Antireflection film for plastic optical element

Stock material or miscellaneous articles – Composite – Of silicon containing

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428335, 428451, 428697, 428699, 428701, 428702, 359359, 359582, 359586, 359588, B32B 904

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active

057259593

ABSTRACT:
An antireflection film is procided on a plastic optical element as follows. An undercoat composed principally of unsaturated silicon exide SiO.sub.x (2>x>1) with a thickness within a range of 200 to 300 nm is formed on the optical element. A multi-layered film of a repeating structure is formed on the undercoat. The multi-layerd film has antireflective characteristics. The undercoat has a refractive index within a range of 1.49 to 1.59. The multi-layered film is composed of alternate lamination of a layer of a material which has a high refractive index and which is composed principally of TiO.sub.2, ZrO.sub.2 or a mixture thereof, and a layer of a material which has a low refractive index and which is composed principally of SiO.sub.x (2.gtoreq.x.gtoreq.1).

REFERENCES:
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patent: 4784467 (1988-11-01), Akatsuka
patent: 4805989 (1989-02-01), Nakajima
patent: 4957358 (1990-09-01), Terada et al.
patent: 5105310 (1992-04-01), Dickey
patent: 5181141 (1993-01-01), Sato
patent: 5270858 (1993-12-01), Dickey
patent: 5362552 (1994-11-01), Austin

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