Patent ID: 8922862
Filing Date: 2014-12-30
Classification: B81B,G02B,H02K

Abstract:
1. A magnetic force drive device comprising: a first movable part, having a first movable plate that is formed by a non-magnetic material, and a permanent magnet that is fixed to the first movable plate and magnetized in a direction that is substantially parallel to a main surface of the first movable plate; a first frame body that is formed to surround a rim of the first movable part; a first pair of beam parts that connects between the first frame body and the first movable plate, and that supports the first movable part to be able to rotate around a first axis, the first axis being substantially parallel to the main surface of the first movable plate and being substantially perpendicular to the direction in which the permanent magnet is magnetized; and a first driving unit, having a yoke and a coil that magnetizes the yoke, wherein the yoke has a first yoke unit that has a first end part placed to face a surface of a permanent magnet, that has and a magnetic poles at two ends a second yoke unit that has a second end part placed to face one magnetic pole of the permanent magnet, and a third yoke that has a third end part placed to face an other magnetic pole of the permanent magnet, the first yoke unit, the second yoke unit, and a third yoke unit are magnetically coupled with each and form one magnetic circuit, the second end and the third ends are magnetized in the same polarity, and the first end part and the second end part are magnetized in mutually different polarities so as to drive the first movable part in a same oscillation direction.