Glass manufacturing – Processes – Fusion bonding of glass to a formed part
Patent
1991-10-30
1994-05-31
Arnold, Bruce Y.
Glass manufacturing
Processes
Fusion bonding of glass to a formed part
65 54, 65 55, 359846, 359848, C03B 2320, C03B 2300, G02B 508, G02B 7192
Patent
active
053165640
ABSTRACT:
The invention provides a method of preparing a light-weight base body of a reflecting mirror such as a mirror in a reflecting astronomical telescope, which is very stable not only thermally but also mechanically and is highly resistant against adverse environmental influences. The mirror base is composed of a porous foamed disc body of fused quartz glass or high-silica glass sandwiched by two plates of fused quartz glass or high-silica glass, of which one is made from transparent glass and serves to provide an optical surface having flatness or a specified curvature, and the side surface of the porous foamed disc body is protected against environmental influences by providing an air-tight sealing layer formed from a silicone rubber-based sealing agent or a thin sheet of fused quartz glass or high-silica glass.
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Ise Yoshiaki
Nakamura Tatsumasa
Okamoto Yoshiaki
Arnold Bruce Y.
Jr. John Juba
Okamoto Optics Work, Inc.
Shin-Etsu Quartz Co., Ltd.
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