Patent ID: 8791975
Filing Date: 2014-07-29
Classification: G02B,G03G,H04N

Abstract:
1. An optical scanning device comprising: a light source that emits a light beam; a deflection scanning unit that deflects the light beam in a main scanning direction and scans the light beam on a target surface; a plurality of lenses that are located on an optical path of the light beam from the deflection scanning unit to the target surface; a body that houses the light source, the deflection scanning unit, and the lenses, the deflection scanning unit being directly mounted on an inner surface of the body; a heat dissipating unit that dissipates heat of the deflection scanning unit, the heat dissipating unit being outside of the body and at least partially on an outer surface of the body, the heat dissipating unit adjoining a position on the body at which the deflection scanning unit is directly mounted to the body; an air blowing unit that blows air; a pair of wall portions that face each other with the heat dissipating unit between the wall portions, the pair of wall portions extending in an air-flow direction in which the air flows to form an air-flow path; and a hole in the outer surface of the body, the heat dissipating unit thermally connected to the deflection scanning unit through the hole, wherein the heat dissipating unit is attached to the outer surface of the body by a screw, the heat dissipating unit is one of in direct contact with a circuit board of the deflection scanning unit through the hole and in direct contact with a heat-transfer sheet, the wall portions are configured to direct air from the air blowing unit across the heat dissipating unit to transfer heat away from the heat dissipating unit, a width of the heat dissipating unit gradually increases from an upstream side to a downstream side of an air flowing direction, and a height of the heat dissipating unit on an upstream side of the air-flow direction is shorter than a height of the heat dissipating unit on a downstream side of the air-flow direction.