BR0002481A - Aparelho e processo de ajustamento de saìda ótica - Google Patents

Aparelho e processo de ajustamento de saìda ótica

Info

Publication number
BR0002481A
BR0002481A BR0002481-3A BR0002481A BR0002481A BR 0002481 A BR0002481 A BR 0002481A BR 0002481 A BR0002481 A BR 0002481A BR 0002481 A BR0002481 A BR 0002481A
Authority
BR
Brazil
Prior art keywords
recording mark
output
reference voltage
reproduction
level
Prior art date
Application number
BR0002481-3A
Other languages
English (en)
Inventor
Keiichi Tsutsui
Yasuyuki Takeshita
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
Application filed by Sony Corp filed Critical Sony Corp
Publication of BR0002481A publication Critical patent/BR0002481A/pt

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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
    • G11B7/1263—Power control during transducing, e.g. by monitoring
    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
    • 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
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10305—Improvement or modification of read or write signals signal quality assessment
    • G11B20/10314—Improvement or modification of read or write signals signal quality assessment amplitude of the recorded or reproduced signal
    • 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
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2525—Magneto-optical [MO] discs

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Optical Head (AREA)
  • Semiconductor Lasers (AREA)

Abstract

"APARELHO E PROCESSO DE AJUSTAMENTO DE SAìDA óTICA''. Uma saída de laser de reprodução pode ser ajustada para um nível ótimo. Com esta finalidade, um dispositivo disco magnético ótico 1 compreende um amplificador diferencial 23 e um identificador de marca de gravação mais curta 33 que detecta um sinal de reprodução de marca de gravação mais curta que corresponde a um componente de uma marca de gravação mais curta em um sinal de reprodução obtido reproduzindo um disco magnético ótico 100, um detetor de envoltória 33 que detecta o nível de amplitude do sinal de reprodução da marca de gravação mais curta, um comparador 35 que compara o nível de amplitude com uma voltagem de referência que é saída da fonte de voltagem de referência 34, e uma seção de controle de acionamento 30, que ajusta o feixe de laser de reprodução para um nível de saída no qual o nível de amplitude é igual a ou maior que a voltagem de referência, com base em um resultado de comparação do comparador 35.
BR0002481-3A 1999-05-19 2000-05-19 Aparelho e processo de ajustamento de saìda ótica BR0002481A (pt)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11139169A JP2000331397A (ja) 1999-05-19 1999-05-19 光出力調整装置及び光出力調整方法

Publications (1)

Publication Number Publication Date
BR0002481A true BR0002481A (pt) 2001-01-02

Family

ID=15239193

Family Applications (1)

Application Number Title Priority Date Filing Date
BR0002481-3A BR0002481A (pt) 1999-05-19 2000-05-19 Aparelho e processo de ajustamento de saìda ótica

Country Status (13)

Country Link
US (2) US6552967B1 (pt)
EP (1) EP1056079A3 (pt)
JP (1) JP2000331397A (pt)
KR (2) KR100717657B1 (pt)
CN (1) CN1305056C (pt)
AU (1) AU768696B2 (pt)
BR (1) BR0002481A (pt)
CA (1) CA2308427A1 (pt)
ID (1) ID26057A (pt)
MX (1) MXPA00004857A (pt)
MY (2) MY138423A (pt)
SG (1) SG92704A1 (pt)
TW (1) TW468149B (pt)

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US6983829B2 (en) 2001-01-16 2006-01-10 Delphi Technologies, Inc. Motor actuated park brake for a vehicle
US6802398B2 (en) 2001-01-16 2004-10-12 Delphi Technologies, Inc. Manual cable release apparatus for a motor actuated park brake for a vehicle
JP2002216403A (ja) * 2001-01-16 2002-08-02 Canon Inc 光磁気ディスクのアニール方法、及び光磁気ディスク
JP4451004B2 (ja) * 2001-02-28 2010-04-14 シャープ株式会社 光再生装置
JP3858613B2 (ja) * 2001-03-23 2006-12-20 ティアック株式会社 光ディスク装置
WO2003023767A2 (en) * 2001-09-12 2003-03-20 Koninklijke Philips Electronics N.V. Radiation power and/or field control for domain expansion recording medium
JP2003317344A (ja) * 2002-04-26 2003-11-07 Canon Inc 光磁気記録方法、及び光磁気記録装置
US7295500B2 (en) * 2002-09-30 2007-11-13 Nec Corporation Recording condition setting method and information recorder using same
US20040081042A1 (en) * 2002-10-23 2004-04-29 Matsushita Electric Industrial Co., Ltd. Optical disc drive
JP2005159000A (ja) * 2003-11-26 2005-06-16 Sony Corp 半導体レーザ
KR100596005B1 (ko) * 2004-11-30 2006-07-05 한국전자통신연구원 복조 회로
US20060250918A1 (en) * 2005-05-06 2006-11-09 Chih-Chin Hsu High frequency modulation of a light beam in optical recording
WO2007004129A1 (en) * 2005-06-30 2007-01-11 Koninklijke Philips Electronics, N.V. Laser power algorithm for low power applications
JP2009544110A (ja) * 2006-07-17 2009-12-10 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 高い複屈折性をもつ光キャリアを再生可能な光ドライブ
US8238319B2 (en) * 2006-09-01 2012-08-07 Advanced Telecommunications Research Institute International Radio apparatus
JP2010086581A (ja) * 2008-09-30 2010-04-15 Hitachi Ltd 情報記録媒体および光記録再生装置

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JP2812441B2 (ja) 1988-10-11 1998-10-22 キヤノン株式会社 光学的情報記録再生装置
JP2959586B2 (ja) 1991-02-12 1999-10-06 ソニー株式会社 光磁気ディスクの再生方法
JP2795567B2 (ja) 1991-11-25 1998-09-10 シャープ株式会社 光磁気ディスク及び再生方法
JPH05166188A (ja) * 1991-12-19 1993-07-02 Nec Eng Ltd 光磁気ディスク装置
EP0618572B1 (en) * 1993-04-02 2002-07-03 Canon Kabushiki Kaisha Magnetooptical recording medium on which high-density information can be recorded and method of reproducing the recorded information
JP3332458B2 (ja) 1993-04-02 2002-10-07 キヤノン株式会社 光磁気記録媒体
US5537381A (en) * 1993-09-02 1996-07-16 Sharp Kabushiki Kaisha Test-writing recording control method and test-writing recording control apparatus and optical recording medium
ES2161240T3 (es) 1993-11-17 2001-12-01 Canon Kk Aparato de grabacion/reproduccion optica de informacion y metodo con funcion de ajuste de la potencia de reproduccion.
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
JP3355043B2 (ja) * 1994-08-29 2002-12-09 シャープ株式会社 光磁気記録媒体の記録再生装置
US5726954A (en) * 1995-04-10 1998-03-10 Nikon Corporation Optical recording method and apparatus
JPH08335323A (ja) * 1995-06-07 1996-12-17 Matsushita Electric Ind Co Ltd 光学的情報記録再生装置
JPH09102147A (ja) * 1995-10-05 1997-04-15 Sony Corp デイスク記録装置
JPH09161301A (ja) * 1995-12-08 1997-06-20 Olympus Optical Co Ltd 光学的情報再生装置
US5808972A (en) * 1995-12-28 1998-09-15 Nikon Corporation Stabilized overwriteable optical recording method using laser beam intensity settings
JPH1092037A (ja) 1996-09-19 1998-04-10 Canon Inc 光磁気記録再生方法及び光磁気記録再生装置
JPH1092047A (ja) * 1996-09-19 1998-04-10 Canon Inc 光学的情報記録再生方法と光学的情報記録再生装置
JPH10334534A (ja) * 1997-05-28 1998-12-18 Canon Inc 光磁気記録再生方法及び光磁気記録再生装置
EP0887790B1 (en) * 1997-06-24 2011-05-04 Sharp Kabushiki Kaisha Optical reproducing device and optical memory system comprising the device and a medium
US6125085A (en) * 1997-07-02 2000-09-26 Sharp Kabushiki Kaisha Optical recording method and device for optimally controlling the width of the recording marks
US6392970B1 (en) * 1997-08-04 2002-05-21 Sharp Kabushiki Kaisha Reproducing light quantity control method for optical memory device, and reproducing light quantity control device, and optical recording medium
JPH1196609A (ja) * 1997-09-18 1999-04-09 Canon Inc 光磁気情報再生装置
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US6385141B1 (en) * 1999-01-07 2002-05-07 Hitachi Maxell Ltd. Magneto-optical recording method capable of adjusting the sizes magnetic domain

Also Published As

Publication number Publication date
TW468149B (en) 2001-12-11
CA2308427A1 (en) 2000-11-19
MY138423A (en) 2009-06-30
KR100717657B1 (ko) 2007-05-15
MXPA00004857A (es) 2002-03-08
US6552967B1 (en) 2003-04-22
KR20060132772A (ko) 2006-12-22
MY127064A (en) 2006-11-30
AU3251700A (en) 2000-11-23
AU768696B2 (en) 2004-01-08
US20030117905A1 (en) 2003-06-26
CN1305056C (zh) 2007-03-14
EP1056079A3 (en) 2002-11-06
KR20000077316A (ko) 2000-12-26
JP2000331397A (ja) 2000-11-30
SG92704A1 (en) 2002-11-19
KR100702563B1 (ko) 2007-04-04
EP1056079A2 (en) 2000-11-29
ID26057A (id) 2000-11-23
US6744700B2 (en) 2004-06-01
CN1274917A (zh) 2000-11-29

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Legal Events

Date Code Title Description
B08F Application dismissed because of non-payment of annual fees [chapter 8.6 patent gazette]

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

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 2069 DE 31/08/2010.