Light scanning device reducing deformation of fθ theta lens and housing and image forming apparatus with the same
AssigneeKYOCERA Document Solutions Inc.
InventorRyoutarou Todokoro
Life of this patent
Estimating the term…
Abstract
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.
Claims5
A light scanning device scanning in a main scanning direction defining a longitudinal orientation, the light scanning device comprising:
- a housing that includes a bottom plate and a sidewall disposed upright on the bottom plate;
- a rotating polyhedral light-beam deflector/scanner installed on a top surface of the housing bottom plate;
- and
- an fθ lens installed on the top surface of the housing bottom plate in a position where light beams from the rotating polyhedral deflector/scanner pass through the fθ lens, a longitudinally central portion of the fθ lens being concave such as to curve toward the polyhedral deflector/scanner;
- wherein
- a longitudinally extending portion of the top surface of the housing bottom plate is recessed with a stepped part along an opposite side of the fθ lens from the lens' concave side, the stepped part defining a longitudinally extending ridge, and a portion of the ridge corresponding to the concave, longitudinally central portion of the fθ lens being concavo-convex in a direction perpendicular to the main scanning direction.
Dependencies are inferred from the claim text.