Light Scanning Device Reducing Deformation of ftheta Lens and Housing and Image Forming Apparatus with the Same

摘要

A light scanning device include a housing and an fθ lens. The housing includes a bottom plate and a sidewall disposed upright at the bottom plate. The rotating polyhedron and the fθ lens are each installed at the bottom plate of the housing. The rotating polyhedron is configured to deflect and scan light beam. Light beam deflected and scanned by the rotating polyhedron transmits the fθ lens. The bottom plate of the housing includes a stepped portion at a part corresponding to a peripheral area of the fθ lens. The stepped portion is formed lower than a top surface of the bottom plate. The stepped portion has a ridge line in a concavo-convex shape.

主权项

1. A light scanning device, comprising:
a housing that includes a bottom plate and a sidewall disposed upright at the bottom plate; and a rotating polyhedron and an fθ lens each installed at the bottom plate of the housing, the rotating polyhedron being configured to deflect and scan light beam, the light beam deflected and scanned by the rotating polyhedron passing through the fθ lens; wherein: the bottom plate of the housing includes a stepped portion at a part corresponding to a peripheral area of the fθ lens, the stepped portion being formed lower than a top surface of the bottom plate, the stepped portion having a ridge line in a concavo-convex shape.