Patent ID: 7637586

Claim:
An array type inkjet printer, comprising: a plurality of head chips, each comprising a plurality of nozzles; a print part which prints a plurality of test patterns of different forms; a scanning part which scans the plurality of printed test patterns; and a controller which controls the print part to print the plurality of test patterns using nozzles of interest from among the plurality of nozzles, and which determines the condition of the nozzles of interest with reference to a certain part of the scanned test patterns; wherein the plurality of test patterns comprises: a first test pattern comprising a plurality of vertical lines separated by a first constant interval; a second test pattern comprising a horizontal pattern and a vertical pattern, the horizontal pattern comprising a plurality of horizontal lines, and the vertical pattern formed below the horizontal pattern and comprising a plurality of vertical lines separated by a second constant interval, the combination of the horizontal pattern and the vertical pattern repeating as many times as a length of the second interval; and a third test pattern comprising a plurality of vertical lines separated by the first constant interval, and formed to a side of the second test pattern.