| 摘要 |
PROBLEM TO BE SOLVED: To improve tight adhesion and to prevent peeling in spite of exertion of repetitive bending stresses on an optical ROM card by providing the card with plural optical waveguides which are held by covers and are optically split as needed and selecting the materials for core parts and clad parts. SOLUTION: A polycarbonate sheet 1 is blanked to form the core part 2 patterns constituting the plural optical waveguides of a straight shape. Next, a soln. prepd. by dissolving 5 wt.% polymethyl methacrylate and 5 wt.% urethane prepolymer into a solvent mixture composed of 15 wt.% toluene, 45 wt.% xylene, 20 wt.% ethyl acetate and 20 wt.% butyl acetate is applied on the surface of the sheet 1 to form the clad parts 3. Both surfaces of the sheet 1 coated with the clad parts 3 are held with PET films 5 as covers via UV resin adhesive layers 4. Both ends of the sheet 1 and the PET films are cut to separate the plural clad parts 2, by which the ends of the core parts 2 to execute input and output of light are exposed. |
