Media optical storage device and method for recording optical information on it

 

(57) Abstract:

The group of inventions relates to techniques for recording and reproducing information of the optical radiation. The media contains a substrate of svetopropusknaya material, the recording medium including a reflective layer of metal or metal alloy with a thickness of 5-30 nm and chemically active with respect thereto layer. The reflective layer of the recording medium is made on the basis of compounds of elements of main group to the sixth group of the Periodic table of elements with main group elements of the fourth - fifth groups. The media may have a layered structure. Impinging a pulsed laser beam on the reflective layer of the recording medium, causing the effect vodorastvorimie in chemically active with respect thereto layer, causing the formation of transparent or opaque Pete. The technical result is increased reliability of information storage, capacity, and optical contrast when the extension class of the materials used and the cost reduction. 2 S. and 6 C.p. f-crystals, 4 Il.

The invention relates to the technique of recording and reproducing information of the optical radiation and are intended for use in optical zapomina range.

This group of inventions forming a single General inventive concept, since the inventive media, optical storage devices intended for use in the present method of recording optical information.

Known carriers of optical information containing a substrate of svetopropusknaya material entering the environment from alloys of tellurium, arsenic, and selenium [1] or arsenic, selenium, tellurium and germanium [2], deposited on a substrate. In [1] a reflective layer made of metal with high reflectance aluminum, inert to interaction with the recording medium deposited on the recording medium, and above it is a protective layer of vodootvedenija polymer.

The irradiation of such media with a laser beam to the optical recording of information was due to the ablation of the recording medium with the formation of the recesses in the places of contact of the laser pulses, which led to the creation of optical contrast in these places, called leagues, with respect to areas outside the hit pulses [1]; or evaporation of the material of the recording medium, which also led to the creation of optical contrast between the recorded and unrecorded aerogo radiation it is necessary to have up to record high reflectivity (>60%) in a wide range of the optical spectrum. And the carriers of this type provide high reflectivity in a narrow region of the spectrum, due to the spectra of reflection and transmission of the material of the recording medium. It is difficult to provide high reflectivity of the recording medium, which should at the same time to be highly sensitive to changes its state upon irradiation with a laser beam, and therefore, to have a high absorption coefficient to maintain a record of.

In addition, a relatively low softening temperature of the recording medium of the above materials reduces the climatic stability of the optical information carrier, i.e. reduced reliability of information storage in the temperature range 60-90oC.

Known carriers of optical information containing a substrate of svetopropusknaya material of the recording medium, deposited on a substrate and made of organic materials, which are commonly used liquid dyes, which provide high sensitivity with a low absorption coefficient. The layer of the recording medium sequentially deposited reflective layer, usually made of gold, silver, aluminum, copper or their alloys, and Samit cost due to the use of expensive metal reflective layer and the high cost of organic dyes.

In addition, organic dyes also have a narrow operating region of the optical spectrum.

A well-known carrier optical information selected for the prototype, containing a substrate of svetopropusknaya material entering the environment, consisting of two sequentially deposited layers: a reflective layer located on a substrate made of bismuth, indium, tellurium, tin, antimony, lead, titanium, zinc, chromium, germanium, copper, cadmium, gold, aluminum or silver, i.e. metal with a low melting temperature, and chemically active layer of a glassy alloy of arsenic-sulfur, arsenic-selenium, germanium-sulfur, germanium-selenium, arsenic-germanium-selenium, arsenic-germanium-sulfur or arsenic-germanium-sulfur-selenium, and over chemically active layer of the recording medium sequentially, there are additional reflective layer of gold or aluminum and a protective layer of vodootvedenija polymer [4].

This optical information carrier has a high reflectance in a wide region of the optical spectrum due to the presence in the recording environment, additional reflective layer with high reflectivity in a wide spectral range, which is impressive reflective layer recording medium and its chemically active layer, the reflection coefficient of the medium is determined by the reflection coefficient of the additional reflective layer, the material must be chemically inert relative to the chemically active material layer of the recording medium. The protective layer should have a mechanical hardness and play a protective role, preventing the influence of the external environment.

However, if the storage media is difficult to maintain high reflectivity additional reflective layer.

Since the formation of the pit when recording occurs under the action of laser radiation due to the interaction of both layers of the recording medium, it is difficult to control the size of the formed pit.

And in this media provides education only Pete, transparent at the wavelength of laser radiation, which changes the optical path length of the laser radiation on the optical depth of the formed pita and leads to shift the optical phase of the laser radiation. As a result, the receiver laser is doing the reading reflected light with the changed phase. To obtain a high level of the signal received at the receiver laser when reading, forming biretta with high reflectance.

But in the General case, to maintain a record of important is the presence of optical contrast between areas of the pit and out of them, which may be achieved by changing the phase and amplitude of the laser radiation. And formed pittas can be both transparent and opaque (i.e., high absorption coefficient at the wavelength of laser radiation).

The objective of the invention is to provide a carrier having a high reliability in storing information and allowing at the same time to use a wider class of materials capable of when recording optical contrast in the recording medium between educated leagues and outside, i.e., the goal is to create more technological media of optical information with a lower cost, and with high capacity recordable information.

The solution to this problem is provided in the optical media storage device containing a substrate of svetopropusknaya material, the recording medium including a reflective layer of metal located on the substrate, and chemically active with respect thereto layer deposited on the reflective layer, zaditen of metal or metal alloy with a thickness equal 5-30 nm, chemically active when recording with respect to the chemically active material layer of the recording medium, is made from an alloy based on compounds of elements of main group to the sixth group of the Periodic table of elements with main group elements of the fourth-fifth groups, with the ability to create media additional level entry, which includes the same substrate, the recording medium and the protective layer.

Moreover, the protective layer can be deposited on a chemically active layer of the recording medium.

This medium may contain at least one additional recording level.

The media may contain a combination of two interconnected single or multi-level structures located to each other so that the reflective layer of the recording medium at any level of each design is the first of two layers of the recording medium relative to the incident laser beam during the recording.

In addition, in any medium with a single-level, multi-level design or containing a combination of single or multi - structures - chemically active layer of the recording medium can the relation to the chemically active material layer of the recording medium. And a protective layer may be applied to this additional layer.

Moreover, the combination of additional layers of the substrate, the recording medium and the protective layer, forming an additional level of account, to be applied on the existing protective layer of the device.

In the General case, the carrier can contain multiple levels, each of which has a combination of layers of the substrate, the recording medium and the protective layer, forming a layered structure of the media.

It is possible in each of the additional layers swapping substrate and a protective layer of transparent vodootvedenija polymer, i.e., any of the additional layers may consist of the following combination of layers: a protective layer of transparent vodootvedenija polymer, the reflective layer of the recording medium, chemically active with respect thereto layer of the recording medium and the substrate.

The record and reproduction of optical information in both of the above cases, there are multiple levels in the media from the side of the substrate of the first level.

At the same time, the capacity of the recordable optical information can be increased by providing in

In this case, the carrier must contain a combination of two interconnected single or multi-level structures, interconnected in such a way that the layers of the recording medium are arranged one against the other so that the reflective layer of the recording medium at any level of each of the designs was the first relative to the incident laser beam during the recording.

Explain the impact of these distinctive signs on the solution of the problem.

Execution of the reflective layer of the recording medium not only metals, but also of metal alloys, chemically active when recording with respect to the chemically active material layer of the recording medium, can provide higher sensitivity for recording metal alloys compared to pure metals because of the lower melting point metal alloys in comparison with metals. This extends the class of the used metals used in alloys, due to such high-melting metals as iron, Nickel, zirconium and others.

To create the amplitude of the optical contrast (and not only the phase, as in the prototype) between the recorded areas (patami) media wooltana materials not only to the low absorption coefficient of laser radiation, but materials that absorb laser radiation with the formation when writing is not only clear Pete (as in the prototype), but opaque Pete. This allows the use of alloys of elements of the main subgroups of the sixth group of the Periodic table with metals such as antimony, bismuth, and other main group elements of the fourth-fifth groups, i.e., to extend the class of materials that can be used as a chemically active layer of the recording medium.

When you create the optical contrast between the recorded (patami) and unwritten areas do not need to apply a high level signal in a pita, which gives the possibility of applying a protective layer directly on the reactive layer of the recording medium without using an additional layer of metal or alloy of metals in the reactive layer of the recording medium, and this contributes to the solution of problems of storage media.

To increase the capacity of the information recorded in this medium can be used at least one additional combination of layers of the substrate, the recording medium and the protective layer, including installed upside down polozheniya combinations. However, the record information (education Pete) can be carried out in each of the received levels.

The ability to create layered media due to the fact that the layer of metal or metal alloy that is used as the reflective layer of the recording medium, the thickness of 5-30 nm, is semi-transparent at the wavelength of laser radiation that provided separation of individual layers of a thickness of the protective layer provides the ability to read and write information on the second and further levels.

The thickness d of the separation of the protective layer between the lower and upper levels should be selected to limit the process vodorastvorimie within the recording medium corresponding layer; heat insulation of this level from below and above levels for the localization of the energy required for the formation of a pita at the appropriate level; to create conditions for distinguishing levels of device reading and writing data, but the value of d should be not less than the value chosen from the condition:

d = /2A2,

where is the wavelength of the laser radiation;

A - aperture lens device read/write.

Moreover, the number of levels is defined in the top level and can be determined by engineering calculation.

The ability to install any of the levels in an inverted position due to the desire to simplify the technological process of manufacturing of the media and does not change the process of recording in the recording method is invariant to the order of the specified combination of individual level).

At the same time, the proposed carrier may use an additional layer applied to a chemically active layer of the recording medium.

However, due to the fact that there is no need for a high level signal in a pita, you can perform this layer of material with low reflectivity, such as titanium, zinc, ceramics based on complex silicates, titanium carbide and other materials with high mechanical hardness and chemically inert.

And the protective layer can be applied in this case, this additional layer, or may be absent, because the function of the protective layer will assume this additional layer.

Then the process of education Pete is happening in terms of space, limited additional layer with high mechanical hardness.

Structuresthe substrate 1 from svetopropusknaya material, recording medium including a reflective layer 2 of metal or alloy of metals, of a thickness (5-30) nm, located on the substrate, and chemically active with respect thereto layer 3 deposited on the reflective layer 2, a protective layer 4 of the curable polymer located on the chemically active layer 3 of the recording medium.

This chemically active layer 3 may be made of an alloy based on compounds of elements of main group to the sixth group of the Periodic table of elements with main group elements of the fourth - fifth groups.

In Fig. 2 shows a variant of the structure of the proposed carrier, in which the chemically active layer 3 of the recording medium caused an extra layer 5 made of materials having mechanical hardness and chemically inert relative to the chemically active material layer 3 of the recording medium.

In this case, the protective layer 4 deposited on the additional layer 5.

In Fig. 3 shows a variant of the multilevel structure of the proposed media on the example of a two-tier structure.

Consider the example of the manufacture of the media.

Example 1. On a polycarbonate substrate with a thickness of 1.2 mm, dilatrane in vacuum consistently applied an alloy of indium and tin in the ratio of 9:1 with a thickness of 25 nm and As2S3thickness of 14 nm. A protective layer of a thickness of 5-15 μm of vodootvedenija polymer to the sulphide of arsenic by centrifuging on the air, followed by hardening under the action of ultraviolet radiation.

The recording of information was performed on a standard recording device Traxdata CDRW 4260 on 2nd speed. Reading the recorded information produced on the testing device Qlover QA-101 D (wavelength of the read laser 780 nm). The reflectance of the information carrier is 70%, I3/Itop- 0,39, I11/Itopof 0.77. Media working temperature from -10 to 60oC.

Example 2. On a substrate as in example 1 by the method of thermal evaporation in vacuum consistently applied bismuth thickness of 25 nm and SbSe a thickness of 130 nm. A protective layer of a thickness of 5-15 μm of vodootvedenija polymer to the antimony selenide by centrifuging on the air, followed by hardening under the action of ultraviolet radiation.

Recording and playback of information is carried out as in example 1. The reflection coefficient of the media is 57%, I3/Itop- 0,43, I11/Itop- 0,80. Media working temperature from-adavale put antimony thickness of 21 nm and Ge2Se3the thickness of 25 nm. A protective layer of a thickness of 5-15 μm of vodootvedenija polymer to selenide Germany by centrifuging on the air, followed by hardening under the action of ultraviolet radiation.

Recording and playback of information is carried out as in example 1. The reflection coefficient of the media is 65%, I3/Itop- 0,37, I11/Itop- 0,73. Media working temperature from -10 to 60oC.

Example 4. On a substrate as in example 1 by the method of thermal evaporation in vacuum consistently put the tin of a thickness of 24 nm and As25Se68Sn7thickness of 38 nm. A protective layer of a thickness of 5-15 μm of vodootvedenija polymer to the layer of arsenic-selenium-tin by centrifuging on the air, followed by hardening under the action of ultraviolet radiation.

Recording and playback of information is carried out as in example 1. The reflection coefficient of the media is 58%, I3/Itop- 0,35, I11/Itopis 0.71. Media working temperature from -10 to 60oC.

Example 5. On a substrate as in example 1 by the method of thermal evaporation in vacuum sequence is 00 nm. A protective layer of a thickness of 5-15 μm of vodootvedenija polymer to the layer of titanium by centrifuging on the air, followed by hardening under the action of ultraviolet radiation.

Recording and playback of information is carried out as in example 1. The reflection coefficient of the media is 68%, I3/Itop- 0,42, I11/Itop- 0,82. Media working temperature from - 10 to 60oC.

Example 6. On a polycarbonate substrate with a thickness of 0.1 mm with pre-spiral markings for tracking when recording [1] by the method of thermal evaporation in vacuum consistently applied indium thickness of 22 nm, GeSe2a thickness of 12 nm. Further selenide Germany put a protective layer of vodootvedenija polymer by centrifuging the thickness of 2-15 μm, followed by curing under the action of ultraviolet radiation. Another polycarbonate substrate 0.6 mm thick, 120 mm, with pre-spiral markings for tracking when recording [1] by the method of thermal evaporation in vacuum consistently applied indium thickness of 10 nm, GeSe3thickness of 10 nm. The protective layer 4 of a thickness of 1-10 microns of clear phototherapeutical from polycarbonate and produce the curing under the action of ultraviolet radiation. A diagram of such a carrier is shown in Fig. 3.

Recording and reading of information is carried out from the substrate 1 by laser radiation with a wavelength of 650 nm. The reflection coefficient of the media on the first recording medium to record is 38%, after recording 12%, the reflectivity of the second recording medium to record is 68%, after recording 24%. Media working temperature from -10 to 60oC.

Example 7. Take two medium, made as described in example 6. Next, the protective layer of one of these media by centrifuging put a layer thickness of 2-15 μm of transparent vodootvedenija polymer, combined with a protective layer of the second carrier and produce the curing under the action of ultraviolet radiation.

Recording and reading of information received media carried out from the side of the one substrate and/or the other from the United media laser radiation with a wavelength of 650 nm. While the level of the signal writing and reading in each of the layers United media remained the same as in example 6.

As the material of the substrate media can be used glass, polycarbonate, polymethylmeth magnetron sputtering and thermal evaporation. The deposition rate of 0.5-50 nm/s, the pressure of residual gases in the chamber 10-3-10-6mm RT.article.

Known methods of recording optical information on the optical media storage device [2, 1], which is used as the medium made by the method of thermal evaporation or magnetron in a vacuum on a substrate of svetopropusknaya alloy material of the recording medium 2 or the heat, or the magnetron evaporation in vacuum on a substrate of svetopropusknaya alloy material of the recording medium and the reflective layer made of metal with high reflectivity, and then applying by centrifuging the reflective layer of the protective layer of vodootvedenija polymer 1.

When writing such a medium is irradiated with a laser beam, which is under the influence of the recording medium or evaporates, which leads to the reduction of the reflection coefficient in places account, i.e. in the places of formation of pit 2, or is the effect of ablation, which also leads to a decrease of the reflection coefficient in the places of formation of pit 1.

In the method [1] to provide a record high reflectivity is determined by the reflection coefficient of the metal traincrew reflective layer. After recording in the method (1), as well as to recording, the reflectance of the reflective layer (metal), and in the method [2] is the reflection coefficient of the substrate due to the evaporation of the recording environment.

It was difficult to provide a compromise between the high reflectance before recording and high sensitivity recording medium (high absorption coefficient) when recording. As a result, when used in the recording process these materials with high sensitivity was not possible to obtain a high reflection coefficient and, ultimately, to provide sufficient optical contrast between the recorded areas (patami), which fell pulses of laser radiation, and unrecorded regions of the recording medium.

A known method of recording optical information on the optical media storage device [3], which use the medium, made by centrifuging with drawing on a substrate of svetopropusknaya material organic dye and a reflective layer, which may be gold, silver, copper or aluminum or their alloys.

The recording process is irradiated with a laser beam layer Regina and swells in places of exposure to pulses of laser radiation, strengthening formed in the recording medium pita, creating a change in the length of the optical path. This reflective layer does not react with the organic dye in the recording. In places of education Pete reflectance decreases and becomes a contrast to the places of the recording medium outside of the pit.

The recording of such media can be carried out only in a narrow spectral region, because organic dyes have narrow operating region of the spectrum. In addition, this process is expensive because it requires the use of expensive materials, media, production of which is monopolized and requires expensive equipment.

In the method for recording optical information, the optical storage device [4] was chosen for the prototype, when recording is used, the media made consistent by applying to a substrate of svetopropusknaya material by the method of thermal evaporation or magnetron in a vacuum material of the reflective layer of the recording medium, a chemically active layer of the recording medium and additional reflective layer, and then applying by centrifuging protective is rnym pulsed radiation, passed through the substrate from svetopropusknaya material, the reflective layer of the recording medium carrier, causing the formation of it in the places of impact impulses areas, called leagues with optical contrast with respect to its areas not exposed to pulses and transparent at the wavelength of laser irradiation.

Thus, in this way when writing under the influence of laser irradiation is the creation phase of the relief as a result of interaction of the materials of the reflective layer and the reactive layer of the recording medium that was possible with the education pit, transparent at the wavelength of laser irradiation.

However, currently there is a wide range of devices for recording and reproducing optical information in which the receiving optical contrast, the underlying optical information recording can be achieved not only through the creation phase of relief, but also through the creation of contrast in the amplitude of the laser radiation in places formed pit and outside of them.

This, in turn, suggests the possibility of a significant expansion of the range of materials that can be used in processany laser radiation Pete.

This makes it unnecessary to use additional reflective layer of material with high reflectance and you can use as an additional layer of material with low reflectivity, or the ability to use media without this layer.

The objective of the invention is the improvement generated when recording the optical contrast between the recorded areas (leagues) and unrecorded regions of the recording medium while expanding the range of materials that can provide the recording process and thereby reduce the cost of this process.

The solution to this problem is provided in the method of recording optical information on the optical media storage device, in which the pulsed laser signal passing through the substrate from svetopropusknaya material on the reflective layer of the recording medium carrier, made of metal, is chemically active with respect to the chemically active material layer of the recording medium, causing the formation of it in the places of impact impulses areas, called patami with optical contrast against the notable the impact of the pulsed laser beam is performed on the reflective layer of the recording medium, is made of metal or alloy of metals, and cause the effect of his vodorastvorimie in chemically active with respect thereto layer of the recording medium, forming a pita, which is transparent or opaque at the wavelength of laser radiation.

When you create the effect of vodorastvorimie metal or alloy of metals in chemically active with respect thereto layer of the recording medium as the latter is chosen based alloy compounds of elements of the sixth group of the Periodic table of elements with main group elements of the fourth - fifth groups.

Explain the impact of the distinctive features of the proposed method accounts for solving the problem.

To create the proposed method of recording optical information of the amplitude of the optical contrast (not just phase contrast, as in the prototype) changes the mechanism of formation of pita due to the effect of vodorastvorimie material of the reflective layer is chemically active with respect thereto layer of the recording medium.

Thus the activation energy of the process vodorastvorimie less than p is the receipt of an optically homogeneous alloy in the prototype, the formation of only transparent at the wavelength of laser radiation Pete.

In the proposed method of recording the formation of an environment that does not have a high reflection coefficient due to the effect of vodorastvorimie material of the reflective layer is chemically active with respect thereto layer of the recording medium, and this is the main factor causing changes in the amplitude of the optical radiation.

The proposed mechanism accounts allowed to extend the class of materials of the reflective layer and the chemically active with respect thereto layer recording medium, including through the use of cheaper materials.

Consider the examples of implementation of the optical information recording method proposed by the media, examples of the manufacture of which have been discussed above.

Example 1. Consider the process of recording information on the medium produced according to example 1, from the description of examples of the manufacture of information carriers. The irradiation of this medium pulse laser radiation with a wavelength of 780 nm and a power of 6 mW is observed process vodorastvorimie alloy of indium-tin in the sulphide of arsenic, which are formed pita transparent at the wavelength of laser radiation in the recording medium in locations pop the information to the media, manufactured according to example 2, from the description of examples of the manufacture of information carriers. The irradiation of this medium pulse laser radiation with a wavelength of 780 nm and a power of 7 mW observed vodorastvorimie bismuth to antimony selenide, which are formed pita opaque at the wavelength of laser radiation in the recording medium in locations ingress of pulses, with the transmission of 4%, a reflection of 25%.

In this media can be used an additional layer, for example of zinc, which is applied to the chemically active layer of the recording medium, the bismuth selenide. Reflection in a pita after recording in this case is equal to 26%, i.e. almost the same as the reflection in a pita media without additional layer of zinc. This is an indication that the proposed method of recording in the formation of opaque Pete presence of an additional layer on the chemically active layer of the recording medium does not lead to a significant change in the amplitude of the optical signal.

The process of recording optical information illustrated in Fig. 4, which shows the formation of Pete when writing to the media, which shows that the level of the laser signal emitted by the safety layer.

The laser beam 6 passes through a separating prism 7 and the transparent substrate 1, is reflected from the reflective layer 2 of the recording medium, passes in the opposite direction and enters the device registration radiation 8. Because when recording information using a laser with a large capacity, this leads to heating of the reflective layer 2 of the recording medium and causes a chemical reaction between substances reflective layer 2 of the recording medium and chemically active with respect thereto layer 3 of the recording medium and the recording in places of influence of laser pulses are formed of a transparent or opaque at the wavelength of laser radiation pittas 9.

Sources of information taken into account

1. RF patent N 2127915, M CL G 11 B 7/24, publ.18.06.98,

2. French patent N 2363857, M CL G 11 7/00, publ. 1978

3. Patent EPO N 0353394, M CL G 11 7/00, G 11 7/24, publ. 17.04.89,

4. RF patent N 2151432, M. class. G 11 7/00, G 11 B 7/24, publ. 20.06.2000,

1. Media optical storage device containing a substrate of svetopropusknaya material, the recording medium including a reflective layer of metal located on the substrate, and chemically active is trichosis fact, that the reflective layer of the recording medium is made of metal or metal alloy with a thickness of 5 to 30 nm, chemically active when recording with respect to the chemically active material layer of the recording medium, is made from an alloy based on compounds of elements of main group to the sixth group of the Periodic table of elements with main group elements of the fourth - fifth groups, with the ability to create media additional level entry, which includes the same substrate, the recording medium and the protective layer.

2. Media under item 1, characterized in that the protective layer is deposited on a chemically active layer of the recording medium.

3. The carrier according to any one of paragraphs.1 and 2, characterized in that it contains at least one additional layer of the media.

4. The carrier according to any one of paragraphs.1 to 3, characterized in that it contains a combination of two interconnected single or multi-level structures, located in relation to each other so that the reflective layer of the recording medium at any level of each design is the first of two layers of the recording medium relative to the incident laser beam during the recording.

the additional layer of material, having a mechanical hardness and chemically inert relative to the chemically active material layer of the recording medium.

6. Media under item 5, characterized in that the protective layer deposited on said additional layer.

7. The method of recording optical information on the optical media storage device, in which the pulsed laser signal passing through the substrate from svetopropusknaya material on the reflective layer of the recording medium carrier, made of metal, is chemically active with respect to the chemically active material layer of the recording medium, causing the formation of it in the places of impact impulses areas, called patami with optical contrast with respect to its areas not exposed to pulses and transparent at the wavelength of laser radiation, characterized in that the pulsed laser beam is performed on the reflective layer of the recording medium, made of a metal or alloy of metals, and cause the effect of his vodorastvorimie in chemically active with respect thereto layer of the recording medium, forming a pita, which is transparent or neproch vodorastvorimie metal or alloy of metals in chemically active with respect thereto layer of the recording medium as the latter is chosen based alloy compounds of elements of the sixth group of the Periodic table of elements with main group elements of the fourth - the fifth group.

 

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