| 摘要 |
PURPOSE:To provide a forgery proof optical card which can be distinguished from a forgery. CONSTITUTION:In an optical card, a card backing 4 is laminated on the surface of an optical recording material layer 2 for optical recording which is formed on one side of a light transmitting substrate 1 through an adhesive layer 3, and a transparent protective layer 5 and a surface hardening layer 6 are laminated on the other side of the substrate 1. In this card, printing layers 7a, 7c containing a kind of information which can not be detected by eyes are placed on the part of the card backing 4 corresponding to the optical recording material layer 2. |
