OPTICAL INFORMATION RECORDING MEDIUM ADHESIVE SHEET, OPTICAL INFORMATION RECORDING MEDIUM, AND OPTICAL INFORMATION RECORDING MEDIUM REPRODUCING METHOD AND DEVICE

WIPO Patent Application WO/2011/040375

A1

An adhesive sheet (1) constitutes an optical information recording medium (D1) in which the signal of a mark having a length shorter than the optical system resolution limit of a reproducing device can be reproduced by a reproducing light irradiated during reproducing. The optical information recording medium adhesive sheet (1) has an adhesive transparent resin layer (11) provided on an information recording layer (3) of the optical information recording medium (D1), wherein the transparent resin layer (11) mainly consists of a (meth)acrylic ester copolymer not containing an acidic group and has a storage modulus of 1.5 × 105 Pa or less at 23 ˚C and a gel fraction of 68 mass% or more. The transparent resin layer (11) of the optical information recording medium adhesive sheet (1) can reproduce a mark having a length shorter than the optical system resolution limit of a reproducing device and can also be used in manufacturing of optical information recording media stable to external environment changing depending on use conditions.

TAYA NAOKI (JP)
NAKAYAMA TAKEHITO (JP)
TAJIMA HIDEHARU (JP)
HARADA YASUHIRO (JP)
YAMAMOTO MASAKI (JP)
YAMADA HIROHISA (JP)

PCT/JP2010/066718

April 07, 2011

September 27, 2010

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LINTEC CORP (JP)
SHARP KK (JP)
TAYA NAOKI (JP)
NAKAYAMA TAKEHITO (JP)
TAJIMA HIDEHARU (JP)
HARADA YASUHIRO (JP)
YAMAMOTO MASAKI (JP)
YAMADA HIROHISA (JP)

G11B7/24; G11B7/24056; G11B7/254; G11B7/256; G11B7/257

JP2002241711A	2002-08-28
JP2007226856A	2007-09-06
JP2006188630A	2006-07-20
JP2009009684A	2009-01-15
JP2008300007A	2008-12-11

HAYAKAWA, Yuzi et al. (JP)
Yuji Hayakawa (JP)

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