Design of a new triple electro-magnetic optical image stabilization actuator to compensate for hand trembling

Recently, the demand for a new two-axis driving actuator for optical image stabilization (OIS) system has increased in mobile devices such as digital cameras and digital camcorders. In this paper, we proposed a novel OIS actuator with triple electro-magnetic (TEM) circuits and a three-ball supporting mechanism for a digital camcorder and considered the driving force, magnetic spring, and moment equilibrium of the TEM circuits. To design the TEM circuits with the high sensitivity and adequate magnetic spring, the electro-magnetic circuit was improved. At first, a sensitivity analysis was performed using the design of experiment procedure. Based on these results, effective design parameters were selected and an objective function was defined and gradient-based optimization was carried out. Finally, the improved TEM OIS actuator was fabricated for a digital camcorder and the feasibility of the OIS actuator with the TEM circuits and three-ball supporting mechanism was verified and the performance was investigated experimentally. The experimental results indicated that the proposed OIS actuator exhibits sufficient performance with respect to sensitivity.