A METHOD OF CONSTRUCTING A THIN FILM MIRROR

摘要

A method of constructing a thin film mirror, which method comprises construc ting the mirror from thin plastics film on a suction chamber (8) which has: (i) top and bottom edges (AA', BB') which lie on a re quired mirror surface; (ii) ends that each have a contac t surface to the thin plastics film that lies on a required mirror surface whi ch can be developed from a plane so that the thin plasti cs film is able readily to be attached; and (iii) no abrupt discontinuities in a mirror support edge part (ABC) of the suction chamber.