Droplet discharging head with a through hole having a protrusion on a surface, droplet discharging device and a functional-film forming device

A droplet discharging head, comprising:

• a base body that includes a cavity for holding of a liquid material and a nozzle portion for discharging of the liquid material from the cavity,
• the nozzle portion having a first through hole with an outlet for discharging of the liquid material and a second through hole with an inlet for injection of the liquid material,
• at least one of the first through hole and the second through hole having protrusions toward a center line of the hole from an inside wall of the hole, and
• the protrusions are separately distributed along a circumferential direction in the hole and are continuously distributed along the center line of the hole;
• and
• a control portion that is placed on the cavity and controls the discharging of the liquid material.

A droplet discharging head comprising:

• a base body that includes a cavity for holding of a liquid material and a nozzle portion for discharging of the liquid material,
• the nozzle portion including a through hole that has an outlet for discharging of the liquid material and an inlet for injection of the liquid material,
• the through hole having a plurality of protrusions from a center line of the hole to an inside wall of the hole, and
• each of the plurality of protrusions having a larger sectional area toward the outlet than toward the inlet;
• and
• a control portion that is placed on the cavity and controls the discharging of the liquid material.