EP0854403B1 - Durchsichtiges und kratzfestes Uhrenglas und ein mit diesem Glas versehenes Uhrengehäuse - Google Patents

Durchsichtiges und kratzfestes Uhrenglas und ein mit diesem Glas versehenes Uhrengehäuse Download PDF

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Publication number
EP0854403B1
EP0854403B1 EP97100591A EP97100591A EP0854403B1 EP 0854403 B1 EP0854403 B1 EP 0854403B1 EP 97100591 A EP97100591 A EP 97100591A EP 97100591 A EP97100591 A EP 97100591A EP 0854403 B1 EP0854403 B1 EP 0854403B1
Authority
EP
European Patent Office
Prior art keywords
watch
glass
glasses
polycrystalline diamond
same
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
EP97100591A
Other languages
English (en)
French (fr)
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EP0854403A3 (de
EP0854403A2 (de
Inventor
Michael Bach
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.)
Rado Uhren AG
Original Assignee
Rado Uhren 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 Rado Uhren AG filed Critical Rado Uhren AG
Priority to EP97100591A priority Critical patent/EP0854403B1/de
Priority to DE69733633T priority patent/DE69733633T2/de
Priority to AT97100591T priority patent/ATE298900T1/de
Publication of EP0854403A2 publication Critical patent/EP0854403A2/de
Publication of EP0854403A3 publication Critical patent/EP0854403A3/de
Application granted granted Critical
Publication of EP0854403B1 publication Critical patent/EP0854403B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • G04B39/004—Watch crystals; Fastening or sealing of crystals; Clock glasses from a material other than glass
    • G04B39/006—Watch crystals; Fastening or sealing of crystals; Clock glasses from a material other than glass out of wear resistant material, e.g. sapphire

Definitions

  • the present invention relates to a watch glass transparent and scratch-resistant, and in particular a glass of shows having a low cost regardless of the complexity of its shape, for example flat or spherical, while having a very high hardness, of the order of 98 GPa (10,000 HV).
  • the present invention also relates to a box of watch provided with such a glass.
  • Watch glasses for the protection of dials and needles or the like are made the most often made of synthetic material or mineral glass because of their relatively low cost price.
  • the respective hardness of these categories of materials determines of course the scratch resistance of the glasses.
  • a watch glass made of materials synthetic materials such as Plexiglas have a hardness Vickers of about 0.98 GPa (100) and mineral or natural glass has a Vickers hardness of about 8.8 GPa (900).
  • Gold experience showed that glasses made in these two categories of materials withstand scratches by some agents very hard, such as silica contained in dust, marble or sand constantly present in our environment, even if the mineral glass resists better to these aggressions than the synthetic materials. he This results in a relatively rapid alteration of the aesthetic appearance by stripes of these types of glasses or watch funds.
  • sapphire or artificial corundum for making glasses of shows.
  • Such glasses are described for example respectively in the patent CH 632 891 and in the patent FR 1 238 069.
  • These glasses are very resistant to attacks by external agents but the major disadvantage of being long, complex and laborious to manufacture and to have a very high cost price, this which greatly limits their use to very large ladder.
  • a medium-sized plant manufacture of sapphire "pears” consumes annually as much electricity as a city of about 50,000 inhabitants.
  • the object of the present invention is therefore precisely a scratchproof and transparent watch glass, characterized in that it is made of polycrystalline diamond.
  • the hardness of shows according to the invention is of the order of 98 GPa (10,000 HV) which makes them almost scratch-proof.
  • Diamond glasses polycrystalline of the invention also show the advantage of having excellent resistance to chemical aggressions.
  • the present invention also relates to a watch case comprising a case and a bottom, characterized in that it further comprises a glass which consists of polycrystalline diamond.
  • the box 10 includes a middle 16, a first and a second closure element of the box, respectively a glass 18 and a bottom 20, as well as a casing ring 22.
  • the middle 16 is provided with four horns 24 which extend above the body of the middle part and form claws 26 defining with the body of the middle part a slide inside which the glass 18 is housed.
  • the bottom 20 is attached to the middle part 16 by means of screws represented in the drawing. He also relies on the 22. The latter extends over the whole of height of the middle part 16 and it is in support against the 18.
  • the casing ring 22 exerts pressure on the glass 18 that leans on the claws 26.
  • the glass 18 is an element virtually scratch-resistant made of polycrystalline diamond.
  • the glass 18 can be obtained as follows. We first prepares a graphite substrate comprising an upper surface having the negative form of glass that one wishes to obtain. This negative form is plane in the case of the glass 18 but may well be heard non planar for example curved cylindrical, convex spherical or a combination of these forms.
  • the face substrate is polished and then coated with thin layer of silicon carbide (SiC).
  • SiC silicon carbide
  • a layer of polycrystalline diamond is then deposited on the layer of SiC by chemical vapor deposition. During this deposit operation a layer of polycrystalline diamond grows on the SiC surface to the desired thickness.
  • the polycrystalline diamond to form the glass 18 is then polished and, if necessary, put to the dimensions final to form a watch glass such as glass 18. This dimensioning step is for example performed by laser machining.
  • the polycrystalline diamond layer is finally disintegrated from the substrate, for example by elimination chemical substrate.
  • the glass thus produced is of course completely transparent in the visible spectrum after polishing and thus protects the display means while allowing their reading.
  • the thickness of the watch glass according to the invention is depending on the size of the desired glass and the effect obtain, it will generally be between 0.5 and 2 mm.
  • a method for obtaining a glass according to the invention such as glass 18 is described in more detail in the patent application EP-A-0 693 573. It is understood that any other process for obtaining plates or blades in polycrystalline diamond are conceivable.
  • the watch case has a upper shell 28 in the shape of a spherical cap, of which at least one part is transparent and forms a first watch glass according to the invention.
  • the box still has a lower shell 30, also shaped spherical cap, and a middle 32 disposed in the vicinity of the periphery of the shells 28 and 30, the lower shell 30 forming a second watch glass according to the invention.
  • the glasses 28 and 30 therefore have non-planar shapes.
  • the shells 28 and 30 define an interior space in which takes place a movement (not shown) and the middle part 32 is arranged to fit respectively the shape of the faces lower and upper than the shells upper 28 and lower 30 to serve them of support surface. So when the box is assembled, the edges 34 and 36 of the upper and lower shells are joined throughout their periphery with the exception of places 38 and 40 provided for attaching the strands of bracelet 42 and 44, and the middle part no longer appears.
  • the upper shell 28, the glass, and the lower shell 30, the bottom, forming the glasses scratchproof transparencies are made like glass described in conjunction with FIGS. 1 and 2.
  • the box thus produced is completely scratchproof.
  • the box thus obtained presents shock absorption characteristics that it can undergo because shocks are transmitted to the seat of shells located on the middle on which they are fixed, thus benefiting from the vault effect.
  • the two shells may have on the periphery of their inner face a masking layer such as a metallization for hide some elements of the box like the middle part.
  • Watch glasses could be used as transparent background for watch box.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Surface Treatment Of Glass (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Claims (6)

  1. Uhrenglas, das nicht verkratzt werden kann und lichtdurchlässig ist, dadurch gekennzeichnet, dass es aus polykristallinem Diamant verwirklicht ist.
  2. Uhrenglas nach Anspruch 1, dadurch gekennzeichnet, dass es eine nicht ebene Form aufweist.
  3. Uhrenglas nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass es sphärisch gewölbt ist.
  4. Uhrenglas nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass es zylindrisch gewölbt ist.
  5. Uhrenglas nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass es eine Dicke im Bereich von 0,5 bis 2 mm aufweist.
  6. Uhrengehäuse, das ein Gehäusemittelteil und einen Boden umfasst, dadurch gekennzeichnet, dass es außerdem wenigstens ein Glas nach einem der vorhergehenden Ansprüche umfasst.
EP97100591A 1997-01-16 1997-01-16 Durchsichtiges und kratzfestes Uhrenglas und ein mit diesem Glas versehenes Uhrengehäuse Expired - Lifetime EP0854403B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP97100591A EP0854403B1 (de) 1997-01-16 1997-01-16 Durchsichtiges und kratzfestes Uhrenglas und ein mit diesem Glas versehenes Uhrengehäuse
DE69733633T DE69733633T2 (de) 1997-01-16 1997-01-16 Durchsichtiges und kratzfestes Uhrenglas und ein mit diesem Glas versehenes Uhrengehäuse
AT97100591T ATE298900T1 (de) 1997-01-16 1997-01-16 Durchsichtiges und kratzfestes uhrenglas und ein mit diesem glas versehenes uhrengehäuse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97100591A EP0854403B1 (de) 1997-01-16 1997-01-16 Durchsichtiges und kratzfestes Uhrenglas und ein mit diesem Glas versehenes Uhrengehäuse

Publications (3)

Publication Number Publication Date
EP0854403A2 EP0854403A2 (de) 1998-07-22
EP0854403A3 EP0854403A3 (de) 1999-12-01
EP0854403B1 true EP0854403B1 (de) 2005-06-29

Family

ID=8226373

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97100591A Expired - Lifetime EP0854403B1 (de) 1997-01-16 1997-01-16 Durchsichtiges und kratzfestes Uhrenglas und ein mit diesem Glas versehenes Uhrengehäuse

Country Status (3)

Country Link
EP (1) EP0854403B1 (de)
AT (1) ATE298900T1 (de)
DE (1) DE69733633T2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITIM20030011A1 (it) * 2003-11-12 2005-05-13 Cosetta Schiavolini Particolare vetro per orologio, che permette

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1238069A (fr) * 1959-10-15 1960-11-30 Dalloz Freres Ets Perfectionnement aux verres de montres
CH554014A (de) * 1970-06-25 1974-09-13
CH632891GA3 (en) * 1979-09-12 1982-11-15 Process for producing a watch-glass

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4965864A (de) * 1972-10-24 1974-06-26
JPS5761644A (en) * 1980-10-02 1982-04-14 Seiko Epson Corp Cover glass having diamond coating layer and its preparation
CH659168GA3 (de) * 1985-04-16 1987-01-15
US5527559A (en) 1994-07-18 1996-06-18 Saint Gobain/Norton Industrial Ceramics Corp. Method of depositing a diamond film on a graphite substrate

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1238069A (fr) * 1959-10-15 1960-11-30 Dalloz Freres Ets Perfectionnement aux verres de montres
CH554014A (de) * 1970-06-25 1974-09-13
CH632891GA3 (en) * 1979-09-12 1982-11-15 Process for producing a watch-glass

Also Published As

Publication number Publication date
DE69733633D1 (de) 2005-08-04
DE69733633T2 (de) 2006-05-18
EP0854403A3 (de) 1999-12-01
EP0854403A2 (de) 1998-07-22
ATE298900T1 (de) 2005-07-15

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