Magnetic encoder with a plurality of magnetic signal-generating

Details Magnetic encoder with a plurality of magnetic signal-generating Magnetic encoder with a plurality of magnetic signal-generating

1991-08-29

1994-06-28

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Displacement

32420724, 338 32R, G01R 3306, H01L 4308, G01B 714

Patent

active

053250567

ABSTRACT:
A magnetic encoder containing a magnetic drum having on its side surface a plurality of magnetic signal-generating means having different magnetic pole pitches, and a plurality of magnetoresistance elements each disposed opposite to each of the magnetic signal-generating means. The magneto resistance elements include a plurality of series-connected thin, ferromagnetic layer patterns having a magnetoresistance effect so that an output signal of each magnetoresistance element is in the form of a substantially sinusoidal curve. The magnetic pole pitch of one magnetic signal-generating means is 5 times or more the magnetic pole pitch of other magnetic signal-generating means, and the magnetoresistance element opposite to the magnetic signal-generating means having a larger magnetic pole pitch includes by 5 or more series-connected thin, ferromagnetic layer patterns within the range of one-fourth the larger magnetic pole pitch.

REFERENCES:
patent: 4599561 (1986-07-01), Takahashi et al.

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