Photosensitive material for electrophotography
AssigneesRicoh Company, Ltd., Ricoh Research Institute of General Electronics Co., Ltd.
InventorsMasafumi Kumano, Koichi Haga, Yasuyuki Shindoh
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Abstract
The present invention is concerned with a photosensitive material for electrophotography that comprises forming a photosensitive layer on a substrate, wherein said photosensitive layer is constructed by laminating a charge transfer layer, a first charge carrier generating layer and a second charge carrier generating layer in order from said substrate side to free surface, and said charge transfer layer and second charge carrier generating layer each has a band gap wider than that of said first charge carrier generating layer.
Claims12
A photosensitive material for electrophotography that comprises a photosensitive layer on an electrically conductive substrate or on an electrically conductive layer provided on a electrically non-conductive substrate, wherein said photosensitive layer consists essentially of three layers, ( 1) a charge transfer layer provided on said conductive substrate or on said conductive layer provided on said non-conductive substrate, (2) a first charge carrier generating layer provided on said charge transfer layer and (3) a second charge carrier generating layer provided on said first charge carrier generating layer, said charge transfer layer and second charge carrier generating layer each having a band gap wider than that of said first charge carrier generating layer, said first charge carrier generating layer being photosensitive to radiation having a relatively long wavelength and said second charge carrier generating layer being photosensitive to radiation having a relatively short wavelength.
Dependencies are inferred from the claim text.