Magnetic encoder

Details Magnetic encoder Magnetic encoder

2006-11-28

2008-03-04

Patidar, Jay M (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

C324S207240, C324S207220

Reexamination Certificate

active

07339369

ABSTRACT:
A magnetic encoder having a magnetic sensor composed of SVGMR elements, in which a signal output with a cycle equal to or less than a third of a cycle of magnetic patterns on a magnetic medium. The magnetic encoder comprises the magnetic medium, on which first magnetic regions and second magnetic regions are oppositely magnetized along the medium extending and disposed successively and alternately with each other, and the sensor that has three SVGMR elements or more and is movable relatively to the medium along the medium extending. Magnetizations of pinned magnetization layers of all the SVGMR elements are directed in the same direction along the medium extending. The SVGMR elements in the sensor are apart from each other along the medium extending by a length p, defined by 1/(the number N of the SVGMR elements in the sensor) of the sum of a first magnetic region length plus a second magnetic region length, and the SVGMR elements in the sensor are connected in series so that a cycle of resistance change of the sensor is 1/N of a cycle length of magnetic patterns on the medium, and the signal output with high resolution can be obtained.

REFERENCES:
patent: 3993946 (1976-11-01), Makino
patent: 5198762 (1993-03-01), Shimoe et al.
patent: RE34443 (1993-11-01), Takahashi et al.
patent: 5680042 (1997-10-01), Griffen et al.
patent: 6300758 (2001-10-01), Griffen et al.
patent: 7253611 (2007-08-01), Ma et al.
patent: B-2812042 (1998-08-01), None
patent: B-3040750 (2000-03-01), None

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