Image forming device having an alternating current frequency...

Details Image forming device having an alternating current frequency... Image forming device having an alternating current frequency...

2005-10-27

2008-10-14

Gray, David M. (Department: 2852)

Electrophotography

Control of electrophotography process

Control of charging

C399S089000

Reexamination Certificate

active

07437089

ABSTRACT:
The size of a resonance noise due to a signal of an alternating voltage applied to a charging member (charging roller) is detected by a piezoelectric device (PZ), and in cases in which the size of the detected resonance noise (detection signal level) exceeds a predetermined size, the frequency of the alternating voltage signal applied to the charging member is shifted, by a control unit (50), by a predetermined frequency amount only.

REFERENCES:
patent: 2002207352 (2002-07-01), None

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