Patent ID: 8428403

Claim:
An optical sensor module, comprising: an optical waveguide unit; and a substrate unit, the optical waveguide unit and the substrate unit being coupled to each other, wherein the optical waveguide unit includes an under cladding layer, a linear core for an optical path provided on a surface of the under cladding layer, an over cladding layer covering the core, and a pair of left-hand and right-hand fitting portions for fitting engagement with the substrate unit, the fitting portions being provided in part of the over cladding layer lying in an appropriate position relative to a light-transmissive surface of the core, wherein the substrate unit includes a substrate, an optical element mounted on a predetermined portion of the substrate, and to-be-fitted portions for fitting engagement with the fitting portions of the optical waveguide unit, the to-be-fitted portions being provided in part of the substrate lying in an appropriate position relative to the optical element, and wherein the coupling between the optical waveguide unit and the substrate unit are provided in conditions where the to-be-fitted portions provided in the substrate unit are in fitting engagement with the fitting portions provided in the optical waveguide unit and where the substrate unit is bowed in a direction such that the optical element is moved toward the light-transmissive surface of the core.