In a printhead in which a plurality of printing elements arranged in a predetermined direction and a driving circuit for driving the printing elements are formed on a single substrate, the printing elements are classified into a plurality of groups. A selection circuit for selecting a printing element...http://www.google.de/patents/US7321444?utm_source=gb-gplus-sharePatent US7321444 - Printhead, head cartridge having the printhead, printing apparatus using the printhead, and printhead element substrate
