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Laser scanning graphic input system

  • US 5,525,764 A
  • Filed: 06/09/1994
  • Issued: 06/11/1996
  • Est. Priority Date: 06/09/1994
  • Status: Expired due to Term
First Claim
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1. A graphic input system for digitizing the location of an object moving on a planar surface, comprising:

  • at least two primary scanning lasers each delivering scanning light beams from above said planar surface,a scanning mirror interposed along the path of each of said scanning light beams and each scanning mirror being controllably pivotally mounted so as to deflect the path of each of said scanning light beams,the arrangement being such that the scanning light beams from each of said primary scanning lasers is controllably driven across said planar surface through electromagnetic excitation of each scan mirror,a marking stylus arranged to be moved over said planar surface,a detecting means for detecting the impingement of each of said scanning light beams from said primary scanning lasers on said marking stylus,said detecting means for generating a trigger voltage signal, the trigger voltage signal being transmitted to a logical circuit means for enabling the reading of the instantaneous value of a position voltage signal proportional to and representative of the tangent of the scan angle of each said scanning light beam.

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