Patent ID: 7212713

Claim:
An optical transmission substrate comprising: a first substrate; a plurality of optical waveguides each of which has a core and clad covering a periphery of the core and extends on an upper surface of the first substrate; a second substrate provided parallel to the first substrate so that a lower surface thereof contacts an upper surface of the optical waveguides; a plurality of reflection surfaces each of which is provided on a cross section of the core at an end of the optical waveguides and reflects light, wherein said light advances through the core of the optical waveguides, toward the second substrate; a plurality of light guides positioned in the second substrate, wherein said light guides guide said light, which was reflected toward the second substrate, toward an upper surface of the second substrate from a position closer to the core than an upper surface of the clad; and a connector connected to said plurality of light guides, wherein said connector is inserted into an opening penetrating the second substrate, and wherein said connector aligns the light guides with positions receiving light reflected toward the second substrate by the reflection surfaces.