Patent ID: 8168940

Claim:
A light transmission module comprising: a light transmission path for transmitting light; an optical element including a light emitting and receiving surface for optically coupling with the light transmitted by the light transmission path, and being formed with a light emitting and receiving point having a function of photoelectric conversion and an electrode pad on the light emitting and receiving surface; a substrate mounted with the optical element and an electrical wiring; and an electrical connecting member for electrically connecting the electrode pad and the electrical wiring; wherein the substrate includes a wiring exposed surface where the electrical wiring is exposed; the electrical connecting member is made of solidified object of a liquid conductive material arranged to contact the electrical wiring, which is exposed at the wiring exposed surface, and the electrode pad; and a projection projecting out with respect to the light emitting and receiving surface is arranged between the electrode pad and the light emitting and receiving point.