Patent ID: 9385579
Filing Date: 2016-07-05
CPC Classification: H02K,H02N

Claim Text:
1. An inertial drive actuator comprising: a displacement unit which causes a minute displacement in a first direction and in a second direction, the second direction being opposite to the first direction; a vibration substrate which undergoes a reciprocating movement due to the minute displacement caused by the displacement unit; a movable body disposed on a surface of the vibration substrate; a first magnetic field generator disposed on a side of the vibration substrate opposite to the surface of the vibration substrate on which the movable body is disposed, the first magnetic field generator generating a magnetic field so that, a magnetic attractive force or a magnetic repulsive force acts in a direction of the vibration substrate; a first yoke which constitutes at least a part of the movable body, and which induces a magnetic flux generated by the first magnetic field generator; and a second yoke disposed on a side of the vibration substrate, opposite to a direction facing the movable body, wherein the second yoke is formed around the first magnetic field generator and is configured to guide magnetic flux generated by the first magnetic field generator such that the magnetic flux generated by the first magnetic field generator concentrates on the side opposite to the surface of the vibration substrate with respect to both an S-pole and an N-pole, and to induce the magnetic flux towards the first yoke, and the second yoke controls a frictional force acting between the movable body and the vibration substrate by controlling a magnetic field generated by the first electric field generator such that, both the N-pole and the S-pole of the magnetic flux generated by the first magnetic field generator are concentrated on a surface toward a fixed body, and drives the movable body.