FORMATION OF A THREE-DIMENSIONAL OBJECT ON A DIAL

Abstract

A deposition method for forming a three-dimensional object on a watch dial and/or a watch bezel that includes at least supplying at least one support and depositing an adhesion layer, an outline of the object is delimited in order to enable a cavity to be formed by the deposition of a plurality of polymer layers, such that said object is formed by filling said cavity by the deposition of at least one finish layer.

Claims

1-13. (canceled)

14. A deposition method for the formation of an object for a watch; the object including a perimeter, at least one first surface and/or a volume; the deposition method comprising at least one step of: supplying at least one support comprising at least one receiving surface; depositing an adhesion layer on the at least one receiving surface, said adhesion layer being formed of one or more layers made of at least one material selected from among Au, Cu, Ag, In, Pt, Pd, Ni, Ti, Ta, Cr, Th or an alloy of these materials, so as to render said at least one receiving surface electrically conducting; delimiting an outline on the deposited adhesion layer; the outline corresponding to the perimeter, to the at least one first surface and/or to the volume of the object; forming a cavity along the outline by depositing, on the adhesion layer, a plurality of polymer layers, such that a portion of the adhesion layer equivalent to the perimeter, to the at least one first surface and/or to the volume of the object is opposite, preferably free, and is not covered by polymer layers; filling the cavity by depositing on the opposite, preferably free, portion of the adhesion layer at least one finishing layer comprising at least one material selected from Au, Cu, Ag, In, Pt, Pd, Ni, Ti, Ta, Cr, Th or an alloy of these materials; and, carrying out a surface treatment on the plurality of polymer layers and the deposited adhesion layer so as to expose the at least one receiving surface of the support wherein the deposition of the plurality of polymer layers is made by additive manufacturing.

15. The deposition method according to claim 14, wherein said object comprises at least one second surface that is more curved than said at least one first surface.

16. The deposition method according to claim 14, wherein said cavity is formed along a median of said object and/or said outline is formed along a median of said object.

17. The deposition method according to claim 15, wherein said cavity is formed along a median of said object and/or said outline is formed along a median of said object.

18. The deposition method according to claim 16, wherein said median forms an angle with said at least one receiving surface.

19. The deposition method according to claim 17, wherein said median forms an angle with said at least one receiving surface.

20. The deposition method according to claim 14, wherein said object forms an undercut in said plurality of polymer layers or said object comprises an undercut.

21. The deposition method according to claim 14, wherein said at least one finish layer comprises at least one material selected from among Au, Pt, Ag, Cr, Pd or an alloy of these materials.

22. The deposition method according to claim 14, wherein said surface treatment is carried out by pickling and/or stripping.

23. The deposition method according to claim 14, wherein said support is made of ceramic.

24. The deposition method according to claim 14, wherein said deposition of said adhesion layer is carried out in contact with said at least one receiving surface.

25. A watch comprising at least one support and an object produced according to claim 14 of said deposition method.

26. The watch according to claim 23, wherein said at least one support is a dial or a bezel.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0031] The invention will be described in more detail hereafter using the accompanying drawings, given by way of examples that are in no way limiting, wherein:

[0032] FIG. 1 shows a deposition method 500 according to the invention;

[0033] FIGS. 2 and 3 illustrate examples of objects having an undercut 224 and/or a curved surface, and,

[0034] FIG. 4 shows an example of a watch dial produced according to said deposition method 500.

DETAILED DESCRIPTION OF THE INVENTION

[0035] FIGS. 2 and 3 show different objects that are referred to as complex because of their geometries. More specifically, these objects have at least one curved surface and have an undercut 224, which makes it difficult to replicate these shapes on an industrial scale.

[0036] More specifically, most current methods use a directional beam of light to create patterns with a rectangular cross-section.

[0037] However, curved surfaces procure an appearance that is very popular with users. To this end, the applicant proposes a deposition method 500, visible in FIG. 1, for forming an object 220 on at least one support 210, preferably made of ceramic, which can take the form of a watch dial 210 or a watch bezel 210.

[0038] Said object 220 can include a perimeter, at least one first surface 221, at least one second surface 222 that is more curved than said at least one first surface 221 as shown in FIGS. 2 and 3, and/or a volume.

[0039] In a first step, said at least one support 210 comprising at least one receiving surface 211 is supplied 510. This is followed by the deposition 520 of an adhesion layer 120, which can be formed of one or more layers using a dry process such as PVD, CVD or PE CVD or ALD, made of at least one material selected from among Au, Cu, Ag, In, Pt Pd Ni, Ti, Ta, Cr, Th or an alloy of these materials, on said at least one receiving surface 211, preferably in contact with said at least one receiving surface 211 so as to render said at least one receiving surface 211 electrically conducting.

[0040] A delimitation 530 is carried out to determine an outline 229 of said object 220 on said deposited adhesion layer 120. Said outline 229 corresponds to said perimeter, to said at least one first surface 221, to said at least one second surface 222 and/or to said volume of said object 220. As can be seen in all of the objects 220 shown in FIGS. 1 to 4, an undercut 224 is present. Said undercut 224, which can be positive or negative, cannot be produced with the current methods because the light source is directive and does not allow objects with an undercut to be produced, more particularly on watch dials for example.

[0041] Said delimitation 530 of said outline 229 is essential for the formation 540 of a cavity 225 along said outline 229 and, preferably, along a median 223 of said object 220. Although the objects 220 have a median perpendicular to said at least one receiving surface 211, in embodiments, said median 223 can be at an angle to said at least one receiving surface 211.

[0042] Said cavity 225 is formed 540 by depositing a plurality of polymer layers 130 by additive manufacturing on said adhesion layer 120 such that a portion of said adhesion layer 120 equivalent to said perimeter, to said at least one first surface 221 and/or to said volume of said object 220 is opposite, preferably free. In other words, said portion of said adhesion layer 120 is not covered with polymer layers 130.

[0043] Said cavity 225, on said opposite, preferably free portion of said adhesion layer 120, is filled by the deposition 520 of at least one finish layer 140 comprising at least one material selected from or an alloy of these materials. These materials are selected because they allow complex shapes to be produced by additive manufacturing.

[0044] In order to procure an optimal appearance, a surface treatment 560 can be carried out by pickling and/or stripping for example, on said plurality of polymer layers 130 and on said adhesion layer 120 deposited so as to expose said at least one receiving surface 211 of said support 210 and to give a better visual appearance to said at least one receiving surface 211 of said support 210. In cases where the top surface is said at least one second surface 222, the latter, i.e. said at least one second surface 222 will be covered with polymer layers 130, and said surface treatment 560 will remove said plurality of polymer layers 130 present on said top surface without damaging the visual appearance of said at least one second surface 222.

[0045] Thus, thanks to this invention, objects with complex shapes such as rounded outlines or curved surfaces and thus watch dials 210 and/or watch bezels 210 with a novel and highly appreciable visual appearance can be created.