Signal transmission device

A signal transmission device constructed to transmit a signal, the signal transmission device comprising:

• a base plate structured to have an optical waveguide formed internally, an opening formed to expose the optical waveguide, and a mounting surface provided to allow an electronic part to be mounted thereon at a different position from where the opening is formed;
• and
• a photoelectric converter-sealed member placed in the opening of the base plate to include a photoelectric conversion module for converting between an electric signal and a light signal and provided by sealing at least the photoelectric conversion module with a predetermined material to expose at least part of a wiring from the photoelectric conversion module on a substantially identical plane with an opening end face of the opening of the base plate,
• wherein the opening of the base plate is either a recess formed in a direction of depth of the base plate from the mounting surface for mounting the electronic part or a through hole pierced from the mounting surface to a rear face of the base plate opposed to the mounting surface, and
• the photoelectric converter-sealed member has a sealer made of the predetermined material, and a module mount arranged on a face of the sealer on the same side as the mounting surface and configured to have the photoelectric conversion module and the wiring attached thereto and to work in cooperation with the predetermined material to seal the photoelectric conversion module.