Light guide

The utility model relates to a light guide member, comprising an optical groove which is formed along the length of the light guide member and diffuses light incident from a light source, and the optical groove can be formed in a manner that the optical groove gradually changes from a first shape to a second shape along with the distance from an incident part, so that a light-emitting area can beenlarged. 本实用新型涉及一种光引导件，可包括沿光引导件的长度形成，并扩散从光源入射的光的光学槽，其中，所述光学槽可以以随着从入射部远离从第一形状渐进地变为第二形状的方式形成，从而可扩大发光区域。