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Position detection device, position pointing device, position detecting method and pen-down detecting method

  • US 6,714,311 B2
  • Filed: 08/03/2001
  • Issued: 03/30/2004
  • Est. Priority Date: 08/04/2000
  • Status: Expired due to Fees
First Claim
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1. A position detection device comprising a position pointing means having a light reflection means:

  • a light emitting means for emitting light to said light reflection means of said position pointing means;

    a light receiving means for receiving light from said light reflection means of said position pointing means; and

    a coordinate calculation means for calculating the position coordinate of said position pointing means based on information from said light receiving means, said position detection device being characterized in that;

    said position pointing means has a pen-like shape, and has a movable pen-core portion changeable in its position according to the pressing pressure against the surface of a board, and a light modulation means for changing the characteristics of the reflection light, and a transmission means for transmitting to said light modulation means the displacement of said movable pen-core portion;

    said light receiving means has an up/down state detection means for obtaining up- and down-state information of said position pointing means by detecting the characteristics of light which have been changed by said light modulation means; and

    wherein said light receiving means comprises at least two detection means with a predetermined space being provided therebetween, for obtaining information on incident angles of the light coming from said light reflection means, and said coordinate calculation means is adapted to calculate the position of said position pointing means based on a triangular principle from at least two incident angle information.

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