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Signal input sheet

  • US 5,010,213 A
  • Filed: 12/27/1989
  • Issued: 04/23/1991
  • Est. Priority Date: 12/29/1988
  • Status: Expired due to Term
First Claim
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1. A signal input sheet comprising:

  • a flexible upper laminate having a lower surface and an upper surface, said upper laminate having one of a conductive layer and a resistive layer on its lower surface as a first layer, said upper surface of the upper laminate being divided into at least one hand-written input area for the input of characters and lines and at least one binary data input area for the input of single depressions;

    a lower laminate having a lower surface and an upper surface, said lower laminate having one of a conductive layer and a resistive layer on its upper surface as a second layer, where said first layer faces said second layer and at least one of said first layer and said second layer being formed as a resistance layer;

    a plurality of insulative spacers interposed between said first layer and said second layer, said insulative spacers arranged at intervals such as to allow an electrical connection between said first layer and said second layer, where a depressing pressure on the upper surface of said upper laminate causes the electrical connection between said first layer and said second layer, said insulative spacers having a larger width in said binary data input area and having a larger spacing between adjacent insulative spacers in said binary data input area;

    a voltage source coupled between said first layer and said second layer; and

    means for detecting a position at which said depressing pressure is applied on the upper surface of said upper laminate.

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