KR960038788A - Optical pickup - Google Patents

Optical pickup Download PDF

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Publication number
KR960038788A
KR960038788A KR1019950009328A KR19950009328A KR960038788A KR 960038788 A KR960038788 A KR 960038788A KR 1019950009328 A KR1019950009328 A KR 1019950009328A KR 19950009328 A KR19950009328 A KR 19950009328A KR 960038788 A KR960038788 A KR 960038788A
Authority
KR
South Korea
Prior art keywords
optical
optical pickup
quarter
objective lens
optical disk
Prior art date
Application number
KR1019950009328A
Other languages
Korean (ko)
Other versions
KR100234306B1 (en
Inventor
유장훈
이철우
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.)
Filing date
Publication date
Application filed by 김광호, 삼성전자 주식회사 filed Critical 김광호
Priority to KR1019950009328A priority Critical patent/KR100234306B1/en
Publication of KR960038788A publication Critical patent/KR960038788A/en
Application granted granted Critical
Publication of KR100234306B1 publication Critical patent/KR100234306B1/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
    • 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

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)

Abstract

본 발명은 광기록매체의 기록면에 조사되는 광스폿의 유효크기를 작게 할 수 있는 광픽업에 관한 것으로, 특히 광축방향이 서로 다른 파장판을 사용하여 선편광된 스폿의 크기를 중이는 광픽업에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup capable of reducing the effective size of an optical spot irradiated onto a recording surface of an optical recording medium, and more particularly, to an optical pickup in which the size of a linearly polarized spot using a wavelength plate having different optical axis directions is used. will be.

본 발명에 의한 광픽업은 광원과, 이 광원에서 발생된 광을 광디스크에 집속하는 대물렌즈와, 광디스크의 반사광으로부터 신호를 검출하는 광검출기를 구비한 광픽업에 있어서, 직경과 광축방향이 서로다른 복수개의 1/4파장판을 광디스크에 입사되는 광중심에 맞추어 대물렌즈의 하부에 장착한 것을 특징으로 한다.In the optical pickup according to the present invention, an optical pickup including a light source, an objective lens for focusing light generated by the light source on an optical disk, and an optical detector for detecting a signal from reflected light of the optical disk, the optical pickup having different diameters and optical axis directions. A plurality of quarter-wave plate is mounted on the lower portion of the objective lens in accordance with the optical center incident on the optical disk.

따라서, 본 바명에 의한 광픽업은 광축방향이 서로 다른 1/4파장판을 사용하여 스폿이 갖고 있는 편광성분을 분리하여 스폿 선형편광성분의 크기를 줄이고, 제1회절광을 감소시킴으로서 재생신호의 해상도를 증가시키는 효과가 있다.Therefore, the optical pickup according to the present invention uses a quarter-wave plate having different optical axis directions to separate the polarization components of the spot, thereby reducing the size of the spot linearly polarized components and reducing the first diffraction light, This has the effect of increasing the resolution.

Description

광픽업Optical pickup

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제2도는 본 발명에 따른 광촉방행이 서로 다른 파장판을 사용하여 스폿의 선형편광성분의 크기를 조절하는 광픽업을 나타낸 개략도, 제6A도에서 제2도에 도시된 서로 다른 광축방향을 갖는 파장판의 실시예를 보인 도면.FIG. 2 is a schematic view showing an optical pickup for controlling the size of a linear polarization component of a spot using different wavelength plates of photocatalyst according to the present invention, and wavelengths having different optical axis directions shown in FIG. 6A to FIG. Figure showing an embodiment of the plate.

Claims (4)

광원과, 이광원에서 발생된 광을 광디스크에 집속하는 대물렌즈와, 광디스크의 반사광으로부터 신호를 검출하는 광검출기를 구비한 광픽업에 있어서, 직경과 광축방향이 서로 다른 복수개의 1/4파장판을 광디스크에 입사되는 광중심에 맞추어 대물렌즈의 하부에 장착한 것을 특징으로 하는 광픽업.In an optical pickup having a light source, an objective lens for focusing light generated from two light sources on an optical disk, and an optical detector for detecting a signal from reflected light of the optical disk, a plurality of quarter wave plates having different diameters and optical axis directions are provided. An optical pickup comprising a lower portion of an objective lens in accordance with an optical center incident on an optical disk. 광원과, 이 광원에서 발생된 광을 광디스크에 집속하는 대물렌즈와, 광디스크에 반사광으로부터 신호를 검출하는 광검출기를 구비한 광픽업에 있어서, 직경과 광축방향이 서로 다른 링(Ring)형태의 복수개의 1/4파장판을 광디스크에입사되는 광중심에 맞추어 대물렌즈의 하부에 장착한 것을 특징으로 하는 광픽업.An optical pickup comprising a light source, an objective lens for focusing light generated by the light source on an optical disk, and an optical detector for detecting a signal from reflected light on the optical disk, the optical pickup having a plurality of ring-shaped rings having different diameters and optical axis directions. Optical pickup comprising four quarter-wave plates mounted below the objective lens in accordance with the optical center incident on the optical disk. 제1항 또는 제2항에 있어서, 복수개의 1/4파장판은 동심원이 되도록 하여 장착한 것을 특징으로 하는 광픽업.The optical pickup according to claim 1 or 2, wherein the plurality of quarter-wave plates are mounted so as to be concentric. 제1항 또는 제2항에 있어서, 복수개의 1/4파장판의 효과를 1개의 복굴절판에 단차를 생성기켜 사용하는 광픽업.The optical pickup according to claim 1 or 2, wherein the effects of the plurality of quarter-wave plates are used to generate a step in one birefringent plate. ※ 참고사항 : 최초출원 내용에 의하여 공개되는 것임.※ Note: This is to be disclosed by the original application.
KR1019950009328A 1995-04-20 1995-04-20 An optical pickup KR100234306B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019950009328A KR100234306B1 (en) 1995-04-20 1995-04-20 An optical pickup

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950009328A KR100234306B1 (en) 1995-04-20 1995-04-20 An optical pickup

Publications (2)

Publication Number Publication Date
KR960038788A true KR960038788A (en) 1996-11-21
KR100234306B1 KR100234306B1 (en) 1999-12-15

Family

ID=19412580

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019950009328A KR100234306B1 (en) 1995-04-20 1995-04-20 An optical pickup

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KR (1) KR100234306B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100467070B1 (en) * 1997-07-19 2005-04-08 엘지전자 주식회사 Optical pickup device with adjustable distance on the optical axis

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0696466A (en) * 1992-09-14 1994-04-08 Fuji Xerox Co Ltd Optical pickup device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100467070B1 (en) * 1997-07-19 2005-04-08 엘지전자 주식회사 Optical pickup device with adjustable distance on the optical axis

Also Published As

Publication number Publication date
KR100234306B1 (en) 1999-12-15

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