Dynamic information storage or retrieval – Storage medium structure – Adjuncts or adapters
Patent
1992-05-11
1993-07-06
Levy, Stuart S.
Dynamic information storage or retrieval
Storage medium structure
Adjuncts or adapters
369271, 360135, G11B 2300, G11B 1702
Patent
active
052260330
ABSTRACT:
An optical disc (2) equipped with a hub (5) having a centering hole into which a spindle shaft of a disc driving mechanism is inserted, wherein a centering hole portion of the hub is provided with a centering hole reinforcing material (6) excellent in abrasion resistance and smoothness or a member (14) having a central hole is formed of a resin excellent in abrasion resistance and smoothness. Reinforcing ring (6) includes a metal layer plated on the peripheral portion of the centering hole, and the metal layer is impregnated with fluoric resin.
REFERENCES:
patent: 4660119 (1987-04-01), Kato et al.
patent: 4743994 (1988-05-01), Kato et al.
patent: 4827470 (1989-05-01), Odawara
patent: 4829510 (1989-05-01), Takahashi
patent: 4982399 (1991-01-01), Odawara
patent: 4983439 (1991-01-01), Saito
Levy Stuart S.
Rhoa Joseph A.
Shaw, Jr. Philip M.
Sony Corporation
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