Patent ID: 6773085
Filing Date: 2004-08-10
Classification: B41J

Abstract:
An ink jet recording apparatus comprising: a head chip having chambers defined in a substrate and communicating with nozzle openings at end portions in the longitudinal direction, and electrodes formed on side walls of the chambers; and driving means for applying driving voltages to the electrodes to generate driving electric fields in the side walls to change the volumes as causing ink filled inside to be ejected from the nozzle openings,wherein an ink chamber plate for defining a common ink chamber communicating with the chambers is bonded on the substrate; the common ink chamber is provided with a partitioning portion for partitioning the chambers and the common ink chamber, the partitioning portion being provided with a plurality of communicating holes for defining a pump length according to the distance from the nozzle openings, along the longitudinal direction of the chambers at an interval equivalent to the pump length; and the driving means performs driving so as to make substantially equal the driving time of a preliminary driving electric field that causes the volumes of said chambers to temporarily increase and the driving time of an ejection driving electric field that causes the volumes of the chambers to temporarily decrease subsequently to the preliminary driving electric field to cause the ink to be ejected, as the driving electric fields to be generated on the side walls.