Patent ID: 7574125

Claim:
A two-stage lens driving device, comprising: a lens holder for carrying a lens, the lens defining an axial direction; a guiding mechanism joined together with the lens holder, the lens holder being guided by the guiding mechanism for moving linearly along the axial direction; and an electromagnetic actuating mechanism having at least one magnetic induction member, at least a first coil member, and at least a second coil member, the magnetic induction member being mounted on the lens holder and moved with the lens holder, the first coil member and the second coil member being respectively located at a position corresponding to each of two tail ends of the magnetic induction member, the first coil member, the magnetic induction member, and the second coil member being arranged substantially along a linear direction parallel to the axial direction, a distance between the first coil member and the second coil member being greater than a length of the magnetic induction member along the linear direction; wherein applying a predetermined current to one of the first coil member and the second coil member produces a magnetic force from one of the coil members for driving the magnetic induction member to move between the first coil member and the second coil member, the first coil member and the second coil member further function to urge and position the magnetic induction member so as to achieve two-stage positioning of driving a lens.