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Relative manipulated variable input device

  • US 5,815,139 A
  • Filed: 04/29/1997
  • Issued: 09/29/1998
  • Est. Priority Date: 05/01/1996
  • Status: Expired due to Term
First Claim
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1. A relative manipulated variable input device comprising:

  • a tablet sheet formed by a pair of opposed tablet film sheets and disposed in parallel with a very small gap defined therebetween;

    a control button disposed above said tablet sheet so that, when tilted in a desired direction while being depressed, said control button presses said tablet sheet continuously at different positions;

    position detecting means for detecting, as a pressed position, a position of contact between said pair of tablet film sheets by depression of said control button;

    contact resistance detecting means for detecting a contact resistance value at said pressed position; and

    reference position setting means for storing a first pressed position of said tablet sheet as a reference position at least until a force applied to said control button is removed,wherein output data, representing a direction and an amount of tilt of said control button when said button is depressed, is generated using said contact resistance value and relative position data calculated from a difference between said pressed position and said reference position.

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