| 摘要 |
An image forming apparatus which concurrently exposes by multiple laser beams corresponding to M lines on the photoreceptor, comprising: multiple light sources for emitting laser beams; a memory section for storing the image data; a control section to control the plurality of light sources, wherein the control section is capable of controlling image formation by: a first mode for reading-out of image data for M lines, exposing by multiple light sources of M lines according to the image data for M lines, and forming an image at a predetermined sub-scanning direction image formation speed of VM; and a second mode for reading-out of image data for N lines (where N<M), exposing by multiple light sources of M lines according to read-out image data for N lines and blank data for M-N lines, and forming an image at a sub-scanning direction image formation speed VN, where VN=VM-(N/M).
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