Patent ID: 8576495

Claim:
A zoom lens comprising: a first lens unit comprising a first lens group, a second lens unit comprising a second lens group, a third lens unit comprising a third lens group and a fourth lens unit comprising a fourth lens group; wherein the first lens unit, second lens unit, third lens unit and fourth lens unit are arranged in an order from an object side to an image side of the zoom lens and align with each other along an optical axis of the zoom lens, the first lens unit, second lens unit and third lens unit move along the optical axis to zoom in or zoom out, the third lens unit comprises a movable barrel movable along the optical axis, a first slidable member slidably connected to the movable barrel along a first direction substantially perpendicular to the optical axis and a second slidable member slidably connected to the first slidable member along a second direction substantially perpendicular to the optical axis and the first direction, the third lens group is fixedly held by the second slidable member, the movable barrel comprises a first Hall member and a first coil fixed thereon, the first slidable member comprises a second Hall member, a second coil and a first magnetic fixed thereon, the first magnet is aligned with the first coil and the first Hall member along the optical axis, the second slidable member comprises a second magnet, the second magnet is aligned with the second coil and the second Hall member along the optical axis, the first Hall member is configured for detecting a deviation of the first slidable member along the first direction, the second Hall member is configured for detecting a deviation of the second slidable member along the second direction, the first coil is configured for driving the first slidable member to move along the first direction for compensating the deviation of the first slidable member, and the second coil is configured for driving the second slidable member to along the second direction for compensating the deviation of the second slidable member.