Patent ID: 8851606

Claim:
An inkjet image recording apparatus with a recording head having a plurality of nozzles arranged transversely of a recording medium for discharging ink, the recording medium being transported relative to and in a direction perpendicular to a direction of arrangement of the nozzles, the apparatus correcting an ink discharge amount from each nozzle by detecting density of a chart formed by the recording head, the apparatus comprising: a chart printing device for printing the chart having, recorded therein, a density detecting pattern with a plurality of density areas arranged in the transport direction of the recording medium by discharging the ink from the nozzles toward the recording medium at a different discharge rate for each of the plurality of density areas, and position detecting marks formed in a particular one of the density areas by suspending discharge from particular nozzles selected from the plurality of nozzles; an imaging device for acquiring an image of the chart; and a discharge correcting device for correcting the ink discharge amount from each nozzle using image data of the chart acquired by the imaging device, wherein the chart printing device is configured such that the chart is printed with one pass of the recording medium being transported in the direction perpendicular to the direction of arrangement of the nozzles, and wherein the chart printing device is further configured such that the position detecting marks are being formed in the particular one of the density areas while the particular one of the density areas is being printed.