Cantor Colburn LLP
Method for driving piezoelectric actuator, piezoelectric-actuator control circuit, and image-stabilization control circuit
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.
Sanyo Electric Co., Ltd. Fujifilm Corporation Sanyo Semiconductor Co., Ltd.
H G
H02N G03B
inventional inventional
Hideo Takezo Yukihiko Tetsuya Hisao
Yoshida Nagamitsu Shigeoka Tokoro Ito