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Human-machine interface apparatus

  • US 4,071,691 A
  • Filed: 08/24/1976
  • Issued: 01/31/1978
  • Est. Priority Date: 08/24/1976
  • Status: Expired due to Term
First Claim
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1. A human-machine interface apparatus for inputting information to a utilization device, comprising:

  • means for defining a surface of predetermined length and having a reference point thereon;

    field-establishing means for establishing a low level electric field above said surface and along said predetermined length and into which a human finger can be inserted to touch a selected point on said surface and traverse a path therealong, said electric field having a parameter that varies continuously along said predetermined length as a function of distance from said reference point; and

    detector means for detecting the position of said touched point on said surface and the path traversed thereby with respect to said reference point and producing an electrical signal corresponding thereto as an input signal to said utilization device.

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