Patent ID: 7477462
Filing Date: 2009-01-13
Classification: G02B

Abstract:
1. A lens module comprising a rectangular base, two conductive plates, an insulation spacer, four magnets, a lens holder, a lens, a coil, a compression spring, and a rectangular top cover, wherein the base that is a rectangular frame with four stands on four corners for fastening with the top cover while an insertion hole is on center thereof to form an opening in optical pathway of lens; a plurality of positioning pins are disposed on inner surface thereof; the conductive plates are secured on the base by assembling of positioning holes and the positioning pins in insulated status and a central hole corresponding to the central hole of the base is formed between the two conductive plates; the magnets are symmetrical arched magnets, respectively arranged on inner side of the four stands of the base; the lens holder is a torus having a central hole, an inner circular flange and an outer circular flange; the lens is mounted and fixed on the central hole of the lens holder; the coil is enclosed outside the lens and is fixed on the inner circular flange of the lens holder and a head wire and a tail wire of the coil are respectively connected to different electrodes of the two conductive pieces; the spring is sleeved outside the coil, on the outer circular flange of the lens holder for elastically supporting between the outer circular flange and the top cover the top cover is disposed over and fastened with the base; thereby, the lens holder, the lens and the coil form a lens set that moves synchronously and the electromagnetic force generated by interaction between the coil and the magnets is used to drive the lens set to move while the lens set moves stably by a restoring force of the spring for focus adjustment.