| 摘要 |
This specification discloses a card-like optical information recording medium comprising a card-like base body, and concentric circular or spiral information tracks provided on the base body and capable of optically recording and/or reproducing information thereon. The specification also discloses an apparatus for recording and/or reproducing information on such card-like optical information recording medium which comprises a turn table rotatable with the card-like medium being placed thereon, a clamp mechanism for positioning and fixing the card-like medium on the turn table, and an optical head for applying a light beam to the card-like medium while moving radially of the rotation, thereby effecting recording and/or reproduction of information concentrically or spirally.
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