Optical disk and the methods of recording and playback your own information from an optical disc

 

The invention relates to the field of optical recording. Disclosed multilayer optical disk, on which his own information is recorded in the allocation information in one of the recording layers in the form of a pattern of crystalline and amorphous marks. Revealed recordings, under which private information recorded on one of the multiple layers of entry in the region of the selected information by heating with a laser beam, the amorphous recording layer above the temperature of crystallization and cooling of the recording layer to the crystallization temperature or below to form pattern of crystalline and amorphous marks. Revealed how to play their own data stored in one of the recording layers of the multilayer optical disc according to which irradiate a pattern of crystalline and amorphous marks, which contains private information, detects the reflected signal is filtered through a high pass filter and reproduce their own information. The technical result is to write your own information in the field of the selected information without damage to the drive can write your own information simultaneously with the initialization of the disk, the possibility of le=" page-break-before:always;">

The technical field to which the invention relates

The present invention relates to the optical drive and own ways of recording information on an optical disk and reproduce their own information from the optical disk and, in particular, to the optical disk, writable, in which private information is recorded by phase transitions, and to methods of recording information on an optical disk and reproduce their own information from the optical disk.

Prior art

Optical discs, i.e., the recording media, providing for the recording or reproduction of information by irradiation with light, divided into disks, read-only (ROM), allowing write-once, read (R), allow random access (RAM), allowing overwrite (RW), etc. depending on ways of recording and playback. Optical disks are classified into single-layer discs and dual layer discs, depending on the number of layers of information recording.

Single-layer discs, whether unilateral or bilateral, contain only one information layer, and the reproduction of information from them at the expense of otroki, whether it is unilateral or bilateral, contain two layers, each of which contains information layer: the first layer contains a translucent layer and the second layer includes a reflective layer. The reproduction of information of the first layer is performed by reflection of light from the translucent layer and the reproduction of information of the second layer is performed by reflection of light from the reflecting layer after its passage through the translucent layer.

Optical disks are classified into one-way drives and two drives in accordance with the structure of the information layer on the substrate. One-sided discs contain information layer only on one side of the substrate, whereas bilateral discs contain information layers on both sides of the substrate. Accordingly, two sided disc have the same recording capacity as the two-sided disk. One - and two-sided discs can be produced in the form of a single-layer or dual-layer discs described above.

In addition, optical discs are divided into compact discs (CD), digital versatile disks (DVD), DVD next generation, etc. in accordance with the recording capacity: 650 MB CD, 4.7 GB for DVD and over for next-generation DVDs.

the initial diameter of 120 mm, but they differ in the thickness of the substrate: 1.2 mm for CD, 0.6 mm for DVD and about 0.1 mm for DVD next generation. CD uses a laser beam with a wavelength of 780 nm and an objective lens with a numerical aperture (CHA) of 0.4, and for DVD uses a laser beam with a wavelength of 650 nm and an objective lens with a CHA of 0.6. For DVD next generation uses a blue laser beam and the objective lens with CHA 0,85.

The General physical structure of such an optical disc is divided, in the direction from the center of the disc to clamp the disk, the area of the selected information (ZVI), the zero track, the data area and the destination area.

The area of the clamping disk is a circular region in the center of the disk to which is applied the clamping force from the clamping site. The data area contains a custom area, back area, and the area management information. User data is recorded in the data area. Zero track and the final area is located on the inner and outer sides of the zone data, consisting of sectors, respectively.

The area where the generated codes ZVI, is called a field ZVI or ZVI. Codes ZVI for recording information on optical discs, for example, sequence number, date of manufacture, etc., are recorded in Saiki. In General ZVI is located between the landing zone of the disk and the zero track and takes about 1 mm in the radial direction. In DVD-R/RW or CD-R/RW, area calibration power (SCM) and zone program memory (FOD) located between the ZVI and the zero track. ZVI for DVD-R/RW or CD-R/RW has a length in the radial direction about 0.8 mm

In most optical disks codes ZVI recorded in the relevant ZVI in the form of a barcode by partial burning layer recording.

In Fig.1 shows a diagram illustrating the methods of recording and playback codes ZVI traditional single-layer optical disc disclosed in U.S. patent No. 6208736. As shown in Fig.1, codes ZVI write to the traditional optical disc (1) in the form of a barcode, burning out the laser beam 21 part reflecting layer 13 formed on the substrate 11. To generate the barcode label, the beam of a pulsed laser, for example, YAG laser garnet (YAG), focus on the reflection layer 13 through a focusing lens (not shown) for burning the reflecting layer 13, thereby forming an absorbent section 10. In Fig.1 position 15 denotes an adhesive layer, position 17 denotes a protective layer, and the position 19 denotes a printed layer on which printing is 10, read signal (2). Since the non-reflective section 10 has zero reflectivity, shape signal corresponding to the non-reflective section 10 has the form of a segment of a straight line, below the second level slice. The reflectivity of the area surrounding an absorbent section 10 varies in a sinusoidal manner and has an average level equal to the first level of the slice.

According Fig.1 signal (3) obtained by cutting the signal (2), expresses the signal-to-read markings. The signal read labeling in General expresses accommodation address, number of personnel added, the number of clock signals read, etc., In this case, the signal (3) is the physical location of a specific address. Signal (4) represents the clock signal reading obtained from a signal read by marking synchronization.

In Fig.2 shows a diagram illustrating the methods of recording and playback codes ZVI on the traditional two-layer optical disk. According Fig.2 traditional two-layer optical disk (1) codes ZVI record in the form of a barcode, burning out the laser beam 21 plots reflecting layers 13A and 13b formed on the first and second substrates 11a and 11b, respectively is 0b and the remaining reflective areas. In Fig.2 position 15 denotes an adhesive layer, and the position 17 denotes a protective layer.

According Fig.2 in the traditional two-layer optical disc (1) signal (2) is reproduced from the first layer, which contains a reflective layer 13A and the first substrate 11a. Signal (3) obtained by cutting the signal (2) represents the signal-to-read markings. Signal (4) represents the clock signal reading obtained from a signal read marking signal (3) by synchronization.

According Fig.2 in the traditional two-layer optical disc (1) signal (5) is reproduced from the second layer, which contains a reflective layer 13b and the second substrate 11b. The signal (6) to read the marks obtained by cutting signal (5). Signal (7) represents the clock signal reading obtained from the signal (5) read marking by synchronization.

In Fig.3A shows the labels bar code formed in the annular area ZVI traditional optical disc. The signal used to write data “01000” (3) in Fig.3B, has the form (2), shown in Fig.3V. Marks 31A and 31b of the bar code labeled (1) in Fig.3B, formed by signal (2). The signal reproduced from marks 31A and 31b of the bar code has the form (4), is shown in Fig.3V. Selecting nescac is installed “01000” (6), it is shown in Fig.3B, which is identical to the recorded data (3).

In conventional optical disks codes ZVI record as labels barcode, burning a reflective layer of the disc with a beam of high intensity, for example, YAG laser, causing physical deformation of the reflecting layer. However, the application of this method of recording to a thinner optical disk is connected with certain difficulties.

In particular, application for account codes ZVI on DVD next generation, having a thickness of about 0.1 mm, the same method is used for the conventional optical disk, leads to the fact that the energy of the beam damages the protective layer, which does not allow to form the desired pattern of labels barcode. In the case of two-layer optical disk, which contains a dielectric layer with a high heat absorption, optical disk damaged due to the strong absorption of heat due to high-energy laser beam, which does not allow to form the desired pattern of marks.

In addition, codes ZVI can be recorded on the optical disk, writable through phase transitions. In this case, after the initialization process is necessary to make a separate recording process code ZVI, for cigoutlet time to process.

The invention

To solve the above problems, a first object of the present invention is to provide an optical disc on which private information is recorded by phase transitions.

The second objective of the present invention is to provide a method of recording their own (substantial) information in a short time using existing devices optical reader, do not result in damage due to the energy of the laser beam.

The third objective of the present invention is to provide a method of play of their own (substantial) information from an optical disc using existing devices optical reader, which can be used to play private information from any layer recording to dual-layer optical disk is writable.

To solve the first problem, the present invention provides an optical disk on which private information recorded in the form of a figure formed by crystalline and amorphous marks.

To solve the first problem, the present invention also provides a multilayer optical disc, on which their own (substantial) informacnim labels. Preferably, the crystalline and amorphous marks were in the form of labels, bar code, passing in the radial direction, forming a circle around the center of the optical disc. Preferably the crystalline label has a higher reflectivity than the amorphous mark. Preferably the reflectivity of the crystalline label is not less than 20%.

For the second objective, the present invention provides a method of recording information on the optical disk, and the method comprises the stages at which heat the amorphous recording layer above the crystallization temperature by the irradiation of the beam corresponding to the signal subjected to photoelectric conversion, and slowly cool the heated recording layer to the crystallization temperature or below to form a pattern of crystalline and amorphous marks. In this case, the optical disk can contain multiple recording layers. Preferably the crystalline and amorphous marks are kind of labels bar code, passing in the radial direction, forming a circle around the center of the optical disc. Preferably the crystalline label has a higher reflectivity than the amorphous mark. Predpochtitel the present invention provides a way to playback their own information from the optical disk, the method comprises the steps, which is irradiated by the beam pattern formed by the crystalline and amorphous marks, in which the optical disk is recorded private information, receive the beam reflected from the pattern formed by the crystalline and amorphous marks, and subjected to the received beam photoelectric conversion detection signal, filtered detektirovanii signal through a high pass filter and reproduce their own (substantial) information from an optical disc of the filtered signal.

Preferably, the crystalline and amorphous marks were in the form of labels, bar code, passing in the radial direction, forming a circle around the center of the optical disc. Preferably the crystalline label has a higher reflectivity than the amorphous mark. Preferably the reflectivity of the crystalline label is not less than 20%.

According to the present invention, the pattern formed of the crystalline and amorphous marks, refers to the placement of the crystalline and amorphous marks in the area of self-information (SI) optical disc with recording capability, which is achieved by the formation of crystalline marks in the layer, is the od of the optical disk, allowing entry of data by phase transitions, it is necessary to understand the optical disk, the read signal generated by the difference in reflectivity between the crystalline and amorphous phases of the optical recording media.

If you need to record information in the data area of the optical disk producing irradiation with a laser beam of high power, short duration pulse to heat the recording layer to the melting temperature, and, thus, the transfer recording layer in the amorphous state. Then the heated recording layer is rapidly cooled, while maintaining the amorphous phase, resulting in the data area is formed of amorphous information label.

If you need to delete information from the data zones of the optical disk producing irradiation with a laser beam of low power with a large pulse width, heating the recording layer above the crystallization temperature, and then the recording layer is cooled slowly to education the right of the crystal lattice, resulting in erasing data from the zone data.

According to the present invention described above, the principle of recording and erasing information in the data area of an optical disk used for recording and erasing copstm, which are used in the data area.

According to the present invention record their own information and initializing an optical disc with recording capability, which provides for the recording of information by means of phase transitions can be carried out continuously, using existing devices optical reader. In addition, the present invention provides a laser diode, is widely used in devices, optical reader, which allows to solve the problem of damage to the disk with a laser beam of high intensity inherent in the traditional way of writing code ZVI. In particular, with regard to multi-layer optical disc, private information can be reproduced as long as the layer containing private information, is irradiated by the laser, regardless of which layer contains proprietary information.

Private information of the optical disk according to the present invention may be written in any code, including code ZVI.

Brief description of drawings

The above objectives and advantages of the present invention evident from the detailed description of preferred embodiments with reference to the accompanying drawings, in which euny optical disk and replay codes, ZVI, disclosed in U.S. patent No. 6208736;

Fig.2 is a diagram illustrating how to write codes ZVI on a double-layer optical disc and play codes ZVI, disclosed in U.S. patent No. 6208736;

Fig.3A is a view of an optical disc disclosed in U.S. patent No. 6208736, which formed the label barcode;

Fig.3B is a chart of signals of the read and write labels for barcode generated as codes ZVI on an optical disc according to U.S. patent No. 6208736;

Fig.4 is a view in section of an optical disc according to a preferred variant implementation of the present invention; and

Fig.5 is a block diagram illustrating the sequence of operations of a method of recording information on an optical disk according to a preferred variant implementation of the present invention; and

Fig.6 is an illustration of steps of a method of recording information on an optical disk according to a preferred variant implementation of the present invention; and

Fig.7A is a chart of the power level of the laser beam used for recording information on an optical disk that meets the present invention; and

Fig.7B is a chart of the temperature of the recording layer during recording of information the manual play their own information from the optical disk according to a preferred variant implementation of the present invention; and

Fig.9 is a view in section of an optical disc according to another preferred variant implementation of the present invention; and

Fig.10 is an illustration of signal reading obtained by the method of play of their own information that meets the present invention; and

Fig.11 is a diagram of a multilayer optical disk according to another variant implementation of the present invention; and

Fig.12A and 12B is a view in plan views in section respectively of an optical disk according to another preferred variant implementation of the present invention, in which the formed label barcode;

Fig.12C is an illustration of signal from the label, reproduced from labels bar code formed on the optical disk shown in Fig.12A and 12B;

Fig.13A is a view of an optical disc according to another preferred variant implementation of the present invention with labels barcode in the protective layer; and

Fig.13B and 13C is an illustration of the signals of the labels, read labels bar code formed on the optical disk shown in Fig.13A.

Detailed description of the invention

Below, with reference to the accompanying drawings, the detailed description of the preferred embodiments of the optical disk and JV>/p>In Fig.4 shows an optical disk that meets the preferred variant implementation of the present invention. In the optical disk shown in Fig.4, which is a digital versatile disc write-once (DVD-R) recording layers 33a and 33b formed on the first and second substrates 31A and 31b, respectively. A reflective layer 35A and a protective layer 37A is formed on the recording layer 33a, and a reflective layer 35b and the protective layer 37b is formed on the recording layer 33b. The first and second substrates 31A and 31b are connected to each other with the formation of symmetrical patterns by means of the adhesive layer 39.

According Fig.4 crystalline marks 30A and 30b formed in the recording layers 33a and 33b, respectively. As described above, in the basis of the present invention is the recording and playback your own (relevant) information on an optical disc according to the principle of phase transitions when the signal is read by differences in reflectivity between the crystalline and amorphous marks. Therefore, the optical disk according to the present invention, containing private information in the form of crystalline and amorphous marks, refers to optical discs that allow writing of data due to phase transitions. Currently the imaging principle of phase transitions.

Crystalline and amorphous marks in the recording layers 33a and 33b formed in a sequence of radial lines (barcode), which forms a circle around the center of the optical disk, between the area of the clamping disk and the calibration area capacity (SCM). In other optical disks such crystalline and amorphous marks are formed between the area of the clamping disk and the zero track. For any optical disc with recording capability, regardless of whether it is single or multiple, unilateral or bilateral optic disc, private information is recorded in the form of crystalline and amorphous marks by crystallization of the zone of self-information (SI) in an amorphous recording layer after the deposition of the amorphous layer of the recording.

Crystal marks 30A and 30b have a higher reflectivity than the amorphous marks. The reflectivity of the crystalline marks 30A and 30b is not less than 20%. In modern optical disks recording, where the recording data is carried out by means of phase transitions, as the main material used dual alloy or ternary alloy containing tellurium (Te) and selenium (Se), because of their ability to transition in amorphous costly laser beam and a large difference in reflectivity between the crystalline and amorphous phases.

The method of recording information by means of phase transitions, which meets the present invention provides for heating of the recording layer of the optical disk is higher than the temperature of crystallization by irradiation of the layer with the desired timing in accordance with the signal private information subjected to photoelectric conversion, and a slow cooling of the heated recording layer below the crystallization temperature for forming a crystal of the label, resulting in a pattern (template) of the crystalline and amorphous marks.

In Fig.5 shows a block diagram illustrating the preferred implementation of the method of recording information by means of phase transitions, which meets the present invention. According Fig.5 to record information on the optical disc, first irradiated SI recording layer with a laser beam (step 1). Then the recording layer is heated above the crystallization temperature (step 103). The heated recording layer is gradually cooled to the crystallization temperature or lower (step 105) to form a crystalline label on a given plot of ATP (step 107). Steps 101-107 repeat until you write your own information optionsfile labels.

Fig.6 illustrates a method of recording information, corresponding preferred variant implementation of the present invention. After fabrication of the source optical disc 70, first optical disk 70 form the recording layer so that the entire optical disk 70 was in the amorphous phase, as shown in stage (1) Fig.6. The optical disk 70 shown in stage (1) Fig.6 is amorphous, not entirely but partially because it contains a small amount of crystals. Then, as shown in stage (2) Fig.6, is irradiated with a laser beam SI layer 72 by using the recording device, optical reader (not shown) to initialize the optical disk 70.

Then the power of the laser beam is raised to the level of crystallization, as shown in Fig.7A, while the recording layer irradiated with the laser beam will not be heated to a temperature above the crystallization temperature and below the melting temperature, as shown in Fig.7V.

Then, the recording layer heated by the radiation beam, slowly cooled to the crystallization temperature or lower, reflecting the graph g1 in Fig.7V. If the recording layer to heat above the melting temperature and rapid cooling, which reflects the graph g2, the recording layer can Peralta in the area of the recording layer, subjected to the laser beam, is formed crystalline label, and, thus, private information is recorded in the form of a pattern of crystalline and amorphous marks, as shown in stage (3) Fig.6.

Phase transition in SI 72 recording layer is different from a phase transition in the data area. The temperature of the zone data to increase the melting temperature, whereas, according to a variant implementation of the method of recording information that meets the present invention, the temperature of the WAZ 72 increase above the crystallization temperature, which is below the melting temperature.

In other words, for recording information in the data area of the recording layer heated to the melting point, is cooled quickly to form a fully amorphous marks. Thus the neighboring area of the zone data, in which information is not recorded after heating to the melting point is cooled slowly, which leads to crystallization of the adjacent regions. On the contrary, to record their information in the form of a pattern of crystalline and amorphous marks, ATP 72 is irradiated with a laser beam and slowly cooled. The amorphous parts of the figure are plots of the original amorphous recording layer which are not exposed to irradiation and crystallizes is public information, meet the preferred variant implementation of the present invention. According to the method of play of one's own is irradiated with a laser beam ATP containing a pattern of crystalline and amorphous marks (step 111), detects the electrical signal converted from a light beam reflected from the ATP and received by a photodetector (step 113), filtered detektirovanii signal through a high pass filter (step 115) and reproduce their information from the filtered signal (step 117).

In a traditional optical disc reflectivity of a given parcel layer recording, which was physically removed to write code ZVI (zone of the selected information) in the form of a barcode, lower than in neighbouring areas. For this reason, in order to reproduce the signal extracted from ZVI, it is passed through a low pass filter. In contrast, for an optical disc with recording capability that meets the preferred version of the present invention, in which private information is recorded in the form of a pattern of crystalline and amorphous marks, the reflectivity of the crystalline marks higher than that of amorphous marks, therefore, to reproduce the signal extracted from kristallicheskogo of the invention shown in a DVD-RAM, on which is recorded private information. According Fig.9 DVD-RAM contains a protective layer 43A, the recording layer 45, a protective layer 43b, a reflective layer 47, the adhesive layer 49 and the protective layer and 43C, which are sequentially formed on the substrate 41. According to the above-described crystalline label 40A barcode is formed by irradiating a laser beam to the recording layer 45, which, after deposition is amorphous, while the laser power reaches a level of crystallization.

Since the reflectivity of the crystalline marks 40A is higher than that of amorphous marks 40b, the playback signal from the crystal label has a high logic level, and the playback signal from the amorphous marks 40b has a low logic level.

In Fig.10 shows a diagram illustrating how to play their own information that meets the present invention, and as private information of the recorded data “0010010”.

According to the schedule (1) in Fig.10 label bar code that appears in the first half of each period corresponds to “0”, and the label of the bar code that appears in the second half of each period corresponds to “1”. Graph (2) Fig.10 shows the power level of the laser used to record labels barcode codna the ability to label the barcode above, than the adjacent areas, where the labels barcode is not formed. As shown in the graph (4) Fig.10, the reproduced data “0010010”, is identical to the data recorded in as private information.

In Fig.11 shows the structure of the multilayer optical disc conforming to another preferred variant implementation of the present invention. According Fig.11 multilayer optical disc contains multiple layers of L0-Lnsequentially arranged on the substrate 51. In Fig.11 R0-Rnmean reflectivity values of the respective layers L0-Ln.

In Fig.12 shows a view in plan of a two-layer optical disc that contains only layers L0and L1shown on Fig.11, in which the label and the bar code formed on opposite sides of a disk by irradiating a laser beam through the objective lens with CHA 0,6 surface double-layer optical disc 51 with a thickness of 0.6 mm In Fig.12B shows a partial view in section of a double-layer optical disc shown in Fig.12A.

According Fig.12V dual-layer optical disk translucent layer 55, which plays the role of the recording layer, a reflective layer 57 and a protective layer 53b are consistently located on p is 9 focused on the recording layer, a translucent layer 55, via the tag 50 of the bar code.

In Fig.12C shows the signal from the label, reproduced way to play your own information that meets the present invention. In Fig.12C AND indicates the signal of radio frequency (RF) appearing in Channel 1, and denotes the error signal tracking. Even when focusing errors 0.6 mm corresponding to the thickness of the substrate (d), the signal from the label, reproduced with the surface of the substrate 53A, clearly visible in Channel 1.

In Fig.13A shows an optical disk in which a label bar code formed on the protective layer at a distance of 0.1 mm from the recording layer by irradiation with a laser beam through the objective lens with net assets of 0.85. In Fig.13B shows the signal from the label, detektirovanii by focusing the laser beam on the recording layer at a distance of 0.1 mm from the protective layer, which is formed label barcode. In Fig.13C shows the signal from the label, detektirovanii by focusing the laser beam on the protective layer containing the labels of the bar code. According Fig.13B and 13C of the shapes of the two signals are almost identical, even in the presence of focusing errors in 0.1 mm

The results obtained for the two-layer optical disk, show that, since the intermediate layer formed on formirovanii in layer L0to record your own information can be accurately reproduced by focusing a laser beam through the objective lens with CHA 0,65 on another layer L1.

According to a preferred variant of the method of play of their own information that meets the present invention, proprietary information will not necessarily be recorded in each recording layer of the multilayer optical disc. In particular, if the information is recorded in the label bar code in an arbitrary layer of the multilayer optical disk, information can be reproduced as the label bar code is irradiated, without focusing the laser beam. When focusing and tracking for recording data on a multilayer optical disk or reproducing data from it, if private information recorded in the layer L0private information can be reproduced at the same time as focusing is carried out in an arbitrary information layer through the layer of L0to read or play back the data from it.

In this case, the level of the playback signal from the information recorded in the form of a pattern of crystalline and amorphous marks, according to the present invention is inverted in respect to the about and described with particular references to the preferred options for its implementation, the above-described preferred embodiments of which are only illustrative and not intended to limit the scope of the invention. Therefore, experts in this field should understand that the private information of the optical disc can be written in the form of any labels in addition to labels barcode. The above private information can be conveyed by any code, including code ZVI. Therefore, because of the variety of embodiments of the present invention, the nature and scope of the invention should be determined by the attached claims and not the aforesaid preferred option implementation.

According to the above-described optical disk conforming to the present invention, has the advantage that due to the structure containing a pattern of crystalline and amorphous marks, namely, that private information can be recorded on an optical disk of any type that provides a record on the principle of phase transitions, including single-layer and multi-layer discs.

The advantage of the method of recording information on an optical disk by means of phase transitions, which meets the present invention is that the recording sobstvennosti initialization that eliminates the need for additional recording device and additional time.

Advantage of how to play their own information from the optical disk by means of phase transitions, corresponding to the present invention, is that private information can be reproduced by using an existing optical device playback. Furthermore, with respect to a multilayer optical disk when information is recorded in any of the multiple layers by means of phase transitions, according to the present invention is a private information can easily play due to the high reflectivity of the crystalline phase.

Claims

1. Multilayer optical disk, on which his own information recorded in the zone of the selected information in one of the multiple recording layers in the form of a figure formed by crystalline and amorphous marks, and crystalline label formed by heating the irradiating beam amorphous recording layer above the crystallization temperature, the pattern of crystalline and amorphous marks formed when slow cooled the tives such as those that crystalline and amorphous marks are kind of labels bar code, passing in the radial direction.

3. Multilayer optical disk according to p. 2, characterized in that the crystalline and amorphous marks are located on a circle around the center of the optical disk.

4. Multilayer optical disk under item 2 or 3, characterized in that the crystalline label has a higher reflectivity than the amorphous mark.

5. Multilayer optical disk according to p. 4, characterized in that the crystalline label has a reflectivity of at least 20%.

6. The way you write your own information of the disk in the region of the selected information in one of the multiple recording layers of the multilayer optical disk, comprising stages at which heat the amorphous recording layer above the crystallization temperature by irradiation beam, slowly cool the heated recording layer to the crystallization temperature or below to form a pattern of crystalline and amorphous marks.

7. The method according to p. 6, characterized in that the crystalline and amorphous marks are kind of labels bar code, passing in the radial direction.

8. The method according to p. 6, characterized in that the crystalline and amorphous marks are located on a circle Vokrug reflectivity, than amorphous mark.

10. The method according to p. 8 or 9, characterized in that the crystalline label has a reflectivity of at least 20%.

11. How to play private information disc from the area of the selected information in one of the multiple recording layers of the multilayer optical disk, comprising stages, which is irradiated by the beam pattern of crystalline and amorphous marks, which recorded its own information of a multilayer optical disc, take the beam reflected from the pattern of crystalline and amorphous marks, and subjected to the received beam photoelectric conversion detection signal, filtered detektirovanii signal from crystalline labels through a high pass filter and reproduce information from an optical disc of the filtered signal.

12. The method according to p. 11, characterized in that the crystalline and amorphous marks are kind of labels bar code, passing in the radial direction.

13. The method according to p. 11 or 12, characterized in that the crystalline and amorphous marks are located on a circle around the center of the optical disk.

14. The method according to p. 13, characterized in that the crystalline label has a higher reflectivity, h is the institutional capacity of not less than 20%.

 

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FIELD: optical discs.

SUBSTANCE: sector header on optical disc has first and second headers, recorded in a way to deflect from track middle in opposite directions, and have address areas, wherein address signals are recorded and synchronous signals areas for detecting address signals. Playback signal generator includes photo-detector, having radial couples of detecting elements. Playback signal includes total signals V1 or V2 of radial couples of detecting elements, total signal RF_sum of detecting elements, counter-phase signal RF_pp of detecting elements, from optical signal reflected from disc. Header area detector generates header area signal, containing header area from playback signal received from playback signal generator. Level detectors for first and second synchronous signals receive playback signal from playback signal generator and perform detection of value of first synchronous signal in first header and value of second synchronous signal in second header. Balance calculator calculates balance value of first and second synchronous signals. Determining of error of slant is performed in accordance to balance value.

EFFECT: higher efficiency.

2 cl, 15 dwg

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