Patent ID: 7747182
Filing Date: 2010-06-29
Classification: G03G

Abstract:
1. An image forming apparatus, comprising: a latent image carrier; a development apparatus in which a developer containing a toner and a magnetic carrier is carried on a developer carrier and which performs development in which, by bringing the developer on the developer carrier into contact with the surface of the latent image carrier, the toner is adhered to the latent image on the surface of the latent image carrier; a toner supply apparatus which supplies the toner to the development apparatus; toner density detection means which detects and outputs toner density of the developer in the development apparatus; toner density control means configured to control the toner density of the developer so that an output value of the toner density detection means approximates a toner density control standard value; transfer means which transfers an image on the latent image carrier onto a transfer material; and correction means configured to correct and update the toner density control standard value on the basis of image coverage history information of an output image transferred to the transfer material or image coverage ratio history information of an output image determined from the image coverage and the transfer material size, wherein the history information includes a cumulative average value of the image coverage or the image coverage ratio per transfer material determined for the output transfer material from a certain previous point in time until implementation of the correction.