KR950034116A - Optical pickup - Google Patents

Optical pickup Download PDF

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Publication number
KR950034116A
KR950034116A KR1019940010431A KR19940010431A KR950034116A KR 950034116 A KR950034116 A KR 950034116A KR 1019940010431 A KR1019940010431 A KR 1019940010431A KR 19940010431 A KR19940010431 A KR 19940010431A KR 950034116 A KR950034116 A KR 950034116A
Authority
KR
South Korea
Prior art keywords
hologram
photodiode
focusing
recording
laser
Prior art date
Application number
KR1019940010431A
Other languages
Korean (ko)
Other versions
KR0171078B1 (en
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.)
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Publication date
Application filed by 배순훈, 대우전자 주식회사 filed Critical 배순훈
Priority to KR1019940010431A priority Critical patent/KR0171078B1/en
Publication of KR950034116A publication Critical patent/KR950034116A/en
Application granted granted Critical
Publication of KR0171078B1 publication Critical patent/KR0171078B1/en

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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
    • G11B7/1353—Diffractive elements, e.g. holograms or gratings
    • 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
    • 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
    • G11B7/1395—Beam splitters or combiners
    • 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

Abstract

본 발명은 광 픽업을 개시한다. 본 발명은, 빔 스프리터; 포커싱 신호만을 검출하도록 홀로그램 패턴이 형성된 홀로그램과 포토 다이오드를 갖는 제1홀로그램 소자; 포커싱과 트랙킹 신호를 검출하도록 3분할 홀로그램 패턴과 홀로그램 패턴이 형성된 홀로그램과 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 된 것으로서, 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.The present invention discloses an optical pickup. The present invention, a beam splitter; A first hologram element having a hologram and a photo diode in which a hologram pattern is formed so as to detect only a focusing signal; A second hologram element having a hologram pattern and a hologram and a photodiode in which a three-part hologram pattern and a hologram pattern are formed to detect a focusing and tracking signal; Focusing means for focusing laser beams of different wavelengths reflected by the beam splitter onto an optical disk; In this case, recording / reproducing is performed on each recording layer of the optical disk in which a plurality of recording layers are formed in one body. It is possible to easily record / reproduce on an optical disk having a plurality of recording layers in one body, and in particular, only a focus signal can be easily provided through any recording layer without a track. There is an advantage that can be detected.

Description

광 픽업Optical pickup

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제3도는 본 발명에 따른 광 픽업의 개략도, 제4도는 (가),(나),(다)는 제1, 2홀로그램 소자에 사용되는 포토다이오드를 도시한 개략도.3 is a schematic diagram of an optical pickup according to the present invention, and FIG. 4 is (a), (b) and (c) diagrams showing photodiodes used in the first and second hologram elements.

Claims (4)

빔 스프리터; 상기 빔 스프리터의 어느 일측면과 대면하도록 설치되고, 소정파장의 레이저 빔을 발생하는 레이저 다이오드와, 이 레이저 다이오드로부터 발생된 빔을 회절 시키는 홀로그램 패턴이 그 상면에 형성된 홀로그램, 포커싱 신호만을 검출하는 포토 다이오드를 갖는 제1홀로그램 소자; 상기 제1홀로그램 소자와 수직방향에 위치되어 빔 스프리터의 타측면과 대면하며, 소장파장의 레이저 빔을 발생하는 레이저 다이오드와, 그 상, 하면에 레이저 빔을 회절시키고 3빔으로 분할하는 홀로그램 패턴과 3분할 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.Beam splitters; A photodiode provided to face one side of the beam splitter, the laser diode generating a laser beam having a predetermined wavelength, and the hologram pattern diffracting the beam generated from the laser diode, and the photo for detecting only the hologram and the focusing signal. A first hologram element having a diode; A laser diode positioned perpendicular to the first hologram element to face the other side of the beam splitter, the laser diode generating a small wavelength laser beam, and a hologram pattern diffracting the laser beam on and below the three beams; A second hologram element having a hologram in which a three-segment hologram pattern is formed and a photodiode for detecting a focusing and tracking signal; Focusing means for concentrating laser beams having different wavelengths reflected by the beam splitter onto an optical disk; And recording / reproducing on each recording layer of the optical disc having a plurality of recording layers formed in one body, respectively. 제1항에 있어서, 상기 제1홀로그램 소자의 포토 다이오드가, 단일 포토 다이오드인 것을 특징으로 하는 광 픽업.The optical pickup according to claim 1, wherein the photodiode of the first hologram element is a single photodiode. 제1항에 있어서, 상기 제1홀로그램 소자의 포토 다이오드가, 2분할 포토 다이오드인 것을 특징으로 하는 광 픽업.The optical pickup according to claim 1, wherein the photodiode of the first hologram element is a two-split photodiode. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940010431A 1994-05-13 1994-05-13 A recording and reproducing optical pickup system for the optical disk with plural recording layer in one side by generating successively different wavelength laser beam KR0171078B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019940010431A KR0171078B1 (en) 1994-05-13 1994-05-13 A recording and reproducing optical pickup system for the optical disk with plural recording layer in one side by generating successively different wavelength laser beam

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019940010431A KR0171078B1 (en) 1994-05-13 1994-05-13 A recording and reproducing optical pickup system for the optical disk with plural recording layer in one side by generating successively different wavelength laser beam

Publications (2)

Publication Number Publication Date
KR950034116A true KR950034116A (en) 1995-12-26
KR0171078B1 KR0171078B1 (en) 1999-04-15

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KR1019940010431A KR0171078B1 (en) 1994-05-13 1994-05-13 A recording and reproducing optical pickup system for the optical disk with plural recording layer in one side by generating successively different wavelength laser beam

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100224621B1 (en) * 1996-09-16 1999-10-15 윤종용 OPTICAL PICK UP FOR RECORD PLAYING TO COMkpoIBILITY BETWEEN OTHER DISKS
KR100234261B1 (en) * 1996-06-07 1999-12-15 윤종용 Compatible optical pickup device
KR100238069B1 (en) * 1996-10-31 2000-01-15 윤종용 Optical pickup compatible with cd-r and dvd using hologram
KR100260528B1 (en) * 1996-12-21 2000-07-01 구자홍 Optical pickup device for different type optical disk
KR100303053B1 (en) * 1996-12-16 2001-09-24 모리시타 요이찌 Optical pickup
KR100306984B1 (en) * 1996-10-01 2001-11-30 모리시타 요이찌 Optical pickup device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100234261B1 (en) * 1996-06-07 1999-12-15 윤종용 Compatible optical pickup device
KR100224621B1 (en) * 1996-09-16 1999-10-15 윤종용 OPTICAL PICK UP FOR RECORD PLAYING TO COMkpoIBILITY BETWEEN OTHER DISKS
KR100306984B1 (en) * 1996-10-01 2001-11-30 모리시타 요이찌 Optical pickup device
KR100238069B1 (en) * 1996-10-31 2000-01-15 윤종용 Optical pickup compatible with cd-r and dvd using hologram
KR100303053B1 (en) * 1996-12-16 2001-09-24 모리시타 요이찌 Optical pickup
KR100260528B1 (en) * 1996-12-21 2000-07-01 구자홍 Optical pickup device for different type optical disk

Also Published As

Publication number Publication date
KR0171078B1 (en) 1999-04-15

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