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    • 13. 发明授权
    • Tilt detection method and optical disk drive
    • 倾斜检测方法和光盘驱动器
    • US6128258A
    • 2000-10-03
    • US123404
    • 1998-07-28
    • Katsuhiko KimuraYoshiaki YamauchiSeiichi KatoNaruo Watanabe
    • Katsuhiko KimuraYoshiaki YamauchiSeiichi KatoNaruo Watanabe
    • G11B7/095G11B7/125G11B7/09
    • G11B7/126G11B7/0956G11B7/127
    • In an optical disk drive using as a light source a semiconductor laser having a main electrode and a plurality of subsidiary electrodes, a wave front of a generated laser beam is modulated by controlling injection currents to the plurality of subsidiary electrodes, in accordance with a change in signal outputs when the wave front is modulated, a tilt is detected between a direction normal to the surface of an optical disk and an objective lens optical axis, and in accordance with the detected tilt, the injection currents to the semiconductor laser are determined to correct the tilt. Since the tilt is detected and corrected through electrical modulation, the system can be made compact without using new components for tilt detection, and high speed control up to a high frequency becomes possible because there is no limit of the control bandwidth to be caused by sub-resonances in a high frequency band, like a mechanical actuator.
    • 在使用具有主电极和多个辅助电极的半导体激光器作为光源的光盘驱动器中,通过根据变化控制对多个辅助电极的注入电流来调制所产生的激光束的波前 在波前调制的信号输出中,在垂直于光盘表面的方向和物镜光轴之间检测到倾斜,并且根据检测到的倾斜,将确定到半导体激光器的注入电流被确定为 纠正倾斜。 由于通过电调制来检测和校正倾斜,所以可以使系统紧凑而不使用用于倾斜检测的新部件,并且由于没有由sub引起的控制带宽的限制,所以高达高频率的高速控制成为可能 - 在高频带中的谐振,如机械致动器。