Patent ID: 8721016

Claim:
An apparatus for driving a multi-nozzle piezo-inkjet head based on a digital grayscale, the apparatus comprising: a control unit providing a pulse data signal having at least one pulse waveform according to graphic image data, controlling a voltage variation according to a frequency response characteristic of the multi-nozzle piezo inkjet head, and controlling a voltage amplification, so as to eject droplets of ink at a previously set jetting frequency according to the graphic image data; a variable voltage supply unit generating a varied operating voltage by varying a level of a previously set direct current voltage according to the pulse data signal of the control unit; and an amplification circuit unit generating a voltage driving waveform including at least one pulse waveform having the level of the varied operating voltage according to a voltage amplification control of the control unit, and supplying the voltage driving waveform to the multi-nozzle piezo inkjet head.