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    • 8. 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。
    • 9. 发明授权
    • Apparatus and method for focus control of read light irradiated on a
recording surface
    • 用于对照射在记录表面上的读取光进行聚焦控制的装置和方法
    • US6101157A
    • 2000-08-08
    • US104930
    • 1998-06-26
    • Alex BradshawKazushige KawanaMasakazu TakahashiYuichi KimikawaHitoshi YamazakiHideaki Watarihana
    • Alex BradshawKazushige KawanaMasakazu TakahashiYuichi KimikawaHitoshi YamazakiHideaki Watarihana
    • G11B7/00G11B7/085G11B7/09
    • G11B7/08511G11B7/0945G11B2007/0013G11B7/094G11B7/0941
    • Apparatus and method for focus control are devised to cope with a fluctuation of an optimum gain of a focus servo loop due to a difference between light reflectance of recording surfaces or the like and to allow an optimum focal position of read light to preferably trace a target recording surface. The focus control apparatus of the invention includes: reading device for generating a read signal of a recording medium 1; a focus servo loop for allowing an optimum converging position of the read light to trace the target recording surface in accordance with a focus error signal FE by using a focusing actuator to displace the optimum converging position of the read light in the optical axial direction; a level detecting unit of the read signal; a level detecting unit of an error signal FE; amplifiers and of a read signal RF and the error signal FE; and a control unit for driving the actuator so as to allow the optimum converging position of the read light to approach the recording surface in the set-up mode and for controlling gains of the amplifiers so that a detection level by the detecting unit in the set-up mode reaches a predetermined level and a detection level by a detecting unit reaches a predetermined level.
    • 用于聚焦控制的设备和方法被设计成能够应对由于记录表面等的光反射率之间的差异导致的聚焦伺服环路的最佳增益的波动,并且允许读取光的最佳焦点位置优选地追踪目标 记录表面。 本发明的聚焦控制装置包括:用于产生记录介质1的读取信号的读取装置; 聚焦伺服环,用于通过使用聚焦致动器来使读取光的最佳会聚位置根据聚焦误差信号FE跟踪目标记录表面,以使读取光在光轴方向上的最佳会聚位置移位; 读取信号的电平检测单元; 误差信号FE的电平检测单元; 放大器和读取信号RF和误差信号FE; 以及控制单元,用于驱动致动器,以便允许读取光的最佳会聚位置在建立模式下接近记录表面,并用于控制放大器的增益,使得检测单元在组中的检测水平 -up模式达到预定水平,并且检测单元的检测水平达到预定水平。