Glass manufacturing – Processes – With chemically reactive treatment of glass preform
Patent
1991-05-31
1992-07-07
Lindsay, Robert L.
Glass manufacturing
Processes
With chemically reactive treatment of glass preform
65 31, 65 324, 65111, 313534, 427 64, 427 74, C03B 2900, H01J 4018
Patent
active
051279304
ABSTRACT:
Anti-veiling-glare glass input window for an optical device. The window has throughout a shallow surface layer over its peripheral surfaces radiation absorbent free-metal-induced color centers. A method for preparation of such a window, such is particularly suited to be used as an input window for an image intensifier, involves pre-shaping the window from clear glass and forming color centers in a shallow surface layer over at least the peripheral surfaces of the window. If the clear glass contains reduceable metal oxides the color centers are formed by subjecting at least the peripheral surfaces of the clear glass to a reducing atmosphere at a temperature high enough to cause the reducing atmospheres reducing component to diffuse into a shallow surface layer of the window and to reduce the metal oxides to free metal atoms.
REFERENCES:
patent: 2498003 (1950-02-01), Peterson
patent: 2649387 (1953-08-01), Parsons et al.
patent: 3902882 (1975-09-01), Strack
patent: 3997312 (1976-12-01), Besselink
patent: 4144066 (1979-03-01), Earnsberger
patent: 4475059 (1984-10-01), Sink
B.V. Optische Industrie "De Oude Delft"
Lindsay Robert L.
Marn Louis E.
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