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Browse Prior Art Database

Front Surfaced Mirror

IP.com Disclosure Number: IPCOM000076049D
Original Publication Date: 1972-Jan-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Davis, WM: AUTHOR

Abstract

A front surfaced mirror having a concave or other more complex surface may be formed by initially casting and firing a blank 3 such as shown in Fig. 1, of electrical grade ceramic and applying a reflective surface thereto. This blank is formed to the approximate dimensions of the final product. Further, ceramic material is selected because of both low cost and a coefficient of thermal expansion approaching that of glass.

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Front Surfaced Mirror

A front surfaced mirror having a concave or other more complex surface may be formed by initially casting and firing a blank 3 such as shown in Fig. 1, of electrical grade ceramic and applying a reflective surface thereto. This blank is formed to the approximate dimensions of the final product. Further, ceramic material is selected because of both low cost and a coefficient of thermal expansion approaching that of glass.

A thin layer 4 of thermosetting composite material with a low coefficient of expansion is deposited on the surface to be made reflective. An example of such a material would be glass or carbon filled epoxy. As the layer 4 approaches a permanent set; a convex, ground and polished glass tool 6 is pressed thereagainst to impart a true concave surface with a high polish. The finished surface of layer 4 may then be coated with reflective materials using chemical deposition or sputtering techniques.

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