SU1310767A1 - Method of recording information - Google Patents

Abstract

The invention is used in detection methods based on phase transitions stimulated by the photochemical action of light in metastable systems. The purpose of the invention is the implementation of the possibility of erasing and re-recording information, as well as simplifying the method. Prepare a solution of 1,3-difenyl-2,3-propane-l-one in alcohol at a concentration of 1.8 mol / l. A thin layer of the solution obtained is placed between quartz plates with a gap of 5–30 μm and an image of a mercury lamp is projected onto it. Using a filter, radiation with a wavelength of L 365 nm is extracted and a visible image is obtained on the layer. Information is read in nonactinic light. After erasing the image, the system relaxes to its original state and the recording layer is used to record new information. 1 tab. i (lh cft

Description

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The invention relates to information recording methods based on phase transitions stimulated by the photochemical action of light in metastable systems, and can be used in multiple write-read-erase information devices.

The purpose of the invention is to simplify the method and implement the possibility of erasing and re-recording information. Obtaining a visible image under the action of UV light becomes possible as a result of photoinduced stratification with the formation of an emulsion in thin films of concentrated solutions of chalcone in alcohols or alcohol soluble polymer carriers.

The liquid recording layer is a trans-alkalone solution (1,3-diphenyl-2,3-propen-1-one), placed between two plane-parallel quartz plates separated by an airtight gasket of a given thickness (5-100 µm). Under the action of UV light, an emulsion is formed with a droplet size of a new liquid phase of 0.5–20 µm, which is 1 times the light-scattering elements forming a photographic image. The large difference in the refractive indices of the two liquid phases causes a significant amount of diffuse optical density. The non-equilibrium, but metastable state of the initial system provides amplification during the exposure. which allows to obtain the finished image in real time. After cessation of irradiation, the image is erased, the system relaxes to the initial state, and the recording layer can be used to record new information. The process of photo-stratification, which is the basis of the proposed method for recording information, consists of simultaneously proceeding photochemical transformations and diffusion processes. Accumulation during irradiation of the solution; The cis isomer of chalcone and products of its photodimerization, as well as the occurrence of significant concentration gradients of the initial trans-chalcone, cause the formation of heterogeneous regions. The appearance of an emulsion is characterized by an induction period,

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This can be reduced by general exposure of the photosensitive layer to the main exposure.

The energy sensitivity 5 of the proposed photographic system (S) is the reciprocal of the minimum amount of energy required to obtain a diffuse optical density, which provides

About image visualization. It is defined as follows. An image in UV light from a DRSh-100 mercury lamp is projected onto the recording layer. Radiation with a length of

 waves L 365 by means of the filter UFS-6. For t with on the layer receive a visible image. Then a photo will be placed, calibrated by the IMO-2 power meter, in a plane,

 where the recording layer was located, and the power density of the incident radiation I, W / cm is measured.

1 2 S j) cm / j.

. The weakening of the incident flow is carried out with the help of neutral gray filters of Sh1I sets with a known degree of attenuation.

Information is read out in nonactinic light using a UV-absorbing light filter. At the stages of visualization, an image consisting of the light scattering of microchips can be enhanced by using a dark floor method.

The introduction of an alcohol-soluble polymer into a photosensitive composition makes it possible to obtain a more time-stable image, the relaxation process in this case proceeds much faster when heated to 40-50 ° C. Later, information can also be rewritten. In addition, the additional polymer content prevents the image from being smeared out by diffusion and increases the local variance in the photochemical product during the recording of information.

Example 1. A solution of chalcone in ethyl alcohol is prepared at a concentration of 3-10 mol / l. A thin layer of the prepared solution is placed between 55 two quartz plane-parallel plate plates 6x9 cm in size, separated by a gap of 30 mm. On one of the thus obtained liquid recording layers project

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negative or positive image in UV light from a DRSh-100 mercury lamp. The emission of radiation with a wavelength of 365 nm is CONDUCTED using a UFS-6 filter. The power density of the radiation from the incident to the photosensitive layer is 1 W / cm. Information is recorded for 5 seconds. Energy sensitivity is 2 10 cm / j. After the cessation of irradiation, the image is completely erased in 20 seconds.

A control sample not exposed to actinic radiation remains unchanged. F5

Visualization is possible due to the light diffusion of microdroplets that are detected microscopically at irradiation sites and are elements that form an image.

PRI mme R 2. Prepared according to example 1, the chalcone solution is placed between the quartz plates with a gap of 5 μm. The obtained sample is exposed in the UV spectral region (365 nm) 25 with a light beam of 10 W / cm for 4 s and a light-scattering image is obtained. Full erasure of the image takes 25 seconds.

The photosensitivity in this example 30 is 2.5 cm / j. Changes in the control sample is not detected.

Example 3: Preparing a Solution

plane-parallel plates separated by a gap of 30 μm. The image from the DREWA mercury lamp is projected onto the liquid recording layer; The radiation power density is 10 W / cm. After exposure for 18 seconds, an image is formed. . The image is erased in 3 minutes.

The control sample does not change its characteristics ..

Comparison of the main characteristics of the proposed method of recording information and the prototype is given in the table.

When using the proposed method, the appearance of an image in the beam of actinic radiation provides the ability to record information in seconds, while with the prototype method, this requires several times more time. Writing information in reverse mode with a write-read-erase duty cycle of a few minutes is also an advantage of the proposed method compared to the prototype. A large choice of concentrations of the photosensitive component provides flexibility in the preparation of the recording layer, which allows recording information in a wide range of radiation powers. Besides.

chalcone at a concentration of 1 mol / l and po-35 information is recorded at

place it between plane-parallel plates. The thickness of the layer is 30 microns. The image is formed in 7 s at a beam of 10 W / cm. Light sensitivity

equal to 14 cm / j. Control sample: 40, special equipment is required.

does not undergo any changes.

PRI me R 4. The sample, after erasing the image obtained in Example 3, was used to re-fly the light of the recording layer.

write information in the same way as in example 3.

Photosensitivity after performing one rewrite cycle has not changed .JQ

Example 5. A solution of chalcone in alcohol at a concentration of 1 mol / l is placed between the plates with a gap of 5 μm. Exposure leads to the formation of an image in a beam of light jj 10 W / cm for 2 s. .

PRI me R 6. A solution of chalcone in diethylene glycol at a concentration of 5 x X 10 mol / l is concluded between two

based on an organic compound capable of photoinduced phase transition, characterized in that, in order to simplify the method and realize the possibility of wounding and re-recording information, use 1,3-diphenyl-2,3-foam solution as a recording layer -l-ona in alcohol at a concentration of 3-10-1.8 mol / l, the solution is placed between quartz plates with a gap of 5-30 µm and exposed to light in the region of 365 nm to complete visualization of the image.

plane-parallel plates separated by a gap of 30 μm. The image from the DREWA mercury lamp is projected onto the liquid recording layer; The radiation power density is 10 W / cm. After exposure for 18 seconds, an image is formed. . The image is erased in 3 minutes.

The control sample does not change its characteristics ..

Comparison of the main characteristics of the proposed method of recording information and the prototype is given in the table.

When using the proposed method, the appearance of an image in the beam of actinic radiation provides the ability to record information in seconds, while with the prototype method, this requires several times more time. Writing information in reverse mode with a write-read-erase duty cycle of a few minutes is also an advantage of the proposed method compared to the prototype. A large choice of concentrations of the photosensitive component provides flexibility in the preparation of the recording layer, which allows recording information in a wide range of radiation powers. Besides.

room temperature (according to the prototype, the working temperature is above), the manufacturing techniques of the photosensitive element. simply and not:

Claims (1)

Invention Formula A method of recording information, including exposing an ultraviolet to an organic compound capable of photo-induced phase transition, characterized in that, in order to simplify the method and realize the possibility of erasing and re-recording information, 1,3-Diphenyl-2,3 solution is used as a recording layer -product-l-one in alcohol at a concentration of 3-10 - 1.8 mol / l, the solution is placed between quartz plates with a gap of 5-30 µm and exposed to light in the region of 365 nm to complete visualization of the image. -  mol / l of chalcone in these Editors A. Ogar Compiled by V. Kondratyev Tehred L. Serdyukova Proofreader M.Sharoshi Order 1888/43 Circulation 421 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4