公开(公告)号：US20100271700A1

公开(公告)日：2010-10-28

申请号：US12754030

申请日：2010-04-05

申请人： Tetsuya TOKORO ,  Yukihiko SHIGEOKA ,  Hisao ITO ,  Hideo YOSHIDA ,  Takezo NAGAMITSU

发明人： Tetsuya TOKORO ,  Yukihiko SHIGEOKA ,  Hisao ITO ,  Hideo YOSHIDA ,  Takezo NAGAMITSU

IPC分类号： G02B27/64 ,  H02N2/06

CPC分类号： G03B5/00 ,  H02N2/062

摘要： Abnormal noise generated while driving a piezoelectric actuator is prevented. A pulse-generation circuit is capable of selectively generating a displacement pulse and a stationary pulse as a drive pulse for application to a piezoelectric element, the displacement pulse having a duty ratio for causing a lens to be displaced by a predetermined step width, and the stationary pulse having a duty ratio for causing the lens to remain stationary in a current position. The pulse-generation circuit controls the production of the drive pulse continuously for a plurality of times within the servo control cycle, causes the displacement pulse to be produced when the remainder of a required amount of displacement is equal to or greater than a threshold value, and causes the stationary pulse to be continuously produced until the initiation of the next servo control cycle when the remainder is less than the threshold value.

摘要翻译： 防止在驱动压电致动器时产生的异常噪声。 脉冲发生电路能够选择性地产生位移脉冲和静止脉冲作为施加到压电元件的驱动脉冲，所述位移脉冲具有使透镜以预定的步长位移的占空比，并且 具有使透镜在当前位置保持静止的占空比的固定脉冲。 脉冲发生电路在伺服控制周期内连续地控制驱动脉冲的产生多次，当所需的位移量的余数等于或大于阈值时，产生位移脉冲， 并且当余数小于阈值时，使得静止脉冲被连续地产生直到下一个伺服控制周期的开始。