WO2008133204A1 - 光ディスク装置、及び、複屈折補正方法 - Google Patents

光ディスク装置、及び、複屈折補正方法 Download PDF

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Publication number
WO2008133204A1
WO2008133204A1 PCT/JP2008/057601 JP2008057601W WO2008133204A1 WO 2008133204 A1 WO2008133204 A1 WO 2008133204A1 JP 2008057601 W JP2008057601 W JP 2008057601W WO 2008133204 A1 WO2008133204 A1 WO 2008133204A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical disc
light
birefringence
birefringence correction
phase difference
Prior art date
Application number
PCT/JP2008/057601
Other languages
English (en)
French (fr)
Inventor
Mizuho Tomiyama
Masashi Kubota
Takeharu Shibatoko
Yutaka Yamanaka
Original Assignee
Nec 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
Application filed by Nec Corporation filed Critical Nec Corporation
Publication of WO2008133204A1 publication Critical patent/WO2008133204A1/ja

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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
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
    • G11B7/13925—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means
    • G11B7/13927—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means during transducing, e.g. to correct for variation of the spherical aberration due to disc tilt or irregularities in the cover layer thickness
    • 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
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
    • G11B7/1369—Active plates, e.g. liquid crystal panels or electrostrictive elements
    • 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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0948—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for detection and avoidance or compensation of imperfections on the carrier, e.g. dust, scratches, dropouts

Abstract

　光ディスク装置は、光ヘッド（１００）と、複屈折部材（１１３）と、制御装置（１１６）とを有する。光ヘッドは、光源から出射した光を保護層を有する光ディスク（１０７）に照射し、光ディスクからの反射光を光検出器（１０９）により検出する。複屈折補正部材は、光ディスクへの入射光、及び、光ディスクからの反射光に対し、所定方向の偏光成分と所定方向と直交する方向の偏光成分との間に位相差を与える。制御装置は、保護層の複屈折が入射光及び反射光に与える影響を補正する第１の位相差を光ディスクの回転数情報に基づいて決定し、複屈折補正部材が第１の位相差を与えるように制御する。
PCT/JP2008/057601 2007-04-20 2008-04-18 光ディスク装置、及び、複屈折補正方法 WO2008133204A1 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007-111134 2007-04-20
JP2007111134 2007-04-20

Publications (1)

Publication Number Publication Date
WO2008133204A1 true WO2008133204A1 (ja) 2008-11-06

Family

ID=39925658

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/057601 WO2008133204A1 (ja) 2007-04-20 2008-04-18 光ディスク装置、及び、複屈折補正方法

Country Status (1)

Country Link
WO (1) WO2008133204A1 (ja)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63214921A (ja) * 1987-03-04 1988-09-07 Daicel Chem Ind Ltd 光デイスクの記録・再生方法
JPS6413431A (en) * 1987-07-08 1989-01-18 Seiko Epson Corp Measuring instrument for birefringence of optical disk substrate
JPH06243523A (ja) * 1993-02-16 1994-09-02 Canon Inc 光磁気ディスクおよび光磁気ディスクシステム
JP2000268398A (ja) * 1999-03-18 2000-09-29 Pioneer Electronic Corp 光ピックアップ、情報記録装置及び情報再生装置
JP2000331382A (ja) * 1999-05-14 2000-11-30 Victor Co Of Japan Ltd 光ディスク及び光ピックアップ並びに光ディスク装置
JP2001176114A (ja) * 1999-12-20 2001-06-29 Pioneer Electronic Corp ピックアップ装置及び情報記録再生装置
JP2004220633A (ja) * 2002-11-19 2004-08-05 Mitsumi Electric Co Ltd 光ディスクドライブ
JP2006196156A (ja) * 2005-01-10 2006-07-27 Samsung Electronics Co Ltd 光情報記録媒体の複屈折補正用の液晶素子及びそれを備える光ピックアップ及び光記録及び／または再生機器

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63214921A (ja) * 1987-03-04 1988-09-07 Daicel Chem Ind Ltd 光デイスクの記録・再生方法
JPS6413431A (en) * 1987-07-08 1989-01-18 Seiko Epson Corp Measuring instrument for birefringence of optical disk substrate
JPH06243523A (ja) * 1993-02-16 1994-09-02 Canon Inc 光磁気ディスクおよび光磁気ディスクシステム
JP2000268398A (ja) * 1999-03-18 2000-09-29 Pioneer Electronic Corp 光ピックアップ、情報記録装置及び情報再生装置
JP2000331382A (ja) * 1999-05-14 2000-11-30 Victor Co Of Japan Ltd 光ディスク及び光ピックアップ並びに光ディスク装置
JP2001176114A (ja) * 1999-12-20 2001-06-29 Pioneer Electronic Corp ピックアップ装置及び情報記録再生装置
JP2004220633A (ja) * 2002-11-19 2004-08-05 Mitsumi Electric Co Ltd 光ディスクドライブ
JP2006196156A (ja) * 2005-01-10 2006-07-27 Samsung Electronics Co Ltd 光情報記録媒体の複屈折補正用の液晶素子及びそれを備える光ピックアップ及び光記録及び／または再生機器

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