Patent ID: 7260336
Filing Date: 2007-08-21
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a density sensor irradiating light on an image carrier, receiving light reflected therefrom and outputting a signal based on an amount of received light therefrom; and control means which previously stores correction information indicative of a surface condition of the image carrier prior to the formation of a toner image on the image carrier, and which when determining a density of the toner image formed on the image carrier, corrects the output from the density sensor based on the correction information and then determines the density of the toner image based on the correction value, wherein the control means corrects the correction information according to a degree of the density of the toner image on the image carrier, wherein the control means derives the correction information based on the signal outputted from the density sensor prior to the formation of the toner image on the image carrier and stores the correction information in a storage section, wherein the control means determines the correction information by taking the steps of canceling some sample data pieces of higher order and/or of lower order out of the sample data pieces constituting the signals outputted from the density sensor prior to the formation of the toner image on the image carrier, and replacing each of the canceled data pieces with an average value of the remaining sample data pieces.