Patent ID: 8040623

Claim:
A compact auto focus lens module having a piezoelectric actuator, comprising: a frame; a piezoelectric actuator disposed in the frame for generating vibrations; and a lens module disposed in the frame, comprising: a lens barrel; an optical lens set disposed in the lens barrel; an elastic element arranged between the lens barrel and the piezoelectric actuator, comprising an elastic member and a metal member, wherein the elastic member is fixed to and arranged between the metal member and the lens barrel to press the metal member to the piezoelectric actuator so that the piezoelectric actuator contacts the metal member; and two guiding fixtures configured to slidably fix the lens barrel to the frame so that the lens module moves vertically along an optical axis in the frame; wherein, while applying voltage to the piezoelectric actuator to generate the vibrations, the lens barrel is driven by the friction between the piezoelectric actuator and the metal member, and moves along the optical axis.