Liquid discharge head and liquid discharge apparatus

A liquid discharge head comprising:

• a nozzle plate having multiple nozzles to discharge a liquid, the multiple nozzles arrayed in a first direction and a second direction intersecting the first direction;
• a pressure chamber substrate on the nozzle plate, the pressure chamber substrate having multiple pressure chambers respectively communicating with the multiple nozzles;
• multiple actuators, respectively disposed at the multiple nozzles, in the nozzle plate, the multiple actuators to respectively discharge the liquid in the multiple pressure chambers from the multiple nozzles;
• and
• a common chamber substrate on the pressure chamber substrate, the common chamber substrate having a common chamber communicating with each of the multiple pressure chambers;
• and
• multiple heat generators at both sides, in the first direction, of:
• the pressure chamber substrate;
• or
• the nozzle plate,
• the multiple heat generators arrayed in the second direction;
• and
• an extension portion to transfer a first amount of heat generated from the multiple heat generators in the common chamber in the first direction,
• wherein the extension portion transfers a second amount of the heat smaller than the first amount in the common chamber in the second direction.