Magnetic encoder for detection of incremental and absolute value

Details Magnetic encoder for detection of incremental and absolute value Magnetic encoder for detection of incremental and absolute value

1988-02-24

1989-07-25

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Displacement

324252, 307309, 338 32R, G01B 714, H01L 4308

Patent

active

048517712

ABSTRACT:
A magnetic encoder for detecting the speed of an actuator adapted to carry out rotational movement or linear movement by a magneto-resistor is disclosed. This magnetic encoder is intended to carry out output conversion by using a stripe-shaped magneto-resistor located close to a magnetic medium with respect to a periodic magnetic field coming out of the magnetic medium on which at least one track of magnetization patterns are recorded by a pitch p in order to generate the periodic magnetic field depending on the required position reading accuracy. When the unit stripe length of the magneto-resistor is represented by l and the closest distance between the magnetic medium and the magneto-resistor is represented by g, the angle .alpha. defined between the longitudinal direction of the stripe and the surface of the magnetic medium located at the closest part ranges from ##EQU1## to 90 degrees and the lateral direction of the stripe is oriented parallel to the direction of the magnetic field from the magnetization patterns.

REFERENCES:
patent: 4274053 (1981-06-01), Ito et al.
patent: 4319188 (1982-03-01), Ito et al.

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