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Apparatus for detecting X and Y coordinates of input points

  • US 4,319,078 A
  • Filed: 03/11/1980
  • Issued: 03/09/1982
  • Est. Priority Date: 04/02/1979
  • Status: Expired due to Term
First Claim
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1. In an apparatus for detecting X and Y coordinates of input points comprising an input surface including a first parallel electrode group and a second, flexible parallel electrode group opposing and intersecting the first parallel electrode group, a first resistor being in electrical contact with electrode conductors of the first parallel electrode group at one end thereof, a second resistor being in electrical contact with electrode conductors of the second parallel electrde group at one end thereof, and electrical detection means for detecting the input position on the input surface by using electrical signals generated from the first and second resistors, the improvement which comprises a pressure conductive rubber sheet interposed between the first and second parallel electrode groups, said sheet being rendered conductive upon application of pressure to the input surface, and means provided in said electrical detection means for detecting currents flowing through said first and said second resistors,whereby said X and Y coordinates of input points are detected by measuring said currents flowing through said first and second resistors.

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