Optical recording medium

Details Optical recording medium Optical recording medium

2011-07-05

2011-07-05

Mulvaney, Elizabeth (Department: 1785)

Stock material or miscellaneous articles

Circular sheet or circular blank

C428S064400, C430S270120

Reexamination Certificate

active

07972673

ABSTRACT:
An optical recording medium is provided. The optical recording medium includes at least a reflective film and a cover layer on a substrate; main data by a combination of pit and land are recorded on the substrate; a write-once recording is made to be possible on the reflective film by irradiating a laser light; sub-data are recorded by a mark that is formed by the irradiation of laser light for the write-once recording with respect to the reflective film; a reproducing signal level at portion where said mark is formed increases for the land of specified length; the mark by which the reproduced level decreases at the portion where the mark is formed is formed for an optical disc recording medium manufactured by physical copy; the reflective film is composed of an Ag-alloy film of Ag100-xXx(0<x<100); and the X is selected from Ti, W, Ta, V, Mo, Nb and Zr.

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patent: 6841219 (2005-01-01), Nee
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patent: WO 2005/056848 (2005-06-01), None
patent: WO 2005/056849 (2005-06-01), None
patent: WO 2005/056850 (2005-06-01), None
patent: WO 2005/056851 (2005-06-01), None

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