KR950001640A - 분할비점수차법을 이용한 광헤드 - Google Patents

분할비점수차법을 이용한 광헤드 Download PDF

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Publication number
KR950001640A
KR950001640A KR1019930010646A KR930010646A KR950001640A KR 950001640 A KR950001640 A KR 950001640A KR 1019930010646 A KR1019930010646 A KR 1019930010646A KR 930010646 A KR930010646 A KR 930010646A KR 950001640 A KR950001640 A KR 950001640A
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KR
South Korea
Prior art keywords
light beam
light
optical head
diffraction
optical
Prior art date
Application number
KR1019930010646A
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English (en)
Other versions
KR0139177B1 (ko
Inventor
황원재
문종국
이문규
Original Assignee
김광호
삼성전자 주식회사
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 김광호, 삼성전자 주식회사 filed Critical 김광호
Priority to KR1019930010646A priority Critical patent/KR0139177B1/ko
Priority to DE69418528T priority patent/DE69418528T2/de
Priority to EP94304160A priority patent/EP0628955B1/en
Priority to JP6128913A priority patent/JPH0757295A/ja
Priority to CN94102803A priority patent/CN1044418C/zh
Publication of KR950001640A publication Critical patent/KR950001640A/ko
Application granted granted Critical
Publication of KR0139177B1 publication Critical patent/KR0139177B1/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
    • G11B7/08—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
    • 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
    • G11B7/08—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

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

Abstract

본 발명은 홀로그램을 이용하는 광헤드에서 주위온도변화에 의해 홀로그램을 통과하는 광빔의 회절각 변화에 의한 광반점의 형성위치변화에도 불구하고 입사광에 의한 광반점을 수용할 수 있는 형상의 포토다이오우드들을 이용한다. 따라서, 파장의 변경에 의해 회절각이 바뀐 광빔을 입사받을 수 있으므로 주위온도의 변화에도 불구하고 오프셋이 들어있지 않은 초점에러 및 트랙킹에러를 검출할 수 있는 효과를 가져온다.

Description

분할비점수차법을 이용한 광헤드
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제 3 도는 본 발명의 바람직한 일실시예에 따른 광헤드의 개략적인 구성도, 제 4 도는 홀로그램들에 의해 포토다이오우드상으로 투사되는 광빔의 형태를 나타낸 개념도, 제 5 도는 홀로그램에 의해 회전되는 광반점을 나타낸 도면.

Claims (6)

  1. 광저장매체로부터의 신호독출에 이용되는 광빔을 방출하는 광방출수단과, 광저장매체로 입사하는 광빔의 초점조절에 이용되는 대물렌즈와, 상기 광방출수단에 대해 상대적으로 일정한 위치에 고정되며 광저장매체에서 반사되어 대물렌즈를 통과한 광빔을 검출하는 광검출수단을 갖는 광헤드에 있어서, 상기 대물렌즈와 광방출수단사이의 광축상에서 상기 광빔의 소정 파장에 의해 위치가 결정되고, 상기 대물렌즈로부터 입사하는 광빔을 그 입사위치에 따라 서로다른 복수개의 각도로 회절시키는 회절수단 ; 회절수단에 의해 회절되는 상기 소정 파장의 광빔과 다른 소정 파장의 광빔을 입사받아 트랙킹에러 및 초점에러를 검출할 수 있는 광검출수단을 포함하는 광헤드.
  2. 제 1 항에 있어서, 상기 회절수단은 서로다른 회절각을 갖는 복수의 홀로그램을 구비함을 특징으로 하는 광헤드.
  3. 제 2 항에 있어서, 상기 광검출수단은 광빔의 회절방향에 나란한 방향의 길이가 회절방향에 수직한 방향의 길이보다 긴 복수개의 포토다이오우드를 구비함을 특징으로 하는 광헤드.
  4. 제 3 항에 있어서, 상기 회절수단은 2개의 홀로그램으로 이루어진 것을 특징으로 하는 광헤드.
  5. 제 4 항에 있어서, 상기 광검출수단은 분할비점수차법을 이용하여 초점에러를 검출하고 푸시-풀법을 이용하여 트랙킹에러를 검출하기 위해 서로 인접되게 배치된 4분할 포다이오우드를 구비함을 특징으로 하는 광헤드.
  6. 제 5 항에 있어서, 상기 광검출수단은 레이저다이오드 칩과 하나의 패키지화된 것을 특징으로 하는 광헤드.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019930010646A 1993-06-11 1993-06-11 초점에러 및 트랙킹에러를 검출하기 위하여 홀로그램을 사용하는 광헤드 KR0139177B1 (ko)

Priority Applications (5)

Application Number Priority Date Filing Date Title
KR1019930010646A KR0139177B1 (ko) 1993-06-11 1993-06-11 초점에러 및 트랙킹에러를 검출하기 위하여 홀로그램을 사용하는 광헤드
DE69418528T DE69418528T2 (de) 1993-06-11 1994-06-09 Optischer Kopf
EP94304160A EP0628955B1 (en) 1993-06-11 1994-06-09 Optical head
JP6128913A JPH0757295A (ja) 1993-06-11 1994-06-10 ホログラムレンズを用いる光ヘッド
CN94102803A CN1044418C (zh) 1993-06-11 1994-06-10 使用全息图检测焦点误差和跟踪误差的激光头

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019930010646A KR0139177B1 (ko) 1993-06-11 1993-06-11 초점에러 및 트랙킹에러를 검출하기 위하여 홀로그램을 사용하는 광헤드

Publications (2)

Publication Number Publication Date
KR950001640A true KR950001640A (ko) 1995-01-03
KR0139177B1 KR0139177B1 (ko) 1998-06-01

Family

ID=19357250

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019930010646A KR0139177B1 (ko) 1993-06-11 1993-06-11 초점에러 및 트랙킹에러를 검출하기 위하여 홀로그램을 사용하는 광헤드

Country Status (5)

Country Link
EP (1) EP0628955B1 (ko)
JP (1) JPH0757295A (ko)
KR (1) KR0139177B1 (ko)
CN (1) CN1044418C (ko)
DE (1) DE69418528T2 (ko)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6292441B1 (en) 1997-04-16 2001-09-18 Matsushita Electric Industrial Co., Ltd. Optical head device, optical information apparatus, and method for detecting focus error signal
JP5187364B2 (ja) 2010-08-24 2013-04-24 カシオ計算機株式会社 回折光学素子、並びに測距装置及び測距方法

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62103857A (ja) * 1985-10-31 1987-05-14 Mitsubishi Electric Corp 光ピツクアツプ装置
US4731772A (en) * 1986-05-06 1988-03-15 Lee Wai Hon Optical head using hologram lens for both beam splitting and focus error detection functions
DE3855936T2 (de) * 1987-08-24 1998-01-02 Sharp Kk Optische Abtastvorrichtung
JPH01151022A (ja) * 1987-12-09 1989-06-13 Sharp Corp 光ピックアップ装置
JP2692119B2 (ja) * 1988-03-31 1997-12-17 松下電器産業株式会社 光ピックアップヘッド装置
US5066138A (en) * 1988-06-16 1991-11-19 Mitsubishi Denki Kabushiki Kaisha Optical head apparatus
JPH0258739A (ja) * 1988-08-24 1990-02-27 Matsushita Electric Ind Co Ltd 光ヘッド装置
JPH0677335B2 (ja) * 1988-10-21 1994-09-28 シャープ株式会社 光ピックアップ装置
JPH02121131A (ja) * 1988-10-28 1990-05-09 Olympus Optical Co Ltd 光ピックアップ
JPH0626024B2 (ja) * 1988-12-20 1994-04-06 日本電気株式会社 光ヘッド装置
JP2766348B2 (ja) * 1989-11-02 1998-06-18 オリンパス光学工業株式会社 光学ヘッド
JP2656136B2 (ja) * 1990-05-29 1997-09-24 シャープ株式会社 光ピックアップ装置

Also Published As

Publication number Publication date
CN1101157A (zh) 1995-04-05
EP0628955A1 (en) 1994-12-14
KR0139177B1 (ko) 1998-06-01
EP0628955B1 (en) 1999-05-19
DE69418528T2 (de) 1999-12-23
DE69418528D1 (de) 1999-06-24
CN1044418C (zh) 1999-07-28
JPH0757295A (ja) 1995-03-03

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