Patent ID: 8939554
Filing Date: 2015-01-27
Classification: B41J,Y10T

Abstract:
1. An ink jet print head, comprising: a substrate in which a pressure chamber is formed; a vibration film configured to define the pressure chamber and deformed to change a volume of the pressure chamber; a lower electrode formed on the vibration film; a piezoelectric film formed on the lower electrode; and an upper electrode formed on the piezoelectric film and having a periphery receding inwardly relative to a periphery of the piezoelectric film; wherein a width of the lower electrode is shorter than a width of the pressure chamber; wherein the vibration film has a rectangular shape; and wherein the piezoelectric film is longer than the vibration film with respect to a length direction of the vibration film, and an end portion of the piezoelectric film extends to an outer side of the vibration film, beyond an end portion of the vibration film in the length direction.