Method for controlling optical element driving mechanism

A method for controlling an optical element driving mechanism, comprising:

• driving a movable portion moving relative to a fixed portion by a driving assembly, wherein the driving assembly comprises a first driving portion disposed on one side of the fixed portion and the movable portion, the first driving portion comprises a first magnetic permeable element, a first coil, and a first magnetic element, wherein the first coil surrounds the first magnetic permeable element, the first magnetic element is disposed between two extending portions of the first magnetic permeable element;
• outputting, by a driver integrated circuit (IC) electrically connected to the driving assembly, a first control signal to the first driving portion based on a sensing signal, wherein the first control signal is periodic and comprises a first front signal, a first middle signal, and a first rear signal in a period, at least one of trends or durations of the first front signal, the first middle signal, and the first rear signal are different, and average intensities of the first front signal and the first rear signal are different;
• outputting a second control signal to a second driving portion of the driving assembly by the driver IC, the second control signal is periodic and comprises a second front signal, a second middle signal, and a second rear signal in a period, wherein a total duration of the first front signal and the first middle signal is different from a total duration of the second front signal and the second middle signal;
• and
• limiting the movable portion to move relative to the fixed portion in a limited range by a stopping protrusion extending from a surface of the fixed portion, and the surface faces the movable portion;
• wherein the movable portion is used for connecting an optical element, and the movable portion is movable relative to the fixed portion.