Patent ID: 9393782
Filing Date: 2016-07-19
CPC Classification: B41J

Claim Text:
1. A liquid discharge head comprising: a substrate, on a surface of which a liquid supply port opens; and a sealing material that is in contact with a single side surface of the substrate extending in the longitudinal direction, wherein, the sealing material seals the single side surface of the substrate, wherein, the entire length of the sealing material that is in contact with the single side surface of the substrate extending in the longitudinal direction is denoted as Lc, wherein, on the surface of the substrate, an opening of the liquid supply port extends in the longitudinal direction, and the opening has a length denoted as L1, wherein, in a direction perpendicular to the longitudinal direction, the sealing material has a wide region being a widest region in the entire sealing material that is in contact with the single side surface of the substrate extending in the longitudinal direction, and a narrow region in the entire sealing material that is in contact with the single side surface of the substrate extending in the longitudinal direction, that is other than the widest region, wherein, when the width of the narrow region is denoted as W1, and the width of the wide region is denoted as W2, W1<W2, wherein, the narrow region is formed by a protruding portion that is substantially rectangular in the direction parallel to the longitudinal direction, wherein, when the total length of the narrow region is denoted as L3, and the total length of the wide region is denoted as L4×2, then L3+(L4×2)=Lc, and wherein, in a direction parallel to the longitudinal direction, L3<L1.