ELECTROPHOTOGRAPHIC DEVICE

摘要

PURPOSE:To adjust at least either of copy density and contrast by detecting the surface potential of recording information on a photosensitive body after exposure and adjusting the amount of exposure of the 2nd exposing means according to the detected value. CONSTITUTION:An original 14 is exposed to the surface of the photosensitive drum 4 to form an electrostatic latent image on the drum 4. The potential of this latent image is detected by a surface potential detecting means 20. The detecting means 20 consists of plural PLZT elements, etc., so as to measure the latent images as divided picture elements. Signals from the respective elements of the detecting means are operated by an operation control means 22 and then stored. The 2nd exposing means 21 have light emitting diodes corresponding to the elements of the detecting means. When said latent image reaches the 2nd exposure position, respective elements are driven by the stored signals and the amount of the 2nd exposure is adjusted for every picture element. The 2nd exposing means 21 may consist of the 2nd light source and elements which vary in the quantity of transmitted light with impressed voltages.