Displacement detecting apparatus comprising magnetoresistive ele

Details Displacement detecting apparatus comprising magnetoresistive ele Displacement detecting apparatus comprising magnetoresistive ele

1983-03-08

1986-10-07

Wolff, John H.

Dynamic magnetic information storage or retrieval

Head

Hall effect

324207, 324252, 338 32R, G11B 530, G01B 714, G01R 3302

Patent

active

046162810

ABSTRACT:
An apparatus for detecting a displacement of a magnetic sensor including four magnetoresistive elements with respect to a magnetic record medium having a magnetic track on which a magnetization pattern has been recorded with a given pitch is disclosed. First and second magnetoresistive elements are arranged side by side in a direction perpendicular to the direction of the magnetization pattern, and third and fourth magnetoresistive elements are arranged on the first and second magnetoresistive elements, respectively via insulating layers. The first and third magnetoresistive elements are mutually biased magnetically and second and fourth magnetoresistive elements are mutually biased magnetically. The first, second, third and fourth magnetoresistive elements are connected into a bridge circuit and diagonal points of the bridge circuit are connected to positive and negative inputs of a differential amplifier. A detection output signal representing the detected deviation is derived from the differential amplifier as a differential output.

REFERENCES:
patent: 3860965 (1975-01-01), Voegeli
patent: 3969769 (1976-07-01), Gorter et al.
patent: 4021728 (1977-05-01), Makino et al.
patent: 4361805 (1982-11-01), Narimatsu et al.
patent: 4401944 (1983-08-01), Narimatsu et al.
Feng, J. S., "Self-Biased Magnetoresistive Bridge Configuration for Current Measurement", IBM TDB, Apr. 1976, vol. 18, No. 11, pp. 3847-3851.

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