DE69225159D1 - Magnetooptisches Medium - Google Patents

Magnetooptisches Medium

Info

Publication number
DE69225159D1
DE69225159D1 DE69225159T DE69225159T DE69225159D1 DE 69225159 D1 DE69225159 D1 DE 69225159D1 DE 69225159 T DE69225159 T DE 69225159T DE 69225159 T DE69225159 T DE 69225159T DE 69225159 D1 DE69225159 D1 DE 69225159D1
Authority
DE
Germany
Prior art keywords
magneto
optical medium
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 - Lifetime
Application number
DE69225159T
Other languages
English (en)
Other versions
DE69225159T2 (de
Inventor
Masumi Ohta
Isamu Nakao
Toshiki Udagawa
Atsushi Fukumoto
Shuni Yoshimura
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 JP1807091A external-priority patent/JPH04255937A/ja
Priority claimed from JP4289091A external-priority patent/JPH04259943A/ja
Application filed by Sony Corp filed Critical Sony Corp
Application granted granted Critical
Publication of DE69225159D1 publication Critical patent/DE69225159D1/de
Publication of DE69225159T2 publication Critical patent/DE69225159T2/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G11B11/10595—Control of operating function
    • G11B11/10597—Adaptations for transducing various formats on the same or different carriers
    • 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
    • G11B11/10586—Record carriers characterised by the selection of the material or by the structure or form characterised by the selection of the material
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/12—Control of operating function, e.g. switching from recording to reproducing by sensing distinguishing features of or on records, e.g. diameter end mark
DE69225159T 1991-02-08 1992-02-07 Magnetooptisches Medium Expired - Lifetime DE69225159T2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1807091A JPH04255937A (ja) 1991-02-08 1991-02-08 光磁気記録媒体
JP4289091A JPH04259943A (ja) 1991-02-15 1991-02-15 光磁気ディスクの記録再生装置

Publications (2)

Publication Number Publication Date
DE69225159D1 true DE69225159D1 (de) 1998-05-28
DE69225159T2 DE69225159T2 (de) 1998-08-13

Family

ID=26354690

Family Applications (2)

Application Number Title Priority Date Filing Date
DE69231042T Expired - Lifetime DE69231042T2 (de) 1991-02-08 1992-02-07 Magnetooptisches Aufzeichnungs- und/oder -wiedergabegerät
DE69225159T Expired - Lifetime DE69225159T2 (de) 1991-02-08 1992-02-07 Magnetooptisches Medium

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DE69231042T Expired - Lifetime DE69231042T2 (de) 1991-02-08 1992-02-07 Magnetooptisches Aufzeichnungs- und/oder -wiedergabegerät

Country Status (3)

Country Link
US (1) US5579294A (de)
EP (2) EP0498459B1 (de)
DE (2) DE69231042T2 (de)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2986622B2 (ja) * 1992-09-02 1999-12-06 シャープ株式会社 光磁気メモリー素子およびその記録再生方法
US5699342A (en) * 1994-02-07 1997-12-16 Mitsubishi Denki Kabushiki Kaisha Method of and device for recording and playing back an optical disk having a test playback region utilizing pits of minimum size for controlling the power of the laser
JPH07244876A (ja) * 1994-03-01 1995-09-19 Sharp Corp 光磁気記録媒体及び光磁気記録再生方法
US5568461A (en) * 1994-04-20 1996-10-22 Matsushita Electric Industrial Co., Ltd. Optical information recording and reproducing apparatus
JPH0927154A (ja) * 1995-07-10 1997-01-28 Fujitsu Ltd 光磁気ディスク装置
EP0758125B1 (de) * 1995-08-09 2002-01-23 Sony Corporation Aufzeichnungsmedium, Aufzeichnungsgerät und Wiedergabegerät
JP3424037B2 (ja) * 1996-04-05 2003-07-07 富士通株式会社 光磁気記録媒体の情報再生方法及び情報記録方法、並びに光磁気再生装置
US6049517A (en) * 1996-04-30 2000-04-11 Sony Corporation Dual format audio signal compression
US6226233B1 (en) 1996-07-30 2001-05-01 Seagate Technology, Inc. Magneto-optical system utilizing MSR media
US5982723A (en) * 1996-09-30 1999-11-09 Laser Dynamics, Inc. Data recording and reproducing method for multi-layered optical disk system
US20050058039A1 (en) * 1997-01-16 2005-03-17 Yasuo Kamatani Multi-standard optical disk and method and apparatus of reading from and recording to the disk
JP3615021B2 (ja) * 1997-06-30 2005-01-26 富士通株式会社 光学的記憶装置及び光記憶媒体の記録再生方法
US6847590B2 (en) * 1997-07-04 2005-01-25 Sanyo Electric Co., Ltd. Magneto-optical recording medium including a calibration magnetic domain recorded in a predetermined pattern in a recording layer
JP3520183B2 (ja) * 1997-07-04 2004-04-19 三洋電機株式会社 光磁気記録媒体の再生装置
JPH11283291A (ja) 1998-01-30 1999-10-15 Fujitsu Ltd 記憶装置、光学的記録媒体及び情報記録方法
US6278667B1 (en) * 1998-01-30 2001-08-21 Seagate Technology, Inc. System and method for light power control in a magneto-optical drive
JP2000021039A (ja) * 1998-06-30 2000-01-21 Sony Corp 再生装置及び再生方法
JP3675340B2 (ja) * 2001-01-26 2005-07-27 ヤマハ株式会社 情報記録装置およびプログラム
US7317674B2 (en) * 2003-03-11 2008-01-08 Intersil Americas Inc. Optical pick-up units and laser drivers with increased functionality
JP2007334992A (ja) * 2006-06-15 2007-12-27 Hitachi Ltd 光ディスク再生装置および光ディスク再生方法
US7813247B2 (en) * 2006-07-06 2010-10-12 Intersil Americas Inc. Hybrid laser diode drivers that include a decoder
US8018809B2 (en) * 2007-05-16 2011-09-13 Intersil Americas Inc. Hybrid laser diode drivers

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2110459B (en) * 1982-11-08 1985-08-14 Kokusai Denshin Denwa Co Ltd Magneto-optical recording system
JPS6171472A (ja) * 1984-09-14 1986-04-12 Pioneer Electronic Corp 記録デイスク演奏装置
JP2647649B2 (ja) * 1986-07-03 1997-08-27 パイオニア株式会社 光ディスク記録方法
EP0258978B1 (de) * 1986-07-08 1998-10-07 Canon Kabushiki Kaisha Magnetoptisches Aufzeichnungsmedium mit der Möglichkeit des Überschreibens mit zwei oder mehr Magnetschichten und dieses Medium verwendende Aufzeichnungsmethode
JPS6358661A (ja) * 1986-08-29 1988-03-14 Mitsubishi Electric Corp フロツピ−デイスクのタイプ識別回路
DE3889203T2 (de) * 1987-11-30 1994-11-03 Sony Corp Methode zum optischen Abtasten eines Signals aus einem magneto-optischen Speichermedium.
JPH01149246A (ja) * 1987-12-04 1989-06-12 Sony Corp 光磁気記録媒体
JP2708531B2 (ja) * 1989-03-07 1998-02-04 パイオニア株式会社 ディスクプレーヤ
US5168482A (en) * 1989-08-31 1992-12-01 Sony Corporation Magnetooptical recording and playback method employing multi-layer recording medium with record holding layer and playback layer
JP2910082B2 (ja) * 1989-08-31 1999-06-23 ソニー株式会社 光磁気記録再生方法
JPH0487069A (ja) * 1990-07-31 1992-03-19 Sony Corp 光ディスク記録装置
JPH04105284A (ja) * 1990-08-24 1992-04-07 Sony Corp 光ディスク記録及び／又は再生装置
JP2910250B2 (ja) * 1990-12-27 1999-06-23 ソニー株式会社 光磁気記録媒体
JP2969963B2 (ja) * 1990-12-28 1999-11-02 ソニー株式会社 光磁気記録媒体における信号再生方法
EP0536404B1 (de) * 1991-02-05 1996-05-08 Sony Corporation Verfahren zur wiedergabe eines signals aus einem optischen aufzeichnungsmedium
DE69119414T2 (de) * 1991-02-05 1997-01-02 Sony Corp Verfahren zur Wiedergabe eines Signals aus einem optischen Aufzeichnungsmedium
CA2060547C (en) * 1991-02-08 2002-04-23 Masumi Ohta System and method of reproducing signals recorded on a magneto-optic recording medium
DE29617991U1 (de) * 1996-10-16 1996-11-28 Drebo Werkzeugfab Gmbh Bohrervorsatz

Also Published As

Publication number Publication date
EP0498459A2 (de) 1992-08-12
DE69225159T2 (de) 1998-08-13
DE69231042D1 (de) 2000-06-15
EP0747896A1 (de) 1996-12-11
DE69231042T2 (de) 2000-09-28
EP0747896B1 (de) 2000-05-10
EP0498459A3 (en) 1993-10-13
US5579294A (en) 1996-11-26
EP0498459B1 (de) 1998-04-22

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Legal Events

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8364 No opposition during term of opposition
8320 Willingness to grant licences declared (paragraph 23)