Patent ID: 7697021
Filing Date: 2010-04-13
Classification: B41J,G02B,G03G,H04N

Abstract:
1. An image forming apparatus that controls a plurality of laser beams based on image data of different colors and performs an exposure scanning operation for a photoconductor drum to form an image, comprising: first and second laser source sections that irradiate a polygon mirror with laser beams from different directions; first and second light scanning sections that allow the polygon mirror to reflect the laser beams from the first and second laser source sections toward different optical axis directions to scan the laser beams at a predetermined deflection angle; a first beam detector that is disposed at the beam incident end in the scanning direction of the first light scanning section and receives a first laser beam to detect the start of the scanning; and a second beam detector that is disposed at the beam incident end in the scanning direction of the second light scanning section and receives a second laser beam to detect the start of the scanning at an earlier timing than the first beam detector does; wherein a distance between the first beam detector and the first light scanning section and a distance between the second beam detector and the second light scanning section are different.