To correct deviation of density highly precisely.
When a difference between a density of a test pattern of a solid image formed by a nozzle group 78A on an inlet side and a density of a test pattern of a solid image formed by a nozzle group 78B on an outlet side, both read by an optical sensor, is at least a threshold value, the adjustment amount of a drive voltage in an electric substrate 86A on the inlet side and a magnification of the drive voltage in an electric substrate 86B on the outlet side are determined so that the densities of the test patterns of the solid images formed by the nozzle group 78A on the inlet side and the nozzle group 78B on the outlet side, respectively, become target densities. When the difference between the density of the test pattern of the solid image formed by the nozzle group 78A on the inlet side and the density of the test pattern of the solid image formed by the nozzle group 78B on the outlet side read again by the optical sensor is at least the threshold value, a liquid flow rate adjusting means 84 is controlled so as to increase a flow rate to an ink outlet passage 80B.
Kato Kazunori
Katsuichi Nishimoto
Hiroshi Fukuda
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