Patent ID: 8442366

Claim:
An optical waveguide for a touch panel, comprising: cores; and an over cladding layer formed so as to cover the cores, wherein the optical waveguide are provided along a periphery of a display screen of a display of the touch panel, wherein the cores include light-emitting cores, each having an end portion positioned in a first side portion of the display screen of the display, wherein each of the end portions of the light-emitting cores is formed as a lens portion, wherein the lens portion has a shape in plan view including a tapered portion whose width gradually increases toward an end surface on the light-emitting side and an elliptical arc portion which is formed by bulging outwardly from a tip side of the tapered portion, so as to be in a shape of an elliptical arc, wherein the elliptical arc portion has a major axis direction aligned in a longitudinal direction of the tapered portion, wherein a longitudinal length (L) of the lens portion in μm, a taper angle (α) of the tapered portion in degrees, and a major axis radius (a) in am of an ellipse constituting part of the elliptical arc portion satisfy one of the following conditions (1) and (2): When L/a< 3,4°≦α≦20° (1) When L/a≧ 3,4°≦α≦10° (2).