| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress a decrease in transfer efficiency due to an increase in charge amount of toner and a decrease in transfer efficiency due to an increase in aggregates of toner or an increase in a carrier amount during developing. <P>SOLUTION: A control part 1 of an image forming device 100 specifies the density of a developed image formed on a photoreceptor drum 21. The control part 1 also specifies the toner concentration in a developing device 24. And, the control part 1 specifies a transfer bias value corresponding to the density and concentration in a look-up table LUT2, based on the specified density of the developed image and the toner concentration. The control part 1 controls the power supply connected to a primary transfer roll 28 so that a transfer bias applied to the primary transfer roll 28 has the value. <P>COPYRIGHT: (C)2013,JPO&INPIT |
