Liquid ejection head

Patent metadata

Field	Value
Publication number	US-9469111-B2
Application number	US-201414477021-A
Country	US
Kind code	B2
Filing date	Sep 4, 2014
Priority date	Sep 24, 2013
Publication date	Oct 18, 2016
Grant date	Oct 18, 2016

Abstract

A liquid ejection head includes a plurality of ejection members, each having an ejection port for ejecting liquid and a liquid chamber for supplying liquid to the ejection port, a base substrate carrying the plurality of ejection members arranged thereon, the base substrate being provided with a common flow channel for supplying liquid to the plurality of liquid chambers, and a plurality of branch ports each allowing the common flow channel to communicate with the plurality of liquid chambers. Each of the branch ports is provided with a notch portion at an upstream side thereof as viewed in the flow direction of liquid flowing through the common flow channel.

First claim

What is claimed is:

1. A liquid ejection head comprising:
a plurality of ejection members that have an ejection port for ejecting liquid and a plurality of liquid chambers for supplying liquid to the ejection ports;
a base substrate carrying the plurality of ejection members arranged thereon, the base substrate being provided with a common flow channel for supplying liquid to the plurality of liquid chambers; and
a plurality of branch ports allowing the common flow channel to communicate with the plurality of liquid chambers, wherein
an opening portion, fronting the common flow channel, of each of the branch ports is provided with a notch portion at an upstream side thereof as viewed in the flow direction of liquid flowing through the common flow channel.

2. The liquid ejection head according to claim 1 , wherein
the notch portion of each of the branch ports is arranged at one of opposite ends of the branch port as viewed in a direction orthogonal to the flow direction of liquid flowing through the common flow channel.

3. The liquid ejection head according to claim 1 , wherein
each of the branch ports has a profile that is asymmetrical relative to a center line of the branch port running along the flow direction of liquid flowing through the common flow channel.

4. The liquid ejection head according to claim 1 , wherein
another notch portion that is different from the upstream side notch portion is formed at a downstream side of each of the branch ports as viewed in the flow direction of liquid flowing through the common flow channel.

5. The liquid ejection head according to claim 4 , wherein
the ejection members are arranged in a zigzag manner on the base substrate along a longitudinal direction of the base substrate, while
a single liquid chamber is arranged in each of the ejection members, and
the profile of the branch port arranged in each of the ejection members and that of the branch port arranged in an ejection member located next to the former ejection member in a direction orthogonal relative to the longitudinal direction are rotationally symmetrical.

6. The liquid ejection head according to claim 4 , wherein
the ejection members are arranged in a zigzag manner on the base substrate along a longitudinal direction of the base substrate, while
a plurality of liquid chambers are arranged in each of the ejection members, and
the profile of the plurality of branch ports arranged in each of the ejection members and that of the plurality of branch ports arranged in the ejection member located next to the former ejection member in a direction orthogonal relative to the longitudinal direction are rotationally symmetrical.

7. The liquid ejection head according to claim 5 , wherein
the branch port of each of the ejection members is formed at a position shifted from the center line of the ejection member running along the longitudinal direction.

8. The liquid ejection head according to claim 1 , wherein
each of the branch ports includes an introduction port arranged in the corresponding ejection member and communicating with the liquid chamber, and a distribution port arranged in the base substrate and communicating with the common flow channel, the introduction port and the distribution port communicating with each other, and
the base substrate being provided with a flow-in port for allowing liquid to flow into the common flow channel and a flow-out port for allowing liquid to flow out of the common flow channel.

9. The liquid ejection head according to claim 1 , wherein
each of the ejection members has a recording element substrate and a support member, and
the ejection port of each of the ejection members is formed in the recording element substrate thereof while the liquid chamber is formed in the support member, and
the recording element substrate of each of the ejection members is provided with a liquid supply port for supplying liquid from the liquid chamber to the ejection port.

10. A liquid ejection head comprising:
a plurality of ejection members that have an ejection port for ejecting liquid and a plurality of liquid chambers for storing liquid to be supplied to the ejection ports; and
a support member supporting the plurality of ejection members, the support member having a common flow channel for supplying liquid to the plurality of ejection members, wherein
the common flow channel communicates with the plurality of liquid chambers by way of respective openings, while an opening portion, fronting the common flow channel, of each of the openings is provided with a notch portion at an upstream side thereof as viewed in the flow direction of liquid flowing through the common flow channel and the upstream side of each of the openings has a profile that is asymmetrical relative to a line passing through the center of gravity of the opening and extending along the flow direction.

11. The liquid ejection head according to claim 10 , wherein
the notch portion of each of the openings is arranged at one of opposite ends of the opening as viewed in a direction orthogonal to the flow direction of liquid flowing through the common flow channel.

12. The liquid ejection head according to claim 10 , wherein
the plurality of ejection members are arranged along the common flow channel.

13. The liquid ejection head according to claim 10 , wherein
a second notch portion is formed in each of the openings at a downstream side thereof as viewed in the flow direction of liquid flowing through the common flow channel.

Assignees

• Canon Kk

Inventors

• Yamada Kazuhiro
• Moriya Takatsugu
• Tamenaga Zentaro

Classifications

• B41J2/19

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• B41J2202/20

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• B41J2202/11

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• B41J2/17503

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• B41J2/17596

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