OPTICAL THIN FILM, MULTILAYER OPTICAL THIN FILM, OPTICAL ELEMENT, METHOD FOR PRODUCING OPTICAL ELEMENT, AND COATING LIQUID FOR FORMING OPTICAL THIN FILM

WIPO Patent Application WO/2012/053427

A1

[Problem] To provide a novel low-refractive-index optical thin film which can be formed by a wet film-forming method that does not require heat baking. [Solution] An optical thin film formed on the optical surface of an optical substrate contains crystalline MgF2 particles and a hardened material of a first active energy ray-curable resin composition that is present between the crystalline MgF2 particles, and has a lower refractive index than the refractive index of the optical substrate. Also provided is a multilayer optical thin film, which has a resin layer containing the optical thin film and a hardened material of a second energy ray-curable resin composition that is formed between the optical thin film and the optical surface, wherein the optical thin film is the outermost layer. Further provided is an optical element containing the optical substrate having an optical surface, and the optical thin film formed on the optical surface.

YONEYAMA KENJI (JP)
OSAKA MASAHIRO (JP)
ISHIZAWA HITOSHI (JP)

PCT/JP2011/073604

April 26, 2012

October 14, 2011

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NIKON CORP (JP)
YONEYAMA KENJI (JP)
OSAKA MASAHIRO (JP)
ISHIZAWA HITOSHI (JP)

G02B1/11

WO2006030848A1

2006-03-23

JP2004300172A	2004-10-28
JP2009543156A	2009-12-03
JP2008266505A	2008-11-06
JP2007086764A	2007-04-05
JPH036265A	1991-01-11
JPH01210433A	1989-08-24
JPH07168006A	1995-07-04
JPH0527102A	1993-02-05
JP2010169940A	2010-08-05

KAWAKITA, KIJURO (JP)
Kijuro Kawakita (JP)

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