Optical recording media

 

The optical recording medium is parallel tracks for recording user information in the form of a combination of optically detectable marks, when this track is supplied with the control information. The tracks are grouped in pairs of adjacent tracks. Control information in both tracks of the pair are identical, and the control information in the tracks of different pairs are different. The technical result - the reduction of the impact of cross-distortion on the adjacent track. 2 C. and 7 C.p. f-crystals, 5 Il.

The present invention relates to an optical recording medium containing a recording layer having essentially parallel tracks for recording user information in the form of a combination of optically detectable marks, and tracks contain control information.

The invention also relates to a device for scanning such recording media.

When recording user data on a recording medium by scanning of the spot of radiation is usually required to know the position of the spot of radiation on the recording medium. As on a blank recordable recording media no user information, it can be determined by reading the management informacijama grooves or embossed pits (microglobuline) in the recording medium. The control information may also contain information about the record such as the capacity of the write or erase, which can be given depending on the wavelength of the spot of radiation and/or writing speed.

The track is usually a line on the recording medium, to be followed by the scanning device and which has a length of order of the characteristic size of the recording media. Track on a rectangular recording medium has a length essentially equal to the length or width of the recording media. The track on the disk recording medium is a revolution of 360° continuous spiral line or circle line on the disk.

The track may be a number of placemarks for some lines. The track can also be a groove and/or the flat part between the grooves. Groove is a recess in the flat part of the recording layer, and the bottom of this recess can find closer or farther from the recording media, on which light falls. User information can be recorded on the flat parts or grooves. Printed pittas can be on the flat parts or grooves.

From U.S. patent No. 5023856 known recording media described in the introductory part, m the direction of the length of the groove. Such fluctuation of the groove is control information in the form of an address indicating the position on the recording medium. The disadvantage of this known modulation schemes is that when you reduce the track pitch increase crosstalk control information between adjacent tracks.

The present invention is the creation of the recording media, having a smaller cross-distortion control information between adjacent tracks.

This problem is solved due to the fact that according to the invention tracks on the recording medium are grouped in pairs of adjacent tracks, and control information in both tracks of the pair are identical, and in the paths of different pairs are different. When scanning the track on the recording medium for reading out the management information of the scanned track will be affected by crosstalk only one adjacent track, i.e. the track that contains other control information. Crosstalk the other adjacent track, with identical control information, preferably along its entire length, is unlikely to have or even to improve the reading control information track being scanned at the moment. Preferably, mensano, to at most 10% of the tracks on the recording media contained identical information.

The reduction in cross-distortion increases as the read out signal, which can be obtained from the management data on the recording medium. This allows to reduce the number of ancillary data detection and error correction on the recording medium. The invention also allows to reduce the gap between tracks, which increases the capacity of the memory for user data on the recording media.

Tracks of the recording media preferably have an oscillating longitudinal grooves, and the wobble grooves encoded control information. This allows you to divide the read user information and control information.

Oscillation preferably represents a transverse offset of the center line of the groove. This allows you to select user information from the so-called Central aperture signal, and control information from the so-called out-of-phase signal. Mating tracks according to the invention reduces crosstalk adjacent tracks on an anti-phase signal.

Fluctuations in both tracks of the pair preferably by nagovoriti modulation of the groove of the adjacent track.

Control information on the merits of each track preferably contains a combination of markers, which allows to determine the position of the spot of radiation on the track. Together with antiphase oscillation of the grooves marker can be used to determine which of the two paths of the pair is scanned at the moment.

Another object of the invention is a device for scanning optical recording media according to the invention. The device includes an optical system for scanning tracks of a beam of radiation, a detector for detecting the beam of radiation coming from the recording media, the first scheme to fetch user information from the output signal of the detector and a second circuit for sampling control information from the output signal of the detector and differs in that it contains a third scheme for the identification of currently being scanned tracks of the pair of control information. Since the control information in the two tracks of the pair are identical, the definition of the address of the control information is insufficient to identify currently being scanned tracks. In the proposed device, in accordance with the invention, to identify the correct paths of the pair of tracks, iSolo with the ability to identify tracks with variations of the track, phase which is suitable for identification purposes, or from a comparison of the control information stored in the track currently being scanned and in an adjoining track.

Further objectives, advantages and essential features of the invention are explained specific description of preferred examples of its embodiments with reference to the accompanying drawings, in which

Fig.1 and 1b depict a top view and a cross section of one example of implementation of the proposed recording media,

Fig.2A and 2b depict in an enlarged scale of part four adjacent tracks on the recording medium,

Fig.3 depicts the four tracks on another example of the recording media and

Fig.4 depicts a scanning device according to the invention.

In Fig.1 shows an example of the disk medium 1 recording according to the invention, and Fig.1A shows its top view, and Fig.1b is a small part of the cross-section in the section along the line b-b. Media: 1 record contains a sequence of tracks, each of which forms a turn of 360° spiral lines, eight of which are represented in the figure. The track is formed, for example, pre-formed groove 4, or ledge 5, or a combination of grooves and protrusions. Track El 1 record contains a recording layer 6, which is deposited on a transparent substrate 7, and is covered with a protective coating 8. The tracks are scanned by a beam of radiation, which is included in the recording medium through the substrate 7. The recording layer is made of a sensitive radiation material, which under the action of the corresponding radiation is optically detectable change. This layer may be, for example, a thin layer of material, such as tellurium or dye that changes the reflection when heated by the beam of radiation. Alternative this layer may consist of a magneto-optical or modifies a phase of a material, which when heated changes, respectively, the direction of magnetization or crystalline structure. Examples of changing the phase of the material may be such compounds containing tellurium as AgInSbTe or GeSbTe. When scanning tracks of a beam of radiation, the intensity of which is modulated in accordance with recorded user information, information is formed by the combination of optically detectable marks representing the information. On the write once recording medium layer 6 may be reflective, for example, made of such metal as aluminum or silver. User information such wear the century

The gap between the grooves in the radial direction of the recording medium shown in Fig.1A and 1b, is 0.74 μm, and the width of the flat portion 5 is approximately equal to the width of the grooves 4. The depth of the grooves is 50 nm. This recording medium is suitable for scanning a beam of radiation having a wavelength of 635 to 650 nm.

In Fig.2A and 2b are depicted in an enlarged scale of the horizontal projection of the two parts of the four adjacent tracks on the recording medium shown in Fig.1. The disk recording medium in this embodiment is divided into 16 segments, so that each track is divided into 16 consecutive segments with equal angular factor. Each segment of the track is divided into 16 sequences. In Fig.2A shows the first sequence of four adjacent tracks 10, 11, 12 and 13, forming a pair of 10, 11 and the pair 12, 13. In Fig.2b shows a layout of each of the second to sixteenth sequences of tracks 10, 11, 12 and 13. Each sequence contains four serial bit element 14, 15, 16, 17.

The groove tracks are marked in bold wavy line, and the area between two adjacent lines is the flat part between the grooves. For greater clarity, the width of the flat parts in Fig.2A and 2b shows p is to be placed, which is directed essentially along the center line of the groove. The Central line of the grooves has a radial oscillation deviation of 20-30 nm between the peaks. The depth of the grooves in this embodiment is about 50 nm. Bit element contains four of the oscillation period by 360°.

The track segment contains 16 sequences, each of the four bit elements, which in General is 64 bit element in the segment. The first bit element 22 segment contains the bit synchronization. Each of the 63 subsequent bit elements represents some logical value of a bit of data. The information bits of data encoded in the phase of the wobble groove. The wobble grooves of the bit element 14 represents a logical "1" for all four tracks 10, 11, 12 and 13. The wobble grooves of the bit element 16 represents a logical "0" for all four tracks. The sequence of 63 values in bit elements is control information such as the number of layer in the multilayer recording medium, the track number, the segment number and the data error correction. The wobble of the groove 10 and the oscillation of the grooves 11 contains identical control information over the entire length of the track. The same applies to fluctuations in the AC is the complete opposite in the same way.

Each track contains at least one combination of markers in the form of so-called clock marks 23, i.e. relatively fast modulation of the groove at the beginning of the sequence. Clock mark in the even track 10 is changed from the zero deviation minimum deviation, then to the maximum variation and back to zero deviation. Under the deviation refers to the distance from the Central line of the groove to the Central line of the flat part between the two tracks of the pair. Clock label in odd-numbered tracks 11 is changed from the zero deviation minimum deviation, then to the maximum variation and back to zero deviation. Clock labels can be used for synchronization purposes. The polarity of the clock marks can be used to determine whether the scanned track is even or odd track.

In one specific example of the recording media each bit element contains predefined position, which may have Pete. These predetermined positions are on the flat parts between the pair of tracks and shows circles 18. A predetermined position, containing pit, shown empty circle 19 and in advance opredeleniya only on the flat part 10' between tracks 10 and 11 and the flat part 12' between tracks 12 and 13, what is the nature of this special variants of realization of the recording media. The depth of the pit is essentially equal to the depth of the grooves, i.e., 50 nm in this embodiment. The width of the pit may be less than the width of the flat part in the position of Pete. However, this width may be equal to the width of the flat part, to thereby form the connection between the two grooves on both sides of the flat part. These terms are grouped in doublets 21 of the two adjacent positions. Predetermined position in the doublet in the illustrated embodiment, are in the position of 90°±10° and 270°±10° of the second period fluctuations in the bit element.

The phase fluctuations of the groove in the special example of executing the recording media such that the deviation of the grooves has a maximum value at a predetermined position 20, not containing Pete, and the minimum value in a predetermined position 19 containing the pit. In the variant shown in Fig.2, it refers to the grooves on both sides of predetermined positions, i.e., the pair of grooves. Therefore, oscillation of even-numbered grooves 10, 12 is out of phase with the oscillation of odd grooves 11, 13. The fluctuation in this embodiment, no phase jumps in the bit elements containing data bits.Oia depends on logical values, presents the bit element. This allows the scanning device to read the information stored in the bit elements, not only of the educated patami modulation of the beam of radiation from the recording media, but also from the modulation formed by phase fluctuations. When a beam of radiation follows the groove 10, the information stored in pitch on the flat part 10', you can choose from so-called out-of-phase signal. The same information can be obtained during the scanning of the groove 11. The scanning device may determine scans whether it is even groove 11 or odd groove 10, the phase of the clock marks 23 or the vibration phase of the grooves in the first segment 22. The information stored in pitch on the flat part, the same for the two tracks on both sides of the flat part.

The bit elements in the above-described embodiments, the recording media have the same angular factor on the recording medium. Alternative recording media can be divided into several radial zones to the bit elements in the area had equal angular factor and the bit elements of the inner tracks of all areas was essentially equal to the linear length. The border zone is preferably located between the pairs of tracks. The area must contain at IU the hedgehogs. The combination of the bit element may contain more or less full of sinusoids instead of four sine waves shown in Fig.2A and 2b. The average deviation of each combination or number combinations, preferably zero, to eliminate the shifts in the radial tracking beam of radiation. This combination may contain parts with zero deviation, to avoid sharp transitions in the deviation.

Instead of sinusoidal hand, you can use other combinations, for example triangular or combination combination with synchroforce. Control information can also be encoded in the frequency modulation of the oscillations of the groove.

In Fig.3 shows four adjacent track another example of the recording media according to the invention. Tracks 25, 26, 27, 28 can be grooves, separated by flat portions, or flat parts, separated by grooves. The track is divided into consecutive sectors 29, one of which is shown on the drawing for each track. At the beginning of each sector is the header 30, containing a number of embossed pits representing control information. Part of the 31 tracks in the sector, following the header is designed to record user information. Header disorder. The control information contained in the ID sector and VFO field, identical in all sectors. The control information in the address 33 sector, representing the address of a sector that is identical for the two adjacent sectors in the tracks 25 and 26, as well as for two adjacent sectors in the tracks 27 and 28. Addresses in the tracks 25 and 26 are different from the addresses in the tracks 27 and 28. These addresses can be ordinal numbers increase by one for each pair of tracks. Alternative address may be a serial number even or odd tracks of each pair.

In Fig.4 shows a device for scanning the recording media shown in Fig.1. This device has an optical system 41 for the optical scanning of the tracks on the recording medium. The optical system 41 includes a source 42 of the radiation, for example a semiconductor laser. The source 42 emits radiation beam 43 radiation that is reflected by the beam splitter 44 and is reduced by the lens 45 in the spot 46 radiation on the tracks of the information layer of the carrier 40 entries. Radiation reflected from the recording medium, is directed through lens 45 and the beam splitter 44 to the detector 47. The detector is a split detector with the separating line between the two halves get half the total signal, commonly referred to as the Central aperture signal. The Central aperture signal represents user information recorded in the tracks, and is output as the signal Si. The second electronic circuit 49 generates from the two halves of the differential signal, usually referred to as out-of-phase signal. Antiphase signal is control information and surveyform recorded in the tracks, and is output as the signal Sp. The low-frequency component of the signal Spis surveyform, indicating the position of the spot 46 radiation relative to the center line of the scanned track. The signal Spused as input for servicemy 50, possibly after lowpass filter, which transmits surveyform, but blocks the control information. Sarvotham controls the position of the spot of radiation in the direction perpendicular to the track by means of the position control optical system 41 and/or the position of the lens 45 in the optical system.

The signal Spalso served in the CPU 51 of the signal, which selects the control information from the signal Sp. The signal control information output from the CPU 51 of the signals fed to microprocessor the treatment on the carrier 40 entries. During read, erase or write the microprocessor may compare the current position with the desired position and to determine the parameters for the transition of the optical system in a desired position. Parameters for transition are served in serwotka 48.

A third electronic circuit 53 selects the clock marks 23 of the signal Spand determines the phase of the clock marks. The signal representing the phase of the clock label is fed to the microprocessor 52. If, for example, spot 46 radiation should scan path 10, as shown in Fig.2A, this spot will be placed in the correct radial position, and a scanning device reads the control information from the track in order to determine the address of the sector to verify correct positioning. The device will read the same address during the scanning of the track 10 or tracks 11. The output of circuit 53 is used to distinguish between these two tracks, as the clock marks 10 and 11 have the opposite phase. Therefore, the combination of addresses and phase of the clock marks obtained from the control signal, can be used to identify tracks on the recording medium. Alternatively, to identify the paths used phase bits 22 sinkhronizatsiya this information. If the information is identical, the two scanned tracks belong to the same pair of tracks, if information are different, these two tracks belong to two neighboring pairs.

Information signal Siserved in the microprocessor, allowing him to choose from a signal, for example, reference information, which can be used to control the position of the spot of radiation. The information signal is outputted as the output signal 54 of the microprocessor 52.

When recording user data on a recording medium having pre-recorded servodirectie containing information about the position, subject to entry of the user information is supplied to the microprocessor 52 to the signal 55. The scanning device reads the position information from servatories. The microprocessor 52 synchronizes the recorded information with the position information and generates a control signal which is fed to the block 56 of the control source. Unit 56 controls source controls the optical power of the beam of radiation emitted by the source 42 radiation, thereby controlling the formation of marks on the carrier 40 entries. The synchronization may include the introduction of a fixed connection between the clock combinations in Upravljalnik signal.

Claims

1. Optical recording medium containing a recording layer having essentially parallel tracks for recording user information in the form of a combination of optically detectable label, with tracks supplied with control information, characterized in that the tracks are grouped in pairs of adjacent tracks, while the control information in both tracks of the pair are identical, and the control information in the tracks of different pairs are different.

2. The optical recording medium under item 1, characterized in that the track is equipped with an oscillating longitudinal grooves, while the control information is encoded in the fluctuations of the grooves.

3. The optical recording medium under item 2, characterized in that the oscillation is a transverse offset of the center line of the groove.

4. The optical recording medium under item 3, characterized in that the oscillations of the two track pairs are in antiphase.

5. The optical recording medium under item 1, characterized in that the control information, in essence, each track contains a combination of markers.

6. The optical recording medium under item 1, characterized in that the control information contains address information.

7. Device for the scan and for recording user information in the form of a combination of optically detectable marks, with tracks supplied with control information and grouped in pairs of adjacent tracks, the control information in both tracks of the pair are identical, and the control information in the tracks of different pairs are different, the device contains an optical system for scanning tracks of a beam of radiation, a detector for detecting the beam of radiation coming from the recording media, the first scheme to fetch user information from the output signal of the detector and a second circuit for sampling control information from the output signal of the detector, characterized in that the device contains a third scheme for the identification of currently being scanned tracks of the pair of control information.

8. The device according to p. 7, characterized in that the control information, in essence, each track contains a combination of markers, the third circuit configured to detect a combination of markers and to identify the scanned track from the combination of markers and from the address information contained in the control information.

9. The device according to p. 7, wherein the third circuit is configured to identify the scanned tracks from the address information contained in the managing informatively track.

 

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EFFECT: higher efficiency.

5 cl, 16 dwg

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