LIQUID JET HEAD

摘要

A liquid ejection head includes a liquid path; an ejection outlet forming member which constitutes a part of a wall of the liquid and which forms an ejection outlet for ejecting a droplet of liquid; a heat generating element, provided at a position opposing to the ejection outlet of the wall of the liquid flow path, for generating a bubble in the liquid by application of heat to the liquid; a restrictor portion, provided at a recessed portion of the ejection outlet, wherein the recessed portion is recessed from a plane in which the ejection outlet is formed, wherein the liquid forms a meniscus and is retained in the ejection outlet such that the restrictor portion is within the liquid, wherein an area So of an opening of the restrictor portion and a surface Sh of the heat generating element satisfy So