Liquid discharge head, liquid discharge head unit, and liquid discharge apparatus

A liquid discharge head comprising:

• a nozzle plate having multiple nozzles;
• a diaphragm facing an inner face of the nozzle plate;
• multiple individual chambers between the nozzle plate and the diaphragm, the multiple individual chambers respectively communicating with the multiple nozzles;
• multiple actuators on a first face of the diaphragm opposite to a second face of the diaphragm facing the multiple individual chambers, the multiple actuators to deform the diaphragm to discharge a liquid in the multiple individual chambers from the multiple nozzles, respectively;
• a holder facing the multiple actuators and the diaphragm and joined to a peripheral portion of the diaphragm;
• a first joint at a first position around a periphery of the holder and joining the diaphragm and the holder;
• multiple second joints joining the diaphragm and the holder at multiple second positions inside the first position, respectively;
• multiple housing areas each disposed between two of the multiple second joints, the multiple housing areas respectively housing the multiple actuators;
• a non-joint area in which the diaphragm and the holder are not joined in a region except the first joint, the multiple second joints, and the multiple housing areas in the first joint;
• a liquid supply channel penetrating through the holder and the diaphragm, the liquid supply channel disposed outside the multiple housing areas in the first joint;
• and
• a third joint around the liquid supply channel and joining the diaphragm and the holder,
• wherein an area of the non-joint area in the holder is larger than an area joined by the first joint, the multiple second joints, and the third joint.