Corona charging of a charge retentive surface

Details Corona charging of a charge retentive surface Corona charging of a charge retentive surface

1997-05-19

1998-11-17

Grimley, Arthur T.

Electrophotography

Machine operation

Having power supply

250324, 361235, 399171, G03G 1502

Patent

active

058390243

ABSTRACT:
A corona charger for depositing an electrostatic charge on a charge retentive surface, without the creation of sheeting defects, the charger includes a coronode, and a power supply operating in cycles and providing in each of the cycles electrical power to the coronode to produce a net positive charging current with voltage to the coronode from the power supply operating in a portion of each cycle with a positive polarity to generate positive corona emissions. The power supply operates so that an AC component of the voltage provided by the power supply has a positive polarity in the range of about 60% to about 85% of each cycle. When operating in a broader range of greater than 50% but less than 100%, DC equivalent current to the coronode is controlled below a value causing sheeting.

REFERENCES:
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patent: 4166690 (1979-09-01), Bacon et al.
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patent: 4775915 (1988-10-01), Walgrove, III
patent: 4910400 (1990-03-01), Walgrove
patent: 5539501 (1996-07-01), Yu et al.
patent: 5642254 (1997-06-01), Benwood et al.

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