Patent ID: 9678455
Date: 2017-06-13
CPC Classifications: B41J,G02B,G03G,H04N

Claim:
1. An optical scanning device comprising: a rotating polygon mirror that deflects and scans beam light from a light source in a main scanning direction; a lens that forms an image of the beam light deflected by the rotating polygon mirror on a surface to be scanned; one or more planar mirrors provided on an optical path between the rotating polygon mirror and the surface to be scanned and reflecting the beam light so as to be led to the surface to be scanned; and a pressing member that presses a back surface of the planar mirror, wherein the planar mirror comprises: a first planar mirror including a glass plate, which has a light incident surface into which the beam light is incident and an opposite surface arranged at an opposite side of the light incident surface and allows the beam light to pass therethrough, and a reflection layer arranged on the opposite surface of the glass plate; and a second planar mirror having the back surface pressed by the pressing member, wherein the beam light passes through the glass plate of the first planar mirror and is reflected at the opposite surface side, so that a scanning line is curved on the surface to be scanned in a convex shape to one side in a sub-scanning direction, and the back surface of the second planar mirror is pressed by the pressing member and the second planar mirror is curved, so that the scanning line on the surface to be scanned, which has been curved by the first planar mirror, is adjustable to a flat shape.