KR910020666A - 광학식 디스크드라이브의 포커싱 에러(focusing error) 검출장치 - Google Patents

광학식 디스크드라이브의 포커싱 에러(focusing error) 검출장치 Download PDF

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Publication number
KR910020666A
KR910020666A KR1019900007974A KR900007974A KR910020666A KR 910020666 A KR910020666 A KR 910020666A KR 1019900007974 A KR1019900007974 A KR 1019900007974A KR 900007974 A KR900007974 A KR 900007974A KR 910020666 A KR910020666 A KR 910020666A
Authority
KR
South Korea
Prior art keywords
focusing error
optical disk
disk drive
error detector
blocking plate
Prior art date
Application number
KR1019900007974A
Other languages
English (en)
Inventor
이철우
정승태
박수한
조건호
유익형
Original Assignee
정용문
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 정용문, 삼성전자 주식회사 filed Critical 정용문
Priority to KR1019900007974A priority Critical patent/KR910020666A/ko
Priority to JP3129637A priority patent/JPH04248135A/ja
Priority to EP91108966A priority patent/EP0459517A1/en
Publication of KR910020666A publication Critical patent/KR910020666A/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
    • G11B7/1381—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
    • 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

Landscapes

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

Abstract

내용 없음

Description

광학식 디스크드라이브의 포커싱 에러(FOCUSING ERROR) 검출장치
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제2도는 본 발명에 의한 촛점오차 검출방법으로 디스크와 대물렌즈간의 거리가 (a)는 가까울 때 (+), (b)는 정 위치(0), (c)는 멀 때 (-)를 나타낸 것이며, 제3도는 제2도 중 본 발명에 의한 차단판의 종류를 도시한 도면으로 (a)는 두날형 파단판, (b)는 흡수 또는 반사막을 증착한 차단판(투명판 포함), (c)는 흡수, 반사막 증착의 차단판을 예시한 것이며, 제4도는 제3동 중 두날형 차단판을 이용한 경우의 빔경로 및 포토다이오드에서의 빔형상으로 디스크와 대물렌즈간의 거리가 (a)는 정위치(0), (b)는 가까울 때 (+), (c)는 멀 때(-)이다.

Claims (3)

  1. 레이저다이오드로부터 출사되는 빔이 대물렌즈를 통해 디스크에 반사되어 정보를 판독할 때 상기 대물렌즈로부터의 광을 포토다이오드의 앞에서 반사빔을 촛점 부근에서 차폐하여 촛점오차를 감지하도록 하는 수단을 갖는 포커싱에러검출장치에 있어서, 상기 촛점오차 감지수단을 차단판(7)으로 형성시킨 것을 특징으로 하는 광학식 디스크 드라이브의 포커싱 에러 검출장치.
  2. 제1항에 있어서, 차단판(7)은 2개의 나이프엣지로 구성된 ㄷ자형 단면의 차폐막이 씌여져 완성되는 유리판인 것을 특징으로 하는 광학식 디스크 드라이브의 포커싱 에러 검출장치.
  3. 제1항에 있어서, 차단판(7)은 유리판상 일부에 흡수막을 증착시킨 것을 특징으로 하는 광학식 디스크 드라이브의 포커싱 에러 검출장치.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019900007974A 1990-05-31 1990-05-31 광학식 디스크드라이브의 포커싱 에러(focusing error) 검출장치 KR910020666A (ko)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1019900007974A KR910020666A (ko) 1990-05-31 1990-05-31 광학식 디스크드라이브의 포커싱 에러(focusing error) 검출장치
JP3129637A JPH04248135A (ja) 1990-05-31 1991-05-31 光学式ディスクドライブのフォーカスエラー検出装置
EP91108966A EP0459517A1 (en) 1990-05-31 1991-05-31 Focussing-error detecting apparatus for optical disk drive

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019900007974A KR910020666A (ko) 1990-05-31 1990-05-31 광학식 디스크드라이브의 포커싱 에러(focusing error) 검출장치

Publications (1)

Publication Number Publication Date
KR910020666A true KR910020666A (ko) 1991-12-20

Family

ID=19299613

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019900007974A KR910020666A (ko) 1990-05-31 1990-05-31 광학식 디스크드라이브의 포커싱 에러(focusing error) 검출장치

Country Status (3)

Country Link
EP (1) EP0459517A1 (ko)
JP (1) JPH04248135A (ko)
KR (1) KR910020666A (ko)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2265243B1 (es) * 2004-11-05 2008-01-01 Universidad Publica De Navarra Estructuras periodicas de radiacion coherente de agrupaciones de antenas.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57212631A (en) * 1981-06-23 1982-12-27 Victor Co Of Japan Ltd Focus detector of optical information reproducing device
JPH0762913B2 (ja) * 1984-08-17 1995-07-05 株式会社日立製作所 自動焦点制御方法

Also Published As

Publication number Publication date
EP0459517A1 (en) 1991-12-04
JPH04248135A (ja) 1992-09-03

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