Developing apparatus including a cylindrical developer...

Details Developing apparatus including a cylindrical developer... Developing apparatus including a cylindrical developer...

2007-02-05

2008-11-18

Chen, Sophia S (Department: 2852)

Electrophotography

Image formation

Development

C430S122510

Reexamination Certificate

active

07454160

ABSTRACT:
A developing apparatus, a process cartridge and an image forming apparatus which form an image whose image density can be maintained, which form a fogged image and which form an image of uneven density within an acceptable range, even when the diameter of a developer carrying member is not more than 12 mm. The apparatus includes a developer carrying member whose outer diameter is in the range of 8 mm to 12 mm, and a magnetic mono-component developer43having a saturation magnetization of in a range of 20 Am2/kg to 37 Am2/kg when the magnetic field of 79.6 kA/m (1000 oersteds) is applied, the magnetization of not less than 70% and not more than 80% of the saturation magnetization when the magnetic field is lowered to 55.7 kA/m (700 oersteds), and the magnetization of not less than 50% and not more than 62% of the saturation magnetization when the magnetic field is lowered to 39.8 kA/m (500 oersteds).

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