A timepiece glass, in particular a watch glass, wherein it comprises an optical device comprising at least one lens intended to enlarge an indication supplied by a timepiece, said lens comprising at least one aspherical face comprising at least one section passing through a vertical plane comprising an optical axis of vertical direction z, of which at least one outline can be defined by the following equation:

[00001]$z\left(r\right)=\frac{r^2}{R\left(1+\sqrt{1-\left(1-\right).Math..Math.\frac{r^2}{R^2}}\right)}+{}_4.Math.r^4+{}_6.Math.r^6+\mathrm{.Math.}$

in which R is the nominal radius of curvature, k is the constant of conicity, and .sub.(4,6, . . . ) is or are coefficient(s) of asphericity, and in which at least the constant of conicity k and/or at least one coefficient of asphericity is different from zero.

Watch glass (1) including a first element (2) made of a first material and a second element (3) made of a second material different from the first, more elastic than the first material, the second element (3) includes a skirt (3b) in its lower part, and the two elements (2, 3) are fixed to each other so that the first element (2) is oriented toward the exterior of a watch and the skirt of the second element (3) is adapted for the assembly of the watch glass (1) to a watch middle (4).

A method for structuring a decorative or technical pattern in the thickness of an object made of an at least partially transparent amorphous, semi-crystalline or crystalline material, wherein the object is made of an at least partially transparent material including a top surface and a bottom surface which extends away from the top surface. The top or bottom surfaces is provided with a mask defining an opening whose outline corresponds to the profile of the pattern to be structured, the mask covering the top or bottom surface at the positions which are not to be structured. The pattern is structured with a mono- or multicharged ion beam through the opening of the mask, wherein the mechanical properties of the mask are sufficient to prevent the ions of the ion beam from etching the top or bottom surface at the positions where this top or bottom surface is covered by the mask.

The invention relates to a watch glass which comprises a support glass having at least one recess; a cover glass; at least one gemstone which is at least in part disposed in the recess; and a connecting intermediate layer by way of which the cover glass and the support glass are connected to one another. A region of an upper par of the gemstone is in direct contact with the intermediate layer. The invention furthermore relates to a watch having a watch glass of this type as well as to a method for producing a watch glass of this type.

The invention relates to a watch glass which comprises a support glass having at least one recess; a cover glass; at least one gemstone which is at least in part disposed in the recess; and a connecting intermediate layer by way of which the cover glass and the support glass are connected to one another. A region of an upper par of the gemstone is in direct contact with the intermediate layer. The invention furthermore relates to a watch having a watch glass of this type as well as to a method for producing a watch glass of this type.

An isothermal device (1) for mechanical and/or functional components (5) of a watch (10), including a case (2) provided with an enclosure (4) wherein a case (12) of the watch (10) can be removably arranged, a crystal (11) arranged facing a crystal (6) of the case (2), the device (1) comprising: a reversible fastening device (13) fastening the watch (10) case (12) in the enclosure (4) by keeping it away from functional elements (15) of the case (2), the elements (15) forming the enclosure (4) comprising a middle (9a), a back (9b) and the variable-opacity crystal (6) of the case (2), and a system (3) for dynamically controlling the temperature of the enclosure (4) comprising the variable-opacity crystal (6) and a control unit (8) configured to control the opacity of the crystal (6) of the case (2).

An isothermal device (1) for mechanical and/or functional components (5) of a watch (10), including a case (2) provided with an enclosure (4) wherein a case (12) of the watch (10) can be removably arranged, a crystal (11) arranged facing a crystal (6) of the case (2), the device (1) comprising: a reversible fastening device (13) fastening the watch (10) case (12) in the enclosure (4) by keeping it away from functional elements (15) of the case (2), the elements (15) forming the enclosure (4) comprising a middle (9a), a back (9b) and the variable-opacity crystal (6) of the case (2), and a system (3) for dynamically controlling the temperature of the enclosure (4) comprising the variable-opacity crystal (6) and a control unit (8) configured to control the opacity of the crystal (6) of the case (2).

An embodiment of an electronic timepiece includes a cylindrical exterior case, a bezel and a windshield member. In the exterior case, a circuit board is housed. The bezel is formed of a metal material to be ring-shaped, includes an inward flange part that projects from an inner side surface toward a center of the ring-shaped bezel, is arranged on an outer upper side of the exterior case and is electrically connected with the circuit board. The windshield member is formed of a transparent dielectric substance, arranged in the bezel and supported by the inward flange part. The bezel is configured to resonate with a radio wave having a desired frequency by adjustment of at least one of (i) a relative permittivity of the dielectric substance and (ii) an area of an overlap region where the inward flange part and the windshield member overlap each other.

An embodiment of an electronic timepiece includes a cylindrical exterior case, a bezel and a windshield member. In the exterior case, a circuit board is housed. The bezel is formed of a metal material to be ring-shaped, includes an inward flange part that projects from an inner side surface toward a center of the ring-shaped bezel, is arranged on an outer upper side of the exterior case and is electrically connected with the circuit board. The windshield member is formed of a transparent dielectric substance, arranged in the bezel and supported by the inward flange part. The bezel is configured to resonate with a radio wave having a desired frequency by adjustment of at least one of (i) a relative permittivity of the dielectric substance and (ii) an area of an overlap region where the inward flange part and the windshield member overlap each other.

The present invention concerns a holographic display device incorporated in a timepiece device comprising at least one movable hand, having a light source at its peripheral end, and a watch glass comprising at least one hologram at its periphery, said light source being arranged on the hand so that it reconstructs said hologram when it moves into a predetermined angular sector.