DE69621204D1 - Optischer Kopf mit optisch veränderbarer Blende - Google Patents

Optischer Kopf mit optisch veränderbarer Blende

Info

Publication number
DE69621204D1
DE69621204D1 DE69621204T DE69621204T DE69621204D1 DE 69621204 D1 DE69621204 D1 DE 69621204D1 DE 69621204 T DE69621204 T DE 69621204T DE 69621204 T DE69621204 T DE 69621204T DE 69621204 D1 DE69621204 D1 DE 69621204D1
Authority
DE
Germany
Prior art keywords
optical head
optically changeable
changeable aperture
aperture
optically
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 - Fee Related
Application number
DE69621204T
Other languages
English (en)
Other versions
DE69621204T2 (de
Inventor
Jun-Ichi Takahashi
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 DE69621204D1 publication Critical patent/DE69621204D1/de
Application granted granted Critical
Publication of DE69621204T2 publication Critical patent/DE69621204T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G11B7/139—Numerical aperture control 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
    • 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
    • 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
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
    • 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
    • G11B7/0901—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 for track following only
    • G11B7/0903—Multi-beam tracking systems

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
DE69621204T 1995-09-29 1996-09-27 Optischer Kopf mit optisch veränderbarer Blende Expired - Fee Related DE69621204T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7252889A JP2877044B2 (ja) 1995-09-29 1995-09-29 光ヘッド装置

Publications (2)

Publication Number Publication Date
DE69621204D1 true DE69621204D1 (de) 2002-06-20
DE69621204T2 DE69621204T2 (de) 2002-12-05

Family

ID=17243580

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69621204T Expired - Fee Related DE69621204T2 (de) 1995-09-29 1996-09-27 Optischer Kopf mit optisch veränderbarer Blende

Country Status (4)

Country Link
US (1) US5761176A (de)
EP (1) EP0766236B1 (de)
JP (1) JP2877044B2 (de)
DE (1) DE69621204T2 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2995003B2 (ja) * 1995-05-08 1999-12-27 三洋電機株式会社 光学式再生装置
DE19643105A1 (de) * 1996-10-21 1998-04-23 Thomson Brandt Gmbh Gerät zum Lesen oder Beschreiben eines optischen Aufzeichnungsträgers
US6069860A (en) 1996-11-20 2000-05-30 Matsushita Electric Industrial Co., Ltd. Optical head with objective lens having different numerical apertures to minimize light aberration with respect to optical disks of different thicknesses
JP3638194B2 (ja) * 1997-03-19 2005-04-13 パイオニア株式会社 光ピックアップ装置
KR100242646B1 (ko) * 1997-03-28 2000-02-01 윤종용 홀로그램형 가변조리개를 사용하는 cd-r/dvd용 광기록/픽업헤드
JPH10312575A (ja) * 1997-05-09 1998-11-24 Pioneer Electron Corp 光ピックアップ装置
CN1245715C (zh) * 2000-12-11 2006-03-15 皇家菲利浦电子有限公司 用于读和/或写记录载体的设备

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2651148B2 (ja) * 1987-04-03 1997-09-10 シチズン時計株式会社 可変焦点光学系
JPH01273228A (ja) * 1988-04-25 1989-11-01 Sharp Corp 光ピックアップ装置
JP2616596B2 (ja) * 1990-04-20 1997-06-04 松下電器産業株式会社 光ディスク
US5235581A (en) * 1990-08-09 1993-08-10 Matsushita Electric Industrial Co., Ltd. Optical recording/reproducing apparatus for optical disks with various disk substrate thicknesses
JPH0495235A (ja) * 1990-08-10 1992-03-27 Sharp Corp 光ヘッド
JPH0777031B2 (ja) * 1991-10-16 1995-08-16 インターナショナル・ビジネス・マシーンズ・コーポレイション 収差補償装置
JPH05120720A (ja) * 1991-10-28 1993-05-18 Toshiba Corp 情報記録・再生装置
US5281797A (en) * 1991-12-26 1994-01-25 Hitachi, Ltd. Short wavelength optical disk head having a changeable aperture
JPH0620298A (ja) * 1992-06-30 1994-01-28 Sony Corp 光ヘツドの開口絞りの大きさを調整する方法とその装置
JP2816057B2 (ja) * 1992-07-29 1998-10-27 三洋電機株式会社 光学式再生装置
JP3309470B2 (ja) * 1993-03-10 2002-07-29 松下電器産業株式会社 光情報記録再生装置
US5550798A (en) * 1993-04-13 1996-08-27 Sony Corporation Enhanced optical beam splitter to increase the kerr rotation angle
JPH0845105A (ja) * 1994-08-03 1996-02-16 Matsushita Electric Ind Co Ltd 光情報記録再生装置
US6026065A (en) * 1995-03-04 2000-02-15 Lg Electronics Inc. Optical pick-up apparatus capable of reading data irrespective of disc type
JP2725632B2 (ja) * 1995-05-24 1998-03-11 日本電気株式会社 光ヘッド装置

Also Published As

Publication number Publication date
JP2877044B2 (ja) 1999-03-31
EP0766236A1 (de) 1997-04-02
US5761176A (en) 1998-06-02
EP0766236B1 (de) 2002-05-15
JPH0991748A (ja) 1997-04-04
DE69621204T2 (de) 2002-12-05

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee