| 摘要 |
The cassettes, which have L-shaped shelves (1, 2) with the short bar pointing upwards, move vertically down past the light from two parallel laser beams (11, 12). Depending on the type of cassette, one or the other of the beams will be interrupted by the objects (3, 4) on the shelves and the short bars of the L-shaped shelves, allowing the cassette type to be recognized. An Independent claim is also included for the following: The method of distinguishing between different types of cassettes with disk-shaped object deposited on their shelves.
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