Electrophotographic photoreceptor laminate - has trap layer for reduced dark decay, and rapidly forms distinct two-colour image

摘要

Laminated electrophotographic photoreceptor comprises (a) conductive base body, 1 (b) prim. photo-conductive layer, (c) trap layer and (d) sec. photo-conductive layer or comprises (a), (b') prim. photoconductive layer contg. trap agent and (d). Component (b) and (b') is sensitive to the light of colour A under positive or negative charging and has electrical potential-holding power sufficient to produce surface potential when the surface of the resultant photoreceptor is positively or negatively corona-charged. Component (d) transmits the light of colour (A) and is sensitive to the light of (B) under positively charging and is sensitive under positively charging when (b) or (b') is sensitive under negatively charging but is hardly sensitive to the light of (A). (d) has electrical potential holding power sufficient to produce surface electrical potential of the resultant photoreceptor on negatively corona-charging on (d) when (b) or (b') is sensitive under positively charging and on positively corona-charging on (d) when (b) or (b') is sensitive under negatively charging. The formation of the trap layer results in reduced dark decay; the photoreceptor is rapidly charged and distinct two-colour image is usually obtd; etc.