die andere Oberfläche (7) der Linse, die in der anderen Seite (3) des Glases angeordnet ist, eine sphärische oder zylindrische Form hat.
  5. Verfahren zur Herstellung einer nicht kreisförmigen optischen Linse (4) in der Dicke eines Uhrenglases (1) aus einem harten Mineralwerkstoff, insbesondere aus Korund, Saphir oder Spinell, dadurch gekennzeichnet, dass es die aufeinander folgenden Schritte umfasst, die darin bestehen:
    durch Bearbeiten in einer Seite des Glases eine Aussparung (5) mit nicht kreisförmigen Umfang zu bilden, wobei die Aussparung Seitenwände (6) und einen bombierten Boden (7), der dazu bestimmt ist, eine Oberfläche der Linse zu bilden, besitzt, und
    wenigstens den Boden der Aussparung mittels einer Bürste (33), die zu einer Hin- und Herbewegung (35) angetrieben wird, um den Boden zu klopfen, unter Hinzufügung eines Poliermittels zu polieren.
  6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass der Umfang einspringende Ecken aufweist.
  7. Verfahren nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Bürste (31) außerdem zu einer transversalen Bewegung angetrieben wird.
  8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass die transversale Bewegung der Bürste eine Drehung (38) um eine zu dem Glas im Wesentlichen senkrechte Achse (36), die sich in einem Abstand von der Linse befindet, umfasst.
  9. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass die maschinelle Bearbeitung durch Ultraschall mittels einer Sonotrode (20) ausgeführt wird, die ein Ende (23) besitzt, dessen Form im Wesentlichen der Form der Aussparung (5) entspricht.
  10. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass die maschinelle Bearbeitung durch Gravur mittels eines rotierenden Werkzeugs ausgeführt wird.
EP98106048A 1998-04-02 1998-04-02 Uhrglas mit einer Linse und Verfahren zur Herstellung einer solchen Linse Expired - Lifetime EP0947895B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE69827768T DE69827768D1 (de) 1998-04-02 1998-04-02 Uhrglas mit einer Linse und Verfahren zur Herstellung einer solchen Linse
EP98106048A EP0947895B1 (de) 1998-04-02 1998-04-02 Uhrglas mit einer Linse und Verfahren zur Herstellung einer solchen Linse
US09/275,403 US6406769B1 (en) 1998-04-02 1999-03-24 Watch crystal including a lens and manufacturing method for such a lens
CN99104715A CN1230706A (zh) 1998-04-02 1999-04-01 包含透镜的手表面玻璃及该透镜的制造方法
JP11096278A JP2000065960A (ja) 1998-04-02 1999-04-02 レンズを含む腕時計ガラス及びそのようなレンズの製造方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98106048A EP0947895B1 (de) 1998-04-02 1998-04-02 Uhrglas mit einer Linse und Verfahren zur Herstellung einer solchen Linse

Publications (2)

Publication Number Publication Date
EP0947895A1 EP0947895A1 (de) 1999-10-06
EP0947895B1 true EP0947895B1 (de) 2004-11-24

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP98106048A Expired - Lifetime EP0947895B1 (de) 1998-04-02 1998-04-02 Uhrglas mit einer Linse und Verfahren zur Herstellung einer solchen Linse

Country Status (5)

Country Link
US (1) US6406769B1 (de)
EP (1) EP0947895B1 (de)
JP (1) JP2000065960A (de)
CN (1) CN1230706A (de)
DE (1) DE69827768D1 (de)

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US10216233B2 (en) 2015-09-02 2019-02-26 Apple Inc. Forming features in a ceramic component for an electronic device
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US11535551B2 (en) 2016-09-23 2022-12-27 Apple Inc. Thermoformed cover glass for an electronic device
US10800141B2 (en) 2016-09-23 2020-10-13 Apple Inc. Electronic device having a glass component with crack hindering internal stress regions
US11565506B2 (en) 2016-09-23 2023-01-31 Apple Inc. Thermoformed cover glass for an electronic device
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EP3575888B1 (de) * 2018-05-30 2023-04-12 Rolex Sa Uhr umfassend eine asphärische linse
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Also Published As

Publication number Publication date
EP0947895A1 (de) 1999-10-06
DE69827768D1 (de) 2004-12-30
US6406769B1 (en) 2002-06-18
CN1230706A (zh) 1999-10-06
JP2000065960A (ja) 2000-03-03

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