DE69618890D1 - Optischer Kopf für Platten mit hoher Speicherdichte - Google Patents

Optischer Kopf für Platten mit hoher Speicherdichte

Info

Publication number
DE69618890D1
DE69618890D1 DE69618890T DE69618890T DE69618890D1 DE 69618890 D1 DE69618890 D1 DE 69618890D1 DE 69618890 T DE69618890 T DE 69618890T DE 69618890 T DE69618890 T DE 69618890T DE 69618890 D1 DE69618890 D1 DE 69618890D1
Authority
DE
Germany
Prior art keywords
high density
optical head
density disks
disks
optical
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
DE69618890T
Other languages
English (en)
Other versions
DE69618890T2 (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
Application granted granted Critical
Publication of DE69618890D1 publication Critical patent/DE69618890D1/de
Publication of DE69618890T2 publication Critical patent/DE69618890T2/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
    • G11B7/1353—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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/005—Reproducing
    • 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
    • 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
    • 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
    • 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
    • G11B7/0908—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 focusing only

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
  • Optical Recording Or Reproduction (AREA)
DE69618890T 1995-10-13 1996-10-11 Optischer Kopf für Platten mit hoher Speicherdichte Expired - Fee Related DE69618890T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7265514A JP2748906B2 (ja) 1995-10-13 1995-10-13 光学ヘッド装置

Publications (2)

Publication Number Publication Date
DE69618890D1 true DE69618890D1 (de) 2002-03-14
DE69618890T2 DE69618890T2 (de) 2002-08-22

Family

ID=17418222

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69618890T Expired - Fee Related DE69618890T2 (de) 1995-10-13 1996-10-11 Optischer Kopf für Platten mit hoher Speicherdichte

Country Status (5)

Country Link
US (1) US5748601A (de)
EP (1) EP0768651B1 (de)
JP (1) JP2748906B2 (de)
KR (1) KR100242216B1 (de)
DE (1) DE69618890T2 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7038978B2 (en) * 2000-11-21 2006-05-02 Matsushita Electric Industrial Co., Ltd. Optical information recording and reproducing apparatus for recording information bits into an optical disk in a three dimensional arrangement
CN100452199C (zh) * 2004-04-21 2009-01-14 松下电器产业株式会社 共焦光学系统开口位置检测装置、控制装置、及其检测方法、光学头装置及光信息处理装置
US20070036060A1 (en) * 2005-08-11 2007-02-15 Tdk Corporation Data recording method, data reproducing method, data recording apparatus, data reproducing apparatus, and information recording medium

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2624255B2 (ja) * 1987-06-09 1997-06-25 オリンパス光学工業株式会社 光記録再生装置
JPH0231329A (ja) * 1988-07-20 1990-02-01 Toshiba Corp 多重記録方法及び多重記録再生装置
JPH0628672A (ja) * 1992-06-12 1994-02-04 Senri Oyo Keisoku Kenkyusho:Kk 光学的データ記憶体並びにこの記録装置及び記録再生装置
JP2783070B2 (ja) * 1992-07-28 1998-08-06 日本電気株式会社 光ヘッド装置のピンホール板及びメインビーム検出器
JPH0660467A (ja) * 1992-08-07 1994-03-04 Hitachi Maxell Ltd 光磁気記録媒体用ヘッド装置
JP2655066B2 (ja) * 1993-12-28 1997-09-17 日本電気株式会社 超解像光ヘッド装置
JP2655077B2 (ja) * 1994-05-17 1997-09-17 日本電気株式会社 光ヘッド装置
JP2616722B2 (ja) * 1994-11-29 1997-06-04 日本電気株式会社 光ヘッド装置
JPH08185640A (ja) * 1994-12-28 1996-07-16 Sony Corp 多層光ディスク用光ピックアップ装置
US5526338A (en) * 1995-03-10 1996-06-11 Yeda Research & Development Co. Ltd. Method and apparatus for storage and retrieval with multilayer optical disks

Also Published As

Publication number Publication date
JP2748906B2 (ja) 1998-05-13
DE69618890T2 (de) 2002-08-22
EP0768651A1 (de) 1997-04-16
KR970023043A (ko) 1997-05-30
EP0768651B1 (de) 2002-01-30
US5748601A (en) 1998-05-05
KR100242216B1 (ko) 2000-02-01
JPH09106553A (ja) 1997-04-22

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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