EP0854403A2 - Durchsichtiges und verschleissfestes Uhrenglas und ein mit diesem Glas versehenes Uhrengehäuse - Google Patents

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

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Publication number
EP0854403A2
EP0854403A2 EP97100591A EP97100591A EP0854403A2 EP 0854403 A2 EP0854403 A2 EP 0854403A2 EP 97100591 A EP97100591 A EP 97100591A EP 97100591 A EP97100591 A EP 97100591A EP 0854403 A2 EP0854403 A2 EP 0854403A2
Authority
EP
European Patent Office
Prior art keywords
watch
glass
glasses
same
wear resistant
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
EP97100591A
Other languages
English (en)
French (fr)
Other versions
EP0854403B1 (de
EP0854403A3 (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 AT97100591T priority Critical patent/ATE298900T1/de
Priority to DE69733633T priority patent/DE69733633T2/de
Priority to EP97100591A priority patent/EP0854403B1/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 watch with a low cost price regardless of the complexity of its shape, for example planar or spherical, while having a very high hardness, of the order of 10,000 HV.
  • the present invention also relates to a box of watch fitted with such a glass.
  • Watch glasses for the protection of dials and needles or the like are made most often either synthetic or mineral glass because of their relatively low cost price.
  • the respective hardness of these material categories 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 around 100 and mineral or natural glass has a Vickers hardness of around 900.
  • Now experience showed that the glasses produced in these two categories of materials are poorly resistant to scratches by certain agents very hard such as the silica contained in dust, marble or sand constantly present in our environment, even if the mineral glass resists better against these attacks than synthetic materials. he therefore a relatively rapid alteration of the aesthetic appearance by scratches of these types of glasses or funds of watches.
  • the object of the present invention is therefore precisely a scratch-resistant and transparent watch glass, characterized in that it is made of polycrystalline diamond.
  • the hardness of the glasses watch according to the invention is of the order of 10'000 HV this which makes them almost scratchproof.
  • Diamond glasses polycrystalline of the invention also exhibit the advantage of having excellent resistance to chemical attack.
  • the present invention also relates to a watch case comprising a middle and a back, characterized in that it further comprises a glass which is made of polycrystalline diamond.
  • the watch shown in Figures 1 and 2 includes a box 10, a movement 12 and display means 14, comprising in this case hands and a dial.
  • the box 10 includes a middle part 16, a first and a second closing element of the box, respectively a glass 18 and a bottom 20, as well as a casing circle 22.
  • the middle part 16 is provided with four horns 24 which are extend above the body of the middle and form claws 26 defining with the body of the middle one slide inside which the glass 18 is housed.
  • the base 20 is fixed to the middle part 16 by means of screws not shown in the drawing. He also leans against the casing ring 22. The latter extends over the entire height of the middle part 16 and it bears against the glass 18.
  • the casing ring 22 exerts pressure on the glass 18 which rests on the claws 26.
  • the glass 18 is an element practically scratch-resistant made of polycrystalline diamond.
  • Glass 18 can be obtained in the following manner. We first prepare a graphite substrate comprising an upper surface with the negative shape of the glass that we want to obtain. This negative form is flat in the case of glass 18 but can of course be not planar, for example cylindrical curved, spherical curved or a combination of these forms.
  • the face top of the substrate is polished and then coated with a 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 deposition operation a layer of polycrystalline diamond grows on the surface of the SiC to the desired thickness.
  • the layer of polycrystalline diamond intended to form glass 18 is then polished and, if necessary, dimensioned 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 detached from the substrate, for example by elimination chemical of the 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.
  • the watch case has a upper shell 28 in the form of a spherical cap, of which at least one part is transparent and forms a first watch glass according to the invention.
  • the box also has a lower shell 30, also in the shape of a spherical cap, and a middle part 32 arranged 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. 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 conform respectively to the shape of the faces lower and upper respectively upper 28 and lower 30 shells to serve them bearing surface. So when the box is assembled, the edges 34 and 36 of the upper and lower shells are joined around their entire periphery except for places 38 and 40 provided for the attachment of the strands of bracelet 42 and 44, and the middle no longer appears.
  • the upper shell 28, i.e. the glass, and the lower shell 30, or the bottom, forming the glasses scratch-resistant transparencies are made like glass described in conjunction with Figures 1 and 2. Like the edges shells are joined, the box thus produced is completely scratch-resistant.
  • the spherical cap of the glasses according to the invention normally very expensive when made in artificial sapphire - the case thus obtained has shock absorption characteristics it can undergo high because shocks are transmitted to the seat of shells located on the middle part on which they are fixed, thus benefiting from the arch effect.
  • the two shells may have on the periphery of their inner face a masking layer such as metallization for hide some elements of the box like the middle.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Surface Treatment Of Glass (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Joining Of Glass To Other Materials (AREA)
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
AT97100591T ATE298900T1 (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
EP97100591A EP0854403B1 (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 true EP0854403A2 (de) 1998-07-22
EP0854403A3 EP0854403A3 (de) 1999-12-01
EP0854403B1 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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005047989A3 (en) * 2003-11-12 2005-06-23 Cosetta Schiavolini Horology crystal with three-dimensional decoration

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
CH632891GA3 (en) 1979-09-12 1982-11-15 Process for producing a watch-glass
EP0693573A1 (de) 1994-07-18 1996-01-24 Saint-Gobain/Norton Industrial Ceramics Corporation Erzeugung eines Diamantfilmes

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH966570A4 (de) * 1970-06-25 1974-04-11
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

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
CH632891GA3 (en) 1979-09-12 1982-11-15 Process for producing a watch-glass
EP0693573A1 (de) 1994-07-18 1996-01-24 Saint-Gobain/Norton Industrial Ceramics Corporation Erzeugung eines Diamantfilmes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005047989A3 (en) * 2003-11-12 2005-06-23 Cosetta Schiavolini Horology crystal with three-dimensional decoration

Also Published As

Publication number Publication date
EP0854403B1 (de) 2005-06-29
DE69733633D1 (de) 2005-08-04
DE69733633T2 (de) 2006-05-18
EP0854403A3 (de) 1999-12-01
ATE298900T1 (de) 2005-07-15

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