Patent ID: 8282192

Claim:
A method of producing a head chip unit, comprising: a head chip forming step of forming each of a plurality of head chips having a substantially plate-shaped main body comprised of a first substrate and a second substrate by forming in the first substrate at least one channel that extends generally along a first direction from one edge side to another edge side of the main body and that has an opening at the another edge side, forming in the second substrate at least one ink chamber having a supply part and extending generally along a second direction substantially orthogonal to the first direction and communicating with the at least one channel on the one edge side of the main body, and forming at least one ink supply hole that penetrates the main body and communicates with the supply part of the at least one ink chamber; and a lamination step of laminating the plurality of head chips relative one another in a plurality of layers along a laminating direction so that the supply part of at least one of the head chips does not overlap the at least one channel and the at least one ink chamber in the laminated direction of another of the head chips laminated on a surface of the at least one head chip; wherein the at least one ink supply hole of the another head chip is formed so that it does not overlap the ink chamber of the another head chip in the laminating direction.