| 主权项 |
1. A liquid ejection apparatus comprising
a liquid ejection head including:
a plurality of ejection opening groups each constituted by two or more ejection openings and each configured to form one pixel by at least two liquid droplets ejected from the two or more ejection openings of a corresponding one of the plurality of ejection opening groups;a plurality of individual channels configured to respectively connect the plurality of ejection opening groups to a plurality of pressure chambers;a nozzle plate through which a plurality of nozzle holes, each having the two or more ejection openings at an end thereof, extend, each of the plurality of ejection opening groups comprising two ejection openings formed adjacent to each other; andan energy-applying portion configured to apply energy to liquid in the plurality of pressure chambers such that the liquid droplets are ejected from at least one ejection opening group selected among the plurality of ejection opening groups, and a controller configured to control the energy-applying portion, wherein the controller controls the energy-applying portion in such a manner as to meet the following inequations:0.85Ta≦T≦0.9Ta or 1.2Ta≦T in a case of p/D≦1.2, and0.85Ta≦T in a case of p/D>1.2,where p is a distance between respective centers of the two ejection openings of the ejection opening group, the two ejection openings being formed on an ejection surface of the nozzle plate, D is a diameter of an opening of each of the nozzle holes corresponding to the two ejection openings of the ejection opening group, the opening being formed on a surface opposite to the ejection surface of the nozzle plate, Ta is a resonance period of the individual channel, and T is an ejection period of ink droplets while one pixel is formed. |
