Patent ID: 8253306

Claim:
An inertial drive actuator comprising: a fixed member; a displacement generating mechanism of which, one end is adjacent to the fixed member, and a displacement is generated at the other end thereof; a driving mechanism which applies a voltage for displacing the displacement generating mechanism; a vibration substrate which is connected to the other end of the displacement generating mechanism, and which is displaceable in a direction of displacement; a mobile object which is disposed to be facing the vibration substrate, and which moves with respect to the vibration substrate by inertia; and a friction controlling mechanism which changes a frictional force between the mobile object and the vibration substrate; a regulating member which regulates the movement of the mobile object is provided to at least one of the fixed member and the vibration substrate; and a closed area formed on the regulating member and extending in an a direction other than a direction of displacement of the vibration substrate, wherein the mobile object is arranged within the closed area, and the mobile object moves along the regulating member.