Patent ID: 7824014

Claim:
A head substrate used in an inkjet printhead, comprising: an ink supply channel which is arranged along a longer side direction of the head substrate; a plurality of printing element arrays which are arranged on at least one side of said ink supply channel, and each of which has a plurality of printing elements for printing by discharging ink supplied from the said ink supply channel; a plurality of driving element arrays which are arranged adjacent to said plurality of printing element arrays on the same side of said ink supply channel as the side on which said plurality of printing element arrays are arranged, and which have a plurality of driving elements for driving the plurality of printing elements forming said plurality of printing element arrays; a plurality of power supply pads which are arranged in plural areas between said plurality of driving element arrays along the longer side direction of the head substrate, and supply power to the plurality of printing elements of neighboring printing element arrays out of said plurality of printing element arrays; and a plurality of ground pads which are arranged in the areas and correspond to said plurality of power supply pads.