Head substrate, printhead, head cartridge, and printing apparatus using the printhead or head cartridge

Abstract

Disclosed are a head substrate, a printhead, a head cartridge, and a printing apparatus using the printhead or head cartridge which are capable of separately measuring variations in the resistance of a printing element and variations in the parasitic resistance including the wiring resistance and the ON resistance of a driving element. For example, a head substrate having a plurality of printing elements and a plurality of driving elements for driving the plurality of printing elements includes the first terminal which receives a test signal to the plurality of printing elements, the second terminal which receives a selection signal for selecting and driving at least some of the plurality of printing elements, and the third and fourth terminals which output potentials at the two ends of each of the printing elements selected by the selection signal.

Dependencies are inferred from the claim text.