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Stylus for optical digitizer

  • US 6,441,362 B1
  • Filed: 10/28/1999
  • Issued: 08/27/2002
  • Est. Priority Date: 06/13/1997
  • Status: Expired due to Fees
First Claim
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1. An optical stylus having a point light movable along a coordinate plane according to a drawing operation and being used as an input device for an optical digitizer which converts the point light into an electric signal to compute coordinates of a position of the point light, the optical stylus comprising:

  • a holder portion that may be manually manipulated to perform the drawing operation;

    a tip portion protruding from the holder portion and forming the point light, the tip portion comprising a plurality of light-emitting members each for emitting light of a different color and a light guide member for encapsulating the light-emitting members, the light guide member comprising a transparent material having a tubular configuration having a closed tip end, an open end, an outer face and an inner face, the light-emitting members being mounted in the open end, and at least one of the outer face and the inner face being patterned to scatter the light emitted from the light-emitting members; and

    writing force detecting means for detecting a writing force applied to the tip portion and controlling the respective light-emitting members to emit light depending upon the detected writing force.

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