Patent ID: 8292407

Claim:
A liquid-discharging-head substrate comprising: an element array in which a plurality of elements configured to generate energy for discharging liquid are arranged; a plurality of first individual lines respectively connected to the plurality of elements; a first common line commonly connected to the plurality of first individual lines; a plurality of second individual lines respectively connected to the plurality of elements; a second common line commonly connected to the plurality of second individual lines; and a surface on which the element array, the plurality of first individual lines, the first common line, the plurality of second individual lines, and the second common line are provided, wherein current flows to the elements via the first individual lines and the second individual lines by a potential difference between the first common line and the second common line so that the elements generate the energy, wherein, on the surface, the element array is provided in an area between the first common line and the second common line, the plurality of first individual lines are provided in an area between the element array and the first common line, and the plurality of second individual lines are provided in an area between the element array and the second common line, and wherein a plurality of supply ports configured to supply the liquid to the plurality of elements are respectively provided in at least one of a plurality of areas between the adjacent elements, a plurality of areas between the adjacent first individual lines, and a plurality of areas between the adjacent second individual lines.