Abstract: The invention provides 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.
Type:
Grant
Filed:
April 7, 1995
Date of Patent:
October 8, 1996
Assignees:
Shin-Etsu Quartz Co, Ltd., Okamoto Optics Work, Inc.
Inventors:
Tatsumasa Nakamura, Yoshiaki Ise, Yoshiaki Okamoto
Abstract: The invention provides 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.
Type:
Grant
Filed:
February 17, 1994
Date of Patent:
October 24, 1995
Assignees:
Shin-Etsu Quartz Co., Ltd., Okamoto Optics Work, Inc.
Inventors:
Tatsumasa Nakamura, Yoshiaki Ise, Yoshiaki Okamoto
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.
Type:
Grant
Filed:
October 30, 1991
Date of Patent:
May 31, 1994
Assignees:
Shin-Etsu Quartz Co., Ltd., Okamoto Optics Work, Inc.
Inventors:
Tatsumasa Nakamura, Yoshiaki Ise, Yoshiaki Okamoto
© 2024 Justia
