Device for assembling a touch-type crystal on a case
The crystal ( 10 ), in the inner surface of which contact zones ( 17 ) are structured, includes close to its edge a hollow ( 14 ) machined in one of its faces ( 11, 12 ) or a groove ( 25 ) machined in its thickness and provided with an enamel deposition ( 20 ) for concealing said contact zones ( 17 ) after bonding.
1. A device including a display visible through a tactile crystal, wherein the crystal is assembled on a shoulder of an aperture of a case without employing a bezel and the crystal extends to an outer surface of the case, wherein the crystal is made of a transparent material resistant to temperatures higher than 500° C., and the crystal includes on an inner face thereof transparent electrodes forming sensors, wherein the transparent electrodes are connected by conductive paths to contact zones located in a connection area close to an edge of the crystal opposite ends of connectors of an electronic module contained in a compartment of the case, wherein a portion of the edge of the crystal is formed by a deposition of enamel, and at least one part of the surface of the enamel deposition conceals the connection area so that assembly of the crystal on the case is achieved without covering the crystal by a bezel.
2. The device according to claim 1 , wherein the enamel deposition is carried out in a hollow machined in the inner face of the crystal at least at the connection area.
3. The device according to claim 1 , wherein the enamel deposition is carried out in a groove machined in a thickness of the crystal at least at the connection area.
4. The device according to claim 1 , wherein the transparent material forming the crystal is a monocrystalline material or polycrystalline material.
5. The device according to claim 4 , wherein the material forming the crystal is sapphire.
6. The device according to claim 4 , wherein the transparent material forming the crystal is selected from the group consisting of quartz, spinelle and corundum.
7. The device according to claim 1 , wherein the transparent material forming the crystal is an amorphous material.
8. The device according to claim 7 , wherein the transparent material forming the crystal is a mineral glass.
9. The device according to claim 1 , wherein a hue of the enamel layer matches that of the case.
10. The device according to claim 1 , wherein the tactile crystal is assembled on the shoulder of the case by bonding.
11. The device according to claim 1 , wherein the compartment of the case further contains a watch movement and a dial to form a timepiece with at least partially tactile control.
12. A method of manufacturing a tactile crystal of a transparent material resistant to temperatures higher than 500° C., wherein the tactile crystal includes on an inner face thereof a conductive network including electrodes, conductive paths and contact zones forming a connection area, the method including the steps of:
(a) machining a hollow in an inner face of a crystal, or a groove in a thickness thereof, whose contour at least substantially corresponds to that of a connection area;
(b) forming an enamel deposition in the hollow or in the groove;
(c) polishing a surface of the enamel deposition and a non-enamelled surface of the crystal to place each at the same level; and
(d) structuring a conductive network on an inner enamelled surface and non-enamelled surface of the crystal so that the tactile crystal is configured for assembling to a shoulder of an aperture of a case without employing a bezel.
13. The device according to claim 1 , wherein the conductive paths are transparent and the contact zones are transparent.
14. The method according to claim 12 , wherein the conductive network is transparent.
15. The method according to claim 14 , wherein the electrodes are transparent, the conductive paths are transparent and the contact zones are transparent.