Patent ID: 8770721

Claim:
A liquid discharge head comprising: a liquid discharge substrate including a discharge port for discharging liquid; a flow path for supplying liquid to the liquid discharge substrate; an absorption member being capable of absorbing a laser beam, wherein a first flow path portion constituting a portion of a wall of the flow path is formed on a surface of the absorption member; and a transparent member being transparent to a laser beam, wherein a second flow path portion constituting another portion of the wall of the flow path is formed on a surface of the transparent member, wherein the flow path is formed by welding the surface of the absorption member and the surface of the transparent member with each other at a periphery of the first flow path portion using a laser beam emitted through the transparent member toward the first flow path portion and the periphery of the first flow path portion, and wherein the second flow path portion is constituted by a depression in a principal plane of the surface of the transparent member, and the depression includes an inclined surface inclined with respect to the principal plane of the surface of the transparent member in such a manner that the inclined surface is capable of reflecting a laser beam directed toward the first flow path portion.