Liquid ejection head and method for ejecting liquids

A liquid ejection head comprising:

• a first ejection opening group in which a plurality of ejection openings that eject a first kind of liquid onto a print medium are arranged in a first direction;
• and
• a second ejection opening group including a plurality of ejection openings that are provided along the first ejection opening group to eject the first kind of liquid onto the print medium,
• wherein the first ejection opening group is provided upstream of the second ejection opening group with respect to a relative moving direction between the print medium and the liquid ejection head,
• the plurality of ejection openings included in the first ejection opening group are disposed in the first direction in a zigzag shape in which a distance along the relative moving direction between adjacent ejection openings is equal to or less than 1 ms×a speed of the relative moving,
• wherein a common liquid flow passage for supplying the liquid to the plurality of ejection openings extends in the first direction, and
• wherein the common liquid flow passage includes a first common liquid flow passage provided at one end side of the zigzag shape of the ejection openings in the first ejection opening group with respect to a second direction crossing the first direction, the second direction corresponding to the relative moving direction, a second common liquid flow passage provided at the other end side thereof, and a third common liquid flow passage provided along the first common liquid flow passage between the first common liquid flow passage and the second common liquid flow passage.