Image forming apparatus having contact charger wtih superposed A

Details Image forming apparatus having contact charger wtih superposed A Image forming apparatus having contact charger wtih superposed A

1994-08-16

1996-04-16

Beatty, Robert

Photocopying

Contact printing

Light boxes

355219, G03G 2100

Patent

active

055087884

ABSTRACT:
An image forming apparatus including a contact charger for charging the surface of an image carrying body, a latent image forming unit for forming an electrostatic latent image on the charged image carrying body, a developing device for developing the latent image to form a visible image, a power source for applying a DC/AC superposed bias to the contact charger, a detector for detecting the current value of the superposed bias applied to the contact charger, and a device for controlling the AC:DC voltage ratio of the superposed bias applied to the contact charger, in accordance with a detected value from the detector. The AC bias is between 150 to 400 V while the DC bias is set between 500 to 800V.

REFERENCES:
patent: 4672505 (1987-06-01), Tsuchiya et al.
patent: 5144368 (1992-09-01), Ohzeki et al.
patent: 5229818 (1993-07-01), Nakahara et al.
patent: 5305177 (1994-04-01), Aoki et al.
patent: 5365316 (1994-11-01), Motoyama et al.
patent: 5420671 (1995-05-01), Kisu et al.

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