Patent ID: 7296869

Claim:
An ink jet recording head comprising: a plurality of discharge port arrays each comprising a plurality of discharge ports, each of the discharge port arrays corresponding to one or another of a plurality of types of ink whose viscosity decreases with a rise in temperature; recording elements to generate energy for discharging inks from the discharge ports of said discharge port arrays, the inks respectively corresponding to the discharge port arrays; and a recording element substrate provided with said discharge port arrays and said recording elements, the discharge port arrays corresponding to the most viscous of the inks to be discharged being arranged between other discharge port arrays on the recording element substrate, wherein a temperature reached by the discharge port arrays corresponding to the most viscous ink when said recording elements have caused all the discharge ports belonging to said plurality of discharge port arrays to discharge the inks at the same time is higher than a temperature reached by the discharge port arrays which are at ends of said plurality of discharge port arrays.