WO2008142928A1 - Optical recording medium and its reproduction method - Google Patents

Optical recording medium and its reproduction method Download PDF

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Publication number
WO2008142928A1
WO2008142928A1 PCT/JP2008/057422 JP2008057422W WO2008142928A1 WO 2008142928 A1 WO2008142928 A1 WO 2008142928A1 JP 2008057422 W JP2008057422 W JP 2008057422W WO 2008142928 A1 WO2008142928 A1 WO 2008142928A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
recording medium
information
optical recording
substrate
Prior art date
Application number
PCT/JP2008/057422
Other languages
French (fr)
Japanese (ja)
Inventor
Koji Mishima
Tsutomu Aoyama
Takashi Kikukawa
Original Assignee
Tdk Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2007219462A external-priority patent/JP4803138B2/en
Application filed by Tdk Corporation filed Critical Tdk Corporation
Priority to US12/451,526 priority Critical patent/US8238214B2/en
Publication of WO2008142928A1 publication Critical patent/WO2008142928A1/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • G11B7/24035—Recording layers
    • G11B7/24038—Multiple laminated recording layers

Abstract

It is possible to provide an optical recording medium which has three or more information layers and can increase the setting density in the thickness direction of the information layers as compared to the conventional technique while suppressing crosstalk upon reproduction. A method for reproducing the recording medium is also provided. An optical recording medium (10) has a three-layer structure formed by a substrate (12), a first information layer (14), a first spacer layer (16), a second information layer (18), a second spacer layer (20), a third information layer (22), and a cover layer (24) which is thinner than the substrate (12). These layers are successively layered in this order on the substrate (12). The first information layer (14) has a reflection factor R1, the second information layer (18) has a reflection factor R2, and a third information layer (22) has a reflection factor R3 which satisfy Expression (1) as follows. (R2 x R3 x R2)/R1 ≤ 0.0032 ... Expression (1) The thickness of the first spacer layer (16) is identical to the thickness of the second spacer layer (20).
PCT/JP2008/057422 2007-05-18 2008-04-16 Optical recording medium and its reproduction method WO2008142928A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/451,526 US8238214B2 (en) 2007-05-18 2008-04-16 Optical recording medium and method for reproducing the same

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2007133279 2007-05-18
JP2007-133279 2007-05-18
JP2007-219462 2007-08-27
JP2007219462A JP4803138B2 (en) 2007-05-18 2007-08-27 Optical recording medium and reproducing method thereof

Publications (1)

Publication Number Publication Date
WO2008142928A1 true WO2008142928A1 (en) 2008-11-27

Family

ID=40031644

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/057422 WO2008142928A1 (en) 2007-05-18 2008-04-16 Optical recording medium and its reproduction method

Country Status (1)

Country Link
WO (1) WO2008142928A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110194390A1 (en) * 2010-02-09 2011-08-11 Chia-Tao Hsu Control method for adjusting laser power of laser beam irradiating multi-layer optical storage medium and related controller thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004213720A (en) * 2002-12-27 2004-07-29 Tdk Corp Optical recording medium
JP2005285222A (en) * 2004-03-30 2005-10-13 Tdk Corp Multilayer information recording medium manufacturing method and multilayer information recording medium manufacturing equipment
JP2006073053A (en) * 2004-08-31 2006-03-16 Tdk Corp Optical recording medium
JP2007080303A (en) * 2005-09-09 2007-03-29 Toshiba Corp Information recording medium and optical disk apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004213720A (en) * 2002-12-27 2004-07-29 Tdk Corp Optical recording medium
JP2005285222A (en) * 2004-03-30 2005-10-13 Tdk Corp Multilayer information recording medium manufacturing method and multilayer information recording medium manufacturing equipment
JP2006073053A (en) * 2004-08-31 2006-03-16 Tdk Corp Optical recording medium
JP2007080303A (en) * 2005-09-09 2007-03-29 Toshiba Corp Information recording medium and optical disk apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110194390A1 (en) * 2010-02-09 2011-08-11 Chia-Tao Hsu Control method for adjusting laser power of laser beam irradiating multi-layer optical storage medium and related controller thereof

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