CA1052906A - Method for protecting a flexible record disc and disc so protected - Google Patents

Method for protecting a flexible record disc and disc so protected

Info

Publication number
CA1052906A
CA1052906A CA229,898A CA229898A CA1052906A CA 1052906 A CA1052906 A CA 1052906A CA 229898 A CA229898 A CA 229898A CA 1052906 A CA1052906 A CA 1052906A
Authority
CA
Canada
Prior art keywords
disc
flexible
read
zone
face
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
CA229,898A
Other languages
English (en)
French (fr)
Other versions
CA229898S (en
Inventor
Claude Bricot
Bernard Carre
Claude Puech
Jean C. Lehureau
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 CA1052906A publication Critical patent/CA1052906A/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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/24018—Laminated discs

Landscapes

  • Manufacturing Optical Record Carriers (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
CA229,898A 1974-06-21 1975-06-23 Method for protecting a flexible record disc and disc so protected Expired CA1052906A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7421661A FR2275843A1 (fr) 1974-06-21 1974-06-21 Dispositif de protection permanente d'un disque souple d'enregistrement compatible avec une lecture optique

Publications (1)

Publication Number Publication Date
CA1052906A true CA1052906A (en) 1979-04-17

Family

ID=9140382

Family Applications (1)

Application Number Title Priority Date Filing Date
CA229,898A Expired CA1052906A (en) 1974-06-21 1975-06-23 Method for protecting a flexible record disc and disc so protected

Country Status (7)

Country Link
US (1) US4039764A (Direct)
JP (1) JPS5116903A (Direct)
CA (1) CA1052906A (Direct)
DE (1) DE2527084C3 (Direct)
FR (1) FR2275843A1 (Direct)
GB (1) GB1507214A (Direct)
IT (1) IT1039160B (Direct)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4038663A (en) * 1975-09-23 1977-07-26 U.S. Philips Corporation Method of writing information with a modulated radiation beam onto an information storage medium and information storage medium particularly adapted to the method
DE2615605C2 (de) * 1976-04-09 1978-06-01 Polygram Gmbh, 2000 Hamburg Scheibenförmiger Informationsträger und Verfahren zu seiner Herstellung
JPS56148749A (en) * 1980-04-17 1981-11-18 Pioneer Electronic Corp Optical thin-film video disk
US4447899A (en) * 1980-06-18 1984-05-08 Eastman Kodak Company Optical disc method, media and apparatus for writing and/or reading information
US4331966A (en) * 1980-10-06 1982-05-25 Storage Technology Corporation Information storage device and method of forming same
US4365257A (en) * 1981-03-05 1982-12-21 Minnesota Mining And Manufacturing Company Stretched-film optical recording disc
US4530082A (en) * 1982-06-28 1985-07-16 Eastman Kodak Company Optical disc write/read employing passive focus maintenance
US4561086A (en) * 1983-05-12 1985-12-24 Eastman Kodak Company Optical write/read unit with selective-transparency cover
US4613966A (en) * 1983-06-30 1986-09-23 International Business Machines Corporation Sealed encapsulation for floppy disk using centrifugal force to flatten disk
JPH02126463A (ja) * 1988-11-04 1990-05-15 Toshiba Corp 磁気ディスク装置
FR2710443B1 (fr) * 1993-09-22 1995-11-10 Digipress Sa Procédé d'enregistrement d'informations sur un disque optique et de lecture de celles-ci, support d'enregistrement et agencement de lecture pour la mise en Óoeuvre du procédé.
EP0686298B1 (fr) * 1993-12-23 2000-05-17 Thomson-Csf Procede et systeme optiques d'inscription/lecture d'information sur un support d'enregistrement
AT401831B (de) * 1994-03-15 1996-12-27 Koch Digitaldisc Ges M B H & C Einrichtung zur prüfung von matrizen
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
FR2739965B1 (fr) * 1995-10-17 1997-11-07 Thomson Csf Dispositif emetteur-recepteur de lumiere et systeme de lecture optique
FR2742911B1 (fr) * 1995-12-21 1998-02-06 Thomson Csf Support d'enregistrement/lecture optique d'informations et procede d'enregistrement
US5787069A (en) * 1996-09-13 1998-07-28 Digital Armor Inc. Protective cover for an optical disc
FR2786345B1 (fr) 1998-11-24 2001-02-09 Thomson Csf Dispositif de cryptage quantique
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

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1956626A (en) * 1931-03-14 1934-05-01 Percy A Robbins Translucent sound record
US3009707A (en) * 1960-03-15 1961-11-21 Schulein Joseph Combination phonograph record and package
US3430966A (en) * 1967-04-03 1969-03-04 Gauss Electrophysics Inc Transparent recording disc
US3518442A (en) * 1968-06-06 1970-06-30 Gauss Electrophysics Inc Video playback assembly wherein the record disc has optical recordings on both sides
US3855426A (en) * 1971-03-11 1974-12-17 Philips Corp Video disc recording and optical playback system therefor
US3854729A (en) * 1973-06-01 1974-12-17 T Downs Record divider and preservative

Also Published As

Publication number Publication date
FR2275843A1 (fr) 1976-01-16
DE2527084B2 (de) 1977-07-14
DE2527084A1 (de) 1976-01-08
US4039764A (en) 1977-08-02
JPS5116903A (Direct) 1976-02-10
FR2275843B1 (Direct) 1978-12-29
IT1039160B (it) 1979-12-10
GB1507214A (en) 1978-04-12
DE2527084C3 (de) 1978-03-09

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