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Watch including a manual control device

  • US 5,453,960 A
  • Filed: 03/22/1995
  • Issued: 09/26/1995
  • Est. Priority Date: 03/24/1994
  • Status: Expired due to Term
First Claim
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1. A watch comprising a case constituting ground, a glass and at least one manual control device, which is connected to a processing circuit for executing a predetermined watch function by the action of said manual control device, said manual control device comprising:

  • a capacitive sensor comprising a first armature placed on an internal face of the glass such that another armature is selectively formed by the positioning of a finger of a user of said watch on the external face of the glass, said capacitive sensor thereby forming a first capacity, and said watch also having a parasitic second capacity between said first armature and the case,a voltage-frequency converter whose input is connected to a common junction between said first armature and said second capacity,and a frequency detector connected between said converter and said processing circuit, so that the oscillation frequency of said converter varies as a function of the presence or absence of the user'"'"'s finger on said external face of the glass.

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