Patent ID: 6341850
Filing Date: 2002-01-29
Classification: B41J

Abstract:
An ink jet recording head, comprising:plural ink chambers included inside a substrate and respectively partitioned by side walls; a diaphragm which is formed on a surface of said substrate, wherein said diaphragm seals one side of said ink chambers and at least an upper surface of said diaphragm acts as a lower electrode; and a piezoelectric active part provided with a piezoelectric film arranged on said diaphragm corresponding to said ink chamber and an upper electrode formed on said piezoelectric film wherein: said diaphragm is constituted as a laminated film provided with at least two layers of a layer with positive stress and a layer with negative stress; a tension of said diaphragm is one of: substantially zero; and negative; and a sum of a tension of said piezoelectric film and the tension of said diaphragm is positive.