Patent ID: 9158223
Filing Date: 2015-10-13
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a photosensitive member configured to rotate in a sub-scanning direction; first and second light sources configured to emit first and second light beams with which different positions on the photosensitive member in the sub-scanning direction are irradiated and with which the photosensitive member is scanned in a main scanning direction intersecting the sub-scanning direction; a developing device configured to develop a latent image formed on the photosensitive member with the first and second light beams; a transfer member configured to transfer the image developed on the photosensitive member onto a recording medium; a shift unit configured to shift image data in the sub-scanning direction so that the deviation in sub-scanning direction is corrected with respect to one line generated by the first or the second light source; and a driving unit configured to drive the first and second light sources based on the image data corrected corresponding to the first and second light sources by the shift unit, wherein the shift unit is configured to shift image data corresponding to the first light source in the sub-scanning direction based on a divided-position common to the first and second light sources in the main-scanning direction and a first shift amount corresponding to a distortion characteristic of the first light source, a plurality of pieces of image data is included between two of the adjacent divided positions and the shift unit shifts the image data with respect to the plurality of pieces of image data by using same shift amounts which correspond to the two of the divided positions, and wherein the shift unit is configured to shift image data corresponding to the second light source in the sub-scanning direction based on the divided-position and a second shift amount corresponding to a distortion characteristic of the second light source, a plurality of pieces of image data are included between two of the adjacent divided positions and the shift unit shifts the image data with respect to the plurality of pieces of image data by using same shift amounts which correspond to the two of the divided positions.