Patent ID: 8310734
Filing Date: 2012-11-13
Classification: H04N

Abstract:
1. An image forming apparatus comprising: a forming unit configured to form a mark on a carrier and including a plurality of forming units, each forming unit configured to form respective marks in respective colors different from each other; a light emitting unit configured to emit light toward a surface of the carrier; a light receiving unit configured to receive reflected light from the surface of the carrier and from the mark and to output a light reception signal corresponding to an amount of the received reflected light; a processor; and memory storing computer readable instructions that, when executed, cause the image forming apparatus to: detect a position of the mark on the carrier based on a signal wave included in the light reception signal; modify the detected position of the mark by a modification amount corresponding to a difference in a waveform of the signal wave corresponding to the mark so as to reduce an error between the detected position and an actual position;