An optical anti-shake system with a tremor sensing module and compact linear piezomotors

In this study, a new piezomotor is presented, and an optical anti-shake image system using this piezomotor is also developed. Comparing with other linear piezomotors, this motor is simpler, compacter, and more powerful. The dimension of the motor is 16 mm(L) × 8 mm(W) × 1.5 mm(H), and the resonate frequency is 220 kHz. Moreover, the push force at operating voltage 10 Vpp is 15 g, and the power consumption is 0.23 W. Because of the long travel range:±2 mm and high maximum velocity:26 mm/s, it could satisfy the compensative displacement of the CMOS sensor caused by the hand tremor in a anti-shake image system. In this paper, a dynamic behavior of the piezomotor is investigated by COMSOL software, and the control algorithm in the optical anti-shake image system, including tremor sensing, motor position sensing, is also described.