Patent ID: 8466603
Filing Date: 2013-06-18
Classification: G02B,H02N

Abstract:
1. A driving apparatus comprising: an electromechanical transducer element having first and second end faces opposed to each other in a direction of expansion and contraction thereof; a vibration friction portion attached to the second end face of the electromechanical transducer element; a movement member friction-bonded to the vibration friction portion, the movement member being movable along the direction of expansion and contraction of the electromechanical transducer element; and a vibration transmission member arranged between the second end face of the electromechanical transducer element and an end face of the vibration friction portion, wherein the vibration friction portion is pillar-shaped and has a central axis which extends in a direction parallel to the direction of expansion and contraction of the electromechanical transducer element, wherein a central axis of the electromechanical transducer element and the central axis of the vibration friction portion are not on a same line, wherein the driving apparatus is adapted to move a cylindrical driven member along a central axis of the driven member, wherein the movement member is attached to the driven member and disposed adjacent to a periphery of the driven member, wherein the vibration transmission member extends inward toward the central axis of the driven member with respect to the electromechanical transducer element, and wherein the central axis of the vibration friction portion is displaced inward from the central axis of the electromechanical transducer element.