Device and method for driving liquid discharge head, liquid discharge apparatus, and ink-jet apparatus

[0080]It is also possible to provide a configuration that adds a reverberation restraint pulse (which may be called a meniscus correction unit or a reverberation restraint unit) for restraining the reverberation of the meniscus after discharging just after the last jet pulse P3 in the basic driving waveform 30 illustrated in FIG. 2A. In this case, the reverberation restraint pulse can be added to the driving waveform for discharging each of the droplets of the small droplet, the medium droplet, and the large droplet.

[0081]By combining the reverberation restraint pulse, the discharge efficiency of the last pulse can be further improved, and the meniscus vibration (reverberation) after discharging one recording period can be reduced to be able to seek the stabilization of consecutive recording.

[0082]Although it is exemplified that the driving waveforms illustrated in FIGS. 2A to 2D are configured to draw the meniscus into the pressure chamber direction through making the pressure chamber expand by a rising portion of the pulse to raise the voltage in the plus direction from the reference potential, it is also possible to adopt a configuration which performs a “pulling” operation for drawing the meniscus through making the pressure chamber expand by a falling portion of the pulse that lowers the voltage from the reference potential, and performs a “pushing” operation through contracting the pressure chamber by a rising portion to raise the voltage from the lowered voltage.

[0083]Regarding Kinds of Droplet Sizes

[0084]Although it has been described that three kinds of droplets, that is, the small, medium, and large droplets, are provided, the kinds of droplets can be generalized as follows. That is, it is possible to perform discharge with different droplet quantities by selecti