Patent ID: 7809291

Claim:
An image forming apparatus, comprising: a latent image carrier; a development apparatus in which a two-component developer containing a toner and a magnetic carrier is carried on a developer carrier and which performs development in which, by bringing the two-component 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 configured to supply the toner to the development apparatus; toner density detection means for detecting and outputting toner density of the two-component developer in the development apparatus; toner density control means for comparing an output value of the toner density detection means and toner density control standard value and, by controlling the toner supply apparatus on the basis of the comparative result, controlling the toner density so that the output value approximates the toner density control standard value; information detection means for detecting information for ascertaining a toner replacement amount in the development apparatus in a prescribed time period, the information including an image coverage ratio of the latent image; and correction means for correcting the toner density control standard value to produce a corrected toner density control standard value on the basis of the detected result by the information detection means during continuous printing between when a previous development is completed and when a subsequent development is to be initiated so as to maintain a predetermined development capability of the development apparatus.