Patent ID: 7907326
Filing Date: 2011-03-15
Classification: G02B,G03F

Abstract:
1. A reflecting apparatus comprising: a mirror having an axis; a holding unit configured to hold said mirror via an elastic member; a first actuator configured to position said mirror by driving said holding unit; a second actuator configured to deform said mirror, said second actuator including a magnetic member attached to said mirror and an electromagnet arranged to oppose said magnetic member, wherein said electromagnet includes a core member and a plurality of coils wound around said core member, and said electromagnet generates an attraction force between said magnetic member and said electromagnet; a base configured to support said electromagnet; a second base configured to support said first actuator, wherein said second base supports said base via an elastic member; a spring interposed between said base and said mirror and configured to apply a force between said magnetic member and said electromagnet in a direction opposite to that of the attraction force, wherein a rigidity of said spring in a direction parallel to the axis is less than that of said elastic member in the direction parallel to the axis; and a controller which controls currents supplied to said plurality of coils so as not to change a sum total of values of heat generated by said plurality of coils.