Multi-layered antireflection film preventing reflection at two w

Details Multi-layered antireflection film preventing reflection at two w Multi-layered antireflection film preventing reflection at two w

1989-11-03

1991-03-05

Arnold, Bruce Y.

350164, 350166, G02B 528

Patent

active

049972413

ABSTRACT:
A multi-layered antireflection film preventing reflection at two wavelength regions has a substrate of a refractive index n.sub.sub and a 5-layered structured formed on the substrate and composed of a first layer group including three layers of n.sub.1 (.lambda..sub.1 /4)-n.sub.2 (.lambda..sub.2 /2)-n.sub.3 (.lambda..sub.1 /4) and a second layer group including two layers of n.sub.4 (.lambda..sub.1 /4)-n.sub.5 (.lambda..sub.1 /4). The factors are determined such that the following conditions are met:

REFERENCES:
patent: 3990784 (1976-11-01), Gelber
patent: 4082413 (1978-04-01), Austin et al.
patent: 4145113 (1979-03-01), Ranninger et al.
patent: 4856019 (1989-08-01), Miyata et al.
patent: 4907846 (1990-03-01), Tustison et al.
patent: 4927239 (1990-05-01), Melzig et al.

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