Patent ID: 7420321
Filing Date: 2008-09-02
Classification: H01L,H02N

Abstract:
1. Electromechanical actuator, comprising: a back portion; at least two separate actuating portions of electromechanically active material, having a generally elongated shape; said electromechanically active material as such presenting a shape change when an electrical field being applied over said electromechanically active material; said at least two actuating portions being attached by a first end to a first side of said back portion, positioned parallel to each other one after the other in a first direction, forming a single common piece; said first direction being transverse to said generally elongated shape; internal electrode layers arranged inside said electromechanically active material for applying of said electrical field over said electromechanically active material for activating said electromechanically active material in a bimorph structure; said bimorph structure enabling a second end of said actuating portions, opposite of said first end, to move along said first direction as well as along the elongated extension of said actuating portions; said internal electrode layers having a generally flat two-dimensional shape directed substantially perpendicular to said first direction; and means for transporting by heat conduction, heat generated within said electromechanically active material during said shape changes to an outer surface of said back portion; said means for transporting comprising said internal electrode layers extending continuously over a major part of said actuating portion and into the back portion, thereby creating continuous heat paths through the actuating portion and back portion.