Patent ID: 9025197
Filing Date: 2015-05-05
Classification: H04N

Abstract:
1. An optical scanning device which forms a plurality of scanning lines on a photosensitive member, comprising: a plurality of light sources configured to emit m light beams for exposing different positions on one photosensitive member in a rotation direction of the one photosensitive member; a deflection unit configured to deflect the m light beams such that the m light beams scan the photosensitive member in a main-scanning direction; a lens through which the m deflected light beams pass; a curvature detection unit configured to detect n first curvatures of n (n<m) first light beams in the m light beams in a sub-scanning direction orthogonal to the main-scanning direction, and to determine n first equations representing the n first curvatures of the n first light beams based on the detected n first curvatures; an interpolating unit configured to interpolate using the n first equations to obtain (m−n) second equations representing (m−n) second curvatures of (m−n) second light beams other than the n first light beams in the m light beams; and a calculating unit configured to calculate n first correction data of the n first light beams based on the n first equations and (m−n) second correction data of the (m−n) second light beams based on the (m−n) second equations.