Disc-shaped information carrier and method of manufacturing it
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United States of America Patent
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May 24, 1988
Issued Date -
N/A
app pub date -
Sep 9, 1986
filing date -
Mar 29, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to disc-shaped information carriers which can be read optically in reflection and which contain an annular information zone which is bounded by a concentric inner zone and a concentric outer zone. The information carrier consists of a transparent substrate and has a readout side and opposite side (back) which at least in the information zone has a reflective coating. The light entering the outer zone from the readout side is reflected at least partially diffusely or absorbed by the information carrier. In this way, manufacturing defects such as, for example, inclusions, inhomogeneities etc. are at least partially masked or concealed.
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