Patent ID: 7737606

Claim:
An inertial drive actuator comprising: a fixed member; a vibration substrate provided on the fixed member; movement unit that causes the vibration substrate to reciprocate relative to the fixed member; a first moving body and a second moving body provided on the vibration substrate that move with reciprocating movement of the vibration substrate by inertia relative to the vibration substrate; a first electrode provided on a surface of each of the first and second moving bodies that faces the vibration substrate; a second electrode provided on a surface of the vibration substrate that faces the first and second moving bodies; an insulating film provided between the first electrode and the second electrode; a drive unit that applies a voltage to cause the movement unit to reciprocate and applies a voltage to cause an electrostatic force to act between the first electrode and the second electrode thereby controlling a frictional force acting between the vibration substrate and the first and second moving bodies; and a position detection unit that detects the position of the moving body with respect to the vibration substrate based on the capacitance of a portion in which the first electrode and the second electrode are opposed to each other.