KR950015241A - 광픽업의 포커스에러 검출방법 및 그 장치 - Google Patents

광픽업의 포커스에러 검출방법 및 그 장치 Download PDF

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Publication number
KR950015241A
KR950015241A KR1019930024390A KR930024390A KR950015241A KR 950015241 A KR950015241 A KR 950015241A KR 1019930024390 A KR1019930024390 A KR 1019930024390A KR 930024390 A KR930024390 A KR 930024390A KR 950015241 A KR950015241 A KR 950015241A
Authority
KR
South Korea
Prior art keywords
light beam
recording medium
optical recording
focus error
detection element
Prior art date
Application number
KR1019930024390A
Other languages
English (en)
Inventor
박찬규
Original Assignee
배순훈
대우전자 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 배순훈, 대우전자 주식회사 filed Critical 배순훈
Priority to KR1019930024390A priority Critical patent/KR950015241A/ko
Priority to US08/340,675 priority patent/US5550368A/en
Priority to CN94120132A priority patent/CN1113338A/zh
Priority to JP6281981A priority patent/JPH07182666A/ja
Publication of KR950015241A publication Critical patent/KR950015241A/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
    • 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
    • G11B7/0908—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
    • G11B7/08—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

Abstract

본 발명은 광픽업의 포커스에러 검출방법 및 그 장치에 관한 것으로서, 광량의 극소화시킬 수 있는 광픽업의 포커스에러 검출방법 및 그 장치를 제공한다. 본 발명은, 광기록 매체로부터 반사된 광빔으로 부터 각각 포커스 에러신호를 검출하는 제1, 제2검출소자와, 상기 광기록매체로부터 반사되는 광빔의 광축에 대하여 소정 각도 경사지게 설치되며 반사된 광빔중 일부를 상기 제1검출소자로 통과시키고 일부를 일부를 상기 제2검출소자로 반사시키는 일측면이 반사면으로 이루어진 나이프에지와 상기 제1, 제2검출소자에 의해 검출된 신호를 차동증폭시키는 차동증폭기를 구비하여 구성된다. 따라서 광량의 손실로 인한 검출감도 저하현상과 극성 반전형상 및 RF신호의 출력저하 현상을 방지할 수 있게 된다.

Description

광픽업의 포커스에러 검출방법 및 그 장치
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제3도는 본 발명에 따른 광픽업의 포커스에러 검출장치를 도시한 개략도.
제4도는 본 발명에 따른 광픽업의 포커스에러 검출방법을 설명하기 위한 참고도.

Claims (3)

  1. 일측면에 반사면이 형성된 나이프에지를 광기록매체로부터 반사되는 광빔의 광축에 대하여 소정각도 경사지게 배치하여 광기록매체로부터 반사되는 광빔의 일부를 차단시켜 제2검출소자로 반사시킴과 동시에 나머지 광빔을 제1검출소자로 통과시키고, 상기 제1, 제2검출소자에 의해 각각 검출된 신호를 차동증폭하여 포커스에러를 검출하는 것을 특징으로 하는 광픽업의 포커스 에러 검출방법.
  2. 광기록매체로부터 반사된 광빔으로부터 각각 포커스 에러신호를 검출하는 제1, 제2검출소자와, 상기 광기록매체로부터 반사되는 광빔의 광축에 대하여 소정각도 경사지게 배치되며 반사된 광빔중 일부를 상기 제1검출소자로 통과시키고 일부를 상기 제2검출소자로 반사시키는 일측면이 반사면으로 이루어진 나이프에지와, 상기 제1, 제2검출소자에 의해 각각 검출된신호를 차동증폭시키는 차동증폭기를 구비하여 구성된 것을 특징으로 하는 광픽업의 포커스에러 검출장치.
  3. 제2항에 있어서 상기 나이프에지가 상기 광기록매체로부터 반사되는 광빔의 광축에 대하여 45도 경사지게 배치된 것을 특징으로 하는 광픽업의 포커스에러 검출장치.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019930024390A 1993-11-16 1993-11-16 광픽업의 포커스에러 검출방법 및 그 장치 KR950015241A (ko)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR1019930024390A KR950015241A (ko) 1993-11-16 1993-11-16 광픽업의 포커스에러 검출방법 및 그 장치
US08/340,675 US5550368A (en) 1993-11-16 1994-11-16 Method of detecting focusing error in an optical pickup system employing a reflective knife edge to separate the optical signal for comparison
CN94120132A CN1113338A (zh) 1993-11-16 1994-11-16 在拾光系统中检测聚焦误差的刃形边缘法
JP6281981A JPH07182666A (ja) 1993-11-16 1994-11-16 光ピックアップシステム

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019930024390A KR950015241A (ko) 1993-11-16 1993-11-16 광픽업의 포커스에러 검출방법 및 그 장치

Publications (1)

Publication Number Publication Date
KR950015241A true KR950015241A (ko) 1995-06-16

Family

ID=19368214

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019930024390A KR950015241A (ko) 1993-11-16 1993-11-16 광픽업의 포커스에러 검출방법 및 그 장치

Country Status (4)

Country Link
US (1) US5550368A (ko)
JP (1) JPH07182666A (ko)
KR (1) KR950015241A (ko)
CN (1) CN1113338A (ko)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100452293B1 (ko) * 2002-01-07 2004-10-08 삼성전기주식회사 광 픽업장치

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5623470A (en) * 1995-12-28 1997-04-22 International Business Machines Corporation Reallocation of defective recording areas on CD-R or CD-E media
US5905254A (en) * 1996-09-30 1999-05-18 Daewoo Electronics Co., Ltd. Compact sized optical pickup system
WO2001026036A2 (en) 1999-10-04 2001-04-12 Welch Allyn Data Collection, Inc. Imaging module for optical reader
US7128266B2 (en) * 2003-11-13 2006-10-31 Metrologic Instruments. Inc. Hand-supportable digital imaging-based bar code symbol reader supporting narrow-area and wide-area modes of illumination and image capture

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61177645A (ja) * 1985-01-31 1986-08-09 Fujitsu Ltd 焦点誤差制御装置
US4868377A (en) * 1987-02-04 1989-09-19 Asahi Optical Co., Ltd. Optical pickup for reading optical disk information provided with error detecting means by knife edge test
JPH01116930A (ja) * 1987-10-29 1989-05-09 Canon Inc 光ビーム位置検出装置
JPH02265028A (ja) * 1989-04-06 1990-10-29 Mitsubishi Electric Corp 光記録再生装置
JP2710675B2 (ja) * 1989-10-30 1998-02-10 株式会社日本コンラックス 光学情報記録再生用光ヘッド
JP3485594B2 (ja) * 1992-10-09 2004-01-13 オリンパス株式会社 光ヘッド
KR100269161B1 (ko) * 1993-02-27 2000-10-16 윤종용 광헤드

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100452293B1 (ko) * 2002-01-07 2004-10-08 삼성전기주식회사 광 픽업장치

Also Published As

Publication number Publication date
CN1113338A (zh) 1995-12-13
US5550368A (en) 1996-08-27
JPH07182666A (ja) 1995-07-21

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E601 Decision to refuse application