GB1567642A - Optical device for projecting a radiation beam onto a datacarrier - Google Patents

Optical device for projecting a radiation beam onto a datacarrier Download PDF

Info

Publication number
GB1567642A
GB1567642A GB40080/76A GB4008076A GB1567642A GB 1567642 A GB1567642 A GB 1567642A GB 40080/76 A GB40080/76 A GB 40080/76A GB 4008076 A GB4008076 A GB 4008076A GB 1567642 A GB1567642 A GB 1567642A
Authority
GB
United Kingdom
Prior art keywords
optical
orthogonal
data carrier
plate
source
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
GB40080/76A
Other languages
English (en)
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
Publication of GB1567642A publication Critical patent/GB1567642A/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)
GB40080/76A 1975-09-29 1976-09-27 Optical device for projecting a radiation beam onto a datacarrier Expired GB1567642A (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
GB1567642A true GB1567642A (en) 1980-05-21

Family

ID=9160560

Family Applications (1)

Application Number Title Priority Date Filing Date
GB40080/76A Expired GB1567642A (en) 1975-09-29 1976-09-27 Optical device for projecting a radiation beam onto a datacarrier

Country Status (6)

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

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 (enExample) * 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 (enExample) 1979-04-06
CA1067999A (en) 1979-12-11
FR2325951A1 (fr) 1977-04-22

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee