Electrophotography – Control of electrophotography process – Control of charging
Reexamination Certificate
2005-01-21
2008-09-02
Gray, David M. (Department: 2852)
Electrophotography
Control of electrophotography process
Control of charging
C399S100000, C399S173000
Reexamination Certificate
active
07421222
ABSTRACT:
In a charging device having saw-tooth electrodes for generating corona discharges, an amount of dust, toner, or paper dust attached to the tip end portions of saw-tooth electrodes is reduced. First to third pairs of saw-tooth electrode plates are disposed in a side-by-side fashion along the periphery of a photosensitive drum in which the first pair is disposed at an upstream side with respect to a direction in which the photosensitive drum rotates, the third pair at a downstream side, and the second pair at a central portion between the remaining two. A current flowing per a unit length of the second pair is set to 1.3 to 3 times as much as a current flowing per a unit length of each of the first and third pairs. The currents flowing per a unit length of the first and third pairs are set to be equal to each other.
REFERENCES:
patent: 3862420 (1975-01-01), Banks et al.
patent: 5781829 (1998-07-01), Wong et al.
patent: 6025594 (2000-02-01), Bryce et al.
patent: 63-15272 (1988-01-01), None
Kubo Tatsuya
Otome Yukio
Tsujita Akio
Gray David M.
Ricoh Printing Systems Ltd.
Roth Laura K
Whitham Curtis Christofferson & Cook, P.C.
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