JP2001266365A - Disk controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that the jump operation becomes unstable due to the disturbance of a tracking error signal at the connected parts of tracks in a disk provided with spiral tracks alternately connected with the tracks having opposite polarities of the tracking error signals. SOLUTION: The connected parts of the tracks are detected by a polarity control means, and the polarity of the tracking error signal is changed over by a polarity inversion means. A jump control means is started by a control timing signal according to the marking recorded on the optical disk to fetch the tracking error signal, the polarity of which is changed over. Thus, the phase between the connected part of the track and the signal fetch timing is kept always in constant, and the unstable tracking error signal is removed. Consequently, the stable jump operation without the counting error of the number of tracks nor the deviation of the output timing of the decelerated pulse is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a disk controller for controlling an actuator of an optical head for reading a signal from an optical disk or writing a signal to the optical disk. In particular, the present invention relates to a disk control device that performs a stable on-track operation and a jump operation on an optical disk having spiral tracks in which tracks having different configurations are alternately connected on a recording surface.

[0002]

2. Description of the Related Art A disk-shaped information recording medium in which tracks having different configurations are alternately connected to form a spiral track as a whole on a recording surface, and a recording / reproducing apparatus for recording / reproducing on / from the information recording medium. Is described, for example, in JP-A-8-3
No. 06081.

[0003] In the information recording medium disclosed in this publication, there are no pits on the disk, and land tracks and groove tracks are alternately connected via a mirror section to form a spiral track. Further, the disk control device of the recording / reproducing device disclosed in the publication switches the polarity of the tracking error signal by detecting the mirror portion.

[0004]

In the above disk controller, the correlation between the switching of the polarity of the tracking error signal performed at the joint of the tracks (mirror portion) and the control timing of the actuator for performing the on-track operation and the jump operation. There is no. Further, the tracking error signal captured near the joint of the tracks has low reliability.

Therefore, in the jump operation, when the tracking error signal is compared and the number of tracks during the jump is counted, a counting error may occur at the joint of the tracks. Therefore, in order to improve the reliability of the jump operation, it is necessary to prevent the jump operation from being performed near the joint of the tracks. For this reason, a waiting time occurs in the jump operation, and the access speed of the drive decreases.

Further, when the output timing of the deceleration command at the end of the jump is determined by the tracking error signal, if the tracking error signal becomes unstable at the joint of the tracks, the output timing is incorrect and the jump operation becomes unstable.

An object of the present invention is to solve the above-mentioned problems and to provide a disk control device capable of performing not only a stable on-track operation but also a stable jump operation.

[0008]

The present invention has the following configuration to achieve the above object.

A disk control device according to a first configuration of the present invention is arranged at a predetermined position with respect to a recording surface on which a continuous track in which tracks having different configurations are connected alternately is formed, and a connection portion of the tracks. A disk controller for recording information on and / or reproducing recorded information from an optical disk having a marking for determining a set control timing, irradiating the recording surface of the optical disk with light and detecting reflected light thereof Light detecting means, a moving means for moving the light detecting means in a direction orthogonal to the optical axis thereof, a tracking error signal generating means for generating a tracking error signal based on an output of the light detecting means, Polarity control means for detecting a connection portion of the track based on the output of the light detection means and outputting a polarity inversion command; A polarity inverting unit for inverting the polarity of the tracking error signal, a control timing signal generating unit for outputting a control timing signal based on the marking, and an output signal of the polarity inverting unit based on the control timing signal; Tracking control means for performing on-track operation by controlling means; and jump control for taking in an output signal of the polarity inversion means based on the control timing signal and controlling the moving means in accordance with a track jump instruction to perform a jump operation. Means.

According to the first configuration, the control timing signal is generated based on the marking recorded at a point having a predetermined relative positional relationship with the connecting portion of the track,
The tracking control means and the jump control means take in the tracking error signal based on the signals and control the on-track operation and the jump operation. Therefore, the phase relationship between the timing at which the tracking control means and the jump control means take in the tracking error signal and the timing at which the light spot passes through the connecting portion of the track is uniquely determined by the optical disc, and there is no disturbance. As a result, it is possible to prevent an unstable tracking error signal generated at a track connection portion from being captured. Therefore, a stable jump operation can always be realized without erroneous timing of counting the number of tracks or outputting a deceleration pulse.

An optical disk control device according to a second configuration of the present invention records and / or records information on an optical disk having a recording surface on which continuous tracks in which tracks having different configurations are alternately connected are formed. A disk control device for reproducing the read information, the light detecting unit irradiating light to the recording surface of the optical disk and detecting the reflected light thereof, and a direction perpendicular to the optical axis of the light detecting unit. A tracking error signal generating means for generating a tracking error signal based on an output of the light detecting means, and detecting a connection portion of the track based on an output of the light detecting means and outputting a polarity inversion command. Polarity control means for performing a polarity inversion operation, polarity inversion means for inverting the polarity of the tracking error signal based on the polarity inversion command, and timing of a predetermined cycle. Timer means for outputting a signal, a mask signal generating means for outputting a mask signal for a predetermined time based on the polarity inversion command, mask means for masking the timing signal based on the mask signal, and the mask means A tracking control unit that captures an output signal of the polarity inversion unit based on the masked timing signal and controls the moving unit to perform an on-track operation; and the polarity inversion unit based on the timing signal masked by the masking unit. Jump control means for taking in an output signal of the means and controlling the moving means in accordance with a track jump instruction to perform a jump operation.

According to the second configuration, the timing signal is masked for a predetermined time near the track connecting portion, and the tracking control means and the jump control means take in the tracking error signal at the timing of the masked timing signal and turn on the tracking error signal. Controls track operation and jump operation. Therefore, it is possible to prevent the unstable tracking error signal generated at the track connection portion from being captured. Therefore, a stable jump operation can always be realized without erroneous timing of counting the number of tracks or outputting a deceleration pulse.

[0013] In a disk control device according to a third configuration of the present invention, information is recorded and / or recorded on an optical disk having a recording surface on which continuous tracks in which tracks having different configurations are alternately connected are formed. A disc control device for reproducing information, comprising: a light detecting means for irradiating a recording surface of the optical disc with light to detect reflected light; and moving the light detecting means in a direction orthogonal to the optical axis. Moving means for moving, a tracking error signal generating means for generating a tracking error signal based on an output of the light detecting means, and a polarity for detecting a connecting portion of the track based on an output of the light detecting means and outputting a polarity reversal command. Control means; polarity inversion means for inverting the polarity of the tracking error signal based on the polarity inversion command; and a predetermined phase correlation with the polarity inversion command. Control timing signal generating means for outputting a control timing signal having: a tracking control means for capturing an output signal of the polarity inversion means based on the control timing signal, controlling the moving means to perform an on-track operation, and Jump control means for taking in an output signal of the polarity inversion means based on a control timing signal and controlling the movement means in accordance with a track jump instruction to perform a jump operation.

According to the third configuration, a track connection portion is detected, and a control timing signal having a predetermined phase relationship with the track connection portion is generated. The tracking control means and the jump control means use the timing of the control timing signal to generate the control timing signal. It captures a tracking error signal and controls on-track operation and jump operation. By setting the phase relationship appropriately, it is possible to prevent an unstable tracking error signal generated at a track connecting portion from being captured. Therefore, a stable jump operation can always be realized without erroneous timing of counting the number of tracks or outputting a deceleration pulse.

According to a fourth aspect of the present invention, there is provided a disk control apparatus for recording and / or recording information on an optical disk having a recording surface on which a continuous track in which tracks having different configurations are alternately connected is formed. A disc control device for reproducing information, comprising: a light detecting means for irradiating a recording surface of the optical disc with light to detect reflected light; and moving the light detecting means in a direction orthogonal to the optical axis. Moving means for moving, a tracking error signal generating means for generating a tracking error signal based on an output of the light detecting means, and a polarity for detecting a connecting portion of the track based on an output of the light detecting means and outputting a polarity reversal command. Control means; polarity inversion means for inverting the polarity of the tracking error signal based on the polarity inversion command; Holding means for holding and outputting an output signal of the polarity inversion means for a time, timer means for outputting a timing signal of a predetermined period, and taking in an output signal of the holding means based on the timing signal; Tracking control means for performing an on-track operation by controlling the control means, and a jump control means for taking in an output signal of the hold means based on the timing signal and controlling the movement means in accordance with a track jump instruction to perform a jump operation. It is characterized by having.

According to the fourth configuration, the connection portion of the track is detected, and the value of the tracking error signal immediately before the connection portion is held for a predetermined time. The tracking control means and the jump control means take in the tracking error signal after the hold processing at a predetermined timing to control the on-track operation and the jump operation. Therefore, it is possible to prevent the unstable tracking error signal generated at the track connection portion from being captured. Therefore, a stable jump operation can always be realized without erroneous timing of counting the number of tracks or outputting a deceleration pulse.

[0017]

(Embodiment 1) FIG. 1 is a configuration diagram schematically showing a disk control device according to Embodiment 1 of the present invention.

On the recording surface of the disc-shaped optical disk 1, two types of tracks A and B having different configurations are connected alternately to form one continuous spiral track. Tracks A and B are formed with pits for sample servo.

FIG. 2 is an enlarged view showing the structure of sample servo pits formed on a track. In FIG. 2, a dotted line and a chain line are center lines of tracks A and B, respectively. The disk of this embodiment has only a pit for sample servo formed along a track on a flat plate,
Tracks by lands and grooves are not formed as in the second to fourth embodiments described later.

In FIG. 2, the left side is the inner side of the disk and the right side is the outer side of the disk, and the light beam spot moves relative to the disk in the direction of arrow 51 along the track. Clock pit 40, first wobble pit 41, second wobble pit 42, address pit 43 along the moving direction of the light beam spot
Are formed in order. Clock pits 40 and address pits 43 are formed on the center lines of tracks A and B. The first wobble pit 41 and the second wobble pit 42 are formed between the respective center lines of the tracks A and B.
First wobble pit 41 with respect to track A centerline
And the arrangement order of the second wobble pits 42 and the track B
The wobble pits 41 and 42 are arranged such that the arrangement order of the first wobble pits 41 and the second wobble pits 42 with respect to the center line is opposite to each other.

FIG. 3 is a conceptual diagram showing a method of generating a tracking error signal output by a tracking error signal generation circuit (A) 17 described later. The horizontal axis represents the time axis, and the vertical axis represents the output signal intensity of the photodetector that outputs a signal corresponding to the amount of light reflected from the recording surface of the optical disc. When the light beam spot moves along the track shown in FIG. 2 in the direction of arrow 51, the output signal changes due to the formed pits. In FIG. 3, P40, P41 and P42 are a clock pit 40 and a first wobble pit 4 respectively.
1, the bottom of the signal due to the second wobble pit 42 is shown. Bottom P4 of signal due to first wobble pit 41
The tracking error signal STE is obtained by subtracting the value W2 of the bottom P42 of the signal of the second wobble pit 42 from the value W1 of 1 (W1-W2). When the light spot is traveling on the track A and the light spot is deviated toward the outer periphery of the disk, the tracking error signal STE becomes a negative value. On the other hand, when the light spot is running on the track B and the light spot is similarly deviated toward the outer periphery of the disk, the tracking error signal STE becomes a positive value. That is, the tracking error signal S on the track A and the track B
The polarity of TE is reversed.

As shown in FIG. 1 (A), the optical disc 1 of the present embodiment spirally connects the tracks A and B whose tracking error signals have opposite polarities alternately. With trucks arranged. FIG. 1 (A)
As shown in (1), the connecting portions of both tracks are formed on the same radius. FIG. 1 is an enlarged view of a connection portion of FIG.
It is shown in (B). As shown, the sample servo sample points 44 (for example, clock pit 4
0 and the first and second wobble pits 41 and 42) are arranged, and each block sandwiched between adjacent sample points 44 along the track forms one segment. Each segment is provided with a unique address, and the address is represented by an address pit 43 in FIG.

In FIG. 1, reference numeral 22 denotes an optical pickup having a laser light source, an objective lens, and a photodetector, and reference numeral 34 denotes an actuator for driving the optical pickup 22 in the radial direction of the optical disk 1.

Reference numeral 10 denotes a segment address detected from a signal obtained by the optical pickup 22 detecting reflected light from the address pits 43 on the track, detects a seam (connection portion) of the track, and outputs a polarity inversion command S10. A track joint detection circuit (A).

A control timing generating circuit (A) 11 detects a clock pit 40 on the optical disk 1 from the signal detected by the optical pickup 22 and outputs a control command (control timing signal S11) at a timing when a new tracking error signal STE is determined. ).

Reference numeral 12 denotes a jump control circuit, which outputs an acceleration pulse and a deceleration pulse to the drive circuit 33 when a track jump instruction is issued. Further, the output signal of the polarity inversion circuit 28 is binarized to generate a track cross signal, and the number of jumping tracks is counted to detect and control the accurate number of moving tracks. Further, in order to stabilize the jump operation, the output timing of the deceleration pulse is set to the polarity inversion
Is determined based on the output of

The operation of the disk control device configured as described above will be described.

First, normal tracking control (on-track operation) will be described with reference to the timing chart of FIG.

The optical pickup 22 receives the reflected light from the disk 1 and sends a reproduction signal of the light to the tracking error signal generation circuit (A) 17. The tracking error signal generation circuit (A) 17 identifies a pit signal from the reproduced signal and creates a tracking error signal STE by the method shown in FIG. At the same time, the track joint detection circuit (A) 10 detects a segment address from the address pits 43 on the disk, determines a joint between tracks, and outputs a polarity inversion command S10 as shown in FIG. The polarity inversion circuit 28 switches the polarity of the tracking error signal STE output from the tracking error signal generation circuit (A) 17 in accordance with the polarity inversion command S10 output from the track seam detection circuit (A) 10 and obtains the obtained tracking error signal S28. To the tracking control circuit 29. On the other hand, the control timing generation circuit (A) 11 detects the clock pit 40 from the reproduction signal from the optical pickup 22 and the tracking control circuit 29 at the timing when the output STE of the tracking error signal generation circuit (A) 17 will be determined. To the control timing signal S11. The tracking control circuit 29 is started at the timing of the control timing signal S11, takes in the tracking error signal S28, and
The filtering process is performed on the tracking error signal S28 in accordance with the instruction, and the control signal thus obtained is output to the drive circuit 33. As a result, the driving circuit 33
Drive.

As described above, the light beam can always trace on a continuous track. That is, a track seam detecting circuit (A) 10 for detecting a seam of a track from a pit of a disk and a control timing generating circuit (A) 11 for generating a control timing signal from the pit are provided. By forming a control loop by matching the polarities of the tracking error signals of the track B, as shown in FIG. 2, sample servo wobble pits 41 and 42 are provided so that the polarity of the tracking error signal STE changes every rotation. Tracking control of the optical disc can be stably performed.

Next, the jump operation will be described with reference to the timing chart of FIG.

When a jump command signal for a plurality of tracks is output from the system controller 31, the output of the tracking control circuit 29 becomes zero. Further, the jump control circuit 12 outputs an acceleration pulse.

During the jump, the tracking error signal generation circuit (A) 17 identifies a signal based on the pits for sample servo on the disk 1 and creates a discrete tracking error signal STE. As shown in FIG. 5, the tracking error signal STE obtained when the light spot crosses the track diagonally changes sinusoidally when viewed macroscopically. The peaks and valleys of the sine wave coincide with the point in time when they pass the boundary of an adjacent track. However, when the light spot passes through the joint between the tracks A and B, the polarity is inverted before and after the passage, so that the macroscopic sine wave is discontinuous in this portion.

In parallel with this, the track seam detection circuit (A) 10 detects a seam of the track and outputs a polarity inversion command S10. The polarity inversion circuit 28 switches the tracking error signal STE output from the tracking error signal generation circuit (A) 17 according to the polarity inversion command S10 output from the track seam detection circuit (A) 10 and outputs the obtained tracking error signal S28. I do. As shown in FIG. 5, in the tracking error signal S28, the macroscopic sine wave discontinuity that occurs when the light spot passes through the seam of the track, which the tracking error signal STE has, is eliminated. Macroscopically, it becomes a beautiful continuous sine wave. On the other hand, the control timing generation circuit (A) 11
Detects the clock pit 40 from the reproduction signal from the optical pickup 22, and outputs the control timing signal S11 at a timing when the output STE of the tracking error signal generation circuit (A) 17 will be determined. The jump control circuit 12 is started at the timing of the control timing signal S11, takes in the tracking error signal S28, creates a track cross signal S12 based on the sinusoidal tracking error signal S28, and counts the number of jumped tracks. When the counted number of tracks reaches the number specified by the system controller 31 or reaches a predetermined number before the number, a deceleration pulse is output at a timing determined based on the level of the tracking error signal S28 from the polarity inversion circuit 28.

When only one track is jumped, the number of tracks is not counted by the track cross signal, and the jump control circuit 12 outputs the tracking error signal S28 from the polarity inversion circuit 28 immediately after outputting the acceleration pulse. A deceleration pulse is output at a timing determined based on the level.

As described above, according to the present embodiment, the track joint detection circuit (A) 10 detects the joint of the tracks from the pits of the disk, and the polarity inversion circuit 28 detects the tracking error signal STE of the tracks A and B.
The signal thus obtained is taken into the jump control circuit 12 based on the control timing signal generated from the pit by the control timing generation circuit (A) 11. Since the phase between the track seam and the signal fetch timing can be kept constant, it is possible to prevent the unstable tracking error signal from being fetched into the jump control circuit 12. Therefore, the polarity of the tracking error signal STE is 1
It is possible to stably perform the track jump control of the disc that changes with each rotation.

In this embodiment, the control timing signal generation circuit (A) 11 outputs the control timing signal S11 by estimating the timing of generation of the tracking error signal STE from the clock pit 40. It is not limited to such a configuration. For example, the tracking error signal generation circuit (A) 17
A configuration may be adopted in which the determination of TE is determined and the control timing signal is output to the tracking control circuit 29 and the jump control circuit 12 by itself.

In this embodiment, the track seam is detected by the segment address of the disk 1. However, a method of detecting the track seam from the signal recorded on the track may be adopted.

(Embodiment 2) FIG. 6 is a configuration diagram schematically showing a disk control apparatus according to Embodiment 2 of the present invention. The same components as those in FIG. 1 are denoted by the same reference numerals, and a duplicate description thereof will be omitted.

On the surface of the disk-shaped optical disk 2, two types of tracks A and B having different configurations are alternately connected, and
A continuous spiral track of books is formed. FIG.
, The dotted line and the chain line are the center lines of tracks A and B, respectively. In the tracks A and B of the optical disc 2 of the present embodiment, no pits for sample servo are formed as in the tracks of the optical disc 1 of the first embodiment. For example, track A is a land track, and track B is a groove track. Information is recorded on both track A and track B. As is well known,
The polarity of the tracking error signal is inverted between the case where the light spot traces the track A (for example, a land track) and the case where the light spot traces the track B (for example, a groove track).

As shown in FIG. 6 (A), the optical disk 2 of the present embodiment spirally connects the tracks A and B having opposite polarities of the tracking error signal alternately. With trucks arranged. FIG. 6 (A)
As shown in (1), the connecting portions of both tracks are formed on the same radius. FIG. 6 is an enlarged view of the connection portion of FIG.
It is shown in (B). As illustrated, the track A and the track B are continuous with a mirror portion 45 formed in the radial direction interposed therebetween. In the present invention, the track A and the track B are also referred to as "connected" even when the track A and the track B are arranged in the respective substantially extending directions with the mirror portion 45 interposed therebetween. A state in which tracks A and B are alternately connected in this way is referred to as “continuous”.

In FIG. 6, reference numeral 18 denotes a track joint detection circuit (B), which is a track A and a track B on the disk.
To detect the mirror portion 45 provided at the seam of, and outputs a polarity inversion command S18. Reference numeral 15 denotes a mask signal generation circuit which outputs a mask signal S15 for a predetermined time based on a switching point of the polarity inversion command S18 output from the track seam detection circuit (B) 18. A timer circuit 13 outputs a control timing signal S13 at a predetermined cycle. Reference numeral 14 denotes a mask circuit, which masks the control timing signal S13 output from the timer circuit 13 and outputs the masked control timing signal S14 while the mask signal S15 output from the mask signal generation circuit 15 is being input.

The operation of the disk control device configured as described above will be described.

First, normal tracking control (on-track operation) will be described. Based on the reproduction signal from the optical pickup 22, the tracking error signal generation circuit (B) 23 generates a tracking error signal STE,
Output to the polarity inversion circuit 28. When detecting the mirror portion 45, the track seam detection circuit (B) 18 outputs a polarity inversion command S18. The polarity inversion circuit 28 switches the polarity of the tracking error signal STE based on the polarity inversion command S18, and outputs the tracking error signal S28 whose polarity has been switched. The tracking control circuit 29 controls the control timing signal S14 partially masked by the mask circuit 14.
Is activated to capture the tracking error signal S28, filter the tracking error signal S28 according to the instruction of the system controller 31, and output the control signal thus obtained to the drive circuit 33. As a result, the drive circuit 33 drives the actuator 34. Since the activation timing of the tracking control circuit 29 is based on the masked control timing signal S14, the tracking control circuit 29 is not activated while the light spot is passing through the mirror 45. As described above, the light beam can always trace on a continuous track. That is, tracking control of the optical disk in which the polarity of the tracking error signal changes every rotation can be stably performed.

Next, the jump operation will be described with reference to the timing chart of FIG.

When a jump command signal for a plurality of tracks is output from the system controller 31, the output of the tracking control circuit 29 becomes zero. Further, the jump control circuit 12 outputs an acceleration pulse.

A tracking error signal S obtained when a light spot crosses a track diagonally due to a jump.
TE changes sinusoidally as shown in FIG. The peaks and valleys of the sine wave coincide with the point in time when they pass the boundary of an adjacent track. However, the tracking error signal STE becomes zero while the light spot is passing through the mirror section 45, and the polarity is inverted before and after passing. As a result, the sine wave becomes discontinuous.

At the same time, the track seam detecting circuit (B) 18 detects the mirror section 45 and issues a polarity inversion command S18.
Is output. The polarity inversion circuit 28 switches the polarity of the tracking error signal STE output from the tracking error signal generation circuit (B) 23 in accordance with the polarity inversion command S18 output from the track seam detection circuit (B) 18, and the tracking error signal after the polarity switching. S28 is output. The jump control circuit 12 is started by the control timing signal S14 partially masked by the mask circuit 14, and discretely detects the tracking error signal S28. By setting the masking period T1 to be equal to or longer than the transit time of the mirror section 45, a substantially sinusoidal tracking error signal S28 'shown in FIG. 7 is captured. Then, the jump control circuit 12 generates the tracking error signal S having a substantially sinusoidal waveform.
A track cross signal S12 is created based on the reference number 28 ', and the number of tracks jumped is counted. Then, when the counted number of tracks reaches the number specified by the system controller 31 or reaches a predetermined number, a deceleration pulse is output at a timing determined based on the level of the tracking error signal S28 'from the polarity inversion circuit 28.

When jumping only one track, the number of tracks is not counted by the track cross signal, and the jump control circuit 12 immediately follows the acceleration pulse to output the tracking error signal S28 'from the polarity inversion circuit 28. The deceleration pulse is output at the timing determined based on the level of.

As described above, according to the present embodiment, since the control timing signal S13 output from the timer circuit 13 is masked by the mask circuit 14 based on the mask signal S15 output from the mask signal generation circuit 15, the mirror section Even if the tracking error signal STE becomes unstable at 45, the control does not become unstable thereby. Further, in the jump operation, the tracking error signal S28 'sampled by the masked control timing signal S14.
Is used to generate the track cross signal S12, the erroneous track count is prevented, and the deceleration timing using the tracking error signal can be accurately detected. As described above, a stable jump operation can be realized.

In this embodiment, the reversal timing of the polarity of the tracking error signal STE is determined by directly detecting the mirror portion 45 on the disk 2, but the present invention is not limited to such a configuration. For example, it is also possible to indirectly detect the mirror section 45 using an address or the like recorded in a track and determine the timing of reversal of the polarity of the tracking error signal STE.

The configuration of the disk 2 is not limited to the configuration shown in FIG.

The timer circuit 13 may be reset at the end of the mask signal S15 output from the mask signal generation circuit 15. Thus, the disturbance of the cycle of the control timing signal S13 can be minimized, and the stability of control can be improved.

(Embodiment 3) FIG. 8 is a block diagram schematically showing a disk control apparatus according to Embodiment 3 of the present invention. The same components as those in FIGS. 1 and 6 are denoted by the same reference numerals, and a duplicate description thereof will be omitted.

The optical disk 2 of the present embodiment has the same configuration as that of the second embodiment.

In FIG. 8, reference numeral 19 denotes a control timing generation circuit (B), which is a predetermined timing for the polarity inversion command signal S18 by PLL control based on the polarity inversion command S18 output from the track seam detection circuit (B) 18. A control timing signal S19 having a phase relationship is created.

The operation of the disk control device configured as described above will be described.

First, normal tracking control (on-track operation) will be described. Based on the reproduction signal from the optical pickup 22, the tracking error signal generation circuit (B) 23 generates a tracking error signal STE,
Output to the polarity inversion circuit 28. When detecting the mirror portion 45, the track seam detection circuit (B) 18 outputs a polarity inversion command S18. The polarity inversion circuit 28 switches the polarity of the tracking error signal STE based on the polarity inversion command S18, and outputs the tracking error signal S28 whose polarity has been switched. The tracking control circuit 29 is activated by the control timing signal S19 output from the control timing generation circuit (B) 19, captures the tracking error signal S28, filters the tracking error signal S28 according to the instruction of the system controller 31, and thus obtains the tracking error signal S28. The control signal is output to the drive circuit 33. As a result, the drive circuit 33 drives the actuator 34. The activation timing of the tracking control circuit 29 is based on the control timing signal S19 based on the polarity inversion command S18 output from the track seam detection circuit (B) 18. If the phase of the control timing signal S19 with respect to the polarity reversal command S18 is set so that the value of the control timing signal S19 becomes zero while the light spot is passing through the mirror unit 45, tracking is performed while the light spot is passing through the mirror unit 45. The control circuit 29 does not start. As described above, the light beam can always trace on a continuous track. That is, tracking control of the optical disk in which the polarity of the tracking error signal changes every rotation can be stably performed.

Next, the jump operation will be described with reference to the timing chart of FIG.

When a jump command signal for a plurality of tracks is output from the system controller 31, the output of the tracking control circuit 29 becomes zero. Further, the jump control circuit 12 outputs an acceleration pulse.

A tracking error signal S obtained when a light spot crosses a track diagonally due to a jump.
TE changes sinusoidally as shown in FIG. The peaks and valleys of the sine wave coincide with the point in time when they pass the boundary of an adjacent track. However, the tracking error signal STE becomes zero while the light spot is passing through the mirror section 45, and the polarity is inverted before and after passing. As a result, the sine wave becomes discontinuous.

At the same time, the track seam detecting circuit (B) 18 detects the mirror portion 45 and issues a polarity inversion command S18.
Is output. The polarity inversion circuit 28 switches the polarity of the tracking error signal STE output from the tracking error signal generation circuit (B) 23 in accordance with the polarity inversion command S18 output from the track seam detection circuit (B) 18, and the tracking error signal after the polarity switching. S28 is output. The jump control circuit 12 is a control timing generation circuit (B) 19
Is activated by the control timing signal S19 output by the controller and discretely detects the tracking error signal S28. The phase of the control timing signal S19 with respect to the polarity inversion command S18 is set so that the value of the control timing signal S19 becomes zero during a predetermined time including when the polarity inversion command S18 changes. As a result, a substantially sinusoidal tracking error signal S28 'is captured as shown in FIG. Then, the jump control circuit 12 creates a track cross signal S12 based on the substantially sinusoidal tracking error signal S28 ', and counts the number of tracks jumped. When the counted number of tracks reaches the number specified by the system controller 31 or reaches a predetermined number, the tracking error signal S2 from the polarity inversion circuit 28 is output.
The deceleration pulse is output at the timing determined based on the level of 8 '.

When only one track is jumped, the number of tracks is not counted by the track cross signal, and the jump control circuit 12 outputs the tracking error signal S28 'from the polarity inversion circuit 28 immediately after outputting the acceleration pulse. The deceleration pulse is output at the timing determined based on the level of.

As described above, according to the present embodiment, the control timing generation circuit (B) 19 always performs a predetermined phase by the PLL control based on the polarity switching signal S18 output from the track seam detection circuit (B) 18. Since the related control timing signal S19 is output and the tracking control circuit 29 is activated by this, even if the tracking error signal STE becomes unstable in the mirror unit 45, the control does not become unstable. Further, in the jump operation, the tracking error signal S28 'sampled based on the control timing signal S19 whose phase is controlled.
Is used to generate the track cross signal S12, the erroneous track count is prevented, and the deceleration timing using the tracking error signal can be accurately detected. As described above, a stable jump operation can be realized.

In this embodiment, the track seam detection circuit (B) 18 directly detects the mirror section 45,
The present invention is not limited to such a configuration. For example, it is also possible to indirectly detect the mirror section 45 using an address or the like recorded in a track.

The configuration of the disk 2 is not limited to the configuration shown in FIG.

(Embodiment 4) FIG. 10 is a block diagram schematically showing a disk control apparatus according to Embodiment 4 of the present invention. The same components as those in FIGS. 1, 6, and 8 are denoted by the same reference numerals, and a duplicate description thereof will be omitted.

The optical disk 2 according to the present embodiment has the same configuration as those of the second and third embodiments.

In FIG. 10, reference numeral 16 denotes a hold signal generation circuit which outputs a hold signal S16 of a predetermined width (time) triggered by the polarity inversion command S18 output from the track seam detection circuit (B) 18. Reference numeral 20 denotes a hold circuit which, when the hold signal S16 is input from the hold signal generation circuit 16, holds the input signal from the polarity inversion circuit 28 for a predetermined time and outputs it.

The operation of the disk control device configured as described above will be described.

First, normal tracking control (on-track operation) will be described. Based on the reproduction signal from the optical pickup 22, the tracking error signal generation circuit (B) 23 generates a tracking error signal STE,
Output to the polarity inversion circuit 28. When detecting the mirror portion 45, the track seam detection circuit (B) 18 outputs a polarity inversion command S18. The polarity inversion circuit 28 switches the polarity of the tracking error signal STE based on the polarity inversion command S18. The tracking error signal S28 whose polarity has been switched is output to the hold circuit 20. Concurrently, upon receiving the polarity inversion command S18 from the track seam detection circuit (B) 18, the hold signal generation circuit 16 outputs a hold signal S16 for a predetermined time. Hold circuit 20
Receives the hold signal S16, holds the value of the tracking error signal S28 for a predetermined time, and outputs the tracking error signal S20 subjected to the hold processing. The tracking control circuit 29 is activated by the control timing signal S13 output from the timer circuit 13, takes in the tracking error signal S20, filters the tracking error signal S20 according to the instruction of the system controller 31, and drives the control signal thus obtained. Output to the circuit 33. As a result, the drive circuit 33 drives the actuator 34. As described above, when the mirror unit 45 is detected, the value of the tracking error signal S28 is held for a predetermined time and input to the tracking control circuit 29. Therefore, even if the light spot is passing through the mirror unit 45, the tracking error signal is output. No major disturbance occurs. As described above, the light beam can always trace on a continuous track. That is, tracking control of the optical disk in which the polarity of the tracking error signal changes every rotation can be stably performed.

Next, the jump operation will be described with reference to the timing chart of FIG.

When a jump command signal for a plurality of tracks is output from the system controller 31, the output of the tracking control circuit 29 becomes zero. Further, the jump control circuit 12 outputs an acceleration pulse.

A tracking error signal S obtained when a light spot crosses a track diagonally due to a jump.
TE changes sinusoidally as shown in FIG. The peaks and valleys of the sine wave coincide with the point in time when they pass the boundary of an adjacent track. However, the tracking error signal STE becomes zero while the light spot is passing through the mirror section 45, and the polarity is inverted before and after passing. As a result, the sine wave becomes discontinuous.

At the same time, the track seam detecting circuit (B) 18 detects the mirror section 45 and issues a polarity inversion command S18.
Is output. The polarity inversion circuit 28 switches the polarity of the tracking error signal STE output from the tracking error signal generation circuit (B) 23 in accordance with the polarity inversion command S18 output from the track seam detection circuit (B) 18, and the tracking error signal after the polarity switching. S28 is output. When receiving the polarity inversion command S18, the hold signal generation circuit 16 outputs a hold signal S16 for a predetermined time. When the hold signal S16 is input, the hold circuit 20 holds the value of the tracking error signal S28 for a predetermined time (hold period Th) and outputs it. When the hold signal S16 is not input, the tracking error signal S28 is output as it is. The jump control circuit 12 includes the timer circuit 1
3 is activated by a control timing signal S13 output by
The tracking error signal S20 subjected to the hold processing output from the hold circuit 20 is discretely detected. As a result,
The tracking error signal S20 '(not shown) taken into the jump control circuit 12 has a substantially sinusoidal shape. The jump control circuit 12 generates the tracking error signal S
A track cross signal S12 is generated based on 20 ', and the number of jumped tracks is counted. Then, when the counted number of tracks reaches the number specified by the system controller 31 or reaches a predetermined number, a deceleration pulse is output at a timing determined based on the level of the tracking error signal S20 '.

When only one track is jumped, the number of tracks is not counted by the track cross signal, and the jump control circuit 12 determines immediately after the output of the acceleration pulse based on the level of the tracking error signal S20 '. The deceleration pulse is output at the specified timing.

As described above, according to this embodiment, the polarity inversion command output from the track seam detection circuit (B) 18
By generating a hold signal S16 having a predetermined time width with respect to S18 and performing tracking control using a signal S20 obtained by holding the output signal S28 of the polarity inversion circuit 28, a tracking error signal used for control is reduced. Control becomes stable without becoming unstable. Further, in the jump operation, the track cross signal S12 is generated using the tracking error signal S20 subjected to the hold processing, so that the track count is not erroneously detected, and the deceleration timing using the tracking error signal is also reliably detected. it can. As described above, a stable jump operation can be realized.

In the present embodiment, the mirror portion 45 is directly detected by the track seam detecting circuit (B) 18, however,
The present invention is not limited to such a configuration. For example, it is also possible to indirectly detect the mirror section 45 using an address or the like recorded in a track.

In the above description, the jump control circuit 12 creates the track cross signal S12 based on the tracking error signal S20 '. However, the jump control circuit 12 creates the track cross signal S12 based on the tracking error signal S20. You can also.

The configuration of the disk 2 is not limited to the configuration shown in FIG.

In the first to fourth embodiments,
Although the output timing of the deceleration pulse at the end of the jump is determined by the level of the tracking error signal taken into the jump control circuit, the present invention is not limited to such a configuration. For example, the output timing of the deceleration pulse at the end of the jump can be determined using a signal obtained by differentiating the tracking error signal. Alternatively, a method of outputting a deceleration pulse after a predetermined time has elapsed after the output of the acceleration pulse may be employed.

[0082]

As described above, according to the present invention, a disk control device capable of performing stable on-track operation and jump operation can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram schematically showing a disk control device according to a first embodiment of the present invention.

FIG. 2 is an enlarged view showing a configuration of sample servo pits formed on the optical disc according to the first embodiment of the present invention.

FIG. 3 is a conceptual diagram illustrating a method of generating a tracking error signal output by the tracking error signal generation circuit according to the first embodiment of the present invention.

FIG. 4 is a timing chart showing various signals during an on-track operation in the disk control device according to the first embodiment of the present invention.

FIG. 5 is a timing chart showing various signals at the time of a jump operation in the disk control device according to the first embodiment of the present invention.

FIG. 6 is a configuration diagram schematically showing a disk control device according to a second embodiment of the present invention.

FIG. 7 is a timing chart showing various signals at the time of a jump operation in the disk control device according to the second embodiment of the present invention.

FIG. 8 is a configuration diagram schematically showing a disk control device according to a third embodiment of the present invention.

FIG. 9 is a timing chart showing various signals at the time of a jump operation in the disk control device according to the third embodiment of the present invention.

FIG. 10 is a configuration diagram schematically showing a disk control device according to a fourth embodiment of the present invention.

FIG. 11 is a timing chart showing various signals at the time of a jump operation in the disk control device according to the fourth embodiment of the present invention.

[Explanation of symbols]

 1, 2 optical disk 10 track joint detection circuit (A) 11 control timing generation circuit (A) 12 jump control circuit 13 timer circuit 14 mask circuit 15 mask signal generation circuit 16 hold signal generation circuit 17 tracking error signal generation circuit (A) 18 Track joint detection circuit (B) 19 Control timing generation circuit (B) 20 Hold circuit 22 Optical pickup 23 Tracking error signal generation circuit (B) 28 Polarity inversion circuit 29 Tracking control circuit 31 System controller 33 Drive circuit 34 Actuator 40 Clock pit 41 First wobble pit 42 Second wobble pit 43 Address pit 44 Sample point of sample servo 45 Mirror part 51 Moving direction of light beam spot

Claims (5)

[Claims] An optical disc having a recording surface on which continuous tracks formed by alternately connecting tracks having different configurations and a marking for determining a control timing disposed at a predetermined position with respect to a connecting portion of the tracks. A disc control device for recording information and / or reproducing the recorded information, comprising: a light detection unit that irradiates light to a recording surface of the optical disc and detects a reflected light thereof; Moving means for moving in a direction orthogonal to the optical axis; tracking error signal generating means for generating a tracking error signal based on the output of the light detecting means; and a track connection portion based on the output of the light detecting means And a polarity control means for outputting a polarity inversion command, and inverting the polarity of the tracking error signal based on the polarity inversion command. Gender inversion means, control timing signal generation means for outputting a control timing signal based on the marking, and an output signal of the polarity inversion means based on the control timing signal, and controlling the moving means to perform an on-track operation Tracking control means for performing a jump operation by taking in an output signal of the polarity inversion means based on the control timing signal and controlling the moving means in accordance with a track jump instruction. Disk controller. 2. A disk control device for recording information on and / or reproducing recorded information on an optical disk having a recording surface on which a continuous track in which tracks having different configurations are alternately connected is formed. Light detecting means for irradiating the recording surface of the optical disc with light and detecting reflected light thereof; moving means for moving the light detecting means in a direction orthogonal to the optical axis; and an output of the light detecting means. A tracking error signal generating unit that generates a tracking error signal based on the output signal; a polarity control unit that detects a connection portion of the track based on an output of the light detection unit and outputs a polarity inversion command; Polarity inverting means for inverting the polarity of the tracking error signal; timer means for outputting a timing signal of a predetermined period; A mask signal generating means for outputting a mask signal for a predetermined time based on the mask signal; a mask means for masking the timing signal based on the mask signal; and a polarity inverting means based on the timing signal masked by the mask means. A tracking control unit that captures an output signal, controls the moving unit to perform an on-track operation, and captures an output signal of the polarity inversion unit based on a timing signal masked by the masking unit, and according to a track jump instruction, A disk control device comprising: a jump control means for performing a jump operation by controlling a moving means. 3. The disk control device according to claim 2, wherein said timer means is reset when the mask signal output from said mask signal generation means ends. 4. A disk control device for recording information on and / or reproducing recorded information on an optical disk having a recording surface on which a continuous track on which tracks having different configurations are alternately connected is formed. Light detecting means for irradiating the recording surface of the optical disc with light and detecting reflected light thereof; moving means for moving the light detecting means in a direction orthogonal to the optical axis; and an output of the light detecting means. A tracking error signal generating unit that generates a tracking error signal based on the output signal; a polarity control unit that detects a connection portion of the track based on an output of the light detection unit and outputs a polarity inversion command; Polarity inverting means for inverting the polarity of the tracking error signal; and a control for outputting a control timing signal having a predetermined phase relationship with the polarity inversion command. A control timing signal generating unit, a tracking control unit that captures an output signal of the polarity inversion unit based on the control timing signal, controls the moving unit to perform an on-track operation, and the polarity based on the control timing signal. A disc control device comprising: a jump control unit that receives an output signal of the inversion unit, controls the moving unit in accordance with a track jump instruction, and performs a jump operation. 5. A disk control device for recording information on and / or reproducing recorded information on an optical disk having a recording surface on which a continuous track in which tracks having different configurations are alternately connected is formed. Light detecting means for irradiating the recording surface of the optical disc with light and detecting reflected light thereof; moving means for moving the light detecting means in a direction orthogonal to the optical axis; and an output of the light detecting means. A tracking error signal generating unit that generates a tracking error signal based on the output signal; a polarity control unit that detects a connection portion of the track based on an output of the light detection unit and outputs a polarity inversion command; A polarity inverting means for inverting the polarity of the tracking error signal; and an output signal from the polarity inverting means for a predetermined time based on the polarity inversion command. Hold means for holding and outputting a timing signal; a timer means for outputting a timing signal of a predetermined period; and a tracking means for taking in an output signal of the hold means based on the timing signal and controlling the moving means to perform an on-track operation. A disk control device comprising: a control unit; and a jump control unit that fetches an output signal of the hold unit based on the timing signal and controls the moving unit in accordance with a track jump instruction to perform a jump operation. .