Patent ID: 7573494
Filing Date: 2009-08-11
Classification: G03G,H04N

Abstract:
1. An image forming apparatus that forms an electrostatic latent image on a medium to be scanned by laser beams, which are projected from a plurality of laser light sources and periodically deflected by a rotational deflecting unit, so that the laser beams scan the medium, which is uniformly charged and moving in a sub-scanning direction, in a main-scanning direction perpendicular to the sub-scanning direction, the image forming apparatus comprising: a pixel clock generating unit that generates first and second pixel clocks, which are used for controlling timings of projection of said laser beams, separately for each of said laser light sources, and for performing a phase change of each of said first and second pixel clocks; and a phase control unit that controls said first and second pixel clocks such that a respective rising period of said first and second pixels clocks is set shorter or longer than a normal clock period a predetermined interval after detection of a respective synchronization detection signal, said phase control unit controlling said first pixel clock independent of said second pixel clock and controlling said second pixel clock independent of said first pixel clock.