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Switching mechanism for electronic wristwatch

  • US 4,091,610 A
  • Filed: 01/06/1977
  • Issued: 05/30/1978
  • Est. Priority Date: 05/08/1974
  • Status: Expired due to Term
First Claim
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1. A switching mechanism for an electronic wristwatch including an oscillator, a main circuit, a display unit, a casing, a rear frame made of conductive material and a front glass, comprising:

  • a. a thin-film transparent electrode provided on the front glass;

    b. a switching circuit having a control terminal connected to said transparent electrode for selectively interconnecting said transparent electrode to ground through stray capacitance and an input terminal provided with an enabling signal from said main circuit and providing an output control signal in response to such selective interconnection; and

    c. a control circuit for controlling an operation mode of the electronic wristwatch in response to said output control signal from the switching circuit;

    said switching circuit comprising an RS flip-flop having first and second output terminals, one of which comprises said control terminal and an exclusive OR gate connected at its input to said first and second output terminals and having an output terminal for carrying said output control signal.

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