Patent ID: 7114791
Filing Date: 2006-10-03
Classification: B41J

Abstract:
1. A head driving device of a liquid jetting apparatus, comprising: a driving element, respectively provided corresponding to plural nozzles from which a liquid droplet is jetted; a driving waveform generating circuit, generating a driving waveform to drive the driving element selectively at predetermined jetting timing; a current amplifying circuit, amplifying the driving waveform; and a current amplifying element, connected in parallel with an amplifying element of the current amplifying circuit, wherein the current amplifying element is operated when a current value of the current amplifying circuit exceeds a predetermined value, wherein a first driving waveform from the current amplifying circuit and a second driving waveform from the current amplifying element, are supplied to the driving element, wherein a resistor and a diode connected in series to each other are arranged between the current amplifying element and the driving element, and wherein a grounded capacitor is connected to a connection point between the resistor and the diode.