FOCAL LENGTH CONTROL MODULE FOR LENS

摘要

PURPOSE: A focal distance adjustment module of a lens in which durability is improved is provided to control the focal distance adjustment between the lens and the lens using a zoom function. CONSTITUTION: A focal distance adjustment module of a lens in which durability comprises a stator(10), a movable element(20) and an actuator member(30). The accommodation space(12) is formed in stator. The movable element is accepted to the accommodation space of the stator. The actuator member comprises a permanent magnet, a coil(32) and a stopper(33). The permanent magnet is arranged in the inner wall of stator and generates permanent magnetic force. The coil is arranged in the exterior wall of the movable element and generates the electromagnetic force. The stopper is the magnetic material.