Charging device for an image forming apparatus

Details Charging device for an image forming apparatus Charging device for an image forming apparatus

1994-07-06

1996-01-09

Smith, Matthew S.

Photocopying

Contact printing

Light boxes

361225, G03G 1502

Patent

active

054833248

ABSTRACT:
In an electrophotographic image forming apparatus having an image carrier for forming an electrostatic latent image thereon, a charging device has a charging member facing the image carrier and spaced apart therefrom by a predetermined gap, and a power source for applying a predetermined voltage to the charging member. The device charges the image carrier without contacting it and is, therefore, advantageous over a conventional contact type charging device in respect of resistivity to smears, reliability and uniform charging. Moreover, since the charging device is operable with a voltage lower than a voltage conventionally applied to a corona charger, it causes a minimum of ozone to be produced while enhancing safety operation.

REFERENCES:
patent: 2934649 (1960-04-01), Walkup
patent: 3169886 (1965-02-01), Simm
patent: 4371252 (1983-02-01), Uchida et al.
patent: 4555171 (1985-11-01), Clouthier et al.
patent: 4819028 (1989-04-01), Abe
patent: 5196892 (1993-03-01), Mitsuaki
Nakamura et al., "The Mechanism of Charging Roller", N-94018, pp. 37-40 (Date unknown).

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