IMAGE FORMING DEVICE

PROBLEM TO BE SOLVED: To form an image having uniform gray level and stabilized image quality while avoiding such trouble as staining the rear side of a sheet. SOLUTION: A laser beam is lighted only for a time required for regulating the quantity of light thereof within the time t2 of non-image forming timing in single scanning of inter-sheet timing. Consequently, the laser is not lighted in the image forming region on a photosensitive body and such a trouble as unnecessary toner adheres to the photosensitive body, a transfer unit, and the like, to contaminate the rear side of a following sheet can be avoided. Furthermore, it is not required to enlarge the carrying interval only when the quantity of light is regulated and the quantity of laser light can be regulated surely at the inter-sheet timing.