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Electronic watch including capacitive keys on its crystal

  • US 20020060953A1
  • Filed: 11/01/2001
  • Published: 05/23/2002
  • Est. Priority Date: 11/17/2000
  • Status: Active Grant
First Claim
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1. An electronic watch including:

  • a case containing display means with hands and provided with a crystal made of dielectric material arranged in front of said hands, manual control means comprising capacitive keys each provided with at least a transparent electrode arranged on the inner face of the crystal and forming a first plate of a capacitive sensor whose second plate is formed by placing a finger of the person wearing the watch on an external face of the crystal selectively opposite at least one of said capacitive keys, said control means further including a detection device for detecting capacitance variations in said sensors and consequently generating control signals in the watch, and means for capacitive detection of position of at least one of said hands, on the basis of variations in capacitance between said hand and at least one of said transparent electrodes of the capacitive keys.

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