Image forming apparatus

Details Image forming apparatus Image forming apparatus

2006-04-18

2006-04-18

Hirshfeld, Andrew H. (Department: 2854)

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

C347S253000

Reexamination Certificate

active

07030895

ABSTRACT:
There is provided a photoreceptor cleanerless image forming apparatus capable of decreasing color mixture or an exposure error due to reverse transfer toner or untransferred toner.An image forming apparatus100according to the present invention comprises four image forming units100a, 100b, 100c, and100dconfigured to be photoreceptor cleanerless in a 4-drum tandem manner. Each image forming unit includes a photoreceptor103a, 103b, 103c, or103d, a charger105a, 105b, 105c, or105d, an exposure apparatus106a, 106b, 106c, or106d, and a developing apparatus109a, 109b, 109c, or109d. When exposure intensities Iy, Ic, Im, and Ik are assumed for exposure sources of the exposure apparatuses in the image forming units which form yellow, magenta, cyan, and black images, respectively, the exposure intensities are configured to satisfy conditions of Ik≧Ic≧Im≧Iy and Ik>Iy. This decreases an exposure error (image hysteresis) in an image formed on paper.

REFERENCES:
patent: 6240269 (2001-05-01), Kaya et al.
patent: 6564021 (2003-05-01), Nakai et al.
patent: 5-341643 (1993-12-01), None
patent: 8-146696 (1996-06-01), None
patent: 11-24354 (1999-01-01), None

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