JPH11259959A - Jump control method, jump controller and recording and/ or reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a satisfactory jump control by forming proper driving signals always. SOLUTION: A zero cross (TZC) signal is formed as shown in, for example, the figure B by performing the comparing of a tracking error(TE) signal such as to be shown in the figure A. An edge signal of the zero cross(TZC) is taken out from this signal as shown in, for example, the figure C. The number of times when controls are performed is made double of the number of times of controls which are to be performed by taking out edges of one side by taking out both of rising edges and of falling edges of this edge signal. Moreover, times of intervals for every raising edge and falling edge are measured as shown in, for example, the figure D with an arbitrary timer counter means. Then, driving signals of accelerations (positive pulses) and decelerations (negative pulses) having time widths made to respectively correspond to the lengths of measured time intervals are formed in accodance with the length of the measured time intervals as shown in, for example, the figure E. Moreover, the figure F shows a processing period and measures for performing processings in which a servo gain is raised or the like smoothly are performed for this period.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jump control method and a jump control apparatus suitable for use in a recording and / or reproducing apparatus of a high-density optical disc such as a digital video disc (DVD). Or regarding a playback device. More specifically, when a recording medium having a plurality of recording tracks or recording layers provided on a recording surface jumps from an arbitrary recording track or recording layer to another recording track or recording layer, the recording medium has an appropriate A good jump control is performed by forming a drive signal.

[0002]

2. Description of the Related Art For example, a digital video disk (DV)
In a recording and / or reproducing apparatus for a high-density optical disk such as D), a large number of recording tracks are provided on a recording surface, and a plurality of recording layers are formed. Therefore, when performing recording and / or reproduction on such a large number of recording tracks or a plurality of recording layers quickly and smoothly, these recording tracks or recording layers are skipped to a desired recording track or recording layer. It is necessary to control to reach.

Conventionally, as such jump control means, control has been performed using one type of drive signal having a fixed time width or voltage level, for example, having a reverse polarity upon start / stop. However, such a means has a very low control ability, so that the recovery when the jump becomes unstable due to scratches or dirt on the surface of the disc is slow, and depending on the conditions, the jump control becomes poor and the desired There is also a possibility that the recording track or the recording layer cannot be reached.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such a point, and the problem to be solved is that the conventional means has only one kind of drive signal, and therefore, has a problem of jumping. The recovery when the data becomes unstable is slow, and there is a possibility that the desired recording track or the recording layer may not be reached due to the poor jump control.

[0005]

According to the present invention, a time width and / or a voltage level of a drive signal formed according to an arbitrary condition at the time of jump control are controlled. According to this, it is possible to always perform appropriate jump control by forming an appropriate drive signal, and to quickly and smoothly perform recording and / or reproduction on a large number of recording tracks or a plurality of recording layers.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS That is, the present invention relates to a jump control for jumping a plurality of tracks from an arbitrary track to a desired track on a recording medium having a large number of recording tracks provided on a recording surface. A method, a jump control device, and
A recording and / or reproducing apparatus, which determines a detection signal for detecting a track which is skipping a plurality of tracks and a portion other than the track, measures a time interval at which the detection signal appears, and measures the measurement time and a reference value. And a drive signal for jumping is formed in accordance with the time difference between the two.

Also, the present invention provides a jump control method for jumping from an arbitrary track to another track on a recording medium having a plurality of recording tracks provided on a recording surface.
A jump control device and a recording and / or reproducing device, wherein a signal voltage of a first drive signal for starting a jump from a track and a second drive signal for reaching another track The level is controlled to an arbitrary ratio.

Further, the present invention provides a jump control method and a jump control apparatus for jumping from an arbitrary recording layer to another recording layer on a recording medium having a plurality of recording layers provided on a recording surface. And a recording and / or reproducing apparatus, wherein the voltage levels of a first drive signal for starting jumping from a recording layer and a second drive signal for reaching another recording layer are changed. It is controlled at an arbitrary ratio.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of an example of a jump control method, a jump control device, and a recording and / or reproducing device to which a recording and / or reproducing device is applied according to the present invention.

In FIG. 1, an optical recording medium (hereinafter, referred to as an optical disk) 1 such as a high-density optical disk such as a digital video disk (DVD) is provided.
Further, an optical pickup device 2 is provided. Then, a light (laser) beam 3 from the pickup device 2 is applied to the recording surface of the optical disk 1, and the light reflected from the recording surface of the optical disk 1 is detected by the pickup device 2.

Further, a recording / reproducing circuit 4 is provided for processing signals such as video signals, audio signals, and information signals in accordance with respective predetermined recording formats. Then, through the recording / reproducing circuit 4, input / output of information signals to be recorded / reproduced on / from the optical disk 1 using the above-mentioned pickup device 2 is performed with an arbitrary external device or the like. At the same time, the pickup device 2 detects any reflected light from the optical disk 1 described above, and supplies this detection signal to the servo processing circuit 5.

In the servo processing circuit 5, a detection signal of an arbitrary reflected light from the optical disk 1 detected by the above-described pickup device 2 is analyzed. As a result, the servo processing circuit 5 detects, for example, the focal position of the light beam 3 emitted from the above-described pickup device 2 to the optical disc 1. Then, a control signal (FOUT) for controlling the focal position within a predetermined range is supplied to the first drive circuit 6.
Is supplied to the focus control unit of the two-axis actuator (not shown) of the pickup device 2 through the control unit.

In the servo processing circuit 5, the relative positional relationship between the light beam 3 and the track on which the light beam 3 is irradiated is detected by analyzing the detection signal of the reflected light. Then, a control signal (TOUT) for controlling the relative positional relationship within a predetermined range is supplied to the tracking control unit of the two-axis actuator (not shown) of the pickup device 2 through the first drive circuit 6 described above. .

At the same time, a control signal (SOU) for moving the pickup device 2 from the servo processing circuit 5 in accordance with the amount of movement of the lens by the above-described two-axis actuator.
T) is supplied through a second drive circuit 7 to a threader motor 8 that moves the above-described pickup device 2. Thus, for example, so-called tracking control for following the track by moving the entire pickup device 2 together with the movement of the lens by the above-described biaxial actuator is performed.

Further, a speed sensor 9 for detecting the moving speed of the pickup device 2 is provided.
Is supplied to the second drive circuit 7. The control signal (SDCNT) for the target value of the moving speed of the pickup device 2 from the servo processing circuit 5 is transmitted to the second drive circuit 7.
Supplied to Thus, the moving speed of the pickup device 2 is arbitrarily controlled, and the smooth movement of the pickup device 2 is performed.

Thus, for example, the pickup device 2
From the optical disk 1 so as to focus on a desired track on the recording surface of the optical disc 1 at a predetermined focus.
The reflected light of the light beam 3 is detected by the pickup device 2. Further, by controlling the pickup device 2 by a signal from the recording / reproducing circuit 4, recording and / or reproduction of an arbitrary signal such as a video signal, an audio signal, and an information signal is performed.

In this apparatus, jump control is performed, for example, as shown in FIG. That is, first, a control signal (SOUT) as shown in FIG. 2C is supplied to the second drive circuit 7, and the drive of the sled motor 8 in a desired direction is started. Here motor 8
Is driven first in order to absorb delay components due to inertia at the time of starting, initial motion sensitivity of the motor, static friction, and the like.

Next, as shown in FIG. 2B, a control signal (T
OUT) is supplied to the first drive circuit 6, and the tracking control section of the biaxial actuator of the pickup device 2 is driven in a desired direction. Thus, the pickup device 2 analyzes, for example, a difference in reflectance between a track on the recording surface and a portion other than the track, and thereby obtains, for example, the relative position between the light beam 3 and the track as shown in FIG. A tracking error (TE) signal corresponding to the relationship is extracted.

Therefore, for example, the tracking error (T
E) By counting the zero crossings (TZC) of the signal, it is possible to detect the number of tracks that have passed by the jump. Then, in accordance with the number of tracks that have passed, for example, as shown in FIG.
By controlling the control signal (SDCNT) of the target value of the moving speed, the desired track can be quickly and smoothly reached.

FIG. 3 is a flowchart showing the flow of the processing. In FIG. 3, when the jump process is started, first, in step [1], a value (N) of the number of tracks to be jumped is set. Next, in step [2], the servo gain is increased, and in step [3], the first value (A) is set as the first target value of the moving speed of the pickup device 2. Then, in step [4], the driving of the sled motor 8 is started. Further, in step [5], driving of the two-axis actuator is started.

Further, for example, the interval of the zero cross (TZC) of the tracking error (TE) signal is measured, and in step [6], the moving speed of the pickup device 2 obtained from the measured value and the target value (A) described above. Is compared with Then, based on the comparison result, acceleration and deceleration of the drive of the sled motor 8 and the two-axis actuator described later are performed in step [7]. Note that a plurality of target values (A) may be provided, and may be sequentially switched according to, for example, the number of skipped tracks.

Further, if the number of tracks skipped in step [8] is smaller than the set value (N) by a value α (N
-Α). And when these values are equal, the step

In [9], the second value (B) is set as the target value of the moving speed of the pickup device 2, and the driving of the sled motor 8 is stopped. However, the pickup device 2 continues to be moved by inertia. The drive of the two-axis actuator is accelerated / decelerated based on the comparison with the target value (B).

Then, the number of tracks skipped in step [10] is compared with the set value (N). When these values become equal, the tracking servo is turned on in step [11], and a drive signal for deceleration is supplied to the sled motor 8 and the two-axis actuator. In step [12], the servo of the thread motor 8 is turned on. In step [13], for example, 2 msec
After the lapse of time, the servo gain is returned to normal in step [14], and the process is terminated.

That is, in this apparatus, for example, by setting an arbitrary numerical value to the above-mentioned value (N), the number of tracks is skipped, and recording and / or reproduction of a desired track is performed. Control is performed. In this apparatus, the acceleration / deceleration of the drive of the sled motor 8 and the biaxial actuator performed in the above step [7] is performed as follows.

As the acceleration / deceleration driving means, first, for example, a tracking error (TE) signal as shown in FIG. 4A is compared with a zero potential, and as shown in FIG. 4B, for example, a zero cross (TZC) signal is generated. Form a signal. From this signal, for example, as shown in FIG.
The edge signal of C) is extracted. For example, by extracting both edges of the rising edge and the falling edge of the edge signal, the number of times the control is performed can be doubled as compared with the one edge.

Further, using this edge signal, for example, as shown in FIG. 4D, the time of the interval for each edge is measured by an arbitrary timer counter means. In accordance with the length of the measured time interval, for example, acceleration (positive pulse) and deceleration (negative pulse) drive signals having corresponding time widths are formed as shown in FIG. 4E. Note that F in FIG. 4 indicates a processing period, during which a process for smoothly performing a process such as increasing the servo gain is performed.

Alternatively, as shown in FIG. 5D, the time of the interval for each edge is measured by an arbitrary timer counter. And according to the length of this measured time interval,
For example, as shown in FIG. 5E, acceleration (positive pulse) and deceleration (negative pulse) drive signals of the corresponding voltage levels are formed. Note that A to C and F in FIG.
Same as C and F.

Therefore, in this apparatus, by controlling the time width and / or the voltage level of the drive signal formed according to any conditions (interval and number of tracks during the jump) at the time of the jump control, it is always appropriate. Good jump control can be performed by forming a drive signal, and recording and / or reproduction on a large number of recording tracks can be performed quickly and smoothly.

The control of the time width and / or the voltage level of these drive signals can be arbitrarily selected according to the characteristics of each device and other conditions, and the control of the time width and / or the voltage level is also possible. , A wider range of control can be performed.

As a result, since the conventional means has only one type of drive signal, the recovery when the jump becomes unstable is slow, and it is impossible to reach a desired recording track or recording layer due to a poor jump control. According to the present invention, these problems can be easily solved.

Further, in the above-described apparatus, the target values (reference values) A and B of the moving speed of the above-described pickup device 2 are changed in accordance with the number of the jumped tracks, so that the pickup device 2 during the jump is changed. The movement can be performed quickly and smoothly. Also, by extracting a zero-cross (TZC) edge signal from, for example, both rising and falling edges, control can be performed at a high density.

According to the above-described jump control method, jump control apparatus, and recording and / or reproducing apparatus, a detection signal for detecting a track which is skipping a plurality of tracks and a portion other than the track is determined. By measuring the time interval at which a signal appears, and forming a drive signal for jumping according to the time difference between this measurement time and the reference value, always forming an appropriate drive signal and performing good jump control Thus, recording and / or reproduction for a large number of recording tracks can be performed quickly and smoothly.

Further, for example, in the flowchart of FIG. 3 described above, N = 1 is set in step [1], and steps [4], [6] to

By deleting [9], for example, one track can be skipped. That is, in this case, for example, a first drive signal for starting jumping is formed in step [5], and a second drive signal for reaching another track is formed in step [11]. . In step [11], a stop drive signal is mainly supplied to the biaxial actuator.

In this case, the first drive signal is formed, for example, at the voltage level Vtk, for example, as shown on the left side of FIG. 6B. At this time, a tracking error (TE) signal as shown in FIG. 6A is discriminated, and for example, from the zero cross (TZC) signal of the tracking error (TE) signal as shown in FIG. As shown in (2), a second drive signal of, for example, a voltage level k · Vtk is formed. D in FIG. 6 indicates a processing period, in which a measure such as increasing the servo gain is performed.

Therefore, in this device, the voltage levels of the first drive signal for starting jumping from an arbitrary track and the second drive signal for reaching another track are set at an arbitrary ratio. By controlling, for example, 1
The jump of the truck can be performed favorably.

Further, this one-track skipping configuration is used, for example, for a recording medium having a plurality of recording layers provided on a recording surface, to jump from any recording layer to another recording layer. It can also be applied to jump control. That is, instead of the tracking error (TE) signal described above,
For example, by detecting a focus error (FE) signal in focus control and using its zero cross (FZC), jump control for jumping from an arbitrary recording layer to another recording layer can be performed.

In this case, for example, the first drive signal is, for example, a voltage level Vfk as shown on the left side of FIG.
Is formed. At this time, a focus error (FE) signal as shown in FIG. 7A is determined. For example, a zero-cross (FZC) signal of the tracking error (FE) signal as shown in FIG. As shown in (2), a second drive signal of a voltage level k · Vfk is formed, for example.

When jumping from an arbitrary recording layer to another recording layer, there occurs a period in which a focus error (FE) signal cannot be obtained between the first and second drive signals. Low voltage level a · V to relax
A drive signal of fk is supplied. D in FIG. 7 indicates a processing period, in which a measure such as increasing the servo gain is performed.

As a result, jumping from an arbitrary recording layer is started by the above-described first drive signal, and good arrival at a desired recording layer is performed by the second drive signal. By setting the number N of jumps arbitrarily within the range of the number of recording layers provided, for example, jumping between an arbitrary number of recording layers can be performed.

Therefore, in this apparatus, the voltage levels of the first drive signal for starting jumping from an arbitrary recording layer and the second drive signal for reaching another recording layer are set to arbitrary voltage levels. By controlling the ratio, it is possible to satisfactorily skip, for example, between any recording layers.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0042]

Accordingly, claims 1 to 4, claims 9 to 12,
According to the seventeenth to twentieth aspects of the present invention, by controlling the time width and / or the voltage level of the drive signal formed in accordance with an arbitrary condition (interval and number of tracks during jump) during jump control, A good jump control can be performed by always forming an appropriate drive signal, and recording and / or reproduction on a large number of recording tracks can be performed quickly and smoothly.

The control of the time width and / or the voltage level of these drive signals can be arbitrarily selected according to the characteristics of each device and other conditions, and these time widths and / or voltage levels can be controlled. By combining these controls, a wider range of control can be performed.

As a result, in the conventional means, since only one type of drive signal is used, the recovery when the jump becomes unstable is slow, and it is impossible to reach a desired recording track or recording layer due to a poor jump control. According to the present invention, these problems can be easily solved.

According to the fifth, thirteenth, and twenty-first aspects of the present invention, the jumping speed can be changed quickly and smoothly by changing the reference value of the moving speed according to the number of jumped tracks. Can be done.

According to the inventions of claims 6, 14 and 22, the zero-crossing (TZC) edge signal can be controlled at a high density by extracting, for example, both rising and falling edges. It is.

Further, according to the seventh, fifteenth and twenty-third aspects, the first drive for starting jumping from an arbitrary track on a recording medium having a plurality of recording tracks on a recording surface. By controlling the voltage level of the signal and the signal of the second drive signal for reaching another track at an arbitrary ratio, for example, one track can be skipped satisfactorily.

Further, according to the invention of claims 8, 16 and 24, a first medium for starting jumping from an arbitrary recording layer to a recording medium having a plurality of recording layers on a recording surface is provided. By controlling the voltage level of the drive signal and the signal level of the second drive signal for reaching another recording layer at an arbitrary ratio, for example, it is possible to satisfactorily jump between any recording layers. is there.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a configuration of a recording and / or reproducing apparatus to which a jump control method, a jump control apparatus, and a recording and / or reproducing apparatus according to the present invention are applied.

FIG. 2 is a waveform chart for explaining the operation.

FIG. 3 is a flowchart for explaining the operation.

FIG. 4 is a waveform chart for explaining the operation.

FIG. 5 is a waveform chart for explaining the operation.

FIG. 6 is a waveform chart for explaining the operation.

FIG. 7 is a waveform chart for explaining the operation.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical disk, 2 ... Pickup device, 3 ... Light beam, 4 ... Recording / reproducing circuit, 5 ... Servo processing circuit, 6 ... First
7, a second drive circuit, 8: a threader motor, 9: a speed sensor

Claims (24)

[Claims] 1. A jump control method for skipping a plurality of tracks from an arbitrary track to reach a desired track on a recording medium having a plurality of recording tracks provided on a recording surface, wherein: A detection signal for detecting the track and a portion other than the track while jumping a plurality of tracks is determined, a time interval at which the detection signal appears is measured, and the jump of the jump is determined according to a time difference between the measurement time and a reference value. Control method, characterized by forming a drive signal for the jump. 2. The jump control method according to claim 1, wherein a time width of the formed drive signal is controlled according to the time difference. 3. The jump control method according to claim 1, wherein a voltage level of the formed drive signal is controlled in accordance with the time difference. 4. The jump control method according to claim 1, wherein a time width and / or a voltage level of the formed drive signal is controlled according to the time difference. 5. The jump control method according to claim 1, wherein the reference value is changed according to the number of the skipped tracks. 6. The jump control method according to claim 1, wherein the measurement of the time interval is performed at both switching points of the track and a portion other than the track. 7. A jump control method for jumping from a given track to another track on a recording medium provided with a plurality of recording tracks on a recording surface, wherein the jump from the track is performed. Controlling the voltage level of the signal between the first drive signal for starting the second drive signal and the second drive signal for reaching the other track at an arbitrary ratio. 8. A jump control method for jumping from a given recording layer to another recording layer on a recording medium having a plurality of recording layers provided on a recording surface, wherein the recording layer Control, wherein the voltage levels of the first drive signal for starting jumping from the second drive signal and the second drive signal for reaching the other recording layer are controlled at an arbitrary ratio. Method. 9. A jump control device for jumping a plurality of tracks from an arbitrary track to a desired track on a recording medium having a plurality of recording tracks provided on a recording surface, wherein: Detecting means for detecting the track and a portion other than the track while jumping a plurality of tracks; measuring means for measuring a time interval of a detection signal detected by the detecting means; and a time difference between the measured time and a reference value. And a drive signal forming means for forming a drive signal for the jump in accordance with the jump control device. 10. The jump control device according to claim 9, wherein the drive signal forming means controls a time width of the formed drive signal in accordance with the time difference. 11. The jump control apparatus according to claim 9, wherein the drive signal forming means controls a voltage level of the formed drive signal in accordance with the time difference. 12. The jump control device according to claim 9, wherein the drive signal forming means controls a time width and / or a voltage level of the formed drive signal in accordance with the time difference. apparatus. 13. The jump control device according to claim 9, wherein the drive signal forming means changes the reference value in accordance with the number of the jumped tracks. 14. The jump control device according to claim 9, wherein the drive signal forming means measures the time interval at a switching point of both the track and a portion other than the track. 15. A jump control device for jumping from a given track to another track on a recording medium having a plurality of recording tracks provided on a recording surface, wherein the jumping from the track is performed. Control means for controlling a voltage level of a signal between a first drive signal for starting the driving and a second drive signal for reaching the other track at an arbitrary ratio. Control device. 16. A jump control device for jumping from a given recording layer to another recording layer and reaching a recording medium having a plurality of recording layers provided on a recording surface, wherein: Control means for controlling the voltage level of the signal between the first drive signal for starting jumping from the second drive signal and the second drive signal for reaching the other recording layer at an arbitrary ratio. A special jump control device. 17. A recording and / or reproducing apparatus for skipping a plurality of tracks from a given track to reach a desired track on a recording medium having a plurality of recording tracks provided on a recording surface. Detecting means for detecting the track and a portion other than the track jumping over the plurality of tracks; measuring means for measuring a time interval of a detection signal detected by the detecting means; and And a drive signal forming means for forming a drive signal for jumping in accordance with the time difference of the recording and / or reproducing apparatus. 18. The recording and / or reproducing apparatus according to claim 17, wherein the drive signal forming means controls a time width of the formed drive signal according to the time difference. Playback device. 19. The recording and / or reproducing apparatus according to claim 17, wherein the drive signal forming means controls a voltage level of the formed drive signal according to the time difference. Playback device. 20. The recording and / or reproducing apparatus according to claim 17, wherein the drive signal forming means controls a time width and / or a voltage level of the formed drive signal according to the time difference. Recording and / or playback device. 21. The recording and / or reproducing apparatus according to claim 17, wherein the drive signal forming means changes the reference value according to the number of the skipped tracks. apparatus. 22. The recording and / or reproducing apparatus according to claim 17, wherein the drive signal forming means measures the time interval at a switching point of both the track and a portion other than the track. And / or a playback device. 23. A recording and / or reproducing apparatus for jumping from a given track to another track on a recording medium having a plurality of recording tracks provided on a recording surface, comprising: Control means for controlling a voltage level of a signal between a first drive signal for starting jumping from the second track and a second drive signal for reaching the other track at an arbitrary ratio. Recording and / or reproducing apparatus. 24. A recording and / or reproducing apparatus for reaching a recording medium having a plurality of recording layers provided on a recording surface by jumping from any of the recording layers to another recording layer, Control means is provided for controlling a signal voltage level of a first drive signal for starting jumping from the recording layer and a second drive signal for reaching the other recording layer at an arbitrary ratio. Recording and / or reproducing apparatus characterized by the above-mentioned.