| 摘要 |
PROBLEM TO BE SOLVED: To facilitate manufacture and to make information rewriting and alteration difficult by covering plural optical waveguides which are held by covers and are optically parted according to need with clad layers via thermally irreversible thermosensitive layers which are degraded in transmittance by heating of core parts. SOLUTION: A polycarbonate sheet 1 is blanked to form the core part 2 patterns constituting the plural optical waveguides having bent parts. A soln. prepared by dissolving two kinds of thermosensitive materials is applied on the surfaces of the core parts 2 and is dried, by which the thermosensitive layers 3 are formed. Next, both surfaces of the sheet covered with the thermosensitive layers 3 are held by PET films 5 constituting covers via UV resin adhesives added with carbon constituting the clad layers 4. Both ends of the sheet 1 and the PET films 5 are cut to separate the plural core parts 2 and to expose the ends of the core parts 2 for light input and output. When the optical waveguides are heated by a hot head, the thermosensitive layers 3 are changed to black and the optical waveguides may be optically parted. The alteration of the once inputted information is thus made difficult. |
