Patent ID: 6771296
Filing Date: 2004-08-03
Classification: G02B,G06K,H04N

Abstract:
An optical scanning device, comprising:a plurality of light sources; a drive circuit connected to said light sources to drive said light sources independently from each other in a modulating manner; a deflector having a plurality of deflecting surfaces to deflect rays emitted from said light sources; scan imaging optical systems directing said deflected rays onto respective scan surfaces; synchronization detection means for receiving the rays being directed by the respective scan imaging optical systems and outputting synchronization detection signals before a respective writing operation on each of the respective scan surfaces starts; delay time adjusting means for adjusting time periods after the synchronization detection means output said synchronization detection signals until starting each respective writing operation; and frequency adjustment means for adjusting driving frequencies of said light sources, wherein said delay time adjustment means and said frequency adjustment means are adjusted such that a sense of position offset in a main scan direction between a dot formed on one of the respective scan surfaces and a dot formed on another one of the respective scan surfaces in at least one end region of the effective write-in width is opposite to a sense of position offset in the main scan direction between a dot formed on one of the respective scan surfaces and a dot formed on another one of the respective scan surfaces in a center region of the effective write-in width.