Patent ID: 9056459
Filing Date: 2015-06-16
Classification: B41J

Abstract:
1. An inkjet recording device comprising: a plurality of pressure-generating chambers compartmented by walls comprising electromechanical conversion devices for generating a pressure by deforming said walls by operating said electromechanical conversion devices; nozzles connected to the pressure-generating chambers for ejecting ink drops by operating the pressure; an ink supply portion for supplying an ink containing a pigment to said pressure-generating chambers; and a drive pulse generation device for driving said electromechanical conversion devices, wherein by separating said pressure-generating chambers into a plurality of groups, one group consisting of adjacent 3 pressure-generating chambers sandwiching said walls, said pressure-generating chambers in each group are driven in series so as to eject ink drops from said nozzles, wherein said drive pulse generation device ejects an ink drop from said nozzle by applying a first drive pulse for generating a negative pressure in said pressure-generating chamber on condition that the applying pressure on a meniscus in said nozzle is set within a range of −20 cmAq or more and −5 cmAq or less, and a second drive pulse for subsequently generating a positive pressure in said pressure-generating chamber to said electromechanical conversion device and the pulse width W1 of said first drive pulse is set within a range of 1.5AL≦W1<1.8AL on condition that AL is one half of the acoustic resonance of a pressure wave in said pressure-generating chamber.