Patent ID: 8652767

Claim:
A process for producing a liquid ejection head including an ejection orifice member having a plurality of ejection orifices for ejecting liquid provided along an arrangement direction, the process comprising: preparing a substrate provided with a resin layer which contains a photocurable resin; carrying out a first exposure treatment and a second exposure treatment, which are each an exposure treatment of subjecting the resin layer to exposure; and forming the ejection orifices of the resin layer subjected to the first exposure treatment and the second exposure treatment, wherein an inclination angle of a side wall of the ejection orifices formed by the first exposure treatment with respect to the substrate differs from an inclination angle of a side wall of the ejection orifices formed by the second exposure treatment with respect to the substrate, wherein the ejection orifices have a side wall along a direction orthogonal to the arrangement direction, wherein the first exposure treatment is a treatment of subjecting a portion of the resin layer corresponding to the side wall along an orthogonal direction to exposure so that a ratio b/a is equal to or larger than one, where ‘a’ represents a width in the arrangement direction of a front side opening of the ejection orifices and ‘b’ represents a width in the arrangement direction of a back side opening of the ejection orifices, wherein the second exposure treatment is a treatment of subjecting a portion of the resin layer corresponding to side walls other than the side wall along the orthogonal direction to exposure so that a ratio d/c is larger than one, where ‘c’ represents a width in the orthogonal direction of the front side opening of the ejection orifices and d represents a width in the orthogonal direction of the back side opening of the ejection orifices, and wherein the ratio d/c is larger than the ratio b/a.