Patent ID: 7445306

Claim:
A line-type ink-jet recording apparatus comprising: a conveyance mechanism that conveys a print medium; a passage unit provided with one or more common ink chambers that store ink and a plurality of individual ink passages each extending from an outlet of each common ink chamber through a pressure chamber to an ejection opening, the passage unit extending in a direction intersecting a conveyance direction for the print medium which is conveyed by the conveyance mechanism; a plurality of actuators that apply ejection energy to ink contained in respective pressure chambers so that the ink is ejected from ejection openings communicating with the pressure chambers; and an actuator controller that supplies an ejection signal to each of the actuators so that ink is ejected from n ejection openings communicating with the same common ink chambers at m different timings within one printing cycle and that ink is ejected from each of the n ejection openings at two or more different timings among the m timings within a printing period including two or more of the printing cycles, the printing cycle representing a time required for the print medium to be conveyed by a unit distance corresponding to a printing resolution with respect to the conveyance direction, wherein n is a natural number no less than 2 and m is a natural number no less than 2 and equal to or less than n, wherein a distance for the print medium to be conveyed within the printing period is a distance that corresponds to a spatial frequency of 5/mm or higher with respect to the conveyance direction.