Patent ID: 8091233

Claim:
A method of manufacturing a liquid discharge head including a plurality of passages on a substrate, the passages communicating with a plurality of discharge ports configured to discharge liquid, the method comprising: forming first, second, third, and fourth members, the first member having a shape of one passage, the second member having a shape of another passage, the third member being formed near the first member, the fourth member being formed near the second member, the first to fourth members being formed on a surface of the substrate such that longitudinal directions of the first to fourth members are arranged substantially in parallel to each other, and that a length of a part of the third member differs from a length of a part of the fourth member in a direction substantially orthogonal to the longitudinal directions thereof; coating the substrate with a cover layer covering the first to fourth members; and removing the first member to form the one passage, and removing the second member form the another passage.