Ink jet print head substrate and ink jet print head

An ink jet print head substrate comprising:

• a substrate having a surface;
• a plurality of first energy generation elements configured to generate ejection energy used for ejecting ink droplet, and each of the first energy generation elements is provided so as to contact a pair of first electrodes, respectively;
• a first power supply line including a first conductive single layer, the first power supply line supplying a power voltage to the plurality of first energy generation elements and the first conductive single layer connecting to one electrode of each of plurality of pairs of first electrodes;
• a plurality of second ejection energy generation elements configured to generate ejection energy used for an ink droplet of a volume different from a volume of ink droplets ejected from the first ejection energy generation elements, each of the second energy generation elements being provided so as to contact a plurality of pairs of second electrodes;
• a second power supply line including a second conductive single layer, the second power supply line supplying a power voltage to the second ejection energy generation elements and the second conductive single layer connecting to one electrode of each of the plurality of pairs of second electrodes;
• and
• an insulating single layer made of an insulating material,
• wherein the second conductive single layer, the insulating single layer, and the first conductive single layer are laminated, in this order, on the surface of the substrate.