Patent ID: 6234607
Filing Date: 2001-05-22
Classification: B41J

Abstract:
An ink jet head, comprising:an ink nozzle for ejecting ink drops;an ink chamber having at least one wall and a volume and extending into communication with said ink nozzle for storing ink;an elastic diaphragm formed in said at least one wall of said ink chamber;a diaphragm drive circuit connected to said diaphragm to selectively deform said diaphragm and alter the volume of said ink chamber;a substantially stationary wall disposed externally to said ink chamber opposing said diaphragm and a gap separating said stationary wall from said diaphragm when said diaphragm is not deformed;a signal generator in communication with said diaphragm drive circuit for applying a charge signal and a first discharge signal to said diaphragm drive circuit to eject an ink drop from said nozzle;a timer in communication with said signal generator for timing a predetermined interval after application of said charge signal; and whereinsaid signal generator applies a subsequent charge signal after said predetermined interval to displace said diaphragm to contact said stationary wall to reduce residual vibration in said diaphragm after application of said charge signal.