Diffusely reflecting optical interference filters and articles including lamps reflectors and lenses

• Main Author: PARHAM; THOMAS G
• Format: Patent
• Language: English
• Published: 02.05.1995
• Edition: 6
• Subjects: BASIC ELECTRIC ELEMENTS; BLASTING; CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS; ELECTRICITY; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; GLASS; HEATING; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; JOINING GLASS TO GLASS OR OTHER MATERIALS; LIGHTING; MECHANICAL ENGINEERING; METALLURGY; MINERAL OR SLAG WOOL; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; WEAPONS

A multilayer optical interference filter having a controlled degree of diffuse reflection over a desired visible wavelength range, includes alternating layers of at least one high refractive index material and at least one low refractive index material, wherein at least one layer of the alternating layers is a light scattering layer comprised of titania which diffusely reflects light over a desired visible wavelength range. The multilayer optical interference filter may be provided by a process including sequentially applying the alternating layers by chemical vapor deposition from respective precursors at temperatures effective to pyrolytically decompose the respective precursors, wherein the precursor of the light scattering layer comprised of titania is at least one branched alkoxide of titania. Vitreous and light transmissive articles, including electric lamps, reflectors, and/or lenses, are provided with a multilayer optical interference filter according to the invention to provide them with a controlled degree of diffuse reflection.