OPTICAL/ELECTRICAL HYBRID WIRING BOARD AND ITS MANUFACTURING METHOD

摘要

AN OPTICAL FIBER-EMBEDDED LAYER IS PROVIDED AS ONE LAYER OF A MULTIPLE-LAYERED ELECTRICAL WIRING BOARD COMPRISING A MOTHER BOARD (20-1) HAVING AN ELECTRICAL CIRCUIT MOUNTED THEREIN. THE OPTICAL FIBER-EMBEDDED LAYER IS FORMED THROUGH ITS SURFACE WITH AN APERTURE TO EXPOSE FIRST ENDS OF THE OPTICAL FIBERS (25F) WHERE A 45O REFLECTING SURFACE IS PROVIDED SO THAT THE LIGHT EXITING FROM THE OPTICAL FIBERS (25F) IS REFLECTED IN A DIRECTION ORTHOGONAL TO THE PLANE OF THE WIRING BOARD AND INPUT INTO THE ENDS OF OPTICAL FIBERS AT AN END FACE OF A DAUGHTER BOARD (20-2). LIGHT EXITING FROM THE ENDS OF OPTICAL FIBERS (25F) AT THE END FACE OF THE DAUGHTER BOARD (20-2) AND ENTERING THE 45O REFLECTING SURFACE MAY BE INPUT INTO THE OPTICAL FIBERS IN THE OPTICAL FIBER-EMBEDDED LAYER.