Image forming apparatus having a high voltage power source for a

Details Image forming apparatus having a high voltage power source for a Image forming apparatus having a high voltage power source for a

1991-09-11

1993-07-20

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355203, 355219, G03G 1500

Patent

active

052298183

ABSTRACT:
An image forming apparatus, which is capable of obtaining high quality images, having a recording member on which a latent image is formed, a charging voltage generating portion which is positioned in contact with the recording member for the purpose of applying charging voltage containing an AC component to the recording member and from which said charging voltage is supplied, an application device for applying an AC component having a frequency, which is different from that of the AC component of the charging voltage, to the recording member, an electric current value control circuit for detecting an output AC value of the charging voltage generating portion so as to make the output AC value to be a predetermined value, and an erroneous operation preventing circuit for preventing an erroneous operation of the electric current value control circuit taken place due to an introduction of the AC component applied by the application device into the charging voltage generating portion.

REFERENCES:
patent: 3604925 (1971-09-01), Snelling
patent: 3908164 (1975-09-01), Parker
patent: 4239373 (1980-12-01), Weikel, Jr.
patent: 4353970 (1982-10-01), Dryczynski
patent: 4435677 (1984-03-01), Thomas
patent: 4504139 (1985-03-01), Nozaki et al.
patent: 4783716 (1988-11-01), Nagase et al.
patent: 5006902 (1991-04-01), Araya

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