Patent ID: 9283755
Filing Date: 2016-03-15
CPC Classification: B41J

Claim Text:
1. A liquid ejection head comprising: a plurality of discharge orifices arrayed in a predetermined direction; energy generation devices disposed in correspondence with the discharge orifices and configured to generate thermal energy for use in ejecting liquid; pressure chambers partitioned by walls, the pressure chambers each accommodating the energy generation device and communicating with the discharge orifice; and channels configured to supply liquid to the pressure chambers; wherein the edge of the discharge orifice has at least one protrusion protruding toward a central portion of each of the discharge orifices, and the discharge orifices have an elongated shape in which a length in a direction in which the liquid flows from the channel to the pressure chamber is larger than a width in a direction perpendicular to the liquid flowing direction, wherein a curvature of a first portion of the edge where the direction in which liquid flows from the channel to the pressure chamber and a tangent to the first portion are parallel to each other is smaller than a curvature of a second portion of the edge next to the protrusion, the second portion being except a portion where the protrusion is provided.