Liquid discharge head, liquid discharge device, and liquid discharge apparatus

A liquid discharge head, comprising:

• a plurality of nozzles from which a liquid is discharged;
• a plurality of pressure chambers communicating with the plurality of nozzles, respectively;
• a substrate in which the plurality of pressure chambers is arranged in a predetermined direction;
• a diaphragm provided on a first side of the substrate opposite a second side of the substrate facing the plurality of nozzles, the diaphragm forming walls of the plurality of pressure chambers;
• and
• a plurality of electromechanical transducer elements provided on the diaphragm corresponding to the plurality of pressure chambers, respectively,
• wherein a groove is formed in the substrate on an end side of the plurality of pressure chambers in the predetermined direction,
• the groove includes an opening that opens toward a direction opposite to the diaphragm,
• the diaphragm at the groove is formed to be deflexed opposite to the opening of the groove, and
• a radius of curvature Ra of the diaphragm at the groove is equal to or larger than 5000 μm.

A liquid discharge head, comprising:

• a plurality of nozzles from which a liquid is discharged;
• a plurality of pressure chambers communicating with the plurality of nozzles, respectively;
• a substrate in which the plurality of pressure chambers is arranged in a predetermined direction;
• a diaphragm provided on a first side of the substrate opposite a second side of the substrate facing the plurality of nozzles, the diaphragm forming walls of the plurality of pressure chambers;
• and
• a plurality of electromechanical transducer elements provided on the diaphragm corresponding to the plurality of pressure chambers, respectively,
• wherein a groove is formed in the substrate on an end side of the plurality of pressure chambers in the predetermined direction,
• the groove includes an opening that opens toward a direction opposite to the diaphragm,
• the diaphragm at the plurality of pressure chambers is formed to be deflexed toward the plurality of pressure chambers, and
• the diaphragm at the groove is formed to be deflexed opposite to the opening of the groove.