Device for detecting magnetized areas

Details Device for detecting magnetized areas Device for detecting magnetized areas

1989-02-27

1991-01-08

Albritton, C. L.

Electrical resistors

Resistance value responsive to a condition

Magnetic field or compass

360113, H01L 4300

Patent

active

049839454

ABSTRACT:
A magnetic field can be detected by moving magnetized areas past a magnetoresistor, which responds to the changing magnetic field. The sensitivity to magnetic fields is limited by the width of the magnetoresistors used. To optimize the sensitivity, two spaced-apart ferromagnetic pole pieces (6, 7) are so disposed between the magnetoresistor and the magnetized areas that their ends (8, 9) at the magnetoresistor (4) form a first gap (10) having a width (11) on the order of the width (12) of the magnetoresistor (4), and that their ends (13, 14) at the magnetized areas form a second, considerably narrower gap (16).

REFERENCES:
patent: 4413296 (1983-11-01), Jeffers
patent: 4644430 (1987-02-01), French
U. Dibbern und A. J. Petersen bearbeitet von C.-H. Kramp, "Magnetoresistive Sensoren," Elektronik Wir bauen die Elemente Valvo, Technische Information 840323, 1984.
von Dibbern, U. et al., "Magnetoresistive Sensoren," Elektronik. Wir bauen die Elemente. VALVO, Mar. 23, 1984.

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