| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic encoder capable of securing a magnetic force sufficient for acquiring stable sensing, achieving excellence in resistance to corrosion, eliminating rust problems even when used for a long period of time or in adverse environments, and achieving satisfactory productivity and low costs. SOLUTION: The magnetic encoder 10 is provided with both a multipole magnet 14 in which magnetic poles are alternately formed in the circumference and a core bar 11 for supporting the multipole magnet 14. The multipole magnet 14 is a sintered body formed by sintering a mixture powder of a magnetic powder and a nonmagnetic metal powder. A surface treatment for resistance to corrosion is applied to the magnetic powder itself to be used for the sintered body prior to the formation of the sintered body. The surface treatment of the magnetic powder is, for example, phosphating or plating. COPYRIGHT: (C)2006,JPO&NCIPI
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