Optical: systems and elements – Having significant infrared or ultraviolet property – Multilayer filter or multilayer reflector
Patent
1990-07-27
1991-10-29
Arnold, Bruce Y.
Optical: systems and elements
Having significant infrared or ultraviolet property
Multilayer filter or multilayer reflector
359589, G02B 522, G02B 528
Patent
active
RE0337293
ABSTRACT:
A short-wave-pass optical filter, that includes a partially absorbing or transparent substrate coated by a set of layers having specified quarter-wave optical thickness, and is designed to reflect visible radiation of a selected color while transmitting visible radiation and maintaining a neutral color balance. The coating includes layers having a high refractive index alternating with layers having a low refractive index. The refractive indices and layer thicknesses are selected so that the filter's reflectance spectrum exhibits a ripple over a first segment of the visible spectrum but no significant ripple over a second segment of the visible. The filters may be used as sunglass lenses that have a selected color (such as blue, orange, or violet) when viewed by one other than the sunglass wearer, while permitting the wearer to perceive transmitted light with a correct color balance. The design of the inventive filter is preferably optimized to have the desired optical properties while being conveniently and repeatably manufacturable.
REFERENCES:
patent: 3279317 (1966-10-01), Ploke
patent: 3990784 (1976-11-01), Gelber
patent: 4045125 (1977-08-01), Farges
patent: 4047805 (1977-09-01), Sekimura
patent: 4229066 (1980-10-01), Rancourt et al.
patent: 4536063 (1985-08-01), Southwell
patent: 4793669 (1988-12-01), Perilloux
Arnold Bruce Y.
Coherent Inc.
Ryan J. P.
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