Electrophotographic photoreceptor and related method

Claim 1

An electrophotographic photoreceptor comprising a photosensitive layer and a conductive substrate, said photosensitive layer being overlaid on said conductive substrate, said conductive substrate having a uniform surface roughness having such that a center average roughness Ra of standard reference length at 0.25 mm, is not more than 0.6 μm, and said uniform surface roughness satisfying the following condition: ##EQU3## where Ra is the center average roughness and T is a transmittance at a wavelength of a laser beam approximately in a range of 630 nm to 830 nm exposing said photosensitive layer.

Claim 5

A method of forming an electrostatic latent image on an electrophotographic photoreceptor having a photosensitive layer on a conductive substrate, said method comprising the steps of: forming a surface roughness of said conductive substrate such that a center average roughness Ra of standard reference length at 0.25 mm, is not more than 0.6 μm, and said surface roughness satisfying the following condition: ##EQU4## where Ra is the center average roughness and T is a transmittance at a wavelength of light exposing said photosensitive layer; charging a polarity on a surface of said electrophotographic photoreceptor; exposing said electrostatic latent image to a laser beam having a wavelength approximately in a range of 630 nm to 830 nm; and developing said electrostatic latent image, wherein said forming step eliminates interference fringe patterns and spots from appearing on said image.

Claim 6

A method of forming an electrostatic latent image on an electrophotographic photoreceptor having a photosensitive layer on a conductive substrate, said method comprising the steps of: forming a surface roughness of said conductive substrate such that a center average roughness Ra of standard reference length at 0.25 mm, is not more than 0.6 μm, and said surface roughness satisfying the following condition: ##EQU4## where Ra is the center average roughness and T is a transmittance at a wavelength of light exposing said photosensitive layer; charging a polarity on a surface of said electrophotographic photoreceptor; exposing said electrostatic latent image to a laser beam having a wavelength approximately in a range of 630 nm to 830 nm; and developing said electrostatic latent image, wherein said forming step eliminates interference fringe patterns and spots from appearing on said image.