Patent ID: 7125105

Claim:
A semiconductor device for a liquid ejection head having a plurality of recording elements and driving elements provided correspondingly to every said recording element for driving the recording elements, said semiconductor device having at least a first wiring layer and a second wiring layer formed on a semiconductor substrate, wherein a segment is formed by a plurality of pairs of said recording element and said driving element, and a first wiring for mutually connecting and grounding first terminals of said driving elements arranged within the same segment is formed on said first wiring layer, wherein a second terminal of said driving element and the first terminal of said recording element are connected on one for one base, wherein a power source wiring is formed by said second wiring layer on the second terminal of said recording element so that the current is let flow into said recording element by a control signal inputted to a third terminal of said driving element, and wherein an auxiliary wiring for mutually connecting the second terminal of said recording element arranged within the same segment is formed by said first wiring layer.