Electrophotography – Supplemental electrophotographic process – Exposure or charging
Reexamination Certificate
2007-05-15
2007-05-15
Gray, David M. (Department: 2852)
Electrophotography
Supplemental electrophotographic process
Exposure or charging
C399S127000, C399S128000, C399S176000, C399S148000
Reexamination Certificate
active
11002208
ABSTRACT:
An image forming apparatus includes an image carrier, a charging device configured to uniformly charge a surface of the image carrier with a charging member applied with a bias of a first polarity (e.g. a negative polarity) for charging. A latent image forming device forms a latent image on the surface of the image carrier uniformly charged. A developing device develops a latent image by depositing toner grains of the first polarity on the latent image to thereby form a corresponding toner image. A transferring device forms an electric field between the image carrier and a moving member that serves as a movable contact with the image carrier to thereby transfer the toner image from the surface of the image carrier to the moving member or to a recording member nipped between the image carrier and the moving member. A polarity controlling device sets residual toner to a second polarity (e.g. a positive polarity) opposite to the first polarity, before the residual toner left on the image carrier by the transferring device is conveyed to a corresponding position to the charging member.
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Ariizumi Osamu
Enoki Shigekazu
Hatakeyama Kumiko
Kabata Toshiyuki
Kato Koichi
Gray David M.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ricoh & Company, Ltd.
Walsh Ryan D.
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