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Pen input device

  • US 5,444,193 A
  • Filed: 09/20/1993
  • Issued: 08/22/1995
  • Est. Priority Date: 09/21/1992
  • Status: Expired due to Term
First Claim
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1. A pen input device comprising:

  • a) a tablet having a top surface, and a plurality of reference lines provided at a constant pitch on the top surface in mutually perpendicular directions; and

    b) a pointing device having;

    1) a tip end,2) first means for radiating light on said tablet via the tip end, and3) second means including a single sensor for detecting both A) and B) based on scattered light received from said tablet;

    A) a moving direction and a quantity of moving distance of the tip end of said pointing device on said tablet; and

    B) a distance between the tip end of said pointing device and the top surface of said tablet.

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