公开(公告)号：US07764578B2

公开(公告)日：2010-07-27

申请号：US11674230

申请日：2007-02-13

申请人： Takahiro Kurokawa ,  Harukazu Miyamoto

发明人： Takahiro Kurokawa ,  Harukazu Miyamoto

IPC分类号： G11B7/00

CPC分类号： G11B7/0906

摘要： An object of the present invention is to improve a conventional DPD method having a problem that a tracking servo becomes unstable due to a reduction in the accuracy of detecting a phase difference between short mark signals at an edge, in a case where the amplitudes of the short mark signals are very small, or where a readout signal contains large noise. To this end, the present invention provides a method for increasing the contribution ratio of long mark signals to generate a tracking error signal by causing a phase difference pulse to include information on a phase difference, and by causing the area of the pulse to be weighted according to the length of a mark/space adjacent to a concerned edge.

摘要翻译： 本发明的一个目的是改进传统的DPD方法，其中由于在检测边缘上的短标记信号之间的相位差的精度降低时跟踪伺服变得不稳定的问题， 短标记信号非常小，或者读出信号包含大的噪声。 为此，本发明提供了一种通过使相位差脉冲包括关于相位差的信息并且通过使得脉冲的面积被加权来增加长标记信号的贡献率以产生跟踪误差信号的方法 根据与相关边缘相邻的标记/空间的长度。

公开(公告)号：US07751288B2

公开(公告)日：2010-07-06

申请号：US11704352

申请日：2007-02-09

申请人： Soichiro Eto ,  Koichi Watanabe ,  Takahiro Kurokawa

发明人： Soichiro Eto ,  Koichi Watanabe ,  Takahiro Kurokawa

IPC分类号： G11B15/52

CPC分类号： G11B7/0062 ,  G11B7/1267

摘要： A write power adjustment method and optical read/write apparatus for accurate optimum write power setup. Different levels of write power Pwm are used to perform a test write and calculate a modulation Mm corresponding to each level of write power Pwm. Different write power compensated values Pcn are used to calculate an evaluated value Smn=Mm×(Pwm−Pcn). Pcn that maximizes the linearity of the relationship between compensated write power (Pwm−Pcn) and evaluated value Smn is determined as an optimum write power compensated value PcO. Compensated write power PthO that provides a modulation of zero, that is, an evaluated value SmO of zero, when the relationship between compensated write power (Pwm−PcO) for PcO and evaluated value SmO is subjected to linear approximation is determined. PthO and optimum write power compensated value PcO are used to calculate a write power threshold Pth=PthO+PcO. A predetermined calculation is performed on Pth to determine optimum write power Popt. In contrast to a conventional write power adjustment method (κ method), the present invention makes it possible to accurately adjust for the optimum write power even when the optical disc's write power Pwm-to-evaluated value M×Pw relationship is not linear or its modulation M varies.

摘要翻译： 一种写入功率调整方法和光学读/写装置，用于精确的最佳写入功率设置。 使用不同级别的写入功率Pwm进行测试写入，并计算与写入功率Pwm对应的调制Mm。 使用不同的写功率补偿值Pcn来计算评估值Smn = Mm×（Pwm-Pcn）。 将补偿写入功率（Pwm-Pcn）与评估值Smn之间的关系的线性度最大化的Pcn被确定为最佳写入功率补偿值PcO。 确定当PcO的补偿写入功率（Pwm-PcO）与评估值SmO之间的关系经受线性近似时，提供零调制的补偿写入功率PthO，即评估值SmO为零。 PthO和最佳写功率补偿值PcO用于计算写功率阈值Pth = PthO + PcO。 在Pth上执行预定的计算以确定最佳写入功率Popt。 与传统的写入功率调整方法（＆kgr;方法）相反，即使当光盘的写入功率Pwm至评估值M×Pw关系不是线性时，本发明也可以精确地调整最佳写入功率， 其调制M变化。

公开(公告)号：US20100046354A1

公开(公告)日：2010-02-25

申请号：US12588836

申请日：2009-10-29

申请人： Harukazu Miyamoto ,  Takahiro Kurokawa

发明人： Harukazu Miyamoto ,  Takahiro Kurokawa

IPC分类号： G11B7/24

CPC分类号： G11B20/0021 ,  G11B7/005 ,  G11B7/007 ,  G11B7/24082 ,  G11B20/00086 ,  G11B20/1403 ,  G11B27/19 ,  G11B27/24 ,  G11B2220/20

摘要： The invention provides an optical disk that enables high-speed reproduction of address signals. A wobble address system for optical disk supports various types of synchronization, such as phase synchronization, bit synchronization, word synchronization, etc., to be established easily with high detection reliability with the use of an self-orthogonal code. Thus, the invention provides a method for easily synchronizing an address signal, i.e., high-speed reproduction of the address signal. Further, by virtue of an efficient modulation system of the address signal and redundancy thereof, it becomes possible to detect address information with high reliability. This capability is particularly effective in optical recording/reproduction with a blue light source whose signal light quantity and reproduction quality are prone to reduce. Moreover, other additional data of the address data is preserved in the wobbles, which provides medium information to a rewritable optical disk without using embossed pits such that a high-reliability disk (with enhanced security) is realized with a low cost and easily.

摘要翻译： 本发明提供一种能够高速再现地址信号的光盘。 用于光盘的摆动地址系统支持使用自正交码容易地建立具有高检测可靠性的各种类型的同步，诸如相位同步，位同步，字同步等。 因此，本发明提供了一种用于容易地同步地址信号的方法，即地址信号的高速再现。 此外，通过地址信号的有效调制方式及其冗余性，可以高可靠性地检测地址信息。 该功能在具有信号光量和再现质量易于降低的蓝色光源的光学记录/再现中特别有效。 此外，地址数据的其他附加数据被保留在摆动中，其向不可使用浮雕凹坑的可重写光盘提供媒体信息，从而以低成本且容易地实现高可靠性盘（具有增强的安全性）。

公开(公告)号：US07570548B2

公开(公告)日：2009-08-04

申请号：US11327500

申请日：2006-01-09

申请人： Takahiro Kurokawa ,  Hiromi Kudo ,  Harukazu Miyamoto

发明人： Takahiro Kurokawa ,  Hiromi Kudo ,  Harukazu Miyamoto

IPC分类号： G11B7/00

CPC分类号： G11B7/0945 ,  G11B7/13925

摘要： This optical pickup has a nonvolatile memory from which data can be electronically read out, and stores as data the difference between the spherical aberration when the readout signal jitter reaches a minimum, and the spherical aberration when the tracking error signal amplitude reaches a maximum. The positioning of an optical detector or detection lens is adjusted so that the focus error signal is almost zero when the readout signal jitter reaches a minimum. The invention provides a method for performing high-precision adjustment of the focus offset and spherical aberration, even in the case of a disk which does not have data recorded on it.

摘要翻译： 该光学拾取器具有非易失性存储器，数据可以从其中被电子读出，并且当读出信号抖动达到最小时，将数据作为数据存储在球面像差之间，并且当跟踪误差信号幅度达到最大值时存储球面像差。 调整光学检测器或检测透镜的定位，使得当读出信号抖动达到最小时，聚焦误差信号几乎为零。 本发明提供了即使在没有记录数据的盘的情况下，也可以进行高精度调整焦点偏移和球面像差的方法。

公开(公告)号：US07489610B2

公开(公告)日：2009-02-10

申请号：US12183929

申请日：2008-07-31

申请人： Shinji Fujita ,  Takeshi Maeda ,  Manabu Shiozawa ,  Takahiro Kurokawa

发明人： Shinji Fujita ,  Takeshi Maeda ,  Manabu Shiozawa ,  Takahiro Kurokawa

IPC分类号： G11B5/09

CPC分类号： G11B7/00456 ,  G11B7/0062

摘要： An optical disk recording method includes the steps of: providing a multi-pulse chain from a recording wave; independently changing the pulse rise timing and pulse fall timing (pulse width) of the first pulse in the multi-pulse chain in accordance with a preceding space length and a recording mark length; changing the pulse rise timing and pulse fall timing (pulse width) in accordance with a following space length and the recording mark length in a predetermined timing or in independence; and in relation to the smallest mark recorded by irradiation with mono pulse, changing the rise timing in accordance with the preceding space length and the recording mark length and the fall timing (pulse width) in accordance with the following space length and recording mark length, compensating various optical disks different in recording material without change of the fundamental waveform.

公开(公告)号：US07471605B2

公开(公告)日：2008-12-30

申请号：US10919489

申请日：2004-08-17

申请人： Shinji Fujita ,  Takeshi Maeda ,  Manabu Shiozawa ,  Takahiro Kurokawa

发明人： Shinji Fujita ,  Takeshi Maeda ,  Manabu Shiozawa ,  Takahiro Kurokawa

IPC分类号： G11B5/09

CPC分类号： G11B7/00456 ,  G11B7/0062

摘要： An optical disk recording method includes the steps of: providing a multi-pulse chain from a recording wave; independently changing the pulse rise timing and pulse fall timing (pulse width) of the first pulse in the multi-pulse chain in accordance with a preceding space length and a recording mark length; changing the pulse rise timing and pulse fall timing (pulse width) in accordance with a following space length and the recording mark length in a predetermined timing or in independence; and in relation to the smallest mark recorded by irradiation with mono pulse, changing the rise timing in accordance with the preceding space length and the recording mark length and the fall timing (pulse width) in accordance with the following space length and recording mark length, compensating various optical disks different in recording material without change of the fundamental waveform.

摘要翻译： 光盘记录方法包括以下步骤：从记录波提供多脉冲链; 根据先前的空间长度和记录标记长度独立地改变多脉冲链中的第一脉冲的脉冲上升时间和脉冲下降时间（脉冲宽度）; 根据以下空间长度和记录标记长度在预定时间或独立性中改变脉冲上升时间和脉冲下降时间（脉冲宽度）; 并且相对于通过单脉冲照射记录的最小标记，根据以前的空格长度和记录标记长度以及根据以下空格长度和记录标记长度的下降时间（脉冲宽度）来改变上升时间， 补偿记录材料不同的各种光盘，而不改变基波形。

公开(公告)号：US20080291812A1

公开(公告)日：2008-11-27

申请号：US12213763

申请日：2008-06-24

申请人： Harukazu Miyamoto ,  Takahiro Kurokawa

发明人： Harukazu Miyamoto ,  Takahiro Kurokawa

IPC分类号： G11B7/24

CPC分类号： G11B20/0021 ,  G11B7/005 ,  G11B7/007 ,  G11B7/24082 ,  G11B20/00086 ,  G11B20/1403 ,  G11B27/19 ,  G11B27/24 ,  G11B2220/20

摘要： The invention provides an optical disk that enables high-speed reproduction of address signals. A wobble address system for optical disk supports various types of synchronization, such as phase synchronization, bit synchronization, word synchronization, etc., to be established easily with high detection reliability with the use of an self-orthogonal code. Thus, the invention provides a method for easily synchronizing an address signal, i.e., high-speed reproduction of the address signal. Further, by virtue of an efficient modulation system of the address signal and redundancy thereof, it becomes possible to detect address information with high reliability. This capability is particularly effective in optical recording/reproduction with a blue light source whose signal light quantity and reproduction quality are prone to reduce. Moreover, other additional data of the address data is preserved in the wobbles, which provides medium information to a rewritable optical disk without using embossed pits such that a high-reliability disk (with enhanced security) is realized with a low cost and easily.

公开(公告)号：US07446685B1

公开(公告)日：2008-11-04

申请号：US11828381

申请日：2007-07-26

申请人： Atsushi Kikugawa ,  Takahiro Kurokawa

发明人： Atsushi Kikugawa ,  Takahiro Kurokawa

IPC分类号： H03M1/00

CPC分类号： H03M1/1023 ,  G11B20/10009 ,  G11B20/10203 ,  G11B20/10296 ,  G11B20/10425 ,  G11B2220/2541 ,  H03M1/12

摘要： The present invention provides a read channel and a drive capable of suppressing deterioration in performance of a PLL and a Viterbi decoder by using a DC component eliminating means capable of higher-speed operation than hitherto. The location of an edge is determined by using differential of a read signal, and a DC component is detected from the midpoint level of the edge. Detection of a pseudo-edge due to a long mark or space signal is prevented by limiting the absolute value of a maximum or minimum of a differential coefficient when the location of the edge is determined from the differential coefficient of the read signal. Internal operation of a DC component detector is controlled according to the state of the PLL and the magnitude of the DC component.

摘要翻译： 本发明提供一种读取通道和驱动器，其能够通过使用能够比迄今为止更高速度运行的DC分量消除装置来抑制PLL和维特比解码器的性能的劣化。 通过使用读取信号的差分确定边缘的位置，并且从边缘的中点电平检测DC分量。 当根据读取信号的微分系数确定边缘的位置时，通过限制微分系数的最大值或最小值的绝对值来防止由长标记或空格信号引起的伪边缘的检测。 根据PLL的状态和DC分量的大小控制直流分量检测器的内部动作。

公开(公告)号：US20070058501A1

公开(公告)日：2007-03-15

申请号：US11327500

申请日：2006-01-09

申请人： Takahiro Kurokawa ,  Hiromi Kudo ,  Harukazu Miyamoto

发明人： Takahiro Kurokawa ,  Hiromi Kudo ,  Harukazu Miyamoto

IPC分类号： G11B7/00

CPC分类号： G11B7/0945 ,  G11B7/13925

摘要： This optical pickup has a nonvolatile memory from which data can be electronically read out, and stores as data the difference between the spherical aberration when the readout signal jitter reaches a minimum, and the spherical aberration when the tracking error signal amplitude reaches a maximum. The positioning of an optical detector or detection lens is adjusted so that the focus error signal is almost zero when the readout signal jitter reaches a minimum. The invention provides a method for performing high-precision adjustment of the focus offset and spherical aberration, even in the case of a disk which does not have data recorded on it.

摘要翻译： 该光学拾取器具有非易失性存储器，数据可以从其中被电子读出，并且当读出信号抖动达到最小时，将数据作为数据存储在球面像差之间，并且当跟踪误差信号幅度达到最大值时存储球面像差。 调整光学检测器或检测透镜的定位，使得当读出信号抖动达到最小时，聚焦误差信号几乎为零。 本发明提供了即使在没有记录数据的盘的情况下，也可以进行高精度调整焦点偏移和球面像差的方法。

公开(公告)号：US07046616B2

公开(公告)日：2006-05-16

申请号：US10979171

申请日：2004-11-03

申请人： Harukazu Miyamoto ,  Takahiro Kurokawa

发明人： Harukazu Miyamoto ,  Takahiro Kurokawa

IPC分类号： G11B7/24

CPC分类号： G11B20/0021 ,  G11B7/005 ,  G11B7/007 ,  G11B7/24082 ,  G11B20/00086 ,  G11B20/1403 ,  G11B27/19 ,  G11B27/24 ,  G11B2220/20

摘要： The invention provides an optical disk that enables high-speed reproduction of address signals. A wobble address system for optical disk supports various types of synchronization, such as phase synchronization, bit synchronization, word synchronization, etc., to be established easily with high detection reliability with the use of an self-orthogonal code. Thus, the invention provides a method for easily synchronizing an address signal, i.e., high-speed reproduction of the address signal. Further, by virtue of an efficient modulation system of the address signal and redundancy thereof, it becomes possible to detect address information with high reliability. This capability is particularly effective in optical recording/reproduction with a blue light source whose signal light quantity and reproduction quality are prone to reduce. Moreover, other additional data of the address data is preserved in the wobbles, which provides medium information to a rewritable optical disk without using embossed pits such that a high-reliability disk (with enhanced security) is realized with a low cost and easily.