KR960019141A - 포커스에러 검출장치 - Google Patents

포커스에러 검출장치 Download PDF

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Publication number
KR960019141A
KR960019141A KR1019940031841A KR19940031841A KR960019141A KR 960019141 A KR960019141 A KR 960019141A KR 1019940031841 A KR1019940031841 A KR 1019940031841A KR 19940031841 A KR19940031841 A KR 19940031841A KR 960019141 A KR960019141 A KR 960019141A
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KR
South Korea
Prior art keywords
critical angle
focus error
reflected
reflected light
light
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KR1019940031841A
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English (en)
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KR100200832B1 (ko
Inventor
이철우
정종삼
유장훈
임경화
Original Assignee
김광호
삼성전자 주식회사
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Publication date
Application filed by 김광호, 삼성전자 주식회사 filed Critical 김광호
Priority to KR1019940031841A priority Critical patent/KR100200832B1/ko
Priority to US08/458,165 priority patent/US5629514A/en
Publication of KR960019141A publication Critical patent/KR960019141A/ko
Application granted granted Critical
Publication of KR100200832B1 publication Critical patent/KR100200832B1/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
    • G11B7/08—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
    • G11B7/1356—Double or multiple prisms, i.e. having two or more prisms in cooperation
    • 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
    • G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
    • 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
    • G11B7/0943—Methods and circuits for performing mathematical operations on individual detector segment outputs
    • 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
    • G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
    • G11B2007/0919—Critical angle methods

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

Abstract

광픽업에 있어서, 광디스크에 대한 대물렌즈의 포커스에러를 검출하기 위한 포커스에러 검출장치가 개시되어 있다. 그 장치는 광디스크(5)에서 반사된 반사광(10)의 광축이 시프트 또는 틸트되는 것에 의한 오류를 제거하기 위한 것으로서, 그 반사광을 회절 분할하는 회전소자(11), 이 회절된 반사광을 각각 임계각에서 반사시키는 임계각 반사면(12a,13a)을 가지는 2개의 임계각 프리즘(12,13), 그리고 각각의 임계각 반사면(12a,13a)에서 반사되는 회절된 광을 수광하는 2개의 2분할 광검출기(14,15)를 구비한다. 그리고 그 반사광의 시프트 또는 틸트에 의한 광량의 변화를 상쇄하는 방향으로 그 2분할 광검출기의 각 신호를 차동 및 가산하여 원하는 신호를 출력한다. 즉, 반사광의 광축 시프트 및 틸트와 무관하게 순순한 포커스에러 신호만을 출력하여 광픽업의 오동작을 막고 깨끗한 기록과 재생을 가능하게 하는 것이다.

Description

포커스에러 검출장치
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제4도는 본 발명에 따른 포커스에러 검출장치의 배치도,
제5도는 본 발명에 따른 포커스에러의 검출원리를 설명하기 위하여 나타낸 것으로, (가)는 합초점 상태, (나)는 디스크가 멀리 있는 상태, 그리고 (다)는 디스크가 가까이 있는 상태를 나타낸 배치도.

Claims (3)

  1. 평행한 입사광을 광디스크에 접속하는 대물렌즈의 포커스에러를 검출하기 위한 포커스에러 검출장치에 잇어서, 상기 광디스크에서 반사되어 상기 대물렌즈를 경유한 반사광을 2개의 회절광으로 회절시키는 회절소자와, 상기 2개의 회절광을 각각 임계각에서 반사시키는 임계각 반사수단과, 상기 임계각 반사수단에 의하여 각각 반사되는 상기 2개의 회절광을 각각 수광하여 그 수광되는 광량에 따른 신호를 검출하는 2개의 2분할광검출기와, 상기 2개의 2분할 광검출기의 검출되는 신호를 상기 반사광의 틸트나 시프트에 의한 광량 편차를 상쇄하는 방향으로 차동 및 가산하여 상기한 포커스에러의 정도를 알리는 신호를 출력하기 위한 회로수단을 구비하여 되는 것을 특징으로 하는 포커스에러 검출장치.
  2. 제1항에 있어서, 상기 임계각 반사수단이 상기 2개의 회절광을 각각 임계각 보다 큰 각에서 반사시키는 임계각 반사면을 가지는 2개의 임계각 프리즘을 구비하여 되는 것을 특징으로 하는 포커스에러 검출장치.
  3. 제1항에 있어서, 상기 2개의 회절광 각각은 상기 회절소자에 입사되는 반사광에 대하여 서로 대칭인 것을 특징으로 하는 포커스에러 검출장치.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019940031841A 1994-11-29 1994-11-29 포커스 에러검출장치 KR100200832B1 (ko)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1019940031841A KR100200832B1 (ko) 1994-11-29 1994-11-29 포커스 에러검출장치
US08/458,165 US5629514A (en) 1994-11-29 1995-06-02 Critical angle focus error detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019940031841A KR100200832B1 (ko) 1994-11-29 1994-11-29 포커스 에러검출장치

Publications (2)

Publication Number Publication Date
KR960019141A true KR960019141A (ko) 1996-06-17
KR100200832B1 KR100200832B1 (ko) 1999-06-15

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ID=19399541

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Application Number Title Priority Date Filing Date
KR1019940031841A KR100200832B1 (ko) 1994-11-29 1994-11-29 포커스 에러검출장치

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US (1) US5629514A (ko)
KR (1) KR100200832B1 (ko)

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Publication number Priority date Publication date Assignee Title
US6888951B1 (en) 1999-08-23 2005-05-03 Nagaoka & Co., Ltd. Methods and apparatus for analyzing operational and analyte data acquired from optical disc
US7061594B2 (en) * 2000-11-09 2006-06-13 Burstein Technologies, Inc. Disc drive system and methods for use with bio-discs
WO2002056311A2 (en) * 2001-01-11 2002-07-18 Burstein Technologies Inc Optical disc analysis system including related methods for biological and medical imaging
US7221632B2 (en) * 2001-07-12 2007-05-22 Burstein Technologies, Inc. Optical disc system and related detecting methods for analysis of microscopic structures
US20080094974A1 (en) * 2001-11-09 2008-04-24 Burstein Technologies, Inc. Optical disc system and related detecting methods for analysis of microscopic structures
US7253929B2 (en) * 2002-02-06 2007-08-07 Quad/Tech, Inc. Camera assembly for a printing press
EP2287843A3 (en) * 2003-07-07 2011-04-13 Panasonic Corporation Objective lens, optical pick-up device, and optical disk device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3802538A1 (de) * 1987-01-28 1988-08-11 Olympus Optical Co Vorrichtung zum erfassen von fotomagnetischen signalen
JPH04364231A (ja) * 1991-01-07 1992-12-16 Toshiba Corp 光学ヘッド装置
JP3241781B2 (ja) * 1991-08-22 2001-12-25 松下電器産業株式会社 光ヘッド装置および光情報記録装置、光情報再生装置
US5353267A (en) * 1992-06-02 1994-10-04 Nec Corporation Magneto-optical light detector apparatus
JPH06111334A (ja) * 1992-09-24 1994-04-22 Sony Corp 円盤状記録媒体用の記録及び／又は再生装置、光検出器及び光ヘッド

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US5629514A (en) 1997-05-13
KR100200832B1 (ko) 1999-06-15

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