Patent ID: 8919931
Filing Date: 2014-12-30
Classification: B41J

Abstract:
1. An ink jet head comprising: a plurality of nozzles forming a predetermined array; a plurality of liquid chambers respectively provided for the nozzles; a plurality of pressure generation elements respectively provided for the liquid chambers, which pressure generation elements respectively discharge liquid in the liquid chambers as a droplet from the nozzles; a plurality of individual supply flow paths which respectively supply the liquid to the liquid chambers; a common supply flow path that is connected to each individual supply flow path and supplies the liquid into each individual supply flow path; and a liquid supply unit that circulates the liquid of the common supply flow path so as to make the liquid flow in one direction in the common supply flow path, wherein the common supply flow path has a shape in which a cross-sectional area is increased and decreased at a predetermined interval and at a constant size by narrowing or widening a flow path width of the common supply flow path along an extending direction of the common supply flow path, and wherein each individual supply flow path is provided at a position where the cross-sectional area of the common supply flow path is at a largest.