| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic encoder, capable of detection both the rotation speed and the rotation direction by a single magnetic sensor, acquiring a magnetic force capable of stable sensing by a compact constitution, and achieving high accuracy and superior in strength, in comparison to those mixed with only magnetic powder. SOLUTION: The magnetic encoder 11 has a polarized part 13 formed in a ring shape over its whole circumference. The wall thickness of the polarized part 13 is changed in the circumferential direction so as to circumferentially have normal and reverse directivities. More specifically, the wall thickness of the polarized part 13 changes circumferentially for each prescribed section R, and the wall thickness of each section changes so as to have normal and reverse directivities. Each section R has a plurality of magnetic poles magnetized alternately circumferentially by north poles and south poles. The material of the polarized part 13 is a sintered body, acquired by sintering the mixture powder of magnetic power and nonmetallic magnetic powder. COPYRIGHT: (C)2006,JPO&NCIPI
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