Patent ID: 7805036

Claim:
An optical waveguide device for a touch panel, comprising: a body; a plurality of cores formed on a predetermined portion of a surface of said body, the plurality of cores including a light-emitting core and a light-receiving core; and an over-cladding layer formed on the surface of said body to cover said plurality of cores, said optical waveguide device being provided along a peripheral portion of a display screen of a display of the touch panel, said light-emitting core including an end surface positioned in a first side portion of the display screen of said display, said light-receiving core including an end surface positioned in a second side portion of the display screen of said display, said over-cladding layer including an end portion which covers each of the end surface of the light-emitting core and the end surface of the light-receiving core, said end portion of the over-cladding layer being formed as a lens portion, said lens portion including a surface formed as an arcuately curved surface in side view which bulges outwardly, wherein a distance (L) from the end surface of each of said light-emitting core and said light-receiving core to the center of curvature of the arcuately curved surface in side view and the radius (R) of curvature of the arcuately curved surface in side view satisfy the following condition (a): ( L/ 2)−0.3 <R <( L/ 2)+0.3 (a) where L in mm, and R in mm.