KR970076588A - Optical pickup device for both recording and reproduction - Google Patents

Optical pickup device for both recording and reproduction Download PDF

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Publication number
KR970076588A
KR970076588A KR1019960015056A KR19960015056A KR970076588A KR 970076588 A KR970076588 A KR 970076588A KR 1019960015056 A KR1019960015056 A KR 1019960015056A KR 19960015056 A KR19960015056 A KR 19960015056A KR 970076588 A KR970076588 A KR 970076588A
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KR
South Korea
Prior art keywords
light
optical path
incident
recording
polarized light
Prior art date
Application number
KR1019960015056A
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Korean (ko)
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KR100207677B1 (en
Inventor
성평용
Original Assignee
김광호
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.)
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Priority to KR1019960015056A priority Critical patent/KR100207677B1/en
Publication of KR970076588A publication Critical patent/KR970076588A/en
Application granted granted Critical
Publication of KR100207677B1 publication Critical patent/KR100207677B1/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
    • G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
    • G11B7/1369—Active plates, e.g. liquid crystal panels or electrostrictive elements
    • 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
    • G11B7/1372—Lenses
    • G11B7/1374—Objective lenses
    • 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
    • G11B7/1372—Lenses
    • G11B7/1378—Separate aberration correction lenses; Cylindrical lenses to generate astigmatism; Beam expanders
    • 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

Abstract

기록 재생 겸용 광픽업장치가 개시되어 있다.There is disclosed an optical pickup apparatus for both recording and reproduction.

이 개시된 광픽업장치는 광원과 ; 입사광을 투과 및/또는 반사시켜 입사광의 진행경로를 변환하는 광경로변환 수단과 ; 광경로변환수단과 기록매체 사이에 위치되어 기록매체에 광스폿이 형성되도록 입사광을 수렴시키는 대물렌즈와; 광경로변환수단과 대물렌즈 사이의 광경로 상에 위치되어 투과되는 광의 편광상태를 변환하는 평광변환수단과 ; 기록매체에서 반사된 광을 수광하여 오차신호 및 정보신호를 검출하는 광검출기를 구비하여 된 것을 특징으로 한다. 여기서, 편광변환수단은 기록시 입사되는 직선편광의 광을 원편광을 비꾸어주고, 재생시 입사되는 직선편광의 광을 타원편광으로 바꾸어주도록 된 액정판과 이 액정판을 구동하는 구동부를 포함한다.The disclosed optical pick-up apparatus comprises: a light source; An optical path changing means for changing the traveling path of the incident light by transmitting and / or reflecting the incident light; An objective lens positioned between the optical path changing means and the recording medium for converging the incident light so as to form a light spot on the recording medium; A polarized light converting means for converting a polarized state of light transmitted through the optical path between the optical path changing means and the objective lens; And a photodetector for receiving the light reflected from the recording medium and detecting an error signal and an information signal. Here, the polarized light conversion means includes a liquid crystal plate for irradiating linearly polarized light incident upon recording with circularly polarized light, converting linearly polarized light incident upon reproduction into elliptically polarized light, and a driving unit for driving the liquid crystal plate .

따라서, 기록시와 재생시 광원에서 출사되는 광파워가 다르더라도 광검출기에 수광되는 광량은 동일 내지 유사하게 할 수 있다.Therefore, even if the optical powers emitted from the light sources during recording and during reproduction are different, the amounts of light received by the photodetector can be the same or similar.

Description

기록 재생 겸용 광픽업장치Optical pickup device for both recording and reproduction

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is a trivial issue, I did not include the contents of the text.

제2도는 본 발명에 따른 기록 재생 겸용 광픽업장치의 광학적 구성을 보인 개략도.FIG. 2 is a schematic view showing an optical configuration of a recording and reproducing optical pick-up apparatus according to the present invention; FIG.

Claims (7)

광원과 ; 입사광을 투과 및/또는 반사시켜 입사광의 진행경로를 변환하는 광경로변환 수단과 ; 상기 광경로변환수단과 기록매체 사이에 위치되어 기록매체에 광스폿이 형성되도록 입사광을 수렴시키는 대물렌즈와; 상기 광경로변환수단과 대물렌즈 사이의 광경로 상에 위치되어 투과되는 광의 편광상태를 변환하는 평광변환수단과 ; 상기 기록매체에서 반사된 광을 수광하여 오차신호 및 정보신호를 검출하는 광검출기를 구비하여 된 것을 특징으로 하는 기록 재생 겸용 광픽업장치.A light source; An optical path changing means for changing the traveling path of the incident light by transmitting and / or reflecting the incident light; An objective lens positioned between the optical path changing means and the recording medium for converging incident light so that a light spot is formed on the recording medium; A polarized light converting means for converting the polarized state of light that is positioned on the optical path between the optical path changing means and the objective lens and is transmitted; And a photodetector for detecting the error signal and the information signal by receiving the light reflected from the recording medium. 제1항에 있어서, 상기 복수의 액정판은 재생시 편광변환정도와, 기록 및 소거시 편광변화정도가 서로 다르도록 상기 구동부에 의해 구동되는 것을 특징으로 하는 기록 재생 겸용 광픽업장치.The optical pickup apparatus according to claim 1, wherein the plurality of liquid crystal plates are driven by the driving unit so that the degree of polarization conversion during reproduction and the degree of polarization change during recording and erasure are different from each other. 제2항에 있어서, 상기 액정판은 재생시 입사되는 직선편광의 관을 원편광의 광으로 바꾸어 주는 것을 특징으로 하는 기록 재생 겸용 광픽업장치.The optical pickup apparatus according to claim 2, wherein the liquid crystal plate converts the linearly polarized light incident upon the reproduction into circularly polarized light. 제2항에 있어서, 상기 액정판은 기록 및 소거시 입사되는 직선편광의 광을 타원편광의 광으로 바꾸어 주는 것을 특징으로 하는 기록 재생 겸용 광픽업장치.3. The optical pickup apparatus according to claim 2, wherein the liquid crystal plate converts linearly polarized light incident upon recording and erasing into elliptically polarized light. 제2항에 있어서, 상기 액정판을 통화한 광의 위상변화는 아래 식을 만족하는 것을 특징으로 하는 기록 재생 겸용 광픽업장치.3. The liquid crystal display according to claim 2, Satisfies the following expression. ≪ EMI ID = 17.0 > 여기서, Pr은 재생시 광원에서 출사되는 광출력이고, PW는 기록시 광원에서 출사되는 광출력.Where, Pr is the optical power of light emitted from the light source upon reproduction, P W is the light output of light emitted by the light source at the time of recording. 제1항 내지 제5항 중 어느 한 항에 있어서, 상기 광경로변환수단은 소정 편광의 입사광만을 투과시키도록된 편광빔스프티터인 것을 특징으로 하는 기록 재생 겸용 광픽업장치.The optical pickup device according to any one of claims 1 to 5, wherein the optical path changing means is a polarization beam splitter adapted to transmit only incident light of a predetermined polarized light. 제1항 내지 제5항 중 어느 한 항에 있어서, 상기 광경로변환수단과 상기 광검출기 사이의 광경로 상에 비점수차를 야기하는 비점수차렌즈가 더 구비된 것을 특징으로 하는 기록 재생 겸용 광픽업장치.The optical pickup according to any one of claims 1 to 5, further comprising an astigmatic lens for causing astigmatism on an optical path between the optical path changing means and the photodetector. Device. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: It is disclosed by the contents of the first application.
KR1019960015056A 1996-05-08 1996-05-08 Optical pickup device capable of recording and reproducing KR100207677B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019960015056A KR100207677B1 (en) 1996-05-08 1996-05-08 Optical pickup device capable of recording and reproducing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019960015056A KR100207677B1 (en) 1996-05-08 1996-05-08 Optical pickup device capable of recording and reproducing

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KR970076588A true KR970076588A (en) 1997-12-12
KR100207677B1 KR100207677B1 (en) 1999-07-15

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