Patent ID: 8833910
Filing Date: 2014-09-16
Classification: B41J,C08G,H01L

Abstract:
1. A piezoelectric actuator comprising: a vibration plate; a piezoelectric layer which is stacked on the vibration plate; a plurality of individual electrodes which are arranged on one surface of the piezoelectric layer and which form individual electrode arrays arranged in two arrays in one direction; a first common electrode which is arranged on the other surface of the piezoelectric layer and which has a plurality of first facing portions each facing a part of one of the individual electrodes and a first connecting portion connecting the first facing portions; a second common electrode which is arranged on the other surface of the piezoelectric layer, which is electrically insulated from the first common electrode, which is configured so that a voltage different from a voltage applied to the first electrode is applied to the second common electrode, and which has a plurality of second facing portions each facing another part of one of the individual electrodes and a second connecting portion connecting the second facing portions; a plurality of first connecting wirings which are connected to the first common electrode, in the first connecting portion at a plurality of mutually separated positions; a plurality of first wiring sections which are arranged on the vibration plate and which are connected to the first common electrode via the first connecting wirings; a plurality of second connecting wirings which are connected to the second common electrode, in the second connecting portion at a plurality of mutually separated positions; and a plurality of second wiring sections which are arranged on the vibration plate and which are connected to the second common electrode via the second connecting wirings, wherein one of the first connecting wirings connects the first connecting portion and one of the first wiring sections while striding over the second common electrode.