Liquid ejection head and liquid ejection apparatus

Patent metadata

Field	Value
Publication number	US-2024300236-A1
Application number	US-202418598785-A
Country	US
Kind code	A1
Filing date	Mar 7, 2024
Priority date	Mar 8, 2023
Publication date	Sep 12, 2024
Grant date	—

Abstract

An object is to provide a liquid ejection head capable of efficiently dissipating heat generated at the time of liquid ejection. The liquid ejection head includes a storage portion storing liquid; an ejection portion provided with a nozzle to eject liquid and an element to generate energy to eject liquid from the nozzle; and a flow path portion having a flow path capable of supplying liquid from the storage portion to the ejection portion. In a second direction orthogonal to a first direction which is a direction of supply of liquid from the storage portion to the ejection portion, the flow path portion includes a narrow width portion smaller in width than the storage portion and the ejection portion.

First claim

What is claimed is:

1 . A liquid ejection head comprising:
a storage portion storing liquid; an ejection portion provided with a nozzle to eject liquid and an element to generate energy to eject liquid from the nozzle; and a flow path portion having a flow path capable of supplying liquid from the storage portion to the ejection portion, wherein in a second direction orthogonal to a first direction which is a direction of supply of liquid from the storage portion to the ejection portion, the flow path portion includes a narrow width portion smaller in width than the storage portion and the ejection portion.

2 . The liquid ejection head according to claim 1 , configured to eject liquid while moving in the second direction.

3 . The liquid ejection head according to claim 1 , wherein
in the second direction, a minimum width of the narrow width portion is equal to or less than 16% of a maximum width of the flow path portion.

4 . The liquid ejection head according to claim 3 , wherein
a ratio between the maximum width and the minimum width is 6.25:1.00 to 7.50:1.00.

5 . The liquid ejection head according to claim 3 , wherein
the maximum width is from 15 mm to 25 mm inclusive, and the minimum width is from 2 mm to 4 mm inclusive.

6 . The liquid ejection head according to claim 1 , wherein
the narrow width portion is provided with a rib.

7 . The liquid ejection head according to claim 6 , wherein
the rib has a polygonal shape.

8 . The liquid ejection head according to claim 1 , wherein
a thickness of a thin portion at which a thickness between an outer wall of the narrow width portion and an inner wall of the flow path is smallest is equal to or less than 45% of a thickness of a thick portion at which the thickness between the outer wall of the narrow width portion and the inner wall of the flow path is largest.

9 . The liquid ejection head according to claim 8 , wherein
a ratio between the thickness of the thin portion and the thickness of the thick portion is 1.00:2.25 to 1.00:2.90.

10 . The liquid ejection head according to claim 8 , wherein
the thickness of the thin portion is from 0.8 mm to 1.2 mm inclusive.

11 . The liquid ejection head according to claim 8 , wherein
the thickness of the thick portion is from 2.3 mm to 2.7 mm inclusive.

12 . The liquid ejection head according to claim 1 , wherein
a first distance between an endmost portion of the flow path portion in a width direction and an end of a narrowest portion of the narrow width portion is equal to or greater than 135% of a second distance between the endmost portion and an end of a widest portion of the narrow width portion.

13 . The liquid ejection head according to claim 12 , wherein
a ratio between the second distance and the first distance is 1.00:1.35 to 1.00:1.50.

14 . The liquid ejection head according to claim 12 , wherein
the first distance is from 7.5 mm to 9.5 mm inclusive, and the second distance is from 5.0 mm to 7.0 mm inclusive.

15 . The liquid ejection head according to claim 1 , wherein
the element is a heater.

16 . The liquid ejection head according to claim 1 , wherein
the storage portion separately stores different types of liquids, the flow path portion has the flow paths capable of supplying the different types of liquids, respectively, from the storage portion to the ejection portion, and the ejection portion is configured to eject each of the different types of liquids.

17 . A liquid ejection apparatus comprising:
a carriage on which a liquid ejection head is mountable, the liquid ejection head comprising a storage portion, an ejection portion, and a flow path portion, the storage portion storing liquid, the ejection portion being provided with a nozzle to eject liquid and an element to generate energy to eject liquid from the nozzle, the flow path portion having a flow path capable of supplying liquid from the storage portion to the ejection portion; and a control unit to cause the liquid ejection head to eject liquid, wherein in a second direction orthogonal to a first direction which is a direction of supply of liquid from the storage portion to the ejection portion, the flow path portion includes a narrow width portion smaller in width than the storage portion and the ejection portion, and the control unit moves the carriage in the second direction.

Assignees

• Canon Kk

Inventors

• Koshikawa Hiroshi
• Iinuma Keisuke
• Tsukuda Keiichiro
• Nanjo Tatsuo
• Hayasaka Takashi
• Noda Masato
• Takahashi Wataru

Classifications

• B41J29/13

  Cases or covers · CPC title

• B41J2/17553

  Outer structure · CPC title

• B41J2/175

  Ink supply systems {; Circuit parts therefor} · CPC title

• B41J2/17513 Primary

  Inner structure · CPC title

• B41J2002/14306

  Flow passage between manifold and chamber · CPC title