The present invention relates to a timepiece component comprising on at least one part of its surface a coating formed of one or more layers of organic pigments.

This invention teaches a new class of materials that can be used to manufacture hairsprings and/or other components of mechanical watches, and methods for manufacturing these components. The new class of materials is crystalline compounds, including, but not limited to, gallium arsenide, extrinsically doped gallium arsenide, extrinsically doped silicon, gallium nitride, extrinsically doped gallium nitride, gallium phosphide, extrinsically doped gallium phosphide, and quartz. This invention also teaches laminated/coated crystalline compounds. The lamination/coating may be applied by one of the following methods, including but not limited to: plasma enhanced chemical vapor deposition, atomic layer deposition, sputtering, electron beam evaporation, and thermal evaporation. Using crystalline compounds, in particular extrinsically doping the crystalline compounds, affords the possibility to controllably alter the mechanical, electrical, thermal, magnetic, and/or other properties of the watch components. These properties can be further altered by applying single or multiple laminates/coatings of varying thicknesses and/or geometries.

A cover (100) for a wrist-worn electronic device, which cover (100) includes an exterior layer (101) which forms an exterior of the cover (100), and an interior layer (114) which forms an interior of the cover (100). The interior layer (114) abuts against an exterior of the electronic device when the cover (100) is arranged on the wrist-worn electronic device. The interior layer (114) is attached to the exterior layer (101), and includes a raised bezel (112) which extends further from a face of the wrist-worn electronic device than the exterior layer (101) so as to form at least a part of an exterior surface of the cover (100).

An amorphously solidifying noble metal alloy has the following composition of AaBbCc, wherein: A represents at least one noble metal from a group of platinum and palladium; B represents at least one element from a group of Al, Au, Ag and Cu; and C represents at least one element from a group of Ga and Ge. The mass fraction a lies in a region of 45-60 mass percent. The mass fraction b lies in the region of 39-55 mass percent. The mass fraction c lies in the region of 0-13 mass percent. Where platinum and palladium are both present, the amorphous noble metal alloy does not have aluminum as the sole alloy component from group B. The above mass fractions a, b and c, aside from typical admixtures, impurities and alloy tolerances, add up to 100 mass percent.

An amorphously solidifying noble metal alloy has the following composition of AaBbCc, wherein: A represents at least one noble metal from a group of platinum and palladium; B represents at least one element from a group of Al, Au, Ag and Cu; and C represents at least one element from a group of Ga and Ge. The mass fraction a lies in a region of 45-60 mass percent. The mass fraction b lies in the region of 39-55 mass percent. The mass fraction c lies in the region of 0-13 mass percent. Where platinum and palladium are both present, the amorphous noble metal alloy does not have aluminum as the sole alloy component from group B. The above mass fractions a, b and c, aside from typical admixtures, impurities and alloy tolerances, add up to 100 mass percent.

A case includes a main case body and an exterior member. The exterior member is welded to the main case body with laser light. The laser light is irradiated onto an irradiation surface. A welding part of the main case body and the exterior member is formed on the inner periphery surface extending along a height direction of the case and is formed such that the irradiation surface is perpendicular to the incident laser light.

A method of manufacturing an external part of a timepiece, including: providing a metallic base made of a first material including titanium and/or a first titanium alloy; providing at least one metallic cover plate made of a second material, the second material including a second metal chosen from among gold or platinum, and/or a second alloy including at least gold or platinum, the at least one cover plate being of a thickness greater than or equal to 0.5 millimeters; brazing the cover plate onto the base with a braze material chosen for brazing titanium with gold or respectively platinum to form a bimetallic blank; and shaping the bimetallic blank to give the external part its final form.

A method of manufacturing an external part of a timepiece, including: providing a metallic base made of a first material including titanium and/or a first titanium alloy; providing at least one metallic cover plate made of a second material, the second material including a second metal chosen from among gold or platinum, and/or a second alloy including at least gold or platinum, the at least one cover plate being of a thickness greater than or equal to 0.5 millimeters; brazing the cover plate onto the base with a braze material chosen for brazing titanium with gold or respectively platinum to form a bimetallic blank; and shaping the bimetallic blank to give the external part its final form.

Light, precious gold-titanium based alloy containing, by mass, at least 750% of gold, characterized in that said alloy has the following composition formula:

Ti.sub.aAu.sub.bM.sub.cT.sub.d

where a, b, c, d are atomic proportions such that:

a+b+c+d=1,

0.45≦a≦0.55; 0.41≦b≦0.495; 0.025≦c≦0.13; 0.001≦d≦0.025,

where M represents one or more elements taken from among a first group including Nb, V, Pd, Pt, Fe,
and where T represents a maximum of two elements taken from among a second group including Nb, V, Pd, Pt, Fe, Mo, Ta, W, Co, Ni, Ru, Rh, Ir, Cr, Mn, Cu, Zn, Ag, Al, B, Si, Ge, Sn, Sb, In, with the exception of said metals M comprised in said alloy.

Component for timepiece or for jewellery made from such a light, precious gold-titanium based alloy.

Light, precious gold-titanium based alloy containing, by mass, at least 750% of gold, characterized in that said alloy has the following composition formula:

Ti.sub.aAu.sub.bM.sub.cT.sub.d

where a, b, c, d are atomic proportions such that:

a+b+c+d=1,

0.45≦a≦0.55; 0.41≦b≦0.495; 0.025≦c≦0.13; 0.001≦d≦0.025,

where M represents one or more elements taken from among a first group including Nb, V, Pd, Pt, Fe,
and where T represents a maximum of two elements taken from among a second group including Nb, V, Pd, Pt, Fe, Mo, Ta, W, Co, Ni, Ru, Rh, Ir, Cr, Mn, Cu, Zn, Ag, Al, B, Si, Ge, Sn, Sb, In, with the exception of said metals M comprised in said alloy.

Component for timepiece or for jewellery made from such a light, precious gold-titanium based alloy.