DE69024747D1 - Magnetooptisches Aufzeichnungsmedium - Google Patents

Magnetooptisches Aufzeichnungsmedium

Info

Publication number
DE69024747D1
DE69024747D1 DE69024747T DE69024747T DE69024747D1 DE 69024747 D1 DE69024747 D1 DE 69024747D1 DE 69024747 T DE69024747 T DE 69024747T DE 69024747 T DE69024747 T DE 69024747T DE 69024747 D1 DE69024747 D1 DE 69024747D1
Authority
DE
Germany
Prior art keywords
magneto
recording medium
optical recording
optical
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.)
Expired - Fee Related
Application number
DE69024747T
Other languages
English (en)
Other versions
DE69024747T2 (de
Inventor
Tetsu Watanabe
Hidetoshi Watanabe
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.)
Sony Corp
Original Assignee
Sony 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
Priority claimed from JP1274734A external-priority patent/JP2847812B2/ja
Priority claimed from JP27714989A external-priority patent/JP2722725B2/ja
Application filed by Sony Corp filed Critical Sony Corp
Application granted granted Critical
Publication of DE69024747D1 publication Critical patent/DE69024747D1/de
Publication of DE69024747T2 publication Critical patent/DE69024747T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
DE69024747T 1989-10-21 1990-10-18 Magnetooptisches Aufzeichnungsmedium Expired - Fee Related DE69024747T2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1274734A JP2847812B2 (ja) 1989-10-21 1989-10-21 光磁気記録媒体
JP27714989A JP2722725B2 (ja) 1989-10-26 1989-10-26 光磁気記録媒体の製造方法

Publications (2)

Publication Number Publication Date
DE69024747D1 true DE69024747D1 (de) 1996-02-22
DE69024747T2 DE69024747T2 (de) 1996-08-14

Family

ID=26551169

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69024747T Expired - Fee Related DE69024747T2 (de) 1989-10-21 1990-10-18 Magnetooptisches Aufzeichnungsmedium

Country Status (4)

Country Link
EP (1) EP0424809B1 (de)
KR (1) KR100192104B1 (de)
CA (1) CA2027870C (de)
DE (1) DE69024747T2 (de)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03225650A (ja) * 1990-01-31 1991-10-04 Sony Corp 光ディスクシステム
US5392263A (en) * 1990-01-31 1995-02-21 Sony Corporation Magneto-optical disk system with specified thickness for protective layer on the disk relative to the numerical aperture of the objective lens
US5838646A (en) 1991-09-11 1998-11-17 Sony Corporation Optical disk having a protective layer of specified thickness relative to the numerical aperture of the objective lens
DE69327711T2 (de) * 1992-07-29 2000-06-29 Seiko Epson Corp Magnetooptisches aufzeichnungsmedium und verfahren zu seiner herstellung
US5392262A (en) * 1992-12-31 1995-02-21 International Business Machines Corporation Two-sided optical disks having recording layers disposed close to outer surfaces and spaced axially apart a greater distance and devices for using the disks
US5914915A (en) * 1995-02-03 1999-06-22 Sony Corporation Magneto-optical disk system having an objective lens with a numerical aperture related to the thickness of the protective layer
AU744670B2 (en) * 1995-02-24 2002-02-28 Sony Corporation Optical recording medium and method of producing same
JP3241560B2 (ja) * 1995-02-24 2001-12-25 ソニー株式会社 光学記録媒体及びその製造方法
JPH08306069A (ja) * 1995-05-11 1996-11-22 Seiko Epson Corp 光ディスクおよび光ディスクの製造方法
JPH09259470A (ja) * 1996-03-21 1997-10-03 Toshiba Corp 貼合せ情報記録媒体
US6534406B1 (en) * 2000-09-22 2003-03-18 Newport Fab, Llc Method for increasing inductance of on-chip inductors and related structure
EP1460627A4 (de) * 2001-12-25 2006-07-26 Fujitsu Ltd Optisches magnetisches aufzeichnungsmedium
JP2005203070A (ja) * 2003-12-15 2005-07-28 Pioneer Electronic Corp 記録媒体並びに記録再生方法及び記録再生装置
CN101131836A (zh) * 2006-08-25 2008-02-27 巨擘科技股份有限公司 改良保护层的单面双记录层光碟片及其制造方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57105839A (en) * 1980-12-24 1982-07-01 Ricoh Co Ltd Photo-thermal magnetic recording medium
JPS61104346A (ja) * 1984-10-23 1986-05-22 Canon Inc 光磁気記録媒体
JPS61193886A (ja) * 1985-02-22 1986-08-28 Tdk Corp 光記録媒体

Also Published As

Publication number Publication date
DE69024747T2 (de) 1996-08-14
KR910008677A (ko) 1991-05-31
EP0424809B1 (de) 1996-01-10
CA2027870C (en) 2000-09-12
EP0424809A2 (de) 1991-05-02
CA2027870A1 (en) 1991-04-22
KR100192104B1 (ko) 1999-06-15
EP0424809A3 (en) 1992-05-13

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8328 Change in the person/name/address of the agent

Free format text: PATENTANWAELTE MUELLER & HOFFMANN, 81667 MUENCHEN

8339 Ceased/non-payment of the annual fee