Charging and exposure section in an electrophotographic apparatus

摘要

In a charging and exposure section of an electrophotographic apparatus, a charging mask defining a charge area of an electrophotosensitive member charged by a charging unit is formed with a cut-out portion which is not exposed through an objective lens focusing the image of a picture carried by an original onto the electrophotosensitive member, so as to form a retrieval mark on a portion of the electrophotosensitive member. This retrieval mark is utilized for judging the condition of exposure on the electrophotosensitive member or for facilitating the picture image quality control.