A circular top surface of a magnet is magnetized to the N-pole, and a back surface thereof is magnetized to the S-pole. A detector moves within the X-Y plane at positions located away from the top surface of the magnet. A pair of X-direction detecting elements and a pair of the Y-direction detecting...http://www.google.es/patents/US8102172?utm_source=gb-gplus-sharePatente US8102172 - Position detector including magnetoresistive elements
Position detector including magnetoresistive elements
