Patent ID: 9335659
Filing Date: 2016-05-10
CPC Classification: G03G

Claim Text:
1. An image forming apparatus comprising: a replenishment toner container which houses toner; and a development device which forms an image by using the toner supplied from the replenishment toner container, wherein at least two types of external additives are added to the toner, wherein, of the two types of external additives, when an added amount of a first external additive is Wh (volume % with respect to the toner) and an added amount of a second external additive is Wl (volume % with respect to the toner), a value of Wh+Wl in initial toner of a developer housed in the development device in advance is larger than a value of Wh+Wl in replenishment toner of a developer housed in the replenishment toner container; and wherein the fluidity of the replenishment toner is higher than the fluidity of the initial toner.