Voice coil driving auto-focus lens module

A voice coil driving auto-focus lens module comprising a base, two conductive plates, an insulation spacer, four permanent magnets, a lens holder, an optical lens, a spring set, a coil, and a top cover, wherein:

• the base having four stands for locking on four corners for assembling with the top cover, a central hole on center thereof that forms an opening for an optical path of the optical lens and a plurality of positioning pins arranged on inner surface thereof;
• the two conductive plates respectively being disposed on the base in insulated status by the assembling of the positioning hole with the positioning pins and a central hole corresponding to the central hole of the base is formed between the two conductive plates;
• the isolation spacer attached on the two conductive plates by assembling of positioning holes thereof with the positioning pins of the base, and disposed with a central hole;
• the permanent magnets in arched symmetrical shape and respectively disposed on inner side of the four stands of the base;
• the lens holder that is a circular body having a central hole, and an outer circular flange;
• the optical lens that is fixed in the central hole of the lens holder;
• the spring set having a coil spring and a leaf spring;
• the coil fixed on the outer circular flange of the lens holder while a head and a tail thereof are connected to different electrodes of the two conductive plates;
• a top cover covered on and locked with the base;
• wherein the lens holder, the optical lens and the coil form are assembled to form a lens set that moves synchronously;
• the coil spring is disposed around the optical lens on the outer circular flange of the lens holder and is elastically supported between the outer circular flange of the lens holder and the top cover while the leaf spring having an inner circle that is fixed on the lens holder, and an outer circle connected with and inner circle remains still;
• and
• by the resultant force of spring forces of the coil spring as well as the leaf spring, together with an electromagnetic force generated between the coil with current and the permanent magnet, the lens set moves to focus.