Way to move the optical head when searching for a track on the storage medium and the device for implementing the method (variants)

 

(57) Abstract:

The invention relates to optical systems and, in particular, to search using the optical head in the optical system. The claimed method of moving an optical head from an initial track to the target track on the information carrier. Is determined by the total number of paths that need to cross, and the optical head is moved to the specified track. Measured value of the reflectance of light from the information carrier, and in accordance with the signal of the tracking error. The error signal tracking has indicators both true and false intersections of the track. In response to the values of the reflection coefficient of the signal indicator data indicator having the points associated with indicators of false crossings of the track. The number of counted tracks increases for each indicator of the true intersection of the paths, and the optical head is stopped when the number of counted tracks becomes equal to the total number of paths that need to cross. Stated another variant of the method, according to which the signal of the counting of tracks is generated from the error signal of the tracking and signal indicator data. C the horns in the error signal tracking. The claimed device, comprising a sensor for measuring the coefficient of reflection light from the information carrier, the signal generator error tracking to generate the error signal of the tracking preamplifier to generate a data signal, the signal generator crossing paths, responsive to the error signal of the tracking, and the selector States track/lock, responsive to the data signal and causing the signal generator of intersection of the paths to generate the signal crossing the tracks without indicator false crossing paths on the basis of the error signal tracking. The technical result is an efficient way of finding the desired track. 9 C. and 3 h.p. f-crystals, 7 Il.

The invention relates to optical systems and, in particular, to search using the optical head in the optical system. More specifically, but without limitation, specific embodiments of the invention described below in accordance with the best way of implementing this invention relates to the implementation of the counting intersections of paths.

Certain types of media have constant levels of reflectivity in the areas of data storage. Distinguishing the recorded data can be Khujand is, the example of the headers can have different levels of reflectivity.

In the process of searching from one track to another, is determined by the number of intersections of paths. The number of crossings of the tracks shows the number of tracks that must be crossed when searching from the initial track to the target track. When searching monitored current result of counting the crossings of tracks indicating the number of tracks crossed at this point. When the current result of counting the crossings of paths becomes equal to a specific number of crossings of the tracks, the search ends and achieved the specified path.

In the systems known from the prior art, the current result of counting the crossings of the tracks could be derived from the error signal of the tracking. However, if the search path crosses the field with different levels of reflectivity, the error signal tracking can lead to erroneous indication of crossing tracks. Therefore, if the current result of counting the crossings of tracks based on the error signal of the tracking, it would be equal to the number of crossings of the tracks earlier than would have been achieved given the path that would lead the tion.

The purpose of the present invention, more particularly describing the invention and its advantages will be clear from the following description of a preferred variant embodiment of the invention illustrated by the drawings, which represent the following:

Fig. 1 is a generalized representation of the media intended for use in the invention

Fig. 2 is a magnified image of a portion of the information carrier shown in Fig.1,

Fig. 3 is a generalized representation of the media intended for use in the invention, illustrating the path traversed by the optical head in the search process,

Fig.4 is a generalized representation of one of the embodiments of the invention,

Fig. 5 - generalized graphs of waveforms generated in one of the embodiments of the invention,

Fig.6 is a generalized view of another embodiment for carrying out the invention

Fig. 7 - generalized graphs of waveforms generated in another embodiment of the invention.

Below is described a method of moving an optical head from an initial track to the target track on the storage media that contains data that is arranged on its Doro specified track. Measured value of the reflectance of light from the media, and the error signal tracking is produced in accordance with the measured value. The error signal of the tracking contains indicators both true and false intersections of paths. The error signal tracking has the zero-crossing of the first type corresponding to the intersection of the optical head of one of the tracks, and the zero-crossing of the second type corresponding to changes in the value of the reflection coefficient in response to the data or increase the frequency of changes in the values of the reflection coefficient. Based on the value of the reflection coefficient of the signal indicator data indicator having the points associated with indicators of false crossings of the track. One alternative embodiment of the invention includes passing the level of the reflection coefficient through the high-pass filter for receiving the signal of the indicator data, where the signal form of the indicator data indicator has a point corresponding to the zero crossing of the second type. The number of counted tracks increases for each indicator of the true intersection of the paths, and the optical head is stopped when the number of podrazumevane of the invention is used to generate signal counting paths from the error signal of the tracking and signal indicator data the signal count of the tracks has a point of intersection of the paths corresponding to the zero crossing of the first type. Another option implementation includes incrementing the number of counted tracks for each zero-crossing and reducing the number of counted tracks for each zero-crossing of the corresponding changes in the values of the reflection coefficient or increase the frequency of changes in the value of the reflection coefficient.

Below is disclosed another method of moving the optical head from an initial track to the target track on the storage media that contains data that is arranged in its tracks. Is determined by the total number of paths that must be crossed, and the optical head is moved to the specified track. Measured value of the reflectance of light from the information carrier, and in accordance with the signal indicator data. The signal data is the indicator points corresponding to changes in the value of the reflection coefficient in response to the data. Conversely, the indicator points correspond to frequency changes in the value of the reflection coefficient. One of the embodiments may ispolzovaniya error signal tracking based on the values of reflection coefficient and signal indicator data. The error signal tracking has the zero-crossing corresponding to the intersection of the optical head of one of the tracks, and the segments of constant amplitude, the corresponding indicator points. The number of counted tracks increases for each zero-crossing. According to another variant embodiment of the invention, generates a signal count of tracks of the error signal tracking. The signal count of the tracks has a point of intersection of the paths corresponding to the zero crossing. The signal count of tracks indicates a crossing of paths corresponding to the indicators of the true cross track error signal of the tracking Movement of the optical head ends when the number of counted tracks becomes equal to the number of crossings of the tracks.

Also the claimed device moving the optical head from an initial track to the target track on the storage media that contains data that is arranged in its tracks, which contains a sensor for measuring the coefficient of reflection light from the information carrier, the signal generator error tracking, responsive to the value of the reflection coefficient, to generate a signal error tracking the data indicates changes in the values of the reflection coefficient in response to the data the signal generator crossing paths, responsive to the error signal tracking to generate a digital signal crossing paths with the zero crossing of the second type corresponding to the zero crossing of the first type, and the selector States track/lock, responsive to the data signal, for issuing a command to the signal generator data block generation zero crossing of the second type, when the data signal indicates a change to the value of the reflection coefficient in response to the data to ensure the generation of the signal crossing lanes without indicators of false crossings of the track from the error signal tracking.

Below discloses another device containing a sensor for measuring the values of the reflection coefficient from the media, preamplifier, responsive to values of the reflection coefficient, to generate a data signal indicating change the value of the reflection coefficient in response to the data generator error tracking, responsive to the value of the reflection coefficient to generate a signal of the tracking error with the zero-crossing of the first type, the selector States track/lock, for issuing a command for generation of the on time interval, when the data signal indicates a change to the value of the reflection coefficient in response to the data, and the signal generator crossing paths, responsive to the error signal tracking to generate a signal crossing paths with the zero-crossing of the second type corresponding to the zero crossing of the first type to indicate crossing the information tracks of the optical head.

In Fig. 1 shows a generalized view of the information carrier 1, intended for use according to the invention. The information carrier 1 has a center 2 and the data recorded on the information tracks 3, representing concentric circles with the center 2. The information tracks 3 can be arranged in a spiral relative to the center 2. In addition, data is organized into sector 4, separated radial (or Nerevarine) headers 5 sectors.

In Fig.2 shows an enlarged image of a fragment of the information carrier 1 according to Fig.1. The area between the tracks 6 are concentrically between successive information tracks 3. Data can be recorded in segments 7, on which information tracks 3 share of sector 4. In addition, these radiology 5 sectors. The data in the headers 8 segments not modified optical system.

In Fig.3 shows a generalized view of the information carrier 1 according to Fig. 1. In addition, the information carrier 1 rotates around the center 2 in the direction shown by the arrow 9. In order to search from the initial information of the track 10 to a desired information track 11, the optical head (not shown) will move along the path 12 relative to the information carrier 1. When moving along the path 12 of the optical head (not shown) will be crossed by radial headers 5 sectors at the point of intersection 13.

In Fig.4 shows a possible variant embodiment of the invention. The device includes a sensor 14 for measuring the values of the coefficient of reflection light from the information carrier 1. The sensor 14 transmits the value of the reflection coefficient on the preamplifier 15. The preamplifier 15 generates a data signal showing the changes in the value of the reflection coefficient in response to the data contained on the information track 3. The preamplifier 15 may include a high pass filter through which the data signal. Then, the preamplifier 15 transmits the data signal to the selector States track/lock 16.

The selector States track/block 16 generates a control signal in response to the data signal. Then, the selector States track/hold 16 transmits the control signal and the error signal of the tracking generator signal crossing the tracks 18. The signal generator crossing paths 18 generates a signal crossing the road is atstumu the error signal tracking. The control signal instructs the signal generator crossing paths to ignore parts of the error signal tracking, the relevant parts of the data signal indicating change the value of the reflection coefficient in response to the data contained on the information track 3. Thus, the signal generator crossing paths 18 generates a signal crossing paths, indicating changes in the values of the reflection coefficient in response to the intersection of the optical head (not shown) of the information track 3.

When the device is searched from the start of the track 10 to the target track 11. Generates the number of intersections of tracks equal to the number of tracks between the track 10 and the target track 11. The optical head (not shown) is moved from an initial track 10 to a given track 11. This variant embodiment of the invention reacts as described above, the light reflected from the information carrier 1, for signal crossing paths. Counter intersections of tracks (not shown) counts the number of changes in the value of the reflection coefficient, indicated by the signal crossing the tracks. When the reference count of the intersections of the paths becomes equal to C the LCD 11.

In Fig. 5 shows the signals generated by the components described above of a variant embodiment of the invention.

Each signal represented in a time-dependent measured on the horizontal axis, with the beginning of the search box on the left and the end of the search on the right. Period of time 19 shows the point where the optical head (not shown) intersects the header 8 segment.

On line 51 shows the error signal of the tracking 20 generated by the signal generator of the tracking error 17. The signal 20 is crossing 21 zero level, indicating that the optical head (not shown) crossed the information track 3. The segment 22 of the signal during the time interval 19 shows that the value of the reflection coefficient is changed in response to the data in the header 8 segment. As the segment 22 of the waveform are crossing 23 the zero level, the error signal of the tracking, if it is not corrected, will generate an erroneous value of the counter crossing the tracks, causing the stop of searching an optical head (not shown) before it reaches the track 11.

On line 52 shows the data signal 24 generated by the preamplifier 15. The signal 24 graphically displays the total value to the connection segment 25 of the signal during the time interval 19, where the data in the header 8 segment can cause changes in the total value of the reflection coefficient. Therefore, the data signal indicates the period of time 19 by means of the segment 25 of the signal.

On line 53 shows the unadjusted signal crossing paths 26 formed by the signal generator crossing paths according to the prior art. The signal 26 is the intersection 27 of the zero level corresponding to the intersections 21 zero error signal, the tracking 20. However, the signal 26 is also the intersection 28 of the zero level corresponding to the zero-crossings of the level 23 of the waveform of the tracking error 20. These zero-crossing 28, however, does not indicate the intersection of the optical head (not shown) of the information track 3. Counter intersections of the tracks are based on the number of zero-crossings of level 27, 28 in the signal generator 26 of the signal crossing the tracks. However, when using a waveform 26 line 53, the counter crossing paths would be inaccurate, as there would be differences between the zero-crossings of level 27, showing that intersects the information track 3, and the zero-crossings of the level 28 in response to data in the range of the signal generator crossing paths 18, according to the invention. The signal generator crossing paths 18 generates only the zero-crossing 30 where are satisfied both of the following conditions. First, the error signal of the tracking 20 must have a zero crossing 21. Secondly, the data signal 24 should not display data from the header 8 segment, causing the zero-crossing 23. If both conditions are satisfied, the signal generator crossing paths 18 generates a signal crossing the zero level 30. Therefore, the counter crossing paths can count the number of zero-crossings of the level 30 in the signal intersections track 29 in order to determine the number of information tracks 3, which crosses the optical head (not shown).

In Fig. 6 shows a second variant embodiment of the invention. The device includes a sensor 14 to determine the value of the coefficient of reflection light from the information carrier 1. The sensor 14 transmits the value of the reflection coefficient on the preamplifier 15. The preamplifier 15 generates a data signal indicating change the value of the reflection coefficient in response to the data contained on the information track 3. The preamplifier 15 may include a high pass filter, OICA/lock 31.

The selector States track/block 31 generates the control signal in response to the data signal and transmits this control signal to the generator of the tracking error 32. The sensor 14 also transmits the value of the reflection coefficient at the signal generator of the tracking error 32.

The signal generator error tracking 32 generates the error signal tracking in response to the value of the reflection coefficient of the sensor 14 in response to the control signal from the selector States track/lock 31. If the data signal does not indicates that changes in the values of the reflection coefficient occur in response to data contained in the information tracks 3, the control signal causes the formation of a signal generator of the tracking error 32 error signal of known training technique in the standard way. However, if the data signal indicates that changes in the values of the reflection coefficient is a response to the data contained in the information tracks 3, then the control signal causes the formation of a generator of the tracking error signal is of a flat shape for a short period of time. Then the generator of the tracking error 32 transmits the error signal of the tracking generator signal intersections of the track 33.

In Fig.7 shows waveforms generated by components of the above described second variant embodiment of the invention. Each signal represented in a time-dependent measured on the horizontal axis, with the beginning of the search box on the left and the end of the search on the right. Period of time 34 shows the point where the optical head (not shown) intersects the header 8 segment.

On line 71 shows the data signal 35 generated by the preamplifier 15. The signal 35 graphically displays the total value of the reflection coefficient from the storage medium 1. As shown, the signal 35 has a relatively flat shape, with the exception of the segment 36 of the signal during the time interval 34, where the data in the header 8 segment can cause changes in the total value of the reflection coefficient. Therefore, Rectionally error signal tracking 37, generated by the signal generator error tracking, according to the prior art. Signal 37 is crossing the zero level 38, which correspond to changes in the value of the reflection coefficient in response to the intersection of the optical head (not shown), the information track 3. The signal is also the segment 39, the corresponding time segment 34, when the optical head (not shown) intersects the header 8 segment. Segment 39 signal indicates changes in the values of the reflection coefficient in response to the data in the header 8 segment. Segment 39 of the signal is crossing zero level 40, which correspond to those changes. Signal crossing paths obtained from this signal 37, similar to the signal line 26 53 in Fig.5, and this signal it would not obtain the correct meter readings crossing paths.

On line 73 shows the adjusted error signal tracking 41 forming the signal generator of the tracking error 32. The signal 41 is generated in the following way. When changing the value of the reflection coefficient has a low frequency, the signal generator error tracking 32 generates the error signal of the tracking known in the art in a standard way. This is represented by the segment 42 whitefish is efficient reflection, corresponding to the segment signal line 39 to 72, the signal generator error tracking 32 checks the data signal, represented by signal line 35 71. If the data signal has a non-planar shape as the segment 36 of the signal generator error signal tracking 32 generates the segment 43 of the signal with a signal amplitude of the tracking error immediately before the detection of high-frequency changes in the value of the reflection coefficient. As soon as the return value changes of the reflection coefficient to a lower frequency, the signal generator of the tracking error is returned to the formation of the error signal tracking in a standard way.

The signal 41 corresponding to the adjusted error signal tracking has the zero-crossing 44 indicating the intersection of the optical head (not shown) of the information track 3. In contrast to the signal line 37 72 unadjusted error signal tracking, the signal line 41 73 adjusted error signal, the tracking does not have a zero crossing within the time segment 34, corresponding to the zero crossing 40. Therefore, the number of zero-crossings of the level 44 in the signal 41 shows exactly the number of information tracks 3, p is rmoney generator 33 signal intersections of paths. Signal 45 is a rectangular adjusted error signal tracking 41 generated by the signal generator of the tracking error 32.

The signal 45 crossing track is crossing the zero level 46, corresponding to the zero crossing 44 in the signal 41 error tracking. Therefore, the count of intersections of paths can count the number of zero-crossings of the level 46 in the signal 45 crossing the tracks to determine the number of information tracks 3, which crosses the optical head (not shown).

To a person skilled in the art it is obvious that various modifications of the above description of the present invention may be made within the essence and scope of the invention defined by the claims and not the foregoing description.

1. The method of moving the optical head from an initial track to the target track on the storage media that contains data that is arranged in its tracks, which determine the number of intersections of the tracks, showing the number of specified paths between the specified initial specified track and the target track; move the specified optical head from the specified initial track to a specified ranging media; produce the error signal tracking in response to said first signal, and the form of said error signal tracking has the zero-crossing of the first type corresponding to the intersection of the specified optical head to one of these tracks, and the zero-crossing of the second type corresponding to the changes specified first signal in response to the data, pass the first signal through a high pass filter to generate a signal indicator data, and the form of said signal indicator data indicator has pixels corresponding to the specified zero crossing of the second type to produce a signal count of tracks from the specified error signal tracking and the specified signal indicator data moreover, the form of said signal counting tracks is the point of intersection of the paths that meet the specified zero crossing of the first type, increase the number of counted tracks for each specified point of intersection of the tracks and stop the movement of the specified optical head, when the specified number of counted tracks becomes equal to the specified number of crossings of the tracks.

2. Way to move the optical is on his track, in which determine the number of intersections of the tracks, showing the number of specified paths between the specified initial specified track and the target track, move the specified optical head from the specified initial track to the specified the specified track, measure the level of light reflectance from the specified media information, produce the error signal tracking in response to the specified level of reflectivity, and the form of said error signal tracking has the zero-crossing of the first type corresponding to the intersection of the specified optical head to one of these tracks, and the zero-crossing of the second type corresponding to the changes specified level of reflectance in response to these data, skip the specified level of reflectance through a high pass filter to generate a signal indicator data, and the form of said signal indicator data indicator has pixels corresponding to the specified zero crossing of the second type to produce a signal count of tracks from the specified error signal tracking and the specified signal indicator data, and the form of said signal counting googlicious the number of counted tracks for each specified point of intersection of the tracks and stop the movement of the specified optical head, when the specified number of counted tracks becomes equal to the specified number of crossings of the tracks.

3. The method of moving the optical head from an initial track to the target track on the storage media that contains data that is arranged in its tracks, which determine the number of intersections of the tracks, showing the number of specified paths between the specified initial specified track and the target track, move the specified optical head from the specified initial track to the specified the specified track, measure a first signal representing an optical image reflected from the specified media information, produce the error signal tracking in response to said first signal, and the form of said error signal tracking has the zero-crossing of the first type, corresponding to the intersection of the specified optical head to one of these tracks, and the zero-crossing of the second type, corresponding to increases in the rate of change of the specified first signal, transmit said first signal through a high pass filter to generate a signal indicator data, and the form of said signal indicator data has indicatoridae from the specified error signal tracking and the specified signal indicator data moreover, the form of said signal counting tracks is the point of intersection of the paths that meet the specified zero crossing of the first type, increase the number of counted tracks for each specified point of intersection of the tracks and stop the movement of the specified optical head, when the specified number of counted tracks becomes equal to the specified number of crossings of the tracks.

4. The method of moving the optical head from an initial track to the target track on the storage media that contains data that is arranged in its tracks, which determine the number of intersections of the tracks, showing the number of specified paths between the specified initial specified track and the target track, move the specified optical head from the specified initial track to the specified the specified track, measure the level of light reflectance from the specified media information, produce the error signal tracking in response to the specified level of reflectivity, and the form of said error signal tracking has the zero-crossing of the first type corresponding to the intersection of the specified optical head to one of these tracks, and peresecheniya reflection, skip the specified level of reflectance through a high pass filter to generate a signal indicator data, and the form of said signal indicator data indicator has pixels corresponding to the specified zero crossing of the second type to produce a signal count of tracks from the specified error signal tracking and the specified signal indicator data, and the form of said signal counting tracks is the point of intersection of the paths that meet the specified zero crossing of the first type, increase the number of counted tracks for each specified point of intersection of the tracks and stop the movement of the specified optical head, when the specified number of counted tracks becomes equal to the specified number of crossings of the tracks.

5. The method of moving the optical head from an initial track to the target track on the storage media that contains data that is arranged in its tracks, which determine the number of intersections of the tracks, showing the number of specified paths between the specified initial specified track and the target track, move the specified optical head from the specified initial track to the specified SOHO media, produce the error signal tracking in response to said first signal, and the form of said error signal tracking has the zero-crossing of the first type corresponding to the intersection of the specified optical head to one of these tracks, and the zero-crossing of the second type corresponding to the changes specified first signal in response to the data, generate the signal data from the specified first signal, and the form of said signal indicator data indicator has pixels corresponding to the specified zero crossing of the second type to produce a signal count of tracks from the specified error signal tracking and the specified signal indicator data moreover, the form of said signal counting tracks is the point of intersection of the paths that meet the specified zero crossing of the first type, increase the number of counted tracks for each specified point of intersection of the tracks and stop the movement of the specified optical head, when the specified number of counted tracks becomes equal to the specified number of crossings of the tracks.

6. The method of moving the optical head from an initial track to elaut the number of crossings of the tracks, showing the number of specified paths between the specified initial specified track and the target track, move the specified optical head from the specified initial track to the specified the specified track, measure the level of light reflectance from the specified media information, produce the error signal tracking in response to the specified level of reflectivity, and the form of said error signal tracking has the zero-crossing of the first type corresponding to the intersection of the specified optical head to one of these tracks, and the zero-crossing of the second type corresponding to the changes specified level of reflectance in response to these data, produce the signal data in response to a specified level of reflectivity, and the form of said signal indicator data indicator has pixels corresponding to the specified zero crossing of the second type to produce a signal count of tracks from the specified error signal tracking and the specified signal indicator data, and the form of said signal counting tracks is the point of intersection of the paths corresponding to these intersections olewski and stop the movement of the specified optical head, when the specified number of counted tracks becomes equal to the specified number of crossings of the tracks.

7. The method of moving the optical head from an initial track to the target track on the storage media that contains data that is arranged in its tracks, which determine the number of intersections of the tracks, showing the number of specified paths between the specified initial specified track and the target track, move the specified optical head from the specified initial track to the specified the specified track, measure a first signal representing an optical image reflected from the specified media information, produce the error signal tracking in response to said first signal, and the form of said error signal tracking has the zero-crossing of the first type, corresponding to the intersection of the specified optical head to one of these tracks, and the zero-crossing of the second type, corresponding to increases in the rate of change of the specified first signal, to produce the signal data in response to said first signal, and the form of said signal indicator data indicator has a point corresponding kazandibi tracking and the specified signal indicator data moreover, the form of said signal counting tracks is the point of intersection of the paths that meet the specified zero crossing of the first type, increase the number of counted tracks for each specified point of intersection of the tracks and stop the movement of the specified optical head, when the specified number of counted tracks becomes equal to the specified number of crossings of the tracks.

8. The method of moving the optical head from an initial track to the target track on the storage media that contains data that is arranged in its tracks, which determine the number of intersections of the tracks, showing the number of specified paths between the specified initial specified track and the target track, move the specified optical head from the specified initial track to the specified the specified track, measure the level of light reflectance from the specified media information, produce the error signal tracking in response to the specified level of reflectivity, and the form of said error signal tracking has the zero-crossing of the first type corresponding to the intersection of the specified optical head to one of these tracks, and peresecheniya reflection, produce signal data pointer in response to a specified level of reflectivity, and the form of said signal indicator data indicator has pixels corresponding to the specified zero crossing of the second type to produce a signal count of tracks from the specified error signal tracking and the specified signal indicator data, and the form of said signal counting tracks is the point of intersection of the paths that meet the specified zero crossing of the first type, increase the number of counted tracks for each specified point of intersection of the tracks and stop the movement of the specified optical head, when the specified number of counted tracks becomes equal to the specified number of crossings of the tracks.

9. The device for moving the optical head to a predetermined number of tracks from the initial track to the target track on the storage media that contains data that is arranged in its tracks, which includes a sensor for level measurement of light reflectance from the specified media, the signal generator of the tracking error to generate a signal of the tracking error in response to the specified rate is sootvetstvuyushie the intersection of the specified sensor to one of these tracks, and the zero-crossing of the second type corresponding to the changes specified level of reflectance in response to these data, preamplifier, reacting to a specified level of reflection coefficient, to generate a signal data, and the data signal indicates the changes to the specified level of reflectance in response to these data, the selector States track/lock, responsive to the specified data signal and receiving the specified signal of the tracking error, the specified selector States track/block generates the output control signal and an output signal of the tracking error, and the output control signal indicates when the specified signal of the data shows the changes to the specified level of reflectance in response to these data, and the signal generator crossing paths, responsive to the output control signal and the output signal of the tracking error, and the specified signal generator crossing paths produces an output signal crossing paths with the point of intersection of the paths that meet the specified zero crossing of the first type, such that the calculation of these points of intersection is about p. 9, wherein said preamplifier includes a high-pass filter, which passes through a specified level of reflectance.

11. The device under item 9 or 10, wherein said sensor includes a split detector for measuring a specified level of reflectance.

12. The device under item 9 or 10, wherein said sensor includes a quadrature detector for measuring a specified level of reflectivity.

 

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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

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