Coating processes – Optical element produced – Transparent base
Patent
1991-07-15
1993-02-02
Lusignan, Michael
Coating processes
Optical element produced
Transparent base
427166, 4272481, C23C 1600, C23C 1622
Patent
active
051836890
ABSTRACT:
The surface of a zinc selenide substrate is ground to curve in the opposite direction from that which occurs due to the bimetallic effect when zinc sulfide is deposited on a flat substrate by the chemical vapor deposition process. The bowing of the interface that occurs upon cooling of the hot laminate when the surface of the substrate is flat before deposition is compensated for by the pre-figured bowing. A distortion free window for the transmission of infra-red radiation is provided by this invention.
REFERENCES:
patent: 4560576 (1985-12-01), Lewis et al.
patent: 4944900 (1990-07-01), Willingham et al.
patent: 4956000 (1990-09-01), Reeber et al.
patent: 4978577 (1990-12-01), Purohit et al.
patent: 5037709 (1991-08-01), Tomomura et al.
patent: 5067781 (1991-11-01), Montanari et al.
Burns Lee E.
MacDonald James C.
Taylor Raymond L.
Chen Bret
CVD Inc.
Didrick Robert M.
Lusignan Michael
White G. K.
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