Sumitomo Bakelite Company Limited

Shinsuke Terada

Koji Choki

An optical waveguide structure containing a plurality of core portions for transmitting light (L), in which adjacent core portions are arranged with substantially parallel central axes, and the optical paths of the light (L) that is transmitted through the adjacent core portions are in opposite directions, wherein each core portion has a tapered section in which the area of the cross-section in a direction substantially perpendicular to the central axis decreases gradually in the direction of the optical path of the light (L). A highly reliable electronic device containing the optical waveguide structure is also provided.

Optical waveguide structure and electronic device

An optical waveguide film includes at least one optical waveguide area having an X-direction and a Y-direction orthogonal to the X-direction. Such an optical waveguide film includes a plurality of core portions arranged side by side within the same layer so as to extend along the X-direction, each of the core portions having side surfaces, and the core portions adjoining to each other in the Y-direction being arranged through a gap therebetween; and a plurality of cladding portions provided so as to cover the side surfaces of each of the core portions, each of the cladding portions formed of a resin having an optical refractive index smaller than that of each of the core portions, and the cladding portion between the adjoining core portions providing each gap. In the optical waveguide film, a size of the gap between the adjoining core portions varies along the X-direction in at least a part of the optical waveguide area. This makes it possible to precisely match a gap between core portions in a cut end surface with a desired value by selection of cutting positions of the optical waveguide film even when the optical waveguide film is shrunken.

Optical waveguide film, laminated type optical waveguide film, optical waveguide, optical waveguide assembly, optical wiring line, optical/electrical combination substrate and electronic device

Growing community of inventors

Utsunomiya, Japan

Shinsuke Terada