Patent ID: 8167475
Filing Date: 2012-05-01
Classification: G03B,H04N

Abstract:
1. A linear lighting apparatus comprising: a rod-like optical waveguide member formed by a transparent material, a light source provided near an end face of the optical waveguide member in a longitudinal direction, and a light exit surface formed on at least part of a side surface of the optical waveguide member in the longitudinal direction, wherein a sectional structure of optical waveguide member in a widthwise direction perpendicular to the longitudinal direction, comprises: the light exit surface; two reflecting areas provided at positions to face the light exit surface ; and a barrier provided between the two reflecting areas, the barrier having two light reflection surfaces facing each other, wherein each light reflection surface merges with a respective reflecting area so that an angle between each light reflection surface and a respective reflecting area is an obtuse angle, wherein the two reflecting areas each comprise a plurality of projecting portions and flat portions alternately arranged at intervals in the longitudinal direction of the optical waveguide member, and the two reflecting areas are respectively provided at different angles with respect to a document to be read, and wherein illumination light beams exiting from the light exit surface have different focal points from each other.