CA1067999A - Optical device for projecting a radiation beam onto a data carrier - Google Patents

Optical device for projecting a radiation beam onto a data carrier

Info

Publication number
CA1067999A
CA1067999A CA262,092A CA262092A CA1067999A CA 1067999 A CA1067999 A CA 1067999A CA 262092 A CA262092 A CA 262092A CA 1067999 A CA1067999 A CA 1067999A
Authority
CA
Canada
Prior art keywords
optical
data carrier
plate
orthogonal
optical device
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
Application number
CA262,092A
Other languages
English (en)
French (fr)
Inventor
Jean-Claude Lehureau
Claude Bricot
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.)
Thomson-Brandt SA
Original Assignee
Thomson-Brandt SA
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 Thomson-Brandt SA filed Critical Thomson-Brandt SA
Application granted granted Critical
Publication of CA1067999A publication Critical patent/CA1067999A/en
Expired 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
    • G11B7/1365—Separate or integrated refractive elements, e.g. wave plates

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
CA262,092A 1975-09-29 1976-09-27 Optical device for projecting a radiation beam onto a data carrier Expired CA1067999A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7529706A FR2325951A1 (fr) 1975-09-29 1975-09-29 Procede de diminution de bruit optique et dispositif mettant en oeuvre un tel procede

Publications (1)

Publication Number Publication Date
CA1067999A true CA1067999A (en) 1979-12-11

Family

ID=9160560

Family Applications (1)

Application Number Title Priority Date Filing Date
CA262,092A Expired CA1067999A (en) 1975-09-29 1976-09-27 Optical device for projecting a radiation beam onto a data carrier

Country Status (6)

Country Link
US (1) US4139263A (en:Method)
JP (1) JPS5242702A (en:Method)
CA (1) CA1067999A (en:Method)
DE (1) DE2643901A1 (en:Method)
FR (1) FR2325951A1 (en:Method)
GB (1) GB1567642A (en:Method)

Families Citing this family (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2402956A1 (fr) * 1977-09-08 1979-04-06 Comp Generale Electricite Chaine d'amplification laser
US4310910A (en) * 1978-09-19 1982-01-12 Rca Corporation Optimal polarization for the optical readout of high density video recording
GB2070490B (en) * 1980-02-26 1984-07-04 Ferranti Ltd Laser cutting apparatus
US4443873A (en) * 1980-10-20 1984-04-17 Optical Coating Laboratory, Inc. Optical system for optical disc reader
USRE32660E (en) * 1982-04-19 1988-05-03 Siscan Systems, Inc. Confocal optical imaging system with improved signal-to-noise ratio
US4634880A (en) * 1982-04-19 1987-01-06 Siscan Systems, Inc. Confocal optical imaging system with improved signal-to-noise ratio
JPS58194149A (ja) * 1982-05-08 1983-11-12 Asahi Optical Co Ltd 光学的記録担体からの情報読取り装置
JPS6421725A (en) * 1987-07-15 1989-01-25 Mitsubishi Electric Corp Optical multi-wavelength recording and reproducing device
US5420848A (en) * 1990-08-02 1995-05-30 Canon Kabushiki Kaisha Optical system for optical information recording/reproducing apparatus having a galvano mirror
FR2723243B1 (fr) * 1994-07-26 1996-09-06 Thomson Csf Dispositif d'enregistrement et/ou de lecture de tetes magnetiques et son procede de realisation
US7301631B1 (en) * 2004-09-17 2007-11-27 J.A. Woollam Co., Inc. Control of uncertain angle of incidence of beam from Arc lamp
FR2739965B1 (fr) * 1995-10-17 1997-11-07 Thomson Csf Dispositif emetteur-recepteur de lumiere et systeme de lecture optique
JP3629275B2 (ja) * 1996-05-09 2005-03-16 シーゲイト テクノロジー エルエルシー 多重レンズフォーカシングを利用するレーザ照射によって磁気記録媒体に集合組織を形成する方法
US5955154A (en) * 1996-05-09 1999-09-21 Seagate Technology, Inc. Magnetic recording medium with laser textured glass or glass-ceramic substrate
US5783797A (en) * 1996-05-09 1998-07-21 Seagate Technology, Inc. Laser texturing of magnetic recording medium using a crystal material
US6020045A (en) * 1996-06-05 2000-02-01 Seagate Technology, Inc. Textured magnetic recording medium having a transition zone
DE19654845C2 (de) * 1996-12-27 2000-04-06 Chromatron Laser Sys Gmbh Vorrichtung zur Ablenkung von Lichtstrahlen
US5965215A (en) 1997-01-15 1999-10-12 Seagate Technology, Inc. Method for laser texturing a landing zone and a data zone of a magnetic recording medium
US6207926B1 (en) 1997-01-15 2001-03-27 Seagate Technology Llc Fiber optic laser texturing with optical probe feedback control
US6021032A (en) * 1997-01-15 2000-02-01 Seagate Technology, Inc. Magnetic recording medium with laser textured data zone
US5952058A (en) * 1997-01-15 1999-09-14 Seagate Technology, Inc. Laser texturing magnetic recording medium using fiber optics
US5853820A (en) * 1997-06-23 1998-12-29 Seagate Technology, Inc. Controlled laser texturing glass-ceramic substrates for magnetic recording media
US5956217A (en) * 1997-08-28 1999-09-21 Seagate Technology, Inc. Reference disk for determining glide height
US5837330A (en) * 1997-08-28 1998-11-17 Seagate Technology, Inc. Dual fiber optic laser texturing
US6068728A (en) * 1997-08-28 2000-05-30 Seagate Technology, Inc. Laser texturing with reverse lens focusing system
US5861196A (en) * 1997-09-25 1999-01-19 Seagate Technology, Inc. Laser texturing a glass or glass-ceramic substrate
US5945197A (en) * 1997-10-27 1999-08-31 Seagate Technology Laser texturing of magnetic recording medium using multiple lens focusing
FR2786345B1 (fr) 1998-11-24 2001-02-09 Thomson Csf Dispositif de cryptage quantique
US6093472A (en) * 1999-06-23 2000-07-25 Seagate Technology, Inc. Magnetic recording medium with laser textured glass or glass-ceramic substrate
US6468596B1 (en) 1999-07-15 2002-10-22 Seagate Technology Llc Laser-assisted in-situ fractionated lubricant and a new process for surface of magnetic recording media
US7149173B2 (en) * 2000-10-17 2006-12-12 Thales Medium for recording optically readable data, method for making same and optical system reproducing said data
FR2824905B1 (fr) * 2001-05-15 2003-08-29 Thomson Csf Gyrometre a fibre optique
JP4128113B2 (ja) * 2003-06-30 2008-07-30 オリオン機械株式会社 搾乳ユニットの自動搬送装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3944727A (en) * 1972-10-24 1976-03-16 Mca Discovision, Inc. Video disc player with movable mirror for directing light beam onto reflective disc
FR2222665B1 (en:Method) * 1973-03-21 1975-10-31 Thomson Brandt

Also Published As

Publication number Publication date
DE2643901A1 (de) 1977-04-07
JPS5242702A (en) 1977-04-02
US4139263A (en) 1979-02-13
FR2325951B1 (en:Method) 1979-04-06
FR2325951A1 (fr) 1977-04-22
GB1567642A (en) 1980-05-21

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