Liquid discharging head and liquid discharging device

Patent metadata

Field	Value
Publication number	US-10112387-B2
Application number	US-201715655231-A
Country	US
Kind code	B2
Filing date	Jul 20, 2017
Priority date	Jul 22, 2016
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

A liquid discharging head includes a discharge port that discharges a liquid, a pressure chamber that communicates with the discharge port, and an energy generating element that is disposed in the pressure chamber. In the liquid discharging head, the discharge port is provided with a plurality of projections that project towards a central portion of the discharge port from an inner peripheral edge of the discharge port, and an interval between the projections at a location where the projections are closest to each other is 5 μm or less.

First claim

What is claimed is:

1. A liquid discharging head comprising:
a discharge port that discharges a liquid;
a pressure chamber that communicates with the discharge port;
an energy generating element that is disposed in the pressure chamber;
a supply path that supplies a liquid to the pressure chamber; and
a recovery path that recovers the liquid from the pressure chamber,
wherein the discharge port is provided with a plurality of projections that project towards a central portion of the discharge port from an inner peripheral edge of the discharge port,
wherein an interval between the projections at a location where the projections are closest to each other is 5 μm or less, and
wherein the supply path and the recovery path are connected to the pressure chamber so as to allow a circulatory flow of a liquid flowing from the supply path to the recovery path via the pressure chamber to be generated.

2. The liquid discharging head according to claim 1 , wherein the discharge port has a linearly symmetrical shape.

3. The liquid discharging head according to claim 2 , wherein a symmetry axis of the linearly symmetrical shape of the discharge port is parallel to a direction of flow of a liquid that passes through the pressure chamber.

4. The liquid discharging head according to claim 1 , wherein leading end portions of the plurality of projections oppose each other.

5. The liquid discharging head according to claim 1 , wherein center lines of the plurality of projections are on a same line.

6. The liquid discharging head according to claim 1 , wherein leading end portions of the plurality of projections do not oppose each other.

7. The liquid discharging head according to claim 1 , wherein the projections extend parallel to a direction of flow of a liquid that passes through the pressure chamber.

8. The liquid discharging head according to claim 1 , wherein each projection has a tapering shape in which a width of a base thereof that projects from the inner peripheral edge of the discharge port is larger than a width of a leading end portion thereof.

9. The liquid discharging head according to claim 1 , wherein the energy generating element is disposed as a location opposing the discharge port, and a distance from the energy generating element to the discharge port is 12 μm or less.

10. The liquid discharging head according to claim 1 , further comprising:
a substrate; and
a discharge port forming member that is placed on the substrate,
wherein the discharge port forming member has a liquid discharge path extending through the discharge port forming member,
wherein the discharge port is an open end of the liquid discharge path that opens in a surface of the discharge port forming member that is opposite to a surface of the discharge port forming member on which the substrate is placed, and
wherein the pressure chamber is disposed between the substrate and the discharge port forming member, and communicates with the liquid discharge path.

11. The liquid discharging head according to claim 10 , wherein a thickness of the discharge port forming member is 6 μm or less.

12. The liquid discharging head according to claim 10 , wherein a length of the liquid discharge path in a liquid discharge direction is 6 μm or less.

13. The liquid discharging head according to claim 10 , wherein H which is a height of a channel in a thickness direction of the discharge port forming member and the substrate, P which is a length of the liquid discharge path in a liquid discharge direction, and W which is a length of the discharge port along a direction of flow of a liquid that passes through the pressure chamber satisfy a relationship: H −0.34 ×P −0.66 ×W>1.7, with the channel being disposed on an upstream side of the pressure chamber in the direction of the flow of the liquid that passes through the pressure chamber.

14. The liquid discharging head according to claim 1 , wherein a liquid having a viscosity that is 15 cP or less is discharged.

15. The liquid discharging head comprising:
a discharge port that discharges a liquid;
a pressure chamber that communicates with the discharge port;
an energy generating element that is disposed in the pressure chamber;
a supply path that supplies a liquid to the pressure chamber; and
a recovery path that recovers the liquid from the pressure chamber,
wherein part of the discharge port is narrowed, and is shortest diameter of the part of the discharge port that has been narrowed is 5 μm or less, and
wherein the supply path and the recovery path are connected to the pressure chamber so as to allow a circulatory flow of a liquid flowing from the supply path to the recovery path via the pressure chamber to be generated.

16. The liquid discharging head according to claim 15 , wherein the shortest diameter extends through a center of the discharge port.

17. A liquid discharging device comprising:
a liquid discharging head including:
a discharge port that discharges a liquid;
a pressure chamber that communicates with the discharge port; and
an energy generating element that is disposed in the pressure chamber,
wherein the discharge port is provided with a plurality of projections that project towards a central portion of the discharge port from an inner peripheral edge of the discharge port, and
wherein an interval between the projections at a location where the projections are closest to each other is 5 μm or less;
a supply path that supplies a liquid to the pressure chamber; and
a recovery path that recovers the liquid from the pressure chamber,
wherein the supply path and the recovery path are connected to the pressure chamber so as to allow a circulatory flow of a liquid flowing from the supply path to the recovery path via the pressure chamber to be generated; and

a liquid supplying system that is connected to the supply path and the recovery path, and includes a tank which stores a liquid and a pump which causes the liquid to flow.

18. The liquid discharging device according to claim 17 , wherein the liquid discharging head and the liquid supplying system form a circulation channel of the liquid that passes through the pressure chamber.

19. liquid discharging head comprising:
a discharge port that discharges a liquid;
a pressure chamber that communicates with the discharge port; and
an energy generating element that is disposed in the pressure chamber,
wherein the discharge port is provided with a plurality of projections that project towards a central portion of the discharge port from an inner peripheral edge of the discharge port,
wherein an interval between the projections at a location where the projections are closest to each other is 5 μm or less, and
wherein leading end portions of the plurality of projections do not oppose each other.

20. liquid discharging head comprising:
a discharge port that discharges a liquid;
a pressure chamber that communicates with the discharge port; and
an energy generating element that is disposed in the pressure chamber,
wherein the discharge port is provided with a plurality of projections that project towards a central portion of the discharge port from an inner peripheral edge of the discharge port,
wherein an interval between the projections at a location where the projections are closest to each other is 5 μm or less, and
wherein the energy generating element is disposed as a location opposing the discharge port, and a distance from the energy generating element to the discharge port is 12 μm or less.

Assignees

• Canon Kk

Inventors

• Moriya Takatsugu
• Iwanaga Shuzo
• Kasai Shintaro
• Nakagawa Yoshiyuki
• Saito Akiko
• Yamada Tatsuya
• Sato Tomohiro
• IWASAKI Ayako
• Ishiwata Tomoki
• Ishida Koichi

Classifications

• B41J2/14056

  Plural heating elements per ink chamber · CPC title

• B41J2202/19

  Assembling head units · CPC title

• B41J2202/12

  with ink circulating through the whole print head · CPC title

• B41J2202/21

  Line printing · CPC title

• B41J2202/20

  Modules · CPC title