Patent ID: 7049807
Filing Date: 2006-05-23
Classification: G01D

Abstract:
1. A rotation detecting apparatus comprising: a drive gear rotatably supported by a case and capable of rotating cooperatively with an object to be detected; a driven gear rotatably supported by the case and brought in mesh with the drive gear; a magnet provided at a rotational center portion of the driven gear and formed contiguously with an N pole and an S pole; and a magnetic reluctance element opposed to a face portion of the magnet and an electronic circuit part for converting an output signal of the magnetic reluctance element into a rotational angle signal: wherein the magnet is formed with the N pole and the S pole by magnetizing the magnet after having been integrated with the driven gear, wherein the magnet is formed with the N pole and the S pole contiguously at the face portion by magnetizing a magnetic body, and wherein two end faces of the magnetic body in a rotational center axis direction of the driven gear are formed to be flat and the two end faces of the magnetic body are projected from respective faces of the driven gear in a rotational center axis direction of the driven gear or set to be flush therewith.