Method of achieving pure tone noise control in a system that emi

Details Method of achieving pure tone noise control in a system that emi Method of achieving pure tone noise control in a system that emi

1998-12-17

1999-12-21

Braun, Fred L.

Electrophotography

Internal machine environment

250324, G03G 1502

Patent

active

060060549

ABSTRACT:
A method of achieving pure tone noise control in a charging system of a copier/printer. The method includes the steps of first providing a plurality of individual charging devices and providing a plurality of power supplies for charging the plurality of individual charging devices. Next, charging at least one of the plurality of individual charging devices with a first of the plurality of power supplies at a predetermined frequency and charging at least one of the plurality of individual charging devices with a second of the plurality of power supplies at a frequency different from, but within a band width of, the predetermined frequency; and, lastly, charging at least one of the plurality of individual charging devices with a third of the plurality of power supplies at a frequency different from that of the first and second power supplies and within the band width of the first power supply frequency.

REFERENCES:
patent: 4908006 (1990-03-01), Burysek et al.
patent: 4908007 (1990-03-01), Henderson
patent: 5781829 (1998-07-01), Wong et al.
patent: 5784670 (1998-07-01), Sasahara et al.

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