Patent ID: 6361154
Filing Date: 2002-03-26
Classification: B41J

Abstract:
An ink-jet head comprising:a head body including plural pressure chamber concaves each having a supply port for supplying ink and a discharge port for discharging ink; and a piezoelectric actuator including: mutually electrically connected vibration plates that cover said concaves of said head body in order to form pressure chambers together with said concaves and are separately provided correspondingly to one or plural pressure chambers; piezoelectric device respectively provided on surfaces of said vibration plates opposite to said pressure chambers correspondingly to said pressure chambers; and individual electrodes respectively provided on surfaces of said piezoelectric devices opposite to said vibration plates for applying a voltage to said piezoelectric devices together with said vibration plates, wherein said vibration plates are deformed in a manner that volumes of said pressure chambers are decreased by applying a voltage to said piezoelectric devices through said vibration plates and said individual electrodes, whereby ink contained in said pressure chambers is discharged through said discharge ports, and wherein a portion of each of said vibration plates corresponding to each of said pressure chambers is bent into a non-flat shape due to the internal stress action of each of said piezoelectric devices.