Patent ID: 8955931
Filing Date: 2015-02-17
Classification: B41J

Abstract:
1. A liquid ejection head comprising: a substrate that carries thereon a plurality of ejection energy generating elements arranged in rows to generate energy necessary for ejecting liquid; and an ejection port plate that is laid on the substrate and has a plurality of ejection ports formed therein and arranged in rows vis-a-vis the respective ejection energy generating elements, wherein the ejection port plate has a hole which runs through the ejection port plate and surrounds the rows of the ejection ports, the hole having an inner lateral surface on a center side with respect to the ejection port plate that is corrugated throughout its height to produce a plurality of projections and recesses arranged alternately and continuously so as to produce saw-edged ridges and furrows and an outer lateral surface on a periphery side with respect to the ejection port plate that is arranged oppositely relative to the inner lateral surface such that at least regions of the outer lateral surface running along the rows of the ejection ports are formed to be flat so as not to be corrugated.