METHOD FOR MANUFACTURING GLASS MEMBER

PROBLEM TO BE SOLVED: To provide a method for manufacturing a crystallized glass member of a low expansion material enabling adhesion of good optical surfaces without requiring the polishing with high precision such as a flatness of λ/4 or more or a high heat treatment temperature of 1,000°C or higher. SOLUTION: The method comprises the steps of precisely polishing each of the surfaces to be brought into contact, of two or more parts composed of a raw glass that has the same composition and can be crystallized, to a flatness of λ (633 nm) or less, heating these polished surfaces to a temperature in a glass transition region while they are in contact with each other to weld them, heat-treating the welded raw glass members at a higher crystal nucleation temperature to form a crystal nucleus, and crystallizing the raw glass at a further higher crystal growth temperature to stick them. COPYRIGHT: (C)2004,JPO