EP1538492B1 - Enamelled watch face with feet and its fabrication method - Google Patents

Enamelled watch face with feet and its fabrication method Download PDF

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Publication number
EP1538492B1
EP1538492B1 EP03027684A EP03027684A EP1538492B1 EP 1538492 B1 EP1538492 B1 EP 1538492B1 EP 03027684 A EP03027684 A EP 03027684A EP 03027684 A EP03027684 A EP 03027684A EP 1538492 B1 EP1538492 B1 EP 1538492B1
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EP
European Patent Office
Prior art keywords
substrate
feet
dial
enamelled
layer
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
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EP03027684A
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German (de)
French (fr)
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EP1538492A1 (en
Inventor
Steve Bourban
Rudolf Dinger
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Asulab AG
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Asulab AG
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Publication date
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Priority to EP03027684A priority Critical patent/EP1538492B1/en
Priority to CH02059/03A priority patent/CH697052A5/en
Priority to DE60321186T priority patent/DE60321186D1/en
Publication of EP1538492A1 publication Critical patent/EP1538492A1/en
Priority to HK05111120.5A priority patent/HK1079297A1/en
Application granted granted Critical
Publication of EP1538492B1 publication Critical patent/EP1538492B1/en
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Expired - Lifetime legal-status Critical Current

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    • 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
    • G04B19/00—Indicating the time by visual means
    • G04B19/06—Dials
    • G04B19/10—Ornamental shape of the graduations or the surface of the dial; Attachment of the graduations to the dial
    • 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
    • G04B19/00—Indicating the time by visual means
    • G04B19/06—Dials
    • G04B19/12—Selection of materials for dials or graduations markings
    • 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
    • G04B19/00—Indicating the time by visual means
    • G04B19/06—Dials
    • G04B19/14—Fastening the dials to the clock or watch plates
    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D3/00—Watchmakers' or watch-repairers' machines or tools for working materials
    • G04D3/0002—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe
    • G04D3/0043—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe for components of the time-indicating mechanisms
    • G04D3/0048—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe for components of the time-indicating mechanisms for dials

Definitions

  • the present invention relates to an enamelled dial with feet, including an enamelled dial for a timepiece.
  • the invention also relates to a method for manufacturing such a dial, and to fix the feet with a precision requiring no retouch for later positioning in the housings provided in the plate.
  • a template slightly larger than the shape of the wrist is cut out.
  • dial drill holes for copper dial feet, then rivet / weld the feet. It will be observed that no opening, such as the passageways of needles or wickets, is made in the base plate, on the one hand not to weaken it, on the other hand to avoid the formation of wells during enameling.
  • a second step after bending, is deposited an enamel composition on both sides of the plate, by known methods, such as soaking, screen printing or sieving. In the latter case, the underside is previously coated with an adhesive.
  • the dial thus prepared is then passed to the oven at a temperature of between 750 ° C. and 850 ° C., depending on the composition of the enamel. The bending and the lower enamel layer make it possible to control the deformations of the dial, due to the difference between the coefficient of expansion of the copper and that of the enamel, at the end of manufacture.
  • this second step is repeated several times, namely between 2 to 5 times, until the enamel layer has a thickness of about 0.7 mm, the thickness necessary to mask the best possible unattractive appearance of the copper substrate and give the dial the desired mechanical properties.
  • a surface condition check is performed to remove unwanted inclusions and to fill the pores, and the dial is again subjected to heat treatment.
  • the third step involves tracing the dial indexes, applying a film of enamel or very fine enamel with a passage in the oven, and then pressing at a certain temperature to give the dial the optimum flatness.
  • the fourth step is to retouch on the back of the dial.
  • the "technical" enamel layer is roughly leveled, but retains a granular and porous appearance.
  • the feet which may have undergone distortions during previous handling and thermal treatments, are first removed by filing the enamel film which can cover them and then straightened so that they coincide perfectly with the housings provided in the plate. .
  • the risks of damaging an almost finished product are great. Indeed, the straightening of the feet can cause either their breakage, or cracks in the enamel layer, or even its partial detachment.
  • the present invention therefore aims to overcome the drawbacks of this prior art, by providing a method of manufacturing an enamelled dial with feet having a smaller number of steps and not requiring the repositioning of the feet at the end of manufacture, nor a grinding for the setting of the dial.
  • the subject of the invention is an enamelled dial with positioning feet in the plate of a watch movement, said dial being formed from a ceramic substrate whose outer surface is coated with one to two layers enamel and whose inner surface, on the movement side, comprises a gripping film allowing the deposition of a thicker metal layer for fixing with precision the head of the feet by gluing, This deposit can be performed, for example by galvanic growth.
  • the ceramic substrate has a light hue, the small number of enamel layers is sufficient to have, with a thickness of between 0.1 mm and 0.4 mm, a very satisfactory surface state and allows conversely have a thicker substrate.
  • the thickness of the ceramic substrate is preferably between 0.4 mm, which is a value already allowing to have satisfactory mechanical properties, and 0.9 mm.
  • the finished dial is therefore substantially the same thickness as the dials of the prior art, but with an inversion of the substrate / enamel layer thickness ratios.
  • a housing for the head said housing being designed during pressing, or subsequently produced by machining.
  • the Figure 1A represents the first step of the process consisting in coating a ceramic substrate 1 having a thickness of between 0.4 mm and 0.9 mm, preferably 0.7 mm, of one or two enamel layers having a total of thickness between 0.1 and 0.4 mm, that is to say having a substrate whose thickness is at least twice greater than that of the enamel layer. This small number of enamel layers is quite sufficient, given the clear appearance of the ceramic substrate.
  • Substrate 1 is obtained by pressing or by the well-known CIM (Ceramic Injection Molting) process, from a ceramic powder such as aluminum oxide or zirconium oxide.
  • CIM Chemical Injection Molting
  • the control of this process is currently sufficient to produce parts with a very tight tolerance requiring no further editing, especially as the very small number of enamel layers does not produce edge effects.
  • edge effects although not represented on the Figure 1A it is also possible to start from a substrate 1 having needle axis passages and possibly wickets, or to form them by machining before enameling.
  • the ceramic plate forming the substrate 1 is indeed sufficiently rigid not to be weakened by through passages.
  • the decal is also performed hourly indexes or other signs, then the frosting (not shown).
  • the second step relates to the treatment of the underside of the dial for fixing the dial foot by gluing, brazing.
  • the attachment layer 5, of the order of a few tens of nanometers, is made for example of titanium, nickel, chromium, tungsten or vanadium. Given the small thickness of the ceramic substrate 1 and the enamel layer 3, the attachment layer 5 can also act as a reflector and make the dial even brighter. As regards the deposition of the thick layer 7, whose thickness is of the order of 0.01 mm, it is made of nickel, copper or copper alloys, or gold or gold alloys, especially for high-end timepieces.
  • the third step consists in coming to fix on the thick layer 7, the head 11 of the foot 9, by gluing, welding or brazing, in the precise position that it must occupy for mounting the dial on the plate, that is to say without having to exert mechanical constraints on it to reposition it.
  • the foot 9 and its head 11 is made from a copper rod, or even gold alloy if the thick layer 7 junction is also gold.
  • a dial according to the invention obtained according to a second embodiment. It differs from the first embodiment which has just been described in that the positioning of the foot 9 is obtained even more precisely thanks to a cylindrical housing 13 provided during the manufacture of the ceramic substrate 1 or by subsequent machining.
  • the other treatments of the underside of the dial and the attachment means of the foot are also identical.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Glass Compositions (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Insulated Metal Substrates For Printed Circuits (AREA)

Description

La présente invention a pour objet un cadran émaillé avec pieds, notamment un cadran émaillé pour pièce d'horlogerie. L'invention concerne également un procédé permettant de fabriquer un tel cadran, et de fixer les pieds avec une précision ne demandant aucune retouche pour le positionnement ultérieur dans des logements prévus dans la platine.The present invention relates to an enamelled dial with feet, including an enamelled dial for a timepiece. The invention also relates to a method for manufacturing such a dial, and to fix the feet with a precision requiring no retouch for later positioning in the housings provided in the plate.

Pour les pièces d'horlogerie anciennes, montres ou pendules, l'émaillage de la face visible du cadran était utile, notamment pour masquer un substrat généralement réalisé en cuivre, ou alliage de cuivre dans un but esthétique. De plus, dans les pièces de petites dimensions, telles que les montres-bracelets, il est nécessaire que la face arrière du cadran soit pourvue de pieds pour assurer un positionnement correct dudit cadran. Il est également nécessaire que ladite face arrière du cadran comporte un contre-émaillage, même grossier, pour compenser les tensions résultant de l'émaillage de la face visible. Ainsi, pour obtenir un cadran émail de qualité, encore utilisé dans les montres haut de gamme, le procédé traditionnel de fabrication comporte un très grand nombre d'étapes exigeant de la part du fabricant un grand savoir-faire qui n'empêche pas malgré cela d'avoir un pourcentage de rebut important, comme on va le comprendre ci-après.For antique timepieces, watches or clocks, enamelling of the visible face of the dial was useful, especially to hide a substrate generally made of copper, or copper alloy for aesthetic purposes. In addition, in small parts, such as wristwatches, it is necessary that the rear face of the dial is provided with feet to ensure proper positioning of said dial. It is also necessary that said rear face of the dial includes a coarse enameling, even coarse, to compensate for the tensions resulting from the enameling of the visible face. Thus, to obtain a quality enamel dial, still used in high-end watches, the traditional manufacturing process involves a very large number of steps requiring from the manufacturer a great know-how that does not prevent despite this to have a significant percentage of waste, as will be understood below.

Dans une première étape, on découpe dans une mince plaque de cuivre, ou alliages de cuivre (0,1 mm pour une montre bracelet, jusqu'à 0,4 mm pour une pendule), un gabarit un peu plus grand que la forme du cadran, on perce des trous pour les pieds de cadran en cuivre, puis on effectue le rivetage/soudage des pieds. On observera qu'aucune ouverture, telle que les passages d'aiguilles ou des guichets, n'est effectuée dans la plaque de base, d'une part pour ne pas l'affaiblir, d'autre part pour éviter la formation de puits lors de l'émaillage.In a first step, in a thin copper plate, or copper alloys (0.1 mm for a wristwatch, up to 0.4 mm for a pendulum), a template slightly larger than the shape of the wrist is cut out. dial, drill holes for copper dial feet, then rivet / weld the feet. It will be observed that no opening, such as the passageways of needles or wickets, is made in the base plate, on the one hand not to weaken it, on the other hand to avoid the formation of wells during enameling.

Dans une deuxième étape, après avoir effectué un bombage, on dépose une composition d'émail sur les deux faces de la plaque, par des procédés connus, tels que le trempage, la sérigraphie ou le saupoudrage au tamis. Dans ce dernier cas, la face inférieure est préalablement revêtue d'une colle. Le cadran ainsi préparé est ensuite passé au four à une température comprise entre 750° C et 850° C selon la composition de l'émail. Le bombage et la couche d'émail inférieure permettent de maîtriser les déformations du cadran, dues à la différence entre le coefficient de dilatation du cuivre et celui de l'émail, en fin de fabrication.In a second step, after bending, is deposited an enamel composition on both sides of the plate, by known methods, such as soaking, screen printing or sieving. In the latter case, the underside is previously coated with an adhesive. The dial thus prepared is then passed to the oven at a temperature of between 750 ° C. and 850 ° C., depending on the composition of the enamel. The bending and the lower enamel layer make it possible to control the deformations of the dial, due to the difference between the coefficient of expansion of the copper and that of the enamel, at the end of manufacture.

Pour la face visible du cadran, cette deuxième étape est renouvelée plusieurs fois, à savoir entre 2 à 5 fois, jusqu'à ce que la couche d'émail ait une épaisseur d'environ 0,7 mm, épaisseur nécessaire pour masquer le mieux possible l'aspect peu esthétique du substrat en cuivre et conférer au cadran les propriétés mécaniques désirées. A la fin de ce cycle, un contrôle d'état de surface est effectué pour éliminer les inclusions indésirables et pour remplir les pores, et le cadran est à nouveau soumis à un traitement thermique.For the visible face of the dial, this second step is repeated several times, namely between 2 to 5 times, until the enamel layer has a thickness of about 0.7 mm, the thickness necessary to mask the best possible unattractive appearance of the copper substrate and give the dial the desired mechanical properties. At the end of this cycle, a surface condition check is performed to remove unwanted inclusions and to fill the pores, and the dial is again subjected to heat treatment.

La troisième étape consiste à décalquer les index de cadran, à appliquer un film de vernis ou d'émail très fin avec un passage au four, puis à effectuer un pressage à une température déterminée pour conférer au cadran la planéité optimum.The third step involves tracing the dial indexes, applying a film of enamel or very fine enamel with a passage in the oven, and then pressing at a certain temperature to give the dial the optimum flatness.

La quatrième étape consiste à faire des retouches sur la face arrière du cadran. La couche d'émail "technique" est grossièrement mise à niveau, mais conserve un aspect granuleux et poreux. Les pieds, qui ont pu subir des distorsions lors des manipulations et des traitements thermiques précédents, sont d'abord débarrassés par limage du film d'émail qui peut les recouvrir, puis redressés pour qu'ils coïncident parfaitement avec les logements prévus dans la platine. Au cours de cette étape, les risques d'endommager un produit presque fini sont grands. En effet, le redressement des pieds peut provoquer soit leur rupture, soit des craquelures dans la couche d'émail, voire son décollement partiel.The fourth step is to retouch on the back of the dial. The "technical" enamel layer is roughly leveled, but retains a granular and porous appearance. The feet, which may have undergone distortions during previous handling and thermal treatments, are first removed by filing the enamel film which can cover them and then straightened so that they coincide perfectly with the housings provided in the plate. . During this step, the risks of damaging an almost finished product are great. Indeed, the straightening of the feet can cause either their breakage, or cracks in the enamel layer, or even its partial detachment.

Dans une dernière étape, on effectue le perçage d'un trou au centre et, si nécessaire, la découpe d'un guichet, puis on effectue par meulage, la mise aux cotes du cadran, étant donné que les couches d'émail présentent une inclinaison sur le pourtour. On connaît également des cadrans avec pieds dont le substrat n'est pas nécessairement métallique. Le brevet GB 2 052 113 décrit par exemple un cadran dont le substrat peut également être en pierre précieuse, en plastique ou en céramique. Dans ce document les pieds sont fixés par soudage en ayant préalablement déposé sur la face intérieure du cadran un film d'accrochage et une couche métallique, la face supérieure du cadran ne comportant aucun revêtement.In a final step, the drilling of a hole in the center and, if necessary, the cutting of a window, then carried out by grinding, the setting of the scale of the dial, since the enamel layers have a tilt on the periphery. There are also known dials with feet whose substrate is not necessarily metallic. The patent GB 2,052,113 describes for example a dial whose substrate can also be precious stone, plastic or ceramic. In this document the feet are fixed by welding having previously deposited on the inner face of the dial a bonding film and a metal layer, the upper face of the dial having no coating.

La présente invention vise donc à pallier les inconvénients de cet art antérieur, en procurant un procédé de fabrication d'un cadran émaillé avec pieds comportant un moins grand nombre d'étapes et ne nécessitant pas le repositionnement des pieds en fin de fabrication, ni un meulage pour la mise aux cotes du cadran.The present invention therefore aims to overcome the drawbacks of this prior art, by providing a method of manufacturing an enamelled dial with feet having a smaller number of steps and not requiring the repositioning of the feet at the end of manufacture, nor a grinding for the setting of the dial.

A cet effet, l'invention a pour objet un cadran émaillé avec des pieds de positionnement dans la platine d'un mouvement horloger, ledit cadran étant formé à partir d'un substrat céramique dont la surface externe est revêtue d'une à deux couches d'émail et dont la surface interne, côté mouvement, comporte un film d'accrochage permettant le dépôt d'une couche métallique plus épaisse permettant de fixer avec grande précision la tête des pieds par collage, Ce dépôt peut être effectué, par exemple par croissance galvanique. La mise en place des pieds intervenant au tout dernier stade de fabrication, ceux-ci n'ont pas subi les contraintes thermiques, ni les manipulations dues à l'émaillage, ce qui évite leur repositionnement ultérieur lors du montage sur le mouvement.For this purpose, the subject of the invention is an enamelled dial with positioning feet in the plate of a watch movement, said dial being formed from a ceramic substrate whose outer surface is coated with one to two layers enamel and whose inner surface, on the movement side, comprises a gripping film allowing the deposition of a thicker metal layer for fixing with precision the head of the feet by gluing, This deposit can be performed, for example by galvanic growth. The installation of the feet intervening at the very last stage of manufacture, they did not undergo the thermal stresses, nor the manipulations due to the enamelling, which avoids their repositioning later during the assembly on the movement.

Etant donné que le substrat céramique a une teinte claire, le petit nombre de couches d'émail est suffisant pour avoir, avec une épaisseur comprise entre 0,1 mm et 0,4 mm, un état de surface très satisfaisant et permet inversement d'avoir un substrat plus épais. L'épaisseur du substrat céramique est de préférence comprise entre 0,4 mm, qui est une valeur permettant déjà d'avoir des propriétés mécaniques satisfaisantes, et 0,9 mm. Le cadran terminé a donc sensiblement la même épaisseur que les cadrans de art antérieur, mais avec une inversion des rapports d'épaisseur substrat/couche d'émail.Since the ceramic substrate has a light hue, the small number of enamel layers is sufficient to have, with a thickness of between 0.1 mm and 0.4 mm, a very satisfactory surface state and allows conversely have a thicker substrate. The thickness of the ceramic substrate is preferably between 0.4 mm, which is a value already allowing to have satisfactory mechanical properties, and 0.9 mm. The finished dial is therefore substantially the same thickness as the dials of the prior art, but with an inversion of the substrate / enamel layer thickness ratios.

Pour assurer un positionnement encore plus précis de pieds, il est également possible de prévoir dans le substrat céramique un logement pour la tête, ledit logement étant conçu lors du pressage, ou réalisé ultérieurement par usinage.To ensure even more precise positioning of feet, it is also possible to provide in the ceramic substrate a housing for the head, said housing being designed during pressing, or subsequently produced by machining.

D'autres caractéristiques et avantages de la présente invention apparaîtront dans la description suivante donnée à titre illustratif et non limitatif, en référence aux dessins annexés dans lesquels :

  • les figures 1A, 1B et 1C représentent en coupe, près d'un bord d'un cadran émaillé avec pieds selon l'invention, les étapes de fabrication selon un premier mode de réalisation; et
  • la figure 2 représente en coupe près d'un bord une partie de cadran selon l'invention obtenu selon un deuxième mode de réalisation.
Other features and advantages of the present invention will appear in the following description given by way of illustration and without limitation, with reference to the appended drawings in which:
  • the FIGS. 1A, 1B and 1C represent in section, near an edge of an enamelled dial with feet according to the invention, the manufacturing steps according to a first embodiment; and
  • the figure 2 represents in section near an edge a portion of the dial according to the invention obtained according to a second embodiment.

On observera tout d'abord que, pour plus de clarté dans les dessins, toutes les épaisseurs n'ont pas été représentées à la même échelle.It will be observed first of all that, for the sake of clarity in the drawings, not all the thicknesses have been represented on the same scale.

La figure 1A représente la première étape du procédé qui consiste à revêtir un substrat 1 en céramique ayant une épaisseur comprise entre 0,4 mm et 0,9 mm, de préférence 0,7 mm, d'une ou deux couches d'émail ayant en tout une épaisseur comprise entre 0,1 et 0,4 mm, c'est-à-dire en ayant un substrat dont l'épaisseur est au moins deux fois supérieure à celle de la couche d'émail. Ce petit nombre de couches d'émail est tout à fait suffisant, compte tenu de l'aspect clair du substrat en céramique.The Figure 1A represents the first step of the process consisting in coating a ceramic substrate 1 having a thickness of between 0.4 mm and 0.9 mm, preferably 0.7 mm, of one or two enamel layers having a total of thickness between 0.1 and 0.4 mm, that is to say having a substrate whose thickness is at least twice greater than that of the enamel layer. This small number of enamel layers is quite sufficient, given the clear appearance of the ceramic substrate.

Le substrat 1 est obtenu par pressage ou par le procédé CIM (Ceramic Injection Molting) bien connu, à partir d'une poudre de céramique telle qu'oxyde d'aluminium ou de zirconium. La maîtrise de ce procédé est actuellement suffisante pour produire des pièces avec une tolérance très serrée ne nécessitant aucune retouche ultérieure, d'autant que le très petit nombre de couches d'émail ne produit pas d'effet de bord. Compte tenu de cette absence d'effet de bord, bien que non représenté sur la figure 1A, il est également possible de partir d'un substrat 1 comportant des passages d'axes d'aiguilles et éventuellement des guichets, ou de les former par usinage avant émaillage. La plaquette de céramique formant le substrat 1 est en effet suffisamment rigide pour ne pas être affaiblie par des passages traversants. Dans cette étape, on effectue également le décalque des index horaires ou autres signes, puis le glaçage (non représenté).Substrate 1 is obtained by pressing or by the well-known CIM (Ceramic Injection Molting) process, from a ceramic powder such as aluminum oxide or zirconium oxide. The control of this process is currently sufficient to produce parts with a very tight tolerance requiring no further editing, especially as the very small number of enamel layers does not produce edge effects. Given this lack of edge effects, although not represented on the Figure 1A it is also possible to start from a substrate 1 having needle axis passages and possibly wickets, or to form them by machining before enameling. The ceramic plate forming the substrate 1 is indeed sufficiently rigid not to be weakened by through passages. In this step, the decal is also performed hourly indexes or other signs, then the frosting (not shown).

La deuxième étape, représentée à la figure 1B, concerne le traitement de la face inférieure du cadran permettant la fixation du pied de cadran par collage, brasage. On effectue d'abord, par évaporation sur la surface céramique, le dépôt d'un film d'accrochage 5, puis par croissance galvanique, ou autres techniques équivalentes, le dépôt d'une couche plus épaisse 7 permettant de fixer le pied.The second step, represented at Figure 1B , relates to the treatment of the underside of the dial for fixing the dial foot by gluing, brazing. First, by evaporation on the ceramic surface, the deposition of a bonding film 5, then by galvanic growth, or other equivalent techniques, the deposition of a thicker layer 7 for fixing the foot.

La couche d'accrochage 5, de l'ordre de quelques dizaines de nanomètres, est réalisée par exemple en titane, nickel, chrome, tungstène ou vanadium. Compte tenu de la faible épaisseur du substrat céramique 1 et de la couche d'émail 3, la couche d'accrochage 5 peut en outre faire fonction de réflecteur et rendre le cadran encore plus lumineux. En ce qui concerne le dépôt de la couche épaisse 7, dont l'épaisseur est de l'ordre de 0,01 mm, il est réalisé en nickel, en cuivre ou alliages de cuivre, ou en or ou alliages d'or notamment pour les pièces d'horlogerie haut de gamme.The attachment layer 5, of the order of a few tens of nanometers, is made for example of titanium, nickel, chromium, tungsten or vanadium. Given the small thickness of the ceramic substrate 1 and the enamel layer 3, the attachment layer 5 can also act as a reflector and make the dial even brighter. As regards the deposition of the thick layer 7, whose thickness is of the order of 0.01 mm, it is made of nickel, copper or copper alloys, or gold or gold alloys, especially for high-end timepieces.

La troisième étape, représentée à la figure 1C, consiste à venir fixer sur la couche épaisse 7, la tête 11 du pied 9, par collage, soudage ou brasage, dans la position précise qu'il doit occuper pour le montage du cadran sur la platine, c'est-à-dire sans devoir exercer des contraintes mécaniques sur celui-ci pour la repositionner. Le pied 9 et sa tête 11 est réalisé à partir d'une tige en cuivre, voire en alliage d'or si la couche épaisse 7 de jonction est également en or.The third step, represented at figure 1C , consists in coming to fix on the thick layer 7, the head 11 of the foot 9, by gluing, welding or brazing, in the precise position that it must occupy for mounting the dial on the plate, that is to say without having to exert mechanical constraints on it to reposition it. The foot 9 and its head 11 is made from a copper rod, or even gold alloy if the thick layer 7 junction is also gold.

En se référant maintenant à la figure 2, on a représenté un cadran selon l'invention obtenu selon un deuxième mode de réalisation. Il diffère du premier mode de réalisation qui vient d'être décrit en ce que le positionnement du pied 9 est obtenu de façon encore plus précise grâce à un logement cylindrique 13 prévu lors de la fabrication du substrat céramique 1 ou par usinage ultérieur. Les autres traitements de la face inférieure du cadran et les moyens de fixation du pied sont par ailleurs identiques.Referring now to the figure 2 , there is shown a dial according to the invention obtained according to a second embodiment. It differs from the first embodiment which has just been described in that the positioning of the foot 9 is obtained even more precisely thanks to a cylindrical housing 13 provided during the manufacture of the ceramic substrate 1 or by subsequent machining. The other treatments of the underside of the dial and the attachment means of the foot are also identical.

Claims (9)

  1. Enamelled dial with location feet (9) including a substrate (1) made of ceramic, the internal surface of said substrate (1) having a hanging film (5) on which a thicker layer (7) is deposited, characterized in that the external surface of said substrate is coated with one or two enamel layers (3), and in that the head (11) of the feet (9) is fastened by bonding to said metallic layer.
  2. Enamelled dial according to claim 1, characterized in that the internal surface of the substrate (1) further includes a cylindrical housing (13) permitting a precise location of the feet (9).
  3. Enamelled dial according to claim 1, characterized in that the ceramic substrate (1) is at least twice thicker than the enamel layer (3).
  4. Enamelled dial according to claim 1, characterized in that the ceramic substrate (1) further includes before enamelling some axis cuttings for needle and if necessary some apertures.
  5. Enamelled dial according to claim 1, characterized in that the hanging film (5) is chosen among titanium, vanadium, tungsten and chromium.
  6. Enamelled dial according to claim 1, characterized in that the thick layer (7) is chosen among nickel, copper or copper alloy, chromium and gold or gold alloy.
  7. Manufacturing method of an enamelled dial with feet, characterized in that it includes the following steps:
    - forming a substrate (1a) made of ceramic with accurate dimensions of the final dial;
    - coating on the external face of the substrate (1) one to two enamel layers;
    - coating on the internal face of the dial a hanging film (5);
    - carrying out a thick metallic deposition (7) on the hanging layer (7), and
    - fastening the feet (9) to the suitable places by bonding.
  8. Method of an enamelled dial according to claim 7, characterized in that the internal surface of the substrate (1) further includes a cylindrical housing (13) permitting a precise location of the feet (9).
  9. Method of an enamelled dial according to claim 7, characterized in that the substrate further includes some axis cuttings for needle and if necessary some apertures.
EP03027684A 2003-12-03 2003-12-03 Enamelled watch face with feet and its fabrication method Expired - Lifetime EP1538492B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP03027684A EP1538492B1 (en) 2003-12-03 2003-12-03 Enamelled watch face with feet and its fabrication method
CH02059/03A CH697052A5 (en) 2003-12-03 2003-12-03 Enameled dial for e.g. luxury watch, has substrate including inner surface with hooking film and thick metallic layer for fixing head of positioning feet by sticking, soldering/brazing, where inner surface has housing for each foot
DE60321186T DE60321186D1 (en) 2003-12-03 2003-12-03 Enamelled dial with feet and its manufacturing process
HK05111120.5A HK1079297A1 (en) 2003-12-03 2005-12-06 Enamelled watch face with feet and its fabrication method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03027684A EP1538492B1 (en) 2003-12-03 2003-12-03 Enamelled watch face with feet and its fabrication method

Publications (2)

Publication Number Publication Date
EP1538492A1 EP1538492A1 (en) 2005-06-08
EP1538492B1 true EP1538492B1 (en) 2008-05-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP03027684A Expired - Lifetime EP1538492B1 (en) 2003-12-03 2003-12-03 Enamelled watch face with feet and its fabrication method

Country Status (4)

Country Link
EP (1) EP1538492B1 (en)
CH (1) CH697052A5 (en)
DE (1) DE60321186D1 (en)
HK (1) HK1079297A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103576530A (en) * 2012-07-19 2014-02-12 王辉 Ceramic watch
CN107329390B (en) * 2017-07-27 2023-06-16 广州番禺职业技术学院 High-temperature enamel dial and manufacturing method thereof
EP3835880B1 (en) * 2019-12-10 2022-08-10 Comadur S.A. Horological dial with feet

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4881565A (en) * 1972-02-01 1973-10-31
JPS569074U (en) * 1979-06-29 1981-01-26
JPS61202184A (en) * 1985-03-05 1986-09-06 Citizen Watch Co Ltd Dial late of timepiece
GB2207092A (en) * 1987-06-24 1989-01-25 Totceramica Maquinaria Machine for printing ceramic pieces

Also Published As

Publication number Publication date
CH697052A5 (en) 2008-03-31
EP1538492A1 (en) 2005-06-08
HK1079297A1 (en) 2006-03-31
DE60321186D1 (en) 2008-07-03

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