Liquid ejection head

Patent metadata

Field	Value
Publication number	US-9102149-B2
Application number	US-201414310400-A
Country	US
Kind code	B2
Filing date	Jun 20, 2014
Priority date	Jun 28, 2013
Publication date	Aug 11, 2015
Grant date	Aug 11, 2015

Abstract

A liquid ejection head is provided with a recording element substrate having a plurality of ejection orifices for ejecting a liquid, the plurality of ejection orifices being arranged to form a row of the ejection orifices. In at least some of the plurality of the ejection orifices, each having one side and another side, the area of an inner wall of the ejection orifices is set to be larger on the other side than on the one side, the one side and the other side being defined by a plane which passes through the center of the ejection orifice, intersects with the row of the ejection orifices at right angles and extends along the direction of the depth of the ejection orifice.

First claim

The invention claimed is:

1. A liquid ejection head comprising:
a recording element substrate which has a plurality of ejection orifices for ejecting a liquid,
wherein the plurality of the ejection orifices are arranged to form a row of the ejection orifices, and
in at least some of the plurality of the ejection orifices, each having one side and another side, the area of an inner wall of each of the ejection orifices is set to be larger on the other side than on the one side, the one side and the other side being defined by a plane which passes through the center of the ejection orifice, intersects with the row of the ejection orifices at right angles, and extends along the direction of the depth of the ejection orifice.

2. The liquid ejection head according to claim 1 , wherein, in at least some of the plurality of the ejection orifices, at least one projection is provided on the other side of the inner wall.

3. The liquid ejection head according to claim 1 , wherein the plurality of the ejection orifices are symmetrical relative to an axis which passes through the center of the ejection orifice and which is parallel to the row of the ejection orifices, as observed from a surface of the recording element substrate in which the plurality of the ejection orifices are formed.

4. The liquid ejection head according to claim 1 , wherein the one side is a side closer to the center of the row of the ejection orifices and a difference between the area of the inner wall on the one side of the ejection orifice and the area of the inner wall on the other side thereof increases toward an ejection orifice on an end of the row of the ejection orifices from an ejection orifice at the center of the row of the ejection orifices.

5. The liquid ejection head according to claim 1 , wherein the section of the ejection orifice in the direction along a front surface of the recording element substrate has a polygonal shape.

6. The liquid ejection head according to claim 1 , wherein the ejection orifices open at the surface of an ejection orifice member, deviation of impact positions of a liquid ejected from the ejection orifices caused by telecentricity is controlled by difference between the area of the ejection orifice on the one side and the area of the ejection orifice on the other side.

7. A method for manufacturing a liquid ejection head comprising a recording element substrate which has a row of ejection orifices formed of a plurality of ejection orifices for ejecting a liquid, the method comprising the steps of:
applying a negative type photosensitive resin on the substrate and a mold material; and
exposing the negative type photosensitive resin by using a mask in which a plurality of covered portions are arranged to prevent the exposure of the portions that will become the plurality of the ejection orifices, each having one side and another side, and the inner periphery of each of the covered portions is set to be larger on the other side than on the one side, which sides are defined by an axis that passes through the center of the covered portion and orthogonally intersects with the row of the plurality of the covered portions, and carrying out post exposure bake and development thereby to form the row of the ejection orifices.

8. The method for manufacturing a liquid ejection head according to claim 7 , wherein the exposure is a reduced projection exposure.

Assignees

• Canon Kk

Inventors

• Nagai Masataka
• Tagawa Yoshinori
• Kurosu Toshiaki
• Murayama Hiroyuki
• Watanabe Makoto
• MANABE Takanobu

Classifications

• Y10T29/49401

  Fluid pattern dispersing device making, e.g., ink jet · CPC title

• B41J2002/14475

  characterised by nozzle shapes or number of orifices per chamber · CPC title

• B41J2202/03

  Specific materials used · CPC title

• B41J2/1433 Primary

  Structure of nozzle plates · CPC title

• B41J2002/14387

  Front shooter · CPC title