JPS644939A - Magneto-optical disk - Google Patents

Magneto-optical disk

Info

Publication number
JPS644939A
JPS644939A JP15985287A JP15985287A JPS644939A JP S644939 A JPS644939 A JP S644939A JP 15985287 A JP15985287 A JP 15985287A JP 15985287 A JP15985287 A JP 15985287A JP S644939 A JPS644939 A JP S644939A
Authority
JP
Japan
Prior art keywords
magneto
films
reflectivity
optical recording
recording layers
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
JP15985287A
Other languages
Japanese (ja)
Inventor
Shintaro Oshima
Noboru Node
Akira Okada
Moriatsu Kaizuka
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.)
Shibasoku Co Ltd
Original Assignee
Shibasoku Co Ltd
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 Shibasoku Co Ltd filed Critical Shibasoku Co Ltd
Priority to JP15985287A priority Critical patent/JPS644939A/en
Publication of JPS644939A publication Critical patent/JPS644939A/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
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
    • G11B11/10584—Record carriers characterised by the selection of the material or by the structure or form characterised by the form, e.g. comprising mechanical protection elements
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
    • G11B11/10586—Record carriers characterised by the selection of the material or by the structure or form characterised by the selection of the material
    • G11B11/10589—Details
    • G11B11/10593—Details for improving read-out properties, e.g. polarisation of light

Abstract

PURPOSE:To decrease diffraction of light, scattering noises, etc., by alternately arranging single thin metallic films or thin alloy films having a high reflectivity and magneto-optical recording layers on a hard transparent substrate directly and on the same plane. CONSTITUTION:Tracking guides consisting of the single thin metallic films or thin alloy films 3 having the reflectivity higher than the reflectivity of the magneto-optical recording layers 4 are formed on the hard and transparent substrate 2 and further, the magneto-optical recording layers 4 having the axis of easy magnetization in the direction perpendicular to the film plane are formed directly on the surface of the substrate 2 in such a manner that the layers are alternately disposed on the same plane as the plane of the thin films 3 having the high reflectivity. A difference in the reflectivity between the single thin metallic films or thin alloy films 3 having the high reflectivity and the magneto-optical recording layers 4 is largely taken. The follow-up characteristic of tracking servo is thereby improved and the deterioration with age is decreased even after the film formation.
JP15985287A 1987-06-29 1987-06-29 Magneto-optical disk Pending JPS644939A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15985287A JPS644939A (en) 1987-06-29 1987-06-29 Magneto-optical disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15985287A JPS644939A (en) 1987-06-29 1987-06-29 Magneto-optical disk

Publications (1)

Publication Number Publication Date
JPS644939A true JPS644939A (en) 1989-01-10

Family

ID=15702641

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15985287A Pending JPS644939A (en) 1987-06-29 1987-06-29 Magneto-optical disk

Country Status (1)

Country Link
JP (1) JPS644939A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2416895A (en) * 2004-07-29 2006-02-08 Hewlett Packard Development Co Products with data encoded pattern
JP2008232220A (en) * 2007-03-19 2008-10-02 Tokai Rubber Ind Ltd Cylindrical vibration isolator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2416895A (en) * 2004-07-29 2006-02-08 Hewlett Packard Development Co Products with data encoded pattern
GB2416895B (en) * 2004-07-29 2008-12-10 Hewlett Packard Development Co Products with data-encoding pattern
JP2008232220A (en) * 2007-03-19 2008-10-02 Tokai Rubber Ind Ltd Cylindrical vibration isolator

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