Patent ID: 6113209
Filing Date: 2000-09-05
Classification: B41J

Abstract:
A head driving device for an ink-jet head including a plurality of ink chambers and electrostrictive members, each electrostrictive member including a first electrode and a second electrode, said first and second electrodes forming a capacitance and varies pressure in a corresponding ink chamber by electrostriction caused upon charging and discharging of the capacitance, the head driving device comprising:a first power supply terminal and a second power supply terminal set at respective potentials different from each other; anda control circuit coupled to the first and second power supply terminals and to the first and second electrodes of each of the electrostrictive members for charging and discharging the capacitance of each of said electrostrictive members with use of the potentials of said first and said second power supply terminals; andwherein:said control circuit includes an integrated circuit chip having a semiconductor substrate and plural pairs of a first switching element and a second switching element, said first and second switching elements being formed in said semiconductor substrate,the first electrode of each electrostrictive member is connected to the first and second power supply terminals respectively through the first and second switching elements of one pair of said plural pairs of switching elements,the second electrode of each electrostrictive member is connected to said first and second power supply terminals respectively through the first and second switching elements of another pair of said plural pairs of switching elements, andsaid semiconductor substrate is set at a potential out of a range between the potentials of said first and said second power supply terminals.