Reducing corrugations in optical recording discs

Details Reducing corrugations in optical recording discs Reducing corrugations in optical recording discs

1997-04-23

1999-10-12

Letscher, George J.

Dynamic information storage or retrieval

Storage medium structure

Layered

G11B 370, G11B 5855

Patent

active

059663693

ABSTRACT:
An optical recording disc and a method of making such disc is disclosed. The disc has inner and outer peripheral edges, and includes a transparent substrate having a first portion corresponding to a recording area where data are recorded and a second portion corresponding to a non-recording area which extends from the recording area to a position adjacent to the outer peripheral edge of the disc. A continuous groove is formed in the substrate and extends over the first and second portions of the transparent substrate. The disc further includes a recording layer formed over the first and second portions of the transparent substrate and extending to a position so that the recording layer covers only a part of the groove in the second portion of the substrate whereby the outermost part of the groove is not covered by the recording layer.

REFERENCES:
patent: 5486396 (1996-01-01), Mizuzuki et al.
patent: 5616450 (1997-04-01), Arai et al.

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