A mechanical or electromechanical timepiece including a watch case delimiting an internal volume, the watch case including a back delimiting the watch case at the bottom; a crystal closing the watch case at the top, the crystal defining a useful display aperture; a middle part connecting the back and the crystal to one another; a horological movement housed in the internal volume of the watch case; at least one hand for displaying information visible via a useful display aperture and rotated with respect to the watch case by the horological movement with at least one driving belt extending at least partially in the useful display aperture, the timepiece includes the internal volume of the watch case filled with a fluid wherein at least one driving belt is submerged, and wherein the driving belt is made of a material wherein the optical refractive index is equal or substantially equal to that of the fluid.

A mechanical or electromechanical timepiece including a watch case delimiting an internal volume, the watch case including a back delimiting the watch case at the bottom; a crystal closing the watch case at the top, the crystal defining a useful display aperture; a middle part connecting the back and the crystal to one another; a horological movement housed in the internal volume of the watch case; at least one hand for displaying information visible via a useful display aperture and rotated with respect to the watch case by the horological movement with at least one driving belt extending at least partially in the useful display aperture, the timepiece includes the internal volume of the watch case filled with a fluid wherein at least one driving belt is submerged, and wherein the driving belt is made of a material wherein the optical refractive index is equal or substantially equal to that of the fluid.

The invention is a two-stage speed increaser arrangement comprising force transmission members having a first, second, third and fourth pitch surface (100A, 100B, 100a, 100b), wherein the first pitch surface (100A) and the third pitch surface (100a) having a common first line segment (102A) and the second pitch surface (100B) and wherein the fourth pitch surface (100b) having a common second line segment (102B).

The two-stage speed increaser arrangement is characterised in that considering as an origin (T1), of an orthogonal coordinate system in a plane (104) perpendicular to the second line segment (102B), a projection of the second line segment (102B) to the plane (104), and considering that the Y axis of the coordinate system is pointing in the direction of a projection point (TO) of a point (D) of the first line segment (102A) to the plane (104), the following Formula 1 is satisfied at all times for the arrangement, in a coordinate system defined for each point (D) of the first line segment (102A):

x(((y′+d)x−x′y)(x.sup.2+y.sup.2−dy)+d.sup.2xy)≥0,  Formula 1

wherein
d is the distance of the projection point (T0) from the origin (T1),
x and y are the coordinates of a projection point (K), as projected to the plane (104), of an arbitrary tooth contact point (P) within any tooth contact region of the first pitch surface (100A) and the third pitch surface (100a), and
x′ and y′ are the coordinates of the projection point (K′), as projected to the plane (104), of an arbitrary tooth contact point (P′) situated along any tooth contact region of the second pitch surface (100B) and the fourth pitch surface (100b).

The invention is furthermore a gear train satisfying the above formula.

The invention is a two-stage speed increaser arrangement comprising force transmission members having a first, second, third and fourth pitch surface (100A, 100B, 100a, 100b), wherein the first pitch surface (100A) and the third pitch surface (100a) having a common first line segment (102A) and the second pitch surface (100B) and wherein the fourth pitch surface (100b) having a common second line segment (102B).

The two-stage speed increaser arrangement is characterised in that considering as an origin (T1), of an orthogonal coordinate system in a plane (104) perpendicular to the second line segment (102B), a projection of the second line segment (102B) to the plane (104), and considering that the Y axis of the coordinate system is pointing in the direction of a projection point (TO) of a point (D) of the first line segment (102A) to the plane (104), the following Formula 1 is satisfied at all times for the arrangement, in a coordinate system defined for each point (D) of the first line segment (102A):

x(((y′+d)x−x′y)(x.sup.2+y.sup.2−dy)+d.sup.2xy)≥0,  Formula 1

wherein
d is the distance of the projection point (T0) from the origin (T1),
x and y are the coordinates of a projection point (K), as projected to the plane (104), of an arbitrary tooth contact point (P) within any tooth contact region of the first pitch surface (100A) and the third pitch surface (100a), and
x′ and y′ are the coordinates of the projection point (K′), as projected to the plane (104), of an arbitrary tooth contact point (P′) situated along any tooth contact region of the second pitch surface (100B) and the fourth pitch surface (100b).

The invention is furthermore a gear train satisfying the above formula.

The method makes it possible to produce a decorated element for a timepiece or piece of jewelry. This decorated element may be, for example, a watch dial. The method includes the steps of taking a base substrate, and micromachining on said base substrate a mould or decorative partitions in a programmed pattern, and filling the mould or the decorative partitions with at least one filler material to obtain the decorated element. The filler material may be enamel.

A mechanical or electromechanical timepiece including a watch case delimiting an internal volume, the watch case including a back delimiting the watch case at the bottom; a crystal closing the watch case at the top, the crystal defining a useful display aperture; a middle part connecting the back and the crystal to one another; a horological movement housed in the internal volume of the watch case; at least one hand for displaying information visible via a useful display aperture and rotated with respect to the watch case by the horological movement with at least one driving belt extending at least partially in the useful display aperture, the timepiece includes the internal volume of the watch case filled with a fluid wherein at least one driving belt is submerged, and wherein the driving belt is made of a material wherein the optical refractive index is equal or substantially equal to that of the fluid.

An electronic device is provided. The electronic device includes a housing including a first face that faces in a first direction, a second face that faces in a second direction that is opposite to the first direction, and a side face that at least partially encloses a space between the first face and the second face, a transparent substrate that forms at least a portion of the first face of the housing, a display disposed within the space of the housing, and exposed through at least a portion of the transparent substrate, a mechanical watch structure at least partially disposed between the transparent substrate and the display, and configured to be physically movable, at least one processor electrically connected to the display and the mechanical watch structure, and a memory electrically connected to the at least one processor. The memory may store instructions that, when executed, cause the at least one processor to control the display and the mechanical watch structure.

An electronic device is provided. The electronic device includes a housing including a first face that faces in a first direction, a second face that faces in a second direction that is opposite to the first direction, and a side face that at least partially encloses a space between the first face and the second face, a transparent substrate that forms at least a portion of the first face of the housing, a display disposed within the space of the housing, and exposed through at least a portion of the transparent substrate, a mechanical watch structure at least partially disposed between the transparent substrate and the display, and configured to be physically movable, at least one processor electrically connected to the display and the mechanical watch structure, and a memory electrically connected to the at least one processor. The memory may store instructions that, when executed, cause the at least one processor to control the display and the mechanical watch structure.

The method makes it possible to produce a decorated element for a timepiece or piece of jewelry. This decorated element may be, for example, a watch dial. The method includes the steps of taking a base substrate, and micromachining on said base substrate a mold or decorative partitions in a programmed pattern, and filling the mold or the decorative partitions with at least one filler material to obtain the decorated element. The filler material may be an epoxy resin and the mold or the partitions are obtained by melting and solidifying a solder paste or powder.

An electronic device is provided. The electronic device includes a housing including a first face that faces in a first direction, a second face that faces in a second direction that is opposite to the first direction, and a side face that at least partially encloses a space between the first face and the second face, a transparent substrate that forms at least a portion of the first face of the housing, a display disposed within the space of the housing, and exposed through at least a portion of the transparent substrate, a mechanical watch structure at least partially disposed between the transparent substrate and the display, and configured to be physically movable, at least one processor electrically connected to the display and the mechanical watch structure, and a memory electrically connected to the at least one processor. The memory may store instructions that, when executed, cause the at least one processor to control the display and the mechanical watch structure.