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Input pen and input device

  • US 7,528,825 B2
  • Filed: 12/08/2004
  • Issued: 05/05/2009
  • Est. Priority Date: 12/08/2003
  • Status: Expired due to Fees
First Claim
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1. An input pen in use for an input device comprising:

  • a first member;

    a second member that moves together with a pen tip and touches the first member; and

    a pen pressure detecting circuit that detects an amount of a pen pressure that is applied to the pen tip, based on a touch area between the first member and the second member,wherein the first member is a spring that has a diameter of spirals that becomes smaller as a distance from the pen tip increases and varies the touch area according to a movement of the pen tip; and

    the second member is a resistance film having a resistance that depends on the touch area.

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