Dynamic information storage or retrieval – Storage medium structure – Specific disc profile
Patent
1986-03-24
1988-02-16
Powell, William A.
Dynamic information storage or retrieval
Storage medium structure
Specific disc profile
156643, 156645, 156654, 1566591, 156663, 219121LM, 264 11, 264220, 428156, G11B 370, G11B 584, B44C 122, C03C 1500
Patent
active
047260068
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 an 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.
REFERENCES:
patent: 4282311 (1981-08-01), Dinardo
patent: 4544443 (1985-10-01), Ohta
Benne Karsten
Koop Hermann
Schuddekopf Hans
Polygram International Holding B.V.
Powell William A.
Spain Norman N.
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