Patent ID: 7738210

Claim:
A position control method of inertial drive actuator which is a method of driving a moving body by inertia, with respect to a vibration substrate which is caused to make reciprocating movement by a moving means, comprising: a movement-amount setting step of setting an amount of movement per driving waveform; a target-position setting step of setting a target position of the moving body; a position detection step of detecting a relative position of the moving body with respect to the vibration substrate, based on an electrostatic capacitance of a portion at which, a first electrode provided on the moving body and a second electrode provided on the vibration plate are facing; a comparison step of comparing the target position which is set at the target-position setting step, and the relative position of the moving body with respect to the vibration substrate, which is detected at the position detection step; a drive-voltage pattern setting step of setting a drive voltage pattern which is to be applied to the moving means, the first electrode, and the second electrode, based on the amount of movement set at the movement-amount setting step and a comparison result at the comparison step; and a driving step of driving the moving body by controlling a frictional force between the vibration substrate and the moving body, by making an electrostatic force act on both, while synchronizing with a movement of the vibration substrate, by applying the drive voltage pattern which is set at the drive-voltage pattern setting step, between the first electrode and the second electrode, wherein the moving body is moved to the target position by repeating steps from the comparison step to the driving step.