KR940012274A - 광픽업 장치 - Google Patents

광픽업 장치 Download PDF

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KR940012274A
KR940012274A KR1019920020835A KR920020835A KR940012274A KR 940012274 A KR940012274 A KR 940012274A KR 1019920020835 A KR1019920020835 A KR 1019920020835A KR 920020835 A KR920020835 A KR 920020835A KR 940012274 A KR940012274 A KR 940012274A
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South Korea
Prior art keywords
hologram
laser beam
photodetector
optical
focused
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KR1019920020835A
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English (en)
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KR950005033B1 (ko
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양근영
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이헌조
주식회사 금성사
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Priority to KR1019920020835A priority Critical patent/KR950005033B1/ko
Priority to US08/143,145 priority patent/US5493425A/en
Priority to GB9322484A priority patent/GB2272323B/en
Priority to JP5276657A priority patent/JPH06223400A/ja
Publication of KR940012274A publication Critical patent/KR940012274A/ko
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Publication of KR950005033B1 publication Critical patent/KR950005033B1/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
    • 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
    • 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
    • G11B7/0901—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 track following 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
    • G11B7/0901—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 track following only
    • G11B7/0903—Multi-beam tracking systems
    • 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
    • G11B7/0912—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 by push-pull method
    • 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
    • G11B7/08—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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/13—Optical detectors therefor
    • G11B7/131—Arrangement of detectors in a multiple array
    • 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

Abstract

본 발명은 광픽업 장치(Optical Pickup System)에 관한 것이다.
종래에는 광학계 자체가 많은 부피를 차지하고, 또한 이들이 배치가 공간적으로 이루어지며, 반도체 레이저(3)와 포토디턱터(7)가 분리되어, 장치의 크기가 커지고 무게 또한 무거워져 광디스크(1)상에 기록된 정보를 읽는데 필요한 시간이 느려지는 주된 원인이 되고, 또한 광부품들이 독자적으로 고정되어야 하므로 조립 시간이오래 걸리고 조립성이 나쁘므로 제조원가의 상승요인이 되는 문제점이 있었다. 본 발명은 광원으로 사용되는 반도체 레이저(4)와, 반도체 레이저(4)로부터 발생하는 발산광(9)을 광디스크(1)상에 집속시키는 대물랜즈(2)와, 광디스크(1)에 의해 반사되어 대물렌즈(2)를 통과한 후, 집속되는 레이저 빔을 4분할 포토디텍터(5)에 집속시키는 4분할 홀로그램(3)과, 홀로그램(3)(H1,H2, H3, H4)에 의해 회절, 접속되는 레이저 빔을 검지하는 4분할 포토 디텍터(5)(P1,P2,P3,P4)의 순으로 레이저 빔의 진행광로를 구성하여, 홀로그램(3)을 사용하여 기존의 광픽업 기능을 가능하게 하고, 또한 반도체 레이저(4)와 포토디텍터(5)를 하나의 모듈로 구성할 수 있어 광픽업을 소형 및 경량화 시킬수 있기 때문에 픽업을 사용하는 기기에서 정보의 읽는 속도를 증가시킬수 있으며, 조립을 용이하게 하도록 한 것이다.

Description

광픽업 장치
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제2도는 본 발명에 의한 광픽업 장치의 광학계 구성을 보인 사시도,
제3도는 본 발명에 의한 광픽업 장치의 요부 구성을 보인 평면도,
제4도의 (가) 및 (나)는 본 발명에 의한 광픽업 장치의 작용도,
제7도는 본 발명에 의한 광픽업 장치의 집속위치 변화에 따른 포토디텍터상에서의 레이저 빔의 크기변화를 보인 설명도.

Claims (6)

  1. 광원으로 사용되는 반도체 레이저(4)와, 반도체 레이저(4)로부터 발생하는 발산광(9)을 광디스크(1)상에 접속시키는 대물렌즈(2)와, 광디스크(1)에 의해 반사되어 대물렌즈(2)를 통과한 후, 집속되는 레이저 빔을 4분할 포토디텍터(5)에 집속시키는 4분할 홀로그램(3)과, 홀로그램들(3)(H1,H2, H3, H4)에 의해 회절, 접속되는 레이저 빔을 검지하는 4분할 포토 디텍터(5)(P1,P2,P3,P4)의 순으로 레이저 빔의 진행광로를 구성함을 특징으로 하는 광픽업장치.
  2. 제1항에 있어서, 상기 4분할 홀로그램(3)(H1,H2, H3, H4)은 홀로그램(H1)의 광축이 포토디텍터(P1), 홀로그램(H2)의 광축이 포토디텍터(P3), 홀로그램(H3)이 광축이 포토디텍터(P2), 그리고 홀로그램(H4)의 광축이 프로디텍터(P4)의 중심을 통과하도록 구성되어, 상기 홀로그램(H1)에 의해 접속되는 레이저 빔은 포토디텍터(P1)을 지나서 집속되고, 홀로그램(H2)에 의해 집속되는 레이저 빔은 포토디텍터(P3)를 지나기 전에, 홀로그램(H3)에 집속되는 레이저 빔은 포토디텍터(P3)을 지나기 전에, 홀로그램(H3)에 의해 집속되는 레이저 빔도 포토디텍터(P2)를 지나기 전에, 그리고 홀로그램(H40에 의해 집속되는 레이저 빔은(P4)를 지나서 집속되도록 구성한 것을 특징으로 하는 광픽업 장치.
  3. 제1항에 있어서, 상기 4분할 홀로그램(H1,H2,H3,H4)의 참조광의 위치는 반도체 레이저의 발광점 즉, L1으로 하고 물체광위치는 각각 Q1,Q2,Q3,Q4로 하며, 상기 홀로그램(H1,H2,H3,H4)의 물체광 위치 Q1,Q2,Q3,Q4의 관계는 다음과 같은 조건을 만족하도록 구성한 것을 특징으로 하는 광픽업 장치.
    Q1(z) ＞ , Q4(z) ＞ L2, Q2(z) ＜ L2, Q3(z) ＜ L2
    Q1(x) ＜ 0, Q2(x) ＜ 0, Q3(x) ＞ 0, Q4(x) ＞ 0
  4. 제1항에 있어서, 상기 분할 포토디텍터(P1,P2,P3,P4)의 크기는 레이저 빔이 광디스크(1)에 정확하게 집속되었을때 포토디텍터들에 의해 차단되는 레이저 빔의 크기로 결정되며, 반도체 레이저(4)는 4분할 홀로그램(3)의 중심선상에 설치되고, 4분할 포토디텍터(5)는 광디스크(1)상에서 레이저 빔의 집속위치가 변할때 포토디텍터(50상에서 변화가 크게 나타나도록 반도체 레이저 보다 4분할 홀로그램(3)으로부터 먼 거리에 설치(즉 L1<L2)된 것을 특징으로 하는 광픽업 장치.
  5. 제1항에 있어서, 상기 포토디텍터(P1)과 (P4)의 전기적 신호를 합한 신호와 포토디텍터(P2)와 (P3)의 전기적 신호를 합한 신호의 차로 포커스 에러가 보정되며, 포토디텍터(P1)과 (P2)의 전기적 신호를 합한 신호와 포토 디텍터(P3)와 (P4)의 전기적 신호를 합한 신호와의 차이로 트랙킹 에러가 보정되고, 포토디텍터(5)(P1,P2,P3,P4)의 전기적 신호 모두를 더한 값이 광디스크(1)상에 기록된 정보 독취용으로 구성된 것을 특징으로 하는 광픽업 장치.
  6. 제5항에 있어서, 상기 전기적 신호들의 차이는 포토디텍터(5)(P1,P2,P3,P4)에 입사되는 레이저 빔의 크기변화에 의해 발생되도록 구성된 것을 특지으로 하는 광픽업 장치.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019920020835A 1992-11-06 1992-11-06 광픽업 장치 KR950005033B1 (ko)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR1019920020835A KR950005033B1 (ko) 1992-11-06 1992-11-06 광픽업 장치
US08/143,145 US5493425A (en) 1992-11-06 1993-10-29 Optical pickup apparatus having a quadrant hologram and a quadrant photo detector
GB9322484A GB2272323B (en) 1992-11-06 1993-11-01 Optical pickup system
JP5276657A JPH06223400A (ja) 1992-11-06 1993-11-05 光ピックアップ装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019920020835A KR950005033B1 (ko) 1992-11-06 1992-11-06 광픽업 장치

Publications (2)

Publication Number Publication Date
KR940012274A true KR940012274A (ko) 1994-06-23
KR950005033B1 KR950005033B1 (ko) 1995-05-17

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US (1) US5493425A (ko)
JP (1) JPH06223400A (ko)
KR (1) KR950005033B1 (ko)
GB (1) GB2272323B (ko)

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US5493425A (en) 1996-02-20
GB9322484D0 (en) 1993-12-22
GB2272323A (en) 1994-05-11
GB2272323B (en) 1997-01-22
JPH06223400A (ja) 1994-08-12
KR950005033B1 (ko) 1995-05-17

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