Lightweight focusing reflector for space

摘要

An adjustable focal length reflector for operation in space includes a membrane having a reflective surface. The membrane is subjected to incident radiation pressure. An assembly is located at the perimeter of the membrane to exert force on the membrane to counteract the incident radiation pressure in order to vary the focal length of the reflective surface. In a preferred embodiment the assembly includes an inflatable torus whose internal pressure is varied to vary the amount of force exerted on the membrane.