Patent ID: 8471886
Filing Date: 2013-06-25
Classification: B41J,G03G

Abstract:
1. An electrophotographic image forming apparatus that performs latent image rendering using a plurality of light sources, the electrophotographic image forming apparatus comprising: a scanner function for reading printed material; a rendering time control unit that controls a latent image rendering start time at which each of the plurality of light sources starts rendering pixels on a photosensitive body; a scanning time control unit that controls a scanning start time for each of the plurality of light sources; a pixel pattern output unit that forms a plurality of pixel patterns corresponding to pixel pattern data defined in advance, and outputs the plurality of pixel patterns, wherein each of the plurality of pixel patterns has a number of cycles that is an integer multiple of a number of the plurality of light sources; a correction value calculation unit that reads the plurality of pixel patterns outputted by the pixel pattern output unit using the scanner function, and calculates a correction value; and a synchronization unit that performs image output synchronization in which rendering is performed such that a specific line of the plurality of pixel patterns and a specific light source among the plurality of light sources are always in correspondence, wherein the rendering time control unit and the scanning time control unit respectively control the rendering start time and the scanning start time for each of the plurality of light sources based on the correction value calculated by the correction value calculation unit.