ES8606710A1 - Optically readable storage disc - Google Patents

Optically readable storage disc

Info

Publication number
ES8606710A1
ES8606710A1 ES540285A ES540285A ES8606710A1 ES 8606710 A1 ES8606710 A1 ES 8606710A1 ES 540285 A ES540285 A ES 540285A ES 540285 A ES540285 A ES 540285A ES 8606710 A1 ES8606710 A1 ES 8606710A1
Authority
ES
Spain
Prior art keywords
substrate
protective
edge
spacer
readable storage
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
ES540285A
Other languages
Spanish (es)
Other versions
ES540285A0 (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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken 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 Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of ES8606710A1 publication Critical patent/ES8606710A1/en
Publication of ES540285A0 publication Critical patent/ES540285A0/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
    • G11B7/24097—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

An optically readable storage disc comprises a transparent substrate (21) with a recording layer (22) on it, and a cover (25) which is peripherally connected to the substrate and spaced from it by an annular spacer (26) with an adhesive layer to form a sealed space (24) in which the recording layer is situated. A protective annular rim (25) formed integrally with the spacer projects beyond the edge of the substrate to protect this edge, which is vulnerable to impact forces and thermal stresses. Between the edge of the substrate and the periphery of the protective rim, a space or spaces (212, 213) exists or exist in which there are no means which could transmit undesirably large forces in the event of deformation of the protective rim (readily deformable material may be present). Such forces are transmitted by the spacer (26) to the side only of the substrate. Slits or apertures may be provided in the circumferential protective means to assist deformation. Small balancing masses may be provided. Alternative constructions are detailed (Figs. 1,3,4). Thermal stresses are also considered.
ES540285A 1984-02-14 1985-02-11 Optically readable storage disc Expired ES8606710A1 (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 (2)

Publication Number Publication Date
ES8606710A1 true ES8606710A1 (en) 1986-04-01
ES540285A0 ES540285A0 (en) 1986-04-01

Family

ID=19843488

Family Applications (1)

Application Number Title Priority Date Filing Date
ES540285A Expired ES8606710A1 (en) 1984-02-14 1985-02-11 Optically readable storage 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
SU1487826A3 (en) 1989-06-15
BE901719A (en) 1985-08-12
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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