Method of fabricating heat mirror for incandescent lamp...

H - Electricity – 01 – K

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316/19, 313/83

H01K 3/00 (2006.01) C03C 17/36 (2006.01)

Patent

CA 1148208

47,951I ABSTRACT OF THE DISCLOSURE Energy conserving incandescent lamp wherein the envelope has provided on the interior surface thereof a very efficient and economically applied heat mirror which is highly transmissive for visible radiations and highly reflective for infrared radiations, thereby to enhance the conversion of electric energy to visible energy. The heat-mirror coating comprises a two layer Ag/TiO2 or a three layer TiO2/Ag/TiO2 coating of predetermined thick- ness. The three layer coating is formed by first applying to the envelope interior surface a thin layer of clear aliphatic alcohol solution having contained therein par- tially hydrolyzed metallic alkoxide which substantially comprises titanium alkoxide, and which solution contains at most only a limited amount of selected mineral acid. The applied clear solution layer is heat treated to con- vert same to a thin continuous layer substantially com- prising titania. A thin silver layer is applied over the first applied titania coating, preferably by vacuum metal- lizing, and a second thin layer of solution containing the partially hydrolyzed metallic alkoxide which substantially comprises titanium alkoxide is applied over the silver layer. Thereafter the applied second layer is heat treated to convert same to titania, with the heat treating temperatures and atmospheres controlled so as not to affect the applied silver layer. The two layer coating is applied by omitting the first TiO2 coating step.

362051

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