DRIVE APPARATUS FOR LIQUID EJECTION HEAD, LIQUID EJECTION APPARATUS AND INKJET RECORDING APPARATUS

摘要

A drive apparatus for a liquid ejection head, includes a drive signal generating device for generating a drive signal to operate an ejection energy generating element provided so as to correspond to a nozzle of the liquid ejection head, the drive signal being supplied to the ejection energy generating element so that a liquid droplet is caused to be ejected from the nozzle, wherein: the drive signal includes a plurality of ejection pulses for performing a plurality of ejection operations during one recording period, in a remaining pulse sequence excluding a final pulse of the plurality of ejection pulses, a voltage amplitude of a subsequent pulse is smaller than a voltage amplitude of a preceding pulse, and the final pulse has a largest voltage amplitude, of the plurality of ejection pulses.

主权项

1. A drive apparatus for a liquid ejection head, the drive apparatus comprising a drive signal generating device configured to generate a drive signal to operate an ejection energy generating element provided so as to correspond to a pressure chamber connected to a nozzle of the liquid ejection head, the drive signal being supplied to the ejection energy generating element so that a liquid droplet is caused to be ejected from the nozzle, wherein:
the drive signal includes a plurality of ejection pulses configured to perform a plurality of ejection operations during one recording period; a remaining pulse sequence of the plurality of ejection pulses excluding a final pulse is configured in such a manner that, if the pulses in the remaining pulse sequence are extracted individually and compared in terms of ejection speeds produced by the respective pulses as obtained when used for single-shot ejection, then the ejection speeds produced by subsequent pulses in the remaining pulse sequence are slower than the ejection speeds produced by preceding pulses, and the final pulse causes ejection at a fastest ejection speed, compared with the ejection pulses preceding the final pulse in the remaining pulse sequence; the drive signal includes a reverberation suppressing pulse after the final pulse of the plurality of ejection pulses; the final pulse is combined with the reverberation suppressing pulse; and a potential difference in a signal element for compressing the pressure chamber to eject a final droplet by application of the final pulse is larger than a potential difference in a signal element of the final pulse for expanding the pressure chamber.