Electrophotographic apparatus

An electrophotographic apparatus comprising:

• a photosensitive body, said photosensitive body including an amorphous silicon photosensitive layer;
• electrostatic image forming means for forming an electrostatic image on said photosensitive body, said electrostatic image forming means including light exposing means for exposing said photosensitive body by a digital light in accordance with image information, and said exposing means exposing a portion that is a background for an image;
• and
• developing means for developing said electrostatic image using a developer, wherein rate throughout the developer of contained particles having a diameter equal to or smaller than 1 μm is 5 to 40 number %,
• wherein, when A denotes a one-pixel width and Wv denotes a width at a half value of a peak in a potential distribution of said electrostatic image formed by exposing said photosensitive body using the digital light of one pixel,
• 0.6≦Wv/A≦1.0 is satisfied.