Magnetic detection apparatus

Details Magnetic detection apparatus Magnetic detection apparatus

1983-03-08

1986-07-29

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Head

Hall effect

324225, 324252, 338 32R, G11B 5127, G11B 533

Patent

active

046033653

ABSTRACT:
A magnetic detection apparatus for use in an encoder includes a first magnetic sensor for detecting an external magnetic field and a second magnetic sensor for detecting a signal magnetic field. The first magnetic sensor is constructed by two magnetoresistive elements and a conductive layer arranged therebetween for applying a magnetic bias thereto. The second magnetic sensor is constructed by two magnetoresistive elements, first conductive layer arranged therebetween for applying a magnetic bias thereto and second conductive layer arranged on one side of two magnetoresistive elements for canceling an effect of the external magnetic field by feeding back a differential output derived from the first magnetic sensor thereto. In such a construction, it is possible to derive from the second magnetic sensor only a signal representing the signal magnetic field without being affected by the external magnetic field.

REFERENCES:
patent: 3757154 (1973-09-01), Okita
patent: 3969769 (1976-07-01), Gorter
patent: 3979775 (1976-09-01), Schwarz
patent: 4184631 (1980-01-01), Lazzari
patent: 4212041 (1980-07-01), Lazzari
patent: 4380735 (1983-04-01), Bell

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