Patent ID: 6429572
Filing Date: 2002-08-06
Classification: H01H,H02N

Abstract:
An actuation device comprising at least one piezoelectric motor and a movable part, in which the said piezoelectric motor is formed by at least one piezoelectric element associated with means for supplying electric current making it possible to cause oscillatory deformations of the said piezoelectric element, characterised in that the movable part comprises at least one micro-rack intended to allow the transmission to the movable part of the driving force generated by the oscillatory deformations of the piezoelectric element and the deformation of the piezoelectric element is a deformation essentially by elongation; wherein the micro-rack has a surface on which, in a part of the deformation cycle, a rod exerts a force allowing the movement of the movable part and a second surface along which, over a second part of the deformation cycle, the rod exerts substantially no force on the movable part.