Liquid ejection head and recording apparatus
A liquid ejection head including recording element substrates each including ejection opening rows in which ejection openings ejecting liquid are arranged, the plurality of ejection opening rows being juxtaposed in a relative movement direction with respect to the printed medium. In the relative movement direction of the printed medium when the printed medium is viewed from the liquid ejection head, and in the plurality of ejection opening rows provided in the recording element substrate, among the plurality of recording element substrates, positioned on an upstream side in the relative movement direction, arrangement intervals of ejection openings in an end area of an ejection opening row positioned on a most upstream side in the relative movement direction are smaller than arrangement intervals of ejection openings in an end area of an ejection opening row positioned on a most downstream side in the relative movement direction.
1. A liquid ejection head comprising:
recording element substrates that each include a plurality of ejection opening rows in which ejection openings that eject liquid on a printed medium are arranged, the plurality of ejection opening rows being arranged side by side in a relative movement direction with respect to the printed medium,
wherein in the relative movement direction of the printed medium when the printed medium is viewed from the liquid ejection head, and in the plurality of ejection opening rows provided in the recording element substrate, among the plurality of recording element substrates, positioned on an upstream side in the relative movement direction, arrangement intervals of ejection openings in an end portion area of an ejection opening row positioned on a most upstream side in the relative movement direction are smaller than arrangement intervals of ejection openings in an end portion area of an ejection opening row positioned on a most downstream side in the relative movement direction.
2. The liquid ejection head according to claim 1 ,
wherein the liquid ejection head is of a page wide type that includes the plurality of recording element substrates disposed in a zigzag manner.
3. The liquid ejection head according to claim 2 ,
wherein among the plurality of recording element substrates, arrangement intervals of ejection openings in an end portion area of an ejection opening row positioned upstream of a recording element substrate disposed downstream in the relative movement direction are smaller than arrangement intervals of ejection openings in an end portion area of an ejection opening row positioned downstream of a recording element substrate disposed upstream in the relative movement direction.
4. The liquid ejection head according to claim 2 ,
wherein in each of the recording element substrates disposed in the zigzag manner, arrangement intervals of ejection openings in an end portion area of an ejection opening row positioned on the most upstream side in the relative movement direction are smaller than arrangement intervals of ejection openings in an end portion area of an ejection opening row positioned on the most downstream side in the relative movement direction.
5. The liquid ejection head according to claim 1 ,
wherein arrangement intervals of ejection openings in an end portion area of an ejection opening row adjacent to the ejection opening row positioned on the most upstream side in the relative movement direction are smaller than arrangement intervals of ejection openings in an end portion area of an ejection opening row adjacent to the ejection opening row positioned on the most downstream side in the relative movement direction.
6. The liquid ejection head according to claim 1 ,
wherein arrangement intervals of ejection openings in an end portion area of an ejection opening row positioned on the most upstream side in the relative movement direction are smaller than arrangement intervals of ejection openings in an end portion area of an ejection opening row adjacent to the ejection opening row positioned on the most upstream side in the relative movement direction.
7. The liquid ejection head according to claim 1 ,
wherein in ejection opening rows used to perform recording among the plurality of ejection opening rows, arrangement intervals of ejection openings in an end portion area of an ejection opening row positioned on the most upstream side in the relative movement direction are smaller than arrangement intervals of ejection openings in an end portion area of another ejection opening row used to perform recording.
8. The liquid ejection head according to claim 1 ,
wherein in ejection opening rows used to perform recording among the plurality of ejection opening rows, arrangement intervals of ejection openings in an end portion area of an ejection opening row positioned on the most upstream side in the relative movement direction are smaller than arrangement intervals of ejection openings in an end portion area of a second ejection opening row, among other ejection opening rows used to perform recording, when counted downstream from the most upstream side in the relative movement direction.
9. The liquid ejection head according to claim 1 ,
wherein a volume of a single ejection of liquid ejected from the ejection openings is 10 picoliters or less.
10. The liquid ejection head according to claim 1 ,
wherein a speed of a relative movement in the relative movement direction is 0.4 m/s or more.
11. The liquid ejection head according to claim 1 ,
wherein a gap between an ejection opening surface in which the ejection openings are provided and the printed medium is 2 mm or less.
12. The liquid ejection head according to claim 1 ,
the recording element substrates each eject different types of liquid.
13. The liquid ejection head according to claim 1 ,
wherein arrangement intervals of the ejection openings included in the plurality of ejection opening rows are each 600 dpi or more.
14. The liquid ejection head according to claim 1 , further comprising:
an energy generating element that generates energy that ejects liquid; and
a pressure chamber including the energy generating element,
wherein the liquid in the pressure chamber is circulated to a portion external to the pressure chamber.
15. A recording apparatus comprising:
a liquid ejection head that ejects liquid on a printed medium; and
a conveying member that conveys the printed medium to the liquid ejection head,
wherein the liquid ejection head includes recording element substrates that each include a plurality of ejection opening rows in which ejection openings that eject the liquid on the printed medium are arranged, the plurality of ejection opening rows being arranged side by side in a relative movement direction with respect to the printed medium, and
wherein in the relative movement direction of the printed medium when the printed medium is viewed from the liquid ejection head, and in the plurality of ejection opening rows provided in the recording element substrate, among the plurality of recording element substrates, positioned on an upstream side in the relative movement direction, arrangement intervals of ejection openings in an end portion area of an ejection opening row positioned on a most upstream side in the relative movement direction are smaller than arrangement intervals of ejection openings in an end portion area of an ejection opening row positioned on a most downstream side in the relative movement direction.
16. The recording apparatus according to claim 15 ,
wherein the liquid ejection head is of a page wide type that includes the plurality of recording element substrates disposed in a zigzag manner.