Patent ID: 6336717
Filing Date: 2002-01-08
Classification: B41J

Abstract:
An ink jet recording head, comprising:a pressure generating chamber communicating with a nozzle opening; and a piezoelectric element comprising a lower electrode provided on an area facing the pressure generating chamber via an insulating layer, a piezoelectric layer provided on the lower electrode, and an upper electrode provided on the piezoelectric layer, wherein at least both ends of the lower electrode in a width direction thereof are positioned within the area facing the pressure generating chamber, and the piezoelectric layer covers sides of both ends of the lower electrode in the width direction thereof, wherein the end of the lower electrode is disposed at one end portion in a longitudinal direction of the pressure generating chamber, wherein an end of the upper electrode is disposed inside from the end of the lower electrode in the longitudinal direction of the pressure generating chamber, wherein the piezoelectric layer is extended to the outside of the end of the lower electrode in the longitudinal direction of the pressure generating chamber, and wherein the end of the upper electrode constitutes one end of a active part of the piezoelectric element which is a substantial driving part of the piezoelectric layer.