Optical memory disc manufacture

Details Optical memory disc manufacture Optical memory disc manufacture

1989-10-23

1990-09-18

Nguyen, Nam X.

Chemistry: electrical and wave energy

Processes and products

Coating, forming or etching by sputtering

20419214, 20419215, 20419226, C23C 1434

Patent

active

049576038

ABSTRACT:
A method of making an optical memory disc replica that includes the steps of injection molding a PMMA substrate having a surface with information recorded thereon as a series of surface undulations, and depositing a film of optically reflective metallic construction over the information surface such that the information recorded on the surface may be optically read through the substrate as a function of reflectivity from the film. The reflective film is sputter-deposited onto the information surface in the presence of carbon at said surface in excess of that in the polymer molecular structure by subjecting the surface to a plasma that includes carbon-rich ions to prepare the surface for chemical bonding with the metal of the film and the underlying substrate.

REFERENCES:
patent: 4374717 (1983-02-01), Drauglis et al.
patent: 4525261 (1985-06-01), Hotta et al.
patent: 4551216 (1985-11-01), Argyo
patent: 4663008 (1987-05-01), Takeoka et al.
patent: 4802967 (1989-02-01), Kittler

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