Device for recording data on disc and/or playback of data from disc, device for detecting slant error of device for playing data from optical disc

FIELD: optical discs.

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

EFFECT: higher efficiency.

2 cl, 15 dwg

 

This invention relates to optical recording device/playback for recording digital data on a disk and reproducing digital data from a disk and, more particularly, to a method of detecting errors of the servo motor by comparing the levels of the synchronous signals recorded in the header area of the disk device, is suitable for this method, the disk, which guarantees the quality of out-of-phase signal, which is the basis for optimal control of the servo motor, the control method by the control device, recording/playback method of detection (corner) of the error sequence and the method of detecting errors of the slope.

Naiblizhajshee analogous to the claimed technical solution is the technical solution disclosed in U.S. patent No. 4707816 from 17.11.1987, which contains a device for detecting errors of the servo motor of the recorder and/or playback for recording data on a disk and reproducing data from a disk in a data region which recorded the reference samples have the same size, where the device includes: a detector that identifies the first value of the reference samples, recorded at least at two positions separated from each other, and the second value of the playback signal corresponding to the reference samples, and a comparator that determine the screen separates the error of a servo motor by using the first value and the second value.

The signal quality is significantly degraded because of an error of the servo motor, such as slope and care of the disc as the recording density becomes higher, not only in the disk used only for playback, such as a DVD-ROM, but also in recordable disc, such as DVD-RAM. E. particular, in recordable disc, the recording quality deteriorates due to the influence of schipke servo motor in the presence of schipke servo during recording, and the deterioration of the signal quality becomes serious due to the error of the servo motor during playback of any given part.

In the DVD-RAM information is recorded on the track record. The track consists of track and field track grooves of the record. Track field and the track grooves alternate with one revolution of the disk. Track field and the track grooves played in the DVD-RAM disc to provide a guide route in the initial stage and reduce cross distortion between adjacent tracks in a narrow path high density.

The track consists of sectors that have a uniform length. Pre-embossed area of the header is provided during manufacture of the disk as a means of physical separation sectors. Physical sector numbers recorded in the pre-embossed area of the header.

Each sector consists of a header area in which the recorded physical data is automatically recognized (BFI), and the field data.

Figa shows the physical shape of the track field in the DVD-RAM disc. Figv shows the out-of-phase signal in the track field.

The header area is re-located in each sector of the track. Four BFI (DFI-DFI)having the same value written in one of the header area. DFI and DFI are arranged in such a way as to deviate from the middle of the track for some distance, and DFI and DFI are arranged in such a way as to deviate from the middle of the track in the opposite direction DFI and DFI, so that BFI could be read correctly even if the laser spot 22 deviates from the middle of the track. Location DFI and DFI and DFI and DFI in the track field is also opposite to their locations in the track grooves. Antiphase signal shown in figv may be received in the track field.

Figa shows the physical shape of the track groove in the DVD-RAM disc. Figv shows the out-of-phase signal in the track grooves.

Figure 3 shows an enlarged region of the header shown in figa-2A. In the structure of the header area, DFI and DFI and DFI and DFI are arranged in such a way as to deviate from the middle of the track in opposite directions at a uniform value. The signal of the tunable oscillator (vfo)that have the specified frequency for the synchro is Itachi and detection identification, and the signal identification (ID), showing physical addresses of the sectors are recorded in the respective BFI. The tunable signal generator has the structure of a recording 4T (T - trigger period).

As shown in figure 3, the header area consists of vfo1 33 and ID1 (DFI) 34, vfo2 35 and ID2 (DFI) 36, 37 and vfo3 ID3 (DFI) 38, and vfo4 39 and ID4 (DFI) 40. In figure 3, with the passage of the laser spot through the header area of the track grooves, obtained antiphase signalshown in figa, and the total signalshown in figv. On figa, the vfo1 signal 42 corresponds to the region of the vfo1 signal 33 figure 3. The vfo3 signal 43 corresponds to the area vfo3 signal 37.

Figure 5 shows the design of the device for obtaining out-of-phase signal shown in figa, and the total signal, shown in figv. Figure 5 the reference numeral 50 denotes a photodetector divided into four sections. Reference numerals 52 and 54 denote adders. Reference numeral 56 denotes a computer.

The device shown in figure 5, produces a signal RF_sum the sum of the signals of the detected light receiving elements A to D of the photodetector divided into four parts, the total signals V1 and V2 of the radial pairs b and C, and a and D of the respective light receiving elements and the opposite phase signalthat is, C is cash subtracting V2-V1 signals V1 and V2.

Figure 10 shows the standard technology of tilt compensation and method of detecting the amount of tilt by using specific patterns recorded on the track of the disk. This specific structure coincides with the direction of the continuation of the track and the middle of the track and is implemented in the form of reference Pete (microglobuline) and/or reference Pete C.

You can get information about the slope by comparing the signals reproduced from reference samples, shown in figure 10, with each other and thus to control compensates for the tilt of the equipment according to the obtained information about the slope or offset these signals by changing the coefficient of the equalizer playback signal.

The reference samples is shown in figure 10, are placed in an arbitrary position on the disk and are used to detect a tangential tilt (tilt in the direction of the track).

However, in the conventional technology shown in figure 10, the length of the reference sample for detection of inclination is too small. To detect the correct position of the structure of tilt needed another sample. Also radial tilt (the tilt in the radial direction) can be detected. Since, in practice, the radial tilt is greater than the tangential tilt, these reference samples are not as PR is applicable.

Since it is necessary to precisely control a servo device for recording/playback to maintain the optimum condition record/playback, you need to control the error signal of the servo motor with high resolution.

However, the accuracy of the error signal of the servo motor is changed depending on the disc or playback device. Thus, it is difficult to precisely control the servo motor.

A BRIEF STATEMENT of the substance of the INVENTION

To solve the above objectives the first objective of this invention is the provision of a device for recording data on the disk and/or reproducing data from a disk in which a recording area is divided into sectors, each sector has a header indicating the address, with each header has a first header and a second header that is written in such a way as to deviate from the middle of the track in opposite directions, and the first header and the second header are the address region in which the recorded signals of the addresses of the sectors and the field of the synchronous signals, which are recorded synchronous signals, the detection signals of the address containing the signal generator play, including a photodetector having a radial pairs of detecting elements, which generates a playback signal, which includes the total signals V 1or V2radial pairs of detecting elements, the total signalthe detecting elements, the antiphase signalthe detecting elements of the optical signal reflected from the disk, the detector header to generate a signal field of the header contains the header area of the playback signal received from the generator of the playback signal, the level detector of the first synchronous signal, which receives the playback signal from the generator of the playback signal and carries out the detection of the first magnitude Lvfo1 first synchronous signal in the first title, with the specified level detector of the first synchronous signal is synchronized with the signal of the header received from the detector header area, the level detector of the second synchronous signal, which receives the playback signal from the generator of the playback signal and provides the second detection value Lvfo3 second synchronous signal in the second header, and is synchronized with the signal of the header received from the detector header area, and the evaluator balance for calculating the carrying values of K1values Lvfo1 first synchronous signal detected using the detector the level of the first synchronous signal and the magnitude Lvfo3 second synchronous signal, detected by the level detector of the second synchronous signal. The device further comprises a comparator for comparing the carrying value of K1computed by the evaluator balance with a reference value of Kaboutand outputting the difference of the Ktbetween the carrying value of K1and the reference value of Kabout. And the reference value of Kaboutrepresents the carrying value measured in the regulated reference condition. In addition, this CD contains the track field and the track grooves and wobulation to separate the paths of the field from the track grooves, thus the value of leaving the track is determined based on the magnitude of the signal changes lobularia generated by lobularia in the radial direction. While the evaluator balance determines the carrying value of K1as

(Lvfo1 Lvfo3)/(Lvfo1+Lvfo3).

In addition, this CD contains the track field and the track grooves and the device further comprises a polarity inverter for inverting the polarity of the difference Ktin accordance with the track field/grooves, and also contains the detector field/grooves receiving the playback signal, provided by signal generator playback, detects the track field/grooves for the formation of the detection, and transmits the result of detection in invert the polarity. In addition, the device further comprises a tilt controller for controlling the inclination of the disk in accordance with the output signal of the inverter polarity. While the level detector of the first synchronous signal and the level detector of the second synchronous signal detects the first and second values of the first and second synchronous signals, respectively, from out-of-phase signalgenerated by the generator of the playback signal and the reference value of Kaboutis the carrying amount measured in the absence of the inclination of the disk. In addition, the device further comprises a controller sequence to compensate for leaving the track of the disk according to the output signal of the inverter polarity. The reference value of Kaboutaccording to the first aspect of the invention is the carrying amount measured in the absence of leaving the track.

In addition, the level detector of the first synchronous signal and the level detector of the second synchronous signal to carry out the detection of the first and second values of the first and second synchronous signals, respectively, from the total signalgenerated by the signal generator playback. The device further comprises a signal generator region of the reflector, which generates signals the region of the reflector, specifying the area of the reflector from the total signalin the playback signal provided by the generator of the playback signal, and the detector signal reflector receives the total signalin the playback signal, provided by signal generator playback and detects the signal level region of the reflector, and is synchronized with the signal region of the reflector formed by the signal generator region of the reflector, and the evaluator balance determines the carrying value of K1based on the first value Lvfo1 first synchronous signal, which is detected by the level detector of the first synchronous signal and the second value Lvfo3 second synchronous signal, which is detected by the level detector of the second synchronous signal level of the signal reflector, and the evaluator balance determines the carrying value of K1as Lvfo1-Lvfo3)/L0. According to the second aspect of the invention provides a device for detecting errors of inclination of the playback device data from the optical disk in accordance with a signalobtained by subtracting having a first reference signal and second reference signal, which is recorded thus the om, to deviate from the middle of the track in opposite directions, and which have the same sample, where the device includes: a detector for determining the first level Lvfo1 first reference signal and the second level Lvfo3 second reference signal from a signalobtained by subtracting reproduced from the optical disk, a comparator to determine the carrying values of K1in accordance with the following equation:

K1=(Lvfo1 Lvfo3)/(Lvfo1+Lvfo3),

and error detection of inclination in accordance with a carrying value of K1.

In the device the disc is divided into sectors having a preset length on the track, with each sector contains the first and second reference signals, and the comparator detects a failure of the slope by averaging the carrying values obtained from adjacent sectors.

BRIEF DESCRIPTION of DRAWINGS

The above-mentioned objectives and advantages of this invention will become more apparent by a detailed description of its preferred option, with reference to the accompanying drawings, in which:

Figa shows the physical shape of the track field;

Figv shows the out-of-phase signal in the track field;

Figa shows the physical shape of the track groove;

Figv shows the form antiphase with the persecuted in the track grooves;

Figure 3 shows an enlarged region of the header shown in figa and 2A;

Figa and 4B show anti-phase signal and the total signal obtained by passing the laser spot through the header area of the track grooves figure 3;

Figure 5 shows the design of the device for receiving the playback signal, shown in figure 4;

6 is a block diagram showing a construction variant of the device for detecting errors of the servo motor in accordance with this invention;

Figa-7E show waveforms during operation of the device shown in Fig.6;

Fig is a block diagram showing the construction of another embodiment of a device for detecting errors of the servo motor in accordance with this invention;

Figa-9B shows waveforms during operation of the device shown in Fig;

Figure 10 shows the standard technology for the correction of inclination;

11 is a graph showing the relation between the radial tilt and the carrying value To the method and device in accordance with this invention; and

Fig is a graph showing the relation between leaving the track and the carrying value To the method and device in accordance with this invention.

Description of the PREFERRED OPTIONS

Next to the construction and operation of this invention will be described in detail with reference to the accompanying drawings.

For example, in an anti-phase signal ratio of the magnitude of the signal DFI and DFI to the magnitude of the signal DFI and DFI varies up to 30%, depending on the disc. When using this signal as a reference signal to control the servo motor, it is difficult to control the servo motor and to maintain an optimal state of recording/playback.

In the method of detecting errors of the servo motor in accordance with this invention, the error of the servo motor is detected by the ratio of the magnitude of the reference samples, regularly recorded on the disk, to the value of the playback signal corresponding to this reference samples.

Reference samples could include synchronous signal recorded in the header area, and the signal lobularia recorded in the track direction of the disk.

First will be described a method of detecting errors of the servo motor uses a synchronous signal recorded in the header area. In the case where the optical axis of the laser spot relative to the vertical header area, namely, when the tilt in the radial direction of the missing value (Lvfo1) program vfo1 signal is approximately equal to the value (Lvfo3) vfo3 signal. However, in the case where the tilt or leaving the track takes place, or when Lvfol, or Lvfo3 becomes large, the second of them becomes small the M.

This is due to the fact that the intensity of light reflected from DFI and DFI and DFI and DFI, which are arranged in such a way that they deviate from the middle of the track in opposite directions, the same relative inclination of the disk, while the light spot follows the middle of the track. When the disc is tilted in the inner side of the intensity of light reflected from the top of the header (header level) is greater than the intensity of light reflected from the bottom of the header (header bottom border), as shown in figa-2A.

Thus, the ratio of the magnitude of Lvfo1 vfo1 signal to the magnitude of the Lvfo3 vfo3 signal changes. Also the ratio of the magnitude of Lvfo2 signal vfo2 to the magnitude of the Lvfo4 signal vfo4 changes.

In order to detect the degree to which changes the ratio of these values, you should use the signal recorded at a uniform level. Since the vfo signals have uniform levels and frequency, vfo signals are suitable for this purpose. It is also easier to detect the magnitude of the signals vfo1 and vfo3 than the magnitude of the signals vfo2 and vfo4.

Here, when the values of the synchronous signals detected in the areas of vfo1 and vfo3 are Lvfo1 and Lvfo3, the carrying value of K is defined as follows:

or

where Lo is the value of the total signal is and RF_sum in the area of the reflector.

In equations 1 and 2, the carrying value is calculated using the value of the synchronous signals detected from areas vfo1 and vfo3. Although it is possible to calculate the carrying value using the value of the synchronous signals detected from areas vfo2 and vfo4, it is easier to detect synchronous signals of the areas vfo1 and vfo3 than from areas vfo2 and vfo4. Also, you can use the value obtained by combining synchronous signals detected in the areas of vfo1 and vfo2, and the value obtained by combining synchronous signals detected in the vfo3 areas and vfo4.

When the carrying value obtained in the absence of errors of the servo motor is Toaboutand the carrying value obtained in the case of the existence of errors of the servo motor is the K1the difference between these two values is defined as follows:

Namely, it is possible to learn the direction and magnitude of error of the servo motor according to the magnitude and sign To at.

Here To you may be a value measured in a state where there is no fault of the servo motor, the default variable determined by the system controller device recording/playback, or the value measured in the reference state defined by system.

In the track field and the track grooves of the polarity of K1 must change in order to properly calculate the K1since the position DFI and DFI and position DFI and DFI are converted.

Now will be described a method of detecting errors of the servo motor drive using signal lobularia. Lobularia is formed in the track field and the track grooves in the DVD-RAM disc. Lobularia has the shape of a sine wave, formed on the side wall of the track. When the disc is tilted in the radial direction, the signal lobularia tilted in the radial direction. Namely, the signal value of lobularia changes between two arbitrary points, separated from each other in the radial direction. Thus, it is possible to detect the tilt by detecting the magnitude of the signal changes lobularia in the radial direction.

6 is a block diagram showing a preferred design variant of the device for detecting the error signal of the servo motor in accordance with this invention. The device, shown in Fig.6, includes a signal generator playback 62, the detector 64 of the header area, the detector 66 level of the first synchronous signal detector 68 of the second synchronous signal, the evaluator balance 70, the comparator 72, the detector 76 field/grooves, the tilt controller 74, the polarity inverter 78 and the compensator 80 leaving the track.

Generator is 62 playback signal to generate a summed signal total signals V1 and V2 of the radial pairs and opposite phase signalobtained by subtracting V1 and V2. The generator 62 playback signal includes a photodetector divided into four parts, and the transmitter, as shown in figure 5.

The detector 64 header generates signals header (signal 1 the header and signal 2 of the header area), showing the header area of the playback signal. Here, the signal 1 the header area notes area DFI and DFI. Signal 2 header area notes area DFI and DFI. Because the header area has an envelope larger envelope than the field data, you can get a signal in the header area, showing the header area, using as an envelope detector for detecting the envelope of the playback signal, and comparator.

The detector 66 level of the first synchronous signal synchronized with the signal 1 header generated by the detector 64 header, detects the amount Lvfo1 vfo1 signal, shown in figure 4. More precisely, the generated first signal preparation (preparation 1)having a given width and separated from the start point signal 1 header given distance. After the selection of the playback signal, the first signal preparation (preparation 1), Lvfo1 vfo1 signal is detected by detecting the magnitude of the double amplitude (magnitude) of the playback signal.

The detector 68 of the second synchronous signal synchronized with the signal 2 header generated by the detector 64 header, detects the magnitude of the signal vfo3, shown in figure 4. More precisely, the value of JLvfo3 vfo3 signal is detected by generating the second signal preparation (preparation 2)with the specified width and separated from the starting point of the signal 2 header, selection (Gating) of the playback signal through the second signal preparation (preparation 2) and the detecting scope strobirovaniya playback signal.

The transmitter 70 balance calculates the ratio of the magnitude of Lvfo1 vfo1 signal, detected by the detector 66 level of the first synchronous signal to the magnitude of the Lvfo3 vfo3 signal, detected by the detector 68 of the second synchronous signal, as shown in equation 1. Here the transmitter 70 balance can produce an average value the carrying values obtained from several consecutive sectors in the radial or tangential direction.

The comparator 72 compares the carrying value of K1calculated by the calculator 70 balance, with a given reference value of Kaboutand outputs the difference between the two values atas shown in equation 3. Hereaboutmay be a value measured in a state where there is no tilt, prinimaemogo default value determined by the system controller device recording/playback, or the value measured in the reference state defined by system.

The detector 76 field/groove receives the playback signal and detects whether the current track track field or track grooves. In an anti-phase signal paths field value DFI and DFI less than the amount DFI and DFI, as shown in figv. In an anti-phase signal of the track grooves value DFI and DFI less than the amount DFI and DFI. The detector 76 field/groove distinguished track field from the track groove with use of the above.

The polarity inverter 78 inverts the polarity of the value of subtracting the Ktissued from the comparator 72, in accordance with the result detektivami detector 76 field/grooves.

Carrying value may be used to compensate for the tilt.

The controller 74 of the tilt adjusts the tilt of the disk in accordance with the magnitude of the subtraction To at, the polarity of which is inverted, and which is output from the polarity inverter 78. Since the sign and magnitude of the value of the subtraction To atshow the direction and magnitude of tilt, the tilt of the disk is regulated by filing in the feedback loop of the sign and the value of the subtraction To at.

Carrying value may be used for the correction of care is to the tracks.

The compensator 80 leaving the track, regulates leaving the track of the disk according to the value of the subtraction To at, the polarity of which is inverted and which is output from the polarity inverter 78. Since the sign and magnitude of the value subtracting the Ktshow the direction and magnitude of departure from the track, leaving the track of the disk is regulated by filing in the feedback loop of the values of the subtraction To at.

7 shows waveforms of operation of the device shown in Fig.6. Figa shows the opposite phase of the signal generated by the generator 62 of the playback signal. Figv and 7C show waveforms 1 the header and signal 2 header, respectively, generated by the detector of the header area. Fig.7D and 7E show the shape of the first signal preparation (preparation 1) and the second signal preparation (preparation 2), used by the detector 66 level of the first synchronous signal and the detector 68 of the second synchronous signal.

Fig is a block diagram showing the construction of another embodiment of the device for generating the error signal of the servo motor in accordance with this invention. The device shown in Fig, like the device shown in Fig.6, except that the device includes a generator 86 of the signal region of the reflector and the detector 88 level of the I signal reflector. Thus, the same reference numerals are used for the same elements, and their detailed description is omitted.

Generator 86 of the signal region of the reflector generates a signal region of the reflector, showing the area of the reflector, from the total signalprovided by generator 62 of the playback signal. In an anti-phase signalsince the signal reflector becomes zero, it is impossible to receive the signal region of the reflector through out-of-phase signal RF_pp.

You can generate the signal region of the reflector by means of the envelope detector and comparator, the signal reflector has a much lower envelope than the signals of the data area and the header area.

The detector 88 level signal reflector detects the signal level of the reflector of the total signalusing the signal region of the reflector generated by the generator 86 of the signal region of the reflector. The detector 88 level signal reflector generates a third signal preparation (preparation 3), having a given period by a signal region of the reflector is generated by the signal generator region of the reflector, gates summed signal RF_sum through third signal processing (preparation 3) and detects the magnitude of the construction of the new total signal RF_sum.

The transmitter 72 balance evaluates the carrying value of K1as shown in equation 2 using the level Lvfo1 vfo1 signal, detected by the detector 66 level of the first synchronous signal level Lvfo3 vfo3 signal, detected by the detector 68 of the second synchronous signal, and the signal level of the reflector Lo, detected by the detector 88 level signal reflector. Here the evaluator balance 72 may give the average value the carrying values obtained from several consecutive sectors in the radial or tangential direction.

Figa and 9B show waveforms during operation of the device shown in Fig. Figa shows the waveform area of the reflector, issued from the generator 86 of the signal region of the reflector. Figv shows a shape of the third signal preparation (preparation 3).

In accordance with this invention, can be used out-of-phase signaltotal signals V1 and V2 of the radial pairs and the total signalto detect errors of the servo motor, as the error of the servo motor by the carrying value of the synchronous signals. For example, when using an opposite phase signalyou can compensate for the tilt in the radial direction. When you use sum is ary signal you can compensate for the tilt in the tangential direction.

11 is a graph showing the relation between the radial tilt and the carrying value To the method and device in accordance with this invention. Figure 11, the horizontal axis indicates the radial tilt and the vertical axis denotes the carrying values of K. figure 11 graph marked ▴shows the case where we used the total signaland the carrying value according to equation 1. The graph marked withshows the case where we used the total signaland the carrying value according to equation 2. The graph marked •shows the case where used antiphase signaland the carrying value according to equation 2. The graph marked ▪shows the case where used antiphase signaland the carrying value according to equation 1.

As shown in figure 11, the radial tilt best describes the occasion marked ▪using antiphase signaland the carrying value according to equation 1. Case, marked •using antiphase signal and the carrying value according to equation 2, is also useful for describing the radial tilt.

Thus, it is possible to determine the slope values in accordance with equations 1 and 2 using out-of-phase signal.

Fig is a graph showing the relation between leaving the track and the carrying value in the method and device in accordance with this invention. On Fig the horizontal axis denotes the value of leaving the track. The vertical axis indicates the carrying value of K. In Fig graph, marked ▴shows the case where we used the total signaland the carrying value according to equation 1. The graph marked withshows the case where we used the total signaland the carrying value according to equation 2. The graph marked •shows the case where used antiphase signaland the carrying value according to equation 2. The graph marked ▪shows the case where used antiphase signaland the carrying value according to equation 1.

As shown in Fig, schedule, marked ▴shows the case where the total signal and the carrying value according to equation 1 are most affected by leaving the track. The graph marked ▪shows the case where the anti-phase signaland the carrying value according to equation 1 in the least degree affected by leaving the track.

Consequently, it is possible to determine leaving the track value according to equation 1 or 2 using the total signal.

As shown in 11 and 12, can most effectively be used to detect the amount of tilt when using out-of-phase signaland the carrying value in accordance with equation 1.

The quality of the error signal of the servo motor is changed in accordance with the quality of the disc and the system status. However, when the magnitude of the error signal of the servo motor is not limited to a certain extent, it is impossible to recognize BFI or difficult to stably control the servo motor. Therefore, in the disk size Toaboutpreferably regulated so as to maintain the specified level.

Thus, in this invention it is proposed that the value of Kowas limited to the value of 0.1. This value is required for normal playback BFI at a predetermined standard value tilt 0,35. Also take into account the range of amendments (tolerance) Dor the LCD control.

It is also necessary to restrict the value of Ktto a value not exceeding a specified amount, in order to accurately adjust the servomotor device for reproducing data from a disk. In the absence of strict quality control of the servo motor when the playback data is impossible to obtain information BFI.

Thus, in this invention it is proposed that the value of Ktwas limited to the value of 0.1 in control playback device.

It is possible to correctly detect the condition of the inclination of the disk with no specific pattern for detecting errors of the servo motor by means of a method for detecting errors of the servo motor in accordance with this invention.

The recorder/playback can stably control the servo motor and to maintain an optimal state of recording/playback, because the device generating the error signal of the servo motor in accordance with this invention correctly detects the error status of the servo drive.

The recorder/playback can stably control the servo motor and to maintain an optimal state of recording/playback, since it is possible to strictly control the level of the error signal of the servo motor, which is the basis of the control of the servo motor di the com in accordance with this invention.

1. A device for recording data on the disk and/or reproducing data from a disk in which a recording area is divided into sectors, each sector has a header indicating the address, with each header has a first header and a second header that is written in such a way as to deviate from the middle of the track in opposite directions, and the first header and the second header are the address region in which the recorded signals of the addresses of the sectors and the field of the synchronous signals, which are recorded synchronous signals for detecting the address signals, comprising: a signal generator play, including a photodetector having a radial pairs of the detecting elements that generates a playback signal, which includes the total signals V1or V2radial pairs of detecting elements, the total signalthe detecting elements, the antiphase signalthe detecting elements of the optical signal reflected from the disk, the detector header to generate a signal field of the header contains the header area of the playback signal received from the generator of the playback signal, the level detector of the first synchronous signal, which receives the playback signal from the signal generator is and play, and carries out detection of the first magnitude Lvfo1 first synchronous signal in the first header, when the specified detection level of the first synchronous signal is synchronized with the signal of the header received from the detector header area, the level detector of the second synchronous signal, which receives the playback signal from the generator of the playback signal and provides the second detection value Lvfo3 second synchronous signal in the second header, and is synchronized with the signal of the header received from the detector header area, and the evaluator balance for calculating the carrying values of K1values Lvfo1 first synchronous signal detected using the detector of the level of the first synchronous signal and the magnitude Lvfo3 second synchronous signal detected by the level detector of the second synchronous signal.

2. The device according to claim 1, characterized in that it further comprises a comparator for comparing the carrying value of K1computed by the evaluator balance with a reference value of K0and outputting the difference of Kt between the carrying value of K1and the reference value of K0.

3. The device according to claim 2, characterized in that the reference value of K0represents the carrying value measured in the regulated reference condition.

4. The device according to claim 3, characterized in that the drive specified with the contains the track field and the track grooves and wobulation to separate the paths of the field from the track groove, thus the value of leaving the track is determined based on the magnitude of the signal changes lobularia generated by lobularia in the radial direction.

5. The device according to claim 2, characterized in that the evaluator balance determines the carrying value of K1as (Lvfo1-Lvfo3)/(Lvfo1+Lvfo3).

6. The device according to claim 2, characterized in that the disk contains the track field and the track grooves and the device further comprises a polarity inverter for inverting the polarity of the difference Kt in accordance with the track field/grooves.

7. The device according to claim 6, characterized in that it further comprises a detector field/grooves receiving the playback signal, provided by signal generator playback, detects the track field/grooves for the formation of the detection, and transmits the result of detection in the inverter polarity.

8. The device according to claim 7, characterized in that it further comprises a tilt controller for controlling the inclination of the disk in accordance with the output signal of the inverter polarity.

9. The device according to claim 1, characterized in that the detection level of the first synchronous signal and the level detector of the second synchronous signal detects the first and second values of the first and second synchronous signals respectively from the opposite phase signalgenerated by signal generator playback.

10. The device according to claim 8, characterized in that the reference value of K0is the carrying amount measured in the absence of the inclination of the disk.

11. The device according to claim 7, characterized in that it further comprises a sequence controller to compensate for leaving the track of the disk according to the output signal of the inverter polarity.

12. The device according to claim 11, characterized in that the reference value of K0is the carrying amount measured in the absence of leaving the track.

13. The device according to claim 1, characterized in that the detection level of the first synchronous signal and the level detector of the second synchronous signal to carry out the detection of the first and second values of the first and second synchronous signals, respectively, from the total signalgenerated by the signal generator playback.

14. The device according to claim 2, characterized in that it further comprises a signal generator region of the reflector, which generates a signal region of the reflector, specifying the area of the reflector from the total signalin the playback signal, provided by signal generator playback, and the detector signal reflector receives the total signalin the playback signal, provided through the m generator of the playback signal and detects the signal level region of the reflector, and is synchronized with the signal region of the reflector formed by the signal generator region of the reflector, and the evaluator balance determines the carrying value of K1based on the first value Lvfo1 first synchronous signal, which is detected by the level detector of the first synchronous signal and the second value Lvfo3 second synchronous signal, which is detected by the level detector of the second synchronous signal level of the signal reflector.

15. The device according to 14, characterized in that the evaluator balance determines the carrying value of K1as (Lvfo1-Lvfo3)/L0where L0- the value of the total signalin the area of the reflector.

16. A device for detecting errors of inclination of the playback device data from the optical disk in accordance with a signalobtained by subtracting having a first reference signal and second reference signal, which is recorded in such a way as to deviate from the middle of the track in opposite directions, and which have the same sample, where the device includes: a detector for determining the first level Lvfo1 first reference signal and the second level Lvfo3 second reference signal of opposite phase signalin proizvedennoe from the optical disk, a comparator to determine the carrying values of K1in accordance with the following equation: K1=(Lvfo1-Lvfo3)/(Lvfo1+Lvfo3), and determine the error of inclination in accordance with a carrying value of K1.

17. The device according to item 16, characterized in that the disk is divided into sectors having a preset length on the track, with each sector contains the first and second reference signals, and the comparator detects a failure of the slope by averaging the carrying values obtained from adjacent sectors.



 

Same patents:

The invention relates to optical instruments, namely, devices for automatic focus when printing, photolithography and fabrication of photomasks by scanning laser writing

The invention relates to optical systems and, in particular, to search using the optical head in the optical system

The invention relates to the field of optical instrumentation and can be used in the systems of recording and reading optical information

The invention relates to the field of optical instrumentation and can be used in the systems of recording and reading optical information

The invention relates to optical recording and playback

The invention relates to optical recording and can be used for high-speed recording, playback and store large amounts of information

The invention relates to devices designed for recording and reproducing information on the recording media, representing the disc, card or tape

The invention relates to the field of recording and reproducing information on optical disks

The invention relates to the making, in particular to systems optical recording and/or reproduction of information, and can be used as an external computer storage devices and measuring systems for various purposes, in which the measured value is represented in the form of repetitive increments

FIELD: optical discs.

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

EFFECT: higher efficiency.

2 cl, 15 dwg

FIELD: optical record/play devices.

SUBSTANCE: data area on disc is divided into sectors. Each sector header has first header and second header, recorded in a way to deflect from track middle in opposite directions. Said first and second headers have address areas, wherein sectors address signals and synchronous signals areas are recorded, wherein synchronous signals for detecting address signals are recorded. First value of synchronous clock signal is detected from first header and is a Lvfo1. second value of synchronous clock signal is detected from second header and is a Lvfo3. relation of first value Lvfo1 to second value Lvfo3 is a previously set limited value.

EFFECT: higher precision of error detection.

7 cl, 15 dwg

FIELD: optical data carriers.

SUBSTANCE: method includes focusing main and auxiliary laser emission beams on working surface, continuous determining of distance to recording point and correcting of main laser focus accordingly to change of distance from recording point. Determining space from recording point is performed during space combination of optical paths of two falling beams, with measurement of alteration of energy distribution of auxiliary reflected beam in registration plane due to forming of astigmatism of reflected beam.

EFFECT: higher quality, higher precision, higher efficiency.

3 cl, 3 dwg

FIELD: optical data carriers.

SUBSTANCE: from optical disk, on which standard samples of similar length are recorded in a way to deviate from middle of track in opposite directions, signals are reproduced, which are detected from standard samples. On basis of determined values of detected signals value of balance value is determined, on basis of which servo error is detected. As standard samples, "vfo" template signals recorded on disk can be used. Values of balanced values, received for adjoining sectors, can be brought to average. Balance value for detection of incline error can be determined on basis of subtraction signal RF_pp, which is signal of subtraction V2-V1, where V1, V2 - signals from radial couples of photo-detector.

EFFECT: more stable servo control, maintained optimal state for recording and reproduction.

11 cl, 15 dwg

FIELD: optical data carriers.

SUBSTANCE: from optical disk, on which standard samples of similar length are recorded in a way to deviate from middle of track in opposite directions, signals are reproduced, which are detected from standard samples. On basis of determined values of detected signals value of balance value is determined, on basis of which servo error is detected. As standard samples, "vfo" template signals recorded on disk can be used. Values of balanced values, received for adjoining sectors, can be brought to average. Balance value for detection of incline error can be determined on basis of subtraction signal RF_pp, which is signal of subtraction V2-V1, where V1, V2 - signals from radial couples of photo-detector.

EFFECT: more stable servo control, maintained optimal state for recording and reproduction.

11 cl, 15 dwg

FIELD: optical data carriers.

SUBSTANCE: optical scanning device for information carrier has emission source, collimator lens assembly, objective lens assembly and drive for moving assembly of collimator lens, drive has moving and immovable portions, movement of which relatively to each other is limited, while immovable and moving portions of drive are in the same magnetic circuit, having immovable magnetizable portion contained in moving portion of drive, aforementioned first and second positions of which are balanced positions. Device is made with possible control by means of adjustment of electric current by interaction between electromagnetic field of inductiveness coil and magnetic field of constant magnet.

EFFECT: possible production of reliable and functional drive for moving collimator assembly.

2 cl, 5 dwg

FIELD: focus adjustment devices, possible use in devices for recording/reproducing optical disks.

SUBSTANCE: focus adjusting device is used for focusing the light emitted by light source onto recording layer of optical disk by means of an objective, wherein the zone of coverage to achieve focusing is determined from the following: lower boundary is determined on the basis of average length of impulse series; and upper boundary is determined on basis of optical disk track step.

EFFECT: increased focusing precision.

5 cl, 13 dwg

FIELD: physics, computer engineering.

SUBSTANCE: according to the present invention device for optical disk is arranged with the possibility to read data from optical disk having multiple layers of information record, including the first layer of information record, distance of which from disk surface is relatively small, and the second layer of information record, distance of which from disk surface is relatively large. This device on optical disk comprises the following: section of focus adjustment that stipulates for location of light beam convergence point on randomly selected layer of information record of optical disk; section of tracking that stipulates for location of light beam convergence point on previously specified path of information record layer; and section for specification of amplification ratio arranged with the possibility to modify amplitude-frequency characteristic of at least one from focus adjustment section and tracking section. Section of amplification ratio switching sets cutoff frequency value in advance (frequency, at which amplification ratio is equal to 0 dB), when reading data from the first layer of information record by less than value of cutoff frequency in process of data reading from the second layer of information record.

EFFECT: provision of possibility to read data from optical disk having multiple layers of information record, including the first layer of information record, distance of which from disk surface is relatively small, and the second layer of information record, distance of which from disk surface is relatively large.

10 cl, 9 dwg

Up!