Electrophotographic copying machine with device for eliminating unwanted black areas

摘要

A copying machine includes a device for eliminating unwanted black areas caused by insufficient light exposure when copies are made, for example, from a bulky original. The device includes a central processing unit to calculate the timing at which an auxiliary light source disposed inside the copying machine should be turned on so that the portions of a latent image formed on its photosensitive body, which would result in unwanted black areas on the copy paper, are eliminated by the timely exposure of these portions by the auxiliary light source.