Optical scanning device and image forming apparatus

摘要

Each light source has plural light emitting portions that are arranged at the different positions in at least a sub-scanning corresponding direction. A memory of a scanning control device stores correction data of the deviation of the beam pitch, correction data of the light amount difference, and correction data to decrease an influence of a reciprocity failure, for each combination of pixel forming light emitting portions. When a write signal is generated, a write control circuit of the scanning control device reads the correction data of the deviation of the beam pitch, the correction data of the light amount difference, and the correction data of the reciprocity failure according to the combination of the pixel forming light emitting portions from the memory, overlaps the read correction data to correction data of an APC, and outputs the overlapped data to a corresponding light source unit as light amount correction data.

主权项

1. An optical scanning device that is used in an image forming apparatus where one pixel is formed by at least two light beams, and scans a scanned surface of the image forming apparatus in a main scanning direction by the at least two light beams, the optical scanning device comprising:
a surface emitting laser array where a plurality of light emitting portions are arranged two-dimensionally at different positions in at least a sub-scanning direction, the plurality of light emitting portions formed on a same substrate; a deflector that deflects light beams from the surface emitting laser array; and a control device that controls a driving state of at least one light emitting portion included in a combination of the light emitting portions to emit the at least two light beams to form the one pixel, among the plurality of light emitting portions, according to a positional relationship between at least two light emitting portions included in the combination in the sub-scanning direction, wherein at least two scan lines that are formed by the at least two light beams to form the one pixel are formed at different timings in two scan lines adjacent to each other, the control device corrects light amounts of the light emitting portions according to an interval in the sub-scanning direction of the two scan lines adjacent to each other such that light emission amounts of at least one light emitting portion included in the combination increase with respect to an initial setting value and light emission amounts of at least another light emitting portion included in the combination decrease with respect to the initial setting value, and the at least two light beams to form the one pixel are deflected on different deflected reflection surfaces of the deflector.