公开(公告)号：US20070121446A1

公开(公告)日：2007-05-31

申请号：US11493822

申请日：2006-07-27

申请人： Manabu Shiozawa ,  Kazutoshi Shigeta

发明人： Manabu Shiozawa ,  Kazutoshi Shigeta

IPC分类号： G11B19/00

CPC分类号： G11B7/1369 ,  G11B7/126 ,  G11B7/1263 ,  G11B7/128

摘要： The object of this invention is to provide an optical disc apparatus and an optical disc reproducing method that can realize an excellent reproducing operation by suppressing noise in the optical disc apparatus using an optical attenuator. In order to solve this object, a control voltage of the optical attenuator is changed according to reproduction power when reproducing the optical disc and an ambient temperature of the optical attenuator. In addition, the amplitude of a high frequency current for driving a laser diode is changed according to an attenuation factor of the optical attenuator.

摘要翻译： 本发明的目的是提供一种通过使用光衰减器抑制光盘装置中的噪声来实现优异的再现操作的光盘装置和光盘再现方法。 为了解决这个问题，光衰减器的控制电压根据再现光盘的再现功率和光衰减器的环境温度而改变。 此外，用于驱动激光二极管的高频电流的振幅根据光衰减器的衰减系数而改变。

公开(公告)号：US07869333B2

公开(公告)日：2011-01-11

申请号：US11493822

申请日：2006-07-27

申请人： Manabu Shiozawa ,  Kazutoshi Shigeta

发明人： Manabu Shiozawa ,  Kazutoshi Shigeta

IPC分类号： G11B7/00

CPC分类号： G11B7/1369 ,  G11B7/126 ,  G11B7/1263 ,  G11B7/128

摘要： The object of this invention is to provide an optical disc apparatus and an optical disc reproducing method that can realize an excellent reproducing operation by suppressing noise in the optical disc apparatus using an optical attenuator. In order to solve this object, a control voltage of the optical attenuator is changed according to reproduction power when reproducing the optical disc and an ambient temperature of the optical attenuator. In addition, the amplitude of a high frequency current for driving a laser diode is changed according to an attenuation factor of the optical attenuator.

摘要翻译： 本发明的目的是提供一种通过使用光衰减器抑制光盘装置中的噪声来实现优异的再现操作的光盘装置和光盘再现方法。 为了解决这个问题，光衰减器的控制电压根据再现光盘的再现功率和光衰减器的环境温度而改变。 此外，用于驱动激光二极管的高频电流的振幅根据光衰减器的衰减系数而改变。

公开(公告)号：US20070127336A1

公开(公告)日：2007-06-07

申请号：US11429442

申请日：2006-05-08

申请人： Mitsunori Kobayashi ,  Koichi Watanabe ,  Kazutoshi Shigeta

发明人： Mitsunori Kobayashi ,  Koichi Watanabe ,  Kazutoshi Shigeta

IPC分类号： G11B7/12

CPC分类号： G11B7/1267 ,  G11B7/006

摘要： According to the present invention, an optimum value of a laser power for recording data on a high-density optical disk can be set with high accuracy. A test signal whose erase power Pe is fixed and recording power Pw is varied is recorded on the optical disk. The recorded signal is reproduced and a β value representing asymmetry of the reproduced signal is obtained for each recording power. An optimum recording power Pwo is set from a recording power with which the obtained β value becomes a target β value. Hereby, the fixed erase power Pe is determined from measurement results of a value of a modulation factor M of another test signal recorded. Alternatively, the fixed erase power Pe follows strategy information defined in advance for the optical disk. Or Pe≈0 is used regardless of the optical disk.

摘要翻译： 根据本发明，可以高精度地设置用于在高密度光盘上记录数据的激光功率的最佳值。 其擦除功率Pe固定并且记录功率Pw变化的测试信号被记录在光盘上。 记录的信号被再现，并且对于每个记录功率获得表示再现信号的不对称性的β值。 从获得的β值成为目标β值的记录功率设定最佳记录功率Pwo。 因此，固定的擦除功率Pe由记录的另一测试信号的调制度M的值的测量结果确定。 或者，固定擦除功率Pe遵循预先为光盘定义的策略信息。 或者使用Pe≈0，而不考虑光盘。

公开(公告)号：US20070171805A1

公开(公告)日：2007-07-26

申请号：US11641298

申请日：2006-12-18

申请人： Kazutoshi Shigeta ,  Osamu Kawamae

发明人： Kazutoshi Shigeta ,  Osamu Kawamae

IPC分类号： G11B7/00

CPC分类号： G11B7/1263

摘要： In laser power control, optical and electronic components are subjected to correction on their temperature characteristics to stabilize write/read characteristics. The present invention comprises a power detector which detects the power of laser light generated by a pickup, a temperature detector which detects the temperature in the pickup, a calculating unit which calculates a target value of the power of laser light generated by the pickup according to the detected temperature, and a power control unit which performs control so that the pickup generates laser light with the power based on the target value. The calculating unit sets a target value so that the characteristics of an objective lens and the power detector in the pickup may be corrected based on their temperature characteristics.

摘要翻译： 在激光功率控制中，光学和电子元件对其温度特性进行校正，以稳定写入/读取特性。 本发明包括检测由拾取器产生的激光的功率的功率检测器，检测拾取器中的温度的温度检测器，计算单元，其计算由拾取器产生的激光的功率的目标值，根据 检测温度，以及功率控制单元，其执行控制，使得拾取器基于目标值产生具有功率的激光。 计算单元设定目标值，使得可以基于其温度特性校正拾取器中的物镜和功率检测器的特性。