Auto-focus actuator, which is used to move a lens module in the mobile phone having a camera module, is developed. Camera module containing auto-focus actuator requires to minimize total size because of application area such as mobile phone, digital c...
Auto-focus actuator, which is used to move a lens module in the mobile phone having a camera module, is developed. Camera module containing auto-focus actuator requires to minimize total size because of application area such as mobile phone, digital camera, and personal digital assistant. There are stepping motor, voice coil motor, and piezoelectric motor as auto-focus actuator. In this paper, voice coil motor having new electromagnetic configuration is proposed. And actuator using proposed voice coil motor is developed by magnetic field analysis and optimal design method. The size of developed actuator is reduced to 67.3% compared with actuator using previous electromagnetic configuration. From the performance test, developed actuator has moving stroke of 0.4㎜, full stroke current of 100㎃, and unit step motion of 10㎛.