KR950034115A - 광 픽업 - Google Patents

광 픽업 Download PDF

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Publication number
KR950034115A
KR950034115A KR1019940010430A KR19940010430A KR950034115A KR 950034115 A KR950034115 A KR 950034115A KR 1019940010430 A KR1019940010430 A KR 1019940010430A KR 19940010430 A KR19940010430 A KR 19940010430A KR 950034115 A KR950034115 A KR 950034115A
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KR
South Korea
Prior art keywords
photodiode
hologram element
focusing
beam splitter
laser diode
Prior art date
Application number
KR1019940010430A
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English (en)
Other versions
KR0171076B1 (ko
Inventor
최양오
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 KR1019940010430A priority Critical patent/KR0171076B1/ko
Priority to JP7139907A priority patent/JP2854264B2/ja
Priority to US08/440,798 priority patent/US5636190A/en
Publication of KR950034115A publication Critical patent/KR950034115A/ko
Application granted granted Critical
Publication of KR0171076B1 publication Critical patent/KR0171076B1/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
    • G11B7/13—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
    • G11B7/08—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
    • G11B7/08—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
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/127—Lasers; Multiple laser arrays
    • 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • G11B7/24035—Recording layers
    • G11B7/24038—Multiple laminated recording layers
    • 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
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
    • G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers
    • 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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms
    • 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

Abstract

본 발명은 광 픽업을 개시한다. 본 발명은, 빔 스프리터; 포커싱 신호만을 검출하는 포토 다이오드를 갖는 제1홀로그램 소자; 포커싱과 트랙킹 신호를 검출하는 포토 다이오드를 갖는 제2홀로그램 소자; 상기 빔 스프리터에 의해 반사된 서로 다른 파장의 레이저 빔을 광 디스크에 집속시키는 집속수단; 을 포함하여 하나의 몸체에 복수개의 기록층이 형성된 광 디스크의 각 기록층에 각각 기록/재생을 행하도록 된것으로서, 서로 다른 2가지 이상의 파장을 가지는 레이저 빔을 제1, 2홀로그램 소자를 통해 선택적으로 발생 시킬 수 있는 것이어서, 한몸체에 복수의 기록층을 가지고 있는 광 디스크에 용이하게 기록/재생을 행할 수 있는 것은 물론이고, 특히 트랙이 마련되어 있지 않은 어느 하나의 기록층을 통해 포커스 신호만을 용이하게 검출할 수 있는 이점이 있다.

Description

광 픽업
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제3도는 본 발명에 따른 광 픽업의 개략도, 제4도는 (가),(나),(다)는 제1, 2홀로그램 소자에 사용되는 포토다이오드를 도시한 개략도.

Claims (4)

  1. 빔 스프리터; 상기 빔 스프리터의 어느 일측면과 대면하도록 설치되고, 소정파장의 레이저 빔을 발생하는 레이저 다이오드와, 이 레이저 다이오드로부터 발생된 빔을 빔 스프리터를 향해 주사하는 회절격자, 그리고 포커싱 신호만을 검출하는 포토 다이오드를 갖는 제1홀로그램 소자; 상기 제1홀로그램 소자와 수직방향에 위치되어 빔 스프리터의 타측면과 대면하며, 소장파장의 레이저 빔을 발생하는 레이저 다이오드와, 이 레이저 다이오드로부터 발생된 빔을 분할하는 홀로그램 패턴이 형성된 홀로그램과, 포커싱과 트랙킹 신호를 검출하는 포토 다이오드를 갖는 제2홀로그램 소자; 상기 빔 스프리터에 의해 반사된 서로 다른 파장의 레이저 빔을 광디스크에 집속시키는 집속수단; 을 포함하여 하나의 몸체에 복수개의 기록층이 형성된 광 디스크의 각 기록층에 각각 기록/재생을 행하도록 된 것을 특징으로 하는 광 픽업.
  2. 제1항에 있어서, 상기 제1홀로그램 소자의 포토 다이오드가, 단일 포토 다이오드인 것을 특징으로 하는 광 픽업.
  3. 제1항에 있어서, 상기 제1홀로그램 소자의 포토 다이오드가, 2분할 포토 다이오드인 것을 특징으로 하는 광 픽업.
  4. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019940010430A 1994-05-13 1994-05-13 서로 다른 파장의 레이저 비임을 동시에 각각 발생하여 한쪽면에 복수개의 기록층을 가지는 광디스크를 기록/재생하는 광 픽업 시스템 KR0171076B1 (ko)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1019940010430A KR0171076B1 (ko) 1994-05-13 1994-05-13 서로 다른 파장의 레이저 비임을 동시에 각각 발생하여 한쪽면에 복수개의 기록층을 가지는 광디스크를 기록/재생하는 광 픽업 시스템
JP7139907A JP2854264B2 (ja) 1994-05-13 1995-05-15 光ピックアップシステム
US08/440,798 US5636190A (en) 1994-05-13 1995-05-15 Optical pickup system for use with an optical disk having multiple reflection hologram film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019940010430A KR0171076B1 (ko) 1994-05-13 1994-05-13 서로 다른 파장의 레이저 비임을 동시에 각각 발생하여 한쪽면에 복수개의 기록층을 가지는 광디스크를 기록/재생하는 광 픽업 시스템

Publications (2)

Publication Number Publication Date
KR950034115A true KR950034115A (ko) 1995-12-26
KR0171076B1 KR0171076B1 (ko) 1999-04-15

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ID=19382975

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Application Number Title Priority Date Filing Date
KR1019940010430A KR0171076B1 (ko) 1994-05-13 1994-05-13 서로 다른 파장의 레이저 비임을 동시에 각각 발생하여 한쪽면에 복수개의 기록층을 가지는 광디스크를 기록/재생하는 광 픽업 시스템

Country Status (3)

Country Link
US (1) US5636190A (ko)
JP (1) JP2854264B2 (ko)
KR (1) KR0171076B1 (ko)

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Also Published As

Publication number Publication date
JP2854264B2 (ja) 1999-02-03
JPH07311973A (ja) 1995-11-28
KR0171076B1 (ko) 1999-04-15
US5636190A (en) 1997-06-03

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