Two-layered optical disk with high recording density

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

 

1. The technical FIELD TO WHICH the INVENTION RELATES.

The present invention relates to a two-layer optical disk with a high recording density having first and second recording layers located on one side of the Central plane dividing the disk in half in thickness, near the surface of the disk.

2. The LEVEL of TECHNOLOGY

Figure 1 shows the structure of a conventional multi-function digital disc (DVD). According to Fig 1 DVD, indicated by the position number 10, has a diameter of 120 mm and a thickness of 1.2 mm and is made with a Central hole having a diameter of 15 mm, and the landing zone with a diameter of 44 mm and designed to clamp the supporting disc and the retainer forming part of the apparatus for optical disks.

DVD 10 has a recording layer in which data is written in the form of a combination of depressions. Layer DVD burner 10 is located at a depth of approximately 0.6 mm from the disc surface facing the objective lens 1 of the optical head, which is part of the apparatus for optical disks. The objective lens 1 of the optical head for DVD 10 has a numerical aperture equal to 0.6.

Figure 2 shows the structure of a single-layer DVD with high recording density. According to figure 2 a single-layer DVD with high recording density, indicated by the position number 20, has a diameter of 120 mm and a thickness of 1.2 mm with a Central hole having a diameter of 15 mm, and areas of the second landing, with a diameter of 44 mm and designed to clamp the supporting disc and the retainer forming part of the apparatus for optical disks. A single-layer DVD with 20 high-density recording layer has a recording data located at a depth of approximately 0.1 mm from the disc surface facing the objective lens 2 of the optical head, which is part of the apparatus for optical disks.

The objective lens 2 of the optical head for a single-layer DVD with 20 high-density recording has a numerical aperture is 0.85, which is somewhat larger numerical aperture of the objective lens 1 for the DVD 10. The objective lens 2 of the optical head takes the short wavelength laser beam with the wavelength, the smaller the wavelength used in DVD 10 for playback or recording data with high density. That is, for playback or recording data with high density DVD 10 uses a laser beam with a wavelength of 650 nm for DVD 20 uses a laser beam with a wavelength of 405 nm.

Due to the generation of short-wavelength laser beam and to increase the numerical aperture of the lens, especially when the objective lens 2 of the optical head near the recording layer single-layer DVD 20 with a high recording density, it is possible to form a small beam spot on the depression of high-density data by intense focusing of a laser l is cha and to minimize the length of the layer, transparent to the wavelength of the laser beam. In the result, it is possible to minimize changes in properties and appearance of aberration of the laser beam.

In recent years, many companies have developed a two-layer optical disk with a high recording density, in particular a double-layer DVD with high recording density or double-layer drive high-density recording using a blue laser - Blu-ray Disc (hereinafter - the" double-layer BD with high density recording")issued a replacement of the single-layer DVD with high recording density. Two-layer optical disk with a high recording density can be used to record and store a large number videoediting for a long time, despite the fact that the capacity of this drive twice the capacity of single-layer DVD with high recording density.

However, as described above, in the case of two-layer optical disk with a high recording density cannot effectively limit the distortion of the wavefront, which inevitably occurs across the disk due to spherical aberration caused by thickness variation of the substrate from the surface of the transparent substrate, on which light falls to the respective first and second recording layers, and also due to the coma caused by the tilt of the objective lens included in the optical head. Hence, the urgent need to solve the problem of distortion of the wave front for a two-layer optical disk with a high recording density.

3. DISCLOSURE of INVENTIONS

The aim of the present invention is to provide a new two-layer optical disk with a high recording density having first and second recording layers, which would be structured in order to minimize the occurrence of distortion of the wave front due to changes in the thickness of the substrate from the surface of the transparent substrate, on which light falls to the respective first and second recording layers. Examples of two-layer optical disk with a high recording density are double-layer DVD, and BD media with high recording density.

Another purpose of this invention is the provision of a new two-layer optical disk with a high recording density having first and second recording layers and a structure that would minimize the distortion of the wave front across the optical disc due to the spherical aberration caused by thickness variation of the substrate from the surface of the transparent substrate, on which light falls (i.e. top layer)to the first and second recording layers, respectively, and also due to the coma caused by the tilt of the objective lens included in the optical head.

According to the present invention the above and other objectives can be achieved by providing a two-layer optical disk with high density is STU records with the first and second recording layers located on one side of the Central plane dividing the disk in half in thickness, near the surface of the disc, and the first thickness of the substrate from the surface of the transparent substrate, on which light falls before the first recording layer corresponds to a value obtained by subtracting half the distance between the first and second recording layers of the thickness of the substrate from the surface of the transparent substrate, on which light falls to the recording layer in a single-layer optical disk with a high recording density, and the second thickness of the substrate from the surface of the transparent substrate, on which light falls to the second recording layer corresponds to a value obtained by adding half of the distance between the first and second recording layers to the thickness of the substrate from the surface of the transparent substrate, on which light falls to the recording layer in a single-layer optical disk with a high recording density.

According to the present invention the above and other objectives can be achieved by providing a two-layer optical disk with a high recording density having first and second recording layers located on one side of the Central plane dividing the disk in half in thickness, near the surface, on which light falls, the first thickness of the substrate from the surface of the transparent substrate, to the which light falls, before the first recording layer is not less than 70 μm, the second thickness of the substrate from the surface of the transparent substrate, on which light falls to the second recording layer does not exceed 108 μm, and the distance between the first and second recording layers is 19±5 microns.

Preferably the thickness of the substrate from the surface of the transparent substrate, on which light falls before the first recording layer in a single-layer optical disk with a high recording density can be 0.1 mm, the Distance between the first and second recording layers may be of 0.02 mm, the First and second thickness of the substrate can be respectively 0.09 mm and 0.11 mm

Preferably the first and second thickness of the substrate can be variables, in which the index of refraction n of the transparent substrate varies in the range of 1.45-1.70 to. If the refractive index n of the transparent substrate is 1.60, the first and second thickness of the substrate can be respectively 79,5±5 μm and 98,5±5 microns.

4. BRIEF DESCRIPTION of DRAWINGS

The above and other objectives, features and other advantages of the present invention will be better understood from the following detailed description, supplemented by the accompanying drawings.

Figure 1 shows the structure of a standard DVD;

figure 2 shows the structure of a single-layer DVD with high recording density in the General case;

on IG shows an example of the structure of two-layer optical disk with a high recording density, explaining the present invention;

figure 4 shows graphs for comparing changes in the distortion of the wave front caused by spherical aberration, depending on changes in the thickness of the substrate from the surface of the transparent substrate, on which light falls to the recording layers in the two-layer optical disk with a high recording density;

figure 5 shows the structure of a two-layer optical disk with a high recording density according to the present invention;

on figa-6C shows graphs for comparing changes in the distortion of the wave front caused by the tilt of the objective lens, depending on changes in the thickness of the substrate from the surface of the transparent substrate, on which light falls to the recording layers in the two-layer optical disk with a high recording density;

figure 7 presents a graph showing the range of variation of the thickness of the substrate from the surface of the transparent substrate to the first and second recording layers, and is applicable to two-layer optical disk with a high recording density according to the present invention; and

on Fig shows the structure of a two-layer optical disk with a high recording density according to the exemplary embodiment of the present invention.

5. EXAMPLES of carrying out the INVENTION

Before the description of a new two-layer optical disk with a high recording density with the according to the present invention first will be described a dual-layer DVD with high recording density or double-layer BD with high recording density in the General case.

Usually double-layer DVD with high recording density, indicated by the position number 30, has a diameter of 120 mm and a thickness of 1.2 mm and is made with a Central hole having a diameter of 15 mm, and the landing zone with a diameter of 44 mm and designed to clamp support plate and clamp included in the device for optical disks. Dual layer DVD 30 high density recording contains the first recording layer, is performed on the substrate layer by using the standard single-layer DVD with high recording density, and a second recording layer, located at a distance of 0.02 mm from the first recording layer. As shown in detail in figure 3, the first layer recording to dual-layer DVD 30 with a high recording density is located at a depth of 0.1 mm from the disc surface facing the objective lens 2 of the optical head, which is part of the apparatus for optical disks, and the second recording layer is located at a depth of 0.12 mm from the disc surface. In addition, this apparatus includes a controller to control the specified head to write data on the first or second layer of the optical recording medium or reproducing data from it.

The objective lens 2 of the optical head for a two-layer optical disk with a high recording density has a numerical aperture is 0.85, and adapted to the laser beam 4 with a wavelength of 405 nm for play or for the IRS data with high density on the first and second recording layers is exactly the same as this is done for a single-layer DVD with 20 high-density recording.

If reproducing or recording data on the recording layers using an optical head with a numerical aperture of 0.85 and a wavelength of 405 nm, the maximum defocus the beam due to the thickness of the substrate from the surface of the transparent substrate, on which light falls to the recording layers is significantly reduced in accordance with equation 1.

where λ is the wavelength, NA is a numerical aperture, a Δt is the thickness of the substrate from the surface of the transparent substrate, on which light falls to the layers of the recording.

It should be noted that the increase in numerical aperture of the objective lens and the decreasing wavelength lead to a significant reduction allowable limit of the defocusing of the beam due to changes in the thickness of the substrate from the surface of the transparent substrate, on which light falls to the recording layers compared to the same limit for a normal DVD. This substantial reduction of the permissible defocus ultimately leads to increased noise in the system.

In the case when the first recording layer is made at a distance of 0.1 mm from the substrate, and the second recording layer at a distance of 0.08 mm from the substrate, provides greater allowable limit of the defocusing of the beam than in the case where the first and second layers are located on the leg from the substrate respectively 0.1 mm and 0.12 mm

Therefore, from the point of view of the permissible defocus it is desirable that the thickness of the second recording layer was less than the thickness of the first recording layer. I.e. the second layer records must be accommodated within the thickness of 0.1 mm

In addition, when determining the thickness of the corresponding layer records beyond the allowable limit of the defocusing consider the spherical aberration, coma and distortion of the wave front.

First, when it is assumed that the thickness of the substrate from the surface of the transparent substrate, on which light falls before the first recording layer is 0.1 mm, and the distortion of the wavefront of the beam spot formed on the recording layer is zero, the distortion of the wavefront varies depending on the thickness of the substrate from the surface of the transparent substrate, on which light falls to the second recording layer, as shown in the graphs presented in figure 4. For example, if the thickness of the substrate from the surface of the transparent substrate, on which light falls to the second recording layer is 0.08 mm or 0.12 mm, the distortion of the wave front has a mean value of approximately 0.18 toλ.

As a rule, so that the optical system is not there would be a large error, the total aberration must have a mean value < 0.07λ. Experience shows that in a system with optical the head does not have problems, if the total aberration of the optical head in the real system has a mean value less than 0,075λ.

From this moment forth, the present invention will be considered on the assumption that the mean value of the total aberration is less than 0,075λ.

As shown in figure 4, when the distance from the substrate to the second recording layer is 0.08 mm or 0.12 mm, the mean value of the total aberration greatly exceeds the maximum allowable value of 0.075λ for the real system.

As was stated above, if the thickness of the substrate from the surface of the transparent substrate, on which light falls to the first and second recording layers is respectively 0.1 mm and 0.12 mm or 0.1 mm and 0.08 mm, the mean value of the distortion of the wave front is 0,18λthat is unacceptable for a real system.

Meanwhile, as stated above, there are several solutions to compensate for distortion of the wave front. That is, by precisely controlling the position of the collimator lens 3, a part of the apparatus for optical disks, or installed in this unit additional LCD or similar device, the distortion of the wavefront can be reduced to the RMS value of approximately 0,045λif the mean thickness is the LCD from the surface of the transparent substrate, on which light falls to the second recording layer is 0.08 mm or 0.12 mm

Figure 5 shows the structure of a two-layer optical disk with a high recording density according to the present invention. As can be seen in figure 5, the two-layer optical disk with a high recording density, indicated by the position number 40 has first and second recording layers. First the thickness of the substrate 't1' from the surface of the transparent substrate, on which light falls before the first recording layer corresponds to a value obtained by subtracting half the distance between the first and second recording layers of the thickness of the substrate from the surface of the transparent substrate, on which light falls to the recording layer in a conventional single-layer optical disk with a high recording density.

The second thickness of the substrate 't2' from the surface of the transparent substrate, on which light falls to the second recording layer corresponds to a value obtained by adding half of the distance between the first and second recording layers to the thickness of the substrate from the surface of the transparent substrate, on which light falls to the recording layer in a conventional single-layer optical disk with a high recording density.

That is, dual layer DVD or BD with high recording density according to the present invention has a diameter of 120 mm and a thickness of 1.2 mm and is made with a Central hole having a diameter of 15 mm, and the area in which ADCI, with a diameter of 44 mm and designed to clamp support plate and clamp included in the device for optical disks. Dual layer DVD 40 with a high recording density according to the present invention has a first recording layer located at a depth of 0.09 mm from the disc surface facing the objective lens 2 of the optical head, which is part of the apparatus for optical disks, and the second recording layer, located at a depth of 0.11 mm from the disc surface facing the objective lens 2 of the optical head.

Therefore, for the above conditions with reference to figure 4, when the first and second thickness of the substrate from the surface of the transparent substrate, on which light falls to the first and second recording layers are respectively 0.09 mm and 0.11 mm, the mean value of the distortion of the wave front is approximately 0,08λthat is close to the maximum RMS value of 0.075λacceptable to the real system. Moreover, thanks to the precise adjustment of the collimator lens 3 and the extra LCD or similar device to compensate for distortion of the wave front is reduced to the RMS value of approximately 0,025λ. Thus, it is possible to effectively restrict occurrence of distortion of the wave front of obukov the frame by the thickness of the substrate from the surface of the transparent substrate, on which light falls to the layers of the recording.

On figa-6C shows the graphs for comparison of changes in the distortion of the wave front caused by the deviation of the objective lens, depending on changes in the thickness of the substrate from the surface of the transparent substrate, on which light falls to the recording layers in the two-layer optical disk with a high recording density. On figa-6S spherical aberration caused by thickness variation of the substrate from the surface of the transparent substrate, on which light falls (i.e. top layer)to the recording layers is determined by the linerespectively shown in figa-6S, in the absence of deviation of the objective lens included in the optical head.

Coma arising in position when the objective lens of the optical head has an angle less than 0.6°, is determined by the lineshown in figa-6S, respectively. The distortion of the wave front emerging around the optic disk due to spherical aberration and coma, is determined by the lineshown in figa-6S, respectively.

On figa-6S linebuilt on the substrate of the graph presented on figure 4, and the lineobtained from equation 2.

where t is the thickness, n is the refractive index, NA is the numerical aperture of the objective lens, and α - the angle of deviation.

As a rule, the maximum deviation of the objective lens in the conventional optical system is 0.6, so the coma is applied to this equation on the basis of this value.

That is, the value of the distortion of the wavefront calculated according to equation 3

wherespherical aberration caused by thickness variation of the substrate from the surface of the transparent substrate, on which light falls to the recording layers in the absence of deviation of the objective lens,coma caused by the angle of deviation of the objective lens, not exceeding 0,6°andthe distortion of the wavefront across the disk, due to spherical aberration and coma.

Therefore, as shown in figa, the thickness of the substrate from the surface of the transparent substrate, on which light falls to the first and second recording layers, respectively, should be set in the range of about 70-108 μm to satisfy the condition of the maximum RMS value of the distortion of the wave front 0,075λacceptable in the real system.

This result represents the value obtained considering coefficie is the refractive index of the optical disk, which characterizes the refractive ability of the optical disk.

In particular, this result is based on the refractive index, equal to 1.60.

Moreover, as shown in figv, the thickness of the substrate from the surface of the transparent substrate, on which light falls to the respective first and second recording layers should be set in the range 68,5-106,5 μm to satisfy the condition of the maximum RMS value of the distortion of the wave front 0,075λacceptable in the real system.

Therefore, as shown in figs, the thickness of the substrate from the surface of the transparent substrate, on which light falls to the respective first and second recording layers should be set in the range of about 71,4-110,5 μm to satisfy the condition of the maximum RMS value of the distortion of the wave front 0,075λacceptable in the real system.

Below is a detailed description.

Figure 7 shows a graph showing the range of the thickness of the substrate from the surface of the transparent substrate, on which light falls to the first and second recording layers, applicable to two-layer optical disk with a high recording density according to the present invention. As shown in figa-6C, the thickness of the substrate from the surface of the transparent substrate, on which light falls to the recording layers specifies the I depending on the refractive index of the transparent substrate.

For example, if the refractive index n of the transparent substrate is equal to 1.60, the thickness of the substrate from the surface of the transparent substrate, on which light falls to the recording layers must be in the range of about 70-108 μm to satisfy the condition of the maximum RMS value of the distortion of the wave front 0,075λ.

If the same conditions are assumed for a different refractive index, when the refractive index n of the transparent substrate is equal to 1.45, as shown in figv, the thickness of the substrate from the surface of the transparent substrate, on which light falls to the recording layers must be in the range of about 68,5-106,5 μm to satisfy the condition of the maximum RMS value of the distortion of the wave front 0,075λ.

In addition, if the refractive index n of the transparent substrate is equal to 1.70, as shown in figs, the thickness of the substrate from the surface of the transparent substrate, on which light falls to the recording layers must be in the range of about 110,5 and 71.4 μm to satisfy the condition of the maximum RMS value of the distortion of the wave front 0,075λ.

Finally, the thickness of the substrate from the surface of the transparent substrate, on which light falls before the first recording layer is in the range of about 108±2,5 (or -1,5) μm high, and the thickness of the mean is the LCD from the surface of the transparent substrate, on which light falls to the second recording layer is in the range of about 70 μm +1,4 (or -1,5) μm at least.

Therefore, as can be seen in Fig, which shows the structure of a two-layer optical disk with a high recording density according to the exemplary embodiment of the present invention, the thickness of the substrate from the surface of the transparent substrate, on which light falls before the first recording layer is at least 70 μm, and the thickness of the substrate from the surface of the transparent substrate, on which light falls to the second recording layer is a maximum of 108 microns. The distance between the first and second recording layers is in the range of 19±5 microns.

The following is a more detailed description.

The first and second recording layers can be divided in accordance with the average values of the above quantities, i.e. as boundary values to choose, for example, 89 μm(=(70+108)/2). When the first recording layer has a minimum value of 70 μm, the second layer records must have a value of 89 μm, i.e. the boundary value. When the second recording layer has a size of 108 μm, the first layer should have a value of 89 μm, i.e. the boundary value.

Therefore, the distance between the first and second recording layers you can take is equal to 19 μm. And taking into account the maximum permissible error of making this distance can take is equal to 19±5 μm, which is what I valid value in the current system.

Although the thickness of the substrate can be considered more of the above values, it is desirable that the maximum permissible error was ±5 μm for the fabrication substrate for recording. Therefore, the average distance between the respective layers will be most stable if the distance between the respective layers is maintained equal to 19 μm. That is, if the calculated average value for the respective ranges of the layers, the average values for layers, respectively, of 79.5 μm and 98,5 mm. According to this result the thickness of the substrate from the surface of the transparent substrate, on which light falls to the first and second recording layers, respectively 79,5±5 μm and 98,5±5 microns.

Therefore, as shown in Fig, if the refractive index n of the transparent substrate is equal to 1.60, the thickness of the substrate from the surface of the transparent substrate, on which light falls to the first and second recording layers respectively of 79.5 μm and 98,5 μm, and the distance between the first and second recording layers is set equal to 19+5 microns. In this case, according to the tolerance limit on the distance equal to ±5 μm, the thickness of the substrate from a surface on which light falls to the first and second recording layers, respectively 79,5±5 μm and 98,5±5 microns.

According to the two-layer structure op the practical disk with high recording density, it is possible to effectively limit the distortion of the wave front across the optical disk, due to the spherical aberration arising from changes in the thickness of the substrate from a surface on which light falls to the first and second recording layers, and coma, may occur when the deviation of the objective lens.

Although for illustrative purposes has been disclosed only preferred embodiments of the invention, the specialists will be obvious that various modifications, additions and substitutions without departure from the essence and scope of the invention as set forth in the claims.

As follows from the above description, the present invention is a two-layer optical disk with a high recording density, designed to minimize the distortion of the wave front emerging around the optic disk due to the spherical aberration due to the thickness variation of the substrate from a surface on which light falls to the first and second recording layers, and also due to coma due to the deviation of the objective lens, and to enable more accurate recording signals on an optical disk or play with him.

1. Two-layer optical disk with a high recording density, containing the first recording layer and second recording layer located on one side of the Central plane dividing the disk in half in thickness, near the surface, which falls St is t, the first thickness of the substrate from the surface of the transparent substrate, on which light falls before the first recording layer has a minimum value of more than 70 μm and the second thickness of the substrate from the surface of the transparent substrate, on which light falls to the second recording layer has a maximum value less than 108 μm, respectively, when the refractive index n of the transparent substrate.

2. Two-layer optical disk with a high recording density according to claim 1, characterized in that the first thickness of the substrate and a second thickness of the substrate is taken when the refractive index n of the transparent substrate, equal to 1.60.

3. Two-layer optical disk with a high recording density according to claim 1, characterized in that the distance between the first and second recording layers is in the range of 19±5 microns.

4. Two-layer optical disk with a high recording density according to claim 1, characterized in that the first thickness of the substrate and a second thickness of the substrate is selected from the condition that the refractive index n of the transparent substrate is in the range of 1.45-1.70 to.

5. Two-layer optical disk with a high recording density according to claim 4, characterized in that the first thickness of the substrate and a second thickness of the substrate, respectively 79,5±5 μm and 98,5±5 μm when the refractive index n of the transparent substrate, equal to 1.60.

6. Apparatus for writing to optical media or play the fight with optical media, containing optical head for recording data to optical media or play with him, while optical media includes two recording layer, the first recording layer has a minimum thickness of more than 70 μm, and the second recording layer has a maximum thickness of less than 108 μm, respectively, from the surface of the transparent substrate, on which light falls, when the refractive index n of the transparent substrate, a controller for controlling the sensor to record data on the first or second layer of the optical recording medium or reproducing data from it.

7. The apparatus according to claim 6, characterized in that the first thickness of the substrate from the surface of the transparent substrate, on which light falls before the first recording layer has a minimum value of more than 70 μm and the second thickness of the substrate from the surface of the transparent substrate, on which light falls to the second recording layer has a maximum value less than 108 microns.

8. The apparatus according to claim 6, characterized in that the first thickness of the substrate and a second thickness of the substrate is taken when the refractive index n of the transparent substrate, equal to 1.60.

9. Two-layer optical disk with a high recording density, containing the first recording layer and second recording layer located on one side of the Central plane dividing the disk in half in thickness, near the surface, on which light falls, while p is pout the thickness of the substrate from the surface, on which light falls before the first recording layer has a minimum value over 68,5 μm, the second thickness of the substrate from a surface on which light falls to the second recording layer has a maximum value less 110,5 μm, and the refractive index is in the range of 1.45-1.70 to.

10. Two-layer optical disk with a high recording density according to claim 9, characterized in that the first thickness of the substrate from the surface of the transparent substrate, on which light falls before the first recording layer has a minimum value over 68,5 μm when the refractive index n of the transparent substrate, is equal to 1.45.

11. Two-layer optical disk with a high recording density according to claim 9, wherein the second thickness of the substrate from the surface of the transparent substrate, on which light falls to the second recording layer has a maximum value less 110,5 μm when the refractive index n of the transparent substrate, is equal to 1.70.

12. Two-layer optical disk with a high recording density according to claim 9, characterized in that the distance between the first and second recording layers is in the range of 19±5 microns.

13. Two-layer optical disk with a high recording density according to item 12, wherein the first thickness of the substrate and a second thickness of the substrate are, respectively, 79,5±5 μm and 98,5±5 μm when the refractive index n of the transparent substrate, RA is Mr. 1,60.

14. Apparatus for writing to optical media or playback of optical media containing optical head for recording data to optical media or play with him, while optical media includes two recording layer, the first recording layer has a minimum thickness of more than 68,5 μm, and the second recording layer has a maximum thickness of less than 110,5 μm, respectively, from the surface of the transparent substrate, on which light falls, when the refractive index n of the transparent substrate, is equal to 1.45 is 1.70, and a controller to control the specified head to write data on the first or second layer of the optical recording medium or reproducing data with him.

15. The apparatus according to 14, characterized in that the first thickness of the substrate from the surface of the transparent substrate, on which light falls before the first recording layer has a minimum value of more than 70 μm and the second thickness of the substrate from the surface of the transparent substrate, on which light falls to the second recording layer has a maximum value less than 108 μm when the refractive index of 1.60 transparent substrate.

16. Two-layer optical disk with a high recording density, containing the first recording layer and second recording layer located on one side of the Central plane dividing the disk in half in thickness, near the surface, which decreases with the em while the first and second recording layers are in the range 68,5-110,5 μm from the surface of the transparent substrate, on which light falls, when the refractive index n of the transparent substrate, is equal to 1.45-1.70 to.

17. Two-layer optical disk with a high recording density according to item 16, wherein the first and second thickness of the substrate from the surface of the transparent substrate, on which light falls, respectively, to first and second recording layers are in the range 68,5-106,5 μm when the refractive index n equal to 1.45.

18. Two-layer optical disk with a high recording density by 17, characterized in that the first and second thickness of the substrate from the surface of the transparent substrate, on which light falls, respectively, to first and second recording layers are in the range 70,0-108,0 μm when the refractive index n equal to 1.60.

19. Two-layer optical disk with a high recording density by 17, characterized in that the first and second thickness of the substrate from the surface of the transparent substrate, on which light falls, respectively, to first and second recording layers are in the range of 71.4-110,5 μm when the refractive index n equal to 1.70.

20. Two-layer optical disk with a high recording density, containing the first recording layer and second recording layer located on one side of the Central plane dividing discopolis thickness, near the surface, on which light falls, while the first and second recording layers are in the range 70,0-108,0 μm from the surface of the transparent substrate, on which light falls, when the refractive index n of the transparent substrate, equal to 1.60.

21. Two-layer optical disk with a high recording density according to claim 20, characterized in that the first thickness of the substrate and a second thickness of the substrate are, respectively, 79,5±5 μm and 98,5±5 microns.

22. Apparatus for writing to optical media or playback of optical media containing optical head for recording data to optical media or play with him, while optical media includes two layers of recording the first recording layer and second recording layer, above the first recording layer and second recording layer are in the range 68,5-110,5 μm from the surface of the transparent substrate, on which light falls, when the refractive index n of the transparent substrate in the range of 1.45-1.70 to, and a controller to control the specified head to write data on the first or second recording layer of the optical medium or reproducing data from it.

23. The apparatus according to item 22, wherein the first thickness of the substrate from the surface of the transparent substrate, on which light falls before the first recording layer has a minimum value of more than 70 μm, and W heaven the thickness of the substrate from the surface of the transparent substrate, on which light falls to the second recording layer, has a maximum value less than 108 μm when the refractive index n of the transparent substrate, equal to 1.60.

24. Two-layer optical disk with a high recording density, containing the first recording layer and second recording layer located on one side of the Central plane dividing the disk in half in thickness, near the surface of the disc, and the first thickness of the substrate from the surface of the transparent substrate, on which light falls before the first recording layer corresponds to a value obtained by subtracting half the distance between the first and second recording layers of the thickness of the substrate from the surface of the transparent substrate, on which light falls to the recording layer in a single-layer optical disk with a high recording density, and the second thickness of the substrate from the surface of the transparent substrate on which light falls, to the second recording layer corresponds to a value obtained by adding half of the distance between the first and second recording layers to the thickness of the substrate from the surface of the transparent substrate, on which light falls to the recording layer in a single-layer optical disk with a high recording density.

25. Two-layer optical disk with a high recording density at a point 24, characterized in that the thickness of the substrate from the surface of the transparent substrate, on which light falls to the HHS records in a single-layer optical disk with a high recording density is 0.1 mm

26. Two-layer optical disk with a high recording density on p. 25, characterized in that the distance between the first and second recording layers is 0.02 mm

27. Two-layer optical disk with a high recording density on p. 25, characterized in that the first and second thickness of the substrate are, respectively, 0.09 mm and 0.11 mm



 

Same patents:

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: 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 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: technologies for manufacturing optical disks for storing information, in particular, development of fluorescent substance and method for manufacturing WORM-type optical disks based on it.

SUBSTANCE: fluorescent multilayer substance on basis of organic dyers with polymer linking component for optical data storage disks of type WORM with fluorescent reading, in accordance to first variant, has two-layered light-sensitive polymer composition inside a track, formed in transparent film made of refractory polymer. First layer has hard solution of fluorescent dyer. Second layer is a combined solution of light absorbent and fluorescence extinguisher. Polymer linking component belonging to first layer has substantially reduced melting temperature in comparison to polymer linking component belonging to second layer. In accordance to second variant, fluorescent multilayer substance is made sensitive to polarization of laser beam, enough for controlling processes of reading and recording information in a fluorescent WORM disk due to polarization of laser beam. Also provided is method for manufacturing one-layered optical disk of type WORM, basically including forming of a fluorescent layer in two stages. Firstly, lower semi-layer is formed, containing fluorescent dyer, and then - upper semi-layer, containing non-fluorescent dyer, or at the beginning lower semi-layer is formed, containing non-fluorescent dyer, and then - upper semi-layer, containing fluorescent dyer. Non-fluorescent dyer is selected in such a way, that its absorption area mainly coincides with spectral absorption area and/or fluorescence area of fluorescent dyer.

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: optical discs that can be manufactured with the use of one and the same process parameters.

SUBSTANCE: the optical disc for recording and/or reproduction has an area of an initial track, user's data area and an area of the final track. Each of the areas of the initial track, user's data and final track includes recording grooves and fields between the recording grooves produced in them. The recording grooves and the fields between the recording grooves include curves produced at least on one side of the recording grooves and fields between the recording grooves. The curves in the area of the initial track, in the area of the user's data and in the area of the final track are modulated by means of various methods of modulation.

EFFECT: enhanced reliability of signal recording and reproduction.

64 cl, 18 dwg

FIELD: optical data carriers.

SUBSTANCE: device has tracks, each of which is comprises multiple recesses, formed on basis of first data, meant for recording, and areas between recesses. Multiple recesses are displaced from track center on basis of second data, at the same time recesses cross central position of track with given periodicity. First data may be recorded analogically to compact disk data. Second data may be separated from signal of track tracking error. Second data may be used for copy protection in relation to first data, while amount of first data, which can be recorded on carrier, does not decrease when recording second data, and as a result of recesses displacement range being set within limits of preset value in range, wherein no track tracking displacement occurs, first data can be played back by existing players to provide for compatibility of playback.

EFFECT: higher efficiency.

8 cl, 12 dwg

FIELD: optical data carriers.

SUBSTANCE: device has cation dye or mixture of cation dyes with optical characteristics, changed by means of recording beam, an at least one substance with functions of damper and phenol or substituted phenol with one hydroxide group or more, while it additionally contains phenol or substituted phenol in form of phenolate ion, forming a portion of anions for dye cations, as a stabilizer. Data carrier can contain anionic metal-organic thyolene complex as damper, which forms other portion of anions for dye cations.

EFFECT: higher stability, higher durability, lower costs.

5 cl, 1 tbl, 3 ex

FIELD: data carriers.

SUBSTANCE: in optical data carrier, including track, including multiple recesses, formed on basis of first data being subject to recording, and platforms, formed between adjacent recesses, these recesses are recorded with deformation on basis of second data. First and second data are synthesized and played for realization of sound playback with broad frequency range. Also, first data are recorded with possible playback by means of common disc player. Playback of first data is controlled by second data for protection of recorded data.

EFFECT: higher efficiency.

6 cl, 44 dwg

FIELD: optical data carriers.

SUBSTANCE: optical data carrier has at least two layers, each of which is a substrate with recording film, on which optically discernible code relief is formed with information elements readable via laser radiation, which contain elements with optical limiting property. Method for manufacture of optical multilayer data carrier includes manufacture of at least two layers, each of which has optically discernible code relief with laser radiation readable information elements, which are formed of substance, having property of optical limiting. Method for multilayer optical recording of data, in which information is recorded by forming and moving pulses of laser radiation flow along surface of recording film in formed tracks, filled with substance, having optical limiting property, or components for synthesis of substance, having property of optical limiting. Method for reading from optical multilayer data carrier, including forming of laser radiation flow, its focusing at read layer with optically discernible code relief with information elements, containing substance, having property of optical limiting, modulation of light signal reflected from code relief by frequency and amplitude.

EFFECT: higher efficiency.

4 cl, 3 dwg

The invention relates to a memory means containing at least one set of data in memory

FIELD: optical data carriers.

SUBSTANCE: optical data carrier has at least two layers, each of which is a substrate with recording film, on which optically discernible code relief is formed with information elements readable via laser radiation, which contain elements with optical limiting property. Method for manufacture of optical multilayer data carrier includes manufacture of at least two layers, each of which has optically discernible code relief with laser radiation readable information elements, which are formed of substance, having property of optical limiting. Method for multilayer optical recording of data, in which information is recorded by forming and moving pulses of laser radiation flow along surface of recording film in formed tracks, filled with substance, having optical limiting property, or components for synthesis of substance, having property of optical limiting. Method for reading from optical multilayer data carrier, including forming of laser radiation flow, its focusing at read layer with optically discernible code relief with information elements, containing substance, having property of optical limiting, modulation of light signal reflected from code relief by frequency and amplitude.

EFFECT: higher efficiency.

4 cl, 3 dwg

FIELD: data carriers.

SUBSTANCE: in optical data carrier, including track, including multiple recesses, formed on basis of first data being subject to recording, and platforms, formed between adjacent recesses, these recesses are recorded with deformation on basis of second data. First and second data are synthesized and played for realization of sound playback with broad frequency range. Also, first data are recorded with possible playback by means of common disc player. Playback of first data is controlled by second data for protection of recorded data.

EFFECT: higher efficiency.

6 cl, 44 dwg

FIELD: optical data carriers.

SUBSTANCE: device has cation dye or mixture of cation dyes with optical characteristics, changed by means of recording beam, an at least one substance with functions of damper and phenol or substituted phenol with one hydroxide group or more, while it additionally contains phenol or substituted phenol in form of phenolate ion, forming a portion of anions for dye cations, as a stabilizer. Data carrier can contain anionic metal-organic thyolene complex as damper, which forms other portion of anions for dye cations.

EFFECT: higher stability, higher durability, lower costs.

5 cl, 1 tbl, 3 ex

FIELD: optical data carriers.

SUBSTANCE: device has tracks, each of which is comprises multiple recesses, formed on basis of first data, meant for recording, and areas between recesses. Multiple recesses are displaced from track center on basis of second data, at the same time recesses cross central position of track with given periodicity. First data may be recorded analogically to compact disk data. Second data may be separated from signal of track tracking error. Second data may be used for copy protection in relation to first data, while amount of first data, which can be recorded on carrier, does not decrease when recording second data, and as a result of recesses displacement range being set within limits of preset value in range, wherein no track tracking displacement occurs, first data can be played back by existing players to provide for compatibility of playback.

EFFECT: higher efficiency.

8 cl, 12 dwg

FIELD: optical discs that can be manufactured with the use of one and the same process parameters.

SUBSTANCE: the optical disc for recording and/or reproduction has an area of an initial track, user's data area and an area of the final track. Each of the areas of the initial track, user's data and final track includes recording grooves and fields between the recording grooves produced in them. The recording grooves and the fields between the recording grooves include curves produced at least on one side of the recording grooves and fields between the recording grooves. The curves in the area of the initial track, in the area of the user's data and in the area of the final track are modulated by means of various methods of modulation.

EFFECT: enhanced reliability of signal recording and reproduction.

64 cl, 18 dwg

FIELD: technologies for manufacturing optical disks for storing information, in particular, development of fluorescent substance and method for manufacturing WORM-type optical disks based on it.

SUBSTANCE: fluorescent multilayer substance on basis of organic dyers with polymer linking component for optical data storage disks of type WORM with fluorescent reading, in accordance to first variant, has two-layered light-sensitive polymer composition inside a track, formed in transparent film made of refractory polymer. First layer has hard solution of fluorescent dyer. Second layer is a combined solution of light absorbent and fluorescence extinguisher. Polymer linking component belonging to first layer has substantially reduced melting temperature in comparison to polymer linking component belonging to second layer. In accordance to second variant, fluorescent multilayer substance is made sensitive to polarization of laser beam, enough for controlling processes of reading and recording information in a fluorescent WORM disk due to polarization of laser beam. Also provided is method for manufacturing one-layered optical disk of type WORM, basically including forming of a fluorescent layer in two stages. Firstly, lower semi-layer is formed, containing fluorescent dyer, and then - upper semi-layer, containing non-fluorescent dyer, or at the beginning lower semi-layer is formed, containing non-fluorescent dyer, and then - upper semi-layer, containing fluorescent dyer. Non-fluorescent dyer is selected in such a way, that its absorption area mainly coincides with spectral absorption area and/or fluorescence area of fluorescent dyer.

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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