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Key input circuit and portable terminal input device

  • US 6,639,159 B2
  • Filed: 12/13/2002
  • Issued: 10/28/2003
  • Est. Priority Date: 12/14/2001
  • Status: Expired due to Fees
First Claim
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1. A key input device comprising:

  • a wiring substrate; and

    a plurality of keys disposed on the wiring substrate and each having three-dimensional displacement surfaces capable of being displaced in a linked fashion relative to one another;

    the three-dimensional displacement surfaces being;

    a preceding displacement surface capable of undergoing a first displacement preceding in time; and

    a succeeding displacement surface capable of undergoing a second displacement subsequent in time to the first displacement of the preceding displacement surface;

    the succeeding displacement surface being capable of undergoing the second displacement by a displacing force of the first displacement;

    the plurality of keys each having;

    a first key forming the preceding displacement surface; and

    a second key having the succeeding displacement surface;

    a first switching operation being brought about when a first key part of the first key and a first substrate part of the wiring substrate are brought into mechanical contact with each other on the basis of displacement of the preceding displacement surface;

    a second switching operation being brought about when a second key part of the second key and a second substrate part of the wiring substrate are brought into mechanical contact with each other on the basis of displacement of the succeeding displacement surface;

    each of the keys executing the first and second switching operations by movement of its part perpendicular to the substrate surface of the wiring substrate; and

    the preceding and succeeding displacement surfaces each forming, before displacement, a convex surface in a direction opposite to the direction of the movement.

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