Nothing Special   »   [go: up one dir, main page]

FR2325951A1 - Procede de diminution de bruit optique et dispositif mettant en oeuvre un tel procede - Google Patents

Procede de diminution de bruit optique et dispositif mettant en oeuvre un tel procede

Info

Publication number
FR2325951A1
FR2325951A1 FR7529706A FR7529706A FR2325951A1 FR 2325951 A1 FR2325951 A1 FR 2325951A1 FR 7529706 A FR7529706 A FR 7529706A FR 7529706 A FR7529706 A FR 7529706A FR 2325951 A1 FR2325951 A1 FR 2325951A1
Authority
FR
France
Prior art keywords
noise reduction
device implementing
optical noise
reduction process
optical
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.)
Granted
Application number
FR7529706A
Other languages
English (en)
Other versions
FR2325951B1 (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
Priority to FR7529706A priority Critical patent/FR2325951A1/fr
Priority to US05/726,474 priority patent/US4139263A/en
Priority to CA262,092A priority patent/CA1067999A/fr
Priority to GB40080/76A priority patent/GB1567642A/en
Priority to JP51117060A priority patent/JPS5242702A/ja
Priority to DE19762643901 priority patent/DE2643901A1/de
Publication of FR2325951A1 publication Critical patent/FR2325951A1/fr
Application granted granted Critical
Publication of FR2325951B1 publication Critical patent/FR2325951B1/fr
Granted 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)
FR7529706A 1975-09-29 1975-09-29 Procede de diminution de bruit optique et dispositif mettant en oeuvre un tel procede Granted FR2325951A1 (fr)

Priority Applications (6)

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
US05/726,474 US4139263A (en) 1975-09-29 1976-09-24 Optical device for projecting a radiation beam onto a data carrier
CA262,092A CA1067999A (fr) 1975-09-29 1976-09-27 Dispositif optique pour projeter un faisceau lumineux sur un porteur de donnees
GB40080/76A GB1567642A (en) 1975-09-29 1976-09-27 Optical device for projecting a radiation beam onto a datacarrier
JP51117060A JPS5242702A (en) 1975-09-29 1976-09-29 Optical device for projecting optical beam to data carrier
DE19762643901 DE2643901A1 (de) 1975-09-29 1976-09-29 Optische vorrichtung zur beleuchtung eines beweglichen informationstraegers

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 (2)

Publication Number Publication Date
FR2325951A1 true FR2325951A1 (fr) 1977-04-22
FR2325951B1 FR2325951B1 (fr) 1979-04-06

Family

ID=9160560

Family Applications (1)

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

Country Status (6)

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

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
US4634880A (en) * 1982-04-19 1987-01-06 Siscan Systems, Inc. Confocal optical imaging system with improved signal-to-noise ratio
USRE32660E (en) * 1982-04-19 1988-05-03 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
US5783797A (en) * 1996-05-09 1998-07-21 Seagate Technology, Inc. Laser texturing of magnetic recording medium using a crystal material
WO1997042628A1 (fr) * 1996-05-09 1997-11-13 Seagate Technology, Inc. Texturation au laser de supports d'enregistrement magnetique a l'aide d'une focalisation a lentilles multiples
WO1997042629A1 (fr) * 1996-05-09 1997-11-13 Seagate Technology, Inc. Support d'enregistrement magnetique a substrat en verre ou en vitroceramique texture par laser
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
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
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
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

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2222665A1 (fr) * 1973-03-21 1974-10-18 Thomson Brandt

Family Cites Families (1)

* 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

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2222665A1 (fr) * 1973-03-21 1974-10-18 Thomson Brandt

Also Published As

Publication number Publication date
CA1067999A (fr) 1979-12-11
FR2325951B1 (fr) 1979-04-06
US4139263A (en) 1979-02-13
DE2643901A1 (de) 1977-04-07
JPS5242702A (en) 1977-04-02
GB1567642A (en) 1980-05-21

Similar Documents

Publication Publication Date Title
FR2325951A1 (fr) Procede de diminution de bruit optique et dispositif mettant en oeuvre un tel procede
FR2323160A1 (fr) Dispositif optique de projection et lecteur optique comportant un tel dispositif
FR2330027A1 (fr) Dispositif de focalisation a vergence variable et lecteur optique comportant un tel dispositif
FR2325953A1 (fr) Senseur optique de focalisation et dispositif de focalisation comportant un tel senseur
FR2330062A1 (fr) Dispositif de recherche de focalisation et lecteur optique comportant un tel dispositif
FR2285648A1 (fr) Dispositif de positionnement d'element et procede de mise en oeuvre d'un tel dispositif
FR2301849A1 (fr) Dispositif de traitement electrostatographique comportant un
FR1453933A (fr) Filtre variable circulaire et procédé et appareil de fabrication d'un tel filtre
FR2336841A1 (fr) Dispositif de reduction de bruit
BE768164A (fr) Procede et dispositif optique de filtrage des frequences spatiales
JPS5263793A (en) Optical signal reader
FR2277483A1 (fr) Dispositif de traitement de signaux de television
FR2328979A1 (fr) Dispositif a lentille electrochroique
NL7701783A (nl) Videosignaalbewerkingsinrichting.
FR2321010A1 (fr) Dispositif pour defibreur
FR2321711A1 (fr) Dispositif optique a mise au point automatique et lecteur optique comportant un tel dispositif
FR2301850A1 (fr) Procede et dispositif pou
FR2290379A1 (fr) Procede et dispositif de bobinage de fil synthetique
FR2288572A1 (fr) Procede et dispositif de fabrication de poulies multigorges
DD133179A5 (de) Signalverarbeitungsvorrichtung
FR2315975A1 (fr) Dispositif de filtration
FR2309888A1 (fr) Dispositif optique de projection et lecteur optique comportant un tel dispositif
BE833480A (fr) Dispositif optique
FR2295444A1 (fr) Dispositif optique
BE858180A (fr) Dispositif de blindage

Legal Events

Date Code Title Description
ST Notification of lapse