Apparatus and method of driving piezoelectric actuator for auto-focus

[0021]The invention may however be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the shapes and dimensions may be exaggerated for clarity, and the same reference numerals will be used throughout to designate the same or like components.

[0022]FIG. 2 is a block diagram illustrating an apparatus for driving a piezoelectric actuator according to an exemplary embodiment of the present invention.

[0023]Referring to FIG. 2, an apparatus for driving a piezoelectric actuator according to an exemplary embodiment of the invention may include a lens position sensing unit 21, a lens control unit 22, and an actuator driving unit 23. The embodiment of the invention can be applied to a camera module that includes a lens 20 that varies in position to achie