Patent ID: 6168263
Filing Date: 2001-01-02
Classification: B41J

Abstract:
An ink jet recording apparatus for printing to a recording medium by ejecting ink droplets from a nozzle, comprising: a diaphragm for applying pressure to the nozzle for injecting an ink droplet; a capacitor formed by the diaphragm and an electrode opposing the diaphragm with a specific gap therebetween; a drive circuit for charging and discharging the capacitor to deform the diaphragm by means of an electrostatic force and thereby eject an ink droplet from the nozzle; a vibration chamber defined in part by a first wall surface formed by the diaphragm and a second wall surface on which the electrode is disposed, the vibration chamber being sealed airtight; and a cavity communicating with the vibration chamber, which increase a volume of an airtight sealed part including said vibration chamber.