Multiple layer optical recording medium for use with two differe

Dynamic information storage or retrieval – Storage medium structure – Optical track structure

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369281, 369 94, G11B 724

Patent

active

061607878

ABSTRACT:
A double sided (or higher multiple sided) data storing compact disc for optically recorded data has data surfaces that are separated by a thin film of wavelength selective material that passes light of one frequency and reflects light of a second (or multiple) frequency. The thin film either passively relies upon the inherent interference between light signals reflected from its upper and lower surfaces or is an active material that reflects light of one frequency and transmits light of a second frequency. A further aspect of the present invention is the method for the manufacture of such a multi-surfaced disc.

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