Patent ID: 8036552
Filing Date: 2011-10-11
Classification: G03G

Abstract:
1. A color image forming apparatus comprising: a forming unit configured to form an image on an image carrier using a color developer and a black developer; a controller configured to form on the image carrier a superimposed pattern by the forming unit in which a pattern of the black developer is superimposed on a pattern of the color developer as a background color; a detector configured to irradiate the superimposed pattern with light and detect diffuse reflected light from a non-specular angle; a calculator configured to determine a position of the pattern of the color developer and a position of the pattern of the black developer based on a detection result of the diffuse reflected light from the superimposed pattern by the detector and calculate a deviation amount in relative positions between the pattern of the color developer and the pattern of the black developer; and an adjustor configured to adjust an image forming condition based on a calculation result by the calculator.