Patent ID: 7446964

Claim:
A lens module, comprising: a hollow holder having an inner thread in an inner wall thereof; a ring-shaped first support having an outer thread, the first support being threadedly engaged with a first portion of the inner wall of the holder, the first support having a first end and an opposite second end; a ring-shaped second support having an outer thread, the second support being threadedly engaged with a second portion of the inner wall of the holder, the second support having a first end and an opposite second end, the first end of the second support facing toward the second end of the first support; at least one lens; a lens barrel receiving the at least one lens therein, the lens barrel being movable between the first support and the second support, the lens barrel having a first end and an opposite second end, the second end of the lens barrel facing toward the second support; a first magnetic field generator for generating a first magnetic field at a region between the first support and the second support, the first magnetic field generator being attached to the second end of the lens barrel; a second magnetic field generator for generating a second magnetic field at the region between the first support and the second support, the second magnetic generator being disposed on the second end of the second support; and a control circuit for controlling at least one of the first and second magnetic field generator in a manner such that a direction of the first magnetic field is essentially the same as a direction of the second magnetic field, whereby the first magnetic field generator together with the lens barrel is moved adjacent to the first support, or a direction of the first magnetic field is essentially opposite to the direction of the second magnetic field, whereby the first magnetic field generator together with the lens barrel is moved adjacent to the second support.