公开(公告)号：US20090109815A1

公开(公告)日：2009-04-30

申请号：US12260920

申请日：2008-10-29

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, an optical disc device includes a light source portion which applies laser light to an optical disc, a drive portion which supplies a drive current to the light source portion so as to cause the light source portion to apply laser light of light pulses having relaxation oscillation, and a controller which controls the drive portion to supply a drive current so as to cause the light source portion to emit laser light of (n−1)×N (N is an integral number) light pulses having relaxation oscillation with respect to a mark with recording mark length nT (n: integral number, T: channel clock) to be recorded on the optical disc.

摘要翻译： 根据一个实施例，光盘装置包括向光盘施加激光的光源部分，向光源部分提供驱动电流以使光源部分施加光的激光的驱动部分 具有弛豫振荡的脉冲和控制驱动部分提供驱动电流以使光源部分发出具有弛豫振荡的（n-1）×N（N为整数）光脉冲的激光的控制器， 相对于要记录在光盘上的具有记录标记长度nT（n：整数，T：通道时钟）的标记。

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：US20080101205A1

公开(公告)日：2008-05-01

申请号：US11928123

申请日：2007-10-30

申请人： Takashi Usui ,  Kazuto Kuroda

发明人： Takashi Usui ,  Kazuto Kuroda

IPC分类号： G11B7/00

CPC分类号： G11B7/1263

摘要： An optical disc apparatus includes a laser-light emitting element configured to emit laser light onto a writable and readable optical disc, a power detecting unit configured to detect a light power of the laser light emitted from the laser-light emitting element, and a power control unit configured to control a driving amount for the laser-light emitting element by feedback control so that the detected light power coincides with a target light power. The power control unit holds a driving amount obtained during a previous recording period until a current recording period, and uses the held driving amount as an initial driving amount for the feedback control in the current recording period when the current recording period starts.

摘要翻译： 一种光盘装置，包括：激光发光元件，被配置为向可写和可读光盘发射激光;功率检测单元，被配置为检测从激光发射元件发射的激光的光功率;以及功率 控制单元，被配置为通过反馈控制来控制激光发光元件的驱动量，使得检测到的光功率与目标光功率一致。 功率控制单元保持在前一个记录周期中获得的驱动量，直到当前记录周期，并且在当前记录周期开始的当前记录周期中，将保持的驱动量用作反馈控制的初始驱动量。

公开(公告)号：US20080056317A1

公开(公告)日：2008-03-06

申请号：US11848170

申请日：2007-08-30

申请人： Shinichiro Saito ,  Kazuto Kuroda

发明人： Shinichiro Saito ,  Kazuto Kuroda

IPC分类号： H01S3/00

CPC分类号： G11B7/126

摘要： To improve a recording speed and an optical waveform quality while lower power consumption in the laser driver circuit is achieved. In an optical disc apparatus including a laser driver circuit according to the present invention, a laser diode emits a laser light a power supply regulator supplies a predetermined power supply voltage to the laser driver circuit, a control micro computer performs a control to switch the predetermined power supply voltage supplied from the power supply regulator to the laser driver circuit in accordance with a recording time or a reproduction time.

摘要翻译： 提高记录速度和光学波形质量，同时实现激光驱动电路的低功耗。 在包括根据本发明的激光驱动器电路的光盘装置中，激光二极管发射激光，电源调节器向激光驱动电路提供预定的电源电压，控制微型计算机执行控制以切换预定的 根据记录时间或再现时间，从电源调节器提供给激光驱动电路的电源电压。

公开(公告)号：US20080056086A1

公开(公告)日：2008-03-06

申请号：US11848045

申请日：2007-08-30

申请人： Kazuto Kuroda

发明人： Kazuto Kuroda

IPC分类号： G11B7/00

CPC分类号： G11B7/1267 ,  G11B7/22 ,  G11B2007/0006

摘要： In order to compute a set value for a laser driver circuit for obtaining laser light having a predetermined irradiation power by using a calibration coefficient indicating manufacturing errors. In an optical disc device including a laser driver circuit according to the present invention, a laser diode emits laser light, a front monitor photo diode receives the emitted laser light to generate a reception light signal, an APC unit of the laser driver circuit compares the thus generated reception light signal with a target value related to the predetermined irradiation power previously set in the laser light to be emitted, a drive of the laser diode is controlled to match the signal to the target value, and a CPU uses at least one calibration coefficient to compute the set value for matching the reception light signal to the target value.

摘要翻译： 为了通过使用指示制造误差的校准系数来计算用于获得具有预定照射功率的激光的激光驱动电路的设定值。 在包括根据本发明的激光驱动电路的光盘装置中，激光二极管发射激光，前监视光电二极管接收发射的激光以产生接收光信号，激光驱动电路的APC单元将 从而产生具有预先设定在要发射的激光中的预定照射功率的目标值的接收光信号，激光二极管的驱动被控制以将信号与目标值相匹配，并且CPU使用至少一个校准 系数来计算用于将接收光信号与目标值匹配的设定值。

公开(公告)号：US20050117483A1

公开(公告)日：2005-06-02

申请号：US10995542

申请日：2004-11-24

申请人： Emi Maruyama ,  Kazuto Kuroda ,  Toshihiko Kaneshige

发明人： Emi Maruyama ,  Kazuto Kuroda ,  Toshihiko Kaneshige

IPC分类号： G11B20/10 ,  G11B7/00 ,  G11B7/005 ,  G11B7/007 ,  G11B27/10

CPC分类号： G11B7/00736 ,  G11B2007/0013

摘要： An information storage medium has a system lead-in area and a data lead-in area, and an area identifying circuit identifies whether a light beam irradiation area of an optical pickup head is at the system lead-in area or at the data lead-in area based on a reproduction signal provided from the optical pickup head. The area identifying circuit identifies the respective areas by using the number of zero crossings obtained from a signal, for example, into which the reproduction signal is binarized. An information reproducing circuit reproduces information from the reproduction signal based on the identified result by the area identifying circuit.

摘要翻译： 信息存储介质具有系统导入区和数据导入区，区域识别电路识别光学拾取头的光束照射区域是否在系统导入区或数据导入区， 基于从光学拾取头提供的再现信号。 区域识别电路通过使用从例如再现信号二值化的信号获得的过零点数来识别各个区域。 信息再现电路根据区域识别电路的识别结果从再现信号再现信息。

公开(公告)号：US08593926B2

公开(公告)日：2013-11-26

申请号：US13353474

申请日：2012-01-19

申请人： Kazuo Watabe ,  Kazuto Kuroda ,  Takashi Usui ,  Hideaki Okano

发明人： Kazuo Watabe ,  Kazuto Kuroda ,  Takashi Usui ,  Hideaki Okano

IPC分类号： G11B7/00

CPC分类号： G11B7/083 ,  G03H1/2286 ,  G03H2222/34 ,  G11B7/0065 ,  G11B7/09 ,  G11B7/1381 ,  G11B2007/0009

摘要： An information storage device includes an information recording medium, at least a single light source that emits laser light, an illuminating unit that illuminates substantially the same position of the information recording medium with two light rays generated from the laser light, in different directions, a light detecting unit that detects reflection light of the two light rays reflected from the information recording medium and outputs a detection signal, an operation unit that calculates position error information of the information recording medium based on the detection signal; and, a driving device that changes the position of the information recording medium based on the position error information.

摘要翻译： 信息存储装置包括：信息记录介质，至少一个发射激光的光源;照明单元，其以不同方向从激光产生的两束光照射基本相同位置的信息记录介质; 光检测单元，其检测从信息记录介质反射的两个光线的反射光并输出检测信号;运算单元，其基于检测信号计算信息记录介质的位置误差信息; 以及基于位置误差信息改变信息记录介质的位置的驱动装置。

公开(公告)号：US20120140606A1

公开(公告)日：2012-06-07

申请号：US13353474

申请日：2012-01-19

申请人： Kazuo Watabe ,  Kazuto Kuroda ,  Takashi Usui ,  Hideaki Okano

发明人： Kazuo Watabe ,  Kazuto Kuroda ,  Takashi Usui ,  Hideaki Okano

IPC分类号： G11B7/0065

CPC分类号： G11B7/083 ,  G03H1/2286 ,  G03H2222/34 ,  G11B7/0065 ,  G11B7/09 ,  G11B7/1381 ,  G11B2007/0009

摘要： An information storage device includes an information recording medium, at least a single light source that emits laser light, an illuminating unit that illuminates substantially the same position of the information recording medium with two light rays generated from the laser light, in different directions, a light detecting unit that detects reflection light of the two light rays reflected from the information recording medium and outputs a detection signal, an operation unit that calculates position error information of the information recording medium based on the detection signal; and, a driving device that changes the position of the information recording medium based on the position error information.

摘要翻译： 信息存储装置包括：信息记录介质，至少一个发射激光的光源;照明单元，其以不同方向从激光产生的两束光照射基本相同位置的信息记录介质; 光检测单元，其检测从信息记录介质反射的两个光线的反射光并输出检测信号;运算单元，其基于检测信号计算信息记录介质的位置误差信息; 以及基于位置误差信息改变信息记录介质的位置的驱动装置。

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：US20080144453A1

公开(公告)日：2008-06-19

申请号：US11809164

申请日：2007-05-31

申请人： Takashi Usui ,  Kazuto Kuroda ,  Masashi Ueno

发明人： Takashi Usui ,  Kazuto Kuroda ,  Masashi Ueno

IPC分类号： G11B7/00

CPC分类号： G11B7/1263 ,  G11B7/00456

摘要： According to one embodiment, in a data write operation, the average value of the emission power detected by a front monitor is obtained via a low-pass filter and a sample hold circuit. In the write operation, erase power controlled by an erase APC is obtained via a sample hold circuit. While an LD is emitting light with the erase power, an erase current is determined from the output voltage of the erase APC. On the basis of the average power, the erase power, the erase current, and a waveform of the recording pulse, a current-to-emission-power characteristic of the LD is estimated. Furthermore, on the basis of the current-to-emission-power characteristic, the peak power in the write operation of the LD are controlled.

摘要翻译： 根据一个实施例，在数据写入操作中，通过低通滤波器和采样保持电路获得由前监视器检测的发射功率的平均值。 在写操作中，通过采样保持电路获得由擦除APC控制的擦除功率。 当LD以擦除功率发光时，从擦除APC的输出电压确定擦除电流。 基于平均功率，擦除功率，擦除电流和记录脉冲的波形，估计LD的电流 - 发射功率特性。 此外，基于电流 - 发射功率特性，控制LD的写入动作中的峰值功率。