Patent ID: 9096063
Filing Date: 2015-08-04
Classification: B41J

Abstract:
1. A method of manufacturing a liquid ejection head comprising a substrate including, in a first surface thereof, a plurality of ejection energy generation elements configured to generate energy for ejecting a liquid, and an orifice plate disposed on a first surface side of the substrate to form ejection orifice through which the liquid is ejected, and to define liquid flow passages communicating with the ejection orifices, the substrate including a recess-shaped common supply port formed in a second surface thereof on an opposite side to the first surface, and a plurality of independent supply ports penetrating from a bottom surface of the common supply port to the first surface and communicating with the liquid flow passages, the ejection orifices being disposed above the ejection energy generation elements, two of the independent supply ports being disposed adjacent to each of the ejection energy generation elements for supply of the liquid to the relevant ejection energy generation element with the relevant ejection energy generation element disposed between the two independent supply ports, the method comprising the steps of: (1) forming a recess in the second surface of the substrate to form the common supply port, (2) forming an etching mask having opening patterns which specify opening positions of the independent supply ports, on the bottom surface of the common supply port, and (3) performing ion etching using plasma with the etching mask employed as a mask, thereby forming the independent supply ports, wherein the etching mask has a portion where a pitch of the opening patterns is narrowed toward an edge of the bottom surface of the common supply port from a center of the bottom surface of the common supply port.