Patent ID: 8094177
Filing Date: 2012-01-10
Classification: G03G

Abstract:
1. An image-forming device comprising: an image-forming unit comprising: a first conveying unit configured to convey the recording medium to the transferring position in a sub-scanning direction orthogonal to the main scanning direction; a first changing unit configured to change a rotating speed of the rotatable mirror to change the first length; a second changing unit configured to proportionally change a conveying speed of the first conveying unit in accordance with the change of the rotating speed of the rotatable mirror; and a third changing unit configured to proportionally change a rotating speed of the photosensitive drum in accordance with the change of the rotating speed of the rotatable mirror, wherein the image-forming unit is configured to form a plurality of test patterns when a changing rate of the rotating speed of the rotatable mirror exceeds a predetermined value; an adjusting unit configured to adjust, in accordance with the change of the rotating speed of the rotatable mirror, a timing when the light-emitting unit emits the laser beam to adjust a position of the image in the sub-scanning direction, and a position of the image in the main scanning direction, a detecting unit configured to detect offsets of the plurality of test patterns from a predetermined position in the sub-scanning direction; and a producing unit configured to produce correction data based on the offsets, wherein the image-forming unit is configured to form the image based on the correction data.