Charging device and image forming apparatus having same

Details Charging device and image forming apparatus having same Charging device and image forming apparatus having same

1990-11-13

1992-09-01

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355271, 355274, 355276, G03G 1502

Patent

active

051443686

ABSTRACT:
A charging device includes a contact member contactable to a member to be charged; and a voltage applying device for applying to the contact member a voltage having a level which periodically changes, to charge the member to be charged; wherein the voltage applying device constant-voltage-controls the contact member in a first period and constant-current-controls the contact member in a second period, wherein a voltage level in the first period is determined in the second period.

REFERENCES:
patent: 4727453 (1988-02-01), Ewing
patent: 4851960 (1989-07-01), Nakamura et al.
patent: 4959688 (1990-09-01), Koitabashi
patent: 5006902 (1991-04-01), Araya
patent: 5034777 (1991-07-01), Ohzeki et al.

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