Apparatus and method for detecting developing ability of an image forming apparatus with varied LED continuous lighting time for image forming and process control modes

摘要

An image forming apparatus includes an photoconductive drum, a charger, an exposing device, a developing device and a transferring device. A photo-sensor is disposed around the photoconductive drum. The photo- sensor senses the intensity of the reflected light from the surface of the photoconductive drum and the reflected light from the reference toner image formed on the photoconductive drum. The intensity of the emitted light from photo-sensor is changed corresponding to a continuous lighting time of the photo-sensor. Therefore, the intensity is compensated in response to the continuous lighting time of the photo- sensor. As a result, accurate toner density is detected.