Patent ID: 6570376
Filing Date: 2003-05-27
Classification: G01D

Abstract:
A detector for detecting a rotational angle of a detected object, the detector comprising:an annular magnet for forming a magnetic flux parallel to a predetermined radial direction of the magnet, wherein the magnet includes a first magnetic pole portion and a second magnetic pole portion located on the outer side of the first magnetic portion, the first magnetic pole portion having a semi-circular north pole and a semi-circular south pole, and the second magnetic pole portion having a semi-circular south pole located in correspondence with the north pole of the first magnetic pole portion and a semi-circular north pole located in correspondence with the south pole of the first magnetic pole portion; a magnetic resistance sensor for generating a detection signal corresponding to the direction of the magnetic flux, wherein the detected object is connected to one of the magnet and the magnetic resistance sensor, and the magnet and the magnetic resistance sensor are rotated relatively to each other to generate the detection signal and obtain the rotational angle of the detected object, the magnetic resistance sensor being separated from an axis of rotation of one of the sensor and the magnet.