Tintenstrahl-Druckkopf und sein Herstellungsverfahren

摘要

An ink ejection device for ejecting ink comprises: a piezoelectric ceramic plate for defining an ink channel for containing ink, the piezoelectric ceramic plate deforming by application of an electric voltage thereto so as to change the volume in the ink channel and eject ink from the ink channel, the piezoelectric ceramic plate being formed by injection molding so that the piezoelectric ceramic plate having one surface with a surface roughness Rz (defined in Japanese Industrial Standard "JIS B 0601") of 1 mu m or less; and a metal electrode provided on the surface of the piezoelectric ceramic plate for applying the electric voltage to the piezoelectric ceramic plate.