US Patent 10212360 Actuator and driving apparatus of camera module

An actuator of a camera module including a magnet, a driving coil facing the magnet, a driving apparatus including a driving circuit configured to apply a driving signal to the driving coil to move the magnet, and a position calculator configured to generate a feedback signal based on a current position of the magnet, wherein the driving apparatus is further configured to calculate an error value by comparing an input signal with the feedback signal, and to determine a control gain of a control signal provided to the driving circuit according to the error value, and wherein the control gain is reduced in response to an increase in the error value, and the control gain is increased in response to a decrease in the error value.