Abstract:
High sensitive organic dye-in-polymer (DIP) medium for write-once-read-many (WORM) optical discs with fluorescent reading. The medium consists of a fluorescent color means, capable of absorbing writing radiation produced by a laser, a compound capable of generating free radicals upon influence of heat produced by the writing radiation and a polymer capable of producing a translucent film enabling high quantum yield of the fluorescence induced in the color means. The color means can be selected from xanthene dyes of the eosine and rhodamine groups, acridine, oxazine, azine, peylene, violanthrone, cyanine, phtalocyanine, indigoide colors and porphyries. The free radicals generating compound can be chosen from the group of compounds comprising azo and diazoi compounds or peroxyde compounds. The film producing polymer can be selected from the group of compounds comprising cellulose ethers, vinyl resins or acrylic resins.
Abstract:
The present invention relates to a multi-stack optical information carrier for recording information by means of an optical beam, said optical information carrier comprising - a substrate layer (S), - at least two recording stacks each comprising a recording layer (P1-P7),- at least one spacer layer (R) separating the at least two recording stacks, and- a cover layer (C). In order to improve the sensitivity during writing it is proposed according to the present invention that the recording layers (P1-P7) include a thermochromic material having temperature-dependent optical characteristics for selectively improving the sensitivity of the addressed recording layer (P1-P7) during recording and/or read-out.
Abstract:
An optical information recording medium where data is recorded at high density and at high speed, a method for recording/reproducing such an optical information recording medium, and an optical pickup. Data is recorded/reproduced on/from an optical information recording/recorded medium having a track pitch Tp: 1.0 mu m
Abstract:
High sensitive organic dye-in-polymer (DIP) medium for write-once-read-many (WORM) optical discs with fluorescent reading. The medium consists of a fluorescent color means, capable of absorbing writing radiation produced by a laser, a compound capable of generating free radicals upon influence of heat produced by the writing radiation and a polymer capable of producing a translucent film enabling high quantum yield of the fluorescence induced in the color means. The color means can be selected from xanthene dyes of the eosine and rhodamine groups, acridine, oxazine, azine, peylene, violanthrone, cyanine, phtalocyanine, indigoide colors and porphyries. The free radicals generating compound can be chosen from the group of compounds comprising azo and diazoi compounds or peroxyde compounds. The film producing polymer can be selected from the group of compounds comprising cellulose ethers, vinyl resins or acrylic resins.
Abstract:
An optical recording medium comprising at least a recording layer (2), a recording auxiliary layer (5), a reflecting layer (3) and a protective layer (4) provided on a transparent substrate (1) in this order. The recording layer and the recording auxiliary layer are mainly made of an organic dye. Recording and/or reproduction can be performed with a laser beam having a wavelength lambda 1 or with a laser beam having a wavelength of lambda 2 shorter than the wavelength lambda 1. The recording layer has a spectroscopic absorbance of 5 to 35 % for the wavelength lambda 1 and 15 % or more for the wavelength lambda 2. The recording auxiliary layer has a peak of the spectroscopic reflectance in the vicinity of the wavelength lambda 2.
Abstract:
An optical recording medium comprising at least a recording layer provided on a light transmitting substrate having grooves and a pre-pit-formed land, characterized in that the land has a sectionally rectangular or trapezoidal shape having an upper surface and side walls and a specified land height (h1), and the pre-pit is formed to have boundary walls having a specified height (h2) and located in approximately land-width-direction center and between adjacent grooves. The optical recording medium can provide address information and disk rotation control information accurately, is excellent in productivity, can record signals at high density, and can reproduce signals excellent in quality.
Abstract:
An optical information recording medium capable of high-density recording at least two times that of a current CD-R by elaborately designing the shape of a pre-groove, wherein a recording layer is provided on a translucent substrate in which a spiral pre-groove is formed, a track pitch Tp of the pre-groove is 1.0 mu m ≤ Tp ≤ 1.2 mu m, and an angle of inclination Ga of the side wall of the pre-groove is 30 DEG ≤ Ga ≤ 70 DEG .
Abstract:
An optical recording medium comprising a substrate and formed thereon an organic dye layer as a recording layer, wherein the recording layer contains at least one benzbisazole compound represented by the general formula (1). [In the formula, substituents X and Y each independently represents aryl or heteroaryl; rings A and B each independently represents an oxazole ring or thiazole ring; and Q and Q each independently represents hydrogen, halogeno, or alkyl; provided that the aryl or heteroaryl groups respectively represented by the substituents X and Y each independently may be substituted by halogeno, hydroxyl, cyano, amino, (un)substituted alkyl, aralkyl, aryl, alkenyl, alkoxy, aralkyloxy, aryloxy, alkenyloxy, alkylthio, aralkylthio, arylthio, alkenylthio, mono-substituted amino, di-substituted amino, acyl, alkoxycarbonyl, aralkyloxycarbonyl, aryloxycarbonyl, alkenyloxycarbonyl, mono-substituted aminocarbonyl, di-substituted aminocarbonyl, acyloxy, or heterocycle.]
Abstract:
In addition to a cationic dye and at least one substance which functions as a quenching agent, the inventive recording medium contains a stabiliser in order to increase the stability of the optical data storage device, which has a recording layer consisting of such a recording medium. Said stabiliser is a phenol with one or more hydroxy groups which is advantageously present in the recording medium in the form of a phenolate ion and which forms part of the anions for the dye cations. In addition, the recording medium can also contain an anionic, metallo-organic thiolene complex which replaces a usual quencher and forms another part of the anions for the dye cations.
Abstract:
The invention relates to recording layers of optical data storage devices, these layers containing dyes and at least one stabiliser. The at least one stabiliser is an amino-derivative, a phenol derivative, a phosphite, a thio(dipropionic acid ester), a lead, calcium, zinc, or cadmium salt or an organotin compound. The at least one stabiliser is present in the recording layers in quantities of 0.1-70 % in relation to the weight of the dyes and produces a general increase in the durability of the optical data storage devices and an increase in the evenness and homogeneity of the recording layers.