Camera module and calibration method thereof

A calibration method for a camera module, the camera module comprising a substrate, a sensing chip, a lens module and a piezoelectric plate, the sensing chip being electrically connected with the substrate, the sensing chip being covered by the lens module and arranged between the substrate and the lens module, the lens module comprising a lens holder and a lens group supported on the lens holder, the piezoelectric plate being arranged between the substrate and the lens module, and beneath the lens holder and separated from the lens group, the calibration method comprising steps of:

• if a spacing distance between the lens group and the sensing chip does not match a focal length of the lens group, acquiring a value of an electric power for driving the deformation of the piezoelectric plate to have the spacing distance between the lens group and the sensing chip match the focal length of the lens group;
• storing the value of the electric power;
• and
• providing the value of the electric power to the piezoelectric plate when the camera module is enabled to perform an image capturing operation;
• wherein the piezoelectric plate is in contact with the sensing chip.