Magnetic recording medium for encoders

Details Magnetic recording medium for encoders Magnetic recording medium for encoders

1990-03-08

1993-02-16

Thibodeau, Paul J.

Stock material or miscellaneous articles

Composite

Of inorganic material

428678, 428900, 360131, 360135, 3692751, 3692752, 3692753, G11B 566

Patent

active

051870223

ABSTRACT:
To construct a magnetic recording medium to be used for an encoder adapted for detection of an angular or linear displacement of a mobile object such as a robot arm, a substrate is at least partly covered with a Sm-Co alloy thin layer bearing magnetic information with a magnetization pitch which is at least three times as large as the crystal diameter of the magnetic particles in the alloy. A resultant high coercive force obtained with that alloy allows detection with an enlarged detective distance, and the above-mentioned proper ratio of crystal diameter with respect to the magetization pitch allows detection with low percentage of output variation, thereby enabling easy assembly of the encoder and detection with high precision.

REFERENCES:
patent: 4042341 (1977-08-01), Smeggil
patent: 4414287 (1983-11-01), Kneller et al.
patent: 4846942 (1989-07-01), Watanabe et al.

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