# US 11,077,658 B2 · Liquid ejection head and method of manufacturing the same

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- Number: US 11,077,658 B2
- Document ID: US11077658B2
- Status: Granted
- Kind: B2
- Application number: 16/556,087
- Filed: 2019-08-29
- Published: 2020-03-05
- Granted: 2021-08-03
- Earliest claimed: 2018-09-05
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Tomoki Ishiwata; Shuzo Iwanaga; Masaki Oikawa; Keiji Tomizawa; Tomohiro Sato; Akiko Hammura; Chiaki Muraoka; Shimpei Yoshikawa
- Web page: https://patentgrep.com/patent/US11077658B2

## CPC

- B41J 2/14072: {Electrical connections, e.g. details on electrodes, connecting the chip to the outside...}
- B41J 2/16: Production of nozzles
- B41J 2/14024: {Assembling head parts}
- B41J 2/162: {Manufacturing of the nozzle plates}
- B41J 2/1623: {bonding and adhesion}
- B41J 2/1631: {photolithography}
- B41J 2/1645: {thin film formation by spincoating}
- B41J 2202/11: characterised by specific geometrical characteristics
- B41J 2202/19: Assembling head units
- B41J 2202/22: Manufacturing print heads
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

A liquid injection head improving electric reliability includes: a substrate including: energy generating elements configured to apply energy for ejection to a liquid, and a substrate upper surface on which terminals respectively connected to electric wirings are provided, an ejection port forming member having: an ejection port forming surface in which the ejection ports for ejecting a liquid are formed, and a back surface on a side opposite to the ejection port forming surface, which is arranged so as to opposite to the substrate upper surface, and a sealant configured to cover connecting portions between the electric wirings and the terminals.

## Claims

### Claim 1

A liquid injection head comprising:
a substrate including:
energy generating elements configured to apply energy for ejection to a liquid; and
a substrate upper surface on which terminals respectively connected to electric wirings are provided;
an ejection port forming member having:
an ejection port forming surface in which ejection ports for ejecting a liquid are formed, and having an end region which includes at least one cutout; and
a back surface on a side opposite to the ejection port forming surface, which is arranged so as to opposite to the substrate upper surface; and
a sealant configured to cover connecting portions between the electric wirings and the terminals,
wherein at least an ejection port region of the ejection port forming surface, in which the ejection ports are formed, is formed as a high water-repellency region,
wherein the end region of the ejection port forming surface, which is located between the ejection port region and the terminals when the substrate upper surface is viewed in plan view, is formed as a low water-repellency region having water repellency lower than water repellency of the high water-repellency region, and
wherein at least a part of the end region including the cutout is covered with the sealant,
wherein, when an opening width of the cutout on the ejection port forming surface is set to 2R, a density of the sealant is set to ρ, a surface tension of the sealant is set to σ, and a gravitational acceleration is set to g, the cutout is formed so as to satisfy;
2
3
⁢
π
⁢
⁢
R
⁢
⁢
ρ
⁢
⁢
g
>
σ
π
⁢
⁢
R
.

### Claim 2 (depends on 1)

The liquid ejection head according to claim 1,
wherein, when an opening width of the cutout on the ejection port forming surface is set to 2R and a depth of the cutout is set to D, the cutout is formed so as to satisfy:
2R>D.

### Claim 3 (depends on 1)

The liquid ejection head according to claim 1,
wherein the ejection port forming member includes:
a top plate through which the ejection ports are formed; and
a flow passage member configured to communicate with the ejection ports and form a supply flow passage for the liquid, and
wherein the cutout is formed to pass through the top plate and the flow passage member.

### Claim 4 (depends on 1)

The liquid ejection head according to claim 1, wherein the sealant covers an entire surface of the end region.

### Claim 5

A liquid injection head comprising:
a substrate including:
energy generating elements configured to apply energy for ejection to a liquid; and
a substrate upper surface on which terminals respectively connected to electric wirings are provided;
an ejection port forming member having:
an ejection port forming surface in which ejection ports for ejecting a liquid are formed, and having an end region which includes at least one cutout; and
a back surface on a side opposite to the ejection port forming surface, which is arranged so as to be opposite to the substrate upper surface; and
a sealant configured to cover connecting portions between the electric wirings and the terminals,
wherein at least an ejection port region of the ejection port forming surface, in which the ejection ports are formed, is formed as a high water-repellency region,
wherein the end region of the ejection port forming surface, which is located between the ejection port region and the terminals when the substrate upper surface is viewed in plan view, is formed as a low water-repellency region having water repellency lower than water repellency of the high water-repellency region, and
wherein at least a part of the end region including the cutout is covered with the sealant,
wherein, when an opening width of the cutout on the ejection port forming surface is set to 2R and a depth of the cutout is set to D, the cutout is formed so as to satisfy:
2R>D.

### Claim 6 (depends on 5)

The liquid ejection head according to claim 5, wherein, when an opening width of the cutout on the ejection port forming surface is set to 2R, a density of the sealant is set to ρ, a surface tension of the sealant is set to σ, and a gravitational acceleration is set to g, the cutout is formed so as to satisfy:
2
3
⁢
π
⁢
⁢
R
⁢
⁢
ρ
⁢
⁢
g
>
σ
π
⁢
⁢
R
.

### Claim 7 (depends on 5)

The liquid ejection head according to claim 5,
wherein the ejection port forming member includes:
a top plate through which the ejection ports are formed; and
a flow passage member configured to communicate with the ejection ports and form a supply flow passage for the liquid, and
wherein the cutout is formed to pass through the top plate and the flow passage member.

### Claim 8 (depends on 5)

The liquid ejection head according to claim 5, wherein the sealant covers an entire surface of the end region.