Charger for charging an image holding member included in an imag

Details Charger for charging an image holding member included in an imag Charger for charging an image holding member included in an imag

1994-08-17

1995-12-26

Royer, William J.

Photocopying

Contact printing

Light boxes

361221, G03G 1502

Patent

active

054792444

ABSTRACT:
When a resolution R (dpi) and a process speed (mm/sec) are determined, a voltage generating circuit 100 applies to a charging member a voltage consisting of an AC component having a frequency f which lies in a range having a maximum value and a minimum value determined by RS/25.4.+-.120 (Hz), and a DC component superimposed on the AC component. The DC voltage should only be 0.5 kV to 1.2 kV while the peak-to-peak voltage of the AC component is selected to be slightly higher than the DC voltage. The peak-to-peak voltage should be higher than a discharge start voltage; a sufficient discharge occurs when it ranges from 0.9 kV to 1.3 kV. In this configuration, not only clear-cut character images are printed without regard to changes in environment, but also mesh images are free from moire and vertical stripes.

REFERENCES:
patent: 5146281 (1992-09-01), Kisu
patent: 5245386 (1993-09-01), Asano et al.

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