BE901719A - OPTICALLY READABLE MEMORY DISC. - Google Patents

OPTICALLY READABLE MEMORY DISC.

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
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/en

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)

Abstract

Un disque à mémoire présente un substrat transparent (21), sur lequel est appliquée la couche d'enregistrement (22), qui est recouverte d'une plaque de recouvrement fixée à l'aide de moyens annulaires (26, 27) à quelque distance de la couche d'enregistrement sur le premier substrat de facon à enfermer un espace(24). Des moyens marginaux proctecteurs (25) font partie des moyens annulaires (26) pour la protection des bords extérieurs (29) et (214). Des espaces 212 et 213 se trouvent entre les bords extérieurs des substrats et les moyens marginaux qui pourraient transmettre des forces nuisibles.A memory disc has a transparent substrate (21), on which the recording layer (22) is applied, which is covered with a cover plate fixed with annular means (26, 27) at some distance of the recording layer on the first substrate so as to enclose a space (24). Marginal protective means (25) form part of the annular means (26) for the protection of the outer edges (29) and (214). Spaces 212 and 213 are located between the outer edges of the substrates and the marginal means which could transmit harmful forces.

BE0/214507A 1984-02-14 1985-02-12 OPTICALLY READABLE MEMORY DISC. BE901719A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL8400476A NL8400476A (en) 1984-02-14 1984-02-14 OPTICALLY READABLE MEMORY DRIVE.

Publications (1)

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

Family

ID=19843488

Family Applications (1)

Application Number Title Priority Date Filing Date
BE0/214507A BE901719A (en) 1984-02-14 1985-02-12 OPTICALLY READABLE MEMORY DISC.

Country Status (11)

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

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
DE190908C (en) *
DE203656C (en) *
GB335768A (en) * 1929-10-24 1930-10-02 Jacoviac Maurice Improvements in protecting devices for gramophone disc records
DE883811C (en) * 1951-06-08 1953-07-20 Hermann Geiselhart Ring made of rubber as plate protection
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
JPS57172542A (en) * 1981-04-15 1982-10-23 Toshiba Corp Information storage medium
JPS57172541A (en) * 1981-04-15 1982-10-23 Toshiba Corp Information storage medium
FR2528216B1 (en) * 1982-06-08 1988-01-08 Thomson Csf PROTECTED OPTICAL DISC WITH FREE LAYER
JPS5987636A (en) * 1982-11-10 1984-05-21 Toshiba Corp Information storage medium

Also Published As

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

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Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: N.V. PHILIPS'GLOEILAMPENFABRIEKEN

Effective date: 19890228