Patent ID: 9306440
Filing Date: 2016-04-05
CPC Classification: F16F,H02K

Claim Text:
1. An electromagnetic actuator comprising: a stator; a mover attached displaceable in relation to the stator; a plurality of plate springs elastically coupling the stator and the mover; and a coil member attached to one of the stator and the mover, the coil member being energized to generate a magnetic field that exerts a force on the mover to drive the mover in relation to the stator, wherein each of the plate springs includes an outer circumference attachment part and a center attachment part respectively attached to one and another of the stator and the mover, a plurality of spiral-shaped connection arm parts are provided at equal intervals in a circumferential direction between the outer circumference attachment part and the center attachment part in a radial direction so as to extend in the radial direction while being inclined in the circumferential direction, the plate springs overlap in a thickness direction and all of the plate springs are mutually formed with a same material and in a same shape, the plurality of plate springs are disposed on one side of the mover in a driving direction of the mover, an outer circumference spacer is interposed between overlapping surfaces of the outer circumference attachment parts of the plate springs, a center spacer is interposed between overlapping surfaces of the center attachment parts of the plate springs, and the connection arm parts of the plate springs are separated from each other in the thickness direction.