Developing apparatus using non-magnetic mono-component toner...

Details Developing apparatus using non-magnetic mono-component toner... Developing apparatus using non-magnetic mono-component toner...

2006-07-27

2009-10-27

Gray, David M (Department: 2852)

Electrophotography

Image formation

Development

C399S255000, C399S258000, C399S259000

Reexamination Certificate

active

07610001

ABSTRACT:
A developing apparatus includes an image receptor and a developing unit having a developing roller facing the image receptor. New toner can be added to the developing unit when existing toner in the developing unit is consumed. The added toner and existing toners are formed of cores and external additives. At least one of the cores or the external additives of the added toner is different from that of the existing toner. When the charge amount of the two toners are Q1and Q2, respectively, the ratio Q1/Q2is greater than 0.6 and smaller than 1.7, and the absolute values of Q1and Q2are 10 μC/g or greater, respectively.

REFERENCES:
patent: 1452021 (2003-10-01), None
patent: 09-127719 (1997-05-01), None
patent: 2002-006557 (2002-01-01), None
patent: 2002-268263 (2002-09-01), None
Electronic Translation of JP 2002268263, Yagi et al.

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