| 摘要 |
A playback unit includes a control unit (40) adapted to displace, on guide means (2), as a function of commands received from a disc management unit (41), an optical unit (3) equipped with a reproducing and/or writing head (4), between two discs (5-i) each having an information zone (ZL) defined by a start region (DZ) and an end region (FZ). The information zone (ZL) may be a reproducing and/or writing zone. The device likewise includes detection apparatus (16-18, 23, 24, 27, 37, 38) adapted to indicate to the control unit (40) the passage of the optical unit (3) at at least two passage points (47-i, 48-i) respectively associated with positioning of the head (4) substantially facing the end of zone region (FZ) and an intermediate region (RI) of the information zone (ZL) of each disc. The control unit (40) is adapted to vary the speed of displacement of the optical unit (3) as a function of the passage point detected and the commands received, enabling minimization of the time necessary for the optical unit (3) to pass from a track of information on one of the discs to a track of information on the other disc.
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