Liquid discharge head and method of manufacturing the same

A liquid discharge head comprising:

• a liquid discharge substrate including a discharge port for discharging liquid;
• and
• a flow path member including a flow path for supplying liquid to the liquid discharge substrate,
• wherein the flow path member includes a transparent member that is transparent to a laser beam and an absorption member that is capable of absorbing a laser beam, the transparent member including an opening through which the flow path communicates with the liquid discharge substrate,
• wherein the flow path is formed between the transparent member and the absorption member by emitting a laser beam toward a flow path portion of the absorption member constituting a portion of a wall of the flow path and toward a periphery of the flow path portion through the transparent member and thereby welding the transparent member and the absorption member to each other at the periphery of the flow path portion, and
• wherein a portion of the flow path portion directly irradiated with the laser beam that has passed through the opening includes an inclined surface inclined with respect to a direction of the laser beam.

A liquid discharge head comprising:

• a liquid discharge substrate including a discharge port for discharging liquid;
• and
• a flow path member including a transparent member that is transparent to a laser beam, an absorption member that is capable of absorbing a laser beam, and a flow path for supplying liquid to the liquid discharge substrate,
• wherein the flow path is formed between the transparent member and the absorption member by welding the transparent member and the absorption member to each other at a periphery a flow path portion of the absorption member constituting a portion of a wall of the flow path,
• wherein the flow path portion of the transparent member constituting the portion of the wall of the flow path includes a surface parallel to a weld surface at which the transparent member and the absorption member are welded to each other, and
• wherein the flow path portion of the absorption member includes an inclined surface inclined with respect to the weld surface.

A flow path member used for a liquid discharge head including a flow path for supplying liquid to a liquid discharge substrate including a discharge port for discharging liquid, the flow path member comprising:

• a transparent member that is transparent to a laser beam, the transparent member including an opening through which the flow path communicates with the liquid discharge substrate;
• and
• an absorption member that is capable of absorbing a laser beam,
• wherein the flow path is formed between the transparent member and the absorption member by emitting a laser beam toward a flow path portion of the absorption member constituting a portion of a wall of the flow path and toward a periphery of the flow path portion through the transparent member and thereby welding the transparent member and the absorption member to each other at the periphery of the flow path portion, and
• wherein a portion of the flow path portion directly irradiated with the laser beam that has passed through the opening includes an inclined surface inclined with respect to a direction of the laser beam.