Disc-shaped, optically-readable information carrier having a protective edge and/or center part
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United States of America Patent
Stats
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Dec 30, 1986
Grant Date -
N/A
app pub date -
Mar 30, 1984
filing date -
Jun 20, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
High storage density, optically-readable information carriers not only require a read-out side free of contaminants or dust for a faultless reading, but must also be protected against unintentional scratching when being handled on this side. For protection against scratches that usually occur due to dislocation of a disc deposited on its support, concentric elevations are provided that are structured under given conditions by clearances on the read-out side in the edge region and in the central region of the disc outside of the information structure which fills a concentric annular surface. The disc is able to slide on the elevations when deposited on the support without the annular surface, provided with the microstructure, coming into contact with the support.
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