JP4512162B2 - 光学的データ記録方法 - Google Patents
光学的データ記録方法 Download PDFInfo
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- JP4512162B2 JP4512162B2 JP2009039023A JP2009039023A JP4512162B2 JP 4512162 B2 JP4512162 B2 JP 4512162B2 JP 2009039023 A JP2009039023 A JP 2009039023A JP 2009039023 A JP2009039023 A JP 2009039023A JP 4512162 B2 JP4512162 B2 JP 4512162B2
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- 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
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
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- 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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
- G11B7/24085—Pits
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- 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
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
- G11B7/00456—Recording strategies, e.g. pulse sequences
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- 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
- G11B11/10502—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
- G11B11/10506—Recording by modulating only the light beam of 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
- G11B11/1053—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 to compensate for the magnetic domain drift or time shift
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Description
図3は本発明によるデータ記録装置の第1の実施形態を示すブロック図である。図3に示すように、データ記録装置100は、スピンドルモータ102と、光ヘッド103と、光ビーム制御部104と、サーボ部105と、再生二値化部106と、デジタル信号処理部107と、記録補償部108と、CPU109とを備える。
第1の実施形態において説明したように、2nTおよび(2n+1)Tの記録パルス列、あるいは、(2n−1)Tおよび2nTの記録パルス列におけるマルチパルス列中のパルスの数を等しくすることにより、これら2つの記録パルス列のレーザ照射パワーが異なる可能性がある。これはマルチパルス列におけるマーク/スペースのデューティあるいは平均値が異なるからである。
グTELPで決定される。記録マーク15の終端位置23は、一つ後ろの記録マークからの熱干渉により前後し、これにより再生信号17は図19中の矢印24で示すように変化する。
LSP=2T−TMP−TSMP ・・・(40)
LSP=2T−TSMP−TMP ・・・(42)
従って、TMP=2T・MPD ・・・(44)
FSP=3T−TEFP+TSMP(奇数nTの場合)
LSP=2T−TMP−TSMP ・・・(45)
TSMP=(TEFP−TMP−1T)/2 (奇数nTの場合)
・・・(46)
(nT−2T−TEFP−FSP−LSP) ・・・(47)
(偶数nTの場合)
TMP=MPM・(nT−7)/[INT{(nT−4)/2)}−MPM]
(奇数nTの場合)
・・・(48)
FSP=3T−TEFP+TSMP(奇数nTの場合)
LSP=2T−TMP−TSMP ・・・(49)
TSMP=(TEFP−TMP−1T)/2 (奇数nTの場合) ・・・・(50)
(nT−2T−TEFP) ・・・(51)
INT{(nT−4)/2)} ・・(52)
FSP=LSP=0.75T
TMP=1.0T
TSMP=0.25T
奇数nTの場合:
FSP=LSP=1.25T
TMP=1.0T
TSMP=−0.25T
18、201、301 ファーストパルス
19、202、302 マルチパルス
20、203、303 ラストパルス
34 基準クロック長
100 データ記録装置
101 光ディスク
102 スピンドルモータ
103 光ヘッド
104 光ビーム制御部
105 サーボ部
106 再生二値化部
107 デジタル信号処理部
108 記録補償部
109 CPU
110 ホストPC
TEFP ファーストパルス立ち下がりタイミング
TSLP ラストパルス立ち上がりタイミング
TMP マルチパルス幅
TSMP マルチパルス列の立ち上がりタイミング
FSP 先頭スペース幅
LSP 後尾スペース幅
Claims (2)
- 記録すべきデータを変調して複数の記録変調符号を生成し、パルス状の光ビームをデータ記録媒体に照射することによって、前記複数の記録変調符号にそれぞれ対応する長さを有する複数の記録マークおよびスペースを前記データ記録媒体に形成する光学的データ記録方法であって、
前記複数の記録マークの少なくとも2つは、先頭に配置され、前記記録マークの始端部分を形成するためのファーストパルスと、最後尾に配置され、前記記録マークの終端部分を形成するためのラストパルスと、前記ファーストパルスおよび前記ラストパルスの間に配置され、前記記録マークの中央部を形成するためのマルチパルス列とを含む記録パルス列に基づいて照射される光ビームにより形成され、
前記複数の記録マークのそれぞれは互いにTあるいはその整数倍だけ異なる長さを有し、
前記記録マークが長さにおいて2T増加するにつれて前記マルチパルス列のパルスの数は1つ増加し、
最短の記録マークは1つのパルスによって構成されており、
2番目に短い記録マークと3番目に短い記録マークはそれぞれ2つのパルスによって構成されており、
最短マークのパルス幅は、2番目に短いマークのファーストパルスのパルス幅よりも長く、
3番目に短いマークのパルス間隔は、2番目に短いマークのパルス間隔よりも長く、
p+1番目(pは2以上の偶数)に短い記録マークのファーストパルスのレーザ照射パワーは、p番目に短い記録マークのファーストパルスのレーザ照射パワーよりも大きく、
p+1番目(pは2以上の偶数)に短い記録マークのラストパルスのレーザ照射パワーは、p番目に短い記録マークのラストパルスのレーザ照射パワーよりも大きく、
q+1番目(qは4以上の偶数)に短い記録マークのファーストパルスとマルチパルス列の先頭パルスとのパルス間隔は、p番目に短い記録マークのファーストパルスとマルチパルス列の先頭パルスとのパルス間隔よりも長く、
q+1番目(qは4以上の偶数)に短い記録マークのマルチパルス列の最終パルスとラストパルスとのパルス間隔は、p番目に短い記録マークのマルチパルス列の最終パルスとラストパルスとのパルス間隔よりも長い、光学的データ記録方法。 - 記録すべきデータを変調して複数の記録変調符号を生成し、パルス状の光ビームをデータ記録媒体に照射することによって、前記複数の記録変調符号にそれぞれ対応する長さを有する複数の記録マークおよびスペースを前記データ記録媒体に形成する光学的データ記録方法であって、
前記複数の記録マークの少なくとも2つは、先頭に配置され、前記記録マークの始端部分を形成するためのファーストパルスと、最後尾に配置され、前記記録マークの終端部分を形成するためのラストパルスと、前記ファーストパルスおよび前記ラストパルスの間に配置され、前記記録マークの中央部を形成するためのマルチパルス列とを含む記録パルス列に基づいて照射される光ビームにより形成され、
前記複数の記録マークのそれぞれは互いにTあるいはその整数倍だけ異なる長さを有し、
前記記録マークが長さにおいて2T増加するにつれて前記マルチパルス列のパルスの数は1つ増加し、
最短の記録マークは1つのパルスによって構成されており、
2番目に短い記録マークと3番目に短い記録マークはそれぞれ2つのパルスによって構成されており、
最短マークのパルス幅は、2番目に短いマークのファーストパルスのパルス幅よりも長く、
最短マークのパルスのレーザ照射パワーは、2番目に短いマークのファーストパルスのレーザ照射パワーよりも小さく、
r番目(rは2以上の偶数)に短い記録マークのファーストパルスのレーザ照射パワーは、r+1番目に短い記録マークのファーストパルスのレーザ照射パワーよりも大きく、
r番目(rは2以上の偶数)に短い記録マークのラストパルスのレーザ照射パワーは、r+1番目に短い記録マークのラストパルスのレーザ照射パワーよりも大きく、
s+1番目(sは2以上の偶数)に短い記録マークのファーストパルスのパルス幅は、s番目に短い記録マークのファーストパルスのパルス幅よりも長く、
s+1番目(sは2以上の偶数)に短い記録マークのラストパルスのパルス幅は、s番目に短い記録マークのラストパルスのパルス幅よりも長い、光学的データ記録方法。
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US (7) | US7272095B2 (ja) |
EP (7) | EP2246853A1 (ja) |
JP (1) | JP4512162B2 (ja) |
KR (3) | KR101088982B1 (ja) |
AU (1) | AU2003276699A1 (ja) |
DE (4) | DE60335501D1 (ja) |
TW (2) | TW201108218A (ja) |
WO (1) | WO2004034386A1 (ja) |
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