An assembly that can provide corrections of distortions of a mirror. The assembly uses the method of active optics to apply forces to the mirror to introduce deformations that cancel out the distortions. An important feature of the assembly is the employment of a force actuator which comprises a closed...http://www.google.com.tw/patents/US4875764?utm_source=gb-gplus-share專利 US4875764 - Assembly for correction of distortions of a mirror
