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Tablet position digitizer

  • US 5,414,226 A
  • Filed: 02/19/1993
  • Issued: 05/09/1995
  • Est. Priority Date: 02/21/1992
  • Status: Expired due to Term
First Claim
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1. A digitizer constituted by a tablet and a position indicator to determine coordinates indicated by said position indicator on said tablet, comprising:

  • a set of coordinate determining conductor groups arranged on said tablet;

    a first set of oscillation elements, having at least a first element and a second element, arranged on said tablet;

    at least a second oscillation element coupled to said first set of oscillation elements, said second oscillation element having an input and an output wherein said input of said second oscillation element is connected to said first element of the first set of oscillation elements and said output of said second oscillation element is connected to said second element of the first set of oscillation elements; and

    a third oscillation element arranged on said position indicator,wherein when said position indicator is placed at an arbitrary position on said tablet, said first set of oscillation elements, said second oscillation element, and said third oscillation element constitute an oscillator system to generate a coordinate signal such that the coordinates indicated by said position indicator are determined based on a plurality of signals generated in the coordinate determining conductor groups by causing magnetic fields and electric fields, generated by said position indicator when said oscillator system oscillates, to act on said coordinate determining conductors groups.

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