Patent ID: 8075103

Claim:
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.