Patent ID: 8503895
Filing Date: 2013-08-06
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image bearer to bear an image; an image formation device to form a toner image on the image bearer; at least two toner adhered amount detectors, aligned in a main scanning direction of the image forming apparatus above the image bearer, to detect an amount of toner particles adhered to the toner image on the image bearer; and an image density controller to form at least one gradation pattern including at least two toner patches, staggered at different positions on the image bearer, facing the at least two toner adhered amount detectors, and sequentially arranged in a sub-scanning direction of the image forming apparatus on the image bearer from the least toner adhered amount patch bearing a different amount of toner particles from each other, said image density controller adjusting an image formation condition for the image formation device based on detection values of the at least two toner patches detected by the at least two toner adhered amount detectors, wherein one of the at least two toner adhered amount detectors detects a toner patch of one color at a same time that another of the at least two toner adhered amount detectors detects a toner patch of another color.