Patent ID: 7737610
Filing Date: 2010-06-15
Classification: H01L,H02N

Abstract:
1. A drive apparatus, comprising: a movable member; an electromechanical transducer which is secured to the movable member at a first end thereof; a drive friction member which is connected on a second end of the electromechanical transducer and is supported by the movable member movably in an expansion-contraction direction of the electromechanical transducer; a pair of plate springs which extend to form two walls of a channel-like shape in the expansion-contraction direction of the electromechanical transducer, the walls of the plate springs slidably sandwiching the drive friction member with pressure to permit the movable member to move in the expansion-contraction direction of the electromechanical transducer; a base member which holds the plate springs in a cantilever manner in a direction of shorter sides of the plate springs and auxiliary springs, which are each arranged outside the plate springs and apply elastic force to the walls of the plate springs such that the applied elastic force is larger at end portions of the plate springs than at central portions of the plate springs so that the pressure applied by the plate springs against the drive friction member remains constant as the moveable member moves between opposite end portions of the plate springs, wherein the movable member is movable in the expansion-contraction direction.