Patent ID: 7715769

Claim:
A displacement correction device for use in a color image forming device, the displacement correction device comprising: a rotating unit that rotates an endless member; an image forming unit corresponding to each of a plurality of colors that includes a photoconductor and an exposing unit, and sequentially forms on the rotating endless member a displacement correction pattern image having a line-shaped pattern in a corresponding color; a pattern detecting unit that detects the displacement correction patterns on the rotating endless member; a storage unit that stores therein detection execution timing information for setting a detection execution timing at which the pattern detecting unit is to detect the displacement correction patterns depending on a tolerance in a layout and a dimension of at least one of the image forming unit, the pattern detecting unit, and the endless member, the detection execution timing including a detection start timing at which the pattern detecting unit starts detection of the displacement correction patterns after starting exposure of the photoconductor by the exposing unit until, and a detection termination timing at which the pattern detecting unit terminates the detection of the displacement correction patterns; a controlling unit that controls the pattern detecting unit to detect the displacement correction patterns based on the detection execution timing information stored in the storage unit; and an updating unit that updates the detection execution timing information stored in the storage unit when the detection execution timing information differs from a reference timing.