Patent ID: 8072691
Filing Date: 2011-12-06
Classification: G02B

Abstract:
1. A lens module, comprising: an accommodating member having a cylinder, the cylinder having a plurality of stepwise slits each having an end exposed at an underside surface thereof; a lens barrel having a plurality of restricting elements extending from an outer surface thereof, the lens barrel being coaxially accommodated in the cylinder with each of the restricting element passing through a corresponding one of the slits; a holder for fixing the accommodating member, and comprising a stepped through hole, a fixing surface exposed in the stepped through hole, and a plurality of protrusions around the stepped through hole, each of the protrusions being inserted in one of the slits at the end thereof, and each of the restricting elements being movable in and along the corresponding one of the slits; and a resilient member sandwiched between the lens barrel and the holder with an end of the resilient member fixed on the fixing surface, the resilient member being capable of changing the length thereof under an external force and recovering the original length with the external force withdrawn, such that a focal length of the lens module is adjustable by moving the restricting elements in and along the slits.