Crystal for radiotelephone watch

摘要

The watch-telephone comprises a glass (1) enclosing a keyboard (2) formed of a number of capacitive sensors or conductive pads underneath the glass. Each pad corresponds to a respective digit or symbol and is individually connected to a printed circuit board (12). The glass comprises a thick area (4) in its center and an area of reduced thickness (5) at its periphery. The glass is round and the thinner area (5) forms a ring below which the keyboard is deposited. The keyboard has an opaque decorative coating (6) composed of digits and symbols and deposited directly beneath the thinner area (5).