CA2073924A1 - Magneto-optical recording method using a magneto-optical recording medium having two or more magnetic layers to allow recording and reproduction to be effected simultaneously and magneto-optical recording medium used in the method - Google Patents

Magneto-optical recording method using a magneto-optical recording medium having two or more magnetic layers to allow recording and reproduction to be effected simultaneously and magneto-optical recording medium used in the method

Info

Publication number
CA2073924A1
CA2073924A1 CA2073924A CA2073924A CA2073924A1 CA 2073924 A1 CA2073924 A1 CA 2073924A1 CA 2073924 A CA2073924 A CA 2073924A CA 2073924 A CA2073924 A CA 2073924A CA 2073924 A1 CA2073924 A1 CA 2073924A1
Authority
CA
Canada
Prior art keywords
magneto
optical recording
recording medium
magnetic layer
reproduction
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.)
Granted
Application number
CA2073924A
Other languages
French (fr)
Other versions
CA2073924C (en
Inventor
Tadashi Kobayashi
Koyo Hasegawa
Kazuoki Hongu
Masakuni Yamamoto
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.)
Canon Inc
Original Assignee
Individual
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 JP3175159A external-priority patent/JPH0520720A/en
Priority claimed from JP3218446A external-priority patent/JPH0554452A/en
Priority claimed from JP04018451A external-priority patent/JP3077848B2/en
Application filed by Individual filed Critical Individual
Publication of CA2073924A1 publication Critical patent/CA2073924A1/en
Application granted granted Critical
Publication of CA2073924C publication Critical patent/CA2073924C/en
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
    • G11B11/10502—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
    • G11B11/10504—Recording
    • G11B11/10508—Recording by modulating only the magnetic field at the transducer
    • 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

Abstract

A magneto-optical recording method employs a magneto-optical recording medium having a first magnetic layer which exhibits low coercive force at room temper-ature and high Curie temperature and a second magnetic layer which is exchange-coupled to the first magnetic layer and which exhibits a higher coercive force and a lower Curie temperature as compared with those of the first magnetic layer. A magnetic field modulated in accordance with information to be recorded is applied to the magneto-optical recording medium while irradiating it with a light beam of a constant intensity so as to record the information. The recorded information is simultaneously confirmed by using a reflected light of this light beam.
CA002073924A 1991-07-16 1992-07-15 Magneto-optical recording method using a magneto-optical recording medium having two or more magnetic layers to allow recording and reproduction to be effected simultaneously and magneto-optical recording medium used in the method Expired - Fee Related CA2073924C (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP3-175159 1991-07-16
JP3175159A JPH0520720A (en) 1991-07-16 1991-07-16 Magneto-optical recording system
JP3-218446 1991-08-29
JP3218446A JPH0554452A (en) 1991-08-29 1991-08-29 Magneto-optical recording medium
JP04018451A JP3077848B2 (en) 1992-01-08 1992-01-08 Magneto-optical recording medium, magneto-optical recording method, and magneto-optical reproducing method
JP4-18451 1992-01-08

Publications (2)

Publication Number Publication Date
CA2073924A1 true CA2073924A1 (en) 1993-01-17
CA2073924C CA2073924C (en) 1997-03-04

Family

ID=27282213

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002073924A Expired - Fee Related CA2073924C (en) 1991-07-16 1992-07-15 Magneto-optical recording method using a magneto-optical recording medium having two or more magnetic layers to allow recording and reproduction to be effected simultaneously and magneto-optical recording medium used in the method

Country Status (5)

Country Link
US (1) US5428586A (en)
EP (2) EP0523944A3 (en)
KR (1) KR960016891B1 (en)
AU (1) AU660315B2 (en)
CA (1) CA2073924C (en)

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05144114A (en) * 1991-11-19 1993-06-11 Canon Inc Magneto-optical recorder
JP2957367B2 (en) * 1993-01-07 1999-10-04 シャープ株式会社 Magneto-optical recording medium, recording method and recording / reproduction method
JPH06223427A (en) * 1993-01-29 1994-08-12 Sharp Corp Magneto-optical recording medium and reproducing method therefor
JP3287648B2 (en) * 1993-06-07 2002-06-04 株式会社リコー Simultaneous recording verification method for phase change type information recording medium and phase change type information recording drive device
JP3375694B2 (en) * 1993-07-19 2003-02-10 パイオニア株式会社 Magneto-optical disk and magneto-optical disk reproducing device
US5596555A (en) * 1993-07-29 1997-01-21 Canon Kabushiki Kaisha Magnetooptical recording medium having magnetic layers that satisfy predetermined coercive force relationships, and recording/reproduction method for the medium
EP0673030A4 (en) * 1993-10-06 1996-02-21 Nippon Kogaku Kk Optical disk recording device.
JP3333613B2 (en) * 1993-12-07 2002-10-15 株式会社日立製作所 Optical information recording medium, optical information recording / reproducing method, and optical information recording / reproducing apparatus
CA2142767C (en) * 1994-02-21 1998-11-17 Naoki Nishimura Magneto-optical recording medium, and information reproducing method using the medium
JPH07244876A (en) * 1994-03-01 1995-09-19 Sharp Corp Magneto-optic recording medium and magneto-optically recording/reproducing method
JPH07254175A (en) * 1994-03-16 1995-10-03 Canon Inc Magneto-optical recording medium and method for recording and reproducing information with same medium
JPH07320320A (en) * 1994-05-24 1995-12-08 Sharp Corp Magneto-optical recording medium, recording and reproducing method of magneto-optically recorded information
US5414678A (en) * 1994-09-02 1995-05-09 Minnesota Mining And Manufacturing Company Magneto-optic recording medium having two recording layers, and drive for same
JP2950181B2 (en) * 1995-02-16 1999-09-20 日本電気株式会社 Magneto-optical disk recording device
JP2783179B2 (en) * 1995-02-27 1998-08-06 日本電気株式会社 Optical information recording / reproducing method and recording / reproducing apparatus
EP0735532A3 (en) * 1995-03-28 1997-10-01 Nippon Kogaku Kk Optical recording method and control
US6423430B1 (en) * 1995-07-17 2002-07-23 Samsung Electronics Co., Ltd. Magneto-optical recording medium for short wavelength
US5968678A (en) * 1995-08-31 1999-10-19 Sanyo Electric., Ltd. Magneto-optical recording medium and manufacturing method thereof
JP2812266B2 (en) * 1995-10-19 1998-10-22 日本電気株式会社 Magneto-optical disk recording apparatus and magneto-optical disk recording method
DE69735074T2 (en) * 1996-08-27 2006-08-03 Matsushita Electric Industrial Co., Ltd., Kadoma Magneto-optical recording medium and associated reading method
JPH1092046A (en) * 1996-09-19 1998-04-10 Canon Inc Magnetooptical information reproducing device
JPH1092037A (en) * 1996-09-19 1998-04-10 Canon Inc Magnetooptical recording and reproducing method and device therefor
JPH10275369A (en) 1997-01-31 1998-10-13 Canon Inc Manufacture of information recording medium and information recording medium made by the same
JPH11134732A (en) 1997-08-29 1999-05-21 Canon Inc Information recording/reproducing method
JP3703315B2 (en) * 1997-10-01 2005-10-05 キヤノン株式会社 Magneto-optical recording and reproducing method and reproducing apparatus therefor
US6298015B1 (en) 1998-06-03 2001-10-02 Canon Kabushiki Kaisha Magneto-optical reproducing method using a magnified magnetic domain
JP2001023259A (en) 1999-07-09 2001-01-26 Sony Corp Magneto-optical recording medium and its production
CN1554086A (en) * 2001-09-12 2004-12-08 �ʼҷ����ֵ��ӹɷ����޹�˾ Radiation power and/or field control for domain expansion recording medium
JP3938075B2 (en) * 2003-03-11 2007-06-27 ヤマハ株式会社 Optical disc recording method and optical disc recording apparatus
JP2005346843A (en) * 2004-06-03 2005-12-15 Canon Inc Optical information recording and reproducing method and device
US7599272B2 (en) * 2004-11-22 2009-10-06 Canon Kabushiki Kaisha Method and apparatus for recording and reproducing multi-level information
US7804754B2 (en) 2005-08-31 2010-09-28 Canon Kabushiki Kaisha Optical information recording/reproducing method

Family Cites Families (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06105509B2 (en) * 1985-05-31 1994-12-21 キヤノン株式会社 Magneto-optical recording / reproducing device
US4694358A (en) * 1985-10-28 1987-09-15 Kerdix, Inc. Magneto-optic recording structure and method
JPS62137754A (en) * 1985-12-09 1987-06-20 Canon Inc Photomagnetic recording and reproducing system and photomagnetic memory medium used to said recording and reproducing system
EP0258978B1 (en) * 1986-07-08 1998-10-07 Canon Kabushiki Kaisha Magnetooptical recording medium allowing overwriting with two or more magnetic layers and recording method utilizing the same
US4883710A (en) * 1986-10-28 1989-11-28 Ricoh Company, Ltd. Magneto-optical recording medium
JPH0782674B2 (en) * 1986-11-06 1995-09-06 キヤノン株式会社 Magneto-optical memory medium
JPH01165056A (en) * 1987-09-21 1989-06-29 Sharp Corp Optical information recording and reproducing device
DE3885992T2 (en) * 1987-09-22 1994-06-09 Hitachi Maxell Optical information recording / reproducing device.
JPH01149246A (en) * 1987-12-04 1989-06-12 Sony Corp Magneto-optical recording medium
JPH01217744A (en) * 1988-02-24 1989-08-31 Toshiba Corp Magneto-optical recording medium
CA1326547C (en) * 1988-07-13 1994-01-25 Masahiko Kaneko Thermomagnetic recording method
JPH0278042A (en) * 1988-09-14 1990-03-19 Mitsubishi Electric Corp Magneto-optical recording medium and device used for this medium
KR900008471A (en) * 1988-11-07 1990-06-04 미다 가쓰시게 Magneto-optical disk
US5163031A (en) * 1988-12-07 1992-11-10 Canon Kabushiki Kaisha Method of recording tetra-value signal on magneto-optical recording medium with plural magnetic layers
JPH02201756A (en) * 1989-01-31 1990-08-09 Seiko Epson Corp Magneto-optical recording medium
JPH0373448A (en) * 1989-05-10 1991-03-28 Ricoh Co Ltd Magneto-optical recording method
JPH0386955A (en) * 1989-06-09 1991-04-11 Ricoh Co Ltd Recording/erasing confirming method for magneto-optical recording system
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
US6200673B1 (en) * 1989-11-13 2001-03-13 Hitachi, Ltd. Magneto-optical recording medium
CA2026740C (en) * 1989-11-20 1995-08-29 Morovat Tayefeh Sensing previously-recorded information while recording or erasing a magnetooptic storage number
JPH03189929A (en) * 1989-12-20 1991-08-19 Hitachi Maxell Ltd Magnetic card and recording and reproducing method thereof
JP2574911B2 (en) * 1990-01-10 1997-01-22 シャープ株式会社 Magneto-optical recording method
JP3412163B2 (en) * 1991-05-24 2003-06-03 松下電器産業株式会社 Magneto-optical disk drive
NL9101796A (en) * 1991-10-25 1993-05-17 Nederland Ptt METHOD FOR AUTHENTICATING COMMUNICATION PARTICIPANTS, METHOD FOR USING THE METHOD AND FIRST COMMUNICATION PARTICIPANT AND SECOND COMMUNICATION PARTICIPANT FOR USE IN THE SYSTEM.
JPH06103622A (en) * 1992-09-18 1994-04-15 Nikon Corp Overwritable magneto-optical recording medium having r layer

Also Published As

Publication number Publication date
EP0818783A3 (en) 1999-04-14
AU2030892A (en) 1993-01-21
AU660315B2 (en) 1995-06-22
EP0523944A2 (en) 1993-01-20
EP0523944A3 (en) 1994-02-16
KR930003043A (en) 1993-02-23
CA2073924C (en) 1997-03-04
EP0818783A2 (en) 1998-01-14
US5428586A (en) 1995-06-27
KR960016891B1 (en) 1996-12-26

Similar Documents

Publication Publication Date Title
CA2073924A1 (en) Magneto-optical recording method using a magneto-optical recording medium having two or more magnetic layers to allow recording and reproduction to be effected simultaneously and magneto-optical recording medium used in the method
US5018119A (en) Method for reproducing signal using an external magnetic field from magneto-optical recording medium having three magnetic layers
CA2100898A1 (en) Magneto-optical recording medium and method of recording and reproducingusing thereof
KR920013320A (en) Magneto-optical recording media
JP2805746B2 (en) Signal reproducing method for magneto-optical recording medium
KR100238874B1 (en) Method of reproduction from magneto-optical recording medium
CA2043995A1 (en) Magneto-optical recording/reproducing device
CA2135986A1 (en) Optical Information Recording/Reproducing Apparatus and Method with Function of Adjusting Reproducing Power
CA2060547A1 (en) System and method of reproducing signals recorded on a magneto-optic recording medium
CA2073321A1 (en) Optical head device
CA2073320A1 (en) Magneto-optical recording medium
US6122229A (en) Magneto-optically recorded data readout system
KR920017049A (en) Magneto-optical recording and playback method
CA1315880C (en) Method for reproducing signal from magneto-optical recording medium
JPS63155449A (en) Magneto-optical recording method
JPH0348582B2 (en)
CA2134927A1 (en) Magnetooptical Recording Medium Allowing Super-Resolution, and Information Reproduction Method Using the Medium
JP2604475B2 (en) Magneto-optical recording medium
JPH04219642A (en) Magneto-optical recording medium and method thereof
JPS63237237A (en) Magneto-optical recording medium and recording method
JP2796602B2 (en) Magneto-optical recording method
JP2883939B2 (en) Magneto-optical recording method
JP2555272B2 (en) Magneto-optical recording / reproducing method
CA2048499A1 (en) Magneto-optical recording device
JPH03245339A (en) Magneto-optical recording medium and recording method thereof

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed