×

Data entry system

  • US 4,013,835 A
  • Filed: 10/23/1975
  • Issued: 03/22/1977
  • Est. Priority Date: 10/23/1975
  • Status: Expired due to Term
First Claim
Patent Images

1. In a data entry system wherein data is entered by depressing locations on a touch sensitive device, apparatus for identifying a depressed location comprising:

  • a matrix of conductors comprising a plurality of first conductors oriented in a first direction, a plurality of second conductors oriented in a second direction transverse to said first directions;

    a plurality of pressure sensitive electroconductive means for conducting electrical current between respective first and second conductors, each said pressure sensitive electroconductive means being operative to conduct an electrical current when the location immediate thereto has been depressed;

    means for sequentially testing each pressure sensitive electroconductive means for the existence of the current that is established between a respective first conductor and a respective second conductor when the location immediate thereto has been depressed; and

    means, responsive to said testing means, for terminating the testing of each pressure sensitve electroconductive means when a deprressed location has been identified, said terminating means comprising;

    means, responsive to said testing means, for generating a status signal indicative of a depressed location having been identified,means for applying the status signal to said means for sequentially testing each electroconductive means so as to terminate the sequential testing, andmeans for temporarily maintaining the signal level of the generated status signal after the location is no longer depressed.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×