Patent ID: 7936527

Claim:
An auto focus lens module with a piezoelectric actuator, comprising: a frame; a piezoelectric actuator being disposed in the frame and being used to generate vibrations; and a lens module being disposed in the frame, comprising: a lens barrel; an optical lens set disposed in the lens barrel; a tangent thrust element disposed outside the lens barrel and being used to generate a thrust in the tangent direction of the lens barrel; a metal member pressed the piezoelectric actuator by the thrust; a guiding fixture comprising a guiding slot and a guide pin, corresponding to each other and parallel to an optical axis, the guiding slot being arranged at the lens barrel, the lens barrel and the frame being slidably fixed by the guide pin so that the lens barrel moves upward and downward along the optical axis by the guide pin in the frame; and a sliding fixture comprising a slide slot and a slide rod, corresponding to each other and parallel to the optical axis, the slide slot being disposed on the lens barrel and the slide rod disposed at the slide slot so that the lens barrel move along the optical axis by the slide rod; wherein when the piezoelectric actuator is applied with a voltage, a friction force is generated on an interface between the metal member and the piezoelectric actuator, the lens barrel is driven by the friction force to move along the optical axis in the frame with the auxiliary of the guiding fixture as well as the sliding fixture for focusing.