INK JET HEAD AND ITS NOZZLE HOLE FORMING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a method for conveniently obtaining an ink jet head in which a bubble can be prevented from intruding into an ink channel. SOLUTION: The ink jet head has a nozzle hole extending from the ink ejection side through a small diameter part, a protrusion at the circumferential edge of the small diameter part and a large diameter part continuous to the protrusion to an ink channel.