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Design of Compact Linear Electromagnetic Actuator for Auto-Focusing in Phone Camera

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3 Author(s)
Lai, L.K. ; Dept. of Mech. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Tsai, C.L. ; Liu, T.S.

This paper proposes a novel linear electromagnetic actuator (LEA) for auto-focusing of compact phone cameras. An LEA consists of permanent magnets, iron cores, and coils, which are all magnetic circuit components. When coils are powered, induced magnetic field generates N and S poles around iron cores. Thus, unlike voice coil motors (VCMs) that employ the Lorentz force, the motion of the moving part in this study is arisen from a property-same poles repel each other while opposite poles attract each other. When compared to conventional VCM actuators in simulation results, the proposed LEA generates larger force, whereas using smaller current.

Published in:

Magnetics, IEEE Transactions on  (Volume:47 ,  Issue: 12 )