IMAGE FORMING APPARATUS AND IMAGE DISPLACEMENT CORRECTION METHOD

摘要

An image forming apparatus includes: a first optical head group including first optical heads arranged in a sub-scanning direction; a second optical head group including second optical heads arranged in the sub-scanning direction and overlapping the first optical head group in a main scanning direction; a detector that detects displacement amounts between the first optical heads and the second optical heads; and a controller that performs registration based on the detection by the detector. The controller performs, with one of the first optical heads as a reference, registration on the other first optical heads, performs, with one of the second optical heads as a reference, registration on the other second optical heads, and performs registration between the first optical head group and the second optical head group based on a displacement amount between one of the first optical heads and one of the second optical heads.

主权项

1. An image forming apparatus comprising:
a first optical head group and a second optical head group that form electrostatic latent images on at least one image carrier, the first optical head group including a plurality of first optical heads arranged in a sub-scanning direction, the second optical head group including a plurality of second optical heads arranged in the sub-scanning direction, the first optical head group and the second optical head group overlapping each other in a main scanning direction; a detector that is disposed to correspond to a region where the first optical head group and the second optical head group overlap each other and that detects displacement amounts between the first optical heads and the second optical heads; and a controller that performs registration by controlling light emission of the plurality of first optical heads and the plurality of second optical heads based on the detection by the detector, wherein the controller:
with one of the first optical heads in the first optical head group as a reference, performs registration on the other first optical heads in the first optical head group based on the detection by the detector;with one of the second optical heads in the second optical head group as a reference, performs registration on the other second optical heads in the second optical head group based on the detection by the detector; andperforms registration between the first optical head group and the second optical head group based on a displacement amount between one of the first optical heads in the first optical head group and one of the second optical heads in the second optical head group.