Magnetic sensor and position detector

Details Magnetic sensor and position detector Magnetic sensor and position detector

1992-03-17

1993-09-07

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

32420722, 324252, 338 32R, 307309, G01B 714, G01R 3306

Patent

active

052432807

ABSTRACT:
A magnetic sensor is disposed in an opposing relation to a magnetic scale in which a flat surface scale base made of a glass is plated by a magnetic material and a resultant plated layer is magnetized at a constant grating pitch. The magnetic sensor includes two magnetoresistance effect element groups disposed symmetrically with respect to a common central line. Since the surface of the magnetic scale is smooth, a clearance between the magnetic sensor and the magnetic scale can be kept substantially constant. When the magnetic sensor is moved in an opposing relation to the magnetic scale, a rise of temperature in the magnetoresistance effect elements is compensated for by the above symmetrical layout of the two magnetoresistance effect element groups. Therefore, when the magnetic sensor is moved over the magnetic scale in one direction and in the opposite direction, a dc fluctuation component in an output circuit can be reduced and the output circuit can generate a sine wave output of a constant amplitude having less waveform distortion.

REFERENCES:
patent: 4039936 (1977-08-01), Jones et al.
patent: 4480248 (1984-10-01), Sado et al.
patent: 4801881 (1989-01-01), Kawata
patent: 4806860 (1989-02-01), Iijima et al.
patent: 4818939 (1989-04-01), Takahashi et al.

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