Patent ID: 6547375
Filing Date: 2003-04-15
Classification: B41J

Abstract:
An ink-jet head comprising a substrate of piezoelectric material and a plurality of groove-shaped ink chambers each having respective ends in the longitudinal direction that open respectively at front and back end surfaces of said substrate, said ink chambers being partitioned by diaphragms respectively and formed on an upper surface of said substrate, and said ink-jet head further comprising an actuator portion having an electrode formed on an inner surface of each of paired diaphragms facing each other in each ink chamber, said electrode continuing to the back end surface of said substrate,each diaphragm having a surface which forms an obtuse angle with the inner surface of the diaphragm in the ink chamber and forms an obtuse angle with a back end surface of the diaphragm, and said surface of the diaphragm being formed, in the direction of depth of said ink chamber, in a range including at least a region where said electrode is formed.