AF Method for fast Auto Focus control of lens and device for the same

摘要

Discloses a lens AF drive control method for changing a drive current input to a drive element for driving the lens so as to change a position of the lens from an initial position to a target position. During the 'driving current control period' between the control start point where the change of the drive current starts and the control end point when the change of the drive current ends, the drive current is changed to the target drive current level corresponding to the target position, The driving current is increased and decreased one or more times, respectively, so that the plurality of current levels existing between the initial driving current levels corresponding to the current driving currents are each maintained at least once. At this time, the level transition edge of the driving current has a multi-step waveform consisting of a plurality of steps.