| 摘要 |
An ink-jet type image-forming apparatus is provided which is improved in ink ejection performance and ink ejection reliability by retarding increase of the ink viscosity. In this apparatus, the ink in nozzles is not heated immediately before the printing (no voltage pulse is applied to the heater 152) to retard the viscosity increase by evaporation of water from the ink; the interval between the succeeding ejections from the respective nozzle is estimated from the printing data; and plural voltage pulses P1 are applied to the heater 152 to a temperature so as not to cause ink ejection. Thereby the increase of the viscosity is retarded to improve the ink ejection performance and the ink ejection reliability
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