Patent ID: 7980677

Claim:
An ink jet recording head comprising: a plurality of recording element substrates, each including at least one nozzle array having a plurality of nozzles for ejecting ink and heat generating resistors for ejecting the ink by thermal energy; a common liquid chamber having an ink introducing port for supplying the ink to the nozzles and a discharging port for discharging the introduced ink outside said ink jet recording head; and a supporting member on which said recording element substrates are mounted and in which a plurality of individual liquid chambers for supplying the ink to associated substrates of said recording element substrates and a plurality of ink inlet ports for supplying the ink from said common liquid chamber to associated chambers of the individual liquid chambers are formed, wherein the individual liquid chambers are arranged in a direction of flow of the ink flowing from the ink introducing port toward the discharging port, and wherein at least in a most upstream individual liquid chamber with respect to the ink flow direction, an ink flow passage length from an associated ink inlet port to a nozzle located upstream with respect to the ink flow direction is longer than an ink flow passage length from the associated ink inlet port to a nozzle located downstream with respect to the ink flow direction.