Patent ID: 9703097
Date: 2017-07-11
CPC Classifications: B41J,G02B,G03G

Claim:
1. A light scanning device comprising: a first light source that emits a first light beam; a second light source that emits a second light beam; a polygon mirror including a rotation shaft and a deflection surface, the deflection surface ensuring entering of the first light beam and the second light beam at an identical timing, the polygon mirror reflecting the first light beam and the second light beam to scan on a scanned surface in a main-scanning direction while rotating around the rotation shaft; a first incidence optical system that causes the first light beam having a first incidence opening angle to enter the deflection surface; a second incidence optical system that causes the second light beam having a second incidence opening angle to enter the deflection surface, the second incidence opening angle being different from the first incidence opening angle; a first scanning lens located between the deflection surface and the scanned surface, the first scanning lens forming an image of the first light beam on the scanned surface; and a second scanning lens that forms an image of the second light beam on the scanned surface, wherein reflection points of the first and the second light beams on the deflection surface at corresponding time points which each light beam passes through a position on an optical axis of each scanning lens are different locations in a rotating direction of the polygon mirror, the first scanning lens is superimposed on the second scanning lens such that a first axial point which is located on a position on the optical axis of an incident surface of the first scanning lens and a second axial point which is located on a position on an optical axis of an incident surface of the second scanning lens are different locations in the main-scanning direction and an optical axis direction.