| 摘要 |
PURPOSE:To firmly bond the first layer and the second layer without using an adhesive, by providing a light absorbing layer having a good light absorbing property with respect to visible light or non-visible light to the interface of the first and second layers. CONSTITUTION:A recording layer 3 is formed to one surface of a substrate 11 having a center hole 16 formed thereto excepting the regions corresponding to the inner and outer peripheral edges 17, 15 thereof and a colorant 19 is applied to the parts corresponding to the outer and inner peripheral edges 15, 17 of the substrate 11. Next, a substrate 12 having a recording layer 14 formed thereto in the same way is opposed to the substrate 11 and two substrates 11, 12 are united. In this state, light, laser or ultraviolet rays is allowed to irradiate the colored layers 18 formed by applying the colorant 19 to the outer and inner peripheral edges 15, 17. By this method, the colored layers absorb light energy to generate heat and the contact parts of the substrates 11, 12 at the inner and outer peripheral edges 17, 15 are heated and fused. |
