Dry bonded digital versatile disc

Details Dry bonded digital versatile disc Dry bonded digital versatile disc

1997-04-25

1999-11-09

Letscher, George J.

Dynamic information storage or retrieval

Storage medium structure

Layered

G11B 370

Patent

active

059827408

ABSTRACT:
A digital versatile disc ("DVD") for storing digital or digitized information that includes two sub-discs. Each sub disc has an outer peripheral edge, a top surface, a bottom surface, and a bore having a second peripheral edge. The two sub-discs are bonded together by a layer of dry film adhesive which is in contact with the bottom surface of the first sub disc and the top surface of the second sub-disc. The layer of dry film adhesive is spaced a distance from the second peripheral edges of the bores of the sub-discs. A weld located along the peripheral edges of the bores of the sub-discs provides bonding and structural support to the DVD. A hub or central area which is substantially free of any dry film adhesive is located between the weld and the layer of dry film adhesive. The use of a dry film adhesive to bond the component parts of the DVD eliminates many of the deficiencies of hot-melt and UV-curable adhesive bonding methods, particularly the problem of entrapping in the adhesive.

REFERENCES:
patent: 4450553 (1984-05-01), Holster et al.
patent: 5759332 (1998-06-01), Itoigawa et al.

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