| 摘要 |
An antenna comprises a dielectric member (21), an antenna pattern (22) formed on one surface of the dielectric member (21), and a ground pattern (23) formed on the other surface of the dielectric member. A part or the whole of the antenna (2) is implanted in a dielectric layer (11 (11A)) on the side from which a laser beam does not come in of an optical recording medium (1) symmetrically having a metal layer (12 (12A,12B)) reflecting the laser beam and the dielectric layer (11 (11A,11B)), thereby to provide a radio tag antenna structure for an optical recording medium which is simple, is small-sized, and can secure necessary reading performance. |
