Patent ID: 8872872
Filing Date: 2014-10-28
Classification: G02B,H04N

Abstract:
1. An optical scanning apparatus, comprising: first and second light sources; a deflector configured to deflect beams emitted from the first and second light sources in a main scanning direction; first and second imaging optical systems configured to focus the beams deflected by the deflector on first and second surfaces to be scanned, respectively; and at least one reflection optical element arranged on each of first and second optical paths from the deflector to the first and second surfaces to be scanned, and reflecting an axial beam in a sub-scanning cross section perpendicular to the main scanning direction, wherein the first optical path and the second optical path have different numbers of the reflection optical elements from each other; and the optical scanning apparatus further comprises an adjustor configured to adjust at least one of outputs of the first and second light sources so that the following condition is satisfied: where ±W is an effective scanning range in the main scanning direction with respect to the center image height on the first and second surfaces, and L is an image height allowing the same light quantity on the first and second surfaces to be scanned.