Light guide, illuminating device, and image reading apparatus

摘要

A light guide having: a splitting section dividing light derived from a light source into at least two beams of light; and at least two light guiding sections causing the light from the splitting section to propagate in a predetermined length direction, the light guiding sections being arranged side by side in a predetermined width direction with the splitting section disposed therebetween, wherein the light guiding section includes: a reflective section reflecting the light, the reflective section being provided along the length direction; and an emission surface emitting the light reflected by the reflective section as a linear beam of light, the emission surface being positioned opposite to the reflective section, and a cross section of the splitting section perpendicular to the length direction decreases in dimensions both in the width direction and a height direction.

主权项

1. A light guide comprising:
a splitting section dividing light derived from a light source into at least two beams of light; and at least two light guiding sections causing the light from the splitting section to propagate in a predetermined length direction, the light guiding sections being arranged side by side in a predetermined width direction with the splitting section disposed therebetween, wherein, the light guiding section includes:
a reflective section reflecting the light, the reflective section being provided along the length direction; andan emission surface emitting the light reflected by the reflective section as a linear beam of light, the emission surface being positioned opposite to the reflective section, anda cross section of the splitting section perpendicular to the length direction decreases in dimensions both in the width direction and a height direction, when progressively viewed at least at some positions in the length direction, the height direction being a component of a direction in which the linear beam of light is emitted from the emission surface, the component being vertical to the length direction and the width direction.