Liquid discharge head and method of manufacturing the liquid discharge head

Patent metadata

Field	Value
Publication number	US-12269271-B2
Application number	US-202318188372-A
Country	US
Kind code	B2
Filing date	Mar 22, 2023
Priority date	Apr 28, 2022
Publication date	Apr 8, 2025
Grant date	Apr 8, 2025

Abstract

A liquid discharge head includes i) a recording-element substrate configured to discharge a liquid, ii) a cuboid-like liquid tank configured to support the recording-element substrate and to store the liquid to be discharged from the recording-element substrate, and iii) an absorbent accommodated in a compressed state in the liquid tank and configured to absorb and hold the liquid. In the liquid discharge head, multiple projections are formed on a bottom of the liquid tank. In addition, as viewed in plan in a direction orthogonal to the bottom, the projections are disposed so as to surround or straddle an injection position at which the liquid is injected into the absorbent using an injection needle.

First claim

What is claimed is:

1. A liquid discharge head, comprising:
a recording-element substrate configured to discharge a liquid;
a cuboid-like liquid tank configured to support the recording-element substrate and to store the liquid to be discharged from the recording-element substrate; and
an absorbent accommodated in a compressed state in the liquid tank and configured to absorb and hold the liquid,
wherein multiple projections are formed on a bottom of the liquid tank, and
wherein as viewed in plan in a direction orthogonal to the bottom, the projections are disposed so as to surround or straddle an injection position at which the liquid is injected into the absorbent using an injection needle.

2. The liquid discharge head according to claim 1 ,
wherein the bottom of the liquid tank is shaped like a rectangle, and
wherein the injection position is positioned at a center of the absorbent in a transverse direction of the bottom as viewed in plan.

3. The liquid discharge head according to claim 2 ,
wherein the projections are not positioned on a straight line drawn so as to pass through the injection position in the transverse direction of the bottom.

4. The liquid discharge head according to claim 3 ,
wherein the projections are not positioned within a region of ±5 degrees from the straight line with the injection position being at the center.

5. The liquid discharge head according to claim 4 ,
wherein when a distance between any one of the projections positioned most closely to a side wall of the liquid tank and the side wall is denoted by L and a length of the bottom in the transverse direction thereof is denoted by W as viewed in plan, L≥W/9 holds for the projections.

6. The liquid discharge head according to claim 2 ,
wherein as viewed in plan, the projections are disposed symmetrically with respect to a center line of the bottom extending in a longitudinal direction thereof.

7. The liquid discharge head according to claim 1 ,
wherein the bottom of the liquid tank is shaped like a square, and
wherein as viewed in plan, the projections are disposed radially with the inject ion position being at a center.

8. The liquid discharge head according to claim 1 ,
wherein any one of the projections is not disposed at a position overlapping the injection position as viewed in plan.

9. The liquid discharge head according to claim 1 ,
wherein multiple other projections are formed on the bottom of the liquid tank and each of the other projections is smaller than any one of the projections.

10. The liquid discharge head according to claim 9 , further comprising:
a filter disposed at the bottom of the liquid tank and configured to capture foreign matter in the liquid supplied from the liquid tank to the recording-element substrate,
wherein the other projections are disposed on the bottom on a side opposite to a side on which the filter is disposed with respect to the projections.

11. The liquid discharge head according to claim 9 , further comprising:
a filter disposed at the bottom of the liquid tank and configured to capture foreign matter in the liquid supplied from the liquid tank to the recording-element substrate,
wherein the other projections are disposed on the bottom around the filter.

12. The liquid discharge head according to claim 1 ,
wherein each of the projections is shaped like a cone or a pyramid.

13. The liquid discharge head according to claim 1 ,
wherein each of the projections has surface irregularities.

14. The liquid discharge head according to claim 1 ,
wherein the projections includes at least one projection subjected to liquid-philic treatment.

15. The liquid discharge head according to claim 1 ,
wherein multiple injection positions are set in the absorbent, and the projections are disposed for each of the injection positions.

16. A liquid discharge head, comprising:
a recording-element substrate configured to discharge a liquid;
a cuboid-like liquid tank configured to support the recording-element substrate and to store the liquid to be discharged from the recording-element substrate; and
an absorbent accommodated in a compressed state in the liquid tank and configured to absorb and hold the liquid,
wherein a puncture is present on a surface of the absorbent positioned opposite to a surface of the absorbent facing a bottom of the liquid tank, the puncture being formed due to an injection needle for injecting the liquid into the liquid tank being inserted into the absorbent,
wherein multiple projections are formed on the bottom of the liquid tank, and
wherein as viewed in plan in a direction orthogonal to the bottom, the projections are disposed so as to surround or straddle the puncture.

17. A method of manufacturing a liquid discharge head, the method comprising:
providing a cuboid-like liquid tank configured to support a recording-element substrate that discharges a liquid and configured to store the liquid to be discharged from the recording-element substrate;
installing an absorbent in a compressed state into the liquid tank, the absorbent being configured to absorb and hold the liquid; and
inserting an injection needle into the absorbent and injecting the liquid through the injection needle into the liquid tank,
wherein the providing the liquid tank includes forming multiple projections on a bottom of the liquid tank at positions surrounding or straddling a position at which the injection needle is to be inserted in the absorbent as viewed in plan in a direction orthogonal to the bottom.

Assignees

• Canon Kk

Inventors

• Sato Motoaki
• Iri Junichiro

Classifications

• B41J2/17556

  Means for regulating the pressure in the cartridge · CPC title

• B41J2/17559 Primary

  Cartridge manufacturing · CPC title

• B41J2/17553

  Outer structure · CPC title

• B41J2/17513

  Inner structure · CPC title

• B41J2/17523 Primary

  Ink connection · CPC title