| 摘要 |
A laser scanning unit is provided to improve heat radiation of heat-radiating components by combining a circuit board, on which a driving motor and a driver IC(Integrated Circuit) is loaded, with the outer face of a housing. A laser scanning unit includes a light source(110) generating light, a polygon mirror(121), a driving motor(123), a circuit board(125), and a housing(100). The polygon mirror deflects the light emitted from the light source and scans the light on a photosensitive substance. The driving motor rotates the polygon mirror. The polygon mirror and the driving motor are coaxially mounted on one side(125a) of the circuit board. The circuit board is combined with the housing. An opening(100') is formed at the face of the housing, which is combined with the circuit board. The polygon mirror is inserted into the housing through the opening. The other side(125b) of the circuit board is exposed to the outside to function as a heat-radiating plane.
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