Patent ID: 7896469

Claim:
A rectangular head substrate used in an inkjet printhead having a printing element array of printing elements which print by discharging ink, and a driving element array of driving elements which drive the printing elements, the head substrate comprising: a plurality of ink supply channels having a predetermined length along a longer side direction of the head substrate; a plurality of element arrays which are arranged on at least one side of each of the plurality of ink supply channels, and each of which has the printing element array and the driving element array; and a signal line which is provided along the longer side direction of the head substrate and transmits a signal to said plurality of element arrays, wherein said element arrays and said signal line are provided in an order named from the plurality of ink supply channels toward a longer side of the head substrate, plural pairs of the ink supply channels and said element arrays corresponding to the respective ink supply channels are arrayed in a staggered manner in the longer side direction of the head substrate, and another building element, of the head substrate, electrically connected to two adjacent element arrays is arranged in an area surrounded by said signal line and every other element array out of said plurality of element arrays arranged in the staggered manner.