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    • 2. 发明授权
    • Focus control apparatus for multilayer optical recording medium
    • 用于多层光记录介质的聚焦控制装置
    • US06246646B1
    • 2001-06-12
    • US09114880
    • 1998-07-14
    • Hiroyuki AbeShinichi NaoharaTakeshi SatoAlex BradshawKazushige KawanaHideaki WatarihanaNorio MatsudaKenichi Takahashi
    • Hiroyuki AbeShinichi NaoharaTakeshi SatoAlex BradshawKazushige KawanaHideaki WatarihanaNorio MatsudaKenichi Takahashi
    • G11B709
    • G11B7/08511G11B7/0948G11B2007/0013
    • A focus control apparatus for a multilayer optical recording medium performs an adequate focus jump on a multilayer optical recording medium. Threshold values are set according to the amount of a level change in a focus error signal of a loaded multilayer optical recording medium, and focus jump control is conducted based on the result of comparison between the level of the focus error signal and the set threshold values. Positive and negative threshold values to be compared with the level of the focus error signal to detect a zero-crossing point of the focus error signal are set in accordance with the amount of a level change in the focus error signal, after which an acceleration operation of the focus actuator is started in response to a focus jump instruction to shift the focus position of read light for a focus jump, the acceleration operation is stopped in accordance with zero-crossing detection, a deceleration operation of the focus actuator is started thereafter and is stopped in accordance with zero-crossing detection, so that the operation returns to the focus servo operation.
    • 用于多层光学记录介质的聚焦控制装置在多层光学记录介质上执行适当的聚焦跳跃。 根据加载的多层光学记录介质的聚焦误差信号中的电平变化量设定阈值,并且基于聚焦误差信号的电平与设定的阈值之间的比较结果进行聚焦跳跃控制 。 根据聚焦误差信号的电平变化量,设定要与聚焦误差信号的电平进行比较以检测聚焦误差信号的过零点的正和负阈值,然后加速操作 响应于聚焦跳转指令开始移动聚焦跳跃的读取光的焦点位置,根据过零检测停止加速操作,此后开始聚焦致动器的减速操作,并且 根据过零检测停止,使得操作返回到聚焦伺服操作。
    • 3. 发明授权
    • Tilt servo apparatus and control method thereof
    • 倾斜伺服装置及其控制方法
    • US06690632B1
    • 2004-02-10
    • US09548263
    • 2000-04-12
    • Takeshi SatoMotoi KimuraAlex BradshawNorio MatsudaShinichi Naohara
    • Takeshi SatoMotoi KimuraAlex BradshawNorio MatsudaShinichi Naohara
    • G11B390
    • G11B7/1369G11B7/0956G11B7/13927
    • A tilt servo apparatus which can correct a tilt error at a high speed and with high precision irrespective of a magnitude of the tilt error even if a response speed of a liquid crystal device decreases is provided. An amount of change and an increase/decrease of a signal intensity are detected by changing a correction value of a tilt error correcting arrangement by a first correction width, and a correction width of the correction value and a correcting direction are determined on the basis of the detection result. When the amount of change of the signal intensity is smaller than a predetermined amount of change, the correction width is changed to a second correction width which is smaller than a first correction width. When it is larger than the predetermined amount of change, the correction width is changed to a third correction width larger than the first correction width. The correction width is also determined in accordance with a change in environmental temperature.
    • 提供了即使液晶装置的响应速度降低,也可以与倾斜误差的大小无关地以高精度校正倾斜误差的倾斜伺服装置。 通过将倾斜误差校正装置的校正值改变第一校正宽度来检测信号强度的变化量和增加/减小,并且基于校正值和校正方向确定校正值和校正方向的校正宽度 检测结果。 当信号强度的变化量小于预定量的变化量时,校正宽度变为小于第一校正宽度的第二校正宽度。 当其大于预定量的变化量时,校正宽度变为大于第一校正宽度的第三校正宽度。 校正宽度也根据环境温度的变化来确定。
    • 6. 发明授权
    • Focus control apparatus for multilayer optical recording medium
    • 用于多层光记录介质的聚焦控制装置
    • US06147942A
    • 2000-11-14
    • US112004
    • 1998-07-08
    • Hiroyuki AbeTakeshi SatoKazushige KawanaHideaki WatarihanaShinichi NaoharaMotoi KimuraYuichi KimikawaMasakazu Takahashi
    • Hiroyuki AbeTakeshi SatoKazushige KawanaHideaki WatarihanaShinichi NaoharaMotoi KimuraYuichi KimikawaMasakazu Takahashi
    • G11B7/00G11B7/085G11B7/09
    • G11B7/08511G11B2007/0013G11B7/08529G11B7/0945
    • A focus control apparatus for a multilayer optical recording medium which performs an appropriate focus jump on a multilayer optical recording medium. This focus control apparatus implements such focus jump control as to temporarily release a focus servo on one layer of a loaded multilayer optical recording medium, shift the focus position of read light on another target layer and then restart the focus servo on the another target layer, detects an ambient temperature, sets a drive signal condition according to the temperature detection output, and moves the focus position of the read light under the set drive signal condition. Specifically, this apparatus generates an acceleration signal to start moving the focus position of read light and a deceleration signal to decelerate movement of the focus position of the read light, as drive signals for a focus actuator in order to execute a focus jump operation, detects an ambient temperature of the focus actuator, and sets signal conditions for the acceleration signal and the deceleration signal according to the detected temperature.
    • 一种用于在多层光学记录介质上执行适当的聚焦跳跃的多层光学记录介质的聚焦控制装置。 该聚焦控制装置实现这样的聚焦跳跃控制,以暂时释放加载的多层光记录介质的一层上的聚焦伺服,将读取光的聚焦位置移动到另一目标层上,然后在另一目标层上重新启动聚焦伺服, 检测环境温度,根据温度检测输出设定驱动信号状态,并在设定的驱动信号条件下移动读取光的聚焦位置。 具体地,该装置产生加速度信号,开始移动读取光的聚焦位置和减速信号,以减慢读取光的焦点位置的移动,作为聚焦致动器的驱动信号,以执行聚焦跳跃操作,检测 聚焦致动器的环境温度,并且根据检测到的温度设置用于加速度信号和减速信号的信号条件。