PRINTHEAD, PRINTHEAD SUBSTRATE, INK CARTRIDGE AND PRINTING APPARATUS HAVING PRINTHEAD

摘要

PROBLEM TO BE SOLVED: To provide a printhead capable of making current flowing through each printing element almost constant and stably printing at a high speed, a printhead substrate and ink cartridge and a printing apparatus having the printhead.;SOLUTION: The printhead includes a plurality of switching elements 102 which are arranged in correspondence with respective printing elements 101 and control current supply to the respective printing elements, a reference voltage circuit 105 which generates a reference voltage, a current generation circuit which generates a reference current Iref on the basis of a reference voltage Vref generated by the reference voltage circuit 105 and a plurality of constant current sources 103 which supply, in accordance with the reference current Iref generated by the current generation circuit, constant currents via the switching elements 102 arranged in accordance with the respective printing elements. The printhead substrate, ink cartridge and the printing apparatus having the printhead are also disclosed.;COPYRIGHT: (C)2005,JPO&NCIPI