SG46579A1 - Method and apparatus for controlling bias levels - Google Patents

Method and apparatus for controlling bias levels

Info

Publication number
SG46579A1
SG46579A1 SG1996006138A SG1996006138A SG46579A1 SG 46579 A1 SG46579 A1 SG 46579A1 SG 1996006138 A SG1996006138 A SG 1996006138A SG 1996006138 A SG1996006138 A SG 1996006138A SG 46579 A1 SG46579 A1 SG 46579A1
Authority
SG
Singapore
Prior art keywords
current
controller
driver
bias
digital signal
Prior art date
Application number
SG1996006138A
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 SG46579A1 publication Critical patent/SG46579A1/en

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 Motors That Do Not Use Commutators (AREA)
  • Control Of Ac Motors In General (AREA)
  • Selective Calling Equipment (AREA)
  • Hard Magnetic Materials (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
SG1996006138A 1995-04-07 1996-02-27 Method and apparatus for controlling bias levels SG46579A1 (en)

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
SG46579A1 true SG46579A1 (en) 1998-02-20

Family

ID=23660260

Family Applications (2)

Application Number Title Priority Date Filing Date
SG9801477A SG87001A1 (en) 1995-04-07 1996-02-27 Method and apparatus for controlling bias levels in a magneto-optical recording device
SG1996006138A SG46579A1 (en) 1995-04-07 1996-02-27 Method and apparatus for controlling bias levels

Family Applications Before (1)

Application Number Title Priority Date Filing Date
SG9801477A SG87001A1 (en) 1995-04-07 1996-02-27 Method and apparatus for controlling bias levels in a magneto-optical recording device

Country Status (17)

Country Link
US (2) US5666333A (zh)
EP (2) EP0736867A1 (zh)
JP (2) JPH08321090A (zh)
KR (2) KR100318176B1 (zh)
CN (2) CN1163883C (zh)
AT (1) ATE229687T1 (zh)
AU (1) AU721725B2 (zh)
BR (2) BR9600862A (zh)
CA (1) CA2169592C (zh)
DE (1) DE69625342T2 (zh)
ID (1) ID23024A (zh)
IL (1) IL117744A (zh)
MY (1) MY113235A (zh)
NO (1) NO960585L (zh)
RU (1) RU2182721C2 (zh)
SG (2) SG87001A1 (zh)
TW (1) TW288106B (zh)

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
US5481510A (en) * 1992-02-28 1996-01-02 Fujitsu Limited Seek control system for optical storage apparatus
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
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
KR100318176B1 (ko) 2002-04-22
SG87001A1 (en) 2002-03-19
ID23024A (id) 1996-10-24
EP0817183A3 (en) 1998-02-11
BR9612810A (pt) 1999-11-09
CA2169592C (en) 2007-04-10
EP0817183A2 (en) 1998-01-07
NO960585D0 (no) 1996-02-14
NO960585L (no) 1996-10-08
AU4810896A (en) 1996-10-17
DE69625342T2 (de) 2003-04-24
JP2003109259A (ja) 2003-04-11
KR960038778A (ko) 1996-11-21
TW288106B (zh) 1996-10-11
CN1163883C (zh) 2004-08-25
US5721714A (en) 1998-02-24
EP0817183B1 (en) 2002-12-11
CN1138192A (zh) 1996-12-18
US5666333A (en) 1997-09-09
KR100321564B1 (ko) 2002-05-09
MY113235A (en) 2001-12-31
CA2169592A1 (en) 1996-10-08
AU721725B2 (en) 2000-07-13
BR9600862A (pt) 1997-12-30
IL117744A0 (en) 1996-07-23
DE69625342D1 (de) 2003-01-23
ATE229687T1 (de) 2002-12-15
RU2182721C2 (ru) 2002-05-20
JPH08321090A (ja) 1996-12-03
EP0736867A1 (en) 1996-10-09
CN1214505A (zh) 1999-04-21
IL117744A (en) 2001-09-13

Similar Documents

Publication Publication Date Title
JPS576444A (en) Objective lens driving device
ATE170623T1 (de) Positionsdetektor
EP0869381A3 (en) Lens driving control apparatus and method
IL117744A0 (en) Method and apparatus for controlling bias levels
EP1056079A3 (en) Optical output adjustment apparatus and optical output adjustment method
AU3604789A (en) Magneto-optical recorder with magnetic-field modulation
US5931876A (en) Tracking control circuit for automatic guide vehicle
EP0828384A3 (en) Controlling the movable lens of an image pickup apparatus
EP0777220A3 (en) Objects-lens driving device for optical pickup
KR100498979B1 (ko) 전압 감도와 위상 제어할 수 있는 액추에이터 및 이를구비한 광픽업
ATE171020T1 (de) Vorrichtung zur regelung eines aufzugmotors
EP0603051A3 (fr) Dispositif de pilotage de hacheur
JPH10275340A (ja) フォーカス制御装置
EP0495267A3 (en) Apparatus for checking coins or similar metal discs
JPH06311771A (ja) ボイスコイルモータの制御装置
JPS6437782A (en) Method for pulling-in tracking servo of information recording and reproducing device
JPS63127401A (ja) バイアス磁界発生装置