RU2295164C2 - Disk data carrier, burning device and disk drive - Google Patents

Abstract

FIELD: optical data carriers.

SUBSTANCE: invention is related to optical disk, preformed on which is a spiral track with swaying in form of groove and/or area, along which recording of data is performed. Groove is made with swaying in form of series of predetermined modules of signal, each one of which consists of part of bit of frequency shift keying information, based on shape of signal received as a result of frequency shift keying modulation of information bit and part of single frequency, based on shape of signal of single frequency. In frequency shift keying modulation two varying frequencies are used, first one of which matches single frequency and second one is different from single frequency. These various frequencies are selected in a ratio so that each one of them composes even number of sways and odd number of sways in turns during a predetermined cycle.

EFFECT: accelerated synchronization and stable operation of disk drive.

3 cl, 27 dwg

Description

Technical field

The present invention relates generally to a disk recording medium, such as an optical disk, a slicing device for use in manufacturing a disk recording medium, and a disk drive for recording and / or reproducing data on and / or from the disk recording medium, and more specifically, to a disc recording medium containing a swing track formed thereon in the form of a pre-marked groove.

State of the art

To record data on an optical disk, which is a disk recording medium, a direction tool must be used to form the recording track. To this end, pre-marked grooves are formed on the optical disk in advance, and the groove or area having a trapezoidal cross-section between the pre-formed grooves is used as the recording track.

In order to be able to write data in a predetermined position on the recording track to this type of optical disc, address information must be recorded. In some cases, such address information is recorded on an optical disc using a track swing technique. At the same time, the recording track is preliminarily marked on the optical disk in the form of, for example, a pre-marked groove so that the side walls of the pre-marked groove are accordingly bent to record address data. At the same time, for recording information on an optical disc or reproducing from it, the address at which data should be recorded, or from which data is to be read, can be read using the swing information obtained in the form of backward light, and this data can be recorded in desired position or can be read from the desired position without the need for preliminary recording of data indicating the address, or similar information, in the form, for example, recesses (pits) on the recording track.

Thanks to the additional recording of the address information in the form of a track with a swing, there is no need to define a separate address area on the track and record the address in such an address area in the form of data recorded in the form, for example, of recesses. Therefore, the actual capacity of the optical disk used to record data can be increased by using the space occupied by the address area, which, therefore, is no longer necessary.

The absolute time (address) information provided in such a swing groove is called ATIP (absolute time in a pre-marked track) or ADIP (address in a pre-marked track).

Optical discs on which such a swing groove is formed include CD-R discs (writable CD), CD-RW (rewritable compact disc), DVD-R, CD-RW, DVD + RW (universal digital discs with various recording formats), etc. However, the methods for recording additional address information in the form of a groove swing are different for different types of optical discs.

In CD-R and CD-RW discs, a groove swing is generated in accordance with a signal generated using FM (FM) modulation (frequency modulation) of the address information.

The ATIP information recorded in the swing track generated on the CD-R / CD-RW discs is subjected to two-phase modulation before FM modulation, as shown in FIG. More specifically, two-phase modulation is performed in such a way that the ATIP data, such as address, or similar information, when performing two-phase modulation, change their state between the values “1” and “0” in each predetermined cycle, and the ratio between the average 1 "and" 0 "is 1: 1, and with FM modulation of the ATIP data, a swing signal with an average frequency of 22.05 kHz is generated.

The swing of the groove defining the recording track is carried out in accordance with such an FM modulation signal.

In a DVD-RW disc, which is a rewritable version of a DVD disc, recording in which is based on a phase change of a signal reflected from the notches, and in a DVD-R disc, which is a version of a recordable DVD disc, data on which is recorded based on the change in the organic dye, the rocking grooves G are marked during the pre-formatting of the disk, and the pre-formed recesses LPP are formed on the sites between the grooves G, as shown in FIG. 2.

In this case, the swing groove is used to control the rotation of the disc and generate the main recording clocks or to perform similar functions, and the notches previously formed on the platforms are used to determine the exact recording position in bits and to record various information about the disc, such as the pre-formed address, etc. In this case, portions of the address information are recorded as pre-formed LPP recesses at the sites, and not as a groove swing.

In DVD-RAM discs, which are a recordable version of a DVD disc, which is based on a change in signal phase. Information, such as an address, is recorded on a disk as a groove swing using phase modulation (PSK phase shift keying).

Figures 3A-3C show a groove swing structure in which phase modulation based information is recorded. As shown in figa-3C, eight swings are perceived as one ADIP module. Each of the swings has phase modulation for positive swings PW and negative swings NW, which are performed alternately in a predetermined order, so that the ADIP module represents the synchronization structure or data as "0" or "1".

It should be noted that the positive swing PW is the swing, the leading edge of which is directed towards the inner circumference of the disc, and the negative swing NW is the swing, the leading edge of which is directed toward the outer circumference of the disc.

3A shows a synchronization structure (ADIP synchronization module). In such a synchronization structure, the first four swings (WO to W3) are negative swings NW and the last four swings (W4 to W7) are positive swings PW.

FIG. 3B shows an ADIP data module that represents data “0”. In such an ADIP data module, the lead swing W0 is negative NW and is used as bit synchronization, followed by three swings from W1 to W3, which are positive swings of PW, and the last four swings include two swings W4 and W5 in the form of positive swings PW and two negative swings NW, swings W6 and W7. Such an ADIP data module represents data “0”.

3C shows an ADIP data module that represents data “1”. In this ADIP data module, the lead swing WO is a negative swing NW and is used as a bit synchronization, followed by three swings from W1 to W3, which are positive swings of PW, and the last four swings include two swings W6 and W7, which are negative swings NW, and two swings W6 and W7, which are positive swings PW. Such an ADIP data module represents data “1”.

These ADIP modules together represent one channel bit, and a predetermined number of such ADIP modules represent an address or similar information. However, the foregoing rocking techniques are not preferred for the following reasons:

Firstly, in the case when the groove swing is formed in accordance with the FM modulated data, as in CD-R and CD-RW discs, the swing cycle of the adjacent track leads to a change in the phase of the FM signal oscillations. Thus, when decreasing the step between tracks, it is impossible to ensure good reproduction of the address recorded in the form of ATIP data. In other words, the swings generated from the FM modulation data cannot be used while decreasing the track pitch to increase the recording density.

Further, in the case of recording pre-formed notches on the sites that is used in DVD-R and DVD-RW discs, pre-formed notches on the sites can cause crosstalk in the read-out RF signal, which leads to data errors during manufacturing (cutting ) of the original disk, it is necessary to simultaneously form grooves and pre-formed recesses on the platforms (the manufacture of the original disk must be made using two laser beams). Such a technology is relatively difficult to implement.

In addition, in the case where the groove is swinging in accordance with the PSK data, as in the case of a DVD-RW disc, the radio frequency component of the phase change point of the PSK modulation signal may crosstalk with the RF signal being read, resulting in a critical error.

It should also be noted that since the FMN phase shift point has a component with an extremely high frequency, the fundamental frequency band of the swing signal processing system will be wider.

SUMMARY OF THE INVENTION

Accordingly, the present invention seeks to overcome the above-described disadvantages of the prior art by developing a new and improved disc recording medium in which a groove is swinged using a swing method that is suitable for discs with a high recording capacity and provides improved recording-reading characteristics of a medium a recording device, a slicing device for producing a disk recording medium, and controlling a disk compatible with the disk medium pisi.

The aforementioned goal can be achieved by creating a disk recording medium on which a spiral track with a swing made in a groove is formed in advance, or on a site in which data is recorded in which a track swing is a sequence of predefined signal modules, each of which consists of parts of the FSK bit (FSK) of information corresponding to the waveform obtained by modulating the FSK (frequency manipulation) bit of information, and parts of a single frequency corresponding to the waveform but with one frequency.

For the above disc recording medium, two different frequencies are used for modulating the FMN. One of the frequencies coincides with a single frequency, while the second frequency differs from a single frequency. These frequencies are in such a ratio with each other that each of them contains an even number of oscillations and an odd number of oscillations alternately in a predetermined cycle. For example, the value of the second frequency is 1.5 or 1 / 1.5 of the value of a single frequency.

Regarding the bit of the FMN information, the period of 2 oscillations of a single frequency corresponds to one bit of the channel used as an information bit.

The duration of the bit part of the FMN information is selected as a multiple of an integer number of periods of a single frequency. In a predetermined module, the duration of a part with a single frequency is more than about 10 times the length of the period of a part of the FSK information bit.

According to the present invention, an integer multiple of predetermined modules corresponds to the length of time in the data recording unit to be recorded on the track.

The clock frequency of a data channel for recording onto a track is an integer multiple of a single frequency. The value of the single frequency used is selected between the servo control band when tracking the track and the frequency band of the read signal.

A part of the FSK information bit is generated on the basis of the waveform obtained during FSK modulation of information bits in the address data. When modulating the FSK, two different frequencies are used for part of the FSK bit of information. These frequencies follow one after another continuously in phase at the switching point from one frequency to another.

In accordance with the present invention, the modulation of the FSK is modulation MNMS (MSK) (manipulation with minimal shift). In terms of the FSK bit of information obtained by modulating the ISM information bit, 4 periods of frequency oscillations used as a single frequency correspond to one channel bit used as an information bit. In this case, a part of the FSM information bit obtained by modulating the ISM information bit includes two different frequencies, one of which coincides with a single frequency and the second is x times higher than a single frequency. A period of 4 oscillations includes a period of four oscillations of the same frequency and a period of x oscillations of the second frequency and three oscillations of the same frequency. For example, x = 1.5.

In addition, the above objectives can be achieved using a slicing device, comprising, in accordance with the present invention:

- means for generating a sequence of predetermined signal modules, each of which consists of a signal part obtained on the basis of modulation of the FSK information bit, and a signal part with a single frequency,

means for generating a control signal based on a signal from the signal generating means,

laser source means

means for deviating the laser light obtained by means of the laser source based on the control signal from the means for generating the control signal, and

means for cutting the substrate by emitting laser light onto the disk substrate through laser light deflecting means for forming a rocking track on the disk substrate including a sequence of predetermined modules, each of which consists of a part of the FMN bit of information based on the form of vibrations obtained by modulation FMN is a bit of information, and a part of a single frequency, based on a single frequency waveform.

In addition, the above objective can be achieved by using a disc drive for recording or reproducing data on or from the above disc recording medium in accordance with the present invention, and such a device includes, in accordance with the present invention:

head means for emitting laser light onto a track for generating a signal of backward light,

means for extracting the swing signal when the track is swinging from the signal of the light coming back; and

swing information decoding means for demodulating the FSK swing signal for decoding information represented by the information bit.

More specifically, the swing information decoding means includes a clock frequency reproducing module for generating using PLL (phase locked loop) a clock frequency of the swing signal reproduction based on a portion of the single frequency, a FMK demodulator for performing demodulation of the FMN swing signal corresponding part of the FSK bit of the swing signal information to obtain demodulated data, and a decoder for decoding the required information a mission consisting of a bit of information from the demodulation data coming from the FMN demodulator.

The FMN demodulator includes a correlation detection circuit designed to perform FMN demodulation by determining the correlation between the swing signal and the delayed signal obtained when the swing signal is delayed by the swing playback clock.

The FMN demodulator also includes a frequency detection circuit designed to perform FMN demodulation by detecting a series of rise or fall fronts of the swing signal present in one period of the swing reproduction clock.

In the case where the FMN demodulator contains the above correlation detection circuit and a frequency detection circuit, the decoder decodes the required information using both demodulation data obtained as a result of demodulation using the correlation detection circuit and data obtained as a result of demodulation using the frequency detection circuit . In particular, the decoder decodes the required information from the result of the logical product of the demodulated data coming from the correlation detection circuit and from the frequency detection circuit when the FAPS is included in the clock frequency reproducing unit, and decodes the required information from the result of the logical summation of the demodulated data from the detection circuit correlation and data coming from the frequency detection circuit when the FAPS is stable in the playback unit t such as are for the frequency.

The decoder includes a strobe generator for generating a strobe signal for the FAPS when operating in the clock reproduction unit based on decoding the synchronization information as one of the required information, and the FAPS operates on the basis of the strobe signal to ensure the operation of the FAPS based solely on the part corresponding to single frequency swing signal.

The disk drive, in accordance with the present invention, further includes a servo control spindle for servo control of the spindle of the disk drive when using the swing frequency, and means for generating a coding clock synchronous with the swing frequency, and which should be used to encode data intended for recording.

The swing information decoder also includes an MNMS demodulator designed to demodulate the MNMS signal with modulation of the MNMS corresponding to a portion of the FSK bit of the swing signal information to generate demodulation data. The MNMS demodulator demodulates the MNMS signal in modules over 4 frequency periods, which is a single frequency, to obtain a modulation signal.

The rocking method adopted in the present invention is carried out in such a way that the rocking track is formed as a sequence of predetermined modules, each of which includes a part of the FMN bit of information and a part of the single frequency based on the waveform of the single frequency. That is, since the modulation of the FMN (MNMS) is fragmentary, the effect of crosstalk on the swing will be negligible. In addition, since there are no recesses previously formed on the site at the site, it does not contain gaps, which excludes the effect of site gaps on data intended for recording. Since notches are not formed at the site, the recording of the source disc can be done with a single beam. In addition, the swing does not contain high-frequency components, as in the case of application of FMN.

These objectives, as well as other objectives, features and advantages of the present invention will be better understood by reading the following detailed description of the best method for implementing the present invention when considered in conjunction with the accompanying drawings.

Brief Description of the Drawings

Figure 1 shows a graphical explanation of the principle of swing based on FM modulation.

Figure 2 - schematically the formation of pre-formed at the site of the recesses.

Figures 3A, 3B and 3C show a representation of information by swinging a phase modulated groove.

FIG. 4A is a plan view of a first embodiment of an optical disk according to the present invention on which rocking grooves are formed, and FIG. 4B is a perspective view of a portion of an optical disk.

5 illustrates a swing module of an optical disc in accordance with the present invention.

FIG. 6 illustrates a portion of the FSK bit of the swing information of an optical disc groove in accordance with the present invention.

7 illustrates an ECC optical disc unit in accordance with the present invention.

On Fig explains the structure of RUB (block recording module).

Figures 9A and 9B illustrate an address structure of an optical disc in accordance with the present invention.

Figures 10A and 10B illustrate an address structure of an optical disk in accordance with the present invention.

11 is a block diagram of a slicing device used to produce an optical disc in accordance with the present invention.

12 is a control block diagram of a disc in accordance with the present invention.

13 is a block diagram of a swing circuit included in a disc drive in accordance with the present invention.

FIG. 14 is a block diagram of a correlation detection circuit included in a disc drive in accordance with the present invention.

Figures 15A-15G show waveforms indicating time instants in which a correlation detection circuit is included.

FIG. 16 is a block diagram of a frequency detection circuit included in a disc drive in accordance with the present invention.

In figures 17A-17E shows the waveforms, with the designation of time points, which include a frequency detection circuit.

Figures 18A-18F illustrate the MHMS swing flow of a second embodiment of an optical disc in accordance with the present invention.

On figa-19C explains the structure of the swing bits according to the second variant embodiment of the optical disc, in accordance with the present invention.

Figures 20A and 20B illustrate an address block for RUB of a second embodiment of an optical disc in accordance with the present invention.

Figures 21A-21C illustrate a portion of a synchronization signal according to a second embodiment of an optical disc in accordance with the present invention.

Figures 22A-22E illustrate the structure of a synchronization bit according to a second embodiment of an optical disc in accordance with the present invention.

Figures 23A and 23B illustrate a portion of the data of a second embodiment of an optical disc in accordance with the present invention.

Figures 24A-24C illustrate the structure of an ADIP bit of a second embodiment of an optical disc in accordance with the present invention.

25 is a block diagram of an MNMS demodulator used for a second embodiment of an optical disc in accordance with the present invention.

FIGS. 26A and 26B illustrate the demodulation of the MNMS using the waveform of the signal observed when the length (L) of the swing detection window is L = 4.

FIGS. 27A and 27B illustrate the demodulation of the MNMS using the waveform of the signal observed when the length (L) of the swing detection window is L = 2.

The best way of carrying out the invention

The present invention will be described below when considering its use in an optical disk, a slicing device for use in manufacturing an optical disk, and in a disk drive for recording and reproducing data on and from an optical disk.

A description of the present invention will be given in the following order:

First Embodiment

1-1 Physical characteristics of the optical disc

1-2 Swing Method

1-3 slicing device

1-4 Disc Drive

The second embodiment:

2-1 Swing Method

2-2 Demodulation

The first embodiment:

1-1 Physical characteristics of the optical disc

The physical characteristics of the optical disc in accordance with the present invention and the swing track formed on the optical disc will be described below.

An optical disc in accordance with the present invention is included, for example, in the category of discs called "DVR (for data recording and video recording)" discs. It uses a new swing method for DVR discs. Table 1 shows typical parameters of a first embodiment of an optical disc in accordance with the present invention.

Table 1 Laser light wavelength 405 nm Numerical Aperture (NA) 0.85 Disc diameter 120 mm Disc thickness 1.2 mm Diameter Information Location from 44 to 117 mm Step density 0.30 μm Channel Bit Length 0.086 μm Information Data Bit Length 0.13 μm Capacity for user data 22.46 GB Average user data rate 35 Mbps Recording method Phase change / groove entry

A first embodiment of an optical disc in accordance with the present invention is an embodiment in which a method of recording phase-shifted data onto it is used. The disk has a diameter of 120 mm and a thickness of 1.2 mm. Such diameter and thickness of the optical disc, in accordance with the present invention, are similar to these parameters for CDs (compact disc) and DVDs (universal digital disc).

Like conventional disks of this type, the first embodiment of an optical disk contains an input region, a program region and an output region marked from it, counting from its inner circle. The information area, including these areas, in diameter covers an area in the range from 44 mm to 117 mm.

The wavelength of the laser light used to record or reproduce data is 405 nm. The laser in accordance with the present invention is a so-called blue laser. To focus the laser light emitted to the optical disc onto the optical disc signal recording layer, an objective lens having a numerical aperture (NA) of 0.85 is used.

The pitch of the recording track is 0.30 μm, the channel bit length is 0.086 μm, and the information data bit length is 0.13 μm. The optical disk has a capacity of 22.46 GB for recording user data. User data can be transmitted at an average speed of 35 Mbps.

Data is recorded using a prior art method of recording in a groove. Namely, the grooves are preformed as recording tracks on an optical disc, and data is recorded in the grooves.

FIG. 4A shows, in a plan view, a first embodiment of an optical disc in accordance with the present invention. The optical disc is indicated by reference number 100. In such an optical disk 100, embossed notches EP are pre-formatted on the innermost side of the circle, and a groove GV is formed in the range following the embossed notches EP towards the outer circumference, as shown in the drawing. The groove GV is formed in a spiral from the inner circle towards the outer circumference of the optical disk. It should be noted that in another embodiment, the groove GV may be formed in concentric circles. Swings of such a GV groove represent physical addresses.

4B is a schematic perspective view of a portion of an optical disk. The optical disc is indicated by reference number 1 here. As shown in the drawing, the optical disk 1 comprises a groove GV formed thereon. The side wall of the groove GV is rocked, which corresponds to address information or similar information, that is, corresponds to a signal generated based on the address or similar information. Site L is located between two adjacent grooves GV. Data is written into the GV groove as described above. That is, the GV groove serves as a recording track. It should be noted that, as an alternative, data can be recorded on site L, which in this case is used as a recording track, or both in groove GV and site L.

The present invention is directed to an optical disk having a rocking property of a groove, which will be described below in more detail. Briefly, due to the use of the groove swing, in accordance with the signal generated by the FMN modulation of the address or similar information, the optical disk in accordance with the present invention, respectively, can be used as a disk with a high density and high capacity.

It should be noted that the data is written to or read from the optical disk 100 as it is rotated under the condition of PLC (CLV) (constant linear velocity). PLC rotation is also used when data is written into the GV groove. Therefore, the number of swings in the groove per revolution of the track will increase as the groove passes toward the outer circumference of the optical disc.

1-2 Swing Method

Next will be described in detail a method of swinging a groove.

5 shows the structure of a swing module used for recording on an optical disc in accordance with the present invention. The swing of the groove is carried out to form a sequence of swing modules, which are shown in Fig.5. As shown in the drawing, each swing module consists of a part of the FSK information bit and a part of a single frequency. The single frequency part includes only swings with a sweep frequency fw1. For this part, the grooves are rocked for a fixed cycle corresponding to the frequency fw1. In this part of the single frequency form, for example, a sequence of 65 swings at a frequency fw1. It should be noted that the single-frequency sweep fw1 is also called “monotonic sweep”. On the other hand, part of the FSK information bit includes swings obtained as a result of FSK modulation of ADIP information, which is performed using two different frequencies, the first of which is the same frequency as the frequency of monotonous sweep fw1, and the second is the frequency fw2, different from the frequency of monotonous swing. The duration of a part of the FSM information bit in time corresponds to the length of six monotonous swings.

A period of 65 monotone swings of a single frequency part is selected only as an example, and if a part of the FSK information bit has a period of six monotonous swings, as noted above, it should be noted that a part of a single frequency can have a period of, for example, 60 monotone swings. However, it is more effective to reduce the negative impact of crosstalk, as well as to provide a simpler and faster capture of the FAPS to reduce its negative impact so that part of the single frequency is essentially longer than part of the FMN bit of information. For example, the period of the single frequency part should preferably be more than 10 times longer in duration than the period of the part of the FSK information bit. Therefore, in the case where a part of the FMN information bit is formed so that it contains a period of six monotonous swings, a part of the single frequency must be set so that it has a period of more than 60 monotonous swings. This does not mean that the single frequency part cannot be set so that it has a period of less than 59 monotonous swings. In practice, however, the period of the single frequency part should be set appropriately, taking into account such requirements as permissible crosstalk ranges, FAPS capture time, etc.

One part of the FSK information bit, having a period of six monotonous swings, represents one information bit in the form of ADIP data. As shown in FIG. 5, an address or similar information in the form of ADIP data is represented using bits of information from ADIP modules from 0 to N in the form of parts of the FSK bit of information located discretely, alternately with parts of a single frequency.

Due to the structure of the ADIP data address, which will be described in more detail below, the monotonic wobble frequency fw1 is, for example, 478 or 957 kHz. On the other hand, the second frequency fw2 used to modulate the FSM can, for example, be 1.5 times higher than the frequency fw1. That is, the frequency fw2 is 717 or 1435.5 kHz. However, the frequencies fw1 and fw2 are not limited to the above values. For example, the frequency value fw2 may be 1 / 1.5 the value of the frequency fw1. In addition, the frequencies fw1 and fw2 should preferably be in such a relationship that the even and odd numbers of swings are performed at both frequencies for a predetermined cycle. In the case where the frequency fw2 is 1.5 times higher than the frequency fw1, as described above, the period of six swings at the frequency fw1 will correspond to the period of nine swings at the frequency fw2, which corresponds to the above relationship for the even and odd number of swings performed in a predefined cycle. Fulfillment of these requirements makes it easier to demodulate the FSK in the disk drive, which will be described in detail below.

The information bit, the represented part of the FSK information bit, consisting of swings obtained after modulation of the FSK ADIP information performed using two different frequencies fw1 and fw2, will be described below with reference to Fig.6. It should be noted that in the following description, the frequencies fw1 and fw2 are in a ratio of 1: 1.5.

In the part of the FMN bit of information having a period of six monotonic swings, the period of two monotonic swings is used as one bit of the channel. Therefore, in one part of the FSK information bit (one ADIP module), three channel bits together form one information bit. The FMN is modulated so that the frequency fw1 represents the channel bit “0”, while the frequency fw2 represents the channel bit “1”. That is, for a period of two monotonous swings at a frequency fw1, two swings with a frequency fw1 represent "0", while three swings at a frequency fw1 represent "1". Three channel bits in one part of the FSK information bit represent information bits such as cluster synchronization bits, secondary synchronization bits, data “0” and data “1”. Three channel bits representing bits "1", "1" and "1", respectively, constitute cluster synchronization. In this case, nine swings at a frequency fw2 are included in series in a period of six monotonous swings, as shown in FIG. 6. Three channel bits equal to "1", "1" and "0", respectively, represent secondary synchronization. In this case, six monotonous swings at a frequency fw2 are included sequentially in a period of four monotonous swings, and a period of two monotonous swings following a period of four monotonic swings include two monotonic swings with a frequency fw1. Three channel bits representing "1", "0" and "0", respectively, constitute data "0". In this case, a sequence of three swings at a frequency fw2 is included in a period of two monotone swings, and a period of four monotonous swings following a period of 2 swings includes four swings at a frequency fw1. Three channel bits equal to "1", "0" and "1", respectively, represent data "1". In this case, three swings with a frequency fw2 are included in series in the first period of two monotone swings, the period of two monotonous swings following the first period includes two swings at a frequency fw1, and a sequence of three swings at a frequency fw2 is included in the last period of two monotonous swings.

As indicated above, a portion of the FSK information bit, that is, one ADIP module, as shown in FIG. 5, represents one information bit, and such bits of ADIP information are collected to generate address information. The address information representing one address on the disk contains, for example, 98 bits. In this case, 98 ADIP modules, partially presented as a swing groove, are assembled to generate address information. This process will be further described below with reference to figures 9 and 10.

In the present embodiment, an integer multiple of the swing modules, each of which is a predetermined swing module, corresponds to the time duration of the data recording module to be recorded on the track. The data writing module is called RUB (writing module block). One RUB includes an integer number of addresses. Next, examples of addresses in one RUB and two addresses in one RUB, respectively, will be described.

As indicated above, the address is information included in 98 ADIP modules. In the case when one address is included in one RUB, the section of 98 swing modules corresponds to the section where the data is recorded as one RUB. In the case where two addresses are included in one RUB, the section of 196 swing modules corresponds to the section where the data is recorded as one RUB.

At the beginning, with reference to FIG. 7, the structure of the ECC (error correction code) block of the data intended for recording will be described to explain RUB as a data module for recording.

One ECC block is also called a “cluster”. It is a single block formed by adding an error correction code to the data intended for recording. As shown in FIG. 7, the ECC block consists of 495 rows of a 1932T recording frame (where T represents the data channel clock period). One ECC block is 64 kilobytes in size. The ECC block consists, for example, of data and parity codes, as shown in FIG.

The period "1932T" corresponds to 28 monotonous swings at a frequency fw1 (= 957 kHz) or 14 monotonous swings at a frequency fw1 (= 478 kHz). More specifically, 69 periods T of the channel clock frequency for data (with a frequency fw1 equal to 957 kHz), or 138 periods of T channel clock frequency for data (with a frequency fw1 equal to 478 kHz), correspond to one period of monotonous swing with a frequency: fw1. The channel clock frequency for the data is 66.033 kHz, which corresponds to 957 kHz x 69 or 478 kHz × 138. That is, the channel clock frequency for the data is an integer multiple of the monotonic sweep frequency, which means that one encoded clock cycle for recording data can be it is easily generated using the oscillation clock frequency reproduced by the FAPS from the monotonous oscillation of the groove made with oscillation.

Adding the input and output sequences to the ECC block shown in Fig. 7 results in RUB (block of the recording module), which is shown in Fig. 8. RUB consists of the GD protection and the PrA preamble, which are used as the 1932T input sequence at the beginning of the ECC block, and the postamble PoA and GD protection constituting the 1932T output sequence at the end of the ECC block, as shown in Fig. 8. Therefore, RUB is a block of 1932T x 497 rows, which is a module for recording data. Such RUB corresponds to one of the two sections of address information used in the form of ADIP information. Initially, an example of one address corresponding to one RUB will be described with reference to Figures 9A and 9B and Table 2. In the case where one address corresponds to one RUB, the frequency fw1 of monotonous sweep is 478 kHz. The period of one swing corresponds to 138T. In this case, since one recording frame from 1932T for RUB corresponds to a period of 14 swings, one RUB will correspond to a period of 14 × 497 (= 6958) monotonic swings, as shown in FIG. 9A. In the case when one address corresponds to one RUB, a period of 6958 monotonous swings is used as one address block (ADIP).

Since one address is formed from a block consisting of 98 bits, as described above, 98 swing modules can be laid out during a period of 6958 monotonic swings, as shown in Fig. 9B. One swing module will have a length corresponding to a period of 71 monotonous swings. That is, one swing module consists of a part of the FSK bit of information, the period of which is six monotonous swings included in the ADIP module, and 65 monotonous swings.

One bit of information, as shown in FIG. 6, is sampled from each of 98 ADIP modules to generate address information of 98 bits. The bits included in the address information are shown in Table 2.

table 2 Total 98 bit Description Primary sync 1 bit Cluster synchronization Auxiliary bits 9 bits Cluster address 24 bits (3 bytes) Auxiliary data 40 bits (5 bytes) ECC 24 bits (3 bytes)

One upper bit represents synchronization information. It corresponds to cluster synchronization. The next 9 bits are auxiliary bits of information. The next 24 bits (3 bytes) determine the value of the cluster address. The next 40 bits (5 bytes) are auxiliary information bits. The last 24 bits (3 bytes) form the ECC for the address information.

In the case when two addresses are included in one RUB, the address information of 98 bits is compiled, as shown in Fig. 10 and in Table 3.

Table 3 Total 98 bits Description Primary sync 1 bit 1/2 cluster synchronization Auxiliary bits 9 bit Half Cluster Address 24 bits (3 bytes) 2 addresses per cluster Auxiliary data 40 bits (5 bytes) ECC 24 bits (3 bytes)

In the above case, the frequency fw1 of monotonous wobble is 957 kHz. The period of one swing corresponds to 69T. In this case, since one 1932T recording frame for RUB corresponds to a period of 28 swings, one RUB will correspond to a period of 13916 (= 28 × 4917) monotonic swings, as shown in FIG. 10A. In the case when two addresses are included in one RUB, a period of 6958 monotonous swings, which are half the period of one RUB, will be one address block (ADIP). Since the address is formed from a 98-bit block, in this case, too, blocks of 98 swings will be included in a period of 6958 monotonic swings, which is half the period of one RUB. One swing module corresponds to a period of 71 monotonous swings, as shown in FIG. 10B.

Thus, a portion of the FSK information bit, including a period of six monotone swings, which are one ADIP module, and a period of 65 monotone swings, together forms one swing module, as shown in Figures 9A and 9B.

One information bit in each of the 98 ADIP modules is used to generate address information of 98 bits. The bits included in the address information are composed as shown in FIG. 10. One upper bit represents synchronization information. It corresponds to cluster synchronization for half the cluster. The next 9 bits are auxiliary bits of information. The next 24 bits (3 bytes) define the address value of half the cluster. The next 40 bits (5 bytes) are auxiliary bits of information. The last 24 bits (3 bytes) form the error correction code for the address information.

The rocking method used in the present invention has been described above. Essentially, the swing method in accordance with the present invention has the following properties.

To swing the track, a predetermined swing module is formed from a part of the FSK bit of information corresponding to the waveform of the signal obtained by modulating the FSK bit of information and a part of the single frequency corresponding to the waveform at the single frequency fw1, and such swing modules are continuously connected in series. That is, a part of the FSK bit of information containing the actual bit of information embedded in it will be part of the recording on the track made with the swing (groove). Recording a part of the FSM bit of information as a part of the recording on a swing track can significantly reduce the negative effect of crosstalk, even if a narrow pitch of the tracks is used.

Two different frequencies fw1 and fw2 are used to form a part of the FSK information bit in the FSK modulation. The frequency fw1 coincides with the frequency of the monotonous swing, and the frequency fw2 is selected, for example, 1.5 times higher than the frequency fw1, as described above. Thus, the frequencies fw1 and fw2 are chosen in such a relationship that each of them contains an even number of swings and an odd number of swings alternately in a predetermined cycle.

In terms of the FSK information bit, a period of 2 monotonous swings represents one bit of the channel used as an information bit. The period of a part of the FSK information bit corresponds to a period of six swings, namely, a period corresponding to an integer multiple of the period of monotonous swings. These properties make it easier to modulate the FMN.

In the swing module, the period length of the single frequency portion is selected to be greater than about 10 times the length of the bit part of the FSK information. Thus, a sufficiently long period of a single frequency part with respect to a part of the FSK bit of information simplifies the reduction of the negative effect of crosstalk.

In the relationship between the swing and the recorded data, an integer multiple of the predetermined modules corresponds to the length of time RUB, which is a module for recording data intended for recording on a track. One RUB includes an integer number of addresses, one or two, in the form of ADIP information. These properties result in a correspondence between the swing groove and the data intended for recording in the groove.

The value of the clock frequency of the data channel intended for recording in the track is an integer multiple of the value of a single frequency fw1 of the monotonic swing of the groove. Thus, the coding synchronization frequency for recording data can be easily generated by dividing the clock frequency of the swing generated based on the swing.

The frequency fw1 of monotonous sweep is 478 or 957 kHz, for example, as described above. This frequency is chosen so that it falls into the frequency range between the bandwidth of the servo control of the track tracking (about 10 kHz) and the bandwidth of the frequencies of the read signal (several MHz or more). This property allows you to separate and highlight the ADIP information represented by the swings, without the formation of any interference between the servo control signal and the read signal.

The above modulation of the FSM is modulation of the MNMS (manipulation with minimal shift), as one of the modulation methods of the FSM. In FMN modulation, the modulation index H is determined, and two frequencies f1 and f2 are used. Modulation Index H = | f1-f2 | / fb, where fb represents the transmission rate of the signal intended for modulation. The modulation index is usually 0.5 Н H 1 1.0. FMN with a modulation index H of 0.5 is called "MNMS".

In accordance with the present invention, two different frequencies fw1 and fw2 are phase-continuous with respect to each other at the switching point from one part of the FSK bit of information to another. Thus, a part of the FSK information bit will not contain a high-frequency component in the swing obtained using the FSM.

1-3 slicing device

Next, a slicing device for manufacturing discs on which a rocking path is formed will be described in detail.

The manufacturing or manufacturing process of a disc generally consists of the so-called manufacturing process of the original and the replication process. The manufacturing process of the original includes the production steps before forming a stamp intended for use in the replication process, and the replication process includes production steps in which the stamp is used for mass production of optical discs in the form of an exact copy of the stamp.

More specifically, in the manufacturing process of the original, a photoresist layer is applied to the polished glass substrate, the photoresist layer is exposed to a laser beam to form recesses and grooves in the photoresist layer (the so-called “cutting” process).

In this embodiment, the recesses are cut into a part of the photoresist layer corresponding to the region of the relief grooves on the side of the inner circumference of the disk, and the swing grooves are cut into the part corresponding to the groove area.

The data for the notches formed in the region of the raised notches is prepared in a process called “preparing the original disc”.

After slicing, the photoresist layer is subjected to a predetermined processing process, such as development, and the information is recorded on a metal surface using, for example, an electroforming method, to form a stamp necessary for replicating a disk.

The stamp is then used to transfer information to the surface of the substrate made of polymer resin using, for example, an injection molding process to form a reflective layer on the substrate of polymer resin, and then the product is finally processed using a process such as molding from the substrate required drive.

Consider now Fig. 11, which shows a block diagram of a slicing device in accordance with the present invention. As shown in the drawing, the slicing device comprises an optical system 70 in which a laser beam is emitted to the surface of the substrate 71 containing a photoresist layer formed thereon for cutting the photoresist layer, a drive system 80 for rotating the glass substrate 71, and a signal processor 60 designed to convert the input data into data intended for recording and controlling the optical system 70 and the system 80 of the drive.

The optical system 70 includes a laser source 72, which is a He-Cd laser, for example, an acousto-optical type (AOM) optical modulator 73, designed to modulate (turn on / off) the laser beam from the laser source 72, based on data intended for recording, an acoustic deflector 74 of an acousto-optical type (AOD), designed to deflect a laser beam coming from a laser source 12, based on a swing signal, a prism 75, designed to deflect the optical axis of the modulated a laser beam coming from the optical deflector 74, and an objective lens 76 for focusing to a point of a modulated laser beam reflected in the prism 75, and for emitting a converging laser beam onto a photoresist surface on a glass substrate 71.

The drive system 80 includes an engine 81 for rotating the glass substrate 71, a frequency FG generator 82 for generating FG pulses which are used to determine the rotation speed of the engine 81, and a translational movement engine 83 for translating the glass substrate 71 along its radius and a servo controller 84 for controlling the rotation speed of the engine 81 and the translational displacement motor 83, tracking the lens lens 76, etc.

The signal processor 60 includes a formatting circuit 61 for generating input data by adding an error correction code or a similar code to source data coming from, for example, a computer, as well as a logical operating circuit 62 for generating the data required for recording by predetermined processing regarding input coming from formatting circuit 61. The signal processor 60 also includes a data generator 63, a parallel / serial converter 64, and a sign converter 66 for generating a swing signal to form a swing of the groove. The signal processor 60 further comprises a synthesis circuit 65 for selecting one of the signals of the logical operating circuit 62 and the signal of the sign converter 66, and outputting it as one continuous signal, as well as a control circuit 68 for controlling the optical modulator 73 and the optical deflector 74 based on a signal from synthesis circuit 65. In addition, the signal processor 60 includes a clock generator 91 for supplying the GTI main clock pulses to the logic operating circuit 62, etc., and a system controller 67 for controlling the servo controller 84, the data generator 63, etc. d. based on the main GTI clock pulses coming from the clock generator 91. The main clock pulses of the GTI coming from the clock generator 91 are divided by N in the frequency divider 92 to receive the clock bits of the “bit Ck” bits. The clock bits of the “Ck bit” are divided by eight in the frequency divider 93 to receive the clock pulses of the “Ck byte” byte. The clock pulses of the "byte Ck" byte are fed to those circuits where they are required.

When slicing a photoresist layer on a glass substrate 71, the sevocontroller 84 of the cutting device, in accordance with the present invention, controls the engine 81 to rotate the glass substrate 71 at a constant linear speed, and the translational movement motor 83 is used to translate the rotating glass substrate 71 to form a spiral tracks with a predetermined track pitch.

At the same time, the laser beam at the output of the laser source 72 enters the optical modulator 73 and the optical deflector 74, where it is modulated based on the data intended for recording, and the laser beam so modulated is emitted through the lens 76 to the surface of the photoresist on the glass substrate 71. Thus thus, exposure of the photoresist is performed based on the data and in accordance with the groove.

To cut the area of the relief grooves located on the side of the inner circumference of the disk, input data containing an error correction code or a similar code added to them using the formatting chain 61, namely, data to be recorded in the area of the relief grooves, such as as control data, fed to the logical operating circuit 62, where the data intended for recording is generated. When synchronizing the cutting in the area of the relief grooves, the data intended for recording is supplied to the control circuit 68 through the synthesis circuit 65. The control circuit 68 controls the optical modulator 73 so that it is turned on when the bits are to be generated and off when the bits are not to be generated in accordance with the data being recorded.

When performing the above operations on the glass substrate 71 is formed of the exposed part corresponding to the relief grooves.

At the time of cutting the groove area, the system controller 67 controls the serial output of the data supplied from the data generator 63, and the corresponding part of the FMN bit information, and part of a single frequency. For example, data generator 63 generates a data sequence of "0" based on the clock pulses of the byte "Ck" during a period corresponding to a single frequency. In addition, during the period corresponding to the part of the FSK information bit, the data generator 63 generates the necessary data, respectively, for each of the ADIP modules, forming the above address block. Thus, the data generator 63 generates channel bit data corresponding to the cluster synchronization, secondary synchronization, data “0” and data “1” at a point in time corresponding to each period of the FSM. Of course, the data generator 63 generates the above data “0” or “1” in such a predetermined order that the data collected from the ADIP modules form a cluster address value and additional information. The output from the data generator 63 is formed in the form of a serial data stream corresponding to the clock pulses of the bit "bit Ck" in the parallel / serial converter 64, and are supplied to the sign converter 66. The sign converter 66 uses the so-called table search process to select a sine wave with a predetermined frequency, in accordance with the supplied data, and output it. In this regard, during the period corresponding to a single frequency, the sign converter 66 constantly outputs sinusoidal oscillations with a frequency fw1. In addition, during the period corresponding to the part of the FSK bit of information, the sign converter 66 outputs either oscillations with a frequency fw2 or one of the frequencies fw1 and fw2, as shown in FIG. 6, in accordance with the content of the bit part of the FSK information, namely, one of the sequences of the cluster synchronization, secondary synchronization, data “0” and data “1”.

The synthesis circuit 65 provides an output signal from the sign converter 66 to the control circuit 68, that is, a single frequency signal or an FSK signal at frequencies fw1 and fw2, which are used as a swing signal. The control circuit 68 controls the optical modulator 73 so that it is set to the on state to form a groove. In addition, the control circuit 68 controls the optical deflector 74 in accordance with the swing signal. Thus, the laser beam is swinging, namely, the part exposed in the form of a groove is recorded with the swing. Using the above operations, the exposed portion corresponding to the swing groove is formed on the glass substrate 71 in accordance with the desired format. After that, the glass substrate 71 is subjected to development, electroforming, etc. to obtain a stamp, and the stamp is used to manufacture the above discs.

1-4 Disc Drive

Next, a disc drive in accordance with the present invention for recording data on the above optical disc and for reproducing data recorded on the optical disc will be described. 12 shows a block diagram of a disc drive in accordance with the present invention. The disk drive is generally indicated by reference numeral 30. An optical disk 100 made in accordance with the above description is used as a recording medium with a disk drive 30.

To write data to the optical disk 100 or play them from it, the optical disk 100 is mounted on a rotation drive 7 and rotated using a constant-speed linear spindle (PLC) spindle motor 6. The rotating signal recording area on the optical disk 100 is scanned using laser light emitted by the optical head 1 to read data recorded on the track in the form of notches formed on the optical disk 100 and ADIP information recorded in the form of track swings. The notches recorded on the track formed as a rocking groove are the so-called phase-changing notches, and the notches formed in the relief notches on the inner circumference are the so-called relief notches.

In the optical head 1, a laser diode 4 is installed, used as a laser light source, a photodetector 5, designed to detect light coming back from the optical disk 100, an objective lens 2, for collecting and focusing the laser beam on the optical disk 100, and an optical system (not shown) designed to emit laser light onto the recording layer of the optical disk 100 through the lens 2 of the lens and directing the backward component of the laser light reflected from loy record. In addition, the optical head 1 includes a tracking detector 22 for tracking part of the output light of the laser diode 4. The laser diode 4 emits the so-called blue laser light with a wavelength of 405 nm. The numerical aperture (NA) of the optical disc is 0.85. The lens 2 of the lens is mounted on a biaxial mechanism 3 with the possibility of movement, both in the directions for tracking the track, and in the directions for focusing.

The entire optical head 1 is moved using the mechanism 8 of translational movement in the radial direction with respect to the optical disk 100.

The laser diode 4 mounted in the optical head 1 is controlled by a control signal from the laser control circuit 18 to emit laser light.

The information contained in the backward light reflected from the optical disk 100 is detected by a photo detector 5, where it is converted into an electrical signal corresponding to the intensity of the reflected light, and fed into a matrix circuit 9 including a current-voltage conversion circuit, a calculation / amplification matrix circuit, and etc. to generate the necessary signals by processing in the matrix of the output currents received from a plurality of photosensitive photodetector units 5. The necessary signals include a high-frequency signal (read data signal) corresponding to the read data, the focus center error signal FE and the track tracking error signal TE designed to implement servo control etc. In addition, the necessary signals include a groove swing signal, namely, a two-phase P / P signal, which is used as a groove swing detection signal.

The read data signal coming from the output of the matrix circuit 9 is supplied to the binary conversion circuit 11, while the focus error signal FE and the error tracking signal TE are supplied to the servo control circuit 14 (servo processor), and the push-pull signal P / P is fed to the FMN demodulator 24.

The push-pull signal P / P, in the form of a groove swing signal, from the matrix circuit 9 is processed in the swing circuit consisting of the FSK demodulator 24, and the FAPS 25 swing, and the address detector 26. In particular, the address is extracted from the push-pull P / P signal, and the WCK clock pulses used to decode the ADIP information are supplied to other appropriate system circuits. The swing pattern will be described in more detail below.

The read data signal from the matrix circuit 9 is binaryized in the binary format circuit 11 and then supplied to the encoding / decoding device 12, which functions as a decoding device for reading data and as an encoding device for recording data. When reading data, the encoding / decoding device 12 performs demodulation in accordance with a code with a series length limit, an error correction code, interleaving exception, etc. to get read data.

To read data, the encoding / decoding device 12 generates, by the FAPS processing, read clock pulses synchronous with the read data signal, and decode the data based on the read clock frequency. At each point in time of reading data, the encoding / decoding device 12 accumulates the decoded data described above in the buffer memory 20. Data recorded in the buffer memory 20 is read and transmitted as data read by the disk drive 30.

The interface 13, also included in the disk drive 30, is connected to an external host computer 40 and transmits data intended for writing read data and various commands between the disk drive 30 and the host computer 40. When data is read, the data being read is decoded and written to memory the buffer device 20 is transmitted via the interface 13 to the host computer 40. It should be noted that the read command and the write command and other commands coming from the host computer 40 are transmitted to the system controller 10 via interface 13.

On the other hand, data intended for recording is transmitted in the recording mode of data from the host computer 40. Data intended for recording is transmitted via interface 13 to the buffer memory 20, where they are accumulated. In this case, the encoding / decoding device 12 encodes the data contained in the buffer for recording by adding an error correction code, interleaving and superimposing a subcode, and performs encoding of the data as data intended for recording on the optical disc 100.

The device also comprises an encoding clock frequency generator 27 for generating an encoding clock frequency, which is a reference frequency for encoding data during recording. The encoding / decoding device 12 uses the encoding clock frequency to perform the above encoding operations. The coding clock generator 27 generates coding clock pulses from the WCK swing clock pulses that come from the FAPS 25 swing. As indicated above, the clock frequency of the data channel for recording is, for example, 66.033 kHz, the value of which is an integer multiple of the frequency fw1 of the monotonic swing. Since the FAPS 25 swing generates a clock frequency with a frequency fw1 of a monotonic swing, or a clock having an integer multiple of the frequency fw1, as a clock frequency of a wobble (WCK), it is easy to generate a coding clock by a coding clock 27 by dividing the clock PMC.

Data intended for recording generated during the encoding process in the encoding / decoding apparatus 12 is represented as an oscillation waveform in accordance with the recording strategy 21 and then transmitted as laser control pulses (WDATA recording data) to the laser control circuit 18. The recording strategy 21 compensates for the recording, that is, it makes fine adjustments to the optimal power of the recording beam in accordance with the characteristics of the recording layer, the shape of the laser light spot, the linear recording speed, etc., and also adjusts the waveform of the laser control pulse.

The laser control circuit 18 supplies a laser control pulse to the laser diode 4, which is provided as WDATA recording data for controlling the laser diode 4 for emitting laser light. Thus, recesses (recesses with phase change) are formed on the optical disc 100 in accordance with the recorded data.

In addition, the device has a 19 AUM (automatic power control) circuit (automatic power control) 19 for controlling the laser control circuit 18 while maintaining a constant laser output power so that it is not affected by ambient temperature or other factors by monitoring the laser output power based on the output signal detector 22 tracking. The AUM circuit 19 is supplied with a set value of the laser output power from the system controller 10 to control the laser control circuit 18 and maintain the set value.

The servo control circuit 14 (servo processor) generates various servo control signals based on the focus error signal FE and the track tracking error signal TE, which come from the matrix circuit 9, for performing the servo control operation. More specifically, the servo control circuit 14 generates a focus control signal FD and a track tracking control signal TD in accordance with the focus error signal FE and the track tracking error signal TE, and supplies them to the two-axis drive 16. This two-axis drive 16 controls the signals of the focusing coil and coil track tracking in the biaxial mechanism 3 of the optical head 1. In this case, the optical head 1, the matrix circuit 9, the servo processor 14, the biaxial drive 16 and the biaxial mechanism 3 together form a servo loop Track tracking controls and servo focus control loop. In addition, the servo control circuit 14 turns off the track tracking servo control loop in accordance with a transition command to another track coming from the system controller 10 to generate a track transition signal supplied to the two-axis drive 16, which leads to the transition of the optical head 1 from one track to another .

The servo processor 14 generates a progress control signal based on the progress error signal as a low-frequency component of the tracking error signal TE and under access control by the system controller 10, and transmits this signal to the progress drive 15. The advance drive 15 controls the advance mechanism 8 in accordance with the advance control signal that is received from the servo processor 14. The advance mechanism 8 includes a mechanism (not shown) formed using the main main shaft on which the optical head 1, the advance engine and the transmission mechanism are mounted etc. The advance motor in the advance mechanism 8 is controlled by the advance drive 15 in accordance with the advance control signal, and in accordance with this, the optical head 1 is advanced.

The device has a spindle servo control circuit 23 for controlling the spindle motor 6 for rotation under PLC conditions. The spindle servo control circuit 23 generates a spindle error signal SPE by acquiring clock pulses of the PMC that are generated by the FAPS 25 based on the swing information, namely, information about the current rotation speed of the spindle motor 6 and comparing it with information about a predetermined reference value of the PLC speed .

During data reading, read clock pulses (reference clock pulses for decoding) generated by the oscillating FAPS 25 in the encoding / decoding apparatus 21 is information about the current rotation speed of the spindle motor 6, and the spindle rotation error signal SPE can also be generated by comparing the read clock frequency with information about a predetermined reference speed of the PLC.

The spindle servo control circuit 23 generates a spindle control signal in accordance with the spindle error signal SPE, and transmits this signal to the spindle motor drive 17. In accordance with the spindle control signal, which comes from the spindle servo control circuit 23, the spindle motor drive 17 generates, for example, a three-phase signal of the spindle motor 6, driving the latter in rotation under PLC conditions. The spindle servo control circuit 23 also generates a spindle drive signal in accordance with the spindle acceleration / deceleration signal, which is received from the system controller 10, enabling the spindle motor 6 to turn on, stop, accelerate or decelerate.

The operation of the above servo system and the recording / reading system is controlled by a system controller 10, which is formed on the basis of a microcomputer. The system controller 10 performs various control operations in accordance with the commands from the host computer 40. For example, when a read command is sent to the system controller 10 from the host computer 40 to transmit data recorded on the optical disk 100, it first controls the operation search for access to a given address. Namely, the system controller 10 sends a command to the servo control circuit 14 (servo processor), which controls, so that the optical head 1 has access to the address specified in the search command. After that, the system controller 10 controls the necessary operations for transferring data recorded in the indicated data section to the host computer 40. Thus, data is read from the optical disk 100, decoding, accumulating them in a buffer and other processing, and the required data are transferred to the host computer 40.

When a write command is sent from the host computer 40, the system controller 10 controls the optical head 1 so that it moves to the area with the address where the data should be recorded. Then, the encoding / decoding device 12 encodes the data transmitted from the host computer 40, as described above. The WDATA write data comes from the write strategy circuit 21 to the laser control circuit 18, as described above, and data is recorded.

The disk control device 30, shown by way of example in FIG. 12, is connected to the host computer 40. However, the disk control device according to the present invention does not have to be connected to the host computer 40. In this case, the device can be installed the control panel and display, and the data input / output interface will be different in design from the interface shown in Fig. 12. That is, the recording and playback of data will be carried out in accordance with the operations performed by the user on the control panel, and various devices for input / output of data must be installed in the device.

A disk control device in accordance with the present invention can be constructed using many other forms, and can be designed as a disk control device for recording data or reproducing data.

Next, a swing circuit system that is installed in a disc control device in accordance with the present invention will be described.

Consider FIG. 13, which shows a block diagram of a swing pattern. On Fig shows the design of the demodulator 24 FMN, FAPS 25 swing and decoder 26 addresses that are included in the swing circuit system. As shown, the FMN demodulator 24 includes a bandpass filter 31, a comparator 32, a correlation detection circuit 33, a frequency detection circuit 34, a discriminator circuit 35, a synchronization detection circuit 36, and a gating signal generating circuit 37.

The push-pull signal P / P, coming as a swing signal from the matrix circuit 9, is fed to a bandpass filter 31 of the FMN demodulator 24. The band-pass filter 31 has a transmission characteristic of two different frequencies, that is, two frequencies fw1 and fw2, which are used in the above part of the single frequency and part of the FMN bit information. The component of the frequency signal fw1 or fw2 passing through the bandpass filter 31 is binary-computed in the comparator 32. The push-pull P / P signal is binary-coupled to the PLL 25, the correlation detection circuit 33, and the frequency detection circuit 34. The FAPS 25 swing is designed as a FAPS, which performs a phase comparison with the digitized push-pull P / P signal, and generates PWC clock synchronization pulses synchronous with the push-pull P / P signal. However, the push-pull P / P signal during the period corresponding to the portion of the FSK bit of the swing module information is masked by the GATE gating signal from the gating signal generating circuit 37, which will be described in more detail below, due to which the push-pull P / P signal corresponding to monotonic swing is synchronized parts of a single frequency. Thus, the pulses of the swing synchronization frequency control pulses contain the single frequency fw1 itself or the frequency correlating as an integer with the single frequency fw1.

It should be noted that part of the single frequency in the above swing module has a significantly longer period, for example, more than 10 times than the period of the part of the FSK bit information. Thanks to this, FAPS synchronization can be easily ensured.

FAPS 25 swing performs phase comparison exclusively with monotonic swing with frequency fw1 based on the GATE gating signal. Thus, the residual instability of the synchronization of the clock pulses of the swing frequency response, generated in accordance with the above description, is significantly reduced.

The clock pulses of the rocking frequency response, generated in this way, enter the various circuits of the FMN demodulator 24, as well as the address decoder 26, where they are used to demodulate the FMN and decode the ADIP information. In addition, as described above with reference to FIG. 12, the clock pulses of the swing PMC are supplied to the clock terminal 27 and to the spindle servo control circuit 23, where they are used as described above. In this case, since the clock pulses of the Swing PMC have high accuracy with a lower degree of residual non-synchronization, improved accuracy of the coding clock frequency, increased stability of the recording operation, and the stability of the spindle servo control are also improved.

The correlation detection circuit 33 and the frequency detection circuit 34 are for demodulating channel data that is contained, as part of the FSK bit of information, in the swing module. In this regard, at least one of these circuits 33 and 34 may comprise an FMN demodulator 24. However, when both of these circuits, the correlation detection circuit 33 and the frequency detection circuit 34 comprise an FMN demodulator 24, an effect occurs that will be described later. The correlation detection circuit 33 performs demodulation of the FSM by detecting the correlation for two periods of the clock frequency of the swing PM and demodulates the channel data. The frequency detection circuit 34 performs demodulation of the FSM by counting the edges for one period of the clock frequency of the swing PM and demodulates the channel data. The construction and operation of the correlation detection circuit 33 and the frequency detection circuit 34 are described below. Each of the circuits 33 and 34 is allocated channel bit data on the basis of the FSK modulation swing, that is, “0” and “1”, as channel bits expressed in units of the period of two monotonous swings, as shown in FIG. 4, and they arrive at discriminator circuit 35.

The discriminator circuit 35 performs AND and OR logical operations with respect to the channel bit values that come from the correlation detection circuit 33 and from the frequency detection circuit 34 and generates a channel bit value with respect to which the logical AND operation was performed or "OR", in the form of an FMN demodulated channel bit value. From the discriminator circuit 35, the channel bit value calculated in this way is supplied to the synchronization detection circuit 36. The synchronization detection circuit 36 performs synchronization detection based on the frequency of the incoming channel bit value.

As shown in FIG. 6, cluster synchronization includes channel bit values “1”, “1”, and “1”. In addition, in the part of the FSK bit of information consisting of three channel bits, the upper bit of the channel is always "1", as shown in Fig.6. On the other hand, during the period corresponding to the portion of the single frequency, the value of the FSK demodulated channel bit is always “0”. Therefore, the first “1” after the sequence of “0” bit values of the channel will be the upper part of the FSK bit of information, and the period including such “1” will be equivalent to the period of the swing module. By detecting such a periodicity, it is possible to determine the period of each swing module, and when a sequence of three channel bits "1", "1" and "1" is determined in the swing module, it becomes possible to determine that this swing module is the top module of 98 swing modules forming together cluster synchronization, that is, one ADIP information.

The synchronization detection circuit 36 thus detects the timing relationships of the synchronization and transmits the synchronization signal 31 to the gate signal generating circuit 37 and the address decoder 26. The gating signal generating circuit 37 generates a gating signal GATE based on the synchronization signal SI, which is supplied from the synchronization detection circuit 36. That is, since the period of the swing module is determined from the timing of the synchronization signal SI, the period of the bit part of the FSK information in the swing module can be obtained by counting clock pulses of frequency fw1, based on the synchronization signal SI. Thus, the gating signal GATE, designed to mask the period of the bit part of the FSK information, is generated to control the operation of the comparison phase FAPS 25 swing.

It should be noted that although it has been described above that the discriminator circuit 35 performs the logical operation “AND” or “OR” with respect to channel bit values coming from the correlation detection circuit 33 and the frequency detection circuit 34, the discriminator circuit 34 performs the logical operation “ And "in relation to such channel bit values during the FAPS synchronization capture period 25 of the swing to perform synchronization based on the above synchronization detection and the gating signal GATE obtained from the detected with synchronization.

Since, with respect to channel bit values coming from the correlation detection circuit 33 and the frequency detection circuit 34, the logical operation “AND” is performed as described above, the channel bit values have improved reliability, whereby synchronization detection can be performed with improved accuracy and with less error level. On the other hand, after synchronizing the FAPS based on the detection of synchronization, it is necessary to switch the logical operation "AND" to the logical operation "OR", due to this synchronization is protected on the basis of periodicity. Particularly, due to the logical “OR” operation being performed with respect to channel bit values coming from both the correlation detection circuit 33 and the frequency detection circuit 34, the probability of detection loss due to loss of the channel bit value can be reduced due to which can provide improved reliability for decoding ADIP information.

The discriminator circuit 35 receives the FMN demodulated channel bit values by performing a logical "OR" operation with respect to the channel bit values coming from the correlation detection circuit 33 and the frequency detection circuit 34, after the clock frequency of the swing PM is set to a stable level due to FAPS synchronization, which allows the separation between data “0” and data “1”, used as information bits of a part of the FSK bit of information for each swing module, represented by three channel bits, and transmits an information bit to address decoder 26. The decoder 26 addresses allows you to receive address information from 98 bits, which was described above with reference to tables 2 and 3, by obtaining bits of information in relation to the timing of the signal SI synchronization, and thus decodes the value of the Dad address, which is contained in the swing grooves, and transmits the address value to the system controller 10.

A correlation detection circuit 33 for performing FMN demodulation is constructed as shown in FIG.

The push-pull signal, after it has been binary-converted using the comparator 32, which is shown in FIG. 13, arrives at the delay circuit 112 and also at one of the inputs of the exclusive-OR logic element 113 (EX-OR). The output of the delay circuit 112 is connected to another input of the exclusive-OR circuit 113. The clock frequency of the oscillation DOT arrives at the 1T change circuit 111. The 1T measurement circuit 111 measures one period of the oscillation frequency of the swing point and controls the delay circuit 112 to provide a delay equal to one period of the oscillation frequency of the oscillation point. Therefore, the exclusive-OR circuit 113 performs a logical operation between the push-pull signal and the push-pull signal delayed by a 1T period. The low-frequency components are extracted from the output signal from the exclusive-OR circuit 113 using a low-pass filter 114 and binary-converted using a comparator 115. The binary-converted signal from the comparator 115 is supplied as a synchronized output signal to D- trigger 116, synchronized by the clock frequency of the swing frequency response. The synchronized output signal represents the output values "0" or "1", which are the channel bits in the period modules of two monotonous swings, and are fed to the discriminator circuit 35.

Timing diagrams depicting the operation of the correlation detection circuit 33 are shown in Figures 15A-15G. It should be noted that the timing diagrams corresponding to the operation of this circuit include push-pull signals that arrive during the period of a part of the FSK bit of information in the form of cluster synchronization. That is, the period shown as part of the FSK information bit in the input push-pull signal shown in FIG. 15B is a binary nine-sweep sequence with frequency fw2, which is shown as the cluster synchronization in FIG. 6.

On figa shows the clock pulses of the PMC swing. The exclusive-OR circuit 113 is provided with the binary-encoded push-pull signal shown in FIG. 15B and the binary-encoded push-pull signal shown in FIG. 15C, which has been delayed by one period of the swing clock in the delay circuit 112. When such push-pull signals are applied, the output of the exclusive-OR circuit 113 produces the signal shown in FIG. 15D. The shape of this output signal is set by the low-pass filter 114 so that it has a shape including only the low-frequency components, as shown in FIG. 15E, and is binaryized in the comparator 115 so that the waveform shown in FIG. 15F is obtained. This signal enters the D-flip-flop 116, from which it exits as a signal, synchronized in time with the clock frequency of the swing point. Thus, the signal shown in FIG. 15G is supplied as the FSK demodulated channel bit value to the discriminator circuit 35. The explanation given here is based on an example of a part of the FSK bit of the cluster synchronization information. Thus, the waveform during the period corresponding to the bit part of the FSK information has a high value of "N" for 6 periods of the clock frequency of the swing, as shown in the drawing. That is, it represents a channel bit that takes the values "1", "1" and "1", expressed in units of 2 periods of the clock frequency of the swing (the period of two monotonous swings). Namely, a signal is generated that is represented as a bit of the cluster synchronization address in FIG. 4. If the waveform is a part of the FSK bit of information that represents the data “0” or “1”, the waveform during this period will be as shown in FIG. 4 as the data address bit “0” or “1”.

As described above, in the optical disc in accordance with the present invention, two different frequencies fw1 and fw2 are used to swing a track or groove. The frequency fw2, for example, is 1.5 times higher than the frequency fw1. The frequencies fw1 and fw2 are chosen in such a ratio that each of them allows you to perform an even number of oscillation periods or an odd number of oscillation periods during a predetermined cycle. In this case, the push-pull signal converted into binary form and binary push-pull signal delayed by one period of the clock frequency of the swing with frequency fw1 will be in the opposite phase with respect to each other for the part of the swing with frequency fw2, namely, for the part modulated FSK corresponding to the value of the channel bit "1", as can be seen by comparing figures 15B and 15C. Thus, it is possible to easily demodulate the FMN using, for example, the logical operation "exclusive OR". It should be noted that demodulation, of course, can be performed using the logical operation "exclusive OR", or using another logical operation.

The frequency detection circuit 34, also included in the FMN demodulator 24 for performing the FMN demodulation, has the structure shown in FIG. 16.

The push-pull signal, converted to binary in the comparator 32 shown in FIG. 13, is supplied to a leading edge counting circuit 121, which counts the number of leading edges of the push-pull signal in each clock cycle of the swing DTC. According to the counting result, the leading edge counting circuit 121 generates an output of “0” or “1”. The output from the leading edge counting circuit 121 is connected to one of the inputs of the OR logic 123, as well as to the D-flip-flop 122. The signal arriving at the D-flip-flop 122 is delayed by one clock cycle in the D-flip-flop 122 by synchronizing the output the signal at the time of the clock frequency of the swing counter and goes to another input of the logic circuit 123 "OR". The output signal, in relation to which the logical operation "OR" was carried out, from the logic circuit 123 "OR", represents the output values "0" or "1", which are the bits of the channel, expressed in units of the period of two monotonous swings, and enters discriminator circuit 35.

Timing diagrams corresponding to the operation of the frequency detection circuit 34 are shown in FIGS. 17A-17E. Timing diagrams include push-pull signals that arrive during the period of a part of the FSK bit of information used as cluster synchronization. That is, the period shown as part of the FSK information bit in the input push-pull signal shown in FIG. 17B is a binary nine-sweep sequence with frequency fw2, which is shown in FIG. 6 as cluster synchronization.

On figa shows the pulses of the clock frequency of the PMC swing. The leading edge counting circuit 121 counts the number of leading edges of the push-pull signal during each clock cycle of the swing PM. 17B, each leading edge is indicated by a small circle. As can be seen in figures 17B and 17C, the leading edge counting circuit 121 generates an “0” value at the output when one leading edge was counted for one period of the clock frequency, and generates an “1” value at the output when two such front. With respect to the signal shown in FIG. 17C, which is generated at the output of this circuit, and the signal shown in FIG. 17D, which is a signal delayed by period 1T in the D-flip-flop 122, a logical “OR” operation is performed using a logical OR circuits 123 for receiving the output signal shown in FIG. The signal generated in this way is supplied as the FSK-demodulated value of the channel bit to the discriminator circuit 35. The explanation given here is made using an example of a part of the FSK bit of cluster synchronization information. Thus, the timing chart during the period corresponding to the portion of the FSK bit of information acquires a high value of "N" for 6 cycles of the clock frequency of the swing, as shown in the drawing. That is, the channel bit takes the values "1", "1" and "1", expressed in units of 2 periods of the clock frequency of the swing (the period of two monotonous swings). Namely, a signal is generated with the shape shown in FIG. 4 as a bit of the cluster synchronization address. If this signal corresponds to the part of the FSK bit of information indicating data “0” or “1”, the change in signals during this period will, as shown in FIG. 4, be data address bits “0” or “1”.

In addition, in the frequency detection circuit 34, two different frequencies fw1 and fw2 are used to swing a track or groove. The frequencies fw1 and fw2 are in such a ratio that each of them is a clear number of periods and an odd number of periods during a predetermined cycle. Thus, it is possible to easily demodulate the FMN using a very simple circuit design, which is shown in FIG. 16.

It should be noted that the aforementioned counting of the leading edges can be replaced by counting the falling edges.

The second embodiment:

2-1 Swing Method

Next, a second embodiment in accordance with the present invention will be described. It should be noted that the second embodiment also relates, for example, to a disc called "DVR" (digital video recording disc), and the physical characteristics of such an optical disc are similar to that described above with reference to Table 1 and Figs. 4A and 4B. . The slicing device for use in the manufacture or manufacture of the optical disc and the disc drive for reproducing the optical disc are also basically the same as those described above and which relate to the first embodiment of the invention. Thus, the components of the second embodiment, also used in the first embodiment, will not be further described here. Below will be described only the swing method and the associated demodulation method, in part, different from those described in the first embodiment. In explaining the demodulation method, for example, the construction of the demodulation scheme used in the disc drive, which is included in the second embodiment and corresponds to the FMN demodulator 24 shown in FIG. 12, will also be described.

On figa-18F shows the oscillation modes of the swings, which, when using modulation MNMS (manipulation with minimal shift), are also included in the above-described modulation method FMN, designed to modulate the address of the track with the swing and the detection window swing, in the case L = 4 for demodulation of the address. It should be noted that “L” indicates the length of the swing detection window and “L = 4” means that the detection module corresponds to a period of four monotonous swings. When the timing diagram of the data (channel bit) used as the address information intended to be recorded in the swing track is the timing diagram (data) shown in Fig. 18D, such data is pre-encoded to obtain pre-encoded data, as shown in Fig. 18E. For example, the data is pre-encoded so that the pre-encoded data is set to “1” at the time of the logical inversion of the data. MNMS modulation is performed using pre-encoded data to generate an MNMS modulation signal stream, as shown in FIG. 18F.

In accordance with a second embodiment of the invention, two different frequencies fw1 and fw2 are used to modulate the MHMS. The frequency fw1 coincides with the carrier frequency modulation MNMS, as shown in figs. The frequency fw2, for example, is 1.5 times greater than the frequency fw1 (for it, the signal length is 2/3 of the signal length for the frequency fw1). As shown in FIG. 18A, for example, 1.5 swings with a frequency fw2 that is 1.5 times higher than the carrier frequency correspond to pre-encoded data “1”, while one swing with a frequency fw1 matching the carrier frequency, corresponds to the pre-encoded data "0", as shown in figv. A period of 1.5 swings with a frequency fw2 corresponds to a period of one sweep at a frequency fw1 (= carrier frequency).

In figures 19A-19C shows the flows of each of the temporal swing patterns, including the part modulated by the MNMS. On figa shows a monotonic bit, which is a sequence of swings at one frequency (which is equal to the frequency fw1). A monotone bit includes 56 monotone swings. On figv shows the ADIP bit, which also has a period of 56 monotonous swings. The ADIP module, which is 12 of the 56 monotonous swings, is part of the MNMS information bit. That is, part of the MNMS information bit is precoded data modulated by the MNMS with frequencies fw1 and fw2. Part of the MNMS information bit includes address information. The other 44 monotonous swings in the ADIP bit are a sequence of 44 swings with a single frequency (= frequency fw1). On figs shows a synchronization bit, also having a period of 56 monotonic swings, of which 28 monotonous swings together form a synchronization module. The precoded data is modulated MNMS with frequencies fw1 and fw2, as described above. The synchronization information is represented using the structure of the synchronization module. The other 28 monotonous swings in the synchronization bit are a sequence of 28 swings with a unit frequency fw1 (= carrier frequency). The ADIP bit, the monotonous bit, and the synchronization bit correspond to one bit that forms an address block (of 83 bits), which represents one piece of address information (ADIP) and which will be described later.

According to a second embodiment of the invention, one RUB (recording module unit), which is a recording data unit, includes three ADIP addresses, as shown in FIGS. 20A and 20B. As described above with reference to figures 7 and 8, “RUB” is a data module corresponding to one ECC block to which input and output data are added. In this case, one RUB contains 498 frames (498 rows). As shown in FIG. 20A, a section corresponding to one RUB includes three ADIP address blocks. One address block consists of 83 bits, which are ADIP data. As shown in FIG. 19, since the ADIP bit and the monotonic bit correspond to a period of 56 monotonic swings, one address block corresponds to a period of 4648 (= 83 x 56) monotonic swings. The monotonic bit, the synchronization bit, and the ADIP bit correspond to the above description with reference to FIG. 19. The synchronization bit and the ADIP bit are formed so that they have oscillations with a waveform of modulated MNMS.

20B shows the structure of one address block. An address block of 83 bits includes a part of a synchronization signal of eight bits and a part of data of 75 bits. The eight-bit synchronization signal part includes four synchronization blocks, each of one monotonic bit and one synchronization bit. Part of the 75-bit data includes 15 modules, each of which contains one monotonic bit and four ADIP bits. The monotonic bit, the synchronization bit, and the ADIP bit used here have been described above with reference to FIG. 19. The synchronization bit and the ADIP bit form the oscillation waveform of the modulated MNMS.

First, a structure from a portion of the synchronization signal will be described with reference to FIGS. 21A and 21B.

As shown in figa and 21B, part of the synchronization signal is formed of four synchronization blocks "0", "1", "2" and "3". Of the four synchronization blocks, one block "0" is formed from one monotonic bit and synchronization "0". Synchronization block “1” is formed from one monotonic bit and synchronization “1”, synchronization block “2” is formed from one monotonic bit and synchronization “2”, and synchronization block “3” is formed from one monotonic bit and synchronization “3”.

In each synchronization block, a monotonic bit is a 56-sweep signal with a single frequency representing the carrier frequency, as described above and as shown in FIG. 22A.

The synchronization bits include four types of synchronization bits: synchronization bits from "0" to "2", as described above. For each of these four types of synchronization bits, a swing signal is generated, which is shown in Figures 22A, 22B, 22C, and 22D. Each synchronization bit consists of a synchronization module having a period of 28 monotonic swings and 28 monotonic swings. Synchronization modules differ in signal structure. In figures 22B, 22C, 22D and 22E shows the structure of the waveform in the synchronization module and the data structure as address information corresponding to the waveform. As shown in figures 18D and 18F, one channel bit, as channel information, corresponds to a period of four monotonous swings. The channel bit stream, as address information, is precoded with the formation of precoded data, as shown in FIG. 18E, to form a swing oscillation structure of the modulated MNMS.

First, the synchronization bit "0" forms the data stream of the channel bit "1010000" in the synchronization module, as shown in figv. Namely, it generates swings corresponding to the data stream with precoding "1000100010001000000000000000". More specifically, the synchronization bit “0” forms a modulated MNMS swing structure, so that part of the precoded data corresponding to “1” is 1.5 swings with a frequency fw2, while the part corresponding to “0” is one swing with a frequency of fw1.

The synchronization bit “1” generates a channel bit data stream “1001000” in the synchronization module, as shown in FIG. 22C, and generates a swing waveform corresponding to the previously encoded data stream “1000100000001000100000000000”.

The synchronization bit "2" generates a data stream of the channel bits "1000100" in the synchronization module, as shown in Fig.22D, and generates a waveform corresponding to the stream of precoded data "1000100000000000100010000000".

The synchronization bit “3” generates a channel bit data stream “1000010” in the synchronization module, as shown in FIG. 22E, and generates a swing waveform corresponding to the pre-encoded data stream “1000100000000000000010001000”.

Four structures of synchronization bits are laid out in each synchronization block. Thus, when the disc drive detects one of four structures of the synchronization modules in a portion of the synchronization signal, synchronization between the synchronization modules can be obtained.

Next, the structure of the data part of the address block will be described with reference to figures 23A and 23B.

As shown in FIGS. 23A and 23B, a portion of the data is formed from 15 ADIP blocks from “0” to “14”. Each of the ADIP blocks consists of 5 bits. The five bits of each ADIP block include one monotonic bit and four ADIP bits. Similar to the synchronization block, the monotonic bit in each ADIP block is a waveform representing a sequence of 56 swings with a unit frequency representing the carrier frequency, as shown in FIG. 24A. Since one ADIP block includes four ADIP bits, fifteen ADIP blocks together form address information from 60 ADIP bits. One ADIP unit consists of one ADIP module, which has a period of 12 monotonous swings and 44 monotonous swings. 24B shows a swing waveform structure with an ADIP bit having a value of “1” and a data structure representing address information corresponding to a swing waveform. On figs shows the structure of the waveform of the swing signal with the ADIP bit having the value "0", and the data structure of the address information corresponding to the waveform of the swing. Each of the ADIP bits "0" and "1" is represented by three channel bits in a period of 12 monotonic swings. One channel bit is a period of four monotonous swings. The ADIPI bit “1” forms the channel bit data stream “100” in the ADIP module, as shown in FIG. 24B. Namely, it generates a swing signal corresponding to the pre-encoded data stream “100010000000”. More specifically, for the ADIP bit “1”, a structure of the MNMS of modulated swings is formed such that the part of the precoded data corresponding to “1” contains 1.5 swings with a frequency fw2, while the part corresponding to “0” is one swing with frequency fw1. As shown in FIG. 24C, the ADIP bit “0” generates the channel bit data stream “010” in the ADIP module, namely, according to it, a swing signal corresponding to the precoding data stream “000010001000” is generated.

The above-described rocking method, in accordance with the present invention, is characterized by the following.

The swing is a sequence of ADIP bits and a synchronization bit, having a waveform, respectively, obtained by modulating the MNMS of an information bit and a monotonic bit, which forms a part with a single frequency based on the waveform of a single frequency fw1 (carrier frequency). Namely, the parts modulated by the MNMS, which contain the actual bit of information, will be individually stacked on the rocking track (in the groove). Separate arrangement of parts modulated by MNMS allows to significantly reduce the effect of crosstalk even when using a narrow pitch of tracks. When modulating MNMS, two different frequencies fw1 and fw2 are used. Of these various frequencies, the frequency fw1 has the same frequency as the frequency of monotonous wobble (carrier frequency). The frequency fw2 is selected, for example, 1.5 times higher than the frequency fw1, so that the ratio between the frequencies fw1 and fw2 ensures that the number of periods of both frequencies alternately amounts to an even and odd number during a predetermined cycle.

In terms of the MNMS information bit, a period of four monotonous swings represents one channel bit (in the case when it corresponds to the length (L = 4) of the swing detection window), forming an information bit. The length of the period of a portion of the ADIP modulated ISM bit of the ADIP bit is a period of 12 monotone swings, that is, a period that is a multiple of an integer number of monotone sweep cycles. These properties make demodulation of FMN easier. In the disk drive, which will be described later, the demodulation of the MNMS is simplified because the demodulation is carried out in units of a period of multiple swings, for example, a period of four monotonous swings. The relationship between the swing and the data intended for recording is such that an integer number (for example, three) of the ADIP information addresses is used for one RUB to ensure correspondence between the swing of the groove and the data intended for recording. In the part of the MNMS information bit, phase continuity is ensured at the switching point between the frequencies fw1 and fw2. Thus, rocking using modulation of MNMS does not lead to the formation of a high-frequency component as when rocking using modulation of FMN.

2-2 Demodulation

Below will be described the demodulation corresponding to the swing method, in accordance with the second embodiment of the present invention. It should be noted that the disk drive is designed in a similar manner to the drive shown in FIG. 12, and the components of the circuit used instead of the bandpass filter 31, comparator 32, correlation detection circuit 33, and frequency detection circuit 34 in the FMN demodulator 24 in FIG. 13 will be described with reference to FIG.

To demodulate the MNMS, bandpass filters 151 and 152, respectively, a multiplier 153, an adder 154, an accumulating adder 155, a selection and retention circuit 156, and a two-way stopper 157, as shown in FIG. 25, are installed. It should be noted that components such as the FAPS 25 swing, the address decoder 26 and the coding clock 27, etc. included in the second embodiment are similar to these elements shown in FIG. 12 and will not be further described. The output signal from the circuit shown in FIG. 25 (coming from the double-sided limiter 157) is transmitted to the discriminator circuit 35 included in the FMN demodulator 24, which is shown in FIG. 13. Namely, it is assumed that the discriminator circuit 35, the synchronization detection circuit 36, and the gating signal generating circuit 37 shown in FIG. 13 are similar to those installed downstream of the circuit shown in FIG. 25.

The push-pull P / P signal coming as a swing signal from the matrix circuit 9 of FIG. 12 is supplied to each of the bandpass filters 151 and 152 shown in FIG. 25. The bandpass filter 151 has a characteristic of the passband frequency bands corresponding to the frequencies fw1 and fw2 that pass through it. The band-pass filter 151 isolates the swing component, that is, the signal modulated by the MNMS. On the other hand, the band-pass filter 152 has such a narrow-band characteristic that only transmits the frequency fw1, that is, the carrier frequency component, and thus it extracts the carrier frequency component. The adder 153 multiplies the output signals of the bandpass filters 151 and 152, the Product of the adder 153 and the output signal from the accumulating adder 155 approach the adder 154. The accumulating adder 155 is reset by the reset signal CLR, expressed in units of a period of four swings (in the case when L = 4 ) or a period of two swings (in the case when L = 2). Thus, the glowing adder 155 forms an integrated value over a period of four or two swings.

The output of the accumulating adder 155 is stored in a selection and hold circuit 156. The selection and hold circuit 156 selects and holds the signal at times of synchronization of the hold control signal sHOLD. The output signal from the selection and retention circuit 156 is converted to binary using a two-way limiter 157, which is configured as a comparator. The output data, converted into binary form, is the channel bit data forming the address information, and enters the circuit located downstream, namely, the discriminator circuit 35, as shown in FIG. 13. In the discriminator circuit 35, the data is divided into data having the value of an ADIP bit or a synchronization bit. The ADIP bit thus separated is supplied to the address decoder 26, as shown in FIGS. 12 and 13, where the ADIP address contained therein is decoded. The synchronization bit is processed in the synchronization detection circuit 32 shown in FIG. 12 in the same manner as described with reference to FIG.

The demodulation of MNMS will be described with reference to the timing diagrams presented in figures 26A and 26B. The waveforms depicted in this drawing are those obtained when the length L of the swing detection window is L = 4.

On figa shows pre-encoded data, the waveform of the swing signal MNMS (L = 4), generated in accordance with the pre-encoded data, and the carrier frequency obtained at the output of the bandpass filter 152 (BPF out). On figv shows the output signal from the adder 153 (Demod out) (output signal demodulation), which comes from the output of the glowing adder 155 (Int (L = 4)) and from the output of the circuit 156 selection and retention (h (L = 4) ) Multiplication performed in the multiplier 153 of the MNMS swing signal (L = 4), as shown in FIG. 26A, by the carrier frequency (BPF out) allows the signal (Demod out) to be generated, which is shown in FIG. 26B. The glowing adder 155 and the adder 154 form a signal (Int (L = 4)) integrated in units of four swings. The integrated signal (Int (L = 4)) selects and holds in the selection and hold circuit 156 also in units of four swings and generates an output signal (h (L = 4)). The output waveform (h (L = 4)) is limited to generate a binary signal in a two-way limiter 157 for detecting channel bit data before precoding.

Figures 27A and 27B show waveforms obtained when the length L of the swing detection window is L = 2. In figures 27A and 27B, as in figures 26A and 26B, precoded data is shown, the MNMS swing signal (L = 2), the carrier frequency (BPF out), the output signal from the adder 153 (Demod out), the output signal from the glowing adder 155 (Int (L = 2)) and the output from the selection and retention circuit 156 (h (L = 2)). Multiplication in the multiplier 153 of the MNMS swing signal (L = 2) by the carrier frequency (BPF out) allows to generate a signal (Demod out), which is shown in Fig. 26B. The glowing adder 155 and the adder 154 form a signal (Int (L = 2)), integrated in units of two swings. With respect to the integrated signal (Int (L = 2)), selection and retention is performed in the selection and retention circuit 156 in units of two swings to obtain an output signal (h (L = 2)). With respect to the output signal (h (L = 2)), a binary two-way restriction is produced using a two-way limiter 157 to detect channel bit data before precoding.

In accordance with the present invention, the length of the swing detection window can be increased by a period of many swings, thereby simplifying the demodulation of the MNMS and increasing its accuracy.

As can be seen when comparing between the integrated signal (Int) and the signal (h), for which the selection and retention were performed, which are shown in figures 26A and 26B and in figures 27A and 27B, respectively, the length (L = 4) of the detection window swings provides a 2 times larger integration area than is provided with a length (L = 2), and, thus, the signal will be 2 times larger. The noise level at L = 4 does not increase by 2 times compared to the noise level when L = 2, but by √2 times.

Thus, when the sum is L = 4, the signal-to-noise ratio (S / N) will be 3 dB better than with L = 2. Therefore, the bit error at L = 4 will be less than the bit error at L = 2. In this regard, since the length of the swing detection window is increased, by using the swing method in accordance with the present invention, it will be understood that more reliable demodulation of the MNMS and ADIP decoding are provided.

The present invention has been described with respect to its embodiments in the form of a disc, a slicing device for manufacturing or manufacturing a disc, and a disc drive in which the disc is used as a recording medium. However, the present invention is not limited to the specific embodiments described above, and may be modified in various forms within the spirit and scope of the present invention defined by the claims below.

Industrial applicability

As described above, a disc recording medium in accordance with the present invention comprises swings formed on it, each of which is a sequence of predetermined signal modules, each of which consists of a part of the FSK bit of information and a part of a single frequency corresponding to a single frequency signal . Since the parts modulated by the FMN (or modulated MNMS) are thus formed separately, the effect of crosstalk from neighboring swing tracks is reduced, which is very preferable to improve the recording density using a smaller pitch of the tracks. That is, the present invention is preferably applicable as a swing method for a high capacity disc.

The slicing device in accordance with the present invention includes means for generating a sequence of predetermined signal modules, each of which consists of a signal part obtained by modulating the FSK information bit and a part of a single frequency signal. In this case, a slicing method using a single beam in a slicing device for producing a disc recording medium with a large recording capacity can be used.

A disk drive in accordance with the present invention is a highly efficient device in which information, such as an address, can be extracted from a swing groove formed on a disk recording medium. More specifically, the clock reproduction module makes it possible to easily and accurately generate the sweep repetition clock frequency using the FAPS based on a signal corresponding to a portion of the single frequency of the sweep signal having the shape of a single frequency signal. This ensures stable operation of the disk drive due to the generation of the coding clock frequency for processing data intended for recording, and for controlling the spindle servo drive based on the swing clock frequency. FAPS can operate on the basis of the gating signal generated on the basis of detection of synchronization, to ensure stable operation of FAPS only on the basis of the signal corresponding to part of the single frequency of the swing signal. Thus, FAPS allows faster capture of synchronization and provides more accurate reproduction of the clock frequency.

In addition, the swing formed on the disk recording medium in accordance with the present invention includes a part of a single frequency, the length of which is substantially greater than the length of the part of the bit of information FMN. Thus, it becomes possible to easily capture the FAPS synchronization using a portion of a single frequency. In this case, FMN demodulation of the signal corresponding to a part of the FMN bit of the swing information can be easily obtained, and high accuracy is ensured by detecting correlation or detecting frequency.

Claims (30)

1. Disc recording medium on which a spiral track is formed with a swing in the form of a groove or a platform on which data is recorded, and the track is swung in the form of a sequence of predetermined signal modules, each of which consists of a part of a frequency manipulation bit (FMN) of information corresponding to the waveform obtained by modulating the FSK bit information, and part of a single frequency corresponding to a single frequency waveform. 2. The disk recording medium according to claim 1, characterized in that two different frequencies are used to modulate the FMN, the first of these frequencies being selected equal to a single frequency, and the second frequency selected to be different from a single frequency, and these frequencies are selected in such a ratio that each of them has an even number of swings and an odd number of swings alternately during a predetermined cycle. 3. The disk recording medium according to claim 2, characterized in that the second frequency contains a frequency with a value of 1.5 or 1 / 1.5 of the value of the first of the frequencies. 4. The disk recording medium according to claim 1, characterized in that, in the part of the FMN bit of information, a period of 2 frequency swings such as a single frequency corresponds to one channel bit used as an information bit. 5. The disk recording medium according to claim 1, characterized in that the length of the period of the bit part of the FSK information is an integer multiple of the period of a single frequency. 6. The disk recording medium according to claim 1, characterized in that in a predetermined module, the period duration of the single frequency part is substantially 10 times the period of the part of the FSK information bit. 7. The disk recording medium according to claim 1, characterized in that the integer multiple in a predetermined module corresponds to the length of time of the recording module data for recording on the track. 8. The disk recording medium according to claim 1, characterized in that the clock frequency of the data channel intended for recording on a track is an integer multiple of a single frequency. 9. The disk recording medium according to claim 1, characterized in that the frequency used as a single frequency is a frequency located between the frequency band of the servo control track tracking and the frequency band of the read signal. 10. The disk recording medium according to claim 1, characterized in that a part of the FSK information bit is generated based on the waveform obtained by modulating the FSK information bit used as address information. 11. The disk recording medium according to claim 1, characterized in that two different frequencies are used for modulating the FSK for a part of the FSK bit of information, one of which continuously continues in phase with respect to the other at the switching point from one to the other. 12. The disk recording medium according to claim 1, characterized in that the modulation of the FSK is a modulation of MNMS (manipulation with a minimum shift). 13. The disc recording medium according to claim 12, characterized in that a part of the FSK information bit is obtained by modulating the ISM information bit, wherein a period of 4 swings of the frequency used as a single frequency corresponds to one channel bit used as the information bit. 14. The disc recording medium according to claim 13, characterized in that a part of the FSK bit of information obtained by modulating the ISM information bit includes two different frequencies, of which the first is the same frequency as a single frequency, and the second is a frequency x times greater than a single frequency, and a period of 4 swings includes a period of four swings of the first frequency and a period of x swings of the second frequency, and three periods of swings of the same frequency. 15. The disk recording medium according to 14, characterized in that the number x is chosen equal to 1.5. 16. A slicing device comprising means for generating a sequence of predetermined signal modules, each of which consists of a part of a signal obtained as a result of frequency manipulation (FMN) of modulating an information bit and a part of a single frequency signal, means for generating a control signal based on a signal from signal generating means, laser source means, laser light deflecting means from the laser source means based on a control signal received from the generating means a control signal, and means for cutting the disk substrate by emitting laser light onto the disk substrate through laser light deflecting means for forming a rocking track on the disk substrate, said track including a sequence of predetermined modules, each of which consists of a part of the FMN bit of information based on the waveform obtained as a result of the FSK modulation of the information bit, and a portion of the single frequency based on the waveform of the single frequency. 17 . A disk drive device for writing data to or reading data from a disk recording medium on which a spiral track is formed with a swing in the form of a groove or area along which data should be recorded, and in which the track swing is a sequence of predefined modules a signal, each of which consists of a part of a bit of frequency manipulation (FMN) of information corresponding to the shape of the signal obtained as a result of FMN modulation of an information bit, and part of a single hour from a signal corresponding to a single frequency waveform, the apparatus comprising a head means for emitting laser light onto a track for generating a backward incoming light signal, means for extracting a swing signal based on the sway of the track from the backward incoming light signal, and means for decoding the swing information intended for the implementation of the FMN demodulation of the swing signal, for decoding information represented by the information bit. 18. The disk drive device according to claim 17, wherein the swing information decoding means includes a clock reproduction module for generating, using the FAPS, a swing reproduction clock based on a signal corresponding to a portion of a single frequency of the swing signal, a FMK demodulator for the implementation of the FMN demodulation of the swing signal corresponding to the bit part of the FSM information from the swing signal to obtain demodulation data, and a decoder for decoding Bani necessary information consisting of information bits of the demodulation data received from the FSK demodulator. 19. The disk drive device according to claim 18, characterized in that the FMN demodulator includes a correlation detection circuit for performing FMN demodulation by detecting correlation with respect to the swing signal. 20. The drive device of the disk according to claim 19, characterized in that the correlation detection circuit detects the correlation between the swing signal and the delay signal obtained by delaying the swing signal for a period of the swing playback clock frequency. 21. The disk drive device according to claim 18, wherein the FMN demodulator includes a frequency detection circuit for performing FMN demodulation by detecting a frequency of a swing signal. 22. The drive device of the disk according to item 21, wherein the frequency detection circuit detects the number of leading edges or trailing edges of the swing signals falling in one period of the clock frequency of the swing playback. 23. The disk drive device according to claim 18, wherein the FMK demodulator includes a correlation detection circuit for performing FMK demodulation by detecting correlation with respect to the swing signal, and a frequency detection circuit for performing FMK demodulation by detecting the frequency of the swing signal, and the decoder is configured to decode the required information using demodulation data demodulated using the correlation detection circuit, and OF DATA, demodulated frequency detection circuit. 24. The disk drive device according to claim 23, wherein the decoder is adapted to decode the required information from the logical product of the demodulated data coming from the correlation detection circuit and data coming from the frequency detection circuit when the FAPS is synchronized in the clock reproduction module, and is adapted to decode the required information from the logical sum of the demodulated data coming from the correlation detection circuit and the demodulated data Originating from the frequency detection circuit when the PLL stably in module playback clock frequency. 25. The disk drive device according to claim 18, wherein the decoder includes a strobe generator for generating a strobe signal for the FAPS in the clock reproduction module based on decoding synchronization information as one of the necessary information, and the FAPS operates on the basis of the strobe signal for ensure the operation of the FAPS based solely on the part of the signal corresponding to a single frequency of the swing signal. 26. The disk drive device according to p. 18, characterized in that it further comprises means for servo-control of the spindle, designed for servo-control of the spindle using a clock frequency of reproduction of the swing. 27. The disk drive device according to claim 18, characterized in that it further comprises means for generating an encoding clock frequency synchronous with the swing reproduction clock, and which is intended for encoding data for recording. 28. The disk drive device according to claim 18, characterized in that the swing information decoding means includes an MNMS demodulator (minimum shift keying) for modulating the MNMS of the MNMS modulation signal corresponding to a portion of the FSK bit of the swing signal information to generate demodulation data. 29. The disk drive device according to claim 28, wherein the MNMS demodulator demodulates the MNMS modulation signal in modules of 4 swing periods with a frequency equal to a single frequency to obtain a modulation signal. Priority on points: 03/07/2002-pp. 1-29

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