Patent ID: 10189253

Abstract:
A liquid ejection head includes a substrate; and an ejection orifice-forming member formed on the substrate and including an ejection orifice configured to eject liquid and a liquid channel communicating with the ejection orifice. The ejection orifice-forming member includes an ejection orifice-forming member layer A, an intermediate water-repellent layer, and an ejection orifice-forming member layer B in this order from a substrate-side of the member. The ejection orifice-forming member also includes a protrusion protruding into the ejection orifice, and the ejection orifice-forming member includes a water-repellent projection portion that is at least a portion of the intermediate water-repellent layer and that projects farther into the ejection orifice than the ejection orifice-forming member layer A and the ejection orifice-forming member layer B.