Patent ID: 6631970
Filing Date: 2003-10-14
Classification: B41J

Abstract:
An ink jet recording apparatus having an ink jet print head board mounted on an ink jet print head, the ink jet print head ejecting a conductive ink from ejection ports to perform printing, the ink jet print head board comprising:print elements for supplying energy to eject the ink; drive elements for driving the print elements; an insulating protective film formed to cover wires connecting the print elements and the drive elements; a detection electrode capable of detecting, through the ink on the ink jet print head board, an electric potential between signal sources and the drive elements, said signal sources being for signals generated according to the driving of the print elements, and said signals being generated through said insulating protective film; periodical drive means for driving the print elements at a predetermined drive frequency; voltage detection means for periodically detecting an output voltage of the detection electrode at a timing corresponding to the drive frequency; and state check means for checking a state of the ink jet print head according to a result of the detection by the voltage detection means.