| 摘要 |
A positioning device capable of performing accurate positioning of holograms formed on a recording medium is disclosed. The positioning device includes a rotation driving unit for rotating a disk-shaped recording medium in a peripheral direction, a horizontal driving unit for moving the recording medium in a horizontal direction. The positioning of the recording medium is performed by the rotation driving unit and the horizontal driving unit. The rotation driving unit includes a central driving unit for rotating the recording medium on a central portion and a peripheral driving unit for rotating the recording medium at a peripheral edge. The peripheral driving unit includes a rotating part which is rotatable separately from the central driving unit. The rotating part is formed in the shape of a disk whose diameter is smaller than the recording medium and is disposed in the horizontal direction to the disk-shaped recording medium. As a peripheral edge of the rotating part abuts the peripheral edge of the recording medium, with the peripheral rotation, the peripheral driving unit rotates the recording medium.
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