Liquid discharge head, head module, and liquid discharge apparatus

A liquid discharge head comprising:

• a nozzle substrate having multiple nozzles;
• a pressure chamber substrate over the nozzle substrate,
• the pressure chamber substrate having pressure chambers respectively communicating with the multiple nozzles;
• a first substrate over the pressure chamber substrate, the first substrate having:
• a common channel communicating with each of the pressure chambers;
• a first face opposed to the pressure chamber substrate;
• a second face opposite the first face;
• a first rigidity portion having a first rigidity;
• and
• a second rigidity portion having a second rigidity lower than the first rigidity;
• and
• a second substrate over the first substrate, the second substrate having:
• a third face opposed to the second face of the first substrate;
• a fourth face opposite the third face;
• a third rigidity portion having a third rigidity, the third rigidity portion joined to the second rigidity portion of the first substrate;
• and
• a fourth rigidity portion having a fourth rigidity lower than the third rigidity, the fourth rigidity portion joined to the first rigidity portion of the first substrate.