Patent ID: 6719409
Filing Date: 2004-04-13
Classification: B41J

Abstract:
An ink jet printer head, comprising:a pressure chamber, which is formed in a substrate as a cavity and provides an opening part having a designated contour shape on the upper surface side of said substrate; a vibration transferring plate, which is bonded to said pressure chamber in a state that said vibration transferring plate covers said opening part; and a piezoelectric actuator, which is formed by layering a lower electrode, a piezoelectric plate, and an upper electrode on said vibration transferring plate, wherein: said designated contour shape of said opening part of said pressure chamber is a rectangle, and the length ratio of the short side to the long side of said rectangle is 0.8 or more and 1.0 or less, and the contour of said piezoelectric plate of said piezoelectric actuator is positioned within said contour shape of said opening part of said pressure chamber above said opening part.