KR970023043A - 고밀도 디스크용 광학 헤드 - Google Patents

고밀도 디스크용 광학 헤드 Download PDF

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Publication number
KR970023043A
KR970023043A KR1019960046114A KR19960046114A KR970023043A KR 970023043 A KR970023043 A KR 970023043A KR 1019960046114 A KR1019960046114 A KR 1019960046114A KR 19960046114 A KR19960046114 A KR 19960046114A KR 970023043 A KR970023043 A KR 970023043A
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KR
South Korea
Prior art keywords
optical head
optical
detection means
generate
high density
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KR1019960046114A
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English (en)
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KR100242216B1 (ko
Inventor
준이치 다카하시
Original Assignee
가네꼬 히사시
닛폰 덴키 가부시키가이샤
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Publication of KR970023043A publication Critical patent/KR970023043A/ko
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Publication of KR100242216B1 publication Critical patent/KR100242216B1/ko

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    • 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

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

Abstract

광학 디스크의 피트 깊이로 기록된 다중값 데이터를 갖는 고밀도 광학 디스크 사용에 제공되는 광학 헤드이다.
본 광학 헤드는 제로차 및 1쌍의 1차 회절빔을 광검출기에 제공하기 위한 광학 시스템의 촛점면에 3개의 핀홀을 갖는 핀홀 부재를 포함하며, 따라서 피트 깊이를 검출하기 위한 해상도를 개선시킨다. 광학 헤드는 빔 스폿의 직경을 감소시키지 않고 촛점 깊이 방향으로 해상도를 개선시키다.

Description

고밀도 디스크용 광학 헤드
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제2도는 본 발명의 실시예에 따른 광학 헤드의 블록도.
제3A도 및 제3B도는 제2도의 광학 헤드와 종래의 광학 헤드의 촛점 근처에서 3개의 치수적인 광밀도의 3개의 치수적인 푸리에 변환(Fourier transform)사이의 2개의 단면도.
제4A도 및 제4B도는 피트로 엔코드된 2개의 데이터가 형성된 종래의 디스크 파일과, 피드로 엔코드된 4진 데이터가 형성된 디스크 파일의 단면도.
제4C도 및 제4B도에 도시된 광학 디스크로부터 검출된 재생 신호의 다이아그램.

Claims (3)

  1. 광빔을 발사하는 광원과, 상기 광학 헤드에 관련되어 배치된 최소한 1쌍의 1차 회절빔을 발생하는 광빔을 회절하기 위한 회절 격자와, 광 디스크 파일로부터 1상의 반사빔을 발생하기 위해 광 디스크 파일위에 1차 회절된 빔을 집속하기 위한 제1광학 시스템과, 1쌍의 접속된 빔을 발생하기 위해 각 초점에서 반사된 빔을 집속하기 위한 제2광학 시스템과, 상기 각각의 집속된 빔에 대응하는 각 초점에서 핀홀을 갖는 핀홀부재와, 검출 신호를 발생하기 위하여 각 핀홀을 통과하는 1쌍의 접속된 빔중 하나를 각각 수신하는 하나 이상의 검출 수단을 갖는 광검출기 및 검출 신호에 근거한 광학 헤드를 트래킹하기 위한 제어 수단으로 구성되는 것을 특징으로 하는 고밀도용 광학 헤드.
  2. 제1항에 있어서, 더 나아가 트래킹 에러 신호를 발생하고 상기 제어 수단에 트래킹 에러 신호를 공급하기 위해 검출 신호를 프로세싱하는 트래킹 에러검출수단을 갖는 것을 특징으로 하는 고밀도용 광학 헤드.
  3. 제2항에 있어서, 더 나아가 상기 회절격자에서 제로차 회절빔이 통과하고, 상기 핀홀부재 및 광검출기는 다른 핀홀 및 다른 검출 신호를 발생하기 위해 광 디스크 파일로부터 반사되고, 사익 제1 및 제2광학 시스템을 통과한 제로차 회절빔을 위한 또다른 검출 수단을 갖고, 또다른 검출 신호를 상기 포커싱 에러검출수단에 공급하는 포커싱 에러검출수단을 갖는 것을 특징으로 하는 고밀도용 광학 헤드.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019960046114A 1995-10-13 1996-10-12 고밀도 디스크용 광학 헤드 KR100242216B1 (ko)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP95-265514 1995-10-13
JP7265514A JP2748906B2 (ja) 1995-10-13 1995-10-13 光学ヘッド装置

Publications (2)

Publication Number Publication Date
KR970023043A true KR970023043A (ko) 1997-05-30
KR100242216B1 KR100242216B1 (ko) 2000-02-01

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

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100448323B1 (ko) * 2000-11-21 2004-09-10 마츠시타 덴끼 산교 가부시키가이샤 광학정보 기록재생장치
JP4850703B2 (ja) * 2004-04-21 2012-01-11 パナソニック株式会社 共焦点光学系開口位置制御装置、光ヘッド装置および光情報処理装置
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

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Publication number Publication date
US5748601A (en) 1998-05-05
JP2748906B2 (ja) 1998-05-13
EP0768651A1 (en) 1997-04-16
DE69618890D1 (de) 2002-03-14
KR100242216B1 (ko) 2000-02-01
EP0768651B1 (en) 2002-01-30
DE69618890T2 (de) 2002-08-22
JPH09106553A (ja) 1997-04-22

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