| 摘要 |
An auto-focusing device for lens comprises a lens holder, a sensor holder, a permanent magnet set, a yoke and a base. The lens holder holds a lens barrel and is wound around with at least two coils wound in opposite directions. The sensor holder holds an image sensor. The permanent magnet set includes at least two permanent magnets stacked together with opposing poles to form a multi-pole permanent magnet set. The permanent magnet set is furnished on the periphery of lens holder and corresponding to the two coils. The permanent magnet set is disposed on the yoke to form a close-loop magnetism so as to increase the density of magnetic lines and the efficiency of magnetic force, save power consumption, and extend the service life of device.
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