Patent ID: 6877912

Claim:
An electro-optical circuit board, comprising: a plurality of daughter boards having electrical circuits, on which an optical transmit/receive module and a plurality of electrical circuit chips, both of which are integrated, are mounted; and a motherboard having electrical circuits and connected to the plurality of the daughter boards, wherein an electrical signal outputted from the electrical circuit chip of one of the plurality of the daughter boards is converted into an optical signal through the optical transmit module, transmitted to an optical waveguide of the motherboard through an optical waveguide of the daughter board and then transmitted to the optical receive module through an optical waveguide of the other daughter board and wherein the optical transmit/receive module comprises: a metal bench having a trench at its given portion; a high-speed board attached below the metal bench except for the trench and having an electrical circuit connected to the daughter board; a driving unit/receiving unit for converting the optical signal into an electrical signal, and vice versa, said driving unit/receiving unit being attached within the trench and electrically connected to the high-speed board by means of a bond wire; an optical source/optical detector installed near the high-speed board and electrically connected to the driving unit/receiving unit by means of a bond wire; and an optical waveguide attached below the metal bench so that a reflecting surface is mated with an aperture of the optical source/optical detector.