KR900018927A - 광픽업 - Google Patents

광픽업 Download PDF

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Publication number
KR900018927A
KR900018927A KR1019890006626A KR890006626A KR900018927A KR 900018927 A KR900018927 A KR 900018927A KR 1019890006626 A KR1019890006626 A KR 1019890006626A KR 890006626 A KR890006626 A KR 890006626A KR 900018927 A KR900018927 A KR 900018927A
Authority
KR
South Korea
Prior art keywords
beam splitter
light receiving
optical pickup
receiving element
astigmatism
Prior art date
Application number
KR1019890006626A
Other languages
English (en)
Other versions
KR0137218B1 (ko
Inventor
이구오 가스가
Original Assignee
야마다 로꾸이찌
가부시기가이샤 산교 세이기세이사꾸쇼
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 야마다 로꾸이찌, 가부시기가이샤 산교 세이기세이사꾸쇼 filed Critical 야마다 로꾸이찌
Publication of KR900018927A publication Critical patent/KR900018927A/ko
Application granted granted Critical
Publication of KR0137218B1 publication Critical patent/KR0137218B1/ko

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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
    • G11B7/1398—Means for shaping the cross-section of the beam, e.g. into circular or elliptical cross-section
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • 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

Landscapes

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

Abstract

내용 없음

Description

광픽업
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제1도는 본 발명에 따른 광픽업의 실시예를 도시한 광학 배치도.
제2도는 상기 실시예중 대물렌즈를 포함한 부분의 광학 배치도.
제3도는 상기 실시예중 보정렌즈의 전후에서 광속상태를 개념적으로 도시한 단면도.

Claims (6)

  1. 물체(6)와 수광소자(8) 사이에 평행 평판형 빔스플리터(3)를 배치하고, 이 빔스플리터(3)를 개재하여 광원(1)에서의 광빔을 물체(6)에 조사하여 빔스플리터(3)를 투과한 물체에서의 반사광을 수광소자(8)에 인도하게한 광픽업에 있어서, 상기 평행 평판형 빔스플리터(3)와 수광소자(8) 사이에 이 방성곡율면을 가진 보정렌즈(7)를 배치하고, 이 방상곡율면은 광빔이 빔스플리터(3)를 투과하는 것에 의해 발생하는 비점수차를 없애는 동시에 새로운 다른 방향에 임의 크기의 비점수차를 발생시키도록 형성되어 있는 것을 특징으로 하는 광픽업.
  2. 제1항에 있어서, 보정렌즈(7)를 단일렌즈로 한 것을 특징으로 하는 광픽업.
  3. 제1항에 있어서, 보정렌즈(7)의 평행 평판형 빔스플리터(3)측의 이방성 곡율면(R1)을 평행 평판형 빔스플리터(3)를 투과하는 것에 의해 발생한 비점수차를 없게하는 방향에 비점수차를 발생시키는 원환체면 또는 원주면으로 한 것을 특징으로 하는 광픽업.
  4. 제1항에 있어서, 보정렌즈(7)의 수광소자(8)측의 이방성곡율면(R2)을 임의방향에 비점수차를 발생시키는 동시에 수광소자면상의 결상배율을 소정의 값으로 하기 위한 원환 체면 또는 환상면으로 한 것을 특징으로 하는 광픽업.
  5. 제3항에 있어서, 보정렌즈(7)의 수광수자(8)측의 이방성곡율면(R2)에 의한 비점수차의 발생방향을 보정렌즈(7)의 평행 평판형 빔스플리터(3)측의 이방성곡율면(R1)에 의한 비점수차의 발생방향에 대하여 대략 45도 경사 되도록 한 것을 특징으로 하는 광픽업.
  6. 제1항에 있어서, 물체(6)와 평행 평판형 빔스플리터(3)사이에 전반사경(4)을 배치하고, 광디스크면과 평행한 평행 평판형 빔스플리터(3) 또는 수광소자(8)를 포함한 광축(X-X)을 직각방향으로 굴절시켜 광축(Z-Z)을 형성한 것을 특징으로 하는 광픽업.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019890006626A 1988-05-31 1989-05-18 광픽업 KR0137218B1 (ko)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP63-133230 1988-05-31
JP63133230A JPH0677332B2 (ja) 1988-05-31 1988-05-31 光ピックアップ

Publications (2)

Publication Number Publication Date
KR900018927A true KR900018927A (ko) 1990-12-22
KR0137218B1 KR0137218B1 (ko) 1998-04-24

Family

ID=15099767

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019890006626A KR0137218B1 (ko) 1988-05-31 1989-05-18 광픽업

Country Status (4)

Country Link
US (1) US4968874A (ko)
JP (1) JPH0677332B2 (ko)
KR (1) KR0137218B1 (ko)
DE (1) DE3917725C2 (ko)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5140608A (en) * 1991-05-29 1992-08-18 Optrotech Ltd, Israel Company Optical system for focusing a light beam on to an image plane
JPH0619125U (ja) * 1992-07-25 1994-03-11 株式会社三協精機製作所 光ピックアップ装置
JP3019902B2 (ja) * 1992-10-26 2000-03-15 松下電器産業株式会社 焦点誤差検出素子とそれを用いた光ヘッド
JPH07140381A (ja) * 1993-11-18 1995-06-02 Sony Corp コマ収差補正方法
JP3104780B2 (ja) * 1994-12-21 2000-10-30 松下電器産業株式会社 対物レンズ及びそれを用いた光ヘッド装置
JPH08327964A (ja) * 1995-06-02 1996-12-13 Matsushita Electric Ind Co Ltd 投写型画像表示装置
KR100238077B1 (ko) * 1997-01-28 2000-01-15 윤종용 평판을 사용하여 cd-r디스크에 호환하는 dvd디스크의 광픽업
US6195315B1 (en) * 1997-07-11 2001-02-27 Ricoh Company, Ltd. Optical disk apparatus compatible with different types of mediums
US20010050892A1 (en) * 1997-07-11 2001-12-13 Yoshitaka Takahashi Optical disk apparatus compatible with different types of mediums
US7215605B2 (en) * 2001-06-29 2007-05-08 Koninklijke Philips Electronics N.V. Optical scanning device with coma correction for improved focus tracking signal
EP1440347B1 (en) * 2001-10-16 2007-01-03 Koninklijke Philips Electronics N.V. Optical scanning device
US7477392B2 (en) * 2005-07-27 2009-01-13 Key Technology, Inc Electromagnetic energy measurement apparatus and method
JP2008251114A (ja) * 2007-03-30 2008-10-16 Nidec Sankyo Corp 光ヘッド装置
WO2008139715A1 (ja) * 2007-05-08 2008-11-20 Panasonic Corporation 光学ヘッド、光ディスク装置、コンピュータ、光ディスクプレーヤ及び光ディスクレコーダ
JP5121762B2 (ja) * 2009-03-19 2013-01-16 株式会社日立メディアエレクトロニクス 光ピックアップ

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4079247A (en) * 1975-05-16 1978-03-14 Claude Bricot Optical focussing device
US4412723A (en) * 1981-05-28 1983-11-01 The Perkin-Elmer Corporation Optical system for correcting the aberrations of a beamsplitter in converging light
JPS5897730U (ja) * 1981-12-24 1983-07-02 ヤマハ株式会社 光学式情報記録再生装置における自動焦点装置
JPS6095733A (ja) * 1983-10-31 1985-05-29 Hitachi Ltd 光学的信号処理装置
US4724533A (en) * 1984-06-15 1988-02-09 Matsushita Electric Industrial Co., Ltd. Optical head
JPS61236035A (ja) * 1985-04-09 1986-10-21 Sony Corp 光学ヘツド
JPS629537A (ja) * 1985-07-08 1987-01-17 Pioneer Electronic Corp 光学式ピツクアツプ装置
JPS6310326A (ja) * 1986-07-01 1988-01-16 Sanyo Electric Co Ltd 光ピツクアツプ装置
CA1319194C (en) * 1986-07-28 1993-06-15 Hideaki Satou Focusing error detector and optical data detecting device incorporating the focusing error detector
US4891799A (en) * 1987-03-13 1990-01-02 Fuji Electrochemical Co., Ltd. Optical head apparatus for writing and reading data on an optical disk having a lens with an inclined optical axis

Also Published As

Publication number Publication date
DE3917725C2 (de) 2000-11-30
JPH0677332B2 (ja) 1994-09-28
DE3917725A1 (de) 1989-12-21
US4968874A (en) 1990-11-06
KR0137218B1 (ko) 1998-04-24
JPH01302548A (ja) 1989-12-06

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