Image forming apparatus and control method therefor,申请号US20030676804-传众专利搜索

Image forming apparatus and control method therefor

申请公布号：US7420583(B2)

申请号：US20030676804

申请日期：2003.10.01

申请公布日期：2008.09.02

申请人：

CANON KABUSHIKI KAISHA

发明人：SATO MITSUHIKO;KOH SHOKYO;FUJIMORI TAKASHI;SUNADA HIDENORI

分类号：B41J15/14;B41J29/38;B41J2/44;B41J27/00;G03G15/01;G03G15/04;G03G21/00;H04N1/29;H04N1/46

主分类号：B41J15/14

摘要：There is provided an image forming apparatus which is capable of reducing a period of time required for obtaining an image output, in the case of changing the image forming operation from a monochromatic image formation to a color image formation during execution of the image forming operation. A plurality of image forming units form images and overlap images the formed images onto a transfer material. A preparation for image formation is started in a first mode in which image formation is carried out by the plurality of image forming units while image formation is being carried out in a second mode in which image formation is carried out by at least one of the image forming units. The image formation is carried out in the first mode after the image formation in the second mode is completed.