BE901719A - Disque a memoire lisible par voie optique. - Google Patents

Disque a memoire lisible par voie optique.

Info

Publication number
BE901719A
BE901719A BE0/214507A BE214507A BE901719A BE 901719 A BE901719 A BE 901719A BE 0/214507 A BE0/214507 A BE 0/214507A BE 214507 A BE214507 A BE 214507A BE 901719 A BE901719 A BE 901719A
Authority
BE
Belgium
Prior art keywords
memory disc
readable memory
optically readable
recording layer
outer edges
Prior art date
Application number
BE0/214507A
Other languages
English (en)
French (fr)
Original Assignee
Philips Nv
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 Philips Nv filed Critical Philips Nv
Publication of BE901719A publication Critical patent/BE901719A/fr

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
    • G11B7/24097—Structures for detection, control, recording operation or replay operation; Special shapes or structures for centering or eccentricity prevention; Arrangements for testing, inspecting or evaluating; Containers, cartridges or cassettes
    • 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
    • G11B7/24015—Air-sandwiched discs

Landscapes

  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Packaging For Recording Disks (AREA)
BE0/214507A 1984-02-14 1985-02-12 Disque a memoire lisible par voie optique. BE901719A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL8400476A NL8400476A (nl) 1984-02-14 1984-02-14 Optisch uitleesbare geheugenschijf.

Publications (1)

Publication Number Publication Date
BE901719A true BE901719A (fr) 1985-08-12

Family

ID=19843488

Family Applications (1)

Application Number Title Priority Date Filing Date
BE0/214507A BE901719A (fr) 1984-02-14 1985-02-12 Disque a memoire lisible par voie optique.

Country Status (11)

Country Link
JP (1) JPS60140235U (it)
BE (1) BE901719A (it)
CA (1) CA1241744A (it)
DD (1) DD228381A5 (it)
DE (1) DE3505015A1 (it)
ES (1) ES8606710A1 (it)
FR (1) FR2559607A1 (it)
GB (1) GB2155684B (it)
IT (1) IT1183232B (it)
NL (1) NL8400476A (it)
SU (1) SU1487826A3 (it)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2343784B (en) * 1998-11-16 2001-08-01 Leung Ching Yuen Irregular optical disc
US20020136155A1 (en) * 2001-03-06 2002-09-26 Chieh-Ho Chen CD safe to hold

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE203656C (it) *
DE190908C (it) *
GB335768A (en) * 1929-10-24 1930-10-02 Jacoviac Maurice Improvements in protecting devices for gramophone disc records
DE883811C (de) * 1951-06-08 1953-07-20 Hermann Geiselhart Ring aus Gummi als Plattenschutz
US4331966A (en) * 1980-10-06 1982-05-25 Storage Technology Corporation Information storage device and method of forming same
JPS5774842A (en) * 1980-10-24 1982-05-11 Mitsubishi Electric Corp Optical information recording disk
US4376963A (en) * 1980-12-19 1983-03-15 International Business Machines Corporation Composite magnetic recording disk
JPS57150155A (en) * 1981-03-09 1982-09-16 Matsushita Electric Ind Co Ltd Magnetooptic disc
JPS57172541A (en) * 1981-04-15 1982-10-23 Toshiba Corp Information storage medium
JPS57172542A (en) * 1981-04-15 1982-10-23 Toshiba Corp Information storage medium
FR2528216B1 (fr) * 1982-06-08 1988-01-08 Thomson Csf Disque optique protege a porte-couche libre
JPS5987636A (ja) * 1982-11-10 1984-05-21 Toshiba Corp 情報記憶媒体

Also Published As

Publication number Publication date
FR2559607A1 (fr) 1985-08-16
CA1241744A (en) 1988-09-06
GB2155684A (en) 1985-09-25
DD228381A5 (de) 1985-10-09
IT1183232B (it) 1987-10-15
ES8606710A1 (es) 1986-04-01
JPS60140235U (ja) 1985-09-17
ES540285A0 (es) 1986-04-01
GB2155684B (en) 1988-11-02
IT8519458A0 (it) 1985-02-11
NL8400476A (nl) 1985-09-02
SU1487826A3 (ru) 1989-06-15
DE3505015A1 (de) 1985-08-14
GB8503678D0 (en) 1985-03-13

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Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: N.V. PHILIPS'GLOEILAMPENFABRIEKEN

Effective date: 19890228