Invention Grant
US4551733A Protected optical disc comprising a flexible closure element 失效
保护光盘包括柔性封闭元件

Protected optical disc comprising a flexible closure element
Abstract:
A protected optical disc adapted for optical recording and playback of information (particularly digital recording) with a rigid element carrying the recording surface, and a flexible element permeable to optical radiation, one of these two elements having the shape of a dish. At least one of the elements is provided with a central hole for receiving a driving shaft, with the joined annular portion or portions of the two elements concentric with the central hole.
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