SU1628082A1 - Method for photo thermal data recording - Google Patents

Abstract

The invention makes it possible to increase the reliability of recording and the number of cycles of gag. The surface of the recording coating is charged before recording, the energy effect of the electromagnetic beam on the recording coating during recording is performed with an energy greater than the softening energy of the recording coating, but less than the evaporation energy of the recording coating, and before recording or clearing the information the recording coating discharges. 1 hp f-ly, 4 ill.

Description

The invention relates to a technique for recording information using electro-magnetic radiation exposure and is intended for use in computing, in video recording and sound recording equipment, and in other information storage and n processing systems, as well as in microelectronics in the production of microcircuits.

The purpose of the invention is to increase the reliability and number of rewriting cycles.

Fig. 1 shows a fragment of a discrete-record recording media; in fig. 2 - the same, with analog recording; in FIG. 3 shows an example implementation of a storage medium according to the invention; figure 4 is the same, another example.

In the recording mode according to the method, the applied

on a substrate a thin film recording among, the material of which can be both a semiconductor and a dielectric. Thermionic emission, corrosion discharge, high-frequency discharge, etc. can be used to form a charge on the surface of the film. - Due to the formation of surface and volume charge of the recording coating, the surface energy of the film is reduced, which can even become negative. the density of microdefects, ie, embryo holes, increases. However, the instabilities of the recording medium will develop into a two-level depth of the moon-like relief only in the region where the laser radiation will subsequently melt it. At the same time various options can be implemented.

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mechanisms for recording information. At; - the discrete recording (Fig. 1) under the influence of the recording signals, the laser beam can be modified by the intensive tee, by the cross-sectional area, by the trajectory and otherwise. With an analog recording 4, 2) the laser beam can be modulated, for example, along its width in the direction perpendicular to the axis of the information track. In this case, in any variant of recording information, there is no need to heat the film to a temperature substantially higher than its temperature, since the process of dimpling due to a significant decrease in the surface energy proceeds much more intensively. This makes it possible to use laser radiation of reduced intensity for recording, as well as practically not produce irreversible destruction of the film of the recording medium, respectively, increasing the cyclical nature of the processes. The component of the surface energy determined by the charge of the film can be significant in this case, which allows the use of recording medium films that wet the substrate well in the molten state and have high adhesion to the substrate in the solid state. Therefore, in the information storage mode, in which the recording medium film is discharged, the carrier increases resistance to various kinds of erasing effects. Therefore, by changing the charge on the surface of a thin film of the recording medium, its sensitivity can be varied over a wide range: record and lower in storage mode. A change in the sensitivity of the recording medium in this case occurs as a result of a change in the surface energy and the density of microdefects — the hardened well,

In the mode of erasing information in order to ensure the high wettability of the substrate by the recording medium, it is completely discharged beforehand. L then have an appropriate energy impact. Thus, with the complete erasure of all recorded information, the carrier can be heated, subjected to intense light irradiation, etc. With local erase5 5 0 5 o Q

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In order to transport information, the required amount of energy to a predetermined portion of the recording coating of the carrier can be achieved using a defocused laser beam.

According fig.Z information carrier consists of a quartz cylinder 1, on the inner surface of which a film of the recording medium 2 is applied (for example, chalcogenide glass,). A transparent conductive film 3 (for example, IruO,) is deposited on the outer surface of cylinder 1. Along the axis of the cylinder, on the quartz covers of the insulator 4 in the tensioned state, is fixed the center electrode 5 (for example, tungsten wire). In the quartz lids 4 one or two topodes 6 for the central electrode-5 are fixed. In one of the quartz lids 4 there is a sealed tube of 7 days evacuating the air from cylinder 1 and filling it with an inert gas if necessary in its internal cavity. A laser beam 9 is used for the recording of the information, which is focused on the registering coating 2 by the lens 10. The sign-like potential difference required for the corona discharge is applied to terminals 11 and 12, then from them through the spring contact 13 it is applied to the conductive transparent coating 3, and through contact 14 and tokovod 6 - to the corona central electrode 5.

The second embodiment of the information carrier according to FIG. 4 differs from the first in that the quartz cylinder 1 is installed in a stationary protective collapsible cap consisting of two hollow cylinders 16 and 17. The cylinder 1 inside the capsule rotates on ball bearings 18. For supplying to the recording coating 2 The laser beam 9 in the side wall of the capsule is provided with a transparent slit 19 parallel to the axis of the cylindrical information carrier. In this implementation of the information carrier, thermionic emission can be used to charge the recording coating 2, in this case the corresponding potential difference is applied to terminals 11 and 15, and the internal cavity 8 of cylinder 1 is evacuated. When applied to terminal 18 of a high positive potential with respect to terminals 11 and 15, electrons are deposited on the surface.

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the recording coating and charge it. To ensure that the recording coating 2 can be discharged after disconnecting terminals II, 12 and 15 from the power sources, semiconductors should be used as the recording medium.

Claims (1)

Invention Formula I. A way to record the information by means of an energy effect on a recording coating capable of spreading over the substrate in a softened state, m. By a modulated electromagnetic beam, creating informational paths in the form of a two-level surface depth in a reparative coating. and burn Neither information is repeated energy impact, characterized in that, in order to increase the reliability and number of cycles of information, the surface of the recording coating is burned before recording, the energy effect of the electromagnetic beam on the recording coating during recording is performed with an energy greater than the softening energy of the recording the coating, but less evaporation energy of the recording coating, and before storage or erasure of information, the recording coating is discharged. 2, Method Chop. 1, about tln h arani and the fact that an opaque dielectric is used as a recording material for the coating. FIG. I Ggy UD-U U w v% w u h v ul & ft ft & ft 4 $ // 9 I, f rrrrfJSfff rr f, -, ff. f f P4 fl  -.// L A Ґ $ GJ   y – y h uLT4 x v M t F Јl fer F Y 2 gpf g oo91 ten 1 28 eight 19 17 18 4 ./ X .- / /  (f {{i FIG A