Disc-shaped information carrier and method of manufacturing it

Details Disc-shaped information carrier and method of manufacturing it Disc-shaped information carrier and method of manufacturing it

1986-09-09

1988-05-24

Powell, William A.

Dynamic information storage or retrieval

Storage medium structure

Specific disc profile

156643, 156654, 1566591, 156663, 156645, 219121LM, 264 17, 264220, 428156, G11B 370, G11B 584, B44C 122, C03C 1500

Patent

active

047470933

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.

REFERENCES:
patent: 3687664 (1972-08-01), Broadbent
patent: 3787274 (1974-01-01), Genma
patent: 3905817 (1975-09-01), Bakewell

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