| 摘要 |
A developing apparatus is provided in which a replenishment developer when replenished has been electrified to a sufficient extent and can immediately produce an effect of replenishment, with a small consumption of a carrier. In an developing apparatus 100 of the present invention, by means of a first and a second agitation and conveyance screw 21, 22 arranged in an upper space 13 and a lower space 14 , respectively, a first two-component developer LT stored in the spaces is agitated and conveyed, so that it is supplied to a developing roller 20 so as to perform development processing of an electrostatic latent image on a photosensitive member. This developing apparatus replenishes a second two-component developer HT stored in a cartridge 30 into a first two-component developer LT in the spaces in an appropriate manner in accordance with the progress of the development process, so that a component composition of the first two-component developer can be kept within a prescribed range. In this case, amounts of electrification Q 1 , Q 2 of the first and second two-component developers are set to be Q 2 =Q 1 xA (A=0.6-1.5) when the second two-component developer is readjusted to the same state of its toner concentration as that of the first two-component developer.
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