Abstract:
Optical data storage media containing a "dark" layer structure are disclosed. Layered metals and metal oxides provide a dark background that enhances detection of changes in the data layer of the storage media. Combinations such as chromium metal and chromium oxide, and molybdenum metal and molybdenum oxide are offered as examples of suitable materials.
Abstract:
A copy protected optical recording medium sucha s that shown in figure 1, where a security means is applied between two DVD substrates, the mediumbeing accessed through the substrates to readout the DC pit structure with the top surface being metallized. The security means includes a materials able to undergo a change in optical state, such as a methylene blue and derivatives thereof.
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:
Disclosed herein are randomly marked plastic materials and articles, and methods for their fabrication. In one embodiment, a randomly marked article can comprise: a random distribution of markings within a substrate, and machine readable data and/or a data layer capable of comprising machine readable data. The substrate was formed a first plastic and a second plastic, wherein the first plastic and the second plastic comprise a sufficient difference in a property to cause the random distribution. In one embodiment, a method for fabricating an article, comprises: combining a taggant with a first plastic to form a tagged plastic; molding the article from the tagged plastic and a second plastic, wherein the article comprises a random distribution of the taggant; and mapping taggant in the article to form a map.
Abstract:
Regarding many media developed recently, the biggest issue is capacity. A high density readable only optical disc includes a substrate having pits with different lengths in accordance with unit information, wherein a depth of the pit increases as the pit length increases; and a mask layer that includes a metal oxide, or a mixture of fine metal particles and a dielectric material. The high density readable only optical disc may be used to read pits not greater than a reading resolution limit and to obtain an optimal CNR since a pit depth is varied depending on a pit length. Also, a method of the high density readable only optical disc may be used to prepare a high density readable only optical disc having an optimal pit depth in accordance with a pit length.
Abstract:
The invention concerns recyclable optical discs, method for production thereof, and a new use of paper or cardboard sheets. The discs comprise a substrate (48) having two opposite surfaces, a planar polymeric coating layer (46) on at least one of the surfaces, and a high-resolution pattern formed in the polymeric coating layer (46). According to the invention, the substrate (48) comprises a coated paper or cardboard sheet (42, 44) having a bending stiffness (ISO 2493) of 3,0 mNm or more in the machine direction and 2,0 mNm or more in the cross direction. The resulting discs may serve as an environmentally friendly and inexpensive media for limited or unlimited time storage of data.
Abstract:
Multilayer Optical Disc and Method and Apparatus for making same are proposed The technology provides increasing the number of layers in reflective optical disks of any format. The technology allows producing of multilayer optical reflective discs of any format (CD, ROM, DVD ROM, Blue Ray, HD-DVD, DVD-R, DVD-RW, etc.) using existing CD/DVD production lines with reasonable upgrading.
Abstract:
In one embodiment, a method for authenticating that a test polymer is an authenticatable polymer is disclosed wherein the authenticatable polymer comprises a substrate polymer and a thermochromic compound, the thermochromic compound having a first signal at a first temperature and at an authenticating wavelength, and a second signal at an authenticating temperature and the authenticating wavelength, the first and second signals being different, and the authenticating temperature being greater than the first temperature, the method comprising subjecting the test polymer to a stimulus sufficient to raise a portion of the test polymer to the authenticating temperature to create a heated portion, determining a test signal of the heated portion of the test polymer at the authenticating wavelength, and authenticating that the test polymer is an authenticatable polymer if the test signal is the same as an authenticating signal of the authenticatable polymer.
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.