Patent ID: 8290731

Claim:
A calibration method for an inertial drive actuator wherein a moving body is driven 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 wherein a position of the moving body is detected based on an electrostatic capacitance, the calibration method comprising steps of: detecting at the first movement limit position with a detecting circuit and at the second movement limit position with the detecting circuit electrostatic capacitances of opposing parts of a moving body side electrode provided in the moving body and an oscillating plate electrode provided in the oscillating plate; storing with a storage unit, the electrostatic capacitances at the first movement limit position and the second movement limit position detected at the detecting step with the detecting circuit; and calculating with a ratio calculating unit, 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 with the storage unit to a movement limit distance that is a distance between the first movement limit position and the second movement limit position; wherein an absolute position of the moving body between the first movement limit position and the second movement limit position can be determined by using the ratio calculated at the calculating step with the ratio calculating unit.