Discharge element substrate, printhead, and printing apparatus

A discharge element substrate comprising:

• a plurality of discharge elements each including a first electrical contact and a second electrical contact;
• a plurality of driving circuits arranged in a first direction and each connected to corresponding one of the plurality of discharge elements;
• a power supply electrode extending in the first direction;
• a plurality of driving wiring lines each extending in a second direction that intersects with the first direction and configured to connect one of the plurality of driving circuits and the first electrical contact of one of the plurality of discharge elements;
• and
• a plurality of power supply wiring lines extending in the second direction and each configured to connect the power supply electrode and the second electrical contacts of the plurality of discharge elements,
• wherein the plurality of discharge elements and the plurality of driving circuits form a plurality of groups each including at least one of a first discharge element, a first driving circuit connected to the first discharge element, a second discharge element, a second driving circuit connected to the second discharge element, and the plurality of power supply wiring lines,
• in each of the plurality of groups, a first distance from the first driving circuit to the first discharge element in the second direction is shorter than a second distance from the second driving circuit to the second discharge element in the second direction, and a length, in the second direction, of the driving wiring line connecting the first driving circuit and the first electrical contact of the first discharge element is shorter than a length, in the second direction, of the driving wiring line connecting the second driving circuit and the first electrical contact of the second discharge element,
• in each of the plurality of groups, a first end of the power supply wiring line is connected to the power supply electrode and a second end of the power supply and the second end of the power supply wiring line is connected to the second electrical contact of the second discharge element,
• in each of the plurality of groups, the power supply wiring line includes a portion that branches from the second electrical contact, and
• in each of the plurality of groups, one end of the branched portion is connected to the second electrical contact of the first discharge element.