Intensity control unit for image forming apparatuses

摘要

A method of controlling the intensity of scanning light in a color image forming apparatus in which a photosensitive member is scanned with light modulated according to an image signal, comprises: a first step of turning on a light source of scanning light in order to illuminate at least the whole of one main scanning line before image formation based on the first color component, and controlling the light source according to the intensity of scanning light; a second step of controlling the light source according to the intensity of scanning light during scanning of a non-image scanning area before the image formation based on the first color component and after the intensity control of the first step; and a third step of controlling the light source according to the intensity of scanning light during scanning of a non-image scanning area between two cycles of image formation based on a color component.