Patent ID: 9568729
Date: 2017-02-14
CPC Classifications: G02B,G03F

Claim:
1. An optical apparatus for deforming a reflecting surface of a mirror, comprising: a base plate; a plurality of first actuators each having a first terminal connected to a surface opposite to the reflecting surface of the mirror and a second terminal connected to the base plate, and configured to apply a force to the surface opposite to the reflecting surface by deforming so as to change a distance between the first terminal and the second terminal; a plurality of second actuators each having rigidity lower than that of the first actuators, arranged between the mirror and the base plate, and configured to apply a force to the surface opposite to the reflecting surface; a sensor configured to detect information indicating a driving status of each of the plurality of first actuators; and a control unit configured to control, based on an output of the sensor, driving of each of the plurality of first actuators and driving of each of the plurality of second actuators so that a shape of the reflecting surface is changed to a target shape.