Patent ID: 7934795
Filing Date: 2011-05-03
Classification: B41J

Abstract:
1. A liquid ejection head comprising: a substrate comprising a liquid supply port for supplying liquid and a plurality of ejection energy generating elements, disposed along the liquid supply port, for generating energy for ejecting liquid droplets; and an ejection outlet plate comprising a plurality of ejection outlets, provided correspondingly to the plurality of ejection energy generating elements, for ejecting the liquid and comprising a plurality of liquid flow passages, provided correspondingly to the plurality of ejection outlets, for establishing communication between the ejection outlets and the liquid supply port, wherein said ejection outlet plate is provided with a hole portion formed so as to surround the liquid flow passages, said hole portion comprising a plurality of first holes which are arranged in a line and which have opening edges having a shape without an acute angle, and said hole portion further comprising a plurality of second holes having opening edges formed in a substantially sawtooth shape, with respect to a direction perpendicular to a surface of said ejection outlet plate.