Patent ID: 7100282

Claim:
A method of manufacturing a piezoelectric vibration element unit used for an inkjet recording head, comprising the steps of: alternately laminating conductive layers and piezoelectric material layers so that each of said conductive layers is located inside of a cut line along which a dummy piezoelectric element is to be cut out, each of the piezoelectric material layers having a predetermined size and a predetermined thickness; sintering a laminated structure after the conductive layers and the piezoelectric layers are laminated to a predetermined thickness; forming external connection electrodes on surfaces of a sintered structure; and fixing a non-vibration region of the sintered structure onto a fixing plate, and cutting a region of the structure where the conductive layers are formed therein into drive piezoelectric vibration elements, and cutting a region of the structure where the conductive layers are not formed into the dummy piezoelectric element and wherein a region, which includes a side surface of the dummy piezoelectric element and extends inwardly into the dummy piezoelectric element does not include the conductive layers.