Patent ID: 7151556
Filing Date: 2006-12-19
Classification: B41J,G02B

Abstract:
1. A multi-beam laser scanning unit for scanning multiple laser beams onto a photoreceptor medium, comprising: a plurality of laser sources each emitting a laser beam; a collimating lens collimating the laser beams; a polygon mirror deflecting the collimated laser beams; a f-θ lens focusing the deflected laser beams onto the photoreceptor medium; a transparent member disposed between the f-θ lens and the photoreceptor medium, and having a thickness varying depending on a height thereof perpendicular to a direction where the laser beams pass through the transparent member; and a movable member varying the height of the transparent member with respect to the plurality of laser sources, wherein the transparent member has an inclined lower side inclined with respect to a scanning direction of the laser beams, and the movable member has an inclined surface inclined with respect to the inclined lower side of the transparent member.