IMAGE FORMING APPARATUS AND HEAD DRIVE CONTROL METHOD

摘要

A head drive control unit generates and outputs a pulse formed of a first expansion waveform element to expand individual liquid chambers, a first contraction waveform element to contract the individual liquid chambers, a second expansion waveform element to expand the individual liquid chambers, and a second contraction waveform element to return the individual liquid chambers that have repeatedly expanded and contracted to an initial state. The first contraction waveform element serves as a waveform element that contracts the individual liquid chambers at a timing of resonance with a change in a pressure in the individual liquid chambers due to the first expansion waveform element. The second contraction waveform element serves as a waveform element that suppresses the change in the pressure in the individual liquid chambers.

主权项

1. An image forming apparatus comprising:
a liquid ejection head that includes:
a plurality of nozzles for ejecting droplets;a plurality of individual liquid chambers communicating with the respective nozzles; anda pressure generating unit that generates a pressure to pressurize liquid in the individual liquid chambers; and a head drive control unit that generates a drive waveform including multiple pulses in chronological order, selects at least one of the pulses from the drive waveform according to a size of a droplet, and outputs the selected pulse to the pressure generating unit, wherein the head drive control unit generates and outputs a pulse formed of a first expansion waveform element to expand the individual liquid chambers, a first contraction waveform element to contract the individual liquid chambers, a second expansion waveform element to expand the individual liquid chambers, and a second contraction waveform element to return the individual liquid chambers that have repeatedly expanded and contracted to an initial state, the first contraction waveform element serves as a waveform element that contracts the individual liquid chambers at a timing of resonance with a change in a pressure in the individual liquid chambers due to the first expansion waveform element, and the second contraction waveform element serves as a waveform element that suppresses the change in the pressure in the individual liquid chambers.