KR980004452A - Optical pickup device - Google Patents

Optical pickup device Download PDF

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Publication number
KR980004452A
KR980004452A KR1019960021846A KR19960021846A KR980004452A KR 980004452 A KR980004452 A KR 980004452A KR 1019960021846 A KR1019960021846 A KR 1019960021846A KR 19960021846 A KR19960021846 A KR 19960021846A KR 980004452 A KR980004452 A KR 980004452A
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KR
South Korea
Prior art keywords
light
recording medium
optical path
photodetector
converting means
Prior art date
Application number
KR1019960021846A
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Korean (ko)
Other versions
KR100207685B1 (en
Inventor
조건호
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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Publication date
Application filed by 김광호, 삼성전자 주식회사 filed Critical 김광호
Priority to KR1019960021846A priority Critical patent/KR100207685B1/en
Publication of KR980004452A publication Critical patent/KR980004452A/en
Application granted granted Critical
Publication of KR100207685B1 publication Critical patent/KR100207685B1/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
    • G11B7/13—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

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

트랙사이의 간격이 다른 기록매체를 채용할수 있도록 된 광픽업장치에 관한 것이다.The present invention relates to an optical pickup apparatus capable of employing recording media having different intervals between tracks.

이 광픽업장치는 광원과; 이 광원과 기록매체 사이의 광경로 상에 배치되어 광원에서 출사된 광을 0차광,±1차광,±2차광,.....으로 회절 투과시키는 그레이팅과; 입사되는 광의 입사방향에 따라 그 진행경로를 변환하는 광경로변환수단과; 광경로변환수단과 기록매체 사이의 광경로상에 배치되어 기록매체의 기록면에 광스폿이 형성되도록 입사광을 집속하는 대물렌즈와;기록매체에서 반사되고 광경로변환수단을 경유한 광을 수광하여 정보신호 및 오차신호를 검출하는 광검출기를 포함하며, 광검출기는 기록매체에서 반사된 광중 0차광을 수광하는 제1광검출기와; 제1광검출기를 중심으로 서로 대향되게 배치되며, 기록매체에서 반사된 광중+1차광과 -1차광을 각각 수광하여 상대적으로 트랙 간격이 작은 기록매체의 트랙오차신호를 검출하는 제2및 제3광검출기와; 제1광검출기와, 제2및 제3광검출기를 사이에 두고 대향되게 배치되어 기록매체에서 반사된 광중 +2차광과 -2차광을 각각 수광하여 상대적으로 트랙간격이 큰 기록매체의 트랙오차신호를 검출하는 제4및 제5광검출기를 포함하여 된 것을 특징으로 한다.The optical pickup apparatus includes a light source; A grating disposed on an optical path between the light source and the recording medium to diffract and transmit light emitted from the light source to 0th order light, ± 1st order light, ± 2nd order light, ....; Optical path converting means for converting the traveling path according to the incident direction of the incident light; An objective lens disposed on an optical path between the optical path converting means and the recording medium and focusing incident light to form a light spot on the recording surface of the recording medium; receiving information reflected from the recording medium and passing through the optical path converting means. A photodetector for detecting a signal and an error signal, the photodetector comprising: a first photodetector for receiving zero-order light of light reflected from a recording medium; A second and a third detector disposed to face each other with respect to the first photodetector and receiving the +1 order beam and the -1 order beam of light reflected from the recording medium to detect track error signals of the recording medium having a relatively small track interval; Photodetectors; A track error signal of a recording medium having a relatively large track interval by receiving the first photodetector and the second and third photodetectors opposed to each other and receiving +2 and -2 orders of light reflected from the recording medium, respectively. It characterized in that it comprises a fourth and a fifth photodetectors for detecting the.

Description

광픽업장치Optical pickup device

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

제4도는 본발명에 따른 광픽업장치의 광학적 배치를 보인 개략적인 구성도.Figure 4 is a schematic configuration showing an optical arrangement of the optical pickup device according to the present invention.

제5도는 제4도의 광검출기를 나타낸 개략도.5 is a schematic diagram showing the photodetector of FIG.

Claims (3)

광원과; 이 광원과 기록매체 사이의 광경로 상에 배치되어 상기 광원에서 출사된 광을 0차광,±1차광,±2차광,.....으로 회절 투과시키는 그레이팅과; 입사되는 광의 입사방향에 따라 그 진행경로를 변환하는 광경로변환수단과; 상기 광경로변환수단과 상기 기록매체 사이의 광경로 상에 배치되어 기록매체의 기록면에 광스폿이 형성되도록 입사광을 집속하는 대물렌즈와, 상기 기록매체에서 반사되고 광경로변환수단을 경유한 광을 수광하여 정보신호 및 오차신호를 검출하는 광검출기를 포함하여 된 광픽업장치에 있어서, 상기 광검출기는 상기 기록매체에서 반사된 광중 0차광을 수광하는 제1광검출기와; 상기 제1광검A light source; A grating disposed on an optical path between the light source and the recording medium to diffract and transmit the light emitted from the light source to 0th order light, ± 1st order light, ± 2nd order light,. Optical path converting means for converting the traveling path according to the incident direction of the incident light; An objective lens disposed on an optical path between the optical path converting means and the recording medium to focus incident light to form a light spot on a recording surface of the recording medium, and to reflect light from the recording medium and pass through the optical path converting means. An optical pickup apparatus comprising a photodetector for receiving an information signal and an error signal, wherein the photodetector comprises: a first photodetector for receiving zero-order light out of light reflected from the recording medium; The first light sword 제1항에 있어서, 상기 제1광검출기는 네 개의 분할판으로 이루어져 합산및 차동에 의해 정보신호(RF)및 포커스 오차신호를 검출하고,상기 제2 및 제3광검출기는 그 각각에서 검출된 신호의 차동에 의해 상기 기록매체로 디지털 비데오 디스크를 채용한 경우, 트랙오차신호를 검출하고, 상기 제4 및 제5광검출기는 그 각각에서 검출된 신호의 차동에 의해 상기 기록매체로 컴팩트 디스크를 채용한 경우, 트랙오차신호를 검출하는것을 특징으로 하는 광픽업장치.The optical detector of claim 1, wherein the first photodetector comprises four partition plates to detect an information signal RF and a focus error signal by summing and differential, and the second and third photodetectors are detected at each of the first and second photodetectors. When a digital video disk is employed as the recording medium by differential signal, a track error signal is detected, and the fourth and fifth photodetectors select a compact disk into the recording medium by differential of the signals detected thereon. And an optical pickup apparatus for detecting a track error signal. 제1항또는 제2항에 있어서, 상기 광경로변환수단과, 광검출기 사이의 광경로 상에 실린드리켈렌즈가 더 구비된 것을 특징으로 하는 광픽업장치.The optical pickup apparatus of claim 1 or 2, further comprising a cylinder lens on the optical path between the optical path converting means and the photodetector. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019960021846A 1996-06-17 1996-06-17 Optical pickup device KR100207685B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019960021846A KR100207685B1 (en) 1996-06-17 1996-06-17 Optical pickup device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019960021846A KR100207685B1 (en) 1996-06-17 1996-06-17 Optical pickup device

Publications (2)

Publication Number Publication Date
KR980004452A true KR980004452A (en) 1998-03-30
KR100207685B1 KR100207685B1 (en) 1999-07-15

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Application Number Title Priority Date Filing Date
KR1019960021846A KR100207685B1 (en) 1996-06-17 1996-06-17 Optical pickup device

Country Status (1)

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KR100207685B1 (en) 1999-07-15

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