Patent ID: 7498110
Filing Date: 2009-03-03
Classification: G03G

Abstract:
1. An electrophotographic photosensitive member comprising on a conductive substrate at least a photoconductive layer composed mainly of amorphous silicon, a surface layer, and at least one intermediate layer interposed between said photoconductive layer and said surface layer, wherein: said surface layer comprises a metal fluoride, exclusive of silicon fluoride; and said intermediate layer comprises a metal oxide selected from the group consisting of aluminum oxide, magnesium oxide, lanthanum oxide and titanium oxide, wherein when, by using a light scanning device in which the exposure laser light is made incident on a rotary polygonal mirror to deflect the laser light, said photoconductive layer is exposed to said exposure laser light while the incidence angle thereof is being varied, the thickness and refractive index of said intermediate layer is controlled so that the greatest value of reflectance, which varies as a function of the thickness variation of said surface layer and the incidence angle of said exposure laser light, may be 20% or less, wherein the thickness and refractive index of said intermediate layer are controlled so that phase difference Δφ (rad) between a component of said laser light, which is first reflected on the interface between said photoconductive layer and said intermediate layer and then reaches the interface between said intermediate layer and said surface layer, and another component of said laser light, which is reflected on the interface between said intermediate layer and said surface layer, satisfies the condition of the following formula (1): where k represents an integer of 1 to 5.