Patent ID: 6517195
Filing Date: 2003-02-11
Classification: B41J

Abstract:
An ink jet head comprising:an ink jet head chip having: (a) a nozzle hole formed in a nozzle substrate; (b) an ejection chamber communicating with said nozzle hole; and (c) an electrostatic actuator including: (i) a diaphragm constituting at least one side wall of said ejection chamber; (ii) an individual electrode disposed so as to be opposite to said diaphragm and separated by an air gap; and (iii) a control circuit provided in said ink jet head chip to apply voltages between said diaphragm and said individual electrode to perform charging/discharging so as to transform said diaphragm so that ink drops are ejected from said nozzle hole; wherein at least a part of said control circuit is constituted by an integrated circuit integrally constructed into said nozzle substrate.