DE68917965D1 - Fehlerdetektorvorrichtung für einen optischen Abtastkopf. - Google Patents

Fehlerdetektorvorrichtung für einen optischen Abtastkopf.

Info

Publication number
DE68917965D1
DE68917965D1 DE68917965T DE68917965T DE68917965D1 DE 68917965 D1 DE68917965 D1 DE 68917965D1 DE 68917965 T DE68917965 T DE 68917965T DE 68917965 T DE68917965 T DE 68917965T DE 68917965 D1 DE68917965 D1 DE 68917965D1
Authority
DE
Germany
Prior art keywords
optical scanning
detector device
scanning head
fault detector
fault
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
DE68917965T
Other languages
English (en)
Other versions
DE68917965T2 (de
Inventor
Kenji Fukui
Akira Kawai
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.)
Tosoh Corp
Original Assignee
Tosoh 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
Application filed by Tosoh Corp filed Critical Tosoh Corp
Application granted granted Critical
Publication of DE68917965D1 publication Critical patent/DE68917965D1/de
Publication of DE68917965T2 publication Critical patent/DE68917965T2/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
    • G11B7/08—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
    • G11B7/0908—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 focusing only
    • G11B7/0909—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 focusing only by astigmatic methods
    • 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
    • G11B7/1372—Lenses
    • G11B2007/13722—Fresnel lenses

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Automatic Focus Adjustment (AREA)
  • Optical Head (AREA)
DE68917965T 1988-03-25 1989-03-21 Fehlerdetektorvorrichtung für einen optischen Abtastkopf. Expired - Fee Related DE68917965T2 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP6986788 1988-03-25
JP8926888 1988-04-13
JP15685288 1988-06-27

Publications (2)

Publication Number Publication Date
DE68917965D1 true DE68917965D1 (de) 1994-10-13
DE68917965T2 DE68917965T2 (de) 1995-01-05

Family

ID=27300163

Family Applications (1)

Application Number Title Priority Date Filing Date
DE68917965T Expired - Fee Related DE68917965T2 (de) 1988-03-25 1989-03-21 Fehlerdetektorvorrichtung für einen optischen Abtastkopf.

Country Status (3)

Country Link
US (1) US5195072A (de)
EP (1) EP0334601B1 (de)
DE (1) DE68917965T2 (de)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5351230A (en) * 1991-10-23 1994-09-27 Nippon Steel Corporation Optical information system focal point displacement detecting means having Fresnel zone plates with rectilinear grating
KR950005033B1 (ko) * 1992-11-06 1995-05-17 주식회사금성사 광픽업 장치
KR950015239A (ko) * 1993-11-05 1995-06-16 배순훈 포커스 에러 검출장치
JPH07262636A (ja) * 1994-03-17 1995-10-13 Pioneer Electron Corp 光記録媒体再生装置
US5566151A (en) * 1995-06-07 1996-10-15 International Business Machines Corporation Optical devices having array detectors with light receiving photo arrays larger than an incident laser beam cross-section
US6259668B1 (en) * 1996-02-14 2001-07-10 Samsung Electronics Co., Ltd. Recording/reproducing apparatus having an optical pickup device to read from and record information to disks of different thicknesses
US6222812B1 (en) 1996-08-29 2001-04-24 Samsung Electronics Co., Ltd. Optical pickup using an optical phase plate
US6639889B1 (en) 1997-02-13 2003-10-28 Samsung Electronics Co., Ltd. Recording/reproducing apparatus including an optical pickup having an objective lens compatible with a plurality of optical disk formats
US6304540B1 (en) * 1998-03-30 2001-10-16 Samsung Electronics Co., Ltd. Optical pickup compatible with a digital versatile disk and a recordable compact disk using a holographic ring lens
EP1034537A2 (de) * 1998-06-15 2000-09-13 Koninklijke Philips Electronics N.V. Anordnung zum abtasten eines optischen aufzeichnungsträgers
JP3147879B2 (ja) * 1998-12-08 2001-03-19 日本電気株式会社 光学的情報記録再生装置
KR20030093683A (ko) * 2002-06-05 2003-12-11 삼성전자주식회사 호환형 광픽업
US8737178B2 (en) * 2006-09-05 2014-05-27 Seagate Technology Llc Alignment feature for near-field transducers
KR20110019524A (ko) * 2009-08-20 2011-02-28 삼성전자주식회사 극자외선용 투과형 렌즈 및 이를 포함하는 광학 시스템
CN102901998A (zh) * 2011-07-27 2013-01-30 联钢精密科技(苏州)有限公司 一种菲涅尔透镜
EP2926179A1 (de) 2012-11-30 2015-10-07 Essilor International (Compagnie Générale d'Optique) Fresnel-linse und optische vorrichtung
DE102018116697B4 (de) 2018-07-10 2022-06-02 Michael Schumacher GmbH Verfahren zum Bearbeiten einer Oberfläche eines Schmuckstücks und diesbezügliche Graviermaschine

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2445333A1 (de) * 1973-10-01 1975-04-10 Philips Nv Optoelektronisches system zur bestimmung einer abweichung zwischen der istlage und der sollage einer ebene in einem optischen abbildungssystem
US4441175A (en) * 1982-01-25 1984-04-03 Magnetic Peripherals Inc. Partial beam focus sensing in an optical recording system
JPS5933637A (ja) * 1982-08-17 1984-02-23 Mitsubishi Electric Corp 光ピツクアツプ
JPS6093643A (ja) * 1983-10-25 1985-05-25 Toshiba Corp 光学ヘツド
EP0180767B1 (de) * 1984-10-11 1990-01-31 Hitachi, Ltd. Halterung für optische Linse
US4817074A (en) * 1985-12-19 1989-03-28 Nec Corporation Method and apparatus for detecting the focusing state and positioning accuracy of a light beam directed onto an optical disk tracking guide in an optical recording system
DE3887762T2 (de) * 1987-03-17 1994-09-08 Matsushita Electric Ind Co Ltd Optischer Kopf.
US4895790A (en) * 1987-09-21 1990-01-23 Massachusetts Institute Of Technology High-efficiency, multilevel, diffractive optical elements

Also Published As

Publication number Publication date
EP0334601A3 (en) 1989-12-20
EP0334601B1 (de) 1994-09-07
EP0334601A2 (de) 1989-09-27
US5195072A (en) 1993-03-16
DE68917965T2 (de) 1995-01-05

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee