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US 4,230,783 AGranted
Process and apparatus for electrophotography
AssigneeCanon Kabushiki Kaisha
InventorsTakao Aoki, Hidejiro Kadowaki, Naoki Iwami
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AssigneeCanon Kabushiki Kaisha
InventorsTakao Aoki, Hidejiro Kadowaki, Naoki Iwami
Estimating the term…
Process and apparatus for electrophotography are disclosed in which a photosensitive medium basically composed of an electrically conductive layer, a photoconductive layer and an insulating layer is used. The process comprises the steps of applying onto the surface of the photosensitive medium a uniform corona discharge with a predetermined polarity, exposing it to an original light image, applying to it a secondary corona discharge with a component of the opposite polarity to that of the primary uniform corona discharge simultaneously with or immediately after the image-wise exposure, uniformly exposing it to near infrared light almost simultaneously with the secondary corona discharge and subjecting it to a whole surface exposure with white light so as to form an electrostatic latent image corresponding to the original light image. Apparatus for carrying out the electrophotographic process comprises the above mentioned type of photosensitive medium, means for exposing the photosensitive medium to a light image, means for forming an electrostatic latent image on it in accordance with the image-wise exposure by said exposure means, near infrared exposure means for exposing it to light of near infrared range and developing means.
A process of electrophotography employing a photosensitive medium basically composed of an insulating top layer, an electrically conductive base layer, and a photoconductive layer therebetween, said process comprising the steps of:
A process of electrophotography employing a photosensitive medium basically composed of an insulating top surface layer, an electrically conductive base layer, and a photoconductive layer therebetween, said process comprising the steps of:
A process of electrophotography employing a photosensitive medium basically composed of an insulating top surface layer, an electrically conductive base layer, and a photoconductive layer therebetween, said process comprising the steps of:
Dependencies are inferred from the claim text.