Spiral-coated media for optical recording

Details Spiral-coated media for optical recording Spiral-coated media for optical recording

1984-03-12

1985-06-11

Newsome, John H.

Coating processes

Electrical product produced

Welding electrode

430321, 430961, B05D 306

Patent

active

045228469

ABSTRACT:
An optical data storage system is contemplated, one employing a data-modulated writing laser beam and a nonerasing reading laser beam of predetermined wavelength.
Improved optical media for such systems are described, these characterized by multiple layers whose optical characteristics and thickness are chosen to accommodate a prescribed writing and reading energy and wavelength and so provide an "anti-friction" condition for unrecorded portions of the medium and a relatively higher reflectivity for recorded portions. A preferred optical medium includes a highly reflective aluminum layer, a relatively transparent polymer spacer layer overlying the reflective layer, and an optical absorber (recording) layer overlying the spacer layer.
Overcoating structure is specified in some detail; e.g., as a "soft pad" layer (e.g., fluoropolymer) on the absorber, with a "Hard" layer (e.g., radiation-cured acrylic) laid over the "soft pad" as an outer protective overcoat. Also, the "spacer" may be rendered as such a "soft pad".

REFERENCES:
patent: 4126726 (1978-11-01), Soeding
patent: 4273802 (1981-06-01), Kamada et al.
patent: 4363844 (1982-12-01), Lewis et al.
patent: 4367245 (1983-01-01), Kishida et al.

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