Power supply for hybrid scavengeless development type image...

Details Power supply for hybrid scavengeless development type image... Power supply for hybrid scavengeless development type image...

2007-01-30

2007-01-30

Royer, William J. (Department: 2852)

Electrophotography

Machine operation

Having power supply

C399S266000

Reexamination Certificate

active

10761209

ABSTRACT:
A power supply for a hybrid scavengeless development (HSD) image forming system which generates three voltages, a mag voltage, a donor voltage and a wire electrode voltage. The power supply outputs square waveforms for generating toner clouds to maximize the voltage push-pull on toner without increasing peak voltage level. The power supply also generates asymmetric waveforms for mag AC, donor AC and electrode wire voltage signals to avoid air breakdown at a wire electrode to donor interface while allowing maximum use of a voltage space. Finally, the power supply uses frequency modulation of the AC signals to suppress harmonic strobing of electrode wires.

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patent: 2003/0185598 (2003-10-01), Folkins et al.
patent: 0 533 347 (1993-03-01), None
European Search Report.

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