JPS53116108A - Glass for production of original discs of video discs - Google Patents

Glass for production of original discs of video discs

Info

Publication number
JPS53116108A
JPS53116108A JP2998177A JP2998177A JPS53116108A JP S53116108 A JPS53116108 A JP S53116108A JP 2998177 A JP2998177 A JP 2998177A JP 2998177 A JP2998177 A JP 2998177A JP S53116108 A JPS53116108 A JP S53116108A
Authority
JP
Japan
Prior art keywords
discs
glass
production
original
video
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.)
Pending
Application number
JP2998177A
Other languages
Japanese (ja)
Inventor
Seiji Sunayama
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP2998177A priority Critical patent/JPS53116108A/en
Publication of JPS53116108A publication Critical patent/JPS53116108A/en
Pending 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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • 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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
    • G11B7/2531—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising glass

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing Optical Record Carriers (AREA)
  • Glass Compositions (AREA)

Abstract

PURPOSE:To reduce the noise of video discs by using specific glass.
JP2998177A 1977-03-18 1977-03-18 Glass for production of original discs of video discs Pending JPS53116108A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2998177A JPS53116108A (en) 1977-03-18 1977-03-18 Glass for production of original discs of video discs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2998177A JPS53116108A (en) 1977-03-18 1977-03-18 Glass for production of original discs of video discs

Publications (1)

Publication Number Publication Date
JPS53116108A true JPS53116108A (en) 1978-10-11

Family

ID=12291127

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2998177A Pending JPS53116108A (en) 1977-03-18 1977-03-18 Glass for production of original discs of video discs

Country Status (1)

Country Link
JP (1) JPS53116108A (en)

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