유한요소해석을 이용한 휴대폰 자동 초점구동기의 낙하시험 모사

Recently, robustness against daily impact is important according to portablization and downsizing of mobile electronics. This test simulates the case when cellular phone slips through user’s hand while he is talking on the phone. This paper studies a drop test of auto focusing actuator for camera module in cellular phone. This component is composed of voice coil motor as an actuator and leaf spring as a guide and suspension. The leaf spring’s deformation is essential for test because its permanent distortion disables the focusing, and then, a high quality photograph can’t be obtained. Up to now the drop test was carried out after manufacturing real AF actuator. We propose a dropt test model which simulates the drop test based on FEA. Stress over Von Mises criterion lets the spring deformed permanently, and then AF actuator malfunctioned. It helps us to design and modify AF actuator without manufacturing the real product. And also, it saves the cost for the development of new products.