KR970017263A - 대물 렌즈에 입사될 광의 빔 직경을 증가시키기 위한 렌즈계를 갖는 광 헤드 장치 - Google Patents

대물 렌즈에 입사될 광의 빔 직경을 증가시키기 위한 렌즈계를 갖는 광 헤드 장치 Download PDF

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Publication number
KR970017263A
KR970017263A KR1019960041877A KR19960041877A KR970017263A KR 970017263 A KR970017263 A KR 970017263A KR 1019960041877 A KR1019960041877 A KR 1019960041877A KR 19960041877 A KR19960041877 A KR 19960041877A KR 970017263 A KR970017263 A KR 970017263A
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KR
South Korea
Prior art keywords
lens
beam diameter
light
objective lens
optical head
Prior art date
Application number
KR1019960041877A
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English (en)
Inventor
쥰이찌 다까하시
Original Assignee
가네꼬 히사시
닛본덴기 가부시끼가이샤
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 가네꼬 히사시, 닛본덴기 가부시끼가이샤 filed Critical 가네꼬 히사시
Publication of KR970017263A publication Critical patent/KR970017263A/ko

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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
    • G11B7/139—Numerical aperture control means
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/001—Axicons, waxicons, reflaxicons
    • 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
    • G11B7/1378—Separate aberration correction lenses; Cylindrical lenses to generate astigmatism; Beam expanders
    • 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
    • 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
    • G11B7/094—Methods and circuits for servo offset compensation

Landscapes

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

Abstract

광 헤드 장치는 레이저 원(52)로부터 방출되고 빔 스프릿터(64)로부터 반사된 광이 대물 렌즈(56)에 의해 광 디스크(58) 상에 수렴되고 반사된 광이 광 겅출기(54)로 안내되는 광학계를 갖는다. 광학계는 상기 빔 스프릿터를 통해 상기 레이저 원으로부터 상기 대물 렌즈상에 입사된 광속의 빔 직경을 화대하는 빔 직경 확대 렌즈(14)를 포함한다. 빔 직경 확대 렌즈는 원추형 렌즈로 구성된다. 억세스가 렌즈 작동기와 같은 수단을 필요로 하지 않고서 대물 렌즈 만에 의해 이루어질 수 있는 범위를 확대할 수 있다.
대표도 : 제6도

Description

대물 렌즈에 입사될 광의 빔 직경을 증가시키기 위한 렌즈계를 갖는 광 헤드 장치
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제6도는 본 발명에 따른 실시예의 광 헤드 장치의 전체적 구성을 도시한 도면.

Claims (3)

  1. 레이저 원(52)로부터 방출되고 빔 스프릿터(64)로부터 반사된 광이 대물 렌즈(56)에 의해 광 디스크(58)상에 수렴되고 반사된 광이 광 검출기(54)로 안내되는 광학계를 갖는 광 헤드 장치에 있어서, 상기 광학계 내에 배치되고 상기 빔 스프릿터를 통해 상기 레이저 원으로부터 상기 대물 렌즈 상에 입사된 광속의 빔 직경을 확대하는 빔 직경 확대 렌즈(14)를 포함하는 것을 특징으로 하는 광 헤드 장치.
  2. 제1항에 있어서, 상기 빔 직경 확대 렌즈는 원추형 렌즈로 구성된 것을 특징으로 하는 광 헤드 장치.
  3. 제1항에 있어서, 상기 빔 직경 확대 렌즈는 상기 빔 직경을 트랙킹 방향으로 상기 대물 렌즈의 전체 이동 범위에 걸쳐 확대하도록 구성되는 것을 특징으로 하는 광 헤드 장치.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019960041877A 1995-09-29 1996-09-24 대물 렌즈에 입사될 광의 빔 직경을 증가시키기 위한 렌즈계를 갖는 광 헤드 장치 KR970017263A (ko)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP7252883A JP2795233B2 (ja) 1995-09-29 1995-09-29 光ヘッド装置
JP95-252883 1995-09-29

Publications (1)

Publication Number Publication Date
KR970017263A true KR970017263A (ko) 1997-04-30

Family

ID=17243494

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019960041877A KR970017263A (ko) 1995-09-29 1996-09-24 대물 렌즈에 입사될 광의 빔 직경을 증가시키기 위한 렌즈계를 갖는 광 헤드 장치

Country Status (4)

Country Link
US (1) US5708642A (ko)
EP (1) EP0766237A1 (ko)
JP (1) JP2795233B2 (ko)
KR (1) KR970017263A (ko)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5804814A (en) * 1994-05-20 1998-09-08 Musha; Toru Optical pick-up head and integrated type optical unit for use in optical pick-up head

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4179708A (en) * 1978-02-27 1979-12-18 Rca Corporation Optical playback system having increased depth-of-field
JPS57117137A (en) * 1981-01-13 1982-07-21 Sony Corp Optical disc player
JPS59142519A (ja) * 1983-02-04 1984-08-15 Hitachi Ltd 光学系
JPS60132616U (ja) * 1984-02-13 1985-09-04 パイオニア株式会社 記録装置
JPH01290176A (ja) * 1988-05-18 1989-11-22 Sony Corp 光ディスクの高速シーク装置
NL8901245A (nl) * 1989-05-19 1990-12-17 Philips Nv Retrofokus objektieflens en optische aftastinrichting voorzien van een dergelijke lens.
JPH03241535A (ja) * 1990-02-19 1991-10-28 Nippon Columbia Co Ltd 光ビームの収束方法
JP2656371B2 (ja) * 1990-06-26 1997-09-24 富士通株式会社 光ディスク装置
JP3048695B2 (ja) * 1991-09-04 2000-06-05 昭和電線電纜株式会社 ケーブルの張力制御方法
US5157555A (en) * 1991-12-04 1992-10-20 General Electric Company Apparatus for adjustable correction of spherical aberration
DE69328385T2 (de) * 1992-06-19 2000-10-19 Sony Corp., Tokio/Tokyo Optisches Abtastgerät
JPH0778352A (ja) * 1993-09-10 1995-03-20 Ricoh Co Ltd 光ピックアップ装置の構成方法

Also Published As

Publication number Publication date
JPH0991747A (ja) 1997-04-04
JP2795233B2 (ja) 1998-09-10
US5708642A (en) 1998-01-13
EP0766237A1 (en) 1997-04-02

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