DE68925502D1 - Optische Kopfanordnung zum Lesen von in einem Aufzeichnungsmedium gespeicherten Informationen - Google Patents

Optische Kopfanordnung zum Lesen von in einem Aufzeichnungsmedium gespeicherten Informationen

Info

Publication number
DE68925502D1
DE68925502D1 DE68925502T DE68925502T DE68925502D1 DE 68925502 D1 DE68925502 D1 DE 68925502D1 DE 68925502 T DE68925502 T DE 68925502T DE 68925502 T DE68925502 T DE 68925502T DE 68925502 D1 DE68925502 D1 DE 68925502D1
Authority
DE
Germany
Prior art keywords
recording medium
information stored
head assembly
optical head
reading information
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Fee Related
Application number
DE68925502T
Other languages
English (en)
Other versions
DE68925502T2 (de
Inventor
Shigeki Tsuji
Taizo Yokota
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
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
Priority claimed from JP63193661A external-priority patent/JPH0677334B2/ja
Priority claimed from JP63193660A external-priority patent/JPH0677333B2/ja
Application filed by Sharp Corp filed Critical Sharp Corp
Publication of DE68925502D1 publication Critical patent/DE68925502D1/de
Application granted granted Critical
Publication of DE68925502T2 publication Critical patent/DE68925502T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
    • 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
    • G11B7/0901—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 for track following only
    • G11B7/0903—Multi-beam tracking systems
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
  • Optical Recording Or Reproduction (AREA)
DE68925502T 1988-08-02 1989-08-02 Optische Kopfanordnung zum Lesen von in einem Aufzeichnungsmedium gespeicherten Informationen Expired - Fee Related DE68925502T2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP63193661A JPH0677334B2 (ja) 1988-08-02 1988-08-02 光学式情報読取装置
JP63193660A JPH0677333B2 (ja) 1988-08-02 1988-08-02 光学式情報読取装置

Publications (2)

Publication Number Publication Date
DE68925502D1 true DE68925502D1 (de) 1996-03-07
DE68925502T2 DE68925502T2 (de) 1996-07-18

Family

ID=26508005

Family Applications (1)

Application Number Title Priority Date Filing Date
DE68925502T Expired - Fee Related DE68925502T2 (de) 1988-08-02 1989-08-02 Optische Kopfanordnung zum Lesen von in einem Aufzeichnungsmedium gespeicherten Informationen

Country Status (3)

Country Link
US (1) US4983017A (de)
EP (1) EP0354019B1 (de)
DE (1) DE68925502T2 (de)

Families Citing this family (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0758559B2 (ja) * 1988-09-02 1995-06-21 シャープ株式会社 光ピックアップ装置
EP0374841B1 (de) * 1988-12-20 1994-03-09 Nec Corporation Optischer Kopf zur optimalen Detektierung eines Fokusfehlers
US5283690A (en) * 1989-04-04 1994-02-01 Sharp Kabushiki Kaisha Optical diffraction grating element
DE69128808T2 (de) * 1990-04-12 1998-07-23 Matsushita Electric Ind Co Ltd Optischer Kopf mit hologrammverbundener Objektivlinse
US5202869A (en) * 1990-04-20 1993-04-13 Sharp Kabushiki Kaisha Optical head device including diffraction grating
JPH0721869B2 (ja) * 1990-04-20 1995-03-08 シャープ株式会社 光ピックアップ装置
JP3155287B2 (ja) * 1990-05-30 2001-04-09 株式会社リコー 光情報記録再生装置
JP2684822B2 (ja) * 1990-06-06 1997-12-03 松下電器産業株式会社 光ピックアップヘッド装置
JP3028854B2 (ja) * 1990-07-18 2000-04-04 セイコーエプソン株式会社 光ヘッド及び光記憶再生装置
NL9002007A (nl) * 1990-09-12 1992-04-01 Philips Nv Inrichting voor het met optische straling aftasten van een informatievlak.
JP2776487B2 (ja) * 1992-01-28 1998-07-16 シャープ株式会社 光学式情報記録再生装置
DE59409779D1 (de) * 1993-04-16 2001-07-19 Infineon Technologies Ag Diffraktive optische Einrichtung zur optischen Abbildung eines Raumpunktes auf andere Raumpunkte
US6185166B1 (en) 1993-06-21 2001-02-06 Fujitsu Limited Optical information recording/reproducing apparatus
US5742572A (en) * 1993-06-21 1998-04-21 Fujitsu Limited Optical information recording/reproducing apparatus which detects focal error
US5546156A (en) * 1994-02-25 1996-08-13 Eastman Kodak Company Camera with pointing aid
US5511059A (en) * 1994-06-14 1996-04-23 Eastman Kodak Company Multi-element grating beam splitter with a reflection grating element for use in front facet substraction
US5544143A (en) * 1994-06-14 1996-08-06 Eastman Kodak Company Read/write laser-detector-grating unit (LDGU) with an orthogonally-arranged focus and tracking sensor system
JPH0845107A (ja) * 1994-08-01 1996-02-16 Oki Electric Ind Co Ltd 光記録・再生装置および情報記録用の媒体
JPH08221789A (ja) * 1995-02-14 1996-08-30 Matsushita Electric Ind Co Ltd 光情報処理装置
US5523993A (en) * 1995-05-17 1996-06-04 Opto-Electronics & Systems Laboratories Holographic optical element for optical disk pickup head
US6829091B2 (en) * 1997-02-07 2004-12-07 Canon Kabushiki Kaisha Optical system and optical instrument with diffractive optical element
US5856961A (en) * 1997-06-24 1999-01-05 Eastman Kodak Company Laser detector grating unit (LDGU) for producing focus error, a push-pull tracking error, and differential phase tracking error signals
JPH11161973A (ja) * 1997-09-24 1999-06-18 Fujitsu Ltd 光学的情報記録／再生装置
KR100375514B1 (ko) * 1997-10-20 2003-11-28 삼성전기주식회사 광픽업장치
JPH11185279A (ja) * 1997-12-16 1999-07-09 Fujitsu Ltd 光学的情報記録／再生装置
KR100555478B1 (ko) * 1999-06-18 2006-03-03 삼성전자주식회사 안정된 오차신호 검출 가능한 광픽업장치
US6909687B2 (en) * 2000-03-29 2005-06-21 Sanyo Electric Co., Ltd. Optical pickup with a diffraction element consist of six regions providing spatial variation corresponding to a focas state
JP3456579B2 (ja) * 2000-04-20 2003-10-14 日本電気株式会社 光ヘッド装置および光学式情報記録再生装置
KR100403622B1 (ko) * 2001-04-12 2003-10-30 삼성전자주식회사 광픽업장치 및 광스폿의 최적 포커싱 방법
WO2003041066A1 (en) * 2001-11-09 2003-05-15 Sharp Kabushiki Kaisha Light integration unit, optical pickup device using the unit, and optical disk device
JP2005011478A (ja) * 2003-04-24 2005-01-13 Ricoh Co Ltd 回折格子とその作製方法及び複製方法並びにその回折格子を用いた光ヘッド装置及び光ディスクドライブ装置
US7304934B2 (en) * 2003-04-28 2007-12-04 Nidec Sankyo Corporation Lens, optical head apparatus, and objective lens for the optical head apparatus
JP4207740B2 (ja) * 2003-10-15 2009-01-14 パナソニック株式会社 光ピックアップ
KR101041075B1 (ko) * 2004-11-11 2011-06-13 삼성전자주식회사 광픽업 장치
KR100754517B1 (ko) * 2005-01-20 2007-09-03 삼성전자주식회사 회절소자 및 이를 포함하는 광픽업장치
US7567495B2 (en) * 2006-10-18 2009-07-28 Hitachi Media Electronics Co., Ltd. Optical pickup apparatus and optical disc apparatus using same
JP4552956B2 (ja) * 2007-04-03 2010-09-29 セイコーエプソン株式会社 照明装置及びプロジェクタ

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5647933A (en) * 1979-09-25 1981-04-30 Sony Corp Optical signal head
JPS5958637A (ja) * 1982-09-28 1984-04-04 Sony Corp 光学式再生装置
US4695992A (en) * 1983-01-31 1987-09-22 Canon Kabushiki Kaisha Optical information recording-reproducing apparatus in which the relative position of a primary beam and secondary beams on recording medium is varied during recording and reproduction of information
US4497534A (en) * 1983-02-28 1985-02-05 International Business Machines Corporation Holographic optical head
US4733065A (en) * 1984-06-27 1988-03-22 Canon Kabushiki Kaisha Optical head device with diffraction grating for separating a light beam incident on an optical recording medium from a light beam reflected therefrom
CA1257392A (en) * 1985-03-20 1989-07-11 Masayuki Kato Optical pickup with hologram lenses
DE3672426D1 (de) * 1985-09-27 1990-08-09 Sharp Kk Spurnachlaufverfahren fuer eine optische speicherplatte.
DE3679648D1 (de) * 1985-12-10 1991-07-11 Nec Corp Optischer kopf mit einem beugungsgitter zum richten von zwei oder mehreren gebeugten lichtstrahlen auf optische detektoren.
US4731772A (en) * 1986-05-06 1988-03-15 Lee Wai Hon Optical head using hologram lens for both beam splitting and focus error detection functions
JPS62270034A (ja) * 1986-05-19 1987-11-24 Sony Corp 光学式再生装置
DE3786497T2 (de) * 1986-07-18 1994-02-17 Nec Corp Doppelbrechendes Beugungsgitter und optischer Kopf, in welchem ein linearpolarisierter Strahl auf dieses Gitter gelenkt wird.
DE3778670D1 (de) * 1986-12-25 1992-06-04 Nec Corp Optischer kopf.
DE3855936T2 (de) * 1987-08-24 1998-01-02 Sharp Kk Optische Abtastvorrichtung
JPH0770065B2 (ja) * 1988-04-20 1995-07-31 シャープ株式会社 光ピックアップ装置

Also Published As

Publication number Publication date
US4983017A (en) 1991-01-08
EP0354019B1 (de) 1996-01-24
EP0354019A3 (de) 1991-02-06
EP0354019A2 (de) 1990-02-07
DE68925502T2 (de) 1996-07-18

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8328 Change in the person/name/address of the agent

Free format text: PATENTANWAELTE MUELLER & HOFFMANN, 81667 MUENCHEN

8339 Ceased/non-payment of the annual fee