| 摘要 |
A recording and/or reproducing apparatus for a disc-shaped recording medium having a rotary shaft and a driving pin provided at an offset position relative to this driving shaft, the rotary shaft being passed through a rotary shaft inserting opening formed in the disc-shaped recording medium and the driving pin being engaged in a driving pin engagement opening bored in the disc-shaped recording medium to set the rotational position of the disc-shaped recording medium run in rotation to record and/or reproduce information signals. The disc rotating driving unit is driven to displace the position of the driving pin from a position in which the rotary shaft inserting opening and the driving pin engagement opening in the disc-shaped recording medium are disengaged from the rotary shaft and the driving pin, respectively, at a timing when the rotary shaft and the driving pin are not engaged in the rotary shaft inserting opening and the driving pin engagement opening in the disc-shaped recording medium to prohibit the driving pin from overlapping with the rim of the driving pin engagement opening.
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