(57) Sedimentation of solid particles in an ink is affectively eliminated, and liquid
droplets can be stably ejected for a long time.
There is provided a liquid droplet ejection apparatus including: a head 1 that includes
an ink chamber, a nozzle 12 provided in accordance with the ink chamber, and an energy
giving device that gives energy to the ink in the ink chamber, the head performing
printing on a print region of a recording medium C by ejecting liquid droplets from
the nozzle 12; and a drive pulse generating device for generating, as the drive pulse,
an ejection pulse that is used for ejecting the liquid droplets from the nozzle 12
and a micro-vibration pulse that micro-vibrates the ink in the ink chamber so as not
to eject the liquid droplets from the nozzle 12, wherein the ink contains a dispersion
medium and solid particles having higher specific gravity than that of a dispersion
medium, and the liquid droplet ejection apparatus includes a refresh device for performing
a micro-vibration operation for applying the plurality of micro-vibration pulses when
the head is present in a non-print region, and an ejection operation for applying
the plurality of rejection pulses after the micro-vibration operation and ejecting
a liquid droplet amount equal to or greater than a capacity of the ink chamber from
the nozzle 12.
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