| 摘要 |
An optical waveguide device for a touch panel, including: a body; a plurality of cores formed on a surface of the body; and an over-cladding layer formed on the surface of the body to cover the plurality of cores, in which the over-cladding layer includes an end portion which covers each of the end surfaces of the cores, and the end portion of the over-cladding layer is formed as a lens portion. The lens portion includes a surface formed as an arcuately curved surface in side view which bulges outwardly, in which a distance (L) from the end surface of the cores to the center of curvature of the arcuately curved surface and the radius (R) of curvature of the arcuately curved surface satisfy the following condition (a): (L/2)−0.3<R<(L/2)+0.3  (a) where L in mm, and R in mm.
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