Optically readable record carriers

Details Optically readable record carriers Optically readable record carriers

1992-05-22

1994-04-19

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369283, 369286, 3461351, G11B 726

Patent

active

053053010

ABSTRACT:
A record carrier has a spiral track in which sound and/or video information is stored formed on a transparent substrate and covered by a reflecting layer of metallic material for reflecting a reading beam. The metallic layer does not extend to the inner and/or the outer edge portion of the substrate and is covered by a protective layer. The protective layer is extended to the inner and/or the outer edge portion of the substrate so as to seal the metallic layer for preventing oxidation thereof.

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patent: 4432002 (1984-02-01), Ando
IBM Technical Disclosure Bulletin, vol. 22, No. 3, Aug. 1979/Bruce et al; "Video Disk With Updating Feature".

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