Patent ID: 9174439
Filing Date: 2015-11-03
Classification: B41J

Abstract:
1. A liquid ejection head comprising: a print element board including a base plate, an energy generating device configured to generate energy for ejecting liquid, an electrode pad electrically connected to the energy generating device, and a bump formed on the electrode pad; and an electric wiring board electrically connected to the bump of the print element board using an interconnecting wire, wherein the bump has a first surface, a second surface and a third surface, the third surface is opposed to the base plate, and the first surface and the second surface are provided on an opposite side of the third surface, wherein a height of the second surface from a surface of the base plate is higher than that of the first surface, wherein the first surface has a first protrusion formed therein and protruding from the bump toward the interconnecting wire, and the bump is connected to the interconnecting wire in the second surface, and wherein the height of the second surface from the surface of the base plate is higher than that of a to of the first protrusion from the surface of the base plate.