Patent ID: 9176322
Filing Date: 2015-11-03
Classification: G02B

Abstract:
1. 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.