| 摘要 |
PURPOSE:To prevent a cobwebbing phenomenon from occurring by providing a taper part in a direction in which the thickness of a substrate is reduced toward the outer periphery at the outer peripheral edge part on a recording layer side. CONSTITUTION:The title medium has a pair of substrates 1 having a taper part 2 in a direction, in which the thickness is reduced toward the outer periphery at the outer peripheral edge part of surface sides arranged so as to face each other, a recording layer 4 formed on the surface side facing the substrate 1, and a hot melt agent 3 which is filled between the substrate 1, includes the recording layer 4, and closely sticks a pair of the substrates 1. For this at the time of formation, the hot melt agent 3 protruded from coated surfaces stays at the taper part 2, and simultaneously, the taper part 2 brings the increasing effect of actual clearance. Thus, the generation of the cobwebbing phenomenon of the hot melt agent can be suppressed, the lack of an outward appearance or the generation of characteristic deterioration can be prevented, and a yield can be increased. |
