Patent ID: 7828402

Claim:
A driving device of a recording head having a recording element, the driving device comprising: a driving circuit which drives a recording element; and a power supply device which supplies power to the driving circuit, wherein the driving circuit includes: an output circuit block which is supplied with the power from the power supply device, and amplifies and converts an input signal having a prescribed voltage waveform corresponding to recording data into a drive voltage applied to the recording element, the output circuit block having a structure in which a plurality of drive circuit units are connected in parallel to the recording element and respectively have transistors of which output terminals are connected to the recording element; a recording data integration device which determines an integrated value of a number of recording actions of the recording element according to the recording data; and a drive circuit unit selection device which selects at least one of the drive circuit units in accordance with the integrated value determined by the recording data integration device, in such a manner that an on-resistance value of the output circuit block which is a combined on-resistance of the transistors acting on the recording element is kept below a prescribed value.