Patent ID: 6701117
Filing Date: 2004-03-02
Classification: G03G

Abstract:
An image forming apparatus comprising:at least two image forming means; transferring means for successively superimposing and transferring images formed by said image forming means onto a transfer medium; pattern forming means for forming an image misregister detection pattern for detecting a positional deviation between the images formed by said image forming means; pattern detecting means for detecting the image misregister detection pattern formed on said transfer medium by said pattern forming means; pattern position detecting means for detecting a position of said image misregister detection pattern from a detection signal obtained from said pattern detecting means; and positional deviation correcting means for correcting a positional deviation of at least one of said image forming means based on a detection result of said pattern position detecting means, wherein said pattern position detecting means detects a time when the detection signal from said pattern detecting means has been continuously outputted for a predetermined time and thereafter detects a time when outputting of the detection signal has been stopped, to thereby detect the position of said image misregister detection pattern.