Liquid ejecting head, ejecting element substrate and liquid ejcting apparatus

Patent metadata

Field	Value
Publication number	US-2016339700-A1
Application number	US-201615155590-A
Country	US
Kind code	A1
Filing date	May 16, 2016
Priority date	May 22, 2015
Publication date	Nov 24, 2016
Grant date	—

Abstract

There are provided a liquid ejecting head, an ejecting element substrate and a liquid ejecting apparatus that can suppress degradation in print quality. Therefore in an ejecting element substrate arranged the closest to the center of a support member, a flow resistance of a flow passage corresponding to an ejection opening of an ejection opening array arranged the closest to the center of the ejecting element substrate is made high.

First claim

What is claimed is:

1 . A liquid ejecting head comprising:
a plurality of ejection openings for ejecting liquids;
flow passages communicated with the ejection openings; and
energy generating elements for generating energy used for ejection of the liquids from the ejection openings,
wherein the ejection opening closer to the center in an arrangement area where the ejection openings are arranged is communicated with the flow passage having the higher flow resistance.

2 . The liquid ejecting head according to claim 1 , wherein
a width of the flow passage is narrowed to reduce a cross-sectional area of the flow passage and increase a flow resistance of the flow passage.

3 . The liquid ejecting head according to claim 1 , wherein
the flow passage communicated with the ejection opening is communicated on one side with the ejection opening and on the other side with a common liquid chamber, and a connecting part between the common liquid chamber and the flow passage is provided with a filter.

4 . The liquid ejecting head according to claim 3 , wherein
the filter includes a columnar filter, and a diameter of the filter is changed to increase a flow resistance of the flow passage.

5 . The liquid ejecting head according to claim 3 , wherein
the filter includes a columnar filter, and a position of the filter is changed to increase a flow resistance of the flow passage.

6 . The liquid ejecting head according to claim 1 , wherein
a length of the flow passage is made long to increase the flow resistance of the flow passage.

7 . The liquid ejecting head according to claim 1 , wherein
the plurality of ejection openings form a plurality of ejection opening arrays lining up in a predetermined direction.

8 . The liquid ejecting head according to claim 7 , wherein
the ejection opening array closer to the center in a direction crossing the predetermined direction is provided with the ejection opening communicated with the flow passage having the higher flow resistance

9 . The liquid ejecting head according to claim 7 , wherein
the plurality of ejection opening arrays lining up in the predetermined direction are disposed on an ejecting element substrate, the ejecting element substrate includes odd numbers of ejection opening arrays, and flow passages corresponding to ejection openings provided in the ejection opening arrays other than the central ejection opening array have the same structure.

10 . The liquid ejecting head according to claim 9 , wherein
the plurality of ejection opening arrays closer to the center of the ejecting element substrate in a direction crossing the predetermined direction of the ejecting element substrate are formed of the ejection openings communicated with the flow passages having the higher flow resistance

11 . The liquid ejecting head according to claim 9 , wherein
the ejecting element substrate comprises a plurality of ejecting element substrates.

12 . An ejecting element substrate comprising:
a plurality of ejection openings for ejecting liquids;
flow passages communicated with the ejection openings; and
energy generating elements for generating energy used for ejection of the liquids, wherein
the ejection opening closer to the center in an arrangement area where the ejection openings are arranged is communicated with the flow passage having the higher flow resistance.

13 . A liquid ejecting apparatus provided with a liquid ejecting head comprising:
a plurality of ejection openings for ejecting liquids; flow passages communicated with the ejection openings; and energy generating elements for generating energy used for ejection of the liquids from the ejection openings, wherein in the liquid ejecting head, the ejection opening closer to the center in an arrangement area where the ejection openings are arranged is communicated with the flow passage having the higher flow resistance.

14 . A liquid ejecting head comprising:
heat generating element arrays that heat generating elements to generate heat energy that is used to eject a liquid are arranged in a predetermined direction; a pressure room that includes the heat generating elements therein; and a flow passage of which one end is communicated with the pressure room, and of which the other end is communicated with a common liquid chamber, wherein a flow resistance of the flow passage which is communicated with a heat generating element disposed in a central portion in the predetermined direction among the heat generating elements included in the heat generating element array is higher than a resistance of a flow passage communicated with a heat generating element disposed in an end portion.

15 . The liquid ejecting head according to claim 14 ,
comprising an element substrate on which the heat generating elements are formed, the element substrate having a plurality of the heat generating element arrays in parallel in a direction intersecting with the predetermined direction, wherein a flow resistance of flow channels included in the heat generating element array which is disposed in a central portion of the element substrate is higher than a flow resistance of flow channels contained in the heat generating element array arranged on an end side of the element substrate.

Assignees

• Canon Kk

Inventors

• Kodoi Takuma
• Tomizawa Keiji

Classifications

• B41J2/145

  Arrangement thereof · CPC title

• B41J2/1404

  Geometrical characteristics · CPC title

• B41J2/14112 Primary

  Resistive element · CPC title