Einstückiger Teleskopspiegelrohling, Verfahren zu seiner Herstellung und Vorrichtung zur Durchführung des Verfahrens

摘要

One-piece, light-weight, transparent telescope mirror blanks consisting essentially of one integral shaped mass of transparent, low-expansion, at least partially crystallized glass ceramic having a pair of oppositely disposed face surfaces and a plurality of separate cavities between the face surfaces. One of the face surfaces of the mirror blank has a plurality of openings therein, each of the openings being in communication with a cavity. The cross-sectional area of the opening is smaller than the cross-sectional area of the cavity. Telescope mirrors can be made by coating the surface of the mirror blank with an appropriate reflecting coating. Methods of making the mirror blank and mirror are also disclosed as well as apparatus.