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Development of compact auto focus actuator for camera phone by applying new electromagnetic configuration

2005; SPIE; Volume: 6048; Linguagem: Inglês

10.1117/12.648303

1996-756X

Myung-Jin Chung,

Engineering Applied Research

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 using finite element method and magnetic circuit analysis. The size of the developed actuator is reduced to 67.3% compared with actuator using previous electromagnetic configuration. From the performance test, the developed actuator has moving stroke of 0.4mm, hysteresis of 20μm, full stroke current of 100mA, and unit step motion of 10μm.