Patent ID: 9041761
Filing Date: 2015-05-26
Classification: B41J,G03G

Abstract:
1. An image forming device comprising: a photoreceptor drum including a photoreceptor having a target surface that is scanned in a main scanning direction and a sub-scanning direction orthogonal to the main scanning direction; an exposure head including a plurality of light emitting segments aligned in parallel to the main scanning direction of the photoreceptor drum, wherein each light emitting segment includes a plurality of light emitting elements; an exposure driving unit configured to adjust an image writing position on the target surface in the sub-scanning direction and to selectively drive the plural light emitting segments; a storing unit configured to store a profile in which a respective position of each of the plural light emitting segments corresponds to a correction amount from the main scanning direction toward the sub-scanning direction at every position; and a correcting unit configured to smooth a local change of the correction amount in the profile according to at least one of a first difference between the correction amount for a local light emitting segment and the correction amount for a first light emitting segment proximate the local light emitting segment in a first direction and a second difference between the correction amount for the local light emitting segment and the correction amount for a second light emitting segment proximate the local light emitting segment in a second direction opposite the first direction, wherein for each of the continuous light emitting segments, the correcting unit obtains the correction amount for the first light emitting segment and the correction amount for the second light emitting segment, and determines whether or not the obtained correction amounts are equal so that: when the obtained correction amounts are determined to be equal, the correcting unit changes the correction amount for the current local light emitting segment according to one of the obtained correction amounts, and when the obtained correction amounts are determined to not be equal, the correcting unit corrects the correction amount of the current local light emitting segment to the obtained correction amount which is nearer in value to the correction amount of the current local light emitting segment.