Patent ID: 8113642

Claim:
A liquid ejection head comprising: a plurality of nozzles each including: an energy acting chamber; a print element located in the energy acting chamber to generate energy applied to a liquid stored in the energy acting chamber; an ejection port which communicates with the energy acting chamber and through which the liquid to which the energy is applied by the print element is ejected; and a liquid channel through which the liquid supplied via a liquid supply port and stored in the energy acting chamber passes, wherein a plurality of column-shaped nozzle filters are provided between the liquid supply port and the liquid channel to separate an impurity contained in the liquid, from the liquid, when a distance, in a direction from the liquid supply port toward the energy acting chamber, between the nozzle filter and a liquid channel inlet that is closest to the liquid supply port in the liquid channel is defined as L 1 , and a distance between the nozzle filters is defined as L 2 , a relationship between L 1 and L 2 satisfies L 1 ≦L 2 , wherein when volume of a bubble is maximum in the liquid which is present between the liquid channel inlet and the nozzle filter, (i) the volume of a part of the bubble which is grown in a direction in which a plurality of the nozzle filters are arranged, from the liquid channel inlet, is defined as V, (ii) a distance between adjacent liquid channel inlets is defined as L, and (iii) a distance, in an area between the liquid supply port and the liquid channel, from a surface of a substrate on which the print element is formed to a ceiling of the liquid channel is defined as H, and wherein L>(2V/(H×L 1 )) is satisfied.