Recording head and inkjet recording apparatus

Patent metadata

Field	Value
Publication number	US-10022980-B2
Application number	US-201715661947-A
Country	US
Kind code	B2
Filing date	Jul 27, 2017
Priority date	Jul 29, 2016
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

A discharge port array unit including discharge ports having a small discharge port diameter is not arranged in a position adjacent to a discharge port array unit generating a strong airflow, and a discharge port array unit including discharge port array having not a small discharge port diameter is arranged in the position adjacent to the discharge port array unit generating a strong airflow.

First claim

What is claimed is:

1. A recording head comprising:
a plurality of discharge port array units each including at least one of a first discharge port array in which discharge ports having a first diameter as a discharge port diameter are arranged in a predetermined direction, a second discharge port array in which discharge ports having a second diameter smaller than the first diameter as a discharge port diameter are arranged in the predetermined direction, and a third discharge port array in which discharge ports having a third diameter smaller than the second diameter as a discharge port diameter are arranged in the predetermined direction, the plurality of discharge port array units including a first discharge port array unit configured to discharge ink of a first color, a second discharge port array unit configured to discharge ink of a second color, and a third discharge port array unit configured to discharge ink of a third color, the plurality of discharge port array units being juxtaposed in a crossing direction crossing the predetermined direction,
wherein the first discharge port array unit includes N first discharge port arrays and does not include the second or third discharge port array, where N is equal to 2 or more,
wherein the second discharge port array unit does not include N or more first discharge port arrays, includes the second discharge port array, and does not include the third discharge port array,
wherein the third discharge port array unit includes the third discharge port array, and
wherein the third discharge port array unit is not adjacent to the first discharge port array unit in the crossing direction, and the second discharge port array unit is adjacent to the first discharge port array unit in the crossing direction.

2. The recording head according to claim 1 , wherein the first color is yellow, the second color is black, and the third color is either cyan or magenta.

3. The recording head according to claim 2 , wherein the recording head includes only one first discharge port array unit among the plurality of discharge port array units.

4. The recording head according to claim 3 ,
wherein the recording head includes only two third discharge port array units among the plurality of discharge port array units, and
wherein the first discharge port array unit and the second discharge port array unit are arranged between the two third discharge port array units.

5. The recording head according to claim 4 ,
wherein the recording head includes only two fourth discharge port array units configured to discharge ink of a fourth color among the plurality of discharge port array units, and
wherein the first discharge port array unit, the second discharge port array unit, and the two third discharge port array units are arranged between the two fourth discharge port array units.

6. The recording head according to claim 5 , wherein the fourth discharge port array units include the third discharge port array.

7. The recording head according to claim 6 , wherein the fourth color is the other of cyan and magenta.

8. The recording head according to claim 7 ,
wherein the recording head includes only two second discharge port array units among the plurality of discharge port array units, and
wherein one of the two second discharge port array units is adjacent to one side of the first discharge port array unit, and
wherein the other of the two second discharge port array units is adjacent to the other side of the first discharge port array unit.

9. The recording head according to claim 1 ,
wherein the first discharge port array unit consists of two first discharge port arrays,
wherein the second discharge port array unit consists of two discharge port arrays including one second discharge port array and one first discharge port array, and
wherein the third discharge port array unit consists of two discharge port arrays including one third discharge port array and one second discharge port array.

10. The recording head according to claim 1 ,
wherein the first discharge port array unit consists of two first discharge port arrays,
wherein the second discharge port array unit consists of two discharge port arrays including one second discharge port array and one first discharge port array, and
wherein the third discharge port array unit consists of three discharge port arrays including one third discharge port array, one second discharge port array, and one first discharge port array.

11. The recording head according to claim 1 ,
wherein the plurality of discharge port array units includes a fifth discharge port array unit configured to discharge ink of a fifth color, and
wherein each of one second discharge port array unit and one third discharge port array unit is adjacent to a different side among sides of the fifth discharge port array unit.

12. The recording head according to claim 11 , wherein the fifth color is any one of gray, red, green, and blue.

13. The recording head according to claim 1 , wherein each of the plurality of discharge port array units includes an ink chamber.

14. The recording head according to claim 1 , wherein the plurality of discharge port array units is provided on a chip.

15. The recording head according to claim 1 , wherein the plurality of discharge port array units is provided on a same nozzle plate.

16. The recording head according to claim 1 , wherein discharge port arrays configured to discharge ink of a same color in each of the plurality of discharge port array units have no discharge port array configured to discharge ink of color other than the same color therebetween in the crossing direction.

17. The recording head according to claim 1 , wherein when a tone lower than a predetermined tone among tones lying on a line from white to black through gray is reproduced, the second discharge port array unit performs no discharge and the first and third discharge port array units perform a discharge.

18. An inkjet recording apparatus comprising:
a recording head including a plurality of discharge port array units each including at least one of a first discharge port array in which discharge ports having a first diameter as a discharge port diameter are arranged in a predetermined direction, a second discharge port array in which discharge ports having a second diameter smaller than the first diameter as a discharge port diameter are arranged in the predetermined direction, and a third discharge port array in which discharge ports having a third diameter smaller than the second diameter as a discharge port diameter are arranged in the predetermined direction, the plurality of discharge port array units including a first discharge port array unit configured to discharge ink of a first color, a second discharge port array unit configured to discharge ink of a second color, and a third discharge port array unit configured to discharge ink of a third color, the plurality of discharge port array units being juxtaposed in a crossing direction crossing the predetermined direction; and
a control unit configured to perform control of a recording operation in which the recording head discharges ink to record an image,
wherein the first discharge port array unit includes N first discharge port arrays and does not include the second or third discharge port array, where N is equal to 2 or more,
wherein the second discharge port array unit does not include N or more first discharge port arrays, includes the second discharge port array, and does not include the third discharge port array,
wherein the thi

Assignees

• Canon Kk

Inventors

• Tanaka Hirokazu
• Suzuki Fumiko
• Doi Tsukasa

Classifications

• B41J19/147

  Colour shift prevention · CPC title

• B41J2/2103 Primary

  Features not dealing with the colouring process per se, e.g. construction of printers or heads, driving circuit adaptations · CPC title

• B41J2/145

  Arrangement thereof · CPC title

• B41J2/2125 Primary

  by means of nozzle diameter selection · CPC title