Patent ID: 6157186
Filing Date: 2000-12-05
Classification: G01D,G01P

Abstract:
A rotation detecting apparatus comprising:a magnet;a magnet detection element located in the vicinity of said magnet, said magnetic detection element detecting change in a magnetic field of said magnet due to rotation of an adjacently-positioned rotation member;a signal processing circuit processing a signal from the magnetic detection element; anda casing made of resin material comprising a casing body and a sealing member, the casing body having a recess portion which receives said magnet, said magnet detection element and said signal processing circuit, the sealing member filling the recess portion so as to sealingly embed said magnet, said magnetic detection element and said signal processing circuit in the recess portion,wherein a clearance groove for absorbing thermal deformation of the sealing member is formed at a peripheral wall portion of the recess portion in the casing body.