公开(公告)号：US07746748B2

公开(公告)日：2010-06-29

申请号：US11947974

申请日：2007-11-30

申请人： Toshimitsu Kaku ,  Kazuhide Hamada

发明人： Toshimitsu Kaku ,  Kazuhide Hamada

IPC分类号： G11B7/00

CPC分类号： G11B7/0953 ,  G11B7/0941 ,  G11B7/126

摘要： Due to the axial runout of an optical disc, a frequency of a high-frequency current to be superimposed onto a DC current could not be maintained. In order to solve the problem described above, a drive signal is generated by superimposing a high-frequency signal onto a DC current, the drive signal is applied to a laser beam light source, thereby the light source is driven; and a servo signal at a signal level corresponding to a defocus amount of the laser beam relative to the surface of the optical disc is generated based on a reflected light of the laser beam from the recording surface of the optical disc, and a low-frequency component of the servo signal is extracted, and thereby the frequency of the high-frequency signal to be superimposed onto the DC current in the light source driver is controlled based on the low-frequency component of the servo signal.

摘要翻译： 由于光盘的轴向跳动，不能保持叠加在直流电流上的高频电流的频率。 为了解决上述问题，通过将高频信号叠加在直流电流上来产生驱动信号，驱动信号被施加到激光束光源，从而驱动光源; 并且基于来自光盘的记录表面的激光束的反射光产生与激光束相对于光盘表面的散焦量对应的信号电平的伺服信号，并且低频 提取伺服信号的分量，从而基于伺服信号的低频分量来控制要叠加在光源驱动器中的DC电流上的高频信号的频率。

公开(公告)号：US20080253238A1

公开(公告)日：2008-10-16

申请号：US11947974

申请日：2007-11-30

申请人： Toshimitsu Kaku ,  Kazuhide Hamada

发明人： Toshimitsu Kaku ,  Kazuhide Hamada

IPC分类号： G11B7/00

CPC分类号： G11B7/0953 ,  G11B7/0941 ,  G11B7/126

摘要： Due to the axial runout of an optical disc, a frequency of a high-frequency current to be superimposed onto a DC current could not be maintained. In order to solve the problem described above, a drive signal is generated by superimposing a high-frequency signal onto a DC current, the drive signal is applied to a laser beam light source, thereby the light source is driven; and a servo signal at a signal level corresponding to a defocus amount of the laser beam relative to the surface of the optical disc is generated based on a reflected light of the laser beam from the recording surface of the optical disc, and a low-frequency component of the servo signal is extracted, and thereby the frequency of the high-frequency signal to be superimposed onto the DC current in the light source driver is controlled based on the low-frequency component of the servo signal.

摘要翻译： 由于光盘的轴向跳动，不能保持叠加在直流电流上的高频电流的频率。 为了解决上述问题，通过将高频信号叠加在直流电流上来产生驱动信号，驱动信号被施加到激光束光源，从而驱动光源; 并且基于来自光盘的记录表面的激光束的反射光产生与激光束相对于光盘表面的散焦量对应的信号电平的伺服信号，并且低频 提取伺服信号的分量，从而基于伺服信号的低频分量来控制要叠加在光源驱动器中的DC电流上的高频信号的频率。

公开(公告)号：US20080175111A1

公开(公告)日：2008-07-24

申请号：US11858933

申请日：2007-09-21

申请人： Kazuhide Hamada

发明人： Kazuhide Hamada

IPC分类号： G11B7/00

CPC分类号： G11B7/13927 ,  G11B7/0901

摘要： Provided is an optical disc device and a control method for the same that are capable of shortening processing time for spherical aberration correction amount adjustment. The optical disc device includes: a spherical aberration corrector that corrects spherical aberration of a light beam on an optical disc; and a tracking controller that performs tracking control based on a tracking error signal. In the spherical aberration correction amount adjustment by the spherical aberration corrector, the spherical aberration corrector is arranged so that: it holds a tracking error signal immediately before an spherical aberration correction amount is changed, and performs the tracking control based on the held tracking error signal while the spherical aberration corrector is changing the spherical aberration correction amount; or it moves a light beam scanning position on the optical disc to a predetermined track while the spherical aberration corrector is changing the spherical aberration correction amount.

摘要翻译： 提供了一种能够缩短球面像差校正量调整的处理时间的光盘装置及其控制方法。 光盘装置包括：球面像差校正器，其校正光盘上的光束的球面像差; 以及跟踪控制器，其基于跟踪误差信号执行跟踪控制。 在由球面像差校正器进行的球面像差校正量调整中，球面像差校正器被布置为：其在球面像差校正量改变之前保持跟踪误差信号，并且基于所保持的跟踪误差信号执行跟踪控制 而球面像差校正器正在改变球面像差校正量; 或者它将光盘上的光束扫描位置移动到预定轨迹，同时球面像差校正器正在改变球面像差校正量。