Patent ID: 7536121
Filing Date: 2009-05-19
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image carrier that carries thereon an electrostatic latent image; a developing unit that develops the latent image by using toner that is included in a developer that includes magnetic toner-carrier; a toner supply unit that supplies the toner to the developing unit; a toner-density detector that detects toner-density in the developer supplied to the developing unit; a reference-value determining unit that determines a reference-value that is a density reference of the toner in the developer; a toner-supply control unit that controls a toner that is supplied to the developing unit based on a difference between the toner-density detected by the toner-density detector and the reference-value; a ratio-calculating unit that calculates a ratio of a total area of images to a total area of recording medium; and a condition determining unit that determines whether a predetermined condition is satisfied, wherein