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Light pen input systems

  • US 5,959,617 A
  • Filed: 08/05/1996
  • Issued: 09/28/1999
  • Est. Priority Date: 08/10/1995
  • Status: Expired due to Term
First Claim
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1. A light pen input system, comprising:

  • (a) a light sensing device comprising a planar array of a large plurality of light sensing elements; and

    (b) a light pen which emits a light beam, the light beam producing a light spot on the array which light spot is sensed by the light sensing device, the light spot having an area corresponding to a plurality of adjacent light sensing elements, with the light beam directed perpendicular to the plane of the array, the light spot being non-circular and having a dimension in one dimension over the array different to the direction in another direction, andsaid light sensing device sensing rotation of the non-circular spot, whereby rotation of the pen by a user is sensed by the light pen system.

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