Ink jet type recording head having a flow passage substrate with a stepped configuration and recesses formed in a surface thereof

摘要

In an ink jet type recording head, a flow passage forming substrate includes pressure generating chambers which are communicated with nozzle openings respectively, a common ink chamber for supplying ink to the pressure generating chambers; and ink supply inlets through which the pressure generating chambers are communicated with the common ink chamber. Each of the ink supply inlets is so designed that it has a narrow part, and it is gradually larger from the narrow part towards the pressure generating chamber, whereby the ink supply inlet is increased in length without changing the flow resistance, and the bonding area near the ink supply inlet is increased.