Image forming apparatus that obtains misregistration amount from detection result of detection pattern

摘要

An image forming apparatus includes: a detection unit configured to detect a detection pattern on a first region in a first misregistration state and the detection pattern on a second region in a second pattern in a second misregistration state, and a control unit configured to perform misregistration correction by obtaining a misregistration amount in the main scanning direction based on a detection result of the detection pattern. The detection pattern has a first edge that is tilted by a first angle with respect to the main scanning direction on the first region, and has a second edge that is running in the main scanning direction or tilted by a second angle, which is smaller than the first angle, with respect to the main scanning direction on the second region.

主权项

1. An image forming apparatus, comprising:
a forming unit configured to form a detection pattern on a first region and a second region of an image carrier, a position of the second region being different from that of the first region in a main scanning direction; a detection unit configured to detect the detection pattern only on the first region if an absolute value of a misregistration amount in the main scanning direction is less than a threshold, and to detect the detection pattern only on the second region if the absolute value of the misregistration amount in the main scanning direction is greater than the threshold; and a control unit configured to perform misregistration correction by obtaining a calculated misregistration amount in the main scanning direction based on a detection result of the detection pattern on the first region or the second region, wherein the detection pattern has a first edge that is tilted by a first angle with respect to the main scanning direction on the first region, and has a second edge that runs in the main scanning direction or is tilted by a second angle, which is smaller than the first angle, with respect to the main scanning direction on the second region.