| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotation detecting apparatus capable of precisely detecting rotation of a rotational axis which does not slide axially as a matter of course, and even a rotation axis which slides axially, without malfunction. SOLUTION: The rotation detecting apparatus comprises: a cylindrical body 2 made of a magnetic material which is coupled with a rotating body 1a which slides axially, so as to be rotated thereby, and has a plurality of magnetic poles 5 being disposed along its circumferential surface; and magnetic detection means 3, 4 facing the cylindrical body 2 through a prescribed spacing, wherein the magnetic field area formed by the magnetic detection means 3, 4 and the magnetic poles 5 is equivalent to or exceeds the amount of slide of the rotating body 1a in the direction of the rotational axis. COPYRIGHT: (C)2008,JPO&INPIT
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