OPTICAL INFORMATION RECORDING MEDIUM

Title:

OPTICAL INFORMATION RECORDING MEDIUM

Document Type and Number:

WIPO Patent Application WO/2009/028704

Kind Code:

A1

Abstract:

The present invention provides an optical information recording medium that can stably carry out the recording or reproducing of information with a simple structure. Since the optical information recording medium of this invention contains a photo-polymerization initiator with the evaporation temperature in the range of 140ºC-400 ºC, a recording light beam (L2c) is concentrated to heata portion in the vicinity of the focus (Fb) of the recording light beam (L2c). The heat volatilizes the photo-polymerization initiator, so that it can form bubbles. The bubbles are left as cavities in the recording layer (101) after the irradiation of the recording light beam (L2c) is completed and the area in the vicinity of the focus (Fb) is cooled down. When a reading-out beam (L2d) is irradiated to the bubbles, the difference between the bubble internal refractive index and the recording layer (101) refractive index as the bubble external one reflects the reading-out beam (L2d) and makes it possible to generate a returning beam (L3).

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Inventors:

UCHIYAMA HIROSHI (JP)
KUDO TAKAO (JP)
HAYASHIBE KAZUYA (JP)
SUZUKI YUSUKE (JP)
YAMATSU HISAYUKI (JP)
TANABE NORIHIRO (JP)

Application Number:

PCT/JP2008/065628

Publication Date:

March 05, 2009

Filing Date:

August 26, 2008

Export Citation:

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Assignee:

SONY CORP (JP)
UCHIYAMA HIROSHI (JP)
KUDO TAKAO (JP)
HAYASHIBE KAZUYA (JP)
SUZUKI YUSUKE (JP)
YAMATSU HISAYUKI (JP)
TANABE NORIHIRO (JP)

International Classes:

G11B7/244; B41M5/26; G11B7/004; G11B7/24035; G11B7/24038

Foreign References:

JP2002197719A	2002-07-12
JP2007026629A	2007-02-01
JPH10222871A	1998-08-21
JP2006182029A	2006-07-13
JP2006078834A	2006-03-23
JP2006190347A	2006-07-20

Other References: