Method for making a composite video disc

Details Method for making a composite video disc Method for making a composite video disc

1979-12-26

1982-01-26

Cardillo, Jr., Raymond F.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369283, 369286, 3461351, 346137, 301 5B, 73 66, H04N 576, G11B 700

Patent

active

043131905

ABSTRACT:
A symmetrical video disc structure and method for making the structure are described. The video disc structure is symmetrical about a plane passing through a core member and equidistant and parallel to a first information bearing surface and a second information bearing surface carried by the core. First and second reflective layers are formed over the first and second information bearing surfaces, respectively. The combination of two reflective layers, so oriented, operates as a vapor barrier for preventing the absorptions of water into the core member of the symmetrical video disc structure situated between the two vapor barriers. First and second protective layers are formed over the first and second reflective layers, respectively. The thickness of the first and the second protective layers is maintained the same over the entire area of the video disc structure. The use of protective layers of the same thickness in combination with the vapor barriers employed for isolating a central core, provides a video disc structure in which the moisture absorption ratio is balanced to avoid warpage.

REFERENCES:
patent: 4225873 (1980-09-01), Winslow
Handbook of Adhesives, 2nd ed., Edited by Irving Skeist, .COPYRGT.1977, Von Nostrand, p. 297.

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