Patent ID: 7922316

Claim:
An inkjet recording apparatus comprising: an ink, and a recording head with a filter, wherein the ink that comprises a colorant, a humectant, a surfactant, and a wetting agent is discharged from the recording head, and the viscosity of the ink at 25° C. is 6 mPa·s to 13 mPa·s, the volume-average particle diameter of the colorant is 5 nm to 200 nm, and the fluid resistance of the filter against the ink is 4.4×10 9 Pa·s/m 3 to 2.2×10 10 Pa·s/m 3 wherein the fluid resistance (R) of a filter under a pressure (P) is obtained by R=PT/V where (V) is the volume of ink flowed for a time period (T), wherein the recording head comprises a nozzle and an ink-containing positively pressurized liquid chamber, and wherein the nozzle and the ink-containing positively pressurized liquid chamber are in direct fluid communication.