SU1205184A1 - Information medium for thermomagnetic recording and method of recording information - Google Patents

Abstract

1. A recording medium for thermomagnetic recording containing a substrate with thermomagnetic, photoconductive and conductive layers sequentially arranged on it, characterized in that, in order to improve the recording quality and expand the dynamic range, a transparent one is inserted between the photoconductive and conductive layers. dielectric layer. 2. A method of recording information in which the photoconductive layer is exposed to electromagnetic radiation and at the same time makes an electrical impact on this layer, characterized in that, in order to improve the recording quality and expand the dynamic range, the electrical impact is carried out by a high-frequency electric field. sl t ND About sl 00 4 ::

Description

The invention relates to the thermomagnetic recording of information and can be used in the storage of P1N1; their devices for registering digital and analog information, as well as for recording images on a reverse medium.

The aim of the invention is to improve the recording quality and the wider dynamic range.

To achieve this goal, a transparent dielectric layer is inserted into the recording medium for thermomagnetic recording, which contains a burner with thermomagnetic, photoconductive and conductive layers sequentially arranged on it, between the conductive and conductive layers.

According to the information recording method, in which the photoconductive layer is exposed to electromagnetic radiation and at the same time makes an electrical impact on this layer, the electric impact is carried out by a high-frequency electric field.

Fig. 1 shows a storage medium and a device for implementing a method for recording information; figure 2 - diagrams of the device.

The information carrier contains a substrate 1, a thermomagnetic 2, a photoconductive 3, a transparent dielectric 4 and a conductive 5 layers.

A device for implementing the method of recording information comprises a radiation source 6, a lens 7, a high-frequency generator 8, and a carrier 9 of information.

The substrate 1 (Fig. 1) of the information carrier 9 is coated with a thermomagnetic layer 2 made of an amorphous Tb-Fe alloy, onto which a photo-conductive layer 3 is successively applied, which can be made of cadmium sulfide, about 100 nm thick, and a transparent dielectric layer 4, for example , from monoxide or silicon dioxide, micron thick, and then - look for a layer 5 of transparent

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members of gold or tin oxide.

A device that implements the method of recording, works as follows.

5 Modulated by the information signal, the radiation of the radiation source 6 by the lens 7 is focused on the photoconductive layer 3. When radiation is applied to this layer

10 (Fig. 2a), the conductivity of the photoconductive layer increases along curve S (Fig. 2). The time constant of this process depends on the material properties of the photoconductive layer and partially

15 from the light level. When the conductivity rises to its steady-state value, the photoconductive layer is affected by the high-frequency electric field of the high-frequency

20 of the generator 8 (Fig. 26), applied between the thermomagnetic layer 2 and the transparent conductive layer 5 (Fig. 1). The elementary platform of the carrier can be represented as a capacitor C, which is sequentially switched on, with a specific surface capacitance C, defined by the dielectric constant of the transparent dielectric layer 4 and its thickness, and a resistor with

30, the specific surface conductivity d is proportional to the illumination I and depends on the characteristics of the photoconductive layer 3. Obviously, the density of energy release in this case is p V (and C, where W is the circular frequency of the high-frequency pulse in (FIG. 2) generator 8 (FIG. 1). Pri s d, p d, and at 00 d

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the M frequency is possible both direct and inverse slope of the gradation characteristic, which provides the ability to control the gradation, f characteristic, in particular, the possibility of obtaining both positive and negative images of high quality when registering.

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The M frequency is also possible to have a forward and reverse slope of the gradation characteristic, which makes it possible to control the gradation characteristic, in particular, the possibility of obtaining both positive and negative images of high quality during registration while increasing the sensitivity of the information carrier.

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Claims (2)

1. A storage medium for thermomagnetic recording, comprising a substrate with thermomagnetic, photoconductive and conductive layers sequentially arranged on it, characterized in that, in order to improve the recording quality and expand the dynamic range, a transparent dielectric layer is introduced between the photoconductive and conductive layers. 2. The information recording method in which a photoconductive layer is exposed to electromagnetic radiation and simultaneously carry electrical impact on the layer, characterized in that _for the purpose of improving the quality of recording and © dynamic range, exposure is carried out electric high-frequency electric field.