Image forming apparatus, and carrier, toner and developer...

Details Image forming apparatus, and carrier, toner and developer... Image forming apparatus, and carrier, toner and developer...

2006-12-07

2010-02-16

Royer, William J (Department: 2852)

Electrophotography

Image formation

Development

Reexamination Certificate

active

07664439

ABSTRACT:
An image forming apparatus including an image bearer, a magnetic field generator, a two-component developer bearer, a developing electric field generator, and an image developer. The two-component developer has at least a current speed index (25FRI) of from 0 to 2.0, which is determined by the following formula: 25FRI=(total energy at 10 mm/s/total energy at 100 mm/s). The total energy is an integral sum of a rotary torque and a vertical load when a blade of a powder fluidity analyzer spirally rotates at 10 mm/s and 100 mm/s, respectively, in the developer having a volume of 25 ml after idly agitated in the image developer for 10 minutes.

REFERENCES:
patent: 6503676 (2003-01-01), Yamashita et al.
patent: 7519316 (2009-04-01), Sato
patent: 2006/0024604 (2006-02-01), Sugiura et al.
patent: 07-199519 (1995-08-01), None
patent: 2000-122336 (2000-04-01), None
patent: 2002-244314 (2002-08-01), None
patent: 2002-351129 (2002-12-01), None

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