Ink-jet recording head and ink-jet recording apparatus

Abstract

An ink-jet recording head includes a passage-forming substrate and a plurality of piezoelectric elements provided on one side of the passage-forming substrate via an vibration plate, the passage-forming substrate having a plurality of pressure generating chambers formed therein in such a manner as to communicate with corresponding nozzle orifices and as to be separated from one another by means of a plurality of compartment walls, the plurality of piezoelectric elements each including a lower electrode, a piezoelectric layer, and an upper electrode. The vibration plate undergoes tensile stress; the number n of the pressure generating chambers arranged per inch is more than 200 and is related to width w of the pressure generating chamber and thickness d of the compartment wall as represented by (w+d)=1 inch/n; and the thickness d of the compartment wall is more than 10 μm and is related to thickness h of the passage-forming substrate as represented by (d×3)≦h≦(d×6). Thus, the rigidity of the compartment walls is maintained.

Dependencies are inferred from the claim text.