Patent ID: 6842601

Claim:
An image forming apparatus configured to form a full-color image using a color matching pattern of color components formed on an intermediate transfer belt, said image forming apparatus comprising: at least one pattern detection sensor configured to detect the color matching pattern and configured to generate pattern detection signals; a seam mark detecting sensor configured to detect a seam mark formed on the intermediate transfer belt and configured to generate seam mark detection signals, said seam mark detecting sensor being aligned with the pattern detection sensor on a same axis extending vertically relative to a traveling direction of the intermediate transfer belt; a memory configured to store digital signals converted from the pattern detection signals and the seam mark detection signals; a seam mark detection signal deleting device configured to delete a prescribed seam mark detection signal from the pattern detection signals when the pattern detection signal and the prescribed seam mark detection signal simultaneously occur; and a control device configured to control the image forming apparatus in accordance with the pattern detection and seam mark detection signals excluding the prescribed seam mark detection signal.