JPS56155793A - Optical memory medium - Google Patents

Optical memory medium

Info

Publication number
JPS56155793A
JPS56155793A JP5971580A JP5971580A JPS56155793A JP S56155793 A JPS56155793 A JP S56155793A JP 5971580 A JP5971580 A JP 5971580A JP 5971580 A JP5971580 A JP 5971580A JP S56155793 A JPS56155793 A JP S56155793A
Authority
JP
Japan
Prior art keywords
layer
recording
substrate
recording layer
memory medium
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
JP5971580A
Other languages
Japanese (ja)
Inventor
Shuzo Fukunishi
Manabu Yamamoto
Susumu Yonezawa
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP5971580A priority Critical patent/JPS56155793A/en
Publication of JPS56155793A publication Critical patent/JPS56155793A/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
    • G11B7/252—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

Landscapes

  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

PURPOSE:To obtain the optical memory medium having improved recording sensitivity by selecting the thickness of films of a transparent layer and a recording layer so that the reflection rate of a light falling from the side of the back surface of a substrate is 0.2% or below. CONSTITUTION:An information is recorded by applying laser beams collected by a lens 9 on the recording layer 8 of three-layer structure composed of a reflecting layer 5, the transparent layer 6 and the main recording layer 7 of a thin metal layer, all of which are formed on the substrate 4 of a disc, from the side of the recording layer 8. In this constitution, on the main surface of the substrate 4 is provided the recording layer 8 through the intermediary of the transparent layer 6 having larger refractive index than the substrate 4 and further the thickness of films of the recording layer 8 and the transparent layer 6 is selected so that the reflection rate of the light falling from the side of the back surface of the substrate 4 is 0.2% or below. Then the recording sensitivity is improved and adverse effect on recording and reproduction due to sticking of dust to the recording layer, etc. can be prevented.
JP5971580A 1980-05-06 1980-05-06 Optical memory medium Pending JPS56155793A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5971580A JPS56155793A (en) 1980-05-06 1980-05-06 Optical memory medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5971580A JPS56155793A (en) 1980-05-06 1980-05-06 Optical memory medium

Publications (1)

Publication Number Publication Date
JPS56155793A true JPS56155793A (en) 1981-12-02

Family

ID=13121173

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5971580A Pending JPS56155793A (en) 1980-05-06 1980-05-06 Optical memory medium

Country Status (1)

Country Link
JP (1) JPS56155793A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1982004159A1 (en) * 1981-05-14 1982-11-25 Oyama Tomoya An information recording medium
JPS6038745A (en) * 1983-08-09 1985-02-28 Nec Corp Optical recording medium and optical recording and reproducing method
JPS6042095A (en) * 1983-08-19 1985-03-06 Hitachi Ltd Information recording member

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1982004159A1 (en) * 1981-05-14 1982-11-25 Oyama Tomoya An information recording medium
JPS6038745A (en) * 1983-08-09 1985-02-28 Nec Corp Optical recording medium and optical recording and reproducing method
JPS6042095A (en) * 1983-08-19 1985-03-06 Hitachi Ltd Information recording member
JPH0461791B2 (en) * 1983-08-19 1992-10-02 Hitachi Ltd

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