| 摘要 |
An ink jet head is provided with a plurality of nozzle arrays (102) formed by many numbers of ink nozzles (101) for discharging large-amount ink droplets (D-L) and small-amount ink droplets (D-S). Although the ink jet head generates heat more on the middle portion thereof, it is cooled by discharges of ink droplets. The degree of cooling is greater by the large-amount ink droplets to be discharged. Thus, on the first column in the main scan direction, the small-amount nozzle array (102-S) is positioned, and on the second column, the large-amount nozzle array (102-L) is positioned. In this way, it is made possible to balance the temperature distributions in the main scan direction. As a result, color images can be formed in high quality. <IMAGE> |
