Optical: systems and elements – Protection from moisture or foreign particle – Sealing
Patent
1995-06-02
1996-11-19
Shafer, Ricky D.
Optical: systems and elements
Protection from moisture or foreign particle
Sealing
359846, 359848, 359883, 359900, 4283126, 65 36, 65 54, G02B 508, G02B 7182, C03B 2320, C03B 2300
Patent
active
055768849
ABSTRACT:
A light-weight base body of a reflecting mirror, such as those used in reflecting astronomical telescopes, is proposed which is made from fused silica glass or high-silica glass and is advantageous in respect of the excellent thermal and mechanical stability in dimensions to ensure high performance of the reflecting mirror. The base body is composed of a front plate, i.e. a surface plate to provide the optical surface, and a supporting body of porous foamed glass integrally bonded to the front plate. These two parts of the base body can be bonded together by sandwiching a layer of a finely divided silica powder therebetween and heating the assemblage at a temperature higher than the softening point of the silica powder so that the silica powder is softened or melted to firmly join the two parts sandwiching the powder layer. The base body can be further improved in respect of the mechanical stability by providing a rear plate backing the porous foamed body and a reinforcing hoop-like side layer surrounding the side surface of the porous foamed body, each made from fused quartz glass or high-silica glass and bonded to the porous foamed body by utilizing melting of a layer of silica powder therebetween.
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Ise Yoshiaki
Kato Toshiyuki
Kimura Hiroyuki
Miyazawa Hiroyuki
Nakamura Tatsumasa
Shafer Ricky D.
Shin-Etsu Quartz Co., Ltd.
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