DE69222988D1 - Magnetooptisches Aufzeichnungsmedium - Google Patents

Magnetooptisches Aufzeichnungsmedium

Info

Publication number
DE69222988D1
DE69222988D1 DE69222988T DE69222988T DE69222988D1 DE 69222988 D1 DE69222988 D1 DE 69222988D1 DE 69222988 T DE69222988 T DE 69222988T DE 69222988 T DE69222988 T DE 69222988T DE 69222988 D1 DE69222988 D1 DE 69222988D1
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
DE69222988T
Other languages
English (en)
Other versions
DE69222988T2 (de
Inventor
Junichiro Nakayama
Junsaku Nakajima
Akira Takahashi
Kenji Ohta
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.)
Sharp Corp
Original Assignee
Sharp 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 Sharp Corp filed Critical Sharp Corp
Application granted granted Critical
Publication of DE69222988D1 publication Critical patent/DE69222988D1/de
Publication of DE69222988T2 publication Critical patent/DE69222988T2/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
    • 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
    • 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
    • G11B11/10502—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 characterised by the transducing operation to be executed
    • G11B11/10515—Reproducing
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/90—Magnetic feature
DE69222988T 1991-07-08 1992-07-08 Magnetooptisches Aufzeichnungsmedium Expired - Fee Related DE69222988T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3167201A JP2763419B2 (ja) 1991-07-08 1991-07-08 光磁気記録媒体

Publications (2)

Publication Number Publication Date
DE69222988D1 true DE69222988D1 (de) 1997-12-11
DE69222988T2 DE69222988T2 (de) 1998-04-30

Family

ID=15845301

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69222988T Expired - Fee Related DE69222988T2 (de) 1991-07-08 1992-07-08 Magnetooptisches Aufzeichnungsmedium

Country Status (6)

Country Link
US (1) US5595805A (de)
EP (1) EP0522840B1 (de)
JP (1) JP2763419B2 (de)
KR (1) KR100274179B1 (de)
CA (1) CA2073320C (de)
DE (1) DE69222988T2 (de)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE38501E1 (en) 1992-08-28 2004-04-20 Canon Kabushiki Kaisha Magnetooptical recording medium and information recording and reproducing methods using the recording medium
US5831944A (en) 1993-02-26 1998-11-03 Canon Kabushiki Kaisha Magnetooptical recording medium and method for reproducing information from a magnetooptical recording medium having three layers
US5674647A (en) * 1992-11-21 1997-10-07 Ulvac Coating Corporation Phase shift mask and manufacturing method thereof and exposure method using phase shift mask
JP3049482B2 (ja) * 1995-06-09 2000-06-05 富士通株式会社 光磁気記録媒体及びその再生方法
JPH09212927A (ja) * 1996-02-09 1997-08-15 Hitachi Ltd 光磁気記録媒体およびこれを用いる記録再生方法
JPH10134429A (ja) * 1996-10-25 1998-05-22 Fujitsu Ltd 光磁気記録媒体及びその再生方法
JPH11120639A (ja) * 1997-10-17 1999-04-30 Hitachi Ltd 光磁気情報記録装置
KR100304873B1 (ko) * 1998-04-24 2001-09-24 구자홍 광자기기록매체및그의재생방법
JP2000231749A (ja) * 1999-02-09 2000-08-22 Sony Corp 光磁気記録媒体及びその製造方法
US6770387B2 (en) 2000-10-26 2004-08-03 Fujitsu Limited Magneto-optical recording medium and method of reproducing the same
US6767656B2 (en) 2000-10-26 2004-07-27 Fujitsu Limited Magneto-optical recording medium and method of reproducing the same
JP2003233937A (ja) 2002-02-06 2003-08-22 Sony Corp 光学記録再生方法及び光記録媒体

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6032331B2 (ja) * 1980-03-12 1985-07-27 ケイディディ株式会社 磁気光学記録媒体
JPS5873746A (ja) * 1981-10-27 1983-05-04 Kokusai Denshin Denwa Co Ltd <Kdd> 光磁気記録媒体
US4670353A (en) * 1982-03-17 1987-06-02 Canon Kabushiki Kaisha Magnetooptical recording medium
JPS58165306A (ja) * 1982-03-26 1983-09-30 Hitachi Ltd 垂直磁気記録媒体
JPS59113162A (ja) * 1982-12-20 1984-06-29 Toshiba Corp 磁性合金
JPS59201247A (ja) * 1983-04-28 1984-11-14 Ricoh Co Ltd 光磁気記録媒体
CA1224270A (en) * 1983-09-16 1987-07-14 Junji Hirokane Magneto-optic memory element
JPS6070542A (ja) * 1983-09-27 1985-04-22 Fujitsu Ltd 光磁気記憶媒体
JPS6314343A (ja) * 1986-07-04 1988-01-21 Konica Corp 情報記録媒体
DE3752222T2 (de) * 1986-07-08 1999-03-25 Canon K.K., Tokio/Tokyo Magnetoptisches Aufzeichnungsmedium mit der Möglichkeit des Überschreibens mit zwei oder mehr Magnetschichten und dieses Medium verwendende Aufzeichnungsmethode
DE3811374A1 (de) * 1988-04-05 1989-10-19 Siemens Ag Datenspeichersystem und verfahren zu seiner herstellung
CA1326547C (en) * 1988-07-13 1994-01-25 Masahiko Kaneko Thermomagnetic recording method
JP2880723B2 (ja) * 1989-03-15 1999-04-12 ソニー株式会社 光磁気ディスク

Also Published As

Publication number Publication date
JPH0512731A (ja) 1993-01-22
JP2763419B2 (ja) 1998-06-11
EP0522840A3 (en) 1993-08-18
DE69222988T2 (de) 1998-04-30
EP0522840A2 (de) 1993-01-13
EP0522840B1 (de) 1997-11-05
CA2073320A1 (en) 1993-01-09
CA2073320C (en) 1996-12-03
KR930003034A (ko) 1993-02-23
KR100274179B1 (ko) 2001-01-15
US5595805A (en) 1997-01-21

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee