Patent ID: 6984026
Filing Date: 2006-01-10
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; a plurality of discharge ports which are nozzle end openings for discharging liquid droplets; an element substrate on which a plurality of discharge energy generating elements, for generating thermal energy for discharging the liquid droplets, are provided; and a flow path composition substrate having said plurality of discharge ports and being joined to a principal surface of said element substrate, so as to form said plurality of nozzles, wherein each of said nozzles comprises: a bubbling chamber in which a bubble is generated by one of said discharge energy generating elements for discharging the liquid droplet, a discharge port portion including a respective one of said discharge ports and communicating with said discharge port and said bubbling chamber, and a supply path for supplying the liquid to the bubbling chamber, wherein each of said discharge port portions comprises: a first discharge port portion of an almost fixed diameter including said respective discharge port; and a second discharge port portion contiguous to the first discharge port portion and communicating in steps with said first discharge port portion and said bubbling chamber, respectively, and wherein a boundary portion between said second discharge port portion and said bubbling chamber and a boundary portion between said second discharge port portion and said first discharge port portion are continuously formed by a wall having a curvature.