| 摘要 |
PROBLEM TO BE SOLVED: To provide a disk that can update information according to a signal from the outside such as an electromagnetic wave, and, furthermore, to reduce unnecessary vibration being generated by the amount of the shift of center of gravity of the disk at high-speed rotation. SOLUTION: On a disk 61, an antenna part 62 that can receive information and/or power, and chips 63a, 63b, and 63c for storage that transfers the received information to the disk 61 and updates the information are arranged. Furthermore, to reduce the amount of the shift of center of gravity of the disk 61, on the disk 61, a counter balance for balancing with the chips 63a, 63b, and 63c for storage, a label part 64, the antenna part, and/or other chips for storage are arranged. |
