OPTICAL SCANNING DEVICE

摘要

The invention relates to an optical scanning device for scanning an information carrier comprising a plurality of information layers which optical properties depend on a potential difference applied between two electrodes. The optical scanning device comprises a rotating part (301, 305) comprising means (301) for receiving the information carrier. The receiving means comprise a plurality of contacts (311-318) for connecting the electrodes. The rotating part further comprises receivers (321-324), each receiver corresponding to a given information layer. The optical scanning device further comprises a fixed part comprising an energy source (300) adapted to transfer energy to the receiver corresponding to a selected information layer. The rotating part comprises means for applying a potential difference between the contacts connected to the electrodes corresponding to the selected information layer.