Abstract:
The recordable optical storage medium comprises a substrate layer (11), a recording layer (12, 13), a cover layer (15), a reflecting layer (14) arranged between the recording layer and the cover layer, a first dielectric layer (16) arranged between the substrate layer and the recording layer, and a second dielectric layer (17) arranged between the recording layer and the reflecting layer. The recording layer (12, 13) comprises a first film (12) containing essentially copper being arranged on the first dielectric layer (16) and a second film (13) containing essentially silicon arranged between the first film (12) and the second dielectric layer (17). The thicknesses of the first film (12) and of the second film (13) are in particular each in a range of 2 - 20 nm, wherein the thickness of the first film (12) is larger than the thickness of the second film (13), and the thickness (d1) of the first dielectric layer (16) is larger than the thickness (d2) of the second dielectric layer (17).
Abstract:
An optical disc comprises an active disc in which information is recorded and a dummy disc for protecting the active disc, wherein the active disc and the dummy disc are bonded to form a single body, wherein the dummy disc is made of methylmethacrylate-acry-lonitrile-butadiene-styrene copolymer (MABS) resin.
Abstract:
A new class of phase change materials has been discovered based on compounds of: Ga; lanthanide; and chalcogenide. This includes compounds of Ga, La, and S (GLS) as well as related compounds in which there is substitution of S with O, Se and/or Te. Moreover, La can be substituted with other lanthanide series elements. It has been demonstrated that this class of materials exhibit low energy switching. For example, the GLS material can provide an optical recording medium with erasability 3-5 dB greater than the erasability of GeSbTe (GST) material which is the standard material for phase change memories.
Abstract:
A limited play optical storage medium for data is described which comprises a first substrate, a reflective layer, a data layer disposed between said substrate and said reflective layer; a reactive layer comprising at least one carrier, and at least one reactive material, and an optically transparent second substrate comprised of a polymethacrylate copolymer or blend comprising a polymethacrylate copolymer or homopolymer. The second substrate is disposed between the reactive layer and a laser incident surface and is tailored to provide an oxygen permeability in a range between about 0.1 Barrers and about 1.35 Barrers at 25°C.
Abstract:
A rewritable optical record carrier comprising a first substrate carrying a first recording stack of layers, which recording stack comprises, a first dielectric layer, a recording layer comprising a phase-change recording material, a second dielectric layer, and a metal mirror layer. In order to achieve a maximum difference between the reflection of the crystalline regions and the amorphous region, said first dielectric layer has a thickness d1 in the range of 20 nm to 50 nm, and said second dielectric layer has a thickness d2 according to the relation 0.0225*d2 - 2.6572*d2 + 173.3(nm) - 2.6572*d2 + 213.3(nm) when the mirror layer comprises aluminum, or a thickness d2 according to the relation 0.0191*d2 - 2.0482*d2 + 149.6 (nm) - 2.0482*d2 + 189.6(nm) when the mirror layer comprises silver.