Image forming apparatus

Details Image forming apparatus Image forming apparatus

2007-03-30

2011-11-22

Le, Hoa (Department: 1721)

Electrophotography

Having particular structure

Modular or displaceable

C430S110100, C430S110300

Reexamination Certificate

active

08064796

ABSTRACT:
To provide an image forming apparatus which is able to improve image quality while suppressing soiling of image white parts, scattering in the apparatus, streaks, fading, etc. due to non-uniformity in the particle size distribution of a toner or mismatching between a toner and a photoreceptor, and which has good cleaning properties, and even when a high speed printing machine is used, is able to reduce a problem of soiling, etc. in long-term use and provide excellent image stability.An image forming apparatus comprising an electrophotographic photoreceptor having a photosensitive layer on an electroconductive substrate, and a toner for developing an electrostatic charge image, wherein the photosensitive layer of the electrophotographic photoreceptor contains a phthalocyanine obtained via an acid paste step; the toner for developing an electrostatic charge image is a toner for developing an electrostatic charge image containing toner matrix particles formed in an aqueous medium; the toner has a volume median diameter (Dv50) of from 4.0 μm to 7.0 μm; and the relationship between the volume median diameter (Dv50) and the percentage in number (Dns) of toner particles having a particle diameter of from 2.00 μm to 3.56 μm satisfies the following formula (1):in-line-formulae description="In-line Formulae" end="lead"?Dns≦0.233 EXP(17.3/Dv50)  (1).in-line-formulae description="In-line Formulae" end="tail"?

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