Optical: systems and elements – Having significant infrared or ultraviolet property – Multilayer filter or multilayer reflector
Patent
1994-11-10
1996-10-08
Dzierzynski, Paul M.
Optical: systems and elements
Having significant infrared or ultraviolet property
Multilayer filter or multilayer reflector
359584, 359585, 359589, 4271631, 20419227, 20429821, F21V 904, G02B 110
Patent
active
055637345
ABSTRACT:
An infrared reflecting interference filter capable of transmitting a desired proportion of visible radiation while reflecting a large portion of incident solar radiation is provided. The filter comprises a transparent substrate onto which is deposited a dielectric layer, followed by metal and dielectric layers. In between each of the dielectric and metal layers is deposited a precoat layer that promotes adhesion between the dielectric and the metal. One aspect of the invention is the use of a film comprising nickel and chromium nitride for each of the metal precoat layers. These precoat layers are thin so that there is less absorption of visible light but yet maintains good adhesive properties. Another aspect of the invention is the use of silver as the metal layer. Specifically, silver is sputtered in an atmosphere containing a mixture of nitrogen and argon or other inert gas. It was found that the presence of nitrogen produces a silver layer that is more durable than silver films sputtered in an atmosphere containing essentially pure inert gas. In one embodiment, the interference filter comprises a glass substrate onto which is deposited a thin-film design consisting of five layers, namely: titanium dioxide, nickel-chromium nitride, silver, nickel-chromium nitride, and silicon nitride.
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Belkind Abraham I.
Laird Ronald E.
Wolfe Jesse D.
Draegert David A.
Dzierzynski Paul M.
Jr. John Juba
Pace Salvatore P.
The BOC Group Inc.
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