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1. 发明专利

JP2010186548A Information reproducing device and reproduction signal processing circuit 有权
标题翻译：信息再现设备和生成信号处理电路
公开(公告)号：JP2010186548A
公开(公告)日：2010-08-26
申请号：JP2010086664
申请日：2010-04-05
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： KIKUKAWA ATSUSHI , MINEMURA HIROYUKI
IPC分类号： G11B20/14 , G11B7/005 , G11B20/10 , G11B20/18
摘要： PROBLEM TO BE SOLVED: To stably operate a PLL (Phase-locked loop) even in if an S/N ratio is low in a Blu-ray Disc (R) reproduction system.
SOLUTION: The loop composition of a PLL is changed in accordance with an operational state, and an FIR equalizer output is used for detecting a phase. An optical disk reproduction signal processing system is provided that achieves a low error rate even in a state in which the S/N ratio of an input signal is low, avoids an edge low in phase-detection precision and a signal string which is erroneously detected as an edge with high possibility by a conventional method, and is ready for various modes of input signals.
COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：即使在蓝光盘（R）再现系统中S / N比低的情况下，也可稳定地操作PLL（锁相环）。解决方案：根据操作状态改变PLL的环路组成，并且使用FIR均衡器输出来检测相位。提供一种光盘再生信号处理系统，即使在输入信号的S / N比低的状态下也能够实现低误码率，避免了相位检测精度的边缘偏差和错误检测的信号串作为通过常规方法具有高可能性的边缘，并且可以用于各种模式的输入信号。版权所有（C）2010，JPO＆INPIT

2. 发明专利

JP2010086639A Optical disk device 有权
标题翻译：光盘设备
公开(公告)号：JP2010086639A
公开(公告)日：2010-04-15
申请号：JP2008257808
申请日：2008-10-02
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： KIKUKAWA ATSUSHI
IPC分类号： G11B7/005 , G11B7/125
CPC分类号： G11B20/10009 , G11B7/126 , G11B20/10046 , G11B20/10222 , G11B20/10296 , G11B20/1403 , G11B2220/2541
摘要： PROBLEM TO BE SOLVED: To exclude, to the utmost, analog elements which are significantly different in characteristics from each other, from an optical disk drive. SOLUTION: An optical disk device has: a means 38, 39 which convert the sampling frequency of a pulse-reproducing signal to a different frequency; a means 40, 41 for converting a modulation clock frequency at the same rate as the sampling frequency; and a means for automatically setting a sampling frequency-converting means and a modulation clock-converting means on the basis of a channel clock. COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：从光盘驱动器最大限度地排除彼此显着不同的特征的模拟元件。解决方案：光盘装置具有：将脉冲再现信号的采样频率转换成不同频率的装置38,39; 用于以与采样频率相同的速率转换调制时钟频率的装置40,41; 以及用于基于通道时钟自动设置采样频率转换装置和调制时钟转换装置的装置。版权所有（C）2010，JPO＆INPIT

3. 发明专利

JP2005216364A Signal evaluation method and device therefor 有权
标题翻译：信号评估方法及其设备
公开(公告)号：JP2005216364A
公开(公告)日：2005-08-11
申请号：JP2004020689
申请日：2004-01-29
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： MAEDA TAKESHI , MINEMURA HIROYUKI , KIKUKAWA ATSUSHI
IPC分类号： G11B7/24 , G11B20/10 , G11B20/14 , G11B20/18
摘要： PROBLEM TO BE SOLVED: To solve the problem that the quality of a signal is possibly decreased in a PRML compliant device unless a recording method is optimum to the PRML (Partial Response Maximum Likelihood). SOLUTION: A signal processing circuit which reproduces information is provided with at lest a nonlinear processing circuit and a linear processing circuit. Consequently, recording and reproduction can be carried out while maintaining compatibility even in an optical disk which reproduces information with a different reproducing method. COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：为了解决在PRML兼容装置中可能降低信号质量的问题，除非记录方法对PRML（部分响应最大似然）是最佳的。解决方案：以非线性处理电路和线性处理电路提供再现信息的信号处理电路。因此，即使在以不同的再现方法再现信息的光盘中，也可以保持兼容性而进行记录和再现。版权所有（C）2005，JPO＆NCIPI

4. 发明专利

JP2006252681A Optical disk drive and pll circuit 审中-公开
标题翻译：光盘驱动器和PLL电路
公开(公告)号：JP2006252681A
公开(公告)日：2006-09-21
申请号：JP2005068341
申请日：2005-03-11
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： MINEMURA HIROYUKI , KIKUKAWA ATSUSHI
IPC分类号： G11B20/10 , G11B20/14 , G11B20/18 , H03H21/00 , H03L7/08 , H03L7/087
CPC分类号： G11B20/10009 , G11B20/10055 , G11B20/10111 , G11B20/10296 , G11B20/1403 , G11B2020/1288 , G11B2220/2541
摘要： PROBLEM TO BE SOLVED: To provide an optical disk drive capable of obtaining excellent reproduction performance by stabilizing a PLL circuit. SOLUTION: The operation of the PLL circuit is stabilized by arranging phase detectors for signals before and behind an FIR filter, respectively, and by alternatively using them in accordance with the operating status of the PLL. Thus, the optical disk drive which is improved in reproduction performance so as to pull out an operation limit of a viterbi decoder can be obtained. COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：解决的问题：提供能够通过稳定PLL电路而获得优异的再现性能的光盘驱动器。解决方案：通过分别对FIR滤波器之前和之后的信号布置相位检测器，并根据PLL的工作状态交替使用PLL电路，使PLL电路的工作得到稳定。因此，可以获得提高再现性能以便提取维特比解码器的操作限制的光盘驱动器。版权所有（C）2006，JPO＆NCIPI

5. 发明专利

JP2009187593A High-speed optical disk drive 审中-公开
标题翻译：高速光盘驱动器
公开(公告)号：JP2009187593A
公开(公告)日：2009-08-20
申请号：JP2008022924
申请日：2008-02-01
申请人： Hitachi Ltd , Hitachi-Lg Data Storage Inc , 株式会社日立エルジーデータストレージ , 株式会社日立製作所
发明人： KIKUKAWA ATSUSHI
IPC分类号： G11B7/125 , G11B7/005 , G11B20/10
CPC分类号： G11B20/10046 , G11B7/126 , G11B20/10009 , G11B20/10037 , G11B20/10111 , G11B20/10296 , G11B20/10425 , G11B20/10481 , G11B2220/2541
摘要： PROBLEM TO BE SOLVED: To solve the problems, i.e., if the read speed is increased while the high-frequency modulated carrier is fixed at a constant frequency, it becomes difficult to separate the read signal from the carrier by using bandwidth limitation of the analog system because the upper limit of the read signal band nears to the carrier frequency; moreover, if the separation between them is eased by raising the carrier frequency, a problem that write-waveform controls become difficult arises. SOLUTION: The carrier amplitude is suppressed simultaneously with prevention of leakage to the read signal band by converting the carrier frequency into the stop-band of the adaptive equalizer by using aliasing that occurs at AD conversion. COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：为了解决这个问题，即如果在高频调制载波固定在恒定频率的情况下增加读取速度，则难以通过使用带宽限制来将载波的读取信号分离因为读取信号频带的上限接近载波频率; 此外，如果通过提高载波频率来缓解它们之间的间隔，则会产生写波形控制变得困难的问题。解决方案：通过使用在AD转换下发生的混叠，将载波频率转换成自适应均衡器的阻带，同时防止载波幅度被阻止到读取信号频带的泄漏。版权所有（C）2009，JPO＆INPIT

6. 发明专利

JP2009104686A Optical disk medium, information recording method, and optical disk drive 审中-公开
标题翻译：光盘介质，信息记录方法和光盘驱动器
公开(公告)号：JP2009104686A
公开(公告)日：2009-05-14
申请号：JP2007273582
申请日：2007-10-22
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： KIKUKAWA ATSUSHI
IPC分类号： G11B7/007 , G11B7/0045 , G11B7/005 , G11B7/125 , G11B7/14
CPC分类号： G11B7/00745 , G11B7/00736 , G11B20/1217 , G11B2020/1232 , G11B2020/1238 , G11B2020/1297 , G11B2220/2537
摘要： PROBLEM TO BE SOLVED: To provide an optical disk drive and a disk format necessary for an optical disk, which reduce a problem of reduction in an effective transfer rate attributable to track jumps caused at a certain interval when performing recording and reproduction in parallel by using a plurality of beams, and thereby achieving a high transfer rate. SOLUTION: A block constituting a recording unit is divided into sub-blocks 3, and the sub-blocks are arranged in a radial direction of the disk. The optical disk drive includes a means for irradiating the disk with a plurality of spots, a means for pulse modulating the spots by using the same frequency and different phases, and a means for receiving light from the spots reflected by the disk by using a single photodetector, and separating the reflected light into mutually independent lines of signals in terms of a time domain. COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：提供光盘所需的光盘驱动器和盘格式，这减少了当在执行记录和再现时以一定间隔引起的归因于轨迹跳跃的有效传送速率的降低的问题通过使用多个光束并联，从而实现高传输速率。解决方案：构成记录单元的块被划分为子块3，并且子块沿盘的径向布置。光盘驱动器包括用于向多个点照射盘的装置，用于通过使用相同的频率和不同相位对斑点进行脉冲调制的装置，以及用于通过使用单个光盘从光盘反射的光点接收光的装置并且将反射光分离成相互独立的时域信号线。版权所有（C）2009，JPO＆INPIT

7. 发明专利

JP2009087412A Optical information reproducing method and apparatus, and optical information recording medium 有权
标题翻译：光学信息再现方法和设备，以及光信息记录介质
公开(公告)号：JP2009087412A
公开(公告)日：2009-04-23
申请号：JP2007253034
申请日：2007-09-28
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： USHIYAMA JUNKO , KUROKAWA TAKAHIRO , KIKUKAWA ATSUSHI , MINEMURA HIROYUKI , MIYAMOTO JIICHI
IPC分类号： G11B7/005 , G11B7/007
CPC分类号： G11B7/005 , G11B7/00736 , G11B20/10009 , G11B20/10027 , G11B20/10046 , G11B20/10055 , G11B20/10296 , G11B20/10425 , G11B20/22 , G11B2007/0013 , G11B2220/235 , G11B2220/2537
摘要： PROBLEM TO BE SOLVED: To solve the problem of deterioration of readout signal quality caused by distortion of the readout signal occurring due to interlayer crosstalk during reproduction from an optical recording medium including a plurality of information layers.
SOLUTION: At a predetermined radius, a correction coefficient for correcting the amount of fluctuation components is calculated from a readout signal with distortion due to the interlayer crosstalk, and then stored. the stored correction coefficient is used to eliminate interlayer crosstalk components and to correct readout signal fluctuation during reproduction on a predetermined area. In this way, the original readout signal without interlayer crosstalk components is obtained, and thus good-quality reproduction characteristics are achieved.
COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：解决的问题：解决由包含多个信息层的光记录介质再现期间由于层间串扰而产生的读出信号的失真引起的读出信号质量恶化的问题。解决方案：在预定的半径处，由具有由于层间串扰导致的失真的读出信号计算用于校正波动分量的校正系数，然后存储。所存储的校正系数用于消除层间串扰分量，并且在预定区域的再现期间校正读出信号波动。以这种方式获得没有层间串扰分量的原始读出信号，从而实现良好的再现特性。版权所有（C）2009，JPO＆INPIT

8. 发明专利

JP2008282506A Circuit and method for processing reproduction signal, and optical disk drive 审中-公开
标题翻译：用于处理生成信号的电路和方法以及光盘驱动器
公开(公告)号：JP2008282506A
公开(公告)日：2008-11-20
申请号：JP2007127673
申请日：2007-05-14
申请人： Hitachi Ltd , Hitachi-Lg Data Storage Inc , 株式会社日立エルジーデータストレージ , 株式会社日立製作所
发明人： KIKUKAWA ATSUSHI , KUROKAWA TAKAHIRO
IPC分类号： G11B20/10
CPC分类号： H03M1/1023 , G11B20/10009 , G11B20/10203 , G11B20/10296 , G11B20/10425 , G11B2220/2541 , H03M1/12
摘要： PROBLEM TO BE SOLVED: To provide a read channel and a drive, capable of suppressing deteriorated performance of a PLL and a Viterbi decoder, using a direct current component removal means capable of operating at speed higher than the conventioned speeds.
SOLUTION: By the identification of an edge position using differential of a regeneration signal, a direct current component is detected from the level of the middle point of the edge. Also, at identifying of the edge position from a differential coefficient of the reproduced signal, by restricting the absolute values of the maximum value and the minimum value of the differential coefficient, a false edge detection caused by a long mark or space signal is prevented. Also, an internal operation is controlled by a PLL state and the magnitude of the direct current component.
COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：提供能够抑制PLL和维特比解码器的性能劣化的读通道和驱动器，其使用能够以高于常规速度的速度运行的直流分量去除装置。解决方案：通过使用再生信号的差分识别边缘位置，从边缘的中点的水平检测直流分量。此外，在通过限制再现信号的微分系数的边缘位置，通过限制微分系数的最大值和最小值的绝对值，防止由长标记或空格信号引起的假边缘检测。此外，内部操作由PLL状态和直流分量的大小控制。版权所有（C）2009，JPO＆INPIT

9. 发明专利

JP2008140525A Optical disk drive having envelope defect detection function 有权
标题翻译：具有包络缺陷检测功能的光盘驱动器
公开(公告)号：JP2008140525A
公开(公告)日：2008-06-19
申请号：JP2006328351
申请日：2006-12-05
申请人： Hitachi Ltd , Hitachi-Lg Data Storage Inc , 株式会社日立エルジーデータストレージ , 株式会社日立製作所
发明人： KIKUKAWA ATSUSHI , KUROKAWA TAKAHIRO
IPC分类号： G11B7/004 , G11B7/005
CPC分类号： G11B20/18 , G11B2020/183
摘要： PROBLEM TO BE SOLVED: To detect an envelope defect of a read signal caused by a fingerprint on the surface of a disk, the inter-layer interference of a dual-layer disk or the like which is a factor of a read error of an optical disk, and to improve the read capability of an optical disk drive while avoiding a read error by performing appropriate processing.
SOLUTION: A means 6 for detecting an envelope defect and a means 7 for counting the number of occurrences of the envelope defect are included. A read condition based on the factor of a read error is set at the time of read retry, and a read condition suitable for the decoding of a readout signal containing an envelope defect is set at the time of the detection of the envelope defect.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：为了检测由盘表面上的指纹引起的读信号的包络缺陷，作为读错误的因素的双层盘等的层间干扰并且通过执行适当的处理来提高光盘驱动器的读取能力，同时避免读取错误。包括用于检测包络缺陷的装置6和用于对包络缺陷的发生次数进行计数的装置7。在读取重试时，设置基于读取误差因子的读取条件，并且在检测到包络缺陷时设置适合于包含包络缺陷的读出信号的解码的读取条件。版权所有（C）2008，JPO＆INPIT

10. 发明专利

JP2004348777A Vertical magnetic recording medium and magnetic recording device 审中-公开
标题翻译：垂直磁记录介质和磁记录装置
公开(公告)号：JP2004348777A
公开(公告)日：2004-12-09
申请号：JP2003141296
申请日：2003-05-20
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： TANAHASHI KIWAMU , ARAI REIKO , KIKUKAWA ATSUSHI
IPC分类号： G11B5/667 , G11B5/127 , G11B5/66 , G11B5/73 , G11B5/738 , G11B5/84
CPC分类号： G11B5/667 , G11B5/1278 , G11B5/66 , G11B5/84
摘要： PROBLEM TO BE SOLVED: To provide a vertical magnetic recording medium wherein quality of a reproducing signal is heightened by controlling magnetic domains of a soft magnetic base layer and demagnetization of recording magnetization due to a floating magnetic field is suppressed and which has a high medium S/N ratio at ≥7.75 gigabit/cm
2 recording density, and also to provide a high density magnetic recording device having high reliability.
SOLUTION: The soft magnetic base layer is constituted of a first amorphous soft magnetic layer to which an exchange bias magnetic field is imparted by an anti-ferromagnetic layer directly or via a ferromagnetic layer and a second amorphous soft magnetic layer formed thereon via a non-magnetic layer and the first and the second amorphous soft magnetic layers are anti-ferromagnetically bonded to each other.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：解决的问题：为了提供通过控制软磁性基层的磁畴来提高再现信号的质量并且由于浮动磁场而导致的记录磁化的退磁的垂直磁记录介质被抑制，并且其具有高介质S / N比在≥7.75吉比特/厘米2 /秒记录密度，并且还提供了具有高可靠性的高密度磁记录装置。解决方案：软磁性基层由第一非晶软磁层构成，交换偏置磁场由反铁磁层直接或通过铁磁层和形成在其上的第二非晶软磁层经由非磁性层和第一和第二非晶软磁性层彼此反铁磁结合。版权所有（C）2005，JPO＆NCIPI

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