Multi-Layer Piezoelectric Element, Ejection Apparatus Using the Same and Fuel Ejection System

Abstract

To provide a multi-layer piezoelectric element which is easy to be fabricated and which exhibits excellent durability, even when it is driven continuously for a long time under high electric field and high pressure. The multi-layer piezoelectric element comprising a stacked body wherein a plurality of piezoelectric layers and a plurality of metal layers are stacked alternately one on another and it is driven by applying a voltage to adjacent and opposing metal layers, wherein an average grain size of the piezoelectric crystal grains in a side face of the stacked body is larger than an average grain size of the piezoelectric crystal grains in the piezoelectric layer which is sandwiched between the adjacent and opposing metal layers.

1 - 13 . (canceled) 
     
     
         14 . A method for manufacturing a multi-layer piezoelectric element comprising:
 cutting a stacked body wherein a conductive paste layer and a ceramic green sheet comprising piezoelectric ceramic powder are stacked alternately one on another,   adhering shavings of the conductive paste layer to, the surface of the ceramic green sheet exposed to the cut surface, and   firing the cut stacked body at a predetermined temperature.   
     
     
         15 . A method for manufacturing a multi-layer piezoelectric element comprising:
 cutting a stacked body wherein a conductive paste layer and a ceramic green sheet comprising piezoelectric ceramic powder are stacked alternately one on another by a blade in a form of a saw blade, and   firing the cut stacked body at a predetermined temperature.