公开(公告)号：EP1706873A2

公开(公告)日：2006-10-04

申请号：EP05702566.0

申请日：2005-01-05

申请人： Koninklijke Philips Electronics N.V.

发明人： VERSCHUREN, Coen, A. ,  COENE, Willem,. M., J., M.

IPC分类号： G11B20/14 ,  H03M5/14 ,  G11B11/105

CPC分类号： G11B7/1263 ,  G11B7/1267 ,  G11B11/1051 ,  G11B11/10515 ,  G11B11/10595 ,  G11B20/1426 ,  H03M5/145

摘要： The present invention relates to a method and apparatus for controlling at least one readout parameter of a magneto-optical domain expansion recording medium. An average detected runlength of the reading signal is monitored, and an error signal is generated on the basis of a comparison of the monitoring result with the predetermined average runlength that has been set during the encoding step. The at least one readout parameter is then controlled by means of the generated error signal. Furthermore, the present invention relates to a method, apparatus and record carrier wherein a runlength constraint is applied to at least one of the following quantities: mark regions and space regions in said storage layer, said runlength constraint being selected to keep an accumulated runlength deviation from a predetermined average runlength within a predetermined range. The proposed runlength property and control scheme provide the advantage that all detected runlengths contribute to the error signal to make the response must faster and to reduce readout errors.

公开(公告)号：EP0338827A3

公开(公告)日：1990-10-31

申请号：EP89303927.1

申请日：1989-04-20

申请人： SHARP KABUSHIKI KAISHA

发明人： Katayama, Hiroyuki ,  Ohta, Kenji ,  Nakayama, Junichiro ,  Miyake, Tomoyuki ,  Takahashi, Akira

IPC分类号： G11B11/10

CPC分类号： G11B11/1051 ,  G11B11/10515 ,  G11B11/10521 ,  G11B11/10528

摘要： A magneto-optical recording and reproducing device (12) comprising an optical head (10) provided with a laser beam source (2), focusing a laser beam onto a magneto-optical recording medium (1) with a magnetic substance film (1b) of perpendicular magnetic anisotropy, a magnetic coil (7) generating an alternating magnetic field according to data to be recorded, and forming positive magnetized parts being magnetized in a predetermined direction, and negative magnetized parts being magnetized in the opposite direction of said positive magnetized parts on said magnetic substance film of said recording medium, recording and reproducing data by existence or absence of said negative magnetized parts, characterized in that there is provided a laser beam output level control means (11) controlling intensity of said laser beam at forming said positive magnetized parts more strongly than forming said negative magnetized parts, so that the width of said positive magnetized parts becomes wider than said negative magnetized parts. Hence, this device can prevent the causes of false signals and incorrect detection influenced by a residual negative magnetized domain which is a part of the negative magnetized domain formed according to old data, when record­ed data according to the existence or absence of the nega­tive magnetized parts, that is, according to the existence or absence, length, position et cetera of the negative mag­netized domain comprising of the negative magnetized parts, is reproduced, consequently the reliability on recording and reproducing data can be improved.

公开(公告)号：EP1467363A4

公开(公告)日：2007-12-12

申请号：EP03701058

申请日：2003-01-10

申请人： FUJITSU LTD

发明人： AOYAMA NOBUHIDE ,  AKIYAMA RYOTA ,  MORIMOTO YASUAKI ,  HOSOKAWA TETSUO

IPC分类号： G11B7/00 ,  G11B7/005 ,  G11B7/007 ,  G11B7/013 ,  G11B11/105 ,  G11B20/10 ,  G11B20/12 ,  G11B20/14

CPC分类号： G11B20/1403 ,  G11B7/005 ,  G11B7/0079 ,  G11B7/126 ,  G11B7/1263 ,  G11B7/24085 ,  G11B11/1051 ,  G11B11/10515 ,  G11B11/10543 ,  G11B11/10554 ,  G11B11/10584 ,  G11B11/10597 ,  G11B20/10 ,  G11B2007/0013 ,  G11B2020/1259

摘要： A storage apparatus, capable of record or reproduce of an optical information recording medium in which ROM information is recorded with phase pits and RAM information is recorded on top of a recording region of the phase pits, has a main controller that, when the output of the recording information detection system - a system for detecting reflected light of a laser beam from the optical information recording medium and generating signals corresponding to ROM and RAM information - simultaneously contains ROM and RAM signals corresponding to ROM and RAM information, performs negative feedback control of a semiconductor laser emission using ROM signal in the output of the recording information detection system and performs control so as to obtain read-out and played-back ROM signal from the output of an optical intensity detection system for detecting the intensity of the laser light.

公开(公告)号：EP1365393A1

公开(公告)日：2003-11-26

申请号：EP02716421.9

申请日：2002-01-28

申请人： Sanyo Electric Co., Ltd.

发明人： YANO, Hideaki ,  ASANO, Kenji ,  KISHIDA, Takanori

IPC分类号： G11B7/125 ,  G11B7/0045

CPC分类号： G11B7/126 ,  G11B7/0045 ,  G11B7/1267 ,  G11B11/1051 ,  G11B11/10515 ,  G11B11/10595

摘要： The present invention provides a disk recording-playback device comprising a laser drive circuit 15 for feeding a drive signal to an optical head 4 and adjusting the power of a laser beam irradiated by the optical head 4, an error correcting circuit 11 for detecting an error rate of a reproduced signal, and a system controller 10 for controlling operation of the laser drive circuit for signal reproduction and signal recording based on the output of the error correcting circuit 11. The system controller 10 successively sets the laser powers to at least three different values, obtains evaluation data for each laser power, approximates the relationships between the laser powers and the evaluation data to a quadratic curve, whereby an optimum laser power is derived corresponding to a vertex of the quadratic curve. Accordingly the optimum reproduction power and recording power are set, to thereby record and reproduce signals with high accuracy.

摘要翻译： 本发明提供一种盘记录再现装置，其包括：激光驱动电路15，用于向光头4提供驱动信号并调节由光头4照射的激光束的功率;误差校正电路11，用于检测误差 再现信号的速率;以及系统控制器10，用于根据纠错电路11的输出控制用于信号再现和信号记录的激光驱动电路的操作。系统控制器10依次将激光功率设置为至少三种不同的 获得每个激光功率的评估数据，将激光功率与评估数据之间的关系近似为二次曲线，从而导出对应于二次曲线的顶点的最佳激光功率。 相应地，设置最佳再现功率和记录功率，从而以高精度记录和再现信号。

公开(公告)号：EP0844609A1

公开(公告)日：1998-05-27

申请号：EP95927998.5

申请日：1995-08-09

申请人： Hitachi, Ltd.

发明人： SUKEDA, Hirofumi ,  SAGA, Hideki

IPC分类号： G11B11/10 ,  G11B7/00

CPC分类号： G11B7/1267 ,  G11B7/00456 ,  G11B11/1051 ,  G11B11/10517 ,  G11B11/10521 ,  G11B11/1053 ,  G11B11/10563

摘要： A high-speed large capacity file system is built in which the track density is improved by applying a highly precise magnetic domain width control technique to a light pulse-irradiated magnetic field modulation magnetooptical disk device which can be overwritten and is suitable for the improvement of the bit density. For the purpose, bipolar magnetic domains having edges of positive and negative polarities with respect to the direction of movement of a light spot are formed and the recording condition is optimized. Normal recording is carried out on the basis of the result of the optimization of the recording condition.

摘要翻译： 构建高速大容量文件系统，其中通过将高精度的磁畴宽度控制技术应用于可被重写并且适用于改进的光脉冲照射的磁场调制磁光盘装置来提高磁道密度 比特密度。 为此目的，形成相对于光点移动方向具有正极性和负极性边缘的双极磁畴，并且记录条件被优化。 基于记录条件的优化结果进行正常记录。

公开(公告)号：EP1604357B1

公开(公告)日：2007-11-14

申请号：EP04716675.6

申请日：2004-03-03

申请人： Koninklijke Philips Electronics N.V.

发明人： VAN KESTEREN, Hans, W.

IPC分类号： G11B7/0045 ,  G11B11/105

CPC分类号： G11B11/1053 ,  G11B7/0045 ,  G11B11/10504 ,  G11B11/1051 ,  G11B11/10595

摘要： The present invention relates to a method and apparatus for writing data to a storage layer of a magneto-optical recording medium using a laser beam of a predetermined power level (Pw) and a magnetic field modulated to at least two predetermined field levels (+Hw; -Hw) in accordance with said writing data. The predetermined power level and/or the at least two predetermined field levels are adjusted in dependence on a pattern of previously recorded data so as to compensate for stray field variations caused by run lengths of the previously recorded data pattern. Read-out jitter and errors can be reduced thereby.

公开(公告)号：EP0525776B1

公开(公告)日：2003-11-05

申请号：EP92113021.7

申请日：1992-07-30

申请人： SHARP KABUSHIKI KAISHA

发明人： Murakami, Yoshiteru ,  Ohta, Kenji ,  Takahashi, Akira

IPC分类号： G11B11/10

CPC分类号： G11B11/10521 ,  G11B11/10508 ,  G11B11/1051 ,  G11B11/10528 ,  G11B11/1053 ,  G11B11/10595

公开(公告)号：EP1052635A1

公开(公告)日：2000-11-15

申请号：EP00109904.3

申请日：2000-05-10

申请人： SANYO ELECTRIC Co., Ltd.

发明人： Tanaka, Sayoko, c/o Sanyo Electric Co., Ltd. ,  Suzuki, Yoshihisa, c/o Sanyo Electric Co., Ltd.

IPC分类号： G11B11/105

CPC分类号： G11B11/10595 ,  G11B11/1051 ,  G11B11/1053

摘要： A magnetic domain of a predetermined length is formed on a magneto-optical recording medium (1) with the phase difference (δ) altered between the rise of a laser drive signal (LD) to generate a pulsed laser beam and the fall of a magnetic head drive signal (MD) to generate a magnetic field. A phase difference optimization circuit (13) detects an optimum phase difference (δop) corresponding to the lowest error rate from the error rate of a reproduced signal obtained by reproducing the formed magnetic domain. A magnetic head drive signal (MD) is newly generated to produce a magnetic field modulated according to a record signal based on the detected optimum phase difference (δop). According to the generated magnetic head drive signal (MD) and the first laser drive signal (LD), a magnetic field is applied to the magneto-optical recording medium (1), and a pulsed laser is directed onto the magneto-optical recording medium (1) to record a signal.

摘要翻译： 在磁光记录介质（1）上形成预定长度的磁畴，其中相位差（delta）在激光驱动信号（LD）的上升之间改变以产生脉冲激光束并且磁化 磁头驱动信号（MD）产生磁场。 相位差优化电路（13）从通过再现所形成的磁畴获得的再现信号的误码率来检测与最低误差率相对应的最佳相位差（Δop）。 新产生磁头驱动信号（MD），以根据检测到的最佳相位差（Δop）产生根据记录信号调制的磁场。 根据所生成的磁头驱动信号（MD）和第一激光驱动信号（LD），向磁光记录介质（1）施加磁场，将脉冲激光导向磁光记录介质 （1）记录信号。

公开(公告)号：EP0915462A1

公开(公告)日：1999-05-12

申请号：EP97930772.5

申请日：1997-07-11

申请人： HITACHI MAXELL, LTD. ,  SANYO ELECTRIC Co., Ltd.

发明人： AWANO, Hiroyuki ,  SHIRAI, Hiroshi ,  YOSHIHIRO, Masafumi ,  OONUKI, Satoru ,  OHTA, Norio ,  SHIMAZAKI, Katsusuke ,  NAGAI, Nobuyuki ,  SUMI, Satoshi ,  YAMAGUCHI, Atsushi

IPC分类号： G11B11/10

CPC分类号： G11B11/10584 ,  G11B11/1051 ,  G11B11/10515 ,  G11B11/10554 ,  G11B11/10586 ,  G11B11/10595 ,  G11B27/19 ,  G11B27/3027

摘要： A magneto-optical recording medium 11 is irradiated with a reproducing light beam 13 so that only a minute magnetic domain 313b, which is subjected to recording in a recording layer 18 and which is smaller than 1/2 of a spot radius of the recording light beam 13, is selected by a gate layer 17 and transferred to a magnetic domain-magnifying and reproducing layer 3. The magnetic domain transferred to the magnetic domain-magnifying and reproducing layer 3 is magnified by using a magnifying and reproducing magnetic field 411 of an alternating magnetic field. A large reproduction signal is obtained from the magnified magnetic domain 419, and the minute magnetic domain can be subjected to reproduction at a high resolving power and at a high S/N ratio. The magnified magnetic domain 419 is reduced by using a reducing reproducing magnetic field 415 of the alternating magnetic field. The gate layer 17 has a thickness which is not less than a thickness of a magnetic wall of the magnetic domain. A non-magnetic layer may be used in place of the gate layer 17.

公开(公告)号：EP0762410A1

公开(公告)日：1997-03-12

申请号：EP95918157.9

申请日：1995-05-10

申请人： HITACHI MAXELL, LTD.

发明人： SHIMAZAKI, Katsusuke ,  YOSHIHIRO, Masafumi ,  SAKEMOTO, Akito ,  OHTA, Norio ,  ISHIZAKI, Osamu ,  OHNUKI, Satoru ,  SUGIYAMA, Toshinori ,  ISHITSUKA, Kazuko

IPC分类号： G11B11/10

CPC分类号： G11B11/10515 ,  G11B11/10502 ,  G11B11/10508 ,  G11B11/1051 ,  G11B11/10521 ,  G11B11/10528 ,  G11B11/1053 ,  G11B11/10534 ,  G11B11/10554 ,  G11B11/10586 ,  G11B11/10595

摘要： On a surface of a transparent substrate 1 having a preformat pattern 2 formed thereon are laminated a first recording layer 4 in which a recording state exists in one different magnetic field region of an applied external magnetic field and a second recording layer 6 in which two recording states exist in magnetic field regions different from that for the first recording layer. As required, dielectric layers 3, 5 and 7, a reflecting layer 8 and a protection layer 9 can be laminated. The 4-valued recording of information becomes possible by assigning information signals "1", "0", "3" and "2" to H 0 , H 1 , H 2 and H 3 , respectively.