Antireflection film and optical element having the same

Optical: systems and elements – Having significant infrared or ultraviolet property – Multilayer filter or multilayer reflector

Reexamination Certificate

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C359S586000, C359S588000

Reexamination Certificate

active

06947209

ABSTRACT:
An antireflection film includes alternately deposited high-refractive-index layers and low-refractive-index layers. The refractive indexes and extinction coefficients of the layers are such that the antireflection film exhibits sufficient antireflection characteristics even if the geometrical thickness thereof is small. An optical element having the antireflection film on a substrate exhibits high transmittance and has excellent optical characteristics.

REFERENCES:
patent: 5661596 (1997-08-01), Biro et al.
patent: 5885712 (1999-03-01), Otani et al.
patent: 5993898 (1999-11-01), Nagatsuka
patent: 6261696 (2001-07-01), Biro et al.
patent: 6396626 (2002-05-01), Otani et al.
patent: 6472087 (2002-10-01), Otani et al.
patent: 6590702 (2003-07-01), Shirai
patent: 7-244205 (1995-09-01), None
patent: 7-244217 (1995-09-01), None
patent: 9-258006 (1997-10-01), None
patent: 2000-206304 (2000-07-01), None

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