Stock material or miscellaneous articles – Composite – Of silicon containing
Patent
1996-11-22
1998-03-10
Speer, Timothy
Stock material or miscellaneous articles
Composite
Of silicon containing
428335, 428451, 428697, 428699, 428701, 428702, 359359, 359582, 359586, 359588, B32B 904
Patent
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).
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Kameyama Makoto
Sakamoto Jun-ichi
Terada Junji
Canon Kabushiki Kaisha
Speer Timothy
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