公开(公告)号：US20090109808A1

公开(公告)日：2009-04-30

申请号：US12208658

申请日：2008-09-11

申请人： Nobuaki Kaji ,  Kazuo Watabe ,  Takashi Usui ,  Keiichiro Yasu ,  Chosaku Noda ,  Kazuto Kuroda ,  Masahiro Saito

发明人： Nobuaki Kaji ,  Kazuo Watabe ,  Takashi Usui ,  Keiichiro Yasu ,  Chosaku Noda ,  Kazuto Kuroda ,  Masahiro Saito

IPC分类号： G11B7/00

CPC分类号： G11B7/126 ,  H01S5/0428

摘要： According to one embodiment, a laser drive circuit which supplies a drive current to a laser element which outputs light at a predetermined wavelength, and a laser control circuit which supplies a predetermined timing pulse for generation of relaxation oscillation in a laser drive current supplied to the laser drive circuit, the laser control circuit supplying a laser drive current higher than a threshold value which is supplied from the laser drive circuit to the laser element to enable laser light to be output from the laser element, the laser control circuit setting the laser drive current to a level lower than the threshold value on the basis of the timing pulse.

摘要翻译： 根据一个实施例，提供驱动电流到激光元件的激光驱动电路，激光元件输出预定波长的光;以及激光控制电路，其提供预定的定时脉冲，以产生提供给 激光驱动电路，激光控制电路提供高于从激光驱动电路提供给激光元件的阈值的激光驱动电流，以使激光能够从激光元件输出，激光控制电路设置激光驱动 基于定时脉冲将电流电流降至低于阈值的电平。

公开(公告)号：US20100135436A1

公开(公告)日：2010-06-03

申请号：US12626338

申请日：2009-11-25

申请人： Yuji NAGAI ,  Chosaku Noda ,  Kazuo Watabe ,  Akihito Ogawa ,  Kazuto Kuroda ,  Nobuhisa Yoshida ,  Nobumasa Naito ,  Naoki Morishita ,  Naomasa Nakamura ,  Hideaki Ohsawa ,  Hiroharu Sato ,  Hisashi Yamada ,  Toshihiko Kaneshige

发明人： Yuji NAGAI ,  Chosaku Noda ,  Kazuo Watabe ,  Akihito Ogawa ,  Kazuto Kuroda ,  Nobuhisa Yoshida ,  Nobumasa Naito ,  Naoki Morishita ,  Naomasa Nakamura ,  Hideaki Ohsawa ,  Hiroharu Sato ,  Hisashi Yamada ,  Toshihiko Kaneshige

IPC分类号： H04L27/04

CPC分类号： G11B20/14 ,  G11B20/0021 ,  G11B20/00579 ,  G11B20/00884 ,  G11B20/1426 ,  G11B2020/1457

摘要： According to one embodiment, a first encoder encodes main information, a second encoder encodes sub-information, a first modulator modulates a carrier based on an output of the first encoder, a duplicating module duplicates an output of the second encoder to generate encoded sub-information units, and a second modulator amplitude-modulates an output of the first modulator based on the encoded sub-information units. The second modulator amplitude-modulates with σ/(μ×(2N)1/2) being 0.4 or less, wherein a noise power of a transmission path or a storage medium is σ2, a number of the encoded sub-information units is N, signal levels after amplitude modulation, which correspond to bit 1 and bit 0 of the encoded sub-information units, are A and B, and a level difference A−B is μ.

摘要翻译： 根据一个实施例，第一编码器对主信息进行编码，第二编码器对子信息进行编码，第一调制器基于第一编码器的输出调制载波，复制模块复制第二编码器的输出， 信息单元和第二调制器基于编码的子信息单元对第一调制器的输出进行幅度调制。 第二调制器以＆sgr; /（μ×（2N）1/2）振幅调制为0.4或更小，其中传输路径或存储介质的噪声功率为2，编码子信息的数量 单位为N，对应于编码子信息单元的位1和位0的幅度调制后的信号电平为A和B，电平差A-B为μ。

公开(公告)号：US20090196138A1

公开(公告)日：2009-08-06

申请号：US12351226

申请日：2009-01-09

申请人： Nobuaki Kaji ,  Kazuo Watabe ,  Takashi Usui ,  Keiichiro Yusu ,  Chosaku Noda ,  Kazuto Kuroda ,  Masahiro Saito

发明人： Nobuaki Kaji ,  Kazuo Watabe ,  Takashi Usui ,  Keiichiro Yusu ,  Chosaku Noda ,  Kazuto Kuroda ,  Masahiro Saito

IPC分类号： G11B7/00

CPC分类号： G11B7/00456 ,  G11B7/126

摘要： According to one embodiment, in one embodiment of the invention, a laser drive circuit is provided with a first current source, a second drive current source, and a third current source. The control section selectively obtains a plurality of laser light use mode of controlling the from first to third current sources to use pulse laser light accompanying relaxation oscillation, and a complex laser light use mode of using laser light where laser pulses are combined, whose starting end has an abrupt impulse change portion caused by relaxation oscillation and whose intermediate section is a flat portion with a fixed intensity.

摘要翻译： 根据一个实施例，在本发明的一个实施例中，激光驱动电路设置有第一电流源，第二驱动电流源和第三电流源。 控制部选择性地获得多个激光使用模式，其控制从第一至第三电流源使用伴随弛豫振荡的脉冲激光，以及复合激光使用模式，其中使用激光脉冲组合的激光，其起始端 具有由松弛振动引起的突然脉冲变化部分，其中间部分是具有固定强度的平坦部分。

公开(公告)号：US20090141760A1

公开(公告)日：2009-06-04

申请号：US12260824

申请日：2008-10-29

申请人： Masahiro Saito ,  Takashi Usui ,  Kazuo Watabe ,  Keiichiro Yusu ,  Chosaku Noda ,  Nobuaki Kaji ,  Kazuto Kuroda

发明人： Masahiro Saito ,  Takashi Usui ,  Kazuo Watabe ,  Keiichiro Yusu ,  Chosaku Noda ,  Nobuaki Kaji ,  Kazuto Kuroda

IPC分类号： H01S3/00

CPC分类号： G11B7/1263

摘要： According to one embodiment, a drive control apparatus of a semiconductor laser includes a driving circuit which drives the semiconductor laser by applying pulses transiting from bias current to peak current to the semiconductor laser as laser driving current that causes relaxation oscillation of emission light intensity of the semiconductor laser, and a control circuit which controls the bias current such that the bias current has a predetermined ratio limiting fluctuation of a leading peak value of the relaxation oscillation occurring for each application of pulses relative to threshold current of the semiconductor laser. The control circuit changes the bias current to maintain the predetermined ratio relative to fluctuation of the threshold current.

摘要翻译： 根据一个实施例，半导体激光器的驱动控制装置包括驱动电路，该驱动电路通过施加从偏置电流流向峰值电流的脉冲来驱动半导体激光器作为激光驱动电流，该激光驱动电流引起半导体激光器的发射光强度的弛豫振荡 半导体激光器和控制偏置电流的控制电路，使得偏置电流相对于半导体激光器的阈值电流具有针对每次施加脉冲而产生的弛豫振荡的引导峰值的预定比例限制波动。 控制电路改变偏置电流以相对于阈值电流的波动保持预定的比率。

公开(公告)号：US20090109809A1

公开(公告)日：2009-04-30

申请号：US12258359

申请日：2008-10-24

申请人： Kazuto Kuroda ,  Kazuo Watabe ,  Keiichiro Yusu ,  Chosaku Noda ,  Nobuaki Kaji ,  Takashi Usui ,  Masahiro Saito

发明人： Kazuto Kuroda ,  Kazuo Watabe ,  Keiichiro Yusu ,  Chosaku Noda ,  Nobuaki Kaji ,  Takashi Usui ,  Masahiro Saito

IPC分类号： G11B7/00

CPC分类号： G11B7/1263 ,  G11B7/00456

摘要： According to one embodiment, a laser drive circuit includes a photodetector which receives part of laser light emitted from a laser element to a recording medium independently of reflection laser light reflected by the recording medium, and outputs an output corresponding to the strength thereof, an integration circuit which integrates the output from the photodetector for a predetermined time, and a setting circuit which sets the intensity of a laser drive current supplied to the laser element on the basis of the output from the integration circuit.

摘要翻译： 根据一个实施例，激光驱动电路包括光电检测器，其独立于由记录介质反射的反射激光，将从激光元件发射的激光的一部分接收到记录介质，并且输出与其强度对应的输出， 电路，其将来自光电检测器的输出积分预定时间;以及设置电路，其根据积分电路的输出设定提供给激光元件的激光驱动电流的强度。

公开(公告)号：US20090109816A1

公开(公告)日：2009-04-30

申请号：US12256365

申请日：2008-10-22

申请人： Takashi Usui ,  Kazuo Watabe ,  Keiichiro Yusu ,  Chosaku Noda ,  Kazuto Kuroda ,  Nobuaki Kaji ,  Masahiro Saito

发明人： Takashi Usui ,  Kazuo Watabe ,  Keiichiro Yusu ,  Chosaku Noda ,  Kazuto Kuroda ,  Nobuaki Kaji ,  Masahiro Saito

IPC分类号： G11B7/00

CPC分类号： G11B7/00456 ,  G11B7/1267

摘要： According to one embodiment, a calibration section controls an LD driving section so as to carry out test writing on a recording layer of an optical disc using a light pulse having relaxation oscillation, irradiates the test-written area with a reproduction laser beam so as to detect reflected light, and determine write strategy based on the detected result. A recording process is executed on the optical disc by using the light pulse having relaxation oscillation based on the write strategy determined by the calibration section.

摘要翻译： 根据一个实施例，校准部分控制LD驱动部分，以便使用具有弛豫振荡的光脉冲对光盘的记录层进行测试写入，用再现激光束照射测试写入区域，以便 检测反射光，并根据检测结果确定写入策略。 通过使用基于由校准部确定的写入策略的具有弛豫振荡的光脉冲在光盘上执行记录处理。

公开(公告)号：US08582399B2

公开(公告)日：2013-11-12

申请号：US13045782

申请日：2011-03-11

申请人： Kazuo Watabe ,  Hideo Ando ,  Sumitaka Maruyama ,  Yutaka Kashihara ,  Akihito Ogawa

发明人： Kazuo Watabe ,  Hideo Ando ,  Sumitaka Maruyama ,  Yutaka Kashihara ,  Akihito Ogawa

IPC分类号： G11B7/24 ,  G11B21/08

CPC分类号： G11B7/24035 ,  G11B7/0079 ,  G11B7/1267 ,  G11B7/24038 ,  G11B20/1217 ,  G11B2220/235 ,  G11B2220/2537

摘要： According to one embodiment, an information storage medium in which layer 0 and layer 1 are arranged from a read surface, a system lead-in area, data lead-in area, data area, and middle area are arranged from an inner circumference of the layer 0, and a system lead-out area, data lead-out area, data area, and middle area are arranged from an inner circumference of the layer 1. A guard track zone is arranged on a side of the data area in the data lead-out area, and a reference code zone, R physical format information zone, recording management zone, and drive test zone are arranged in the data lead-in area of the layer 0 and padding of the guard track zone of the data lead-out area is performed after padding of the drive test zone of data lead-in area and recording of the recording management zone.

摘要翻译： 根据一个实施例，从读取表面，系统导入区，数据导入区，数据区和中间区布置层0和层1的信息存储介质从 层0，并且从层1的内周布置有系统导出区域，数据导出区域，数据区域和中间区域。保护轨道区域布置在数据区域的一侧 引导区和参考代码区，R物理格式信息区，记录管理区和驱动测试区布置在数据引导区的数据导入区和数据引导区的保护轨道区的填充中， 在填充数据导入区域的驱动测试区域和记录管理区域的记录之后执行输出区域。

公开(公告)号：US08547816B2

公开(公告)日：2013-10-01

申请号：US13045707

申请日：2011-03-11

申请人： Kazuo Watabe ,  Hideo Ando ,  Sumitaka Maruyama ,  Yutaka Kashihara ,  Akihito Ogawa

发明人： Kazuo Watabe ,  Hideo Ando ,  Sumitaka Maruyama ,  Yutaka Kashihara ,  Akihito Ogawa

IPC分类号： G11B7/007 ,  G11B7/085

CPC分类号： G11B7/24035 ,  G11B7/0079 ,  G11B7/1267 ,  G11B7/24038 ,  G11B20/1217 ,  G11B2220/235 ,  G11B2220/2537

摘要： According to one embodiment, an information storage medium in which layer 0 and layer 1 are arranged from a read surface, a system lead-in area, data lead-in area, data area, and middle area are arranged from an inner circumference of the layer 0, and a system lead-out area, data lead-out area, data area, and middle area are arranged from an inner circumference of the layer 1. A guard track zone is arranged on a side of the data area in the data lead-out area, and a reference code zone, R physical format information zone, recording management zone, and drive test zone are arranged in the data lead-in area of the layer 0 and padding of the guard track zone of the data lead-out area is performed after padding of the drive test zone of data lead-in area and recording of the recording management zone.

公开(公告)号：US07345986B2

公开(公告)日：2008-03-18

申请号：US11562074

申请日：2006-11-21

申请人： Hideo Ando ,  Kazuo Watabe

发明人： Hideo Ando ,  Kazuo Watabe

IPC分类号： G11B7/24

CPC分类号： G11B27/24 ,  G11B7/0045 ,  G11B7/007 ,  G11B7/00745 ,  G11B20/1217 ,  G11B20/18 ,  G11B27/22 ,  G11B2007/0013 ,  G11B2020/1222 ,  G11B2020/1232 ,  G11B2020/1239 ,  G11B2020/1277 ,  G11B2020/1292 ,  G11B2020/1298 ,  G11B2220/216 ,  G11B2220/218 ,  G11B2220/235 ,  G11B2220/237 ,  G11B2220/2537 ,  G11B2220/2541 ,  G11B2220/2562 ,  G11B2220/2575 ,  G11B2220/2579

摘要： This invention achieves high-density recording while preventing recording units from overlapping. Recording is done to form a gap between predetermined recording units. Since this gap is formed, even when a rotation driving mechanism of a medium suffers rotation nonuniformity, two neighboring recording units never overlap each other, and destruction of recording data can be prevented.

公开(公告)号：US07339879B2

公开(公告)日：2008-03-04

申请号：US11562159

申请日：2006-11-21

申请人： Hideo Ando ,  Kazuo Watabe

发明人： Hideo Ando ,  Kazuo Watabe

IPC分类号： G11B7/24

CPC分类号： G11B27/24 ,  G11B7/0045 ,  G11B7/007 ,  G11B7/00745 ,  G11B20/1217 ,  G11B20/18 ,  G11B27/22 ,  G11B2007/0013 ,  G11B2020/1222 ,  G11B2020/1232 ,  G11B2020/1239 ,  G11B2020/1277 ,  G11B2020/1292 ,  G11B2020/1298 ,  G11B2220/216 ,  G11B2220/218 ,  G11B2220/235 ,  G11B2220/237 ,  G11B2220/2537 ,  G11B2220/2541 ,  G11B2220/2562 ,  G11B2220/2575 ,  G11B2220/2579

摘要： This invention achieves high-density recording while preventing recording units from overlapping. Recording is done to form a gap between predetermined recording units. Since this gap is formed, even when a rotation driving mechanism of a medium suffers rotation nonuniformity, two neighboring recording units never overlap each other, and destruction of recording data can be prevented.