Synchronization signal generating unit of an image forming apparatus

摘要

In an image forming apparatus for simultaneously recording plural image lines on a recording medium by scannintg simultaneously with plural light beams along parallel scanning lines in a primary scanning direction, before a deviation detector detects a deviation among the plural light beams in the primary scanning direction, a beam power controller adjusts the electric power for each light beam generator so that the beam diameter of each light beam is made equal to each other.