Patent ID: 8207746
Filing Date: 2012-06-26
Classification: G01D,H02N

Abstract:
1. A calibration method for inertial drive actuator of driving a target moving body among a plurality of moving bodies to move by inertia between a first movement limit position and a second movement limit position in relation to an oscillating plate that is moved to reciprocate by a moving member, and detecting positions of the moving bodies based on electrostatic capacitances, the calibration method comprising steps of: detecting in which, electrostatic capacitances of opposing parts of a moving body side electrode provided in a target moving body and an oscillating plate electrode provided in the oscillating plate is detected at the first movement limit position and the second movement limit position, respectively; storing in which, the electrostatic capacitances at the first movement limit position and the second movement limit position detected at the detecting step are stored; and calculating in which, a ratio of a difference between the electrostatic capacitances at the first movement limit position and the second movement limit position stored at the storing step to a movement limit distance that is a distance between the first movement limit position and the second movement limit position is calculated, wherein it is made possible to calculate an absolute position of the target moving body between the first movement limit position and the second movement limit position by using the ratio calculated at the calculating step, and at least one of the first movement limit position and the second movement limit position is a position where the target moving body abuts against a non-target moving body.