Patent ID: 7828018

Claim:
A light diffusing yarn having a predetermined diameter or width and exhibiting a light transmission property or a light reflection property, wherein a surface of the light diffusing yarn has a plurality of ridges arranged substantially in parallel and close to each other, wherein each ridge has a cross section constituting at least a part of a circle and has a surface substantially including a mirror surface, wherein the light diffusing yarn diffuses light incident on the plurality of ridges in a circular conical surface-like form or a half-circular conical surface-like form having a center axis passing through the incident point of the light and parallel to the plurality of ridges, wherein the light diffusing yarn has a twisted configuration such that a direction of a center axis of diffused light incident continuously changes along the longitudinal direction of the light diffusing yarn, and wherein a twist frequency of the twisted configuration of the light diffusing yarn is more than one twist in a length of five times the predetermined diameter or width of the light diffusing yarn.