Optical data storage medium and use of such medium

Details Optical data storage medium and use of such medium Optical data storage medium and use of such medium

2007-05-22

2007-05-22

Neyzari, Ali (Department: 2627)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S288000, C428S064400

Reexamination Certificate

active

10501416

ABSTRACT:
An optical data storage medium (20) for recording by means of a focused radiation beam (29) is described. The radiation beam having a wavelength λ enters through an entrance face (28) of the medium during recording. The medium has a substrate (21) with a surface (24) including a guide groove with a depth g. An inverted stack of layers is present on the substrate (21) including a reflective layer (24a) with a complex refractive index ñMλ=nMλ−i*kMλ, in substantial conformity with the surface (24) of the substrate, a transparent layer (22) through which the radiation beam (29) is incident with a complex refractive index ñTλ=nTλ−i*kTλand a recording layer (25) of a material having a complex refractive index ñRλ=nRλ−i*kRλand having a thickness dRGin the groove portion and a thickness dRLin the portion between grooves. The recording layer is interposed between the reflective layer (24a) and the transparent layer (22). When 0.25/(3.0+kMλ2)+0.17<g*nT/λ<0.22/(3.0+kMλ2)+0.45 and 0.2<(dRG−dRL)/g<0.5 and 0<dRG<λ
Rλand kRλ<0.5 and 2<nRλ<2.6 the sign of the push pull tracking signal is reversed. In such way the inverted recording stack is tracked properly without modifications to the optical drive and backwards compatibility is achieved.

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patent: 2006/0240357 (2006-10-01), Martens et al.

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