Patent ID: 7932005
Filing Date: 2011-04-26
Classification: G03G

Abstract:
1. A negatively-chargeable electrophotographic photosensitive member comprising: a cylindrical substrate having a conductive surface, and a photoconductive layer formed of a non-single crystal material containing silicon atoms, wherein a first lower-part layer formed of a non-single crystal material containing silicon atoms and a second lower-part layer formed of a non-single crystal material containing silicon atoms are provided between the cylindrical substrate and the photoconductive layer, an upper-part layer formed of a non-single crystal material containing silicon atoms is provided on the photoconductive layer, the first lower-part layer is a layer containing an element belonging to Group 13 of the periodic table, the upper-part layer has a region capable of retaining electrification charges, and the first lower-part layer has a layer thickness of from 0.1 μm or more to 10 μm or less, and the product of i) the content, in atom ppm, of the Group 13 element, based on the total number of atoms of constituent elements contained in the first lower-part layer and ii) the layer thickness of the first lower-part layer is from 8 atom ppm·μm or more to 240 atom ppm·μm or less.