LAMINATED PIEZOELECTRIC ACTUATOR ELEMENT, AND LAMINATED PIEZOELECTRIC ACTUATOR

摘要

PROBLEM TO BE SOLVED: To provide a laminated piezoelectric actuator element that can relax stress applied to a laminated body during driving, suppress damage in an external electrode, a solder layer, etc. and improve durability than heretofore, and to provide a laminated piezoelectric actuator.;SOLUTION: A plurality of slits 6 are formed on side faces on both sides of a laminated body 5 with specified spacing in vertical direction (parallel to the laminated face) to the lamination direction as in cutting made from the side face at specified depth, so as to relax stress in the laminated body. External electrodes 7 and 8 are formed on side faces (where the slits are formed) on both sides of the laminated body 5 in a manner that they do not overlap the slits 6 when the laminated body 5 is projected from the surface side where the external electrodes 7 and 8 are formed. Solder layers 9 and 10 are formed entirely over the surface of the external electrodes 7 and 8, and they are not coupled with each other on the slits 6.;COPYRIGHT: (C)2009,JPO&INPIT