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Detector for electro-optical mouse

  • US 4,546,347 A
  • Filed: 06/24/1983
  • Issued: 10/08/1985
  • Est. Priority Date: 05/18/1981
  • Status: Expired due to Term
First Claim
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1. An optical mouse detector system comprising,a surface having two sets of lines, one set intersecting the other, with spaces therebetween, each set having a characteristic color and a pre-determined width, the lines and spaces having three levels of contrast, including a first level for the lines, a second level for intersections of the lines and a third level for the spaces,two linear arrays of detector cells movable relative to the surface, each linear array capable of imaging one line and one space from the surface, with one linear array parallel in orientation with one of said two sets of intersecting lines, the second linear array parallel in orientation with the other set, said detector cells having optical means associated with two adjacent detector cells in the same linear array for imaging the width of one line which is a member of the set of lines not parallel to the detector array containing said two adjacent cells, andmeans movable over the surface for measuring contrast differences, said means having inputs from two non-adjacent detector cells in the same linear array, said means having an output indicative of contrast differences for signalling line crossings corresponding to changes in contrast differences.

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