Optically readable disc with a centering member fixed to a trans

Details Optically readable disc with a centering member fixed to a trans Optically readable disc with a centering member fixed to a trans

1991-10-28

1993-06-01

Weinhardt, Robert A.

Dynamic information storage or retrieval

Storage medium structure

Special groove

369271, 369282, 369290, G11B 724, G11B 2300

Patent

active

052166643

ABSTRACT:
A transparent substrate has an information layer on an entirely flat side, and a centering member on the other side adapted to cooperate with centering means of an apparatus for inscribing and/or reading the disc. The centering member may be glued in place and have an aperture for engagement by an apparatus spindle.

REFERENCES:
patent: 3430966 (1969-03-01), Gregg
patent: 4308545 (1981-12-01), Lehureau et al.
patent: 4365258 (1982-12-01), Geyer et al.
patent: 4477894 (1984-10-01), Clurman
patent: 4510508 (1985-04-01), Janssen
patent: 4862447 (1989-08-01), Opheij
patent: 4899329 (1990-02-01), Sleegers et al.

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