Patent ID: 7090334
Filing Date: 2006-08-15
Classification: B41J

Abstract:
1. An ink jet record head comprising: a plurality of nozzles through which liquid flows; a supply chamber for supplying the liquid to each of the nozzles; and a plurality of discharge ports, which are end openings of the nozzles, respectively, for discharging liquid droplets; an element substrate on which are provided, in correspondence to said nozzles, discharge energy generating elements for generating thermal energy for discharging the liquid droplets; and a flow path composition substrate joined to a principal surface of said element substrate, wherein each nozzle includes a bubbling chamber in which a bubble is generated by the corresponding discharge energy generating element, a discharge port portion including the respective one of said discharge ports and communicating between said respective discharge port and said bubbling chamber, and a supply path for supplying the ink to said bubbling chamber, wherein said discharge port portion has a first discharge port portion of an almost fixed diameter including said discharge port, and a second discharge port portion contiguous to said first discharge port portion and communicating in steps with said first discharge port portion and said bubbling chamber respectively, wherein said second discharge port portion has a first boundary portion between said second discharge port portion and said bubbling chamber, and a second boundary portion between said second discharge port portion and said first discharge port portion, and wherein said first boundary portion and said second boundary portion are continuously formed by a wall having a curvature.