A DRIVER CIRCUIT FOR DRIVING A PRINT HEAD OF AN INKJET PRINTER

摘要

The invention relates to an inkjet printing apparatus, comprising a print head, the print head comprising an ink duct, a piezoelectric element operatively coupled to the ink duct, and a control means for controlling an ink drop ejection from the ink duct by actuation of the piezoelectric element, the control means comprising a current source, a number of power supplies, and a switch, connected between the current source and the number of power supplies, characterized in that the current source is configured to generate a current for actuating the piezoelectric element by charging and discharging, and the switch is configured to connect the current source and one of said number of power supplies, said one of said number of power supplies being selected such that a lowest voltage difference over the current source exists.