| 摘要 |
PROBLEM TO BE SOLVED: To allow high-density mounting or miniaturization by providing an optical path changing optical member on the side surface of an optical board. SOLUTION: An optical path changing optical member is provided for once deflecting laser beam 21 which is an optical signal from the side surface of optical boards 9 and 9', which is transferred to other optical boards 9' and 9. As the optical path changing optical member, specifically a prism 17 or optical fiber, etc., is used. The prism 17, etc., is bonded to the side surface of the optical boards 9 and 9' by an optical adhesive. If the side surface of the optical boards 9 and 9' is thin, with no margin in area for bonding the prism 17, etc., a dummy board 15 of an appropriate thickness whose material is identical with clad layers 1 and 1' is inserted between optical boards 9 and 9'. With this configuration, a plurality of optical wiring layers are provided on the board comprising electric wiring, for high-density mounting or miniaturization. |
