| 摘要 |
A disk medium having an IC chip capable of delivering information to an external source contactlessly even if several media are stacked. In the disk medium (1B), an annular slot (6B) constituting a non-film portion without metal film is formed close to the boundary between an information non-recording area (R2) and an information recording area (R4). The area (R1) formed with the metal film is separated into an outer antenna portion (13) and a second antenna portion (15A). The second is a C-shaped member in which a central non-film area (R5) on the inner peripheral side and the annular slot (6B) are connected via a notch (15a). Signal input/output electrodes (5a, 5b) constituting the terminals of the IC chip (5) for supplying power to the antenna are connected to the metal films of the first and second antenna (13, 15A) over the annular slot (6B) at a narrow portion (6a).
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