Patent ID: 6942322

Claim:
A drop-on-demand ink-jet printing head comprising: a nozzle plate having an array of a plurality of nozzle apertures; an array of a plurality of piezoelectric elements arranged at regular intervals and fixed at one end thereof to a base, other ends of said piezoelectric elements, respectively, being free ends which are in opposition to respective ones of said nozzle apertures; ink reservoir portions disposed between said nozzle apertures and said free ends, wherein said piezoelectric elements are formed by cutting into divided pieces, at predetermined widths, a piezoelectric plate obtained by a lamination of at least two layers of piezoelectric material and at least two layers of conductive material stacked alternately in layers; and a vibration plate being driven by said piezoelectric element array and interposed between said nozzle plate and said piezoelectric element array, wherein ink droplets are ejected in a same direction as a main vibration direction of said vibration plate.