Patent ID: 7395002
Filing Date: 2008-07-01
Classification: G03G

Abstract:
1. An image forming apparatus having an image forming engine for forming an image by charging the surface of an image carrying body uniformly, forming a static latent image by irradiating a light beam to the uniformly charged image carrying body corresponding to image data, developing the image with toner by a developing device, transferring the toner image to a recording medium directly or through an intermediate transfer body and fixing the transferred toner image, the image forming apparatus comprising: an outputted image density control portion that forms a patch image for outputted image density correction and determines an outputted image density control condition based on a comparison result of the density of the patch image with a preliminarily set target value; a pixel count portion capable of counting the amount of image pixel at the time of image formation; a pixel count value accumulating memory portion that accumulates and stores the pixel count value obtained by counting by the pixel count portion; a toner supply portion capable of supplying the toner to a developing device quantitatively; a toner supply amount measuring portion capable of measuring the amount of toner supplied to the developing device by the toner supply portion; a toner supply amount accumulating memory portion that accumulates and stores the toner supply amount measured by the toner supply amount measuring portion; and a target value correcting portion that corrects the target value of the density of the patch image from the relation between a pixel count accumulating value stored in the pixel count value accumulating memory portion and a toner supply amount accumulation value stored in the toner supply amount accumulating memory portion.