Patent ID: 8681196

Claim:
A scanning exposure device comprising: a reflecting member that has a width extending from a first end to a second end in a main scanning direction, to reflect a light irradiated by an irradiating unit; a housing that has a bottom, a first sidewall to which the first end is fixed, a second sidewall facing the first sidewall, to which the second end is fixed, and an aperture provided in an opposing relation to the bottom, the aperture opening in a direction of a light reflected by the reflecting member; and a cover that covers the aperture, the cover forming a passing portion that allows the light reflected by the reflecting member to pass through, and providing a first fixed position at which the cover is fixed on the first sidewall at a top surface of the first sidewall and a second fixed position, paired with the first fixed position, at which the cover is fixed on the second sidewall at a top surface of the second sidewall, wherein each pairing of every position at which the cover is fixed on the first sidewall and every position at which the cover is fixed on the second sidewall is arranged so as to form a line extending in a direction offset from the main scanning direction, and wherein a height from the first fixed position to the bottom is different from a height from the second fixed position to the bottom.