IP Library › Granted Patent US 12661902

Granted Patent B2

US 12661902 · App. 18/082,933 · Granted Jun 23, 2026

Liquid ejection head and liquid ejection apparatus

Inventors: Yosuke Takagi (Kanagawa, JP); Chiaki Muraoka (Saitama, JP); Kyosuke Toda (Kanagawa, JP); Takeho Miyashita (Kanagawa, JP); Shimpei Yoshikawa (Kanagawa, JP)

Assignee: Canon Kabushiki Kaisha

B41J2/18

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Quick Facts

Patent No.: US 12661902
App. No.: 18/082,933
Granted: Jun 23, 2026
Kind: B2

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Abstract

A liquid ejection head and liquid ejection apparatus capable of preventing a deterioration in ink circulation efficiency in the vicinities of ejection ports and an increase in apparatus size include a common supply channel and a common collection channel as separate channels. Ink supplied from the common supply channel is supplied to a pressure chamber through a supply connection channel, and collected from the pressure chamber into the common collection channel through a collection connection channel. Also, the ink is caused to flow along a main scanning direction through the pressure chamber.

Claims (50)

1 . A liquid ejection head which ejects a liquid while moving in a main scanning direction, comprising:

an ejection module configured to eject the liquid; and

a circulation unit configured to circulate the liquid by supplying the liquid to the ejection module and collecting the liquid from the ejection module, wherein

the ejection module includes:

an ejection port,

a pressure chamber communicating with the ejection port,

a heater configured to eject the liquid through the ejection port and provided in the pressure chamber facing the ejection port,

a supply channel through which the liquid is supplied to the pressure chamber, and

a collection channel which is provided separate from the supply channel and through which the liquid is collected from the pressure chamber,

the circulation unit includes a first pressure adjustment unit, a second pressure adjustment unit, and a circulation pump configured to send liquid from the second pressure adjustment unit to the first pressure adjustment unit, and

the liquid flows along the main scanning direction through the pressure chamber.

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

in the ejection module, a plurality of ejection ports form an ejection port array in an ejection port surface, the ejection port array forming a line in a direction crossing the main scanning direction, and

the supply channel and the collection channel are provided along the ejection port array with the ejection port array therebetween as viewed from a vertical direction perpendicularly crossing the ejection port surface.

3 . The liquid ejection head according to claim 2 , wherein the supply channel and the collection channel have substantially a same length as a length of the ejection port array.

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

the ejection module includes a plurality of the ejection port arrays for respectively ejecting types of liquids,

the plurality of ejection port arrays are provided to be line-symmetric about a line parallel to an array direction of the ejection ports of the ejection port arrays, and

an order of the types of the liquids to be ejected from the ejection ports of the ejection port arrays is line-symmetric about the line.

5 . The liquid ejection head according to claim 4 , wherein flow directions of the liquids in the pressure chambers are directions toward the line.

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

the types of the liquids comprise colors of the liquids.

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

a plurality of the ejection modules are included in a same plane for respectively ejecting types of liquids through respective ejection port arrays,

the plurality of ejection modules are provided to be line-symmetric about a line parallel to an array direction of the ejection ports of the ejection port arrays, and

an order of the types of the liquids to be ejected from the ejection ports of the ejection port arrays is line-symmetric about the line.

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

the types of the liquids comprise colors of the liquids.

9 . The liquid ejection head according to claim 1 , wherein plural pressure chambers are provided in a corresponding relation with plural ejection ports,

plural supply connection channels are provided in a corresponding relation with the pressure chambers, the plural supply connection channels being connected to the supply channel and respectively connected to the corresponding pressure chamber, and

plural collection connection channels are provided in a corresponding relation with the pressure chambers, the plural collection connection channels being connected to the collection channel and respectively connected to the corresponding pressure chamber.

10 . The liquid ejection head according to claim 1 , wherein the liquid ejection head is configured to be capable of supplying the liquid to the pressure chamber from the collection channel.

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

the element in which the ejection port and the pressure chamber are formed is stacked on a substrate in which the heater is provided.

12 . A liquid ejection apparatus comprising:

a liquid ejection unit configured to eject a liquid; and

a movement unit configured to move the liquid ejection unit in a main scanning direction, wherein

the liquid ejection unit includes:

an ejection module configured to eject the liquid, and

a circulation unit configured to circulate the liquid by supplying the liquid to the ejection module and collecting the liquid from the ejection module,