BR9600862A - Aparelho para controlar a magnitude de um campo magnético no ponto focal de uma lente - Google Patents

Aparelho para controlar a magnitude de um campo magnético no ponto focal de uma lente

Info

Publication number
BR9600862A
BR9600862A BR9600862A BR9600862A BR9600862A BR 9600862 A BR9600862 A BR 9600862A BR 9600862 A BR9600862 A BR 9600862A BR 9600862 A BR9600862 A BR 9600862A BR 9600862 A BR9600862 A BR 9600862A
Authority
BR
Brazil
Prior art keywords
current
controller
driver
bias
magnetic field
Prior art date
Application number
BR9600862A
Other languages
English (en)
Inventor
David Earl Lewis
Original Assignee
Discovision Ass
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 Discovision Ass filed Critical Discovision Ass
Publication of BR9600862A publication Critical patent/BR9600862A/pt

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
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F7/00—Regulating magnetic variables
    • 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
    • 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
    • G11B11/1055—Disposition or mounting of transducers relative to record carriers

Landscapes

  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Physics & Mathematics (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Control Of Ac Motors In General (AREA)
  • Selective Calling Equipment (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Hard Magnetic Materials (AREA)
BR9600862A 1995-04-07 1996-02-29 Aparelho para controlar a magnitude de um campo magnético no ponto focal de uma lente BR9600862A (pt)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/418,965 US5666333A (en) 1995-04-07 1995-04-07 Biasing level controller for magneto-optical recording device

Publications (1)

Publication Number Publication Date
BR9600862A true BR9600862A (pt) 1997-12-30

Family

ID=23660260

Family Applications (2)

Application Number Title Priority Date Filing Date
BR9612810-0A BR9612810A (pt) 1995-04-07 1996-02-29 Aparelho e processo para controlar uma intensidade de campo magnético de uma bobina polarizadora em um ponto focal de uma lente durante a gravação sobre um meio, e, sistema de armazenamento ótico.
BR9600862A BR9600862A (pt) 1995-04-07 1996-02-29 Aparelho para controlar a magnitude de um campo magnético no ponto focal de uma lente

Family Applications Before (1)

Application Number Title Priority Date Filing Date
BR9612810-0A BR9612810A (pt) 1995-04-07 1996-02-29 Aparelho e processo para controlar uma intensidade de campo magnético de uma bobina polarizadora em um ponto focal de uma lente durante a gravação sobre um meio, e, sistema de armazenamento ótico.

Country Status (17)

Country Link
US (2) US5666333A (pt)
EP (2) EP0817183B1 (pt)
JP (2) JPH08321090A (pt)
KR (2) KR100318176B1 (pt)
CN (2) CN1138192A (pt)
AT (1) ATE229687T1 (pt)
AU (1) AU721725B2 (pt)
BR (2) BR9612810A (pt)
CA (1) CA2169592C (pt)
DE (1) DE69625342T2 (pt)
ID (1) ID23024A (pt)
IL (1) IL117744A (pt)
MY (1) MY113235A (pt)
NO (1) NO960585L (pt)
RU (1) RU2182721C2 (pt)
SG (2) SG46579A1 (pt)
TW (1) TW288106B (pt)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4105407B2 (ja) * 2001-06-15 2008-06-25 富士通株式会社 磁界印加装置用コイル駆動回路及び情報記憶装置並びに磁界印加装置用コイル駆動制御方法
US6911904B2 (en) * 2002-09-03 2005-06-28 Lear Corporation System and method for adaptive variable magnetic field generator
TW200820571A (en) * 2006-10-27 2008-05-01 Fitipower Integrated Tech Inc Driving device
DE102018127394A1 (de) * 2018-11-02 2020-05-07 Bernd Burchard Vorrichtung und Verfahren zur Erzeugung und Regelung einer magnetischen Feldstärke

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2632438A1 (fr) * 1988-06-07 1989-12-08 Philips Nv Enregistreur magneto-optique a champ magnetique module
JPH065562B2 (ja) * 1988-07-20 1994-01-19 シャープ株式会社 光磁気記録再生装置の外部磁界装置
US5343448A (en) * 1988-07-20 1994-08-30 Sharp Kabushiki Kaiasha External magnetic field device for a magnetooptical information recording and reproducing apparatus
JPH065563B2 (ja) * 1988-10-28 1994-01-19 株式会社日立製作所 発生磁界制御方式
DE3838858A1 (de) * 1988-11-17 1990-05-23 Thomson Brandt Gmbh Schaltungsanordnung zur umkehrung eines magnetfeldes
US5179544A (en) * 1989-03-28 1993-01-12 U.S. Philips Corporation Control system for the magnetic head of a magneto-optical disc apparatus
US5172364A (en) * 1989-08-01 1992-12-15 Mitsubishi Denki Kabushiki Kaisha Magneto-optic recording apparatus with controlled magnetic field generation
US5159584A (en) * 1989-08-15 1992-10-27 Olympus Optical Company Limited Bias-Magnetic field generating system of photo-magnetic recording device
NL8902293A (nl) * 1989-09-14 1991-04-02 Philips Nv Werkwijze en inrichting voor het inschrijven en uitlezen van een magneto-optische registratiedrager.
JPH03134803A (ja) * 1989-10-20 1991-06-07 Canon Inc 光磁気記録装置
JPH07118106B2 (ja) * 1990-03-08 1995-12-18 パイオニア株式会社 光磁気記録再生装置
JPH03272039A (ja) * 1990-03-20 1991-12-03 Canon Inc 光磁気記録装置
US5485435A (en) * 1990-03-20 1996-01-16 Canon Kabushiki Kaisha Magnetic field generator in which an end face of a magnetic material member projects from man end face of magnetic field generating cores
JPH03276402A (ja) * 1990-03-27 1991-12-06 Matsushita Electric Ind Co Ltd 光磁気ディスク装置用バイアス磁界発生装置
NL9001546A (nl) * 1990-07-06 1992-02-03 Philips Nv Inrichting voor het inschrijven en/of uitlezen van een magneto-optische informatiedrager.
US5404342A (en) * 1992-01-16 1995-04-04 Sony Corporation Magnetic head device for magneto-optical disc system and magnetic head driving circuit
US5392273A (en) * 1992-02-28 1995-02-21 Fujitsu Limited Optical storage drive controller with predetermined light source drive values stored in non-volatile memory
US5481510A (en) * 1992-02-28 1996-01-02 Fujitsu Limited Seek control system for optical storage apparatus
JP3188339B2 (ja) * 1992-03-06 2001-07-16 キヤノン株式会社 磁気ヘッド駆動装置および光磁気記録装置
JP3139723B2 (ja) * 1992-05-15 2001-03-05 キヤノン株式会社 光磁気記録装置
JP3098896B2 (ja) * 1992-06-23 2000-10-16 キヤノン株式会社 光磁気記録装置
JPH0668402A (ja) * 1992-08-21 1994-03-11 Canon Inc 光磁気記録装置
JP3199517B2 (ja) * 1993-05-27 2001-08-20 オリンパス光学工業株式会社 光磁気記録用磁気ヘッド駆動装置

Also Published As

Publication number Publication date
CN1138192A (zh) 1996-12-18
EP0817183B1 (en) 2002-12-11
ID23024A (id) 1996-10-24
CA2169592A1 (en) 1996-10-08
CA2169592C (en) 2007-04-10
JPH08321090A (ja) 1996-12-03
AU721725B2 (en) 2000-07-13
NO960585L (no) 1996-10-08
US5721714A (en) 1998-02-24
US5666333A (en) 1997-09-09
KR960038778A (ko) 1996-11-21
BR9612810A (pt) 1999-11-09
TW288106B (pt) 1996-10-11
IL117744A0 (en) 1996-07-23
ATE229687T1 (de) 2002-12-15
DE69625342T2 (de) 2003-04-24
CN1214505A (zh) 1999-04-21
DE69625342D1 (de) 2003-01-23
EP0817183A2 (en) 1998-01-07
AU4810896A (en) 1996-10-17
EP0817183A3 (en) 1998-02-11
SG87001A1 (en) 2002-03-19
NO960585D0 (no) 1996-02-14
IL117744A (en) 2001-09-13
JP2003109259A (ja) 2003-04-11
EP0736867A1 (en) 1996-10-09
SG46579A1 (en) 1998-02-20
KR100318176B1 (ko) 2002-04-22
KR100321564B1 (ko) 2002-05-09
RU2182721C2 (ru) 2002-05-20
MY113235A (en) 2001-12-31
CN1163883C (zh) 2004-08-25

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Legal Events

Date Code Title Description
FB34 Technical and formal requirements: requirement - article 34 of industrial property law
B08F Application dismissed because of non-payment of annual fees [chapter 8.6 patent gazette]

Free format text: REFERENTE A 9A E 10A ANUIFDADES.

B08K Patent lapsed as no evidence of payment of the annual fee has been furnished to inpi [chapter 8.11 patent gazette]

Free format text: REFERENTE AO DESPACHO 8.6 PUBLICADO NA RPI 1860 DE 29/08/2006.