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

G - Physics

11

B

352/32.4

G11B 7/00 (2006.01) G11B 7/26 (2006.01)

Patent

CA 1249884

17 ABSTRACT: Disc-shaped information carrier and method of manufacturing it. 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 sub- strate 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.

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