Patent ID: 7862157

Claim:
An ink jet recording head comprising: a plurality of ejection heat generating resistors for generating thermal energy for ejecting ink; a plurality of warming heat generating resistors for generating thermal energy for heating the ink; a plurality of ejection outlets, provided correspondingly to said plurality of ejection heat generating resistors, for ejecting the ink; and a recording element substrate provided with a plurality of ink flow paths provided correspondingly to said plurality of ejection outlets to supply the ink to said plurality of ejection outlets, said plurality of ejection heat generating resistors, said plurality of warming heat generating resistors, a first ejection outlet array portion including a plurality of said ejection outlets, and a second ejection outlet array portion including a plurality of said ejection outlets, wherein an amount of one ink droplet to be ejected from an ejection outlet of said first ejection outlet array portion is different from an amount of one ink droplet to be ejected from an ejection outlet of said second ejection outlet array portion, wherein said plurality of warming heat generating resistors is formed above said recording element substrate through said plurality of ejection heat generating resistors and an insulating layer with respect to a lamination direction of layers constituting said recording element substrate and is disposed between said plurality of ejection heat generating resistors and the plurality of ink flow paths, and wherein said plurality of warming heat generating resistors comprises a first warming heat generating resistor disposed at said first ejection outlet array portion with a larger ejection amount and a second warming heat generating resistor disposed at the second ejection outlet array portion with a smaller ejection amount.