Patent ID: 7734234
Filing Date: 2010-06-08
Classification: G03G,H04N

Abstract:
1. A positional-deviation correction apparatus comprising: a first-pattern forming unit configured to form a plurality of sets of first correction patterns on an endless conveying unit; a second-pattern forming unit configured to form a second correction pattern before the first-pattern forming unit forms the first correction patterns; a detecting unit configured to detect positional information of each set of the first correction patterns and the second correction pattern; a timer configured to determine a start time for detecting the positional information of the first correction patterns of an N-th set, where the timer has a timer value corresponding to a pattern interval between the second correction pattern and the first correction patterns of the N-th set; a storage unit configured to load the positional information of the first correction patterns of the N-th set detected by the detecting unit at a storing time that is subsequent to and based on the start time; and a timing changing unit configured to change a detection timing for detecting the positional information of each set of the first correction patterns from a time point at which the detecting unit detects positional information of the second correction pattern based on the positional information loaded in the storage unit, wherein the second correction pattern is formed in a color furthest from the detecting unit, and the timer and storage unit are configured to respectively determine the start time and load the positional information for each set of the first correction patterns before the timing changing unit changes the detection timing.