Sensor structure and magnetic field sensor

Details Sensor structure and magnetic field sensor Sensor structure and magnetic field sensor

2007-02-13

2007-02-13

Lefkowitz, Edward (Department: 2862)

Electricity: measuring and testing

Magnetic

Magnetometers

C338S03200R

Reexamination Certificate

active

10491994

ABSTRACT:
A method and an apparatus of a magnetic field sensor structure are disclosed. The magnetic field sensor structure is formed by a bridge of four magnetoresistors (1–4), wherein each magnetoresistor has a longitudinal direction, and each magnetoresistor (1–4) is polarised by magnets (15–19). Also, each magnet has a main magnetisation field along an axial magnetisation direction, and a magnetic leakage field. The polarisation magnets (15–19) and the magnetoresistors (1–4) are arranged in the form of layers on the same substrate. In one embodiment, the polarisation magnets (15–19) are at the same level as the magnetoresistors (1–4) wherein the polarisation magnets (15–19) have the same main magnetisation direction, which is contained in the plane of the layers. The magnetoresistors have their longitudinal direction parallel with that of the axial direction of the magnets. In one embodiment, two magnetoresistors are arranged in the axial field of magnets and two others are in the magnet leakage field.

REFERENCES:
patent: 6066947 (2000-05-01), Tamura
patent: 6075361 (2000-06-01), Coehoorn et al.
patent: 2775772 (1999-09-01), None
patent: 02017476 (1990-01-01), None
Wanjun Ku, et al., “Precision X-Y Robotic Object Handling Using a Dual GMR Bridge Sensor”, IEEE Transactions on Magnetics, vol. 36, No. 5, Sep. 2000, pp. 2782-2784.
Rapport De Recherche Internationale dated Jan. 22, 2003, PCT/FR/02/03407.

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