Patent ID: 6556233
Filing Date: 2003-04-29
Classification: G02B

Abstract:
An electrophotographic apparatus comprising:a light scanning device for guiding a light bean onto a reflecting surface of a rotary polygon mirror and deflecting the light beam; and a recording medium, which the light beam deflected by said light scanning device scans to form an image, said recording medium comprising an a-Si base photosensitive member, said a-Si base photosensitive member including a surface layer having a film thickness varying in a main scanning direction, and further having a refractive index varying in the main scanning direction due to a variance in film quality depending on an angle of the light beam incident to said surface layer and having a liner photosensitivity (EV) characteristic, wherein the following inequality satisfied: 3.0&gE;D/W&gE;1.5, where D is a diameter of the light beam at said reflecting surface of said rotary polygon mirror, and W is a width in the main scanning direction of said reflecting surface of said rotary polygon mirror.