DE69717571D1 - Optischer Kopf - Google Patents

Optischer Kopf

Info

Publication number
DE69717571D1
DE69717571D1 DE69717571T DE69717571T DE69717571D1 DE 69717571 D1 DE69717571 D1 DE 69717571D1 DE 69717571 T DE69717571 T DE 69717571T DE 69717571 T DE69717571 T DE 69717571T DE 69717571 D1 DE69717571 D1 DE 69717571D1
Authority
DE
Germany
Prior art keywords
optical head
optical
head
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
DE69717571T
Other languages
English (en)
Other versions
DE69717571T2 (de
Inventor
Yutaka Yamanaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
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 Corp filed Critical NEC Corp
Publication of DE69717571D1 publication Critical patent/DE69717571D1/de
Application granted granted Critical
Publication of DE69717571T2 publication Critical patent/DE69717571T2/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1353—Diffractive elements, e.g. holograms or gratings
    • 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
    • G11B7/127—Lasers; Multiple laser arrays
    • G11B7/1275—Two or more lasers having different wavelengths
    • 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
    • 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
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD
    • 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
    • G11B7/1372—Lenses
    • G11B2007/13727—Compound lenses, i.e. two or more lenses co-operating to perform a function, e.g. compound objective lens including a solid immersion lens, positive and negative lenses either bonded together or with adjustable spacing
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
DE69717571T 1996-09-13 1997-09-12 Optischer Kopf Expired - Lifetime DE69717571T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8242946A JP3033693B2 (ja) 1996-09-13 1996-09-13 光ヘッド装置

Publications (2)

Publication Number Publication Date
DE69717571D1 true DE69717571D1 (de) 2003-01-16
DE69717571T2 DE69717571T2 (de) 2003-09-25

Family

ID=17096583

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69717571T Expired - Lifetime DE69717571T2 (de) 1996-09-13 1997-09-12 Optischer Kopf

Country Status (4)

Country Link
US (1) US6081488A (de)
EP (1) EP0829862B1 (de)
JP (1) JP3033693B2 (de)
DE (1) DE69717571T2 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1178474A1 (de) * 1999-05-11 2002-02-06 Matsushita Electric Industrial Co., Ltd. Optischer kopf
JP3861586B2 (ja) * 2000-11-06 2006-12-20 ソニー株式会社 光学ピックアップ装置及び記録再生装置
CN101221782B (zh) * 2002-02-26 2010-09-22 松下电器产业株式会社 光头器件以及用该光头器件的装置

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61246934A (ja) * 1985-04-23 1986-11-04 Toshiba Corp 光学ヘツド
WO1987001466A1 (en) * 1985-09-10 1987-03-12 Mitsubishi Denki Kabushiki Kaisha Optical head device
JPH056546A (ja) * 1991-06-28 1993-01-14 Casio Comput Co Ltd 情報再生装置及び情報記録再生装置
US5615200A (en) * 1992-09-10 1997-03-25 Kabushiki Kaisha Toshiba Light beam shaping device to change an anisotropic beam to an isotropic beam for reducing the size of an optical head
US5513164A (en) * 1992-09-11 1996-04-30 Kabushiki Kaisha Toshiba Optical recording and reproducing apparatus
JP2532818B2 (ja) * 1993-02-01 1996-09-11 松下電器産業株式会社 対物レンズおよび光ヘッド装置
JP3240846B2 (ja) * 1994-08-12 2001-12-25 松下電器産業株式会社 光ヘッド
JPH08203094A (ja) * 1995-01-26 1996-08-09 Matsushita Electric Ind Co Ltd 光学システム
US5754513A (en) * 1995-04-28 1998-05-19 Konica Corporation Information pick-up apparatus and optical disk apparatus
JPH08321067A (ja) * 1995-05-22 1996-12-03 Sanyo Electric Co Ltd 光ピックアップ装置
KR100239237B1 (ko) * 1995-09-12 2000-01-15 가나이 쓰도무 광디스크장치 및 그의 광헤드
JPH0991749A (ja) * 1995-09-25 1997-04-04 Victor Co Of Japan Ltd 光ピックアップ装置
US5835473A (en) * 1996-01-17 1998-11-10 Asahi Glass Company Ltd. Optical pick-up, optical data recording apparatus and objective lens for optical data recording material
JPH09265639A (ja) * 1996-01-23 1997-10-07 Sony Corp 光学ピックアップ装置

Also Published As

Publication number Publication date
US6081488A (en) 2000-06-27
JPH1091969A (ja) 1998-04-10
EP0829862B1 (de) 2002-12-04
DE69717571T2 (de) 2003-09-25
EP0829862A3 (de) 1998-07-22
EP0829862A2 (de) 1998-03-18
JP3033693B2 (ja) 2000-04-17

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