Optical disc unit and method and apparatus for writing and/or re

Details Optical disc unit and method and apparatus for writing and/or re Optical disc unit and method and apparatus for writing and/or re

1984-02-16

1987-06-09

Cardillo, Raymond F.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369275, 346137, 360102, G11B 724, G11B 1732

Patent

active

046725997

ABSTRACT:
An improved method of optically writing and/or reading high density information involves: (1) predeterminedly positioning a flat, uniformly thick, flexible, optical disc with respect to an axis of rotation; (2) rotating the disc on such axis at a high speed and in a predeterminedly spaced relation to a predeterminedly shaped, smooth, featureless reference surface and (3) coupling a central region between the disc and reference surface to an ambient gas source. Related apparatus and disc configurations, including embodiments having flexible disc covers, also are disclosed.

REFERENCES:
patent: 4002826 (1977-01-01), Iemenschot
patent: 4038663 (1977-07-01), Day et al.
patent: 4252327 (1981-02-01), Elliott et al.
patent: 4447899 (1984-05-01), Geyer et al.
patent: 4530082 (1985-07-01), Howe et al.

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