Patent ID: 7589878
Filing Date: 2009-09-15
Classification: G02B,H04N

Abstract:
1. An optical scanning device comprising: a plurality of common light sources that is driven by a direct modulation; a deflecting unit including a reflection mirror having N number of surfaces, where N is a positive integer; a beam splitting unit that splits a beam emitted from each of the common light sources and outputs a split beam to the reflection mirror; a scanning optical system that guides a beam scanned by the deflecting unit to a scanning target surface; and a common photo detecting unit that detects a plurality of split beams scanned by the deflecting unit, wherein the split beams respectively scan different scanning target surfaces, incident directions of the beams incident on the reflection mirror from the common light sources make a predetermined angle θ when time between two consecutive synchronization detection signals on a time line generated by the common photodetecting unit is ti, where i is a positive integer equal to or smaller than number of the split beams, at least one of ti is different from others.