US 7,395,002 B2
Image forming apparatus and output image density correction method
Yasuhiro Funayama, Saitama (Japan); Makoto Kanai, Saitama (Japan); Hisashi Fukasawa, Saitama (Japan); Masaru Sakuma, Saitama (Japan); and Kiyoshi Nagamine, Saitama (Japan)
Assigned to Fuji Xerox Co., Ltd., Tokyo (Japan)
Filed on May 26, 2006, as Appl. No. 11/420,656.
Claims priority of application No. 2005-293506 (JP), filed on Oct. 06, 2005; and application No. 2005-327275 (JP), filed on Nov. 11, 2005.
Prior Publication US 2007/0081829 A1, Apr. 12, 2007
Int. Cl. G03G 15/00 (2006.01); G03G 15/08 (2006.01)
U.S. Cl. 399—49  [399/44] 11 Claims
OG exemplary drawing
 
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.