Position-detecting sensor for detecting position of a moving obj

Details Position-detecting sensor for detecting position of a moving obj Position-detecting sensor for detecting position of a moving obj

1985-08-06

1987-06-30

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Displacement

324252, 324260, 338 32R, G01B 714, G01B 728

Patent

active

046773770

ABSTRACT:
A position-detecting sensor comprises a magnetic recording medium carried on a moving object and having a signal track recording a magnetic signal, a first MR element disposed nearby the magnetic recording medium and varying its internal resistance by sensing the magnetism of the magnetic recording medium, and a magnetic sensor electrically picking up resistance variation of the MR element and detecting the magnetic signal of the magnetic recording medium. In the position-detecting sensor, the present invention is arranged by providing a second magnetic signal track on the magnetic recording medium in addition to the signal track, disposing a second MR element nearby the second magnetic signal track. The variation of a gap between the magnetic recording medium and the magnetic sensor is detected as resistance variation of the second MR element. And the detected signal is serviceable as correcting the output picked up by the first MR element.

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patent: 4589038 (1986-05-01), Radtke
patent: 4599561 (1986-07-01), Takahashi et al.

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