Liquid ejection head, and liquid ejection apparatus

• US 10,442,203 B2
• Filed: 07/06/2018
• Issued: 10/15/2019
• Est. Priority Date: 07/12/2017
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Nakakubo, Toru, Kimura, Satoshi, Okushima, Shingo
• Primary Examiner(s): Thies, Bradley W
• Application Number:
  US16/028,846
• Publication Number:
  US 20190016137A1
• Time in Patent Office: 466 Days
• CPC Class Codes: B41J 2/14024 Assembling head parts
• CPC Class Codes: B41J 2/1404 Geometrical characteristics
• CPC Class Codes: B41J 2/16502 Printhead constructions to prevent nozzle clogging or facilitate nozzle cleaning
• CPC Class Codes: B41J 2/16505 Caps, spittoons or covers for cleaning or preventing drying out
• CPC Class Codes: B41J 2/16508 connected with the printer frame
• CPC Class Codes: B41J 2/16585 for paper-width or non-reciprocating print heads
• CPC Class Codes: B41J 2202/12 with ink circulating through the whole print head
• CPC Class Codes: B41J 2202/20 Modules

Abstract

A liquid ejection head and a liquid ejection apparatus capable of maintaining high reliability include a first cover member including an aperture and covering a surface of a flow path member facing a print medium of the liquid ejection head, a second cover member covering a side surface of the liquid ejection head, and a displacement absorption part that absorbs the displacement between the first cover member and the second cover member. Furthermore, the space between the aperture and the flow path member is sealed with a sealing material.

Claims

1. A liquid ejection head comprising:

a liquid ejection unit having a board including an ejection port surface configured to eject liquid, and a flow path member including a supporting surface that supports the board on the back side of the ejection port surface, the flow path member being configured to supply liquid to the board;

a first cover member including a first surface provided at the side of the ejection port surface and having an aperture part exposing the ejection port surface and a joint part joined to the liquid ejection unit, a second surface covering a part of a side surface of the flow path member, and a bent part bent between the first surface and the second surface; and

a second cover member at least covering another part of the side surface, wherein

a part of the second surface of the first cover member and a part of the second cover member overlap with each other.

2. The liquid ejection head according to claim 1, wherein

the flow path member has a first flow path member part including the supporting surface, and a second flow path member part supporting the first flow path member part, and

the second surface of the first cover member covers a side surface of the first flow path member part, and an end portion at a side opposite to the bent part of the second surface of the first cover member covers a part of a side surface of the second flow path member part.

3. The liquid ejection head according to claim 2, wherein the second cover member covers a side surface of the second flow path member part.

4. The liquid ejection head according to claim 1, wherein

the flow path member includes a protrusion on the supporting surface, and

the first surface of the first cover member is adhered to the protrusion.

5. The liquid ejection head according to claim 1, wherein the bent part extends along a longitudinal direction of the liquid ejection head.

6. The liquid ejection head according to claim 1, wherein the first cover member and the second cover member are made of conductive material.

7. The liquid ejection head according to claim 1, further comprising a wiring member electrically connected to the board and provided at a side of the side surface of the flow path member, wherein

the first cover member and the second cover member cover the wiring member.

8. The liquid ejection head according to claim 7, wherein

the wiring member further includes a third surface provided at a side of the supporting surface, and a bent part bent between the third surface and a fourth surface provided at a side of the side surface of the flow path member, and

the first cover member covers the third surface, a part of the fourth surface, and the bent part of the wiring member.

9. The liquid ejection head according to claim 8, wherein a space between a marginal part forming the aperture of the first surface of the first cover member, and the supporting surface of the flow path member and the third surface of the wiring member is sealed with a sealing material.

10. The liquid ejection head according to claim 7, wherein a gap is provided between the wiring member and an end portion of either the first cover member or the second cover member located at a side of the wiring member, in a part where the part of the second surface of the first cover member and the part of the second cover member overlap with each other.

11. The liquid ejection head according to claim 1, wherein the second cover member covers at least a part of the second surface of the first cover member.

12. The liquid ejection head according to claim 11, wherein an end portion of the second cover member covering the second surface of the first cover member is in contact with the first cover member, but an end portion at a side opposite to the bent part of the second surface of the first cover member is not in contact with the second cover member.

13. The liquid ejection head according to claim 11, wherein an end portion at a side opposite to the bent part of the first cover member is bent in an overlapping manner, in a part where the part of the second surface of the first cover member and the part of the second cover member overlap with each other.

14. The liquid ejection head according to claim 1, wherein a space between the first cover member and the second cover member is sealed with a sealing material, in a part where the part of the second surface of the first cover member and the part of the second cover member overlap with each other.

15. The liquid ejection head according to claim 14, wherein a space between a marginal part forming the aperture of the first surface of the first cover member and the supporting surfaces of the flow path member is sealed with a sealing material having a higher stiffness than the sealing material sealing the space between the first cover member and the second cover member.

16. The liquid ejection head according to claim 1, wherein a plurality of the boards are arranged along a longitudinal direction of the liquid ejection head so that the adjacent boards have parts partially overlapping with each other along the longitudinal direction.

17. A liquid ejection apparatus including the liquid ejection head according to claim 1 and a conveyance unit configured to convey a print medium that receives liquid ejected from the liquid ejection head.