Patent ID: 7578579
Filing Date: 2009-08-25
Classification: B41J

Abstract:
1. An inkjet recording head, comprising: a channel unit which has, along a reference plane, a plurality of pressure chambers communicating with a plurality of nozzles, respectively, each of which ejects a droplet of ink; and a piezoelectric actuator which changes a volume of an arbitrary one of the pressure chambers so that a corresponding one of the nozzles ejects the droplet of ink, wherein the piezoelectric actuator includes a plurality of individual electrodes corresponding to the plurality of pressure chambers, respectively, a common electrode which is opposed to each of the individual electrodes in a direction perpendicular to the reference plane, a piezoelectric layer which is interposed between the common electrode and each of the individual electrodes, and a plurality of electric wires which are connected to the plurality of individual electrodes, respectively, so as to supply respective drive voltages to the individual electrodes, and wherein a portion of at least one of the electric wires that is connected to at least one first individual electrode of the individual electrodes that corresponds to at least one first pressure chamber of the pressure chambers overlaps, as seen in the direction perpendicular to the reference plane, (a) a portion of at least one second pressure chamber of the pressure chambers that differs from said at least one first pressure chamber and (b) at least one first portion of the piezoelectric layer that overlaps said portion of said at least one second pressure chamber; and wherein said at least one first portion of the piezoelectric layer does not directly contact the common electrode.