Patent ID: 7287832

Claim:
A printhead substrate having a plurality of ink supply channels disposed at predetermined intervals comprising: printing element arrays, each having a plurality of printing elements disposed in an area between two of the ink supply channels, alongside each of the ink supply channels; a plurality of driving circuit arrays, each provided along respective one of the printing element arrays, for individually driving the printing elements of the printing element arrays; a drive control circuit, disposed outside the area, for controlling the driving of the printing element arrays, each of the printing element arrays provided along respective one of the two of the ink supply channels; a shared wiring portion, disposed in the area and elongated in a direction of a length of the printing element arrays, for providing a shared signal making each of the printing elements of the two printing element arrays provided corresponding to two adjacent ink supply channels of the plurality of ink supply channels drivable; first wirings dedicated to one of the plurality of driving circuit arrays provided corresponding to one of two adjacent ink supply channels, the first wirings extending from the shared wiring portion to the one of the plurality of driving circuit arrays; and second wirings dedicated to another one of the plurality of driving circuit arrays provided corresponding to the other of the two adjacent ink supply channels, the second wirings extending from the shared wiring portion to the other one of the plurality of driving circuit arrays.