公开(公告)号：US20060092807A1

公开(公告)日：2006-05-04

申请号：US11295519

申请日：2005-12-07

申请人： Kazuto Kuroda

发明人： Kazuto Kuroda

IPC分类号： G11B20/12 ,  G11B27/36 ,  G11B20/10 ,  G11B5/09 ,  H04N5/76

CPC分类号： G11B20/1217 ,  G11B7/0045 ,  G11B7/007 ,  G11B2007/0013

摘要： An optical disk recording apparatus is configured to record information on a multilayer optical disk having a general information recording area for recording general information and a management information recording area for recording management information which manages general information recorded on this general information recording area. In this optical disk recording apparatus, meaningless information is recorded on an unrecorded area in the management information recording area of the optical disk.

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：US07274630B2

公开(公告)日：2007-09-25

申请号：US10391603

申请日：2003-03-20

申请人： Sumitaka Maruyama ,  Masahiko Tanaka ,  Hideaki Ohsawa ,  Maho Kuwahara ,  Akihito Ogawa ,  Kazuto Kuroda

发明人： Sumitaka Maruyama ,  Masahiko Tanaka ,  Hideaki Ohsawa ,  Maho Kuwahara ,  Akihito Ogawa ,  Kazuto Kuroda

IPC分类号： G11B7/095

CPC分类号： G11B7/08511

摘要： This invention relates to a focus control apparatus having a controller which generates a control signal and performs focus operation when the peak timing of a focus sum signal based on reflected light and the zero-crossing timing of a focus error signal are detected to substantially coincide with each other in supplying a control signal to a lens actuator driver for supplying a driving signal to a lens actuator for driving a lens. The invention also relates to an optical disk apparatus using the focus control apparatus. By detecting coincidence of the two timings, two reflected waves are discriminated, and stable focus operation is achieved.

摘要翻译： 本发明涉及一种具有控制器的聚焦控制装置，当控制器产生控制信号并且当基于反射光的聚焦和信号的峰值定时和聚焦误差信号的过零定时被检测到基本上与 彼此提供控制信号到镜头致动器驱动器，用于向驱动透镜的透镜致动器提供驱动信号。 本发明还涉及使用聚焦控制装置的光盘装置。 通过检测两个定时的一致性，鉴别出两个反射波，并且实现了稳定的聚焦操作。

公开(公告)号：US20070153670A1

公开(公告)日：2007-07-05

申请号：US11689565

申请日：2007-03-22

申请人： Yuji NAGAI ,  Chosaku Noka ,  Akihito Ogawa ,  Kazuto Kuroda

发明人： Yuji NAGAI ,  Chosaku Noka ,  Akihito Ogawa ,  Kazuto Kuroda

IPC分类号： G11B7/24

摘要： Address information is formed by M wobbles (integer M is the number of wobble waves) per bit as a basic unit, and is NRZ-recorded. Also, a sync signal used in sync detection of the address information is formed by N wobbles per bit as a basic unit (integer N is the number of wobble waves and M=2N). The sync signal with such configuration (6 wobbles per bit) is recorded on the head side of the address information (12 wobbles per bit). In this way, even when external noise is large, a modulated wobble signal can be demodulated more accurately.

摘要翻译： 地址信息由每个位的M个摆动（整数M是摆动波数）作为基本单位形成，并且被NRZ记录。 此外，用于地址信息的同步检测的同步信号由每位N个摆动形成为基本单位（整数N是摆动波数，M = 2N）。 具有这种配置的同步信号（每位6个摆动）被记录在地址信息的头侧（每位12个摆动）。 以这种方式，即使当外部噪声大时，可以更精确地解调调制的摆动信号。

公开(公告)号：US20060077798A1

公开(公告)日：2006-04-13

申请号：US11238015

申请日：2005-09-29

申请人： Kazuto Kuroda ,  Yasushi Higashiyama ,  Hiroharu Satoh

发明人： Kazuto Kuroda ,  Yasushi Higashiyama ,  Hiroharu Satoh

IPC分类号： G11B7/00

CPC分类号： G11B7/005 ,  G11B7/0906 ,  G11B7/0941 ,  G11B20/22

摘要： An optical disk apparatus of the invention includes an optical pickup which irradiates an optical disk with a laser beam, a light-reception unit including a first light-reception element and a second light-reception element, the light-reception unit receiving the laser beam reflected from the optical disk to provide a first photodetection signal and a second photodetection signal corresponding to the reflected laser beam, measuring units and which receive the first and second photodetection signals from the optical pickup to measure propagation delay time difference between the first and second photodetection signals, a delay unit which delays the first and second photodetection signals based on the signal propagation delay time difference such that delay times of the first and second photodetection signals are equalized to each other, and a signal processing circuit which processes the first and second photodetection signals delayed by the delay unit, and provides the processed signals.

摘要翻译： 本发明的光盘装置包括：光学拾取器，其用激光束照射光盘;受光单元，包括第一光接收元件和第二光接收元件;光接收单元接收激光束 从光盘反射以提供对应于反射激光束的第一光电检测信号和第二光电检测信号，测量单元，并且从光学拾取器接收第一和第二光电检测信号，以测量第一和第二光电检测之间的传播延迟时间差 信号，延迟单元，其基于所述信号传播延迟时间差延迟所述第一和第二光电检测信号，使得所述第一和第二光电检测信号的延迟时间彼此相等;以及信号处理电路，其处理所述第一和第二光电检测 由延迟单元延迟的信号，并提供经处理的信号 s。

公开(公告)号：US06996049B2

公开(公告)日：2006-02-07

申请号：US10107295

申请日：2002-03-28

申请人： Kazuto Kuroda

发明人： Kazuto Kuroda

IPC分类号： G11B7/00

CPC分类号： G11B20/1217 ,  G11B7/0045 ,  G11B7/007 ,  G11B2007/0013

摘要： An optical disk recording apparatus is configured to record information on a multilayer optical disk having a general information recording area for recording general information and a management information recording area for recording management information which manages general information recorded on this general information recording area. In this optical disk recording apparatus, meaningless information is recorded on an unrecorded area in the management information recording area of the optical disk.

摘要翻译： 光盘记录装置被配置为在具有用于记录一般信息的一般信息记录区域的多层光盘上记录信息，以及用于记录管理记录在该一般信息记录区域上的通用信息的管理信息的管理信息记录区域。 在该光盘记录装置中，无光信息被记录在光盘的管理信息记录区域中的未记录区域上。