Image-forming apparatus, process cartridge and image-forming...

Details Image-forming apparatus, process cartridge and image-forming... Image-forming apparatus, process cartridge and image-forming...

2006-08-30

2009-02-10

Beatty, Robert (Department: 2852)

Electrophotography

Image formation

Development

C399S258000, C430S111400

Reexamination Certificate

active

07489891

ABSTRACT:
The present invention provides an image-forming apparatus containing an image bearing member, a latent electrostatic image forming unit, a developing unit, in which the developing unit contains an image developing unit, a developer supplying unit, and a developer container, the mass abundance ratio of the toner to the carrier is 80:20 to 95:5 in the developer container, the developer container contains a flexible pouched member which reduces its volume by reducing the internal pressure and a developer outlet to discharge the developer contained therein, the developer satisfies a relation of formula (1) where A denotes a percentage of voids calculated from a tap density of the toner and B denotes a degree of fluidity (sec/50g) of the developer at a toner coverage ratio of the carrier being 50%:in-line-formulae description="In-line Formulae" end="lead"?A≦0.01×B−0.2  (1).in-line-formulae description="In-line Formulae" end="tail"?

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