Liquid discharge head and head unit using the same

A liquid discharge head comprising:

• a first and a second discharge port array in which a plurality of discharge ports are arranged along a first direction, the first and second discharge port arrays being arranged parallel to each other in a second direction intersecting the first direction;
• pressure chambers communicating with discharge ports included in the first and second discharge port arrays and extending along the second direction;
• a common liquid supply flow path formed in a substrate for supplying a liquid to a plurality of the pressure chambers, the common liquid supply flow path passing through the substrate;
• a common liquid collection flow path formed in the substrate for collecting the liquid from the plurality of the pressure chambers, the common liquid supply flow path passing through the substrate;
• a flow path member that forms the common liquid supply flow path and the common liquid collection flow path;
• a pressure chamber forming member that forms the pressure chambers;
• and
• a through-hole forming member that forms liquid supply through-holes that connect the common liquid supply flow path and the pressure chambers, and liquid collection through-holes that connect the common liquid collection flow path and the pressure chambers,
• wherein the flow path member, the through-hole forming member and the pressure chamber forming member are laminated in the order as listed, and
• wherein the common liquid collection flow path, the first discharge port array, the common liquid supply flow path, and the second discharge port array are provided in the order as listed in the second direction as viewed from a direction in which the liquid is discharged from the discharge ports.

A liquid discharge head comprising:

• a discharge port array in which discharge ports for discharging a liquid are arranged in a first direction;
• pressure chambers communicating with the discharge ports and including piezoelectric elements that generate energy used to discharge the liquid at positions facing the discharge ports, the length of each of the pressure chambers in a second direction intersecting the first direction being larger than the length of the pressure chamber in the first direction;
• a common liquid supply flow path extending along the discharge port array for supplying the liquid to a plurality of the pressure chambers;
• a common liquid collection flow path extending along the discharge port array for collecting the liquid from the plurality of the pressure chambers;
• a flow path member that forms the common liquid supply flow path and the common liquid collection flow path;
• a pressure chamber forming member that forms the pressure chambers;
• and
• a through-hole forming member that forms liquid supply through-holes that connect the common liquid supply flow path and the pressure chambers, and liquid collection through-holes that connect the common liquid collection flow path and the pressure chambers,
• wherein the flow path member, the through-hole forming member and the pressure chamber forming member are laminated in the order as listed, and
• wherein each of the pressure chambers includes a supply opening communicating with the common liquid supply flow path on one end side thereof in the second direction, and includes a collection opening communicating with the common liquid collection flow path on the other end side thereof in the second direction.