Liquid ejection head and liquid ejection apparatus

A liquid ejection head comprising:

• a first ejection nozzle array formed of a plurality of ejection nozzles arranged in a first direction;
• a second ejection nozzle array formed of a plurality of ejection nozzles arranged in the first direction, the second ejection nozzle array being aligned with the first ejection nozzle array in a second direction intersecting with the first direction;
• a plurality of first individual flow passages communicating with respective ejection nozzles of the plurality of ejection nozzles of the first ejection nozzle array and extending in the second direction;
• a plurality of second individual flow passages communicating with respective ejection nozzles of the plurality of ejection nozzles of the second ejection nozzle array and extending in the second direction;
• a plurality of first energy generating elements disposed at positions corresponding to respective ejection nozzles in the plurality of first individual flow passages and the plurality of second individual flow passages, the first energy generating elements configured to generate energy for ejecting liquid from the ejection nozzles;
• a plurality of second energy generating elements aligned with respective first energy generating elements in the second direction in the plurality of first individual flow passages and the plurality of second individual flow passages, the second energy generating elements configured to generate energy for causing liquid to flow;
• a first flow passage disposed on a side of the second ejection nozzle array opposite to the first ejection nozzle array in the second direction, the first flow passage configured to communicate with first ends of the plurality of first individual flow passages;
• a second flow passage disposed between the first ejection nozzle array and the second ejection nozzle array in the second direction, the second flow passage configured to communicate with second ends of the plurality of first individual flow passages and first ends of the plurality of second individual flow passages;
• a third flow passage disposed on a side of the first ejection nozzle array opposite to the second ejection nozzle array in the second direction, the third flow passage configured to communicate with second ends of the plurality of second individual flow passages;
• a plurality of first openings arranged in the first direction and disposed in the first flow passage, a first opening of the plurality of first openings configured for liquid to flow into or flow out of the first flow passage;
• a plurality of second openings arranged in the first direction and disposed in the second flow passage, a second opening of the plurality of second openings configured for liquid to flow into or flow out of the second flow passage;
• and
• a plurality of third openings arranged in the first direction and disposed in the third flow passage, a third opening of the plurality of third openings configured for liquid to flow into or flow out of the third flow passage;
• wherein:
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• with D1 being a size of a non-open part between two first openings adjacent to each other in the first direction, D2 being a size of a non-open part between two second openings adjacent to each other in the first direction, and D3 being a size of a non-open part between two third openings adjacent to each other in the first direction.