DROPLET DISCHARGING HEAD, DROPLET DISCHARGING DEVICE AND FUNCTIONAL-FILM FORMING DEVICE

Abstract

A droplet discharging head includes a first through hole having an outlet for discharging of a liquid material and a second through hole having an inlet for injection of the liquid material, the second through hole having a protrusion on

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements.

FIG. 1 is a sectional view schematically showing the structure of a droplet discharging head according to one embodiment of the invention.

FIG. 2 is a schematic showing the structure of a droplet discharging device according to one embodiment of the invention.

FIG. 3A is a schematic showing a section, being parallel to the flow path of droplets, of a nozzle portion in a droplet discharging head according to a first embodiment of the invention.

FIG. 3B is a plan view schematically showing the nozzle portion when it is observed from the direction a shown in FIG. 3A.

FIG. 4A is a schematic showing a section, being parallel to the flow path of droplets, of a nozzle portion in a droplet discharging head according to a modification of the first embodiment.

FIG. 4B is a plan view schematically showing the nozzle portion when it is observed from the direction a shown in FIG. 4A.

FIG. 5A is a schematic showing a section, being parallel to the flow path of droplets, of a nozzle portion of a droplet discharging head according to a second embodiment of the invention.

FIG. 5B is a plan view schematically showing the nozzle portion when it is observed from the direction a shown in FIG. 5A.

FIG. 6A is a schematic showing a section, being parallel to the flow path of droplets, of a nozzle portion of a droplet discharging head according to a modification of the second embodiment.

FIG. 6B is a plan view schematically showing the nozzle portion when it is observed from the direction a shown in FIG. 6A.

FIG. 7A is a sectional view schematically showing another example of the structure of the droplet discharging head according to one embodiment of the invention.

FIG. 7B is a sectional view schematically showing details of a control portion according to the above example.

FIG. 8A is a sectional view schematically showing another example of the shape of an inner nozzle hole 102 of a droplet discharging head according to one embodiment of the invention.

FIG. 8B is a plan view schematically showing the inner nozzle hole 102 of the above example when it is observed from the direction a shown in FIG. 8A.

FIG. 9A is a schematic showing a section, being parallel to the flow path of droplets, of a nozzle portion of a droplet discharging head according to a fourth embodiment of the invention.

FIG. 9B is a plan view schematically showing the nozzle portion of the fourth embodiment when it is observed from the direction a shown in FIG. 9A.

Claims

1. A droplet discharging head, comprising: a first through hole with an outlet for discharging of a liquid material; anda second through hole with an inlet for injection of the liquid material, the second through hole having a protrusion on surface.

2. 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, the second through hole having a plurality of protrusions on surface; anda control portion that is placed on the cavity and controls the discharging of the liquid material.

3. The droplet discharging head according to claim 1, at least one of the plurality of protrusions having a larger sectional area toward the outlet than toward the inlet.

4. The droplet discharging head according to claim 1, the second through hole having a tapered shape.

5. The droplet discharging head according to claim 1, the second through hole having a columnar shape.

6. 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 on surface, each of the plurality of protrusions having a larger sectional area toward the outlet than toward the inlet; anda control portion that is placed on the cavity and controls the discharging of the liquid material.

7. The droplet discharging head according to claim 1, at least one of the plurality of protrusions including a cross section perpendicular to a flow path of the liquid material, the cross section having a symmetric shape with respect to a line passing through center of the flow path.

8. The droplet discharging head according to claim 1, at least one of the plurality of protrusions including a cross section perpendicular to the flow path, the cross section having a shape that includes an acute angle.

9. The droplet discharging head according to claim 1, at least one of a plurality of protrusions being formed in a straight line running from an end at the inlet through to another end at the outlet.

10. The droplet discharging head according to claim 1, at least one of a plurality of protrusions having an end at the inlet and another end at the outlet, the ends being in a positional relationship that is out of alignment by an angle of about 90 degrees.

11. The droplet discharging head according to claim 1, the control portion being a piezoelectric element that changes volume of the cavity.

12. The droplet discharging head according to claim 1, the control portion being a heater that heats the cavity.

13. A droplet discharging device comprising the droplet discharging head according to claim 1.

14. A functional-film forming device comprising the droplet discharging head according to claim 1.