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Non-contact type pattern sensor with variable clearance compensation

  • US 4,944,028 A
  • Filed: 11/10/1988
  • Issued: 07/24/1990
  • Est. Priority Date: 12/28/1985
  • Status: Expired due to Fees
First Claim
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1. An improved non-contact type pattern sensor, comprising:

  • a magnetic resistor element arranged facing a pattern track on a recording medium having a magnetized pattern in said pattern track and having a resistance which varies as a function of a magnetic field of a facing portion of said pattern track;

    a clearance sensor arranged near said recording medium and generating a detection signal indicative of the distance between said clearance sensor and said recording medium;

    a control unit connected to said clearance sensor and generating an output signal in response to said detection signal; and

    a piezo-electric element connected to said control unit and holding said magnetic resistor element, said piezo-electric element moving said magnetic resistor element towards and away from said magnetized pattern on said recording medium as a function of said output voltage.

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