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WO2003038819A1 - Optical recording method and optical record medium - Google Patents

Optical recording method and optical record medium Download PDF

Info

Publication number
WO2003038819A1
WO2003038819A1 PCT/JP2002/011187 JP0211187W WO03038819A1 WO 2003038819 A1 WO2003038819 A1 WO 2003038819A1 JP 0211187 W JP0211187 W JP 0211187W WO 03038819 A1 WO03038819 A1 WO 03038819A1
Authority
WO
WIPO (PCT)
Prior art keywords
record
laser beam
recording
optical
record medium
Prior art date
Application number
PCT/JP2002/011187
Other languages
French (fr)
Japanese (ja)
Inventor
Hiroyuki Arioka
Shuji Tsukamoto
Narutoshi Fukuzawa
Takashi Horai
Hiroshi Take
Motohiro Inoue
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 JP2001331495A external-priority patent/JP2003141725A/en
Priority claimed from JP2001345223A external-priority patent/JP2003151136A/en
Application filed by Tdk Corporation filed Critical Tdk Corporation
Publication of WO2003038819A1 publication Critical patent/WO2003038819A1/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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
    • G11B7/1267—Power calibration
    • 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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording
    • 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
    • G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
    • G11B7/24085—Pits
    • G11B7/24088—Pits for storing more than two values, i.e. multi-valued recording for data or prepits

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

For multilevel recording on a recording layer of an optical record medium, an optimum recording power of a laser beam for each level of the multilevel recording is set in a short time. Stable signal characteristics are obtained with a transfer rate and a record density kept compatible rationally. A series of predetermined-length virtual record cells (40) are assumed in the recording layer (12) of an optical record medium (10) wherein information is recorded by irradiation with a laser beam. The optimum record power X (mW) of the laser beam and the record linear velocity A (m/sec) when the recording intensity of the laser beam is varied in five or more levels satisfy the expression 5 &ast; √ A < X < 10 &ast; √ A. Thus, the reflected light quantity from a virtual record cell with a record mark made by laser beam irradiation is so set as to be modulated in five or more levels.
PCT/JP2002/011187 2001-10-29 2002-10-28 Optical recording method and optical record medium WO2003038819A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2001331495A JP2003141725A (en) 2001-10-29 2001-10-29 Optical recording method and optical recording medium
JP2001-331495 2001-10-29
JP2001-345223 2001-11-09
JP2001345223A JP2003151136A (en) 2001-11-09 2001-11-09 Optical recording method and optical recording medium

Publications (1)

Publication Number Publication Date
WO2003038819A1 true WO2003038819A1 (en) 2003-05-08

Family

ID=26624174

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2002/011187 WO2003038819A1 (en) 2001-10-29 2002-10-28 Optical recording method and optical record medium

Country Status (2)

Country Link
TW (1) TW200300250A (en)
WO (1) WO2003038819A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0765378A (en) * 1993-08-30 1995-03-10 Ricoh Co Ltd Optical recording method, optical recording medium and its production
JPH08124167A (en) * 1994-10-19 1996-05-17 Hitachi Ltd Optical information recording / reproducing method and apparatus
JPH10106008A (en) * 1996-09-30 1998-04-24 Seiko Epson Corp Optical disk drive
WO2001027917A1 (en) * 1999-10-14 2001-04-19 Tdk Corporation Optical recording medium, optical recording method, optical recorded medium reproducing method
JP2001155340A (en) * 1999-11-29 2001-06-08 Ricoh Co Ltd Recording method of optical recording medium and recorder
JP2001243633A (en) * 2000-02-25 2001-09-07 Sony Corp Recording medium, recorder and reproducer
EP1174863A2 (en) * 2000-06-22 2002-01-23 TDK Corporation Optical recording medium and optical recording method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0765378A (en) * 1993-08-30 1995-03-10 Ricoh Co Ltd Optical recording method, optical recording medium and its production
JPH08124167A (en) * 1994-10-19 1996-05-17 Hitachi Ltd Optical information recording / reproducing method and apparatus
JPH10106008A (en) * 1996-09-30 1998-04-24 Seiko Epson Corp Optical disk drive
WO2001027917A1 (en) * 1999-10-14 2001-04-19 Tdk Corporation Optical recording medium, optical recording method, optical recorded medium reproducing method
JP2001155340A (en) * 1999-11-29 2001-06-08 Ricoh Co Ltd Recording method of optical recording medium and recorder
JP2001243633A (en) * 2000-02-25 2001-09-07 Sony Corp Recording medium, recorder and reproducer
EP1174863A2 (en) * 2000-06-22 2002-01-23 TDK Corporation Optical recording medium and optical recording method

Also Published As

Publication number Publication date
TW200300250A (en) 2003-05-16

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