Patent ID: 7576930

Claim:
A lens module comprising: a seat including a base and a guiding column extending from the base and an electromagnet mounted on the base; a first lens barrel comprising a first sleeve with a lens received therein, and a first arm extending from the first sleeve and engaging with the guiding column of the seat; and a second lens barrel located between the base and the first lens barrel, the second lens barrel comprising a second sleeve with a lens received therein, and a second arm extending from the second sleeve and movably engaging with the guiding column of the seat, the second lens barrel having a magnetic member corresponding to the electromagnet of the seat; the electromagnet being configured for applying a magnetic force to the magnetic member to drive the second lens barrel to move between the base and the first lens barrel; wherein the guiding column of the seat defines a plurality of recesses therein, the recesses are arranged between the first lens barrel and the base, and the second lens barrel is selectively engaged in any one of the recesses; the second arm of the second lens barrel connects with a positioning device elastically abutting against the column in the recesses; the positioning device comprises a spring that has an end fixed to the second arm of the second lens barrel, and a ball connecting with an opposite end of the spring, the ball abutting against the column of the seat and positioning the second lens barrel at a corresponding recess.