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Position detector

  • US 5,466,896 A
  • Filed: 04/29/1992
  • Issued: 11/14/1995
  • Est. Priority Date: 11/01/1989
  • Status: Expired due to Term
First Claim
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1. A position detector for determining the coordinate values of a position specified by a position indicator using an electromagnetic effect between a sensing unit including plural groups of several loop coils juxtaposed in the direction of position detection, the position indicator having at least one coil, comprising a selection means for simultaneously selecting a loop coil from each of the plural groups including loop coils juxtaposed in sequence out of said several loop coils whereby the relative positions of selected coils are not identical or symmetrical in each group or between groups except those within a predetermined limit, and an identifying means for identifying the loop coil on which the position indicator is located in response to a pattern of signal amplitudes obtained by said loop coil selection means.

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