Patent ID: 8894182

Claim:
A liquid discharge head comprising: a plurality of liquid discharge substrates having a discharge port array in which a plurality of discharge ports configured to discharge liquid are arranged, and a plurality of thermoelectric conversion elements configured to generate energy for discharging liquid from the plurality of discharge ports; and a channel member having a mounted face on which the liquid discharge substrates are mounted, channels configured to supply liquid to the plurality of discharge ports, and a low thermal conductivity portion having a lower thermal conductivity than that of a wall forming the channel, wherein the channels include an opening configured to flow liquid, which is provided at a part except for both ends of the discharge port array in an arrangement direction in which the plurality of discharge ports is arranged on the backside of the mounted face, a first channel configured to pass the liquid flowed from the opening and to pass liquid along the arrangement direction, and a second channel configured to pass the liquid flowing through the first channel in a direction opposite to the liquid flowing direction in the first channel, wherein the opening, the first channel, the low thermal conductivity portion, and the second channel are provided in this order in a direction vertical to the mounted face, wherein the opening and the low thermal conductivity portion are provided to be at least partially overlapped one above the other in the vertical direction to the mounted face, and wherein the opening is provided not to be overlapped on the liquid discharge substrates in the vertical direction.