SU1190405A1 - Method of manufacturing optical information medium - Google Patents

Abstract

A METHOD OF MANUFACTURING AN OPTICAL INFORMATION MEDIA, in which a metal layer is applied to the substrate, metal is removed from the support track zones, and then a recording coating is applied, which in order to simplify the process, the metal is removed from the reference track zones radiation, and before applying the recording coating, the metal layer is oxidized, the thickness of which is chosen such that the thickness of the oxide layer is L) 4n where L is the thickness of the oxide layer; with S radiation wavelength during recording — reproduction in (L formation; n the refractive index of the oxide layer for radiation wavelength during recording — reproduction of information. 0 o 4 SP

Description

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9ug.1 1 The invention relates to the field of recording and storing information, and specifically to methods for manufacturing disk media for optical storage devices and laser sound and video players. The purpose of the invention is to simplify the process. FIG. 1 shows a substrate with a deposited metal layer; in fig. 2 - the same, with the removed metal from the zones of the support tracks; in fig. 3 - metal layer after oxidation; in fig. 4 - the same, after the application of the registration coating, the Carrier (Fig. 1) contains a substrate 1, a metal layer 2 in which the metal is removed from the zones of the support tracks 3, after oxidation of the metal an oxide layer 4 is formed, as well as a recording coating 5. The carrier is made as follows in a way. A transparent metal layer 2, for example Nd, Pr, Gd or Y, is then deposited on a transparent substrate 1, then the focused electromagnetic radiation, such as laser radiation, removes the metal from the reference track 3 zones in the order of 1 µm, which results in the formation of a relief metallized pattern in the form of concentric or spiral tracks, which are then used as reference tracks to ensure the operation of the information track tracking system in the optical storage device or in the video player. When a substrate with a relief metallized pattern is heated to 350–500 ° C in an oxidizing atmosphere (in air or in an environment with an elevated oxygen content), oxidation of the layer occurs: the formation of the oxide layer. The thickness of the metal layer 2 is chosen such that the thickness of the oxide layer 4 is 4n and the thickness of the oxide layer; | - radiation wavelength during recording - reproduction of information; G1 is the refractive index of the oxide layer for the Bojuibi radiation length during recording - reproduction of information. When this condition is met, the rays reflected from one of the steps of the reference path are extinguished. Since the refractive index of the oxide films of these metals lies in the range of 1.6-1.9, the thickness of the oxide layer should be (when used for recording — reproducing radiation of the visible range) 80-90 nm, and the initial thickness of the metal layer is somewhat less than 45 -70 nm. At such thicknesses of the metal layer, a sufficiently high absorption (7–90%) of the recording radiation is ensured, and reference tracks of a width of the order of 1 µm can be obtained. Then a recording coating 5 is applied to the metal oxide layer 4 with concentric or spiral support tracks. The high thermodynamic stability of the oxide films of these metals provides the possibility of using recording coatings with local photometric destruction. PRI me R. A film of yttrium with a thickness of 60 nm is deposited onto a glass disk substrate by electron beam evaporation. A focused argon laser beam engraves concentric support tracks (removal of metal from the areas of the support tracks). The radiation power in a focused spot is 30 mW. Conducting a subsequent thermal annealing at 450 ° C in an environment with an inferred oxygen content (up to 50%) for 6 hours makes it possible to obtain a phase relief structure on the surface of a glass substrate. The obtained phase relief structure is deposited using the method of thermionic sputtering with a recording coating of the composition AsTeSe j., Which is recorded using local photothermal destruction. Information units are recorded in the area covered with metal oxide, and the parts located between the information tracks 5 are used to operate the information tracks tracking system.

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Claims (1)

METHOD FOR PRODUCING AN OPTICAL INFORMATION CARRIER, in which a metal layer is applied to a substrate, the metal is removed from the zones of the reference tracks, and then a recording coating is applied, which differs in that, in order to simplify the process, the metal from the zones of the reference tracks is removed by focused electromagnetic radiation, and before applying the recording coating, the metal layer is oxidized, the thickness of which is selected such that the thickness of the oxide layer is where H is the thickness of the oxide layer; D is the radiation wavelength for g recording - reproduction of information; η is the refractive index of the oxide layer for the radiation wavelength when recording - playing information. SU, „1190405 \ 7 ///////////// 7 fig. 1>