Magnetic detector having a bias magnet and magnetoresistive elem

Details Magnetic detector having a bias magnet and magnetoresistive elem Magnetic detector having a bias magnet and magnetoresistive elem

1995-03-01

1997-07-01

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Displacement

32420725, 338 32R, G01P 3488, G01B 714, G01D 5245, H01L 4308

Patent

active

056442262

ABSTRACT:
A magnetic detector which is small in size and is capable of preventing the occurrence of deformation in the waveform representing a change in the resistance. A bias magnet 2 is adhered to the support plate 1. A bias magnetic field is generated by the bias magnet 2 toward a gear 7. A substrate 3 is adhered onto the support plate 1, and magneto resistance elements are formed on the substrate 3 by vacuum evaporation. The magneto resistance elements are disposed in parallel with the magnetized surface of the bias magnet 2. The magneto resistance elements are disposed being tilted by about 45 degrees with respect to a vector that is in parallel with the N-pole surface of the bias magnet 2 in the bias magnetic field and is directed toward the outer peripheral edge. Due to the revolution of the gear 7, a change in the resistance takes place in the magneto resistance elements due to a change in the vector which is parallel with the N-pole surface of the bias magnet 2 in the bias magnetic field generated by the bias magnet 2 towards gear 7 and is directed toward the outer peripheral edge.

REFERENCES:
patent: 4712064 (1987-12-01), Eckardt et al.
patent: 5021736 (1991-06-01), Gonsalves et al.
patent: 5134371 (1992-07-01), Watanabe et al.
patent: 5351028 (1994-09-01), Krahn

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