Image forming apparatus

Details Image forming apparatus Image forming apparatus

2006-10-17

2006-10-17

Chapman, Mark A. (Department: 1756)

Electrophotography

Image formation

Development

C399S252000, C430S122520, C430S120400, C430S106200, C430S110400, C430S045320

Reexamination Certificate

active

07123862

ABSTRACT:
In an image forming apparatus having at least an amorphous silicon photosensitive member, a magnetic toner developing means and a color developer developing means, the magnetic toner has a weight-average particle diameter (D4) of from 4.0 μm to 10.0 μm and a ratio thereof to number-average particle diameter (D1), D4/D1, of from 1.0 to 2.0, and the number of magnetic particles not passing through a mesh with an opening of 34 μm which are contained in the unit volume of the magnetic toner is from 3.5 to 105. This image forming apparatus can not easily cause faulty cleaning performance even in using the magnetic toner and the non-magnetic color toners in combination and has superior environmental stability and running stability even where toners made to have small particle diameter are used or process speed is high.

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