Patent ID: 6988786
Filing Date: 2006-01-24
Classification: B41J

Abstract:
1. An ink jet recording head comprising: a substrate having heat generating members provided on a surface thereof to generate bubbles in ink; a ceiling wall facing said substrate, having plural discharge ports formed therefor to discharge ink; plural partition walls for forming plural ink flow paths communicating with said discharge ports, respectively, for supplying ink to said discharge ports; and a flow path formation member provided on the surface of said substrate, ink being discharged from said discharge ports by pressure exerted by the generation of the bubbles, wherein for each of said ink flow paths a plurality of said heat generating members, including two rectangular heat generating members electrically connected in series, is provided therein, and said discharge port is arranged on an extended line extending in a normal direction from a center of a pressure-generating area structured by said plurality of heat generating members, a non-bubbling area is provided to be positioned between said plurality of said heat generating members, and said non-bubbling area is provided within a projected area on the surface of said substrate having said discharge port projected thereon, a bubble caused by boiling ink by said heat generating members communicates with the outside for the first time during the stage in which the volume of the bubble is reduced after the volume of the bubble has grown to a maximum value, and portions of said two rectangular heat generating members overlap with the projected area of the discharge port projected on the surface of the substrate.