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    • 3. 发明申请
    • Optical disc apparatus and recording power control method
    • 光盘装置和记录功率控制方法
    • US20080144453A1
    • 2008-06-19
    • US11809164
    • 2007-05-31
    • Takashi UsuiKazuto KurodaMasashi Ueno
    • Takashi UsuiKazuto KurodaMasashi Ueno
    • G11B7/00
    • G11B7/1263G11B7/00456
    • 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.
    • 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。
    • 6. 发明申请
    • OPTICAL DISC APPARATUS AND LASER-POWER CONTROL METHOD THEREFOR
    • 光盘设备及其激光功率控制方法
    • US20080101205A1
    • 2008-05-01
    • US11928123
    • 2007-10-30
    • Takashi UsuiKazuto Kuroda
    • Takashi UsuiKazuto Kuroda
    • G11B7/00
    • G11B7/1263
    • 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.
    • 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。
    • 7. 发明申请
    • INFORMATION REPRODUCTION APPARATUS AND METHOD FOR CONTROLLING SAME
    • 信息再现装置及其控制方法
    • US20120008476A1
    • 2012-01-12
    • US13238612
    • 2011-09-21
    • Kazuto KurodaKazuo WatabeHideaki OkanoAkihito OgawaTakashi Usui
    • Kazuto KurodaKazuo WatabeHideaki OkanoAkihito OgawaTakashi Usui
    • G11B7/135
    • G11B7/083G11B7/08564G11B7/09G11B7/127
    • According to one embodiment, an information reproduction apparatus includes an information acquisition unit, an error detection unit, and a control unit. The information acquisition unit is configured to irradiate a reference beam, convert the reference beam into a luminance signal, and output the luminance signal when reproducing an information recording Medium. The error detection unit is configured to detect at least one selected from a first error and a second error by extracting a feature extraction quantity from the luminance signal. The first error is of an irradiation angle of the reference beam. The second error is of at least one selected from a temperature and a wavelength of the reference beam. The control unit is configured to control at least one selected from the irradiation angle and the at least one selected from the reproduction temperature and the wavelength of the reference beam using the second error.
    • 根据一个实施例,信息再现设备包括信息获取单元,错误检测单元和控制单元。 信息获取单元被配置为照射参考光束,将参考光束转换成亮度信号,并且在再现信息记录介质时输出亮度信号。 误差检测单元被配置为通过从亮度信号提取特征提取量来检测从第一误差和第二误差中选出的至少一个。 第一误差是参考光束的照射角度。 第二误差是从参考光束的温度和波长中选出的至少一个。 控制单元被配置为使用第二误差来控制从照射角度和从再现温度和参考光束的波长中选择的至少一个中选择的至少一个。
    • 9. 发明申请
    • LASER OUTPUT CONTROL DEVICE, INFORMATION RECORDING AND REPRODUCING DEVICE, AND LASER OUTPUT CONTROL METHOD
    • 激光输出控制装置,信息记录和再现装置以及激光输出控制方法
    • US20090059746A1
    • 2009-03-05
    • US12201617
    • 2008-08-29
    • Kazuto KurodaTakashi Usui
    • Kazuto KurodaTakashi Usui
    • G11B7/00
    • G11B7/126G11B7/0045
    • According to one embodiment, to solve a new problem which has been produced due to adoption of a recording method using relaxation oscillation, the laser output control device suppresses unnecessary relaxation oscillation while increasing an averaged light quantity between recording pulses to obtain reflected light quantity which is necessary for tracking and focus controlling. A laser modulation control circuit includes a recording pulse output unit which outputs recording pulses for making relaxation oscillation as the recording pulses, a bias current output unit which outputs a constant bias current between the recording pulses, and a high-frequency overlap unit which overlaps the high-frequency signal on the constant bias current between the recording pulses, and controls so as to have times at which current values at a start edge and an end edge of the high-frequency signal are almost consistent with a value of the constant bias current.
    • 根据一个实施例,为了解决由于采用使用松弛振荡的记录方法而产生的新问题,激光输出控制装置抑制不必要的松弛振荡,同时增加记录脉冲之间的平均光量,以获得反射光量 跟踪和聚焦控制所必需的。 激光调制控制电路包括输出记录脉冲作为记录脉冲的记录脉冲的记录脉冲输出单元,在记录脉冲之间输出恒定偏置电流的偏置电流输出单元和与记录脉冲重叠的高频重叠单元 高频信号对记录脉冲之间的恒定偏置电流进行控制,并进行控制,以使得高频信号的起始边缘和末端边缘处的电流值几乎与恒定偏置电流的值一致 。
    • 10. 发明申请
    • OPTICAL DISK DEVICE AND CONTROL METHOD THEREOF
    • 光盘设备及其控制方法
    • US20080159101A1
    • 2008-07-03
    • US11840716
    • 2007-08-17
    • Masahiro SaitoKazuto KurodaTakashi Usui
    • Masahiro SaitoKazuto KurodaTakashi Usui
    • G11B7/00
    • G11B7/093G11B7/094G11B7/0941G11B7/0956G11B11/10576
    • Disclosed is an optical disk device including: an objective lens unit having an objective lens and a lens holder; an elastic supporting member supporting displaceably the objective lens unit on a body of an optical head; first and second drive sections applying respectively driving forces to first and second driven positions on the objective lens unit opposed across a position of a center of mass of the objective lens unit in a direction orthogonal to an optical axis of the objective lens; and a driving force adjustment section adjusting allocation of the driving forces respectively applied to the first and second driven positions so that a possible influence of a displacement force in a tilt direction on a displacement force in a focusing direction at the position of the center of mass when the displacement forces act on the objective lens unit is avoided.
    • 公开了一种光盘装置,包括:具有物镜和透镜保持器的物镜单元; 弹性支撑构件,其将所述物镜单元可移动地支撑在光学头的主体上; 第一驱动部和第二驱动部将与物镜的质心的位置对置的物镜的第一和第二驱动位置分别施加到与物镜的光轴正交的方向上的驱动力; 以及驱动力调节部,调整分别施加到第一和第二被驱动位置的驱动力的分配,使得倾斜方向上的位移力对聚焦方向上的位移力在质心位置的可能影响 当避免了作用在物镜单元上的位移力时。