Non-contact type pattern sensor with variable clearance compensa

Details Non-contact type pattern sensor with variable clearance compensa Non-contact type pattern sensor with variable clearance compensa

1988-11-10

1990-07-24

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Displacement

32420721, 324225, 324226, 324661, G01B 714

Patent

active

049440284

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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