POSITION DETECTOR EMPLOYING MAGNETORESISTIVE EFFECT ELEMENT

摘要

A circular surface 2a of a magnet 2 is magnetized to an N-pole, and a back surface 2b is magnetized to an S-pole. A detection unit 10 moves in an X-Y plane at a position apart from the surface 2a of the magnet 2. An X-direction detection element 20x and a Y-direction detection element 20y are installed in the detection unit 10. Both the X-direction detection element 20x and the Y-direction detection element 20y are magnetoresistive effect elements each having the bias magnetic field in a B-direction applied to a free magnetic layer directed perpendicular to the surface 2a of the magnet 2. Each bias magnetic field is stabilized both in the X-direction detection element 20x and the Y-direction detection element 20y such that the detection unit 10 accurately provides position detection output values in the X- and Y-directions.