[go: up one dir, main page]

KR870002557A - 자동초점 제어 방식 - Google Patents

자동초점 제어 방식 Download PDF

Info

Publication number
KR870002557A
KR870002557A KR1019850005883A KR850005883A KR870002557A KR 870002557 A KR870002557 A KR 870002557A KR 1019850005883 A KR1019850005883 A KR 1019850005883A KR 850005883 A KR850005883 A KR 850005883A KR 870002557 A KR870002557 A KR 870002557A
Authority
KR
South Korea
Prior art keywords
lens
focusing lens
semiconductor laser
deviation
spur
Prior art date
Application number
KR1019850005883A
Other languages
English (en)
Other versions
KR920007316B1 (ko
Inventor
시게루 나가무라
요시도 쯔노다
다게시 마에다
Original Assignee
미쓰다 가쓰시게
가부시기가이샤 히다찌세이사꾸쇼
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 미쓰다 가쓰시게, 가부시기가이샤 히다찌세이사꾸쇼 filed Critical 미쓰다 가쓰시게
Publication of KR870002557A publication Critical patent/KR870002557A/ko
Application granted granted Critical
Publication of KR920007316B1 publication Critical patent/KR920007316B1/ko
Expired 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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • 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
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/08547—Arrangements for positioning the light beam only without moving the head, e.g. using static electro-optical elements
    • 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
    • G11B7/08—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
    • 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
    • G11B7/0916—Foucault or knife-edge methods
    • 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
    • G11B7/1374—Objective lenses

Landscapes

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

Abstract

내용 없음

Description

자동 초점 제어 방식
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제3도는 본 발명의 광 디스크의 광 헤드에 사용한 1실시예를 도시한 도면.
제4도는 제3도의 반도체 레이저의 발진 파장과 초점 스퍼트 위치의 관계를 도시한 도면.
제5도는 디스크 에러에 대한 재생 신호의 강도의 변화를 도시한 도면.

Claims (9)

  1. 싱글 모오드 발진을 하는 반도체 레이저와, 이 반도체 레이저의 출사광을 정보 매체의 면위에다 스퍼트로서 결상시키는 초점 조정 렌즈와, 상기 스퍼트와 정보 매체의 면과의 편차를 검출하는 초점 에러 검출 수단과, 상기 초점 에러 검출 수단의 출력 신호에 응답해서 상기 스퍼트와 정보 매체의 면과의 편차를 보정하는 초점 에러 보정 수단으로 이루어지고, 상기 정보 매체로 부터의 반사광의 적어도 일부를 상기 반도체 레이저에 되돌려 보내는 것과 동시에 상기 초점 조정 렌즈에는 색수차가 있으며 상기 초점 조정 렌즈가 다른 레이저 파장에 대해서 그 광축방향의 다른 위치에다 상기 스퍼트를 결상하는 것을 특징으로 하는 자동초점 제어 방식.
  2. 상기 초점 조정 렌즈는 파장 변화 1nm당, 상기 스퍼트의 결상 위치의 편차가 3/2 λ/NA2이하인 것을 특징으로 하는 특허 청구의 범위 제1항 기재의 자동 초점 제어 방식. 단 상기식에서 λ는 상기 반도체 레이저의 중심 파장, NA는 상기 초점 조정 렌즈의 개구수이다.
  3. 상기 반도체 레이저에 되돌려 보내는 광의 양이 5% 이상이고, 상기 초점 조정 렌즈는 파장 변화 1nm당 상기 스퍼트의 결상 위치의 편차가 1/20 λ/NA2이상인 것을 특징으로 하는 특허 청구의 범위 제2항 기재의 자동 초점 제어 방식.
  4. 상기 반도체 레이저에 되돌려 보내는 광의 양이 1-5%이고, 상기 초점 조정 렌즈는 파장 변화 1nm당 상기 스퍼트의 결상 위치의 편차가 1/10 λ/NA2이상인 것을 특징으로 하는 특허 청구의 범위 제2항 기재의 자동 초점 제어 방식.
  5. 상기 반도체 레이저에 되돌려 보내는 광의 양이 0.5-1%이고 상기 초점 조정 렌즈는 파장 변화 1nm당 상기 스퍼트의 결상 위치의 편차가 1/5 λ/NA2이상인 것을 특징으로 하는 특허 청구의 범위 제2항 기재의 자동 초점 제어 방식.
  6. 특허 청구의 범위 제1항에 있어서 상기 초점 조정렌즈가 복수개의 조합렌즈로 이루어진 것을 특징으로 한다.
  7. 특허 청구의 범위 제6항에 있어서 상기 조합 렌즈는 압베수가 작은 재질로 된 볼록 렌즈와 압베수가 큰 재질로 된 오목 렌즈로 이루어진 것을 특징으로 한다.
  8. 특허 청구의 범위 제1항에 있어서 상기 초점 조정렌즈는 프레넬존 플레이트 렌즈로 된 것을 특징으로 한다.
  9. 특허 청구의 범위 제1항에 있어서 상그 초점 조정렌즈가 홀로그램 렌즈로 된 것을 특징으로 한다.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019850005883A 1984-08-17 1985-08-16 자동초점 제어방식 Expired KR920007316B1 (ko)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP59-170416 1984-08-17
JP59170416A JPH0762913B2 (ja) 1984-08-17 1984-08-17 自動焦点制御方法

Publications (2)

Publication Number Publication Date
KR870002557A true KR870002557A (ko) 1987-03-31
KR920007316B1 KR920007316B1 (ko) 1992-08-29

Family

ID=15904517

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019850005883A Expired KR920007316B1 (ko) 1984-08-17 1985-08-16 자동초점 제어방식

Country Status (5)

Country Link
US (1) US4725721A (ko)
EP (1) EP0171816B1 (ko)
JP (1) JPH0762913B2 (ko)
KR (1) KR920007316B1 (ko)
DE (1) DE3567982D1 (ko)

Families Citing this family (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2572515B1 (fr) * 1984-10-25 1993-06-18 Canon Kk Dispositif de detection de position
US4815058A (en) * 1985-10-21 1989-03-21 Hitachi, Ltd. Optical information processing apparatus
JPH0792925B2 (ja) * 1986-03-24 1995-10-09 株式会社日立製作所 光デイスク装置の光ヘツド
KR910002322B1 (ko) * 1986-09-20 1991-04-11 후지쓰 가부시끼가이샤 회절격자렌즈 조립체를 구비하고 있는 광학시스템
JPH0693302B2 (ja) * 1986-10-17 1994-11-16 株式会社日立製作所 光磁気記録再生装置
US5202867A (en) * 1987-01-29 1993-04-13 Canon Kabushiki Kaisha Condensing optical system with corrected chromatic aberration, and information recording/reproducing apparatus using this optical system
US4891799A (en) * 1987-03-13 1990-01-02 Fuji Electrochemical Co., Ltd. Optical head apparatus for writing and reading data on an optical disk having a lens with an inclined optical axis
US4861975A (en) * 1987-07-07 1989-08-29 The Board Of Trustees Of The Leland Stanford Junior University Variable focus optical system and method using electro-optic material
JPH01105338A (ja) * 1987-07-14 1989-04-21 Mitsubishi Electric Corp 光記録再生装置
FR2620537B1 (fr) * 1987-09-14 1991-07-26 Micro Controle Dispositif optique a mise au point automatique et appareil optique comportant un tel dispositif
NL9000135A (nl) * 1989-01-30 1990-08-16 Seiko Epson Corp Focusseermechanisme en optische kop.
US5276663A (en) * 1989-04-17 1994-01-04 Canon Kabushiki Kaisha Optical information recording-reproducing apparatus including a condensing lens secured to a lens barrel
JPH0354740A (ja) * 1989-07-24 1991-03-08 Matsushita Electric Ind Co Ltd 光学情報記録部材および光学情報記録再生装置
JPH0369025A (ja) * 1989-08-07 1991-03-25 Oki Electric Ind Co Ltd 光ディスク装置の焦点調整方法
US4973832A (en) * 1989-11-03 1990-11-27 Eastman Kodak Company Optical head chromatically optimized for self-focusing
US5115420A (en) * 1990-01-16 1992-05-19 International Business Machines Corporation Utilizing wasted laser light in optical systems
US5235591A (en) * 1990-01-19 1993-08-10 Hitachi, Ltd. Stack type optical disc apparatus, sealed and separate type optical head therefor and optical disc medium
GB9002327D0 (en) * 1990-02-02 1990-04-04 Univ Sheffield Optical elements
KR910020666A (ko) * 1990-05-31 1991-12-20 정용문 광학식 디스크드라이브의 포커싱 에러(focusing error) 검출장치
US5105076A (en) * 1990-08-08 1992-04-14 Nikon Corporation Method and apparatus for detecting focusing errors utilizing chromatic aberration
JP2993248B2 (ja) * 1991-11-29 1999-12-20 新日本製鐵株式会社 光ヘッドの誤差検出装置
US5930224A (en) * 1995-04-25 1999-07-27 Olympus Optical Co., Ltd. Information recording/reproduction apparatus
KR970012379A (ko) * 1995-08-31 1997-03-29 배순훈 듀얼 포커스 광 픽업장치
JP3402997B2 (ja) * 1997-03-12 2003-05-06 株式会社リコー 光ピックアップ装置
DE19713362A1 (de) 1997-03-29 1998-10-01 Zeiss Carl Jena Gmbh Konfokale mikroskopische Anordnung
US6208465B1 (en) 1997-04-25 2001-03-27 Galore Scantec Ltd. Method and apparatus for imaging an object by diffractive autofocus
IL120726A0 (en) * 1997-04-25 1997-08-14 Galore Scantec Ltd Autofocus system
US6650612B1 (en) * 1999-03-31 2003-11-18 Matsushita Electric Industrial Co., Ltd. Optical head and recording reproduction method
JP2001076377A (ja) * 1999-06-30 2001-03-23 Sony Corp 光ピックアップ及び光ディスク装置
DE10024685A1 (de) * 2000-05-18 2001-11-22 Zeiss Carl Jena Gmbh Anordnung zur konfokalen Autofokussierung
FR2826461B1 (fr) * 2001-06-25 2003-09-05 Sciences Tech Ind De La Lumier Syteme autofocus, procede et dispositif de controle optique de pieces incorporant ce systeme
US20060146172A1 (en) * 2002-03-18 2006-07-06 Jacobsen Stephen C Miniaturized utility device having integrated optical capabilities
US8614768B2 (en) * 2002-03-18 2013-12-24 Raytheon Company Miniaturized imaging device including GRIN lens optically coupled to SSID
TWI268339B (en) * 2005-05-25 2006-12-11 Ind Tech Res Inst Displacement measuring device and method, an internal diameter measuring device by use of the variance of the wavelength to measure the displacement and the internal diameter
US7835074B2 (en) * 2007-06-05 2010-11-16 Sterling Lc Mini-scope for multi-directional imaging
US7969659B2 (en) * 2008-01-11 2011-06-28 Sterling Lc Grin lens microscope system
US20090287048A1 (en) * 2008-05-16 2009-11-19 Sterling Lc Method and apparatus for imaging within a living body
JP5596027B2 (ja) 2008-06-18 2014-09-24 レイセオン カンパニー カテーテル
WO2009155432A2 (en) * 2008-06-18 2009-12-23 Sterling Lc Miniaturized imaging device multiple grin lenses optically coupled to multiple ssids
WO2010014792A2 (en) * 2008-07-30 2010-02-04 Sterling Lc Method and device for incremental wavelength variation to analyze tissue
WO2010053916A2 (en) 2008-11-04 2010-05-14 Sterling Lc Method and device for wavelength shifted imaging
WO2011041728A2 (en) 2009-10-01 2011-04-07 Jacobsen Stephen C Needle delivered imaging device
US8717428B2 (en) 2009-10-01 2014-05-06 Raytheon Company Light diffusion apparatus
WO2011041720A2 (en) 2009-10-01 2011-04-07 Jacobsen Stephen C Method and apparatus for manipulating movement of a micro-catheter
US8828028B2 (en) 2009-11-03 2014-09-09 Raytheon Company Suture device and method for closing a planar opening
US8479998B2 (en) 2011-01-31 2013-07-09 Hand Held Products, Inc. Terminal having optical imaging assembly
FI127908B (en) * 2015-09-22 2019-05-15 Teknologian Tutkimuskeskus Vtt Oy Method and apparatus for measuring surface height

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7608561A (nl) * 1976-08-02 1978-02-06 Philips Nv Optische uitleeseenheid voor het aftasten van een registratiedrager voorzien van een stra- lingsreflekterende informatiestruktuur.
JPS54124705A (en) * 1978-03-20 1979-09-27 Teac Corp Optical reproducer
JPS54644A (en) * 1978-06-05 1979-01-06 Canon Inc Fixing apparatus
JPS5694528A (en) * 1979-12-28 1981-07-31 Matsushita Electric Ind Co Ltd Drawing-in method of focus servo
JPS599086B2 (ja) * 1980-08-20 1984-02-29 株式会社日立製作所 光学的情報再生装置
JPS57108811A (en) * 1980-12-26 1982-07-07 Hitachi Ltd Optical focus position detector
JPS5853033A (ja) * 1981-09-26 1983-03-29 Foster Denki Kk 光学式記録情報再生装置
US4532619A (en) * 1982-01-22 1985-07-30 Hitachi, Ltd. Method and apparatus for reducing semiconductor laser optical noise
EP0098076A1 (en) * 1982-06-14 1984-01-11 Nec Corporation Beam access apparatus for optical disc system
EP0116753B1 (en) * 1982-12-07 1987-06-24 Secretary of State for Trade and Industry in Her Britannic Majesty's Gov. of the U.K. of Great Britain and Northern Ireland Improvements in or relating to apparatus to focus light on a surface
GB2131576B (en) * 1982-12-07 1986-12-03 Trade & Industry The Secretary Improvements in or relating to apparatus to focus light on a surface
JPS59119548A (ja) * 1982-12-25 1984-07-10 Pioneer Electronic Corp 光学式ピツクアツプ装置

Also Published As

Publication number Publication date
JPH0762913B2 (ja) 1995-07-05
US4725721A (en) 1988-02-16
KR920007316B1 (ko) 1992-08-29
EP0171816B1 (en) 1989-01-25
JPS6150226A (ja) 1986-03-12
DE3567982D1 (en) 1989-03-02
EP0171816A1 (en) 1986-02-19

Similar Documents

Publication Publication Date Title
KR870002557A (ko) 자동초점 제어 방식
KR0127482B1 (ko) 광학 주사장치, 주사장치에 사용하기 적합한 미러 대물렌즈, 주사장치가 설치된 광학 기록 및/또는 재생장치
KR910001672A (ko) 반도체 레이저 광학 헤드 어셈블리
KR930001153A (ko) 다중 데이터 표면 데이터 기억 시스템 및 방법
KR100207682B1 (ko) 광픽업장치의 레이저 비점격차 보상방법
KR900018927A (ko) 광픽업
KR100790419B1 (ko) 광학주사장치
JPH02306440A (ja) 光ヘッド用対物レンズおよび光ヘッド
JPS578929A (en) Optical pickup device
JPH0434740A (ja) 光学ヘッド
EP0886267A4 (en) FOCUSING DEVICE AND PROVIDED OPTICAL DEVICE
KR960038792A (ko) 광디스크의 기록 재생 방법
JPS6132649B2 (ko)
KR890016520A (ko) 광학적 정보 판독장치
JPS63200328A (ja) 光学ヘツドの対物ホログラムレンズ
US6324155B1 (en) Optical information recording medium with flat reflecting film and reading system for reading information recorded thereon
KR100536102B1 (ko) 기록매체광학주사장치
JPH09115171A (ja) 光ヘッド装置
KR930009680B1 (ko) 광기록 재생장치의 주사방법 및 장치
JPS54107706A (en) Information recording medium
JPH04209335A (ja) 発光部材
KR950001640A (ko) 분할비점수차법을 이용한 광헤드
JPH0138564Y2 (ko)
JPH0528570Y2 (ko)
JPH10275355A (ja) 光ヘッド用光学系

Legal Events

Date Code Title Description
PA0109 Patent application

Patent event code: PA01091R01D

Comment text: Patent Application

Patent event date: 19850816

PG1501 Laying open of application
A201 Request for examination
PA0201 Request for examination

Patent event code: PA02012R01D

Patent event date: 19891031

Comment text: Request for Examination of Application

Patent event code: PA02011R01I

Patent event date: 19850816

Comment text: Patent Application

G160 Decision to publish patent application
PG1605 Publication of application before grant of patent

Comment text: Decision on Publication of Application

Patent event code: PG16051S01I

Patent event date: 19920731

E701 Decision to grant or registration of patent right
PE0701 Decision of registration

Patent event code: PE07011S01D

Comment text: Decision to Grant Registration

Patent event date: 19921124

GRNT Written decision to grant
PR0701 Registration of establishment

Comment text: Registration of Establishment

Patent event date: 19921215

Patent event code: PR07011E01D

PR1002 Payment of registration fee

Payment date: 19921215

End annual number: 3

Start annual number: 1

PR1001 Payment of annual fee

Payment date: 19950811

Start annual number: 4

End annual number: 4

PR1001 Payment of annual fee

Payment date: 19960819

Start annual number: 5

End annual number: 5

PR1001 Payment of annual fee

Payment date: 19970822

Start annual number: 6

End annual number: 6

PR1001 Payment of annual fee

Payment date: 19971223

Start annual number: 7

End annual number: 9

PR1001 Payment of annual fee

Payment date: 20010820

Start annual number: 10

End annual number: 10

FPAY Annual fee payment

Payment date: 20020819

Year of fee payment: 11

PR1001 Payment of annual fee

Payment date: 20020819

Start annual number: 11

End annual number: 11

LAPS Lapse due to unpaid annual fee
PC1903 Unpaid annual fee