JP2867236B2 - Optical disk recording medium and optical disk device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a physical format of a zone CLV / CAV of an optical disk capable of high-density recording, and a rotation control and recording laser modulation circuit of an optical disk device for recording / reproducing the optical disk.

[0002]

2. Description of the Related Art In recent years, technical development related to high density optical discs has been actively pursued. In this technical field, in order to increase the areal recording density, the track pitch is reduced to cope with the problem. For example, CD (compact disk)
Is 1.6 μm, whereas the next-generation DVD (Digital Video Disk) has a track pitch of 0.74 μm, which is less than half of that. As a method for realizing a DVD-RAM disc which is a rewritable type of DVD, a recording mark conventionally recorded only on the guide groove (groove) for tracking or only between the guide grooves (land) is replaced with a groove. By recording on both lands,
A “land and groove” recording method has been developed in which a double recording density can be obtained with the same groove pitch as in the past.

By the way, CD has a constant linear velocity (CLV).
Thus, a recording pit is formed. Reproduction of a CD in this case is relatively simple because it is sufficient to control the number of rotations of the rotary motor so that the reproduction frequency of the recording pits becomes constant. However, when recording on a recordable disc, CLV control is difficult because there is generally only a groove before recording. Therefore, the groove is meandered (wobbled) in the disk radial direction at a constant spatial frequency,
In rotation control during data recording, a method has been developed in which rotation control is performed so that the frequency of the meandering signal is constant. This method is used for a recordable CD (CD-R), a mini disc (MD), and the like.

However, in the case of the above-mentioned "land and groove" recording method, since the groove meander signal cannot be obtained on the land, the rotation cannot be controlled. As one method for solving such a problem, an apparatus has been proposed in which the meandering frequency of grooves on both sides of a land is changed, and rotation control is enabled by detecting the two frequencies (Japanese Patent Application Laid-Open No. HEI 9-208572). 6-338066). However, in this case, on the land, the meandering signal of the groove on each side is actually very small in amplitude.
Difficult to detect. In connection with this device, a technique has been proposed in which the meandering frequency of the groove is frequency-modulated to give (insert) address information. However, as described above, it is difficult to detect even the center frequency of the meandering frequency of the groove on the land, and thus it is more difficult to detect the frequency-modulated address information.

[0005] Furthermore, as another technique, the meandering of the groove is not mentioned, but if address information is preliminarily carved as a pre-pit between the land and the groove,
There has also been proposed a device in which address information can be obtained from both lands and grooves (Japanese Patent Laid-Open No. 6-17640).
No. 4). However, the method of CLV rotation control is not described. Of course, it is possible to attach a rotary encoder with a certain degree of precision to the rotary motor and perform CLV control with a signal from this encoder, but such encoders have the disadvantage of high cost.

Although it is possible to control the rotation based on the frequency of the reproduced signal of the address pit, the rotation control information can be obtained only discretely since the address areas are arranged discretely. Difficult to control, precise. In addition, at the time of random access, it is necessary to quickly adjust the linear velocity. However, since control information is discrete, there is a problem that high-speed shift control is difficult. On top of that, there are two spirals, a land track and a groove track. Therefore, address management different from that of a ROM-type disk composed of one spiral is required, which increases the cost of the apparatus. Not ROM
Another drawback is that compatibility with the disc is reduced.

Next, as another technique, a zone CAV (Z
CAV = MCAV) and zone CLV (ZCLV = MCL)
V) system is also known (for example, see
No. 114733). Both are the same in disk format, and the device side uses CAV over the entire circumference.
There is only a difference between rotating at a constant angular velocity (constant angular velocity) or reducing the rotational speed of the outer peripheral zone to substantially CLV (constant linear velocity), and both are CAV within each zone. Since the linear velocity of the ZCAV is higher toward the outer periphery, the recording conditions such as the laser power and the recording pulse waveform cannot be made the same over the entire circumference, and the apparatus cost increases due to the provision of the switching circuit and the like. Further, depending on the composition of the recording layer of the recording medium, if the linear velocity is different, there is a problem that the recording itself may not be performed.

[0008] ZCLV is a preferable method because it is ideal for forming recording marks and does not require continuous rotation control unlike CLV. However, since the number of revolutions must be changed for each zone, control is more difficult than CAV. If this rotation control is performed by a rotary encoder (the above-mentioned Japanese Patent Application Laid-Open No. Hei 7-114733), the cost is increased as described above. Although a method using address pits is also possible, in this case, there is a problem in high-speed shift control at the time of access as described above.

[0009]

[Problems to be solved by the invention]
The disk of the "groove" recording method can perform high-density recording, but has a problem that rotation control cannot be performed because a meandering signal of the groove cannot be obtained on the land. As one method of solving this problem, the inventor of the present application forms a track spiral with one track, replaces the land and the groove for each round, and controls the rotation with a meandering signal of the groove during the round of the groove. A device for maintaining the rotation control during the orbit of the land was proposed (Japanese Patent Application No. 7-178).
No. 049). However, this apparatus can provide good results for a disc composed of one track spiral, but in the case of a disc in which the groove spiral and the land spiral are independent and two track spirals are formed. Is not taken into consideration, so that there is a problem that rotation control cannot be performed on the land.

[0010] It is an object of the present invention to realize ZCLV rotation control for an optical disk having spiral or concentric recording tracks without using an expensive rotary encoder, thereby enabling precise and high-speed shift control. (The invention of claims 1 to 7). Further, ZCLV rotation control is enabled even on a land (the inventions of claims 1 to 7). It is another object of the present invention to eliminate the need for an expensive rotary encoder, facilitate the generation of a recording signal, and increase the access speed.

[0011]

According to a first aspect of the present invention, there is provided an optical disk recording medium having a spiral or concentric recording track, wherein the recording track has at least a part of a guide groove, and the recording medium has an information recording surface. The area is divided into a plurality of zones in the radial direction, and the guide groove radially extends at a predetermined frequency according to each zone in each of the plurality of zones when the recording medium is rotated at a constant angular velocity. It is meandering, and the spatial frequency of the meandering is substantially constant for each zone.

According to the optical disk recording medium of the second aspect, in the optical disk recording medium of the first aspect, the recording track comprises:
A turn having a guide groove and a turn having no guide groove are alternately formed for each turn of the spiral.

According to a third aspect of the present invention, in the optical disk recording medium of the first or second aspect, the recording track has an address information area composed of a series of intermittent pits, and the address information area has a circumference in each zone. They are arranged at predetermined angular intervals in the direction, and are arranged at a substantially constant spatial distance in each zone.

According to a fourth aspect of the present invention, in the optical disk recording medium of the first or second aspect, the guide grooves meander in the radial direction by modulating the address information to a predetermined meandering frequency.

According to a fifth aspect of the present invention, in order to record / reproduce information by using the optical disk recording medium of the first aspect, the optical disk recording medium has a constant meandering frequency obtained from the guide groove. Is provided with rotation control means for controlling the number of rotations.

According to a sixth aspect of the present invention, in the optical disk device of the fifth aspect, since the information is recorded / reproduced using the optical disk recording medium of the third aspect, the meandering frequency of the guide groove cannot be obtained. Is provided with a rotation control means for obtaining a rotation control signal from the address information area and controlling the rotation speed of the optical disk recording medium.

According to a seventh aspect of the present invention, in the optical disk device of the fifth aspect, access means for moving the light beam from the current recording track to another recording track is provided, and the rotation control means is provided with a separate means for moving the light beam. When there is no guide groove in the recording track, the number of rotations of the optical disc recording medium is controlled so that the meandering frequency of the guide groove obtained from the recording track having the guide groove in the vicinity thereof is constant.

According to an eighth aspect of the present invention, in order to record / reproduce information using the optical disk recording medium of the first aspect, the optical disk apparatus is provided with a rotation control means for rotating the optical disk recording medium at a constant angular velocity and a guide groove. Recording means for recording recording data on a recording track at a recording frequency corresponding to the meandering frequency.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an optical disk recording medium and an optical disk apparatus according to the present invention will be described in detail with reference to the drawings.

First Embodiment The first embodiment mainly corresponds to the invention of claim 1, but the invention of the optical disk recording medium of claims 2 to 4, and this optical disk recording medium The invention also relates to the inventions of the optical disk devices according to claims 5 to 8 which use the following. The invention of claim 1 is a basic invention. This first
In the embodiment of the present invention, an expensive rotary encoder is unnecessary, and Z
The first feature is to provide an optical disk recording medium that realizes CLV rotation control, enables precise and high-speed shift control, and enables ZCLV rotation control even on a land. Further, the optical disk recording medium has a second feature in that an expensive rotary encoder is not required, a recording signal is easily generated, and an access time can be shortened. (The invention of claim 1). First, the optical disk recording medium of the present invention will be described.

FIG. 1 is a diagram conceptually showing an example of an embodiment of a zone division and a structure of a recording track of an optical disk recording medium of the present invention, wherein (1) is a front view, and (2) is an optical disk recording medium. It is a partially enlarged view of a medium. In the figure,
1 is an optical disk recording medium, 2 is a recording track, G is a groove (guide groove), L is a land (between the guide grooves), Z1 to Z1.
Zn indicates a zone (area), A indicates a partial area of the optical disc recording medium 1, and B indicates a rotation center position of the optical disc recording medium 1.

The optical disk recording medium 1 shown in FIG.
Have concentric recording tracks. The optical disc recording medium 1 according to the present invention has n zones (regions) Z1, Z2, Z from the inner peripheral side to the outer peripheral side of the rotation center position B.
,..., Z (n-1), and Zn. Each of the zones Z1 to Zn has a groove (guide) for obtaining a tracking error signal necessary for the optical head to scan the recording track 2 as shown in a partially enlarged view in FIG. Many grooves (G) are formed. The groove G may be a large number of concentric circles as shown in FIG. 1A, a single spiral, or may be formed every other spiral.

As a recording method, data can be recorded using only the groove G as a recording track, or between the grooves (guide grooves) G, that is, lands (between the guide grooves). It is also possible to record data in both the groove G and the land L by using L together. The groove pitch in this case is, for example, about 1.5 μm, and the groove G meanders in the radial direction by a small amount. It is preferable that the meandering amplitude is, for example, about 0.03 μm, which is sufficiently smaller than the groove pitch so as not to affect the original tracking. The repetition frequency of such a meandering is set such that when the optical disc recording medium 1 is rotated at a constant angular velocity (CAV), the frequency becomes higher in the zone on the outer peripheral side, and within the same zone. Set the frequency to be constant.

The spatial frequency (the number of times of meandering per unit line length) is set to be substantially constant in all zones. For example, the spatial frequency of the innermost groove in each zone is equal in all zones. This spatial frequency is preferably set to a frequency sufficiently higher than the tracking servo band (generally several KHz) when actually rotating at the recording rotational speed so as not to affect the original tracking. .
For example, if a repetition frequency of 30 KHz is obtained when rotating at a linear velocity of 4 m / s, the spatial frequency is 4
* 30,000 = 120,000 (cycle / s), and the length of one cycle is 1 / 120,000 = 8.33.
μm. Here, with respect to the optical disk recording medium 1 described with reference to FIGS.
The relationship between the meandering spatial frequency and the rotation speed will be described.

FIG. 2 shows the optical disk recording medium shown in FIG.
1 shows an example of the relationship between the frequency and the rotation speed for each zone
In the figure, (1) is the radial direction of the recording medium 1.distance(R) and Reproduction Snake
Row frequency (fw), (2) is the radial direction of the recording medium 1distance
(R) and meandering spatial frequency (fsw), (3) indicates recording medium 1
Radial direction ofdistance(R) and the number of rotations (w)
FIG.

First, as for the spatial frequency, as shown in FIG. 2B, the angular velocity is constant (CAV) in the same zone.
The meandering spatial frequency (fsw) decreases toward the outer circumference so that a constant frequency is obtained when rotating at. When such an optical disc recording medium 1 is rotated at a constant angular velocity, the reproduction frequency obtained from the meandering becomes, as shown in FIG.
w) increases. Therefore, the reproduction meander frequency (fw)
Is constantly kept constant, the rotation speed (w) at that time is constant in the zone and becomes lower in the outer peripheral zone as shown in FIG. 2 (3).

As described above, in the first embodiment, in the optical disk recording medium 1 having a spiral or concentric recording track, the recording track 2 has at least a part of the guide groove G. The information recording area is divided into a plurality of zones Z1 to Zn in the radial direction. When the recording medium 1 is rotated at a constant angular velocity, the guide groove G is formed as shown in FIGS. 2 (1) to 2 (3). ~ Zn,
In each of the plurality of zones, meandering in the radial direction is performed at a predetermined frequency corresponding to each zone, and the spatial frequency of the meandering is substantially constant for each zone as shown in FIG. 2 (2). is there.

Therefore, the so-called zone CLV (ZC
LV or MCLV) can be easily realized. Further, a conventional rotary encoder or the like is not required. By the way, since it is difficult to reproduce the groove meandering signal in the land L, the tracking is performed by the groove G in the vicinity to detect the meandering signal, and after performing the rotation control with this signal, the signal is moved to the desired land L. Since the number of rotations is also determined for the land L, ZCLV is possible. The reason is that since the angular velocity is constant (CAV) in the zone, complicated control is not required. As will be described later in detail, if the address information (ID) is formed as pre-pits, the land can perform rotation control by obtaining a control signal for rotation from the address information (ID). , Further simplification is realized (the invention of claims 3 and 6).

Generally, the groove meandering frequency is much higher than the address information (ID) detection repetition frequency, so that it is possible to set a larger number of pulses for frequency detection. Therefore, a more precise rotation control can be performed by a method of detecting the groove meandering frequency and performing the rotation control as compared with a method of performing the rotation control by a signal from the address information (ID). In addition, since high-bandwidth control is also possible, high-speed rotation pull-in can be performed at the time of access, and the access time can be shortened (the invention of claim 7 ).

Second Embodiment The second embodiment corresponds to the second and third aspects of the present invention, but also relates to the optical disc recording medium of the first aspect. In the first embodiment, in an optical disk recording medium having one spiral or concentric recording track, a recording medium provided with land and groove recording tracks, so-called “land & groove” recording The method has been described. In the second embodiment, in the optical disk recording medium provided with the recording tracks of the “land & groove” system described above, the recording tracks have grooves (guide grooves) for each spiral. The first feature is that the circuit and the circuit having no groove are alternately formed (the invention of claim 2). In addition, the recording track according to the first embodiment (the invention of claim 1) and the recording track (the invention of claim 2) in which a turn with and without a groove is alternately formed for each turn of the spiral. An address information area consisting of intermittent pit rows is provided, and the address information areas are arranged at predetermined angular intervals in a circumferential direction in each zone, and are arranged at a substantially constant spatial distance in each zone. Has the second feature (the invention of claim 3).

FIG. 3 is an enlarged view of a main part conceptually showing an example of an embodiment of a spiral structure of a recording track of the optical disk recording medium of the present invention. The reference numerals in the figure are the same as those in FIG. 1, ID indicates address information, and m indicates a recording track.

As shown in FIG. 3, on the optical disk recording medium 1 shown in FIG. 1, after the rotation of the groove G, the rotation of the land L is performed, and the next rotation is the rotation of the groove G again. That is, the groove G is formed every other turn on one spiral wire. The meandering of the groove G in this case is similar to the case shown in FIGS. 1 and 2 above, and ZCLV can be made by detecting the meandering frequency. As described above, according to the land and groove system using one spiral, since the number of spirals is one, RO
Since the same address management and file management as those of the M disk (one spiral in the entire prepit) can be performed, compatibility can be improved (the invention of claim 2).

On the optical disk recording medium 1 shown in FIG. 3, address information (ID part) using pre-pits is provided.
Are formed intermittently. This ID is, as in the case of the meandering frequency of the groove, when rotating at a constant angular velocity,
In the same zone, a predetermined angular interval (for example, 10
), And the innermost track of each zone has the same distance in the linear direction. Therefore, the angular interval is shorter in the outer peripheral zone (for example, 20 in the outermost zone in the outermost zone). In FIG. 3, the IDs are arranged on an intermediate line between the land and the groove, and a common ID is reproduced between the land scan and the groove scan so that address information can be obtained (the invention of claim 3).

The optical disk recording medium 1 shown in FIG. 3 will be briefly described. FIG. 3 shows a part of a recording track in which grooves G and lands L are alternately arranged, and a track is formed by one spiral. Then, the groove G and the land L are switched (G / L switching or L / G switching) at the position of the ID (the boundary of one round) shown below. That is, the position of the groove G up to that point becomes the land L, and conversely, the position of the land L becomes the groove G.
Therefore, the lower part from this position is the beginning of one round of the recording track, and the upper part is the end of one round.

For example, the recording track (m + 1) on the upper right side of FIG. 3 is a groove G, and the groove G is arranged up to the position above the position of the ID (one boundary) across the address information part ID. , Here is the end. Then, the next recording track (m + 2) is formed by the groove G with the start end below the position of the ID (boundary of one round). I
By arranging D in this way, the ID pit can be carved under the same conditions (width and depth) as the carving of the groove, so that it is possible to easily cut the master. Can be

When the cutting precision is high, independent ID pits can be arranged in each of the groove and the land (not shown). In this case, unique addresses can be assigned to all IDs in address management, so that more accurate address management is possible. In the above embodiment, as shown in FIG. 1, the case where the land and the groove are arranged by one spiral on the optical disk recording medium 1 (the invention of claim 2) has been described. However, the present invention can be similarly applied to a case where a recording track is provided by a total of two spirals, one groove spiral and one land spiral over the entire circumference of the optical disk recording medium 1. In this case, in terms of address management, compatibility with a ROM disk (one spiral with a whole pre-pit) is slightly lowered, but it is not necessary to frequently switch between groove scanning and land scanning. Becomes easier.

Third Embodiment Although the third embodiment corresponds to the invention of claim 4, it also relates to the invention of the optical disk recording medium of claims 1 and 2. In the third embodiment, in the optical disk recording medium according to the first or second aspect described above, the groove (guide groove) meanders in the radial direction by modulating the address information to a predetermined meander frequency. Is characterized by the fact that

FIG. 4 is a time chart conceptually showing an example of a waveform of a meandering signal by a groove and a detection signal of the signal on the optical disk recording medium of the present invention. "1" and "0" at the bottom of the figure indicate detection signals.

In the third embodiment, the frequency modulated address information is superimposed on the meandering frequency of the groove. For example, if the center frequency is 30KHz,
Rotation control is performed according to this frequency, and frequency modulation is performed at ± 1 KHz. In this case, meandering signals of 31 KHz and 29 KHz are reproduced.
If "0" is set in the case of 29 KHz, a detection signal as shown in the lower part of FIG. 4 is obtained. As described above, if the address information is superimposed on the meandering of the groove by frequency modulation, the ID by the pre-pit becomes unnecessary. For detecting the meandering signal, a known tracking error signal detecting optical system and circuit such as a push-pull method may be used as it is.

Fourth Embodiment The fourth embodiment corresponds to the inventions of claims 4 to 7, but also relates to the inventions of the optical disk recording media of claims 1 to 4. doing. The fourth embodiment is an optical disk apparatus for recording / reproducing information by using the optical disk recording medium described in the first to third embodiments, and is compatible with the optical disk recording medium. It is characterized in that it is controlled by the number of rotations.

FIG. 5 is a functional block diagram showing an example of an embodiment of a main part configuration of the optical disk device of the present invention. In the figure, 11 is an optical disk recording medium,
12 is a rotation motor, 13 is an objective lens, 14 is an optical head, 15 is a feed motor, 16 is a tracking error signal detection circuit, 17 is a polarity switching circuit, 18 is a tracking servo circuit, 19 is a first selector, and 20 is a band. A pass filter, 21 is a first comparator, 22 is a second comparator,
23 is a high frequency signal detection circuit, 24 is an ID detection circuit, 25
Is a rotary servo circuit, 26 is a frequency comparator, 27 is a second selector, 28 is a third selector, 29 is a first frequency oscillator, 30 is a second frequency oscillator, 31 is a controller, and TE is tracking. An error signal, tzc is a track crossing pulse, Add is address information, wbl is a wobble signal, IDpu is a pulse signal indicating that an ID part is detected, jump is a jump drive signal, and open is a control signal.

In FIG. 5, the optical disk recording medium 1
1 has groove meandering for each zone in which ZCLV is possible, as described with reference to FIGS. FIG.
May have an ID section corresponding to ZCLV. The operation of the optical disk device of FIG. 5 is as follows. The rotation motor 12 rotates the optical disk recording medium 11 according to a rotation command of the rotation servo circuit 25. The objective lens 13 focuses a laser beam emitted from a known optical system included in the optical head 14 on the recording surface of the optical disk recording medium 11.

The objective lens 13 can be slightly displaced in the radial direction, and is driven in the radial direction by a drive signal from the first selector 19 to make the light beam follow the track or to move from one track to another track. It has a jump function. The reflected light of the light beam condensed on the recording surface is detected by a known detection optical system provided in the optical head 14 and photoelectrically converted. The photoelectrically converted electrical signal from the optical head 14 is supplied to a tracking error signal detection circuit 16 to generate a tracking error signal TE. This electric signal is also supplied to the high-frequency signal detection circuit 23 at the same time, and a data signal is also generated.

The optical head 14 can be moved in the radial direction of the disk by a feed screw which operates in response to the drive of the feed motor 15. And the feed motor 15
Is driven by a feed command from the controller 31. The tracking error signal TE is input to the polarity switching circuit 17. This polarity switching circuit 17
The polarity of the tracking error signal TE is switched by a groove / land switching command from the controller 31. That is, the polarity is reversed between when tracking the land and when tracking the groove. The output of the polarity switching circuit 17 is input to a tracking servo circuit 18.

The tracking servo circuit 18 performs appropriate phase compensation and gain compensation, and outputs a servo drive signal to the first selector 19. This first selector 19
Three states can be selected by a tracking select command from the controller 31. The first is a case where the objective lens 13 is driven according to the tracking error signal TE and the light beam tracks on the groove or land. A servo drive signal is given from the controller 31. The second is to move the objective lens 13 from the current track to another track.
A jump drive signal jump is given from 1 and the objective lens 13 is directly driven by the controller 31. This jump drive signal is output when the objective lens 13 is caused to jump to an adjacent track. Third, the objective lens 13 is not driven and is stopped. In this case, the control signal open is supplied to the first selector 19. In this state, move the entire optical head,
Is a case where the access of the long distance.

The tracking error signal TE is also input to the band pass filter 20. As described above, since the groove meandering is smaller than the groove pitch, the amplitude of the detection signal also becomes smaller. Therefore, S / N
This band pass filter 20 is used to increase. The output of the band-pass filter 20 is zero-cross sliced by the first comparator 21 and binarized to generate a wobble signal wbl. This wobble signal w
bl is sent to the second selector 27. The output of the high-frequency signal detection circuit 23 is sent to the ID detection circuit 24.

The ID detection circuit 24 detects the information of the ID portion where the address information is recorded by the pre-pit. The output is sent to the controller 31 as address information Add, and a pulse signal IDpul indicating that the ID portion has been detected is sent to the second selector 27.
This pulse signal IDpul is set to 1 every time the ID section is detected.
Pulse output. The second selector 27 is switched by a G / L switching command from the controller 31. Then, the signal wbl is selected for the groove, and the pulse IDpul is selected for the land, and the selected signal is sent to the frequency comparator 26.

On the other hand, the first frequency oscillator 29 and the second frequency oscillator 30 oscillating two kinds of frequencies output signals having target frequencies to be compared with the signal wbl and the pulse signal IDpul, respectively. These outputs are selected by the third selector 28 and output from the frequency comparator 2
Sent to 6. This process is because the repetition frequency of the signal wbl and the pulse signal IDpul are generally different. By switching between the first frequency oscillator 29 and the second frequency oscillator 30, the rotation can be controlled by either ID detection or meandering signal, which is convenient.

The third selector 28 is also connected to the controller 31
Is switched according to a G / L switching command from. In the case of the groove, the output of the first frequency oscillator 29 for the signal wbl is used. In the case of the land, the output of the pulse signal ID is used.
selecting the output of the second frequency oscillator 30 for pu,
The signal is sent to the frequency comparator 26. The frequency comparator 26 has 2
The two input frequencies are compared and a signal corresponding to the difference is output. This signal is supplied to the rotation servo circuit 25. The rotation servo circuit 25 amplifies the frequency difference signal and sends it to the rotation motor 12 as a rotation drive signal. In this case, in order to reduce the steady-state rotational speed deviation, it is preferable to integrate the frequency difference and sufficiently increase the low-frequency gain. With the above operation, when the G / L switching command is a groove, the groove meandering frequency is compared with the target frequency, and the rotary motor 12 is driven according to the comparison result. Thus, the rotation speed is controlled (the invention of claim 5).

In a land, it is difficult to obtain a meandering signal from a groove. Therefore, when the G / L switching command is set to a land, the ID detection repetition frequency is compared with the target frequency, and the rotary motor 12 is driven according to the comparison result. The rotation speed is controlled so that the frequency becomes constant (the invention of claim 6). In addition, the tracking error signal T
E is also input to the second comparator 22. Here, it is zero-cross sliced and binarized to become a track crossing pulse tzc, which is input to the controller 31. The controller 31 can count the number of tracks of the optical head 14 moved by the feed motor 15 by counting the track crossing pulse tzc.

As described above, in the fourth embodiment, in order to record / reproduce information using the optical disk recording medium of the first aspect, the meandering frequency obtained from the groove is constant. Is provided with a rotation control means for controlling the number of rotations of the optical disk recording medium (the invention of claim 5). In addition, this rotation control means, in the apparatus of FIG.
Tracking error signal detection circuit 16, band-pass filter 20, first comparator 21, first frequency oscillator 29,
It is constituted by a frequency comparator 26, a rotation servo circuit 25, and the rotation motor 12. Therefore, the rotation can be controlled based on the meandering frequency with a simple configuration, so that a precise and high-speed zone CL can be performed without expensive components such as an encoder.
V becomes possible, and after the rotation control in the groove, the process shifts to the land tracking, so that the zone CLV rotation control is executed substantially on the land.

In order to record / reproduce information using the optical disk recording medium of the third aspect, when the meandering frequency of the groove cannot be obtained, a rotation control signal is obtained from the address information area to record the information on the optical disk. A rotation control means for controlling the number of rotations of the medium is provided (the invention of claim 6). In the apparatus shown in FIG. 5, the rotation control means includes a high-frequency signal detection circuit 23, an ID detection circuit 24, a second frequency oscillator 30, a frequency comparator 26, a rotation servo circuit 25, and the rotation motor 12. . Therefore, with a simple configuration, address management is facilitated, and rotation control on the land can be performed based on the address information area, so that more precise rotation control can be performed.

Fifth Embodiment The fifth embodiment corresponds to the seventh aspect of the present invention, but is directed to an optical disk recording medium according to the first to fourth aspects and an optical disk apparatus according to the fifth aspect. It also relates to the invention.

FIG. 6 is a flowchart showing a main processing flow of an operation for accessing a light beam from one track to another track in the optical disk apparatus of the present invention. In the figure, # 1 to # 10 indicate steps.

FIG. 6 shows an algorithm in a case where recording tracks are sequentially numbered using both lands and grooves, and the recording track number TGT is moved to a seek position. It is executed by the control of. In step # 1, the track number CUR where the optical head 14 is currently located and the target track number TGT
Find the difference between This difference N indicates the number of tracks to be moved. In the next step # 2, the target track number T
It is determined whether or not GT is a groove. Since the track number is a serial number, it can be determined based on, for example, whether the track number is even or odd. If the target track number TGT is not a groove (if it is a land), the process proceeds to step # 3.

In step # 3, the optical head 14 is
Move by the number of tracks of 1. In this case, since the target track number TGT is a land track, the track is moved to a track immediately before the target track number TGT, that is, a groove track. When such a plurality of tracks are moved, in the apparatus shown in FIG. 5, the first selector 19 selects the control signal open to turn off the tracking servo, and outputs a fingering command to the feed motor 15 to output the optical head. 14 is moved and the number of moving tracks is counted by the track crossing pulse tzc.
A seek operation is performed. In this embodiment, since the land and the groove are sequentially numbered and the track number is set, both the rising and the falling of the track crossing pulse tzc are counted, and the feeding operation is performed when the counted value becomes N-1. To stop. In the next step # 4, the land / groove switching command is set to groove, and the tracking servo is turned on. Then, when the tracking servo circuit 18 is turned on, the rotation control is performed by comparing the groove meander signal wbl with the output frequency from the first frequency oscillator 29. Therefore, as described above, since the number of comparison pulses is large, high-speed control is possible.

In step # 5, the control waits for the rotation control to settle.
In this case, for example, it may be monitored that the frequency comparison result is close to “0” (not shown), or if the settling time is set in advance by design, it can be realized by simply waiting for time. it can. When the rotation control is settled, in the next step # 6, a jump is made by +1 track to move to the original target track TGT. In this state, since the rotation control is settled, it is sufficient to simply perform a jump of one track. Jump is the first selector 1
In step 9, a jump command is selected and a pulse is given as the jump command.

In step # 7, the land / groove switching command is set to the land, and the tracking servo is turned on. By this operation, the rotation control is performed by the ID detection pulse ID.
This is performed by comparing pu and the output frequency from the second frequency oscillator 30. In this case, the control speed cannot be increased, but since the rotation control is already established in the adjacent groove, it is sufficient to control the disturbance. On the other hand, if the target track number TGT is a groove in the determination in the previous step # 2, the process proceeds to step # 8. In step # 8, the optical head 14 is moved by the number of tracks of the difference number N. The operation in this case is the same as that in step # 3, except that the operation is directly moved to the target track number TGT. Next, proceeding to step # 9, the land / groove switching command is set to groove,
Turn on the tracking servo. In this case,
This is the same as step # 4, and high-speed control is possible.

In step # 10, the control waits for the rotation control to settle. The operation in this case is the same as that in step # 5. By the above operation, the optical head 14 is moved at high speed from the track number CUR located to the target track number TGT. Here, a signal waveform in the apparatus shown in FIG. 5 in the case of accessing a land track will be described.

FIG. 7 shows the optical disk apparatus of FIG.
5 is a time chart conceptually showing an example of each signal waveform and a detection signal when accessing a land track. The symbols attached to the respective signal waveforms in the figure are: TE is a tracking error signal, ACT DRV is an objective lens drive signal output from the first selector 19, SLED DRV is a feed motor drive signal output from the controller 31,
SPN DRV is a rotation motor drive signal output from the rotary servo circuit 25, IDpu is a detection pulse of the ID section output from the ID detection circuit 24, t indicates time, and CU
R indicates the current track number of the optical head 14, TGT indicates a target track, and # 3 to # 7 indicate steps # 3 to # 7 in FIG.

In FIG. 7, the light beam is located first on the land, and the track numbers are assigned from the outer circumference to the inner circumference. In addition, the tracking error signal of TE is output for one cycle in one set of land and groove. Then, from time # 4, pulling in of the rotation control by the meandering signal is started. Although the meandering signal itself is not shown, the bandpass filter 20 of the signal TE is used.
Obtained by output. Generally, the cycle of the meandering signal is I
Since the period of the detection pulse IDpul of the D section is considerably shorter, it can be settled in about # 4 period. If
If it is assumed that the rotation control is pulled in with the detection pulse IDpu of the ID section, as can be seen from the number of IDpuls in FIG.
It will take longer.

As described above, in the fifth embodiment (the optical disk device of claim 7), the access for moving the light beam from the current recording track to another recording track in the optical disk device of FIG. Means is provided, and when there is no groove (guide groove) in another recording track during movement, the optical disk recording medium is controlled so that the meandering frequency of the groove obtained from the recording track having the groove in the vicinity thereof is constant. The number of rotations is controlled. In the apparatus shown in FIG. 5, the access means includes the controller 31, the feed motor 15, the tracking error signal detection circuit 16, and the second comparator 22. The control of the number of rotations of the optical disk recording medium is performed by the high frequency signal detection circuit 23, the ID detection circuit 24, the second frequency oscillator 30, the frequency comparator 26, the rotation servo circuit 2
5, executed by the rotation motor 12, the polarity switching circuit 17, the tracking servo circuit 18, and the controller 31. The flow is shown in FIG. Therefore, even when accessing the land track, the ZCLV rotation control can be performed at a high speed based on the meandering frequency of the groove, thereby shortening the access time and simplifying the rotation control on the land track. Is achieved.

Sixth Embodiment The sixth embodiment corresponds to the invention of claim 8, but also relates to the invention of the optical disk recording medium of claims 1 to 4. The sixth embodiment is an optical disk device for recording / reproducing information by using the optical disk recording medium described in the first to third embodiments. This optical disk recording medium is CAV. It is characterized in that data is recorded by generating a modulation clock for recording data by rotating the groove and multiplying the meander frequency for reproducing the groove.

FIG. 8 is a functional block diagram showing another example of the embodiment of the main part of the optical disk apparatus of the present invention. The reference numerals in the figure are the same as those in FIG.
41 is a rotary motor, 42 is a band pass filter, 43 is a frequency multiplier, 44 is a buffer memory, 45 is a modulator,
Reference numeral 6 denotes a laser driving circuit, Wck denotes a recording clock signal, and Wdata denotes a recording pulse train.

The optical disk apparatus of FIG. 8 rotates the optical disk recording medium of claims 1 to 4 described in FIGS. 1 and 2 at a constant angular velocity (CAV) to multiply the reproduction meander frequency of the groove. Then, a modulation clock of the recording data is generated to record the data. Therefore, the optical disk recording medium 11 has a groove meander for each zone in which ZCLV is possible. Here, the points different from the optical disk device of FIG. 5 will be briefly described. The configuration and operation of the optical disk device shown in FIG. 8 are as follows.

The rotary motor 41 is basically the same as the rotary motor 12 shown in FIG. 5, but in this embodiment,
Since it is driven at a constant angular velocity (CAV), that is, at a constant rotation speed, a particularly complicated control circuit is not required. The band-pass filter 42 is basically the same as the band-pass filter 20 of FIG. 5, but has a constant angular velocity (CAV).
The meandering frequency changes for each zone. Therefore, it is preferable to use the band-pass filter 42 having a configuration in which the center of the pass frequency can be switched for each zone. In the device shown in FIG. 8, only the first comparator 21 is provided as a comparator, and a meandering signal wbl is obtained from the comparison output. The frequency multiplier 43 outputs the meandering signal wb
A clock having a frequency that is a constant multiple of 1, that is, a recording clock signal Wck is generated. This frequency multiplier 43
Is realized by using a known PLL synthesizer.

The buffer memory 44 is a memory means for temporarily storing data to be recorded. Modulator 45
Extracts the recording data from the buffer memory 44 in synchronization with the recording clock signal Wck and converts it into a serial recording pulse train Wdata. The laser drive circuit 46 emits a recording light beam by modulating the intensity of the laser light source of the optical head 14 according to the recording pulse train Wdata. next,
The state of the change of the recording clock signal Wck for each zone will be described.

FIG. 9 is a diagram showing an example of a change state of the recording clock signal Wck output from the optical disk device of FIG. 8 for each zone. The horizontal axis in the figure is the disc radius (R),
The vertical axis indicates the frequency (fck) of the recording clock signal Wck.

As shown in FIG. 9, the recording clock signal Wck having a frequency proportional to the reproduction frequency of the groove meandering in the CAV rotation is generated from the optical disk device shown in FIG. Therefore, zone CAV recording becomes possible. As described above, in the optical disk apparatus of FIG. 8, since the clock signal for data recording is generated from the optical disk recording medium 11 itself, the recording clock signal corresponding to the recording density and the rotation of the optical disk recording medium 11 is automatically generated. Wck can be generated. Therefore, unlike the conventional zone CAV recording apparatus, a circuit for switching and generating the frequency of the recording clock signal Wck for each zone and a control device for a precise rotation speed are not required, and a low-cost and accurate zone CAV recording apparatus is required. Is achieved.

Further, since rotational speed control such as ZCLV recording is not required, the motor cost can be reduced, and the shift time is not required, so that the access time can be shortened. The physical properties of the recording layer are CA
Select one that has the property of allowing V recording. As described above, in the sixth embodiment (the optical disk device of claim 8), in order to record / reproduce information using the optical disk recording medium of claim 1, the optical disk recording medium is kept at a constant angular velocity. Rotation control means for rotating the recording medium and recording means for recording recording data on a recording track at a recording frequency corresponding to the meandering frequency obtained from the guide groove are provided. Then, in the apparatus shown in FIG.
It is. In the apparatus shown in FIG. 8, the recording means includes the tracking error signal detection circuit 16, the band-pass filter 42,
A comparator 21, a frequency multiplier 43, a buffer memory 44,
It is composed of a modulator 45 and a laser drive circuit 46.

[0071]

According to the optical disk recording medium of the present invention, in an optical disk recording medium having a spiral or concentric recording track, the recording track has a groove (guide groove) at least in part, and the recording medium has an information recording area. Is divided into a plurality of zones in the radial direction, and when the recording medium is rotated at a constant angular velocity, in each of the plurality of zones, the groove meanders in the radial direction at a predetermined frequency corresponding to each zone. The meandering spatial frequency is substantially constant for each zone. Therefore, the rotation control based on the meandering frequency can be performed, and a precise and high-speed zone CLV can be performed without expensive components such as an encoder.
By performing the land control after the rotation control in the groove, the zone CLV rotation control is executed substantially on the land.

In the optical disk recording medium according to the second aspect, the turn having the groove and the turn having no groove are alternated every one turn of the spiral. Therefore, in addition to the effect of the optical disk recording medium of claim 1, the track becomes one spiral over the entire circumference, and the same address management method as that of the ROM disk composed of one spiral can be used. In addition, the device cost is reduced, and compatibility with the ROM disk is increased.

In the optical disk recording medium according to the third aspect, the recording track has an address information area composed of a series of intermittent pits, and the address information areas are circumferentially arranged at predetermined angular intervals in each zone. Each zone is arranged at a substantially constant spatial distance . Therefore, in addition to the effects of the optical disk recording medium of claim 1 and claim 2, the address management method becomes easy,
Rotation control on the land can be performed based on the address information area, and more precise rotation control can be performed.

In the optical disk recording medium according to the fourth aspect, the groove is configured to meander in the radial direction by modulating the address information to a predetermined meandering frequency. Therefore, in addition to the effects of the optical disk recording medium of the first and second aspects, address information by pre-pits becomes unnecessary, and the corresponding amount can be allocated to the data recording area, so that the recording capacity increases and the recording capacity increases. Later, since the prepits and the recording marks are not mixed, and are composed of recording marks without any interruption, it is possible to obtain a reproduction signal substantially equivalent to a ROM disk.
Compatibility with ROM disks also increases.

In the optical disk device according to the fifth aspect, the first aspect
In order to record / reproduce information using the optical disk recording medium, means for controlling the number of rotations of the optical disk recording medium is provided so that the meandering frequency obtained from the groove is constant. Therefore, the rotation control based on the meandering frequency can be performed with a simple configuration, and a precise and high-speed zone CLV can be performed without expensive components such as an encoder. By performing the shift, the zone CLV rotation control is executed substantially on the land.

According to the optical disk device of the sixth aspect, the third aspect
When information is recorded / reproduced using an optical disk recording medium, when the meandering frequency of the groove cannot be obtained,
A rotation control means for obtaining a rotation control signal from the address information area and controlling the rotation speed of the optical disk recording medium is provided. Therefore, in addition to the effect of the optical disk device according to the fifth aspect, the address management can be facilitated with a simple configuration, and the rotation control on the land can be performed based on the address information area. Rotation control can be performed.

According to a seventh aspect of the present invention, in the optical disk device of the fifth aspect, access means for moving the light beam from the current recording track to another recording track is provided. When there is no groove (guide groove), the rotation speed of the optical disk recording medium is controlled so that the meandering frequency of the groove obtained from the recording track having the groove in the vicinity thereof becomes a constant frequency. Therefore, even when accessing the land track, the ZCLV rotation control can be performed at a high speed based on the meandering frequency of the groove, thereby shortening the access time and simplifying the rotation control on the land track. Is achieved.

In the optical disk device according to the eighth aspect, the first aspect
In order to record / reproduce information using an optical disk recording medium, a rotation control means for rotating the optical disk recording medium at a constant angular velocity, and record data at a recording frequency corresponding to a meandering frequency obtained from a guide groove. Recording means for recording on a track. This eliminates the need for expensive components such as an encoder, and generates a clock signal for data recording from the optical disk recording medium itself, thereby automatically generating a recording pulse according to the recording density and rotation of the optical disk recording medium. I do. Therefore, the normal zone CAV
Unlike a recording device, a circuit for switching and generating a recording clock frequency for each zone and a control device for a precise rotation speed are not required, and a low-cost and accurate zone CAV recording device is realized. Further, since rotational speed control such as ZCLV recording is not required, motor cost can be reduced, and since no shift time is required, access time can be shortened.

[Brief description of the drawings]

FIG. 1 is a diagram conceptually showing an example of an embodiment of a zone division and a recording track structure of an optical disc recording medium of the present invention.

FIG. 2 is a diagram showing an example of a relationship between a frequency and a rotation speed for each zone of the optical disc recording medium 1 shown in FIG.

FIG. 3 is an enlarged view of a main part conceptually showing an example of an embodiment of a spiral structure of a recording track of the optical disc recording medium of the present invention.

FIG. 4 is a time chart conceptually showing an example of a waveform of a meandering signal due to a groove and a detection signal of the optical signal recording medium of the present invention.

FIG. 5 is a functional block diagram showing an example of an embodiment of a main part configuration of the optical disk device of the present invention.

FIG. 6 is a flowchart showing a main processing flow of an operation of accessing a light beam from one track to another track in the optical disc apparatus of the present invention.

FIG. 7 is a time chart conceptually showing an example of each signal waveform and a detection signal when accessing a land track in the optical disk device of FIG. 5;

FIG. 8 is a functional block diagram showing another example of the embodiment of the main part configuration of the optical disk device of the present invention.

9 is a diagram showing an example of a state of a change in a recording clock signal Wck output from the optical disk device of FIG. 8 for each zone.

[Explanation of symbols]

 Reference Signs List 11 optical disk recording medium 12 rotation motor 13 objective lens 14 optical head 15 feed motor 16 tracking error signal detection circuit 17 polarity switching circuit 18 tracking servo circuit 19 first selector 20 band-pass filter 21 first comparator 22 second comparison Device 23 High-frequency signal detection circuit 24 ID detection circuit 25 Rotary servo circuit 26 Frequency comparator 27 Second selector 28 Third selector 29 First frequency oscillator 30 Second frequency oscillator 31 Controller 41 Rotary motor 42 Band-pass filter 43 Frequency multiplier 44 Buffer memory 45 Modulator 46 Laser drive circuit

Claims (8)

(57) [Claims] 1. An optical disk recording medium having a spiral or concentric recording track on which information is newly recorded or information has already been recorded, wherein the recording track has a guide groove at least in part, The recording medium has an information recording area divided into a plurality of zones in a radial direction, and the guide groove has a zone in each of the plurality of zones when the recording medium is rotated at a constant angular velocity. An optical disk recording medium, which meanders in a radial direction at a predetermined frequency according to the following, and a spatial frequency of the meandering is substantially constant in each of the zones. 2. The optical disc recording medium according to claim 1, wherein the recording track is formed such that a turn having a guide groove and a turn having no guide groove are alternately formed for each turn of the spiral. Optical disk recording medium. 3. The optical disk recording medium according to claim 1, wherein the recording track has an address information area composed of a series of intermittent pits, and the address information area extends in a circumferential direction in each of the zones. An optical disc recording medium characterized by being arranged at a predetermined angular interval and arranged at a substantially constant spatial distance in each zone. 4. The optical disk recording medium according to claim 1, wherein the guide groove is meandered in a radial direction by frequency-modulating address information to the predetermined meandering frequency. recoding media. 5. Recording information by newly recording information or using an optical disk recording medium having a spiral or concentric recording track on which information has already been recorded, and condensing a light beam on the recording track. In the optical disc apparatus for performing / reproducing, regarding the optical disc recording medium, the recording track has a guide groove at least partially, and the recording medium has an information recording area divided into a plurality of zones in a radial direction. The guide groove, when rotating the recording medium at a constant angular velocity, meanders in a radial direction at a predetermined frequency according to each zone in each of the plurality of zones, the space of the meandering The frequency is an optical disk recording medium that is substantially constant for each of the zones, and the meandering frequency obtained from the guide groove is a constant frequency. An optical disk device, further comprising a rotation control unit for controlling the number of rotations of the optical disk recording medium. 6. The optical disk device according to claim 5, wherein, in the optical disk recording medium, the recording track has an address information area composed of a series of intermittent pits, and the address information area has a circumference in each of the zones. An optical disc recording medium arranged at predetermined angular intervals in the direction, and arranged at a substantially constant spatial distance in each zone, and when the meandering frequency of the guide groove cannot be obtained, An optical disk device comprising: a rotation control unit that obtains a rotation control signal from an address information area and controls the number of rotations of the optical disk recording medium. 7. The optical disk device according to claim 5, further comprising an access unit for moving a light beam from a current recording track to another recording track, wherein said rotation control unit performs said another recording track when said moving. An optical disk device, wherein, when there is no guide groove, the number of rotations of the optical disk recording medium is controlled so that the meandering frequency of the guide groove obtained from a recording track having the guide groove in the vicinity thereof is constant. . 8. Recording information by newly recording information or using an optical disk recording medium having a spiral or concentric recording track on which information has already been recorded, and condensing a light beam on the recording track. In the optical disc apparatus for performing / reproducing, regarding the optical disc recording medium, the recording track has a guide groove at least partially, and the recording medium has an information recording area divided into a plurality of zones in a radial direction. The guide groove, when rotating the recording medium at a constant angular velocity, meanders in a radial direction at a predetermined frequency according to each zone in each of the plurality of zones, the space of the meandering A rotation control for rotating the optical disk recording medium at a constant angular velocity, wherein the frequency is an optical disk recording medium that is substantially constant for each of the zones; An optical disc device, comprising: recording means for recording recording data on the recording track at a recording frequency corresponding to a meandering frequency obtained from the guide groove.