Patent ID: 7817359

Claim:
A lens module comprising: a barrel defining a first through hole; two or more lenses received in the first through hole of the barrel including at least one movable lens; and at least one driving device moving the movable lens, the driving device comprising a fixed portion secured on the inner surface of the barrel and defining a trough with an opening facing the at least one movable lens; a movable portion with a first end and an opposite second end, the first end inserted into the trough and sealing a space between the first end and the bottom wall of the trough, and the second end secured to the at least one movable lens; a hydraulic fluid filling the space; and an adjustment pole inserted into the trough and threadedly engaged in a second through hole running through the barrel and a wall of the trough adjacent to the barrel, the adjustment pole being movable inwardly or outwardly in the second through hole by manual rotation thereof.