Non-contact type pattern sensor with variable clearance compensation
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United States of America Patent
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Jul 24, 1990
Issued Date -
N/A
app pub date -
Nov 10, 1988
filing date -
Dec 28, 1985
priority date (Note) -
Expired
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Abstract
An improved non-contact type pattern sensor includes a magnetic resistor element arranged facing a pattern track on a recoridng medium having a magnetized pattern in the pattern track. A clearance sensor is arranged to face the pattern track on the recording medium and generates a detection signal as a function of the distance between the clearance sensor and the pattern track. The control unit connected to the clearance sensor generates an output signal which varies as a function of the detection signal. A magnetic field generator connected to the control unit is arranged near the magnetic sensor element and generates a bias magnetic field whose intensity varies as a function of the output signal.
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