Patent ID: 7167669
Filing Date: 2007-01-23
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a plurality of toner image forming devices, each comprising: a rotating photoconductor; a charging device that uniformly charges a surface of the photoconductor; a latent image forming device that forms an electrostatic latent image on the surface of the charged photoconductor; a developing device that develops the electrostatic latent image on the surface of the photoconductor to a toner image; and a developing container that contains toner used by the developing device, wherein a diameter of the photoconductor of at least one toner image forming device of the plurality of toner image forming devices is formed larger than a diameter of the photoconductor of the other toner image forming devices, each developing container of all the toner image forming devices is formed in equal-sized, and a center of rotation of a developing roll of each developing device is arranged in a position upper than a center of rotation of each photoconductor; wherein each developing roll comprises a magnet roll having a plurality of magnetic poles, and a diameter of the magnet roll of each toner image forming device is set equally; wherein arrangement positions of the plurality of magnetic poles of the magnet roll of the developing device arranged to face the photoconductor having the larger diameter is different from arrangement positions of the plurality of magnetic poles of the magnet roll of the other developing devices arranged to face the photoconductor other than the photoconductor having the larger diameter.