Patent ID: 7614726

Claim:
A recording head substrate comprising: first and second groups of recording elements arranged in respective arrays; first and second input contacts for receiving driving pulse signals; first and second signal lines for supplying the driving pulse signals to said first and second groups of recording elements from said first and second input contacts, respectively; wherein said first group of said recording elements includes a first set of recording elements and a second set of recording elements, and said second group of said recording elements includes a first set of recording elements and a second set of recording elements, wherein said recording elements in said first set of said first group are adjacent to each other, and said recording elements in said first set of said second group are adjacent to each other, wherein said recording elements in said second set of said first group and said recording elements in said second set of said second group are disposed alternately, and wherein a number of said recording elements in said second set of said second group is not more than one half a number of recording elements in said first set of said second group.