Electrophotography – Control of electrophotography process – Control of charging
Patent
1998-08-31
1999-08-03
Lee, S.
Electrophotography
Control of electrophotography process
Control of charging
399150, 399174, 399175, G03G 1502
Patent
active
059336811
ABSTRACT:
An image forming apparatus includes an image bearing member; a charging member, contactable to the image bearing member, for being supplied with a voltage to electrically charge the image bearing member, the charging member having a resistance which is larger when it is supplied with a voltage of 50V than when it is supplied with a voltage of 500V; developing device for developing with toner an electrostatic image formed on the image bearing member using charging operation of the charging member, the developing means being capable of removing the toner from the image bearing member; wherein the voltage is an oscillating voltage, and a ratio T.sub.up of time period when a voltage level thereof is in a side of a charging polarity of the charging member beyond an average voltage in one period of the oscillating voltage to a length of time of one period of the oscillating voltage, and a ratio T.sub.down of time period when the voltage level thereof is in a side of a polarity opposite from the charge polarity beyond the average voltage to the length of time of one period of the oscillating voltage, satisfy:
REFERENCES:
patent: 5305177 (1994-04-01), Aoki et al.
patent: 5835821 (1998-11-01), Suzuki et al.
patent: 5839026 (1998-11-01), Ko
patent: 5842081 (1998-11-01), Kaname et al.
Canon Kabushiki Kaisha
Lee S.
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