Optical storage medium

 

The invention relates to the accumulation of information. The optical storage medium includes a substrate made of glass, polycarbonate, polymethylmethacrylate (PMMA) and resin based on acrylate having the structure of the roughness on the step between tracks of 0.3-0.4 μm and a depth of the groove 50-800 angstroms. On the substrate is formed a reflecting layer made of aluminum, Nickel, copper, platinum, silver or gold and having a thickness of 500-2000 angstroms, a first dielectric layer formed on the reflecting layer made of Si3N4or ZnS-SiO2and having a thickness of 100-400 angstroms, a recording layer formed on the first dielectric layer made of TbFeCo, NdTbFeCo or TbFe and having a thickness of 150 to 400 angstroms, a second dielectric layer formed on the recording layer made of Si3N4or ZnS-SiO2and having a thickness of 300-800 angstroms, a protective layer formed on the second dielectric layer made of optically transparent inorganic material or organic material and having a thickness of 5-100 μm, and the lubricating film formed on the protective layer, having a thickness of 1-3 nm and not entering into a chemical reaction with a protective layer. 12 Il.

In the optical data storage system optical pulling tool having a solid immersion lens or a solid immersion lens which performs recording and/or reading information with respect to optical data storage system using near field zone formed between the solid immersion optical system or of the solid immersion lens and an optical data storage system.

Fig.1 and 2 show the existing optical disk used as an optical data storage system, where Fig.1 shows that the existing optical disc is used in conjunction with optical data storage system having katadioptrichesky solid immersion optical system, and Fig.2 having a solid immersion lens refracting type.

According Fig.1 the light beam 1 emitted by the unit 10, the transmission and reception of light reflected from the reflecting mirrors 12 and falls on katadioptrichesky solid immersion optical system 14. Sliding contact 16 that supports a solid immersion optical system 14, aerodynamically moves the solid immersion optical system on an air bearing generated by the relative movement between the optical medium 18 data storage, such as optical disk, and a sliding contact 16. In between the solid immersion optical system 14 and a protective layer 183 of the optical medium 18 data storage is formed an air gap. The interval of the air gap, i.e. the distance between the opposite surfaces of the solid immersion optical system 14 and the optical medium 18 data storage is supported, for example, within one wavelength of the applied light. Preferably, it is maintained substantially less than one wavelength of used light. Katadioptrichesky solid immersion optical system 14 refracts and reflects the light beam 1 is incident from the reflecting mirror 12, and forms a spot PA forms a field near-field in the air gap between the solid immersion optical system 14 and the surface of the optical medium 18 storage.

Optical data storage system shown in Fig.2, includes a focusing lens 24 of the lens and the refractive solid immersion lens 26 instead catadioptrical solid immersion optical system 14 shown in Fig.1. The block 20 of the transmission and reception of light emits light beam 1, having an optimized diameter for the lens 24 of the lens. Reflecting mirror 22 reflects the light beam 1 emitted by the unit 20, the transmission and reception of light towards the lens 24 of the lens. Lens lens 24 focuses the light beam 1 is incident from the reflecting mirror 22, a solid immersion lens 26. The spot beam is focused on the solid immersion lens 26 forms a field near zone between the surface located opposite the optical medium 18 storage, and a protective layer 183 in the optical medium 18 storage. The lens 24 of the lens and the solid immersion lens 26 are supported in sliding contact 28. Sliding contact 28 aerodynamically moves the solid immersion lens 26 and forms an air gap with the interval within one wavelength of the applied light, between the solid immersion lens 26 and the optical medium 18 storage like the UK spot beam is formed at the site of formation of the field near zone, which is the predetermined position on the surface of the solid immersion optical system 14 or the solid immersion lens 26, which is opposite the optical medium 18 storage. In the General case, the system shown in Fig.1 or 2, uses a target spot beam corresponding to a numerical aperture (CHA), equal to at least the unit, for recording or reading information with respect to the optical medium 18 storage. When used, the light has a wavelengthmaking 650 nm, the light beam, which forms a spot of the beam at the site of formation of the field near zone, passes the air gap with an interval of approximately 110 nm and a protective layer 183 a thickness of 70-90 nm and is transferred to the recording layer of the optical medium 18 storage. The recording layer is located between the protective layer 183 of the optical medium 18 storage and substrate 181. The light beam reflected from the recording layer passes through the protective layer 183 and the air gap and is transferred to the solid immersion optical system or a solid immersion lens 26.

In General, according to the laws of refraction and total reflection of light entering at a large numerical aperture, full of the th immersion lens 26, i.e., the site of formation of the field near zone is transmissive optical surface adjacent to the environment 18 storage. Therefore, when the interval of the air gap more wavelengthused light, optical medium 18 storage located at the site, outside of the near field. Thus, the light entering into a large numerical aperture, not involved in the formation of the spot beam on the optical medium 18 storage. In other words, the numerical aperture of a light beam that is involved in the formation of the spot beam in the optical medium 18 storage becomes less than “1” when passing through the air gap. As a result, the spot size of the light beam focused on the environment, 18 storage, when the light passing through an air gap having a gap greater than the wavelength of used light, becomes larger than the spot size of the beam formed at the site of formation of the field near-field solid immersion optical system 14 or the solid immersion lens 26. However, when the interval of the air gap sufficiently smaller than one wavelength of used light, preferably/4, the spot size is on the site of formation of the near field zone. Therefore, under this condition the optical data storage system shown in Fig.1 or 2, can write or read information with a high density in relation to the recording layer of the optical medium 18 storage using a solid immersion optical system 14 or the solid immersion lens 26.

Fig.3 shows a plot of the formation of the field near zone between the surface of the solid immersion optical system 14 or the solid immersion lens 26 and the protective layer 183 of the optical medium 18 storage. Interval RSZ (the distance from the system to the protective layer) from the surface of the solid immersion optical system 14 or the solid immersion lens 26 located opposite the optical medium 18 storage, until the protective layer 183, more precisely to the recording layer becomes less than one wavelength of the applied light, and the recording layer in the medium 18 store placed within the distance, providing the field effect of the near zone.

Variant of an existing optical disc is described in U.S. patent No. 5470627. In the case where the above-mentioned existing optical disk is, for example, a magneto-optical disk, the disk includes a reflective layer, the first of Her on a conventional substrate. A reflective layer made of metal, for example aluminium, of a thickness of 500-1000 angstroms (50-100 nm). The first dielectric layer is made of aluminum nitride or silicon nitride with a thickness of 150-400 angstroms (15-40 nm). The recording layer is made of an alloy of rare earth metals and transition metals group, such as TbFeCo, thickness 150-500 angstroms (15-50 nm). Finally, a protective layer is silicon nitride Si3N4the thickness of 400-800 angstroms (40-80 nm).

However, when using above an existing optical disk, an optical data storage system is faced with the following two problems. These problems are equally take place in the data storage system that includes a solid immersion optical system 14, and the data storage system that includes a solid immersion lens 26. Therefore, for convenience of explanation, these problems will be described in connection with an existing optical disk and solid immersion lens 26.

First of all, the problem consisting in the fact that the light beam reflected from the recording layer on the existing optical disc having the above structure, contains noise due to interference, will be described with reference wet, reflected from the air gap (PV)” (beam air), illustrates the light beam totally reflected from the site of formation of the field near-field solid immersion lens 26 and the air gap between the solid immersion lens 26 and the optical medium 18 storage, and light reflected from the recording layer (PZ) (recording beam), illustrates the light beam reflected from the recording layer in the optical medium 18 storage. When the solid immersion lens 26 has a refractive index of 1.8, the total reflection angle average of 56.3 degrees on the solid immersion lens 26 corresponds to the numerical aperture of 0.83. Fig.5 shows the characteristics of angle-reflectance of the solid immersion optical system 14 or the solid immersion lens 26 in respect of the three intervals of the air gap. In Fig.5 curves (a) show the characteristics of angle-reflectance in relation to the spacing of the air gap 50 nm, curves (b) show the characteristics of angle-reflectance in relation to the spacing of the air gap 100 nm and curves (C) show characteristics of angle-reflectance in relation to the spacing of the air gap 150 nm. Additional to the research Institute for p-polarized light beam, and the curves denoted by “-” (solid line) shows the characteristics of angle-reflectance in relation to s-polarisavenue light beam. The angle measured on the horizontal axis indicates the angle of incidence of a light beam passing in the air gap of the solid immersion lens 26. For example, when the interval of the air gap existing between the optical medium 18 storage and a solid immersion lens 26 becomes larger than the wavelength of used light, part of a light beam having an angle greater than the angle of total reflection 56.3 degrees, in particular of the light beam, which is included in a higher numerical aperture, for example a numerical aperture of 1.2 or more of a light beam passing from the solid immersion lens 26 to the environment 18 storage is not passed through an air gap, and is totally reflected at the site of formation of the field near zone or inside the air gap. As can be seen from Fig.5, showing the reflection coefficient in relation to the numerical aperture of 1.5, the light reflected from the air gap RO, has a relatively high reflectivity. In addition, since the air gap and the recording layer are very blisks), is interference. Eventually the light reflected from the air gap (PV), acts as noise in the ratio of light reflected from the recording layer (PZ).

Now with reference to Fig.6 will be described problem caused by the optical medium 18 storage, which is done at high density. In the case where the optical medium 18 storage is made as an optical storage medium for high density recording of information on the substrate 181 create grooves or notches of a width of 100-150 nm. The reflecting layer or the recording layer, on which in fact is recorded information, in turn, is applied to the grooves or recesses by means of the coating process. In addition, the recording layer to form a protective layer 183 a thickness of 150-200 nm. According Fig.6 structure roughness 185 formed in the form of grooves or recesses on the substrate 181, shown in the form of a wedge or a well. Since the depth of the recording layer, a protective layer 183, greater than the width of the grooves or notches, the light beam 1 is incident from the solid immersion optical system 14 or the solid immersion lens 26 onto the optical medium 18 storage does not have grooves or notches, or rather the recording layer, but is reflected ublis the recording and/or reading information with respect to environment 18 high density storage.

To solve the above problems, the present invention aims to create an optical storage medium, comprising an optical transmissive layer having the desired thickness between the solid immersion optical system or of the solid immersion lens and a recording layer formed in the optical storage medium so that the above-described light reflected from the air gap, did not act as noise in the ratio of light reflected from the recording layer, with the purpose of sharing with the optical pulling tool having a solid immersion lens or a solid immersion lens for recording or reading information.

Another object of the present invention to provide an optical storage system comprising an optical pulling tool for recording information on an optical storage medium or reading information therefrom.

To solve this task according to the present invention is an optical storage medium for storing therein information used in conjunction with optical pulling tool having a focusing optical system, the optical storage medium includes a recording of yuusha optical system, and the recording layer is smaller than the wavelength of used light, and the thickness of the protective layer is greater than the wavelength of used light.

To solve this task according to the invention also provides an optical storage medium for storing therein information used in conjunction with optical pulling tool having a focusing optical system for forming a field near zone, the optical storage medium includes an optical transmissive layer having a thickness greater than one wavelength of used light, and a recording layer which is applied onto one surface being opposite from another surface of the optical transmissive layer, located opposite the focusing optical system.

To solve this task according to the present invention is also provided an optical data storage system for recording or reading information with respect to the optical storage medium using an optical pulling tool, an optical data storage system includes an optical pulling tool comprising a focusing lens, forming a field near zone, and the optical transmissive layer having a thickness greater than one wavelength of ispolzovat, located opposite the other surface of the optical transmissive layer located opposite the focusing lens.

According to the present invention is also provided an optical data storage system for recording or reading information with respect to the optical storage medium using an optical inimately, optical data storage system containing the optical inimately comprising first and second optical simatai, which includes a focusing optical system forming the near field zone, and the optical storage medium, comprising a single optical storage medium, containing the first optical transmissive layer having one surface opposite to the first optical pulling tool, the second optical transmissive layer having one surface being opposite the second optical pulling tool, and the first and second recording layers, which are respectively applied to the other surface of the first optical transmissive layer and the other surface of the second optical transmissive layer, in which the first and second optical transmissive layers have a thickness greater than one wavelength of used light, and the distance of the surrounding layer is smaller than one wavelength of the used light beam.

The objectives and other advantages of the present invention will become more apparent through the detailed description of the structures and operations according to the present invention with reference to the accompanying drawings, in which:

Fig.1 shows an existing optical storage system, which includes the existing optical disk and katadioptrichesky solid immersion lens;

Fig.2 shows an existing optical storage system, which includes the existing optical disk and solid immersion lens refracting type;

Fig.3 shows a plot of the formation of the field near-field optical data storage system shown in Fig.1 or 2;

Fig.4 is a view for explaining the light reflected from the air gap, and light reflected from the recording layer, which are generated in the system shown in Fig.2;

Fig.5 is a graphical view showing the characteristics of the angle of the reflection coefficient corresponding to the change of the air gap in the optical data storage system shown in Fig.1 or 2;

Fig.6 is a view for explaining the case when the structure is in optical data storage system, it is shown in Fig.1 or 2;

Fig.7 shows an optical data storage system related to the first implementation variant of the present invention, which is used in conjunction with optical data storage system, comprising katadioptrichesky solid immersion lens;

Fig.8 shows an optical data storage system corresponding to the second implementation variant of the present invention, which is used in conjunction with optical data storage system that includes a transmissive solid immersion lens;

Fig.9 is a view for explaining the case when the structure of the roughness formed on the substrate of the optical disk is detected by the optical pulling tool in optical data storage system shown in Fig.8;

Fig.10 shows an optical data storage system that meets the third variant of implementation of the present invention; and

Fig.11 shows a hierarchical structure of an optical disk corresponding to the first variant implementation of the present invention; and

Fig.12 is a graphical view showing the change of the force of adhesion in relative motion with depth texturing in the optical disk shown in Fig.11.

According Fig.7 optical data storage system related to the first implementation variant of the present invention, includes an optical pulling tool having a block 10 of the transmission and reception of light, a reflecting mirror 12, katadioptrichesky solid immersion optical system 64, the slider 66 and the optical medium 68 storage. Since the elements shown in Fig.7 perform the same optical function as the elements having the same reference numbers shown in Fig.1, their detailed description will be omitted.

Optical medium 68 storage includes a substrate 681, optically transparent protective layer 685 and a recording layer located between the substrate 681 and a protective layer 686, which, in General, has the form of a disk. In the case of a rewritable optical medium 68 storing the recording layer is formed by coating the surface of the substrate 681 optically sensitive material. Optical medium 68 storage is made in such a way that the light beam emitted from katadioptrichesky solid immersion optical system 64, passed a protective layer 686, having a contrast to the existing environment 18 storage having a thin protective layer 183, optical medium 68 storage has a protective layer 686, thicker than the wavelength of used light. Between the protective layer 686 and a solid immersion optical system 64 includes an air gap. Therefore, the surface of the solid immersion optical system 64 directed toward the reflecting mirror 12 has an aspherical surface, forming on the recording layer of the optical medium 68 storage minimized spot beam, taking into account the thickness and the refractive index of the protective layer 686.

Alternative katadioptrichesky solid immersion optical system 64 is made in a form and of a material similar to the shape and material of the solid immersion optical system 14 shown in Fig.1. According to the above-described shape is slightly modified considering the fact that the thickness of the substrate is greater than one wavelength of the applied light.

The light beam 1 passing from the reflecting mirror 12 to the solid immersion lens 64, and is refracted and reflected in the solid immersion lens 64 and forms a spot beam in the center of the surface opposite to the protective layer 686 environment 68 storage, as shown in Fig.7. Sliding the 68 storage due to the relative motion of the rotating environment 68 storage & moving contact 66 and forms an air bearing between opposite each other with the surfaces of the environment 68 storage & moving contact 66. In this case, the interval of the air gap occurring between the surfaces of the solid immersion lens 64 and the protective layer 686, supported by a smaller wavelength, which has used the light, i.e. the light beam 1 emitted from a block 10 of the transmission and reception of light. In the optimal case, if the interval of the air gap is maintained less than 1/4 wavelength, the interference phenomenon is reduced, to thereby obtain an excellent signal/noise.

The light beam incident on Wednesday 68 storage, passes through the optically transparent protective layer 686 and reaches the recording layer. Thus, when the optical medium 68 storage made in the form of optical storage medium to high density, i.e., the optical medium 68 has grooves or notches of a width of 100-150 nm and a protective layer 686 thickness of 150-200 nm depth from the surface environment 68 of the store, facing the air gap, to the groove or grooves is greater than the width of the grooves or notches. Thus, the system shown in Fig.7, can write or read information with respect to the optical storage medium to high density.

Fig.8 shows an optical data storage system, jinsu 74 of the lens, refractive solid immersion lens 76 and sliding contact 78, instead of the solid immersion optical system 64 and the sliding contact 66, shown in Fig.7. Fig.9 is an enlarged view of the optical medium 88 storage and a solid immersion lens 76, shown in Fig.8.

Lens 74 lens focuses the light beam incident from the reflecting mirror 22 on the refractive solid immersion lens 76. According to this variant implementation in contrast to the above-described environment 68 optical storage medium 88 storage includes a substrate 881, having an optical characteristic of the transmission, on one surface, which is opposite the solid immersion lens 76, and a protective layer 883 on the other side, remote from the solid immersion lens 76. Grooves or recesses for recording information are formed on the substrate 881 optical medium 88 storage. The structure of the roughness 885 formed by grooves or notches formed on the optical transmissive substrate 881, illustrated in the form of a wedge or a well, concave toward the substrate 881, as shown in Fig.9.

Solid immersion lens 76 forms on the recording layer of the optical medium 88 storage is against environment 88 storage, using a light beam incident from the lens 74 of the lens. In this case, the lens 74 of the lens and the solid immersion lens 76 form a spot beam, providing a numerical aperture equal to at least the unit, above the surface of the solid immersion lens 76. Sliding contact 78 holds the solid immersion lens 76 on the surface of a rotating environment 88 storage and maintains the spacing of the air gap between the surfaces of the solid immersion lens 76 and the substrate 881 equal to 1/4 or less of the wavelength of the light beam emitted by the unit 20, the transmission and reception of light.

When the interval of the air gap is 1/4 or more of the wavelength of the used light, light beam, providing a numerical aperture equal to one or more is totally reflected from the air gap, when the light beam forming a spot of the beam on the surface of the solid immersion lens 76, opposite the environment 88 storage, passes through the air gap. Thus, only the light beam, providing a numerical aperture smaller units, is transferred to the optical environment 88 storage. The spot size of the light beam reaching the environment 88 storage, mills used light, light beam with a numerical aperture unit or more is transferred to the environment 88 storage and spot size of the beam becomes small. In addition, since the structure of the roughness 885, in which is formed a recording layer, is removed from the air gap compared to the existing optical storage medium, the light reflected from the recording layer is protected from interference caused by light Bouncing off of the air gap. Thus, the optical data storage system shown in Fig.8, can write or read information with respect to the optical medium 88 storage with excellent signal/noise ratio. In Fig.9 solid arrow indicates “light reflected from the recording layer, reflected from the recording layer of the medium 88 storage, and the dotted arrow indicates “light reflected from the air gap, reflected from the surface of the solid immersion lens 76, the air gap and the substrate 881.

Fig.10 shows an optical data storage system in accordance with the third variant of realization of the present invention. The system shown in Fig.10, includes bilateral optical medium 90 storage. Optical medium 90 storage is made in such a way that p is are with each other. Otherwise, the environment 90 storage is made in such a way that the protective layers 883 two sheets of optical media 88 storage shown in Fig.8, are adjacent to each other or touch each other, or two sheets of optical media storage are merged into one, then there is only one protective layer 883. The system shown in Fig.10, includes a pair of blocks 20 of the transmission and reception of light, a reflecting mirror 22, the lens 74 of the lens, the solid immersion lens 76 and sliding contacts 78 to the optical medium 90 storage. Because the expert can understand the operation of the system shown in Fig.10, of the above variants of implementation, its detailed description is omitted.

Since the production of the optical data storage system for recording and/or reading information with respect to the optical medium 90 storage shown in Fig.10, using the system shown in Fig.7 or 8, it is also clear average professional, its detailed description is omitted.

According to the above-described first embodiment implementing the thickness of the protective layer 686 can be, in principle, arbitrarily large, but it is enough that the air gap between the solid immersion optical system 64 and slowww aperture, determine the beam spot size, the thickness of the protective layer 686 may be at least from a few microns to several hundred microns. For example, the thickness of the substrate digital versatile disk (WCD) is 0.6 mm, i.e. 600 μm. It is clear that the above-mentioned thickness provides greater practicality.

In addition, although the optical axis of the solid immersion optical system 64 or solid immersion lens 76 is not perpendicular to the surface of the optical medium 68 or 88 storage, and inclined to it, if the distance between the solid immersion optical system 64 or solid immersion lens 76, the most remote from the surface of the optical medium 68 or 88 storage, and surface optical medium 68 or 88 storage is within the wavelength of the used light, the light beam reflected from the inner surface of the air gap or from the inner surface of the storage medium between the air gap and the recording layer is not valid, as the noise, the light beam reflected from the recording layer. In particular, if the size of the light beam focused solid immersion optical system 64 or solid immersion Lismore to achieve excellent performance, recording or playback in relation to the optical medium 68 or 88 storage, having on its surface dust or damage.

Fig.11 shows a hierarchical structure of an optical disk, which implements the optical medium 68 storage shown in Fig.7. The optical disk shown in Fig.11 is a magneto-optical disk of high density having a recording capacity of 20 GB or more, which includes a substrate 681 and a reflective layer 682, the first dielectric layer 683 recording layer 684, the second dielectric layer 685, a protective layer 686 and lubricating film 687, which in turn is applied to the substrate 681. The substrate 681 is made of glass, polycarbonate, PMMA and resin based on acrylate and has a structure roughness with a step between tracks of 0.3-0.4 μm and a depth of the groove 50-800 angstroms (5-80 nm). A reflective layer 682 is made of aluminum (Al), Nickel (Ni), copper (cu), platinum (Pt), silver (Ad) and gold (AU) and has a thickness of 500-2000 (50-200 nm). The first and second dielectric layers 683 and 685 are made of Si3N4, ZnS-SiO2and so on the First dielectric layer 683 has a thickness of 100-400 angstroms (10-40 nm) and the second dielectric layer 684 has a thickness of 300-800 angstroms (30-80 nm). The recording layer 684 is made of TbFeCo, NdTbFeCo, TbFe, etc. for the implementation of the magneto-optical recording and has a thickness of 150-400 angstreich material. According to this variant implementation of the protective layer 686 is done by applying a resin based on acrylate by centrifugation and has a thickness of 5-100 μm. The surface protective layer 686 processed texturing to reduce clumping, called static friction. The interval between the bumps in the texturing process is 20-60 μm and the depth of the texturing or the height of the convexity is 5-50 angstroms (0.5-5 nm). The lubricant film 687 formed on the protective layer 686, has a thickness of 1-3 nm and is a lubricant that does not enter into chemical reaction with a protective layer 686 and made of PFPE (performability). As grease is used Fomblin Z Dol or Fomblin 2001, which are used in hard disk drives. As a solution, mixed with grease, is used Galden SV.

According Fig.12 in the case when the surface of the optical disk is not subjected to texturing, is sticking. However, when it comes to texturing, which has a depth of 5 angstroms (0.5 nm) or more, the adhesion is reduced.

In the present invention was used the solid immersion optical system or a solid immersion lens. However, the average professional is obvious that instead of a solid IGU optical system, if the air gap between the radiating surface of the optical system and a protective layer of the storage medium is less than one wavelength of used light, and the thickness of the protective layer is greater than the wavelength of used light.

According to the above-described variants of the implementation of the reflecting mirror 12 or 22 plays the role of a vector of a light beam emitted from a block of 10 or 20 transmission and reception of light on the solid immersion lens and the vector of a light beam incident from the solid immersion lens to block the transmission and reception of light. Thus, instead of reflecting mirrors can be used in various optical elements, which can change the optical path, such as a prism.

According to the above-described optical data storage system that meets the present invention uses an optical storage medium, the thickness of the transmissive layer which is placed between the radiating surface of the focusing optical system, such as a solid immersion optical system or a solid immersion lens, and the recording layer is greater than the wavelength of used light. Thus, according to the present invention the light beam reflected from within the major gap and the recording layer, not acting as noise in relation to the light beam reflected from the recording layer. In addition, since according to the present invention the thickness of the protective layer or substrate, which becomes the outer surface of the optical storage medium can be increased, it is possible to accurately record or read information on the optical storage medium having dust or damage.

Claims

The optical storage medium containing a substrate made of glass, polycarbonate, polymethylmethacrylate (PMMA) and resin based on acrylate, and having a structure roughness with a step between tracks of 0.3 - 0.4 μm and a depth of the groove 50 to 800 angstroms, a reflecting layer formed on a substrate made of aluminum, Nickel, copper, platinum, silver or gold and having a thickness of 500-2000 angstroms, a first dielectric layer formed on the reflecting layer made of Si3N4or ZnS-SiO2and having a thickness of 100-400 angstroms, a recording layer formed on the first dielectric layer made of TbFeCo, NdTbFeCo or TbFe and having a thickness of 150 to 400 angstroms, a second dielectric layer formed on the recording layer made of Si3N4the, made of optically transparent inorganic material or organic material and having a thickness of 5-100 μm, and the lubricating film formed on the protective layer, having a thickness of 1-3 nm and not entering into a chemical reaction with a protective layer.

 

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5 cl, 1 tbl, 3 ex

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8 cl, 12 dwg

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EFFECT: improved efficiency of recording/reproducing systems and information preservation on basis of WORM-type optical disk with fluorescent reading.

3 cl, 2 dwg, 3 ex

FIELD: engineering of information carriers and appropriate reading and recording devices.

SUBSTANCE: variants of information carrier contains information about its configuration recorded thereon as well as information about inertia moment of current information carrier. Recording device contains means for determining physical characteristics of utilized information carrier by reading information about configuration and information about inertia moment from wobbulated groove of information carrier, and recording control means, applying corrections for performing recording process in accordance to physical characteristics of information carrier. Reading device contains means for determining physical characteristics of information carrier by reading information about configuration and information about inertia moment, and recording control means, applying corrections for performing reading operation in accordance to physical characteristics of information carrier.

EFFECT: simple and precise process of determining physical characteristics of information carrier, possible adjustment of reading and recording operations.

4 cl, 93 dwg

FIELD: engineering of devices for information storage.

SUBSTANCE: device for information storage contains disks with information carrying layer mounted with possible rotation relatively to common axis, disks rotation drive, reading and/or recording head, positioned on the side of end of one of edge disks and directed towards the latter by its active zone, and also drive for moving aforementioned head in plane, parallel to rotation plane of disks. Information carrying layer at least on one disk, positioned on the side of head, is made with forming of window, transparent for signal, emitted and/or read by head and having shape matching movement trajectory of head, and disks rotation drive is made with possible independent rotation of disks and holding in position, providing for positioning of window in front of active zone of head.

EFFECT: increased efficiency.

8 cl, 4 dwg

FIELD: engineering of data carrier, and of recording and reading devices, compatible with such a data carrier.

SUBSTANCE: each variant of aforementioned data carrier contains recording track, formed by a stream of recesses on the surface of carrier, data of recess represent information recorded on it, which contains main data and sub-code. In accordance to one of variants, information about physical characteristics of current data carrier is recorded in sub-code. In accordance to other variant, data carrier contains multiple individual reading/recording zones, physical characteristics of which are different, and each one of aforementioned zones contains zones for input, zones for program and ones for output, while in sub-code of input zone of each one of aforementioned zones, information about physical characteristics of appropriate individual reading/recording is recorded as well as information about starting position of input zone of next individual reading/recording zone. Each one of variants of recording device contains a certain device for determining physical characteristics of aforementioned data carrier by reading information about these from sub-code, and each variant of reading device contains aforementioned determining device and device for controlling reading.

EFFECT: increased quality of reading and writing of information.

6 cl, 94 dwg

FIELD: optical recording technologies, namely, engineering of two-layered optical disks with high recording density, and of devices for recording/reproducing from them.

SUBSTANCE: two-layered optical disk with high recording density contains first recording layer and second recording layer, positioned on one side of central plane, dividing the disk in half along thickness, close to surface, onto which light falls. First thickness of substrate from surface, onto which light falls, to first recording layer has minimal value over 68,5 micrometers, second thickness of substrate from surface, onto which light falls, to second recording layer has maximal value less than 110,5 micrometers, while refraction coefficient is within range 1,45-1,70.

EFFECT: minimization of distortion of wave front, provision of possibility of more precise recording of signals onto optical disk or reproduction of signals from optical disk.

8 cl, 10 dwg

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