Optical device having low visual light transmission and low visu

Optical: systems and elements – Light interference – Produced by coating or lamina

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359586, 428622, 428632, G02B 110, G02B 528, B21D 3900, C03C 2704

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active

RE0363081

ABSTRACT:
A solar control film having low visible light transmittance and low visible light reflectance is comprised of two or more transparent substrates each bearing a thin, transparent, discontinuous, incoherent film of metal having low visible light reflectance and a degree of visible light blocking capacity, the substrates being so assembled and laminated into a composite that the visible light blocking capacities of the metal films are effectively combined to provide a composite having low visible light transmittance. Performance characteristics are enhanced by providing on one or more of the substrates a transparent coating of high refractive index underlying the metal film. The material of high refractive index is preferably a synthetic high oxygen content oxide of bismuth, which facilitates efficient and economical production of the solar control film.

REFERENCES:
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patent: 4634637 (1987-01-01), Oliver et al.
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patent: 5306547 (1994-04-01), Hood et al.
Floyd E. Woodward et al., PCT International Publication No. WO 94/04356, Mar. 1994.
3M Scotchtint.TM. Sun Control Window Film Re2onearl, Minnesota Mining & Manufacturing Co., St. Paul, MN (1 sheet).

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