| 摘要 |
A focusing assembly ( 10 ) includes a holder ( 11 ), a voice coil actuator ( 20 ), a rotating tube ( 23 ), and an inner tube ( 31 ). The holder is covered by a cover ( 12 ) and has a guiding slot ( 112 ) defined therein. The rotating tube is received in the holder and includes a magnet element ( 21 ) fixed to an inner surface of the holder. A coil ( 22 ) is located in the magnetic field of the magnet element. The coil is wound on the outside of the rotating tube, which further has an internal thread ( 231 ) inside. The inner tube receives an image sensor ( 32 ) inside and has an external thread ( 311 ) outside screwed with the internal thread of the rotating tube. The inner tube, wound with the coil, rotates in reaction to the magnet element when a current is flowed through the coil, and the guiding block, coupled with the guiding slot, limits the axial movement of the inner tube and thereby offers thrust reversal to the inner tube in telescopic movement.
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