KR19990049997A - 광조절 반사형 듀얼 포커스 광픽업장치 - Google Patents

광조절 반사형 듀얼 포커스 광픽업장치 Download PDF

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Publication number
KR19990049997A
KR19990049997A KR1019970069019A KR19970069019A KR19990049997A KR 19990049997 A KR19990049997 A KR 19990049997A KR 1019970069019 A KR1019970069019 A KR 1019970069019A KR 19970069019 A KR19970069019 A KR 19970069019A KR 19990049997 A KR19990049997 A KR 19990049997A
Authority
KR
South Korea
Prior art keywords
light
laser light
liquid crystal
laser
light control
Prior art date
Application number
KR1019970069019A
Other languages
English (en)
Korean (ko)
Inventor
최양오
Original Assignee
전주범
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 전주범, 대우전자 주식회사 filed Critical 전주범
Priority to KR1019970069019A priority Critical patent/KR19990049997A/ko
Priority to FR9815826A priority patent/FR2772506A1/fr
Priority to NL1010825A priority patent/NL1010825A1/nl
Priority to CN98125221A priority patent/CN1220451A/zh
Publication of KR19990049997A publication Critical patent/KR19990049997A/ko

Links

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
    • G11B7/139—Numerical aperture control means
    • 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
    • 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
    • G11B7/1353—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
    • G11B7/135—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
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optical Head (AREA)
KR1019970069019A 1997-12-16 1997-12-16 광조절 반사형 듀얼 포커스 광픽업장치 KR19990049997A (ko)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR1019970069019A KR19990049997A (ko) 1997-12-16 1997-12-16 광조절 반사형 듀얼 포커스 광픽업장치
FR9815826A FR2772506A1 (fr) 1997-12-16 1998-12-15 Systeme de lecture optique compact pour une utilisation avec des disques optiques d'epaisseurs differentes
NL1010825A NL1010825A1 (nl) 1997-12-16 1998-12-16 Optisch opneemstelsel met compacte afmetingen voor gebruik met opische schijven van verschillende dikten.
CN98125221A CN1220451A (zh) 1997-12-16 1998-12-16 用于不同厚度的光盘的小尺寸光学拾取系统

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019970069019A KR19990049997A (ko) 1997-12-16 1997-12-16 광조절 반사형 듀얼 포커스 광픽업장치

Publications (1)

Publication Number Publication Date
KR19990049997A true KR19990049997A (ko) 1999-07-05

Family

ID=19527394

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019970069019A KR19990049997A (ko) 1997-12-16 1997-12-16 광조절 반사형 듀얼 포커스 광픽업장치

Country Status (4)

Country Link
KR (1) KR19990049997A (fr)
CN (1) CN1220451A (fr)
FR (1) FR2772506A1 (fr)
NL (1) NL1010825A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5331622A (en) * 1991-05-28 1994-07-19 Applied Magnetics Corporation Compact optical head
US6026065A (en) * 1995-03-04 2000-02-15 Lg Electronics Inc. Optical pick-up apparatus capable of reading data irrespective of disc type
JP2725632B2 (ja) * 1995-05-24 1998-03-11 日本電気株式会社 光ヘッド装置
JP3476989B2 (ja) * 1995-08-04 2003-12-10 パイオニア株式会社 光ピックアップ
EP0762398B1 (fr) * 1995-08-31 2003-05-07 SANYO ELECTRIC Co., Ltd. Appareil d'enregistrement/de reproduction pour disque optique pour l'enregistrement/la reproduction d'information sur disques optiques de types différents
US5659533A (en) * 1996-07-23 1997-08-19 Sampo Corporation Method of using a single pick-up head to read and store data on discs of different thicknesses and structure of a pick-up head apparatus therefor

Also Published As

Publication number Publication date
FR2772506A1 (fr) 1999-06-18
CN1220451A (zh) 1999-06-23
NL1010825A1 (nl) 1999-06-17

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