JPH0887777A - Optical disk medium and optical disk device - Google Patents

Abstract

PURPOSE: To prevent a recording and a reproducing from being interrupted by arranging groove tracks and land tracks continuously on one line of a spiral and connecting groove tracks and land tracks while changing over them every one round amount of an optical disk. CONSTITUTION: Since recording tracks forms a helical spiral, the Nth sector of a groove track is connected to the 1st sector of the track of a track number (T-1) assigned to land tracks. Moreover, the Nth sector of the land track of the track number (T-1) is connected to the 1st sector of a track number T assigned to groove tracks. In the case of performing a recording and a reroducing with respect to an optical disk, when a light beam is once made to be tracking on one track. since thereafter the optical spot scans alternately and successively groove tracks and land tracks, it can access all of information without allowing it to perform track jumping operations.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk medium and an optical disk device. Among them, in particular, the recording capacity is increased by recording information on both the track having the guide groove on the optical disk and the land track provided on the flat portion between the guide groove and the guide groove. The present invention relates to an optical disc medium and an optical disc device that records and reproduces information on the optical disc medium.

[0002]

2. Description of the Related Art In optical disc media currently on the market, a guide groove for a laser beam spot for recording and reproducing is provided and the light spot is tracked on the guide groove, that is, a groove, or a flat portion between the guide grooves. That is, the desired track is accessed by any method of tracking the land to record / reproduce information. The method of tracking on the guide groove is called groove recording, and the method of tracking a flat portion between the guide grooves is called land recording, and the groove or land is a track for recording / reproducing information. Therefore, currently available optical disk media contain information only in one of the groove and the land, and the other serves as a buffer band for separating the signals of adjacent tracks.

FIG. 3 is a partially enlarged view of such a conventional optical disk medium. In FIG. 3, reference numeral 1 denotes a recording layer, which is formed of, for example, a phase change material or a magneto-optical material. 2 is a recording pit, 3 is a focused spot of laser light, 4
Is a groove, 5 is a land, and is a groove 4 and a land 5.
The width of is generally designed to be wider on the information track side. Reference numeral 6 is an address pit for expressing position information on the disc. The transparent disk substrate through which the laser light is transmitted exists below the recording film 1, but is omitted in the figure.

An optical disk device for recording and reproducing information using this optical disk medium is disclosed in, for example, Japanese Patent Laid-Open No. 8-6.
The operation will be described in the conventional example shown in Japanese Patent No. 4182. In this conventional example, the groove is called a concave portion and the land is called a convex portion, but the meanings are the same.

FIG. 4 is a block diagram of a conventional optical disk device. As shown in the figure, 7 is an optical disk and 8 is a recording track, which is a land in this example. Reference numeral 10 is a semiconductor laser, 11 is a collimating lens for converting the emitted light of the semiconductor laser 10 into parallel light, 12 is a beam splitter placed in a collimated beam, and 13 is a beam splitter 1.
2 is an objective lens that focuses parallel light that has passed through 2 on the recording surface of the optical disc 7, and 14 is a photodetector that receives reflected light from the optical disc 7 that has passed through the objective lens 13 and the beam splitter 12, and has a tracking error. It is composed of two light receiving portions 14a and 14b which are divided into two in parallel with the track direction of the disc in order to obtain a signal. 15 is the objective lens 1
The actuators 3 to 3 support the optical heads 10 to 15 mounted on a head base (not shown).

Reference numeral 17 is a differential amplifier to which the detection signals output from the light receiving sections 14a and 14b are input, 18 is a low pass filter (LPF) to which the difference signal output from the differential amplifier 17 is input, and 19 is an output signal from the LPF 18. And a control signal L1 from a system controller 32 described later, and outputs a tracking control signal to a drive circuit 20 described later, 20 is a drive circuit which outputs a drive current to the actuator 15, and 21 is a light receiving unit. 14
a and 14b are addition amplifiers that receive the detection signals and output sum signals; 22 is a high-pass filter (HPF) that outputs the high-frequency component of the sum signals input from the addition amplifier 21 to a reproduction signal processing circuit 23 described later. ), 23 is a reproduction signal processing circuit for outputting an information signal such as voice reproduced from the high frequency component of the sum signal input from the HPF 22 to the output terminal 24, and 25 is reproduced from the high frequency component of the sum signal input from the HPF 21. An address reproducing circuit that outputs an address signal to a system controller 32 described later.

Reference numeral 26 is a system controller 32 described later.
A traverse motor, which will be described later, by a control signal L2 from the radial access control circuit that outputs a drive current to a radial access motor 27, 27 is a radial access motor that moves the optical head 16 in the radial direction of the optical disk 7, and 28 is the optical disk 7. Is a spindle motor for rotating the motor, 29 is a recording signal processing circuit for outputting a recording signal generated from an information signal such as a voice input from an external input terminal 30 to an LD drive circuit 31 described later, 31 is a system controller 32 described later From the address reproduction circuit 25, the control signal L3 from the control signal L3 and the recording signal from the recording signal processing circuit 30 are input to the semiconductor laser 10, and the driving signal is input from the address reproduction circuit 25 to the tracking control circuit 19. Access control circuit 2
6, and a system controller that outputs a control signal to the LD drive circuit 31.

The operation of the conventional optical disk device configured as described above will be described with reference to FIG. Semiconductor laser 1
The laser light emitted from 0 is collimated by the collimator lens 11, collimated by the collimator lens 11, and focused on the optical disc 7 by the objective lens 13 through the beam splitter 12. The light beam reflected by the optical disc 7 has information on the recording track 8 by diffraction, and is guided to the photodetector 14 by the beam splitter 12 via the objective lens 13. The detectors 14 a and 14 b convert the light amount distribution change of the incident light beam into an electric signal and output the electric signal to the differential amplifier 17 and the addition amplifier 21, respectively. The differential amplifier 17 performs IV conversion of the respective input currents and then takes the difference to obtain the LP
It is output to F18 as a push-pull signal.

The LPF 18 extracts a low frequency component from the push-pull signal and outputs it as a tracking error signal to the tracking control circuit 19. The tracking control circuit 19 outputs a tracking control signal to the drive circuit 20 according to the level of the input tracking error signal, and the drive circuit 20 supplies a drive current to the actuator 15 according to this control signal, and the objective lens 13 Position control in the direction across the recording track. As a result, the focused spot scans the land portion 5 correctly. In addition, the objective lens 13 is positionally controlled in the direction perpendicular to the disc surface by a focus control circuit (not shown) so that the focused spot is correctly focused on the disc, but the description is omitted because it is not directly related to the present invention. To do.

On the other hand, the adding amplifier 21 performs IV conversion of the output currents of the light receiving portions 14a and 14b, adds the output currents, and outputs the result as a sum signal to the HPF 22. The HPF 22 cuts off unnecessary low-frequency components from the sum signal and passes the reproduction signal and the address signal, which are main information signals, and the reproduction signal processing circuit 23.
Output to. The reproduction signal processing circuit 23 demodulates the input reproduction signal, performs processing such as error correction thereafter, and outputs it as an audio signal or the like to the output terminal 24. The address reproduction circuit 25 demodulates the input reproduction signal and outputs it to the system controller 32 as position information on the disc.
That is, as a result of the converging spot 3 scanning the recording pit 2, a reproduction signal is input to the reproduction signal processing circuit 23, and scanning the address pit 6 results in the address reproducing circuit 25.
An address signal is input to. System controller 3
2 determines whether or not the light beam is currently at the desired address based on this address signal.

The radial access control circuit 26 controls the control signal L from the system controller 32 when the optical head is moved.
In accordance with 2, the drive current is output to the radial access motor 27 to move the optical head 16 to the target track.
At this time, the tracking control circuit 19 similarly suspends the tracking servo by the control signal L1 from the system controller 32. Further, during normal reproduction, the radial access motor 27 is driven according to the low frequency component of the tracking error signal input from the tracking control circuit 19, and the optical head 16 is gradually moved in the radial direction as the reproduction progresses.

At the time of recording, the recording signal processing circuit 29 adds an error correction code or the like to the audio signal input from the external input terminal 30 and outputs it as an encoded recording signal to the LD drive circuit 31. When the system controller 32 sets the LD drive circuit 31 to the recording mode by the control signal L3, the LD drive circuit 31 modulates the drive current applied to the semiconductor laser 10 according to the recording signal. As a result, the intensity of the light spot irradiated on the optical disk 7 changes according to the recording signal, and the recording pit 2 is formed.

On the other hand, at the time of reproduction, the LD drive circuit 31 is set to the reproduction mode by the control signal L3, and the drive current is controlled so that the semiconductor laser 10 is emitted at a constant intensity. This makes it possible to detect recording pits and address pits on the recording track.

During each of the above operations, the spindle motor 28 rotates the optical disk 7 at a constant linear velocity or angular velocity.

In order to increase the recording capacity of the conventional optical disk medium and optical disk device configured as described above, conventionally, the width of the groove or land is narrowed to close the track interval. Was there.

In addition to the above, recently, in order to increase the recording capacity of the optical disc, a so-called land-groove recording system has been proposed in which information is recorded in both the groove and the land. This method is disclosed, for example, in Japanese Patent Publication No. 63-57.
As disclosed in Japanese Patent No. 859, the groove width / land width is set to such a width that the mixing of signals from adjacent tracks is not a problem compared with the light spot diameter, and the groove formed by the groove is used. Both the track and the land track formed by the land are used as tracks for recording and reproducing information.

FIG. 5 is a partially enlarged view of the optical disk medium in this prior art example. In the figure, reference numeral 1 is a recording layer, which is made of, for example, a phase change material or a magneto-optical material.
2 is a recording pit, 3 is a focused spot of laser light,
The same reference numerals as those described in FIG. 3 are attached to the above. Reference numeral 4 is a groove portion, and 5 is a land portion. As shown in FIG. 5, the width of the groove portion 4 and the width of the land portion 5 are substantially equal.

In this optical disk medium, the recording pit 2 has a groove portion 4 and a land portion 5 as shown in FIG.
Will be formed in both. Adjacent groove part 4
The recording capacity can be doubled by making the intervals of 1 or the intervals of the lands 5 the same as those of the conventional optical disk medium shown in FIG.

Recording / reproducing of information on / from the optical disk medium is basically performed in the same manner as in the conventional optical disk device shown in FIG. The light spot keeps scanning the groove track if the groove portion 4 is tracked, and keeps scanning the land track if the land portion 5 is tracked. Here, as described in Japanese Patent Publication No. 63-57859, the tracking error for performing tracking control is different between when the light spot is scanning the groove track and when it is scanning the land track. It is necessary to reverse the polarity of the signal. this is,
In FIG. 4, the LPF 18 and the tracking control circuit 19
It is realized by additionally inserting an ON / OFF controllable inverting amplifier between the two.

Another prior art example of the land / groove recording system is as follows:
For example, there is JP-A-6-84172. FIG. 6 shows a block diagram of the optical disk device of the preceding example, and FIGS. 7 and 8 show two examples of the optical disk medium driven by the optical disk device. The configuration and operation will be described below based on the description given in Japanese Patent Laid-Open No. 6-84172.

In FIG. 6, reference numeral 9 is an optical disk having both land and groove as recording tracks, and 8 is a recording track. Here, the track of the optical disc 9 is divided into a plurality of sectors, and an address pit is formed at the head of each sector to indicate the address of the sector. Since the constituent elements 10 to 31 are basically the same as the constituent elements of the optical disk device shown in FIG. 4, the same parts are designated by the same reference numerals and detailed description thereof will be omitted.

The parts different from FIG. 4 are as follows. Reference numeral 50 denotes a polarity inversion circuit that inverts the polarity of the tracking error signal input from the LPF 18 based on the control signal L4 input from the system controller 52 and outputs the polarity to the tracking control circuit 19, and 51 indicates the polarity input from the tracking control circuit 19. Tracking error signal,
Control signal L5 input from the system controller 52
Based on the above, the jump control circuit for outputting the control signal L6 to the drive circuit 20, 52 receives the address signal from the address reproduction circuit 25, and the tracking control circuit 19, the radial access control circuit 26, the LD drive circuit 31, the polarity inversion circuit The system controller outputs control signals L1 to L5 to the jump control circuit 51 and the jump control circuit 51, respectively.

The operation of the optical disk device of this prior art example is as follows. When the address for starting recording / reproducing is designated, the system controller 52 determines whether the designated address is a sector in the land portion or a sector in the groove portion by referring to an address map or the like, and the address in the land portion is determined. At the same time, it outputs an inversion ON signal to the polarity inversion circuit 50, and an inversion OFF signal at the time of the address in the groove portion as a control signal L4, and also outputs a control signal L2 to the radial access control circuit 26 to drive the radial access motor 27. It is driven to move the optical head 16 to the vicinity of the track having the target address. This operation is called macro seek. This movement is performed, for example, by calculating the number of tracks between the addresses before the movement and the target address in advance, and comparing the number with the number of tracks crossing obtained from the tracking error signal during the movement. Prior to the macro seek, the objective lens 13 is positionally controlled in the optical axis direction by a focus control circuit (not shown) so that the recording surface of the optical disc 9 is positioned at the focus of the objective lens 13, as in the conventional optical disc device. is there.

Then, the tracking control circuit 19 is turned on by the control signal L1 to scan the land portion or the groove portion with the light spot. When the tracking pull-in is completed, the address reproducing circuit 25 reads the address of the sector currently being scanned from the address pit, as described in the description of the conventional example of FIG.
Enter the current address in 2. System controller 5
2 compares the current address with the target address, and when the difference is 1 track or more, specifies the number of tracks to be jumped to by the jump control circuit 51 through the control signal L5, and the jump control circuit 51 is specified through the drive circuit 20. The actuator 15 is moved by a small amount so as to make a track jump by the number of tracks. This operation is called micro seek. When the micro-seek is completed and the light spot starts scanning the sector of the target address, information reproduction from this sector and thereafter is performed as in the conventional example. As described above, since the polarity reversing circuit 50 is designated in advance before the seek operation so as to have the polarity suitable for tracking to the recording track where the target address exists, the land portion and the groove portion can be pulled in without making a mistake. You can

Next, the recording / reproducing operation at this time will be described by taking the case of using the optical disc medium shown in FIG. 7 as an example. FIG. 7 is a diagram conceptually showing the sector arrangement of the optical disc 9. A track address is assigned to each recording track for each turn through a land portion and a groove. The light spot scans clockwise from the inner circumference side to the outer circumference side as the optical disk rotates. In the figure, the recording track addresses are T, T + 1, T + 2, T + 3,
It is indicated by T + 4. Each track is divided into N sectors, and sector addresses 1 to N are assigned to each sector. Since the recording track has a spiral shape, the Nth sector of the Tth track and the 1st sector of the T + 2th track are connected in the groove. In the land, the Nth sector of the T + 1 track and the 1st sector of the T + 3 track are connected. These track address and sector address are formed in advance on the disk as the above-mentioned address pits together with the PLL pits for reproduction synchronization.

Assuming that the above-mentioned target address is the 1st sector of the Tth track (here, it is a groove), as a result of the micro seek, the light spot moves to this track. Recording and reproduction are performed from the sector No. While recording / reproducing a track on this groove, the control signal L4 is inverted OF.
Since it is the F signal, the polarity reversing circuit 50 outputs the tracking error signal from the LPF 18 to the tracking control circuit 19 as it is.

When the recording / reproduction up to the Nth sector of the Tth track is completed, the system controller 52 detects this by the address signal from the address reproduction circuit 25, and the jump control circuit 51 outputs 1 to the inner circumference side. To perform a track jump, that is, to jump from the groove track to the adjacent land track on the inner circumference side,
The command is given through the control signal L5. At the same time, control signal L1
To temporarily stop the tracking servo operation.
Further, an inversion ON signal is input to the polarity inversion circuit 50 to invert the tracking error signal. Jump control circuit 51
Drives a drive current through the drive circuit 20 so that the actuator 15 moves to the inner peripheral side by a distance between the groove and the land, that is, a distance half the groove pitch.

Such a one-track jump is essentially the same as the one-track jump between the grooves or between the lands in the conventional optical disk apparatus of the groove recording method or the land recording method, and the acceleration / deceleration current at a constant time interval. This is done by applying a pulse. When the movement of the light spot to the adjacent recording track, that is, the land track of track number T + 1 is completed, the system controller 52 causes the control signal L
The tracking control circuit 19 is turned on through 1 to perform tracking pull-in. When retraction is complete,
Recording / reproduction is performed again from the first sector. While scanning the T + 1th track, the polarity reversing circuit 50
The tracking error signal input from F18 is inverted and continuously output to the tracking control circuit 19. In this way, when the scanning is completed up to the Nth sector of the T + 1th track, one track jump is made again to the inner circumference side, and T + 2
The same operation is performed by moving to the track on the numbered groove.

Here, when the time required for one track jump is not negligible as compared with the one sector length,
It has been proposed to provide a gap required for one track jump at the boundary between the 1st sector and the Nth sector. This gap is shown as a jump point in FIG. Alternatively, there is a method in which the last sector of each track is used as a track jump gap and this sector is discarded.

As described above, the jump control circuit 51 instructs the drive circuit 20 and the actuator 15 to make a one-track jump every time the recording track makes one round, and at this time, the polarity reversing circuit 50 causes the land portion and the groove portion to be moved. By alternately inverting the polarity of the tracking error signal with and,
Information is recorded and reproduced on both tracks.

As yet another prior art example, a case where the optical disk device shown in FIG. 6 is used and the optical disk medium shown in FIG. 8 is used will be described. FIG. 8 is a diagram conceptually showing the sector arrangement of the optical disc 9. In the optical disc of FIG. 7, the first sector of the recording track is arranged on the same radius, and the point where the track jump is performed is always the boundary between the Nth sector and the first sector, but in the optical disc of FIG. The point where the track jump is performed is shifted by a certain number of sectors for each recording track.

In this prior art example, the time required for one track jump is not negligible, and the light spot is one.
It is assumed that the time is shorter than the time for scanning a sector.
As shown in FIG. 8, the light spots are shifted one sector at a time in the direction opposite to the scanning direction of the light spot toward the outer peripheral side. That is, the length of one track is made shorter by one sector than one round of the optical disk. As a result, even if the optical spot scans the Nth sector of the Tth track and then jumps one track, the track jump is completed before the optical spot reaches the first sector of the T + 1th track. ing. Since there is no need to provide a gap section, there is no reduction in recording capacity.

As described above, the conventionally known land-groove recording type optical disk has a structure in which the land track and the groove track separately form spiral information tracks, and all of the optical disks on the optical disk are formed. At some point a track-jump between land and groove was required to access the track. By devising the timing of this track jump, measures have been taken to shorten the access time, secure the temporal continuity of recording and reproduction, or avoid the reduction of the recording capacity.

[0034]

The above-described conventional land-groove recording system technologies have the following problems, respectively. In the first conventional example of the land-groove recording system shown in FIG. 5, information signals cannot be continuously recorded / reproduced on all tracks. That is, when the light spot has finished scanning from the leading end (usually on the inner circumference side of the optical disc) to the last end (usually on the outer circumference side of the optical disc) of the groove track, the radial access motor causes the optical head to scan the optical disc again. It is necessary to move to the inner circumference to access the leading edge of the land track. Therefore, during this period, there is a problem that recording and reproduction are interrupted for a long time.

Further, in the second and third prior art examples of the land / groove recording system shown in FIGS. 7 and 8, each time the disk makes one revolution, from the groove track to the land track, or from the land track to the groove track. The optical spot must be track-jumped to, the drive control becomes complicated, recording / reproduction is interrupted during this jump, and in the second prior example, there is a loss of recording capacity in the track-jumping section. There was a problem.

These problems are caused by two spirals, namely, a spiral formed by all groove tracks and a spiral formed by all land tracks on the optical disc when both grooves and lands are used as information tracks. There was a basic cause for doing this. To access all the tracks, somewhere a track jump action between the two spirals is required.

The present invention has been made to solve the above problems, and provides an optical disk medium capable of continuously recording and reproducing information signals on both groove tracks and land tracks without interruption, and an optical disk medium therefor. The purpose is to obtain an optical disk device for recording and reproducing.

[0038]

In the optical disk medium according to the present invention, both the groove and the land formed by the guide groove are used as tracks, and all tracks on the optical disk are formed by only one spiral. I am configuring. That is, the groove track for one rotation of the disk continues to the land track for one rotation of the next disk, and the land track for one rotation of the subsequent disk continues to the groove track for one rotation of the next disk. In addition, the groove track and the land track are alternately connected every one rotation of the disk.

The optical disk device according to the present invention is
In order to drive the optical disk medium, at least an optical system that focuses a laser on the optical disk and detects a servo signal and an information signal from the reflected light thereof, and a beam displacement means that displaces a light beam in the disk radial direction, Tracking control means for controlling the light spot position so that the light spot scans over the track, and tracking polarity for inverting the polarity of the tracking control direction depending on whether the light spot is on the groove track or on the land track. The boundary between the groove track and the land track in order to generate a command for reversing the tracking polarity to the tracking polarity reversing means by judging the timing when the light spot is on the groove track and the timing when the light spot is on the land track. Land Groove Track Boundary Detecting Hand The recording polarity is periodically inverted at the boundary between the groove track and the land track for each rotation of the optical disc, and the information is recorded / reproduced by continuously tracking the groove track and the land track. It is a thing.

[0040]

In the optical disk medium according to the present invention, since the groove track and the land track are switched while the optical disk is rotated by one revolution, all information tracks are continuously arranged on only one spiral existing on the optical disk. Will be done.

The optical disk device according to the present invention is
The boundary between the groove track and the land track can be automatically detected, and tracking can be continued on the track being scanned while switching the tracking polarity, and all information tracks on the optical disk medium can be continuously tracked without track jumping. Can be accessed.

[0042]

EXAMPLE An optical disc medium according to this example,
An embodiment of an optical disk device that drives this medium will be described.

Example 1. 1 is a schematic diagram conceptually showing the arrangement of tracks and sectors on a disk medium according to a first embodiment of the present invention. In the figure, each recording track has 1
Track addresses are assigned to each circumference through the land portion and the groove portion. The light spot scans clockwise from the inner circumference side to the outer circumference side as the optical disk rotates. The recording track addresses are T-2, T-1, T,
It is shown by T + 1, T + 2, and T + 3. Each track is
One round is divided into N sectors, and sector addresses 1 to N are assigned to each sector. Since the recording tracks are spiral spirals, the Nth sector of the track number T-2 assigned to the groove track and the track number T-1 track assigned to the land track are recorded. The 1st sector is connected. Further, the Nth sector of the land track with the track number T-1 is connected to the 1st sector of the track number T assigned to the groove track. Similarly, one track, that is, a groove track and a land track are alternately connected for each rotation of the disk.

These track address and sector address are formed in advance on the optical disc as the above-mentioned address pits together with the PLL pits for reproduction synchronization. Further, the boundary where the groove track and the land track are switched is aligned on one radius of the optical disk as shown in FIG.

When recording / reproducing to / from this optical disk, the light beam is once tracked on one track, and thereafter, the groove track and the land track are alternately and alternately scanned, so that the track jump operation is performed. Without access, all information tracks on the optical disk will be accessed.

Since the principle of the land-groove recording method is not affected by the recording material, it can be applied to the optical disk of the phase change (PC) recording material and the optical disk of the magneto-optical (MO) recording material as it is. it can. Further, the present invention can be applied to a read-only ROM type optical disk as it is.

Example 2. 2 is a block diagram of an optical disk device according to a second embodiment of the present invention. The same reference numerals as those in FIG. 6 denote the same or corresponding portions, and 60 is shown in FIG. 1 in which both land grooves are recording tracks. The optical disc, 61 receives the address signal from the address reproducing circuit 25, and outputs the track boundary signal to the system controller 62. The land groove track boundary detecting circuit, the system controller 62 displays the address reproducing circuit 2.
5, an address signal is input from the land groove track boundary detection circuit 81, and a track boundary signal is input from the land groove track boundary detection circuit 81 to the tracking control circuit 19, the radial access control circuit 26, the LD drive circuit 31, the polarity reversing circuit 50, and the jump control circuit 51. Control signals L1 to L5, respectively
Is output.

Next, the operation of the part different from the conventional example will be described. When the address for starting recording / reproducing is designated, the system controller 62 causes the radial access control circuit 26 to
The control signal L2 to the radial access motor 27
Is performed to perform the macro seek for moving the optical head 16 to the vicinity of the track having the target address. In this movement, as in the conventional example, for example, the number of tracks between the two is calculated in advance from the difference between the address before movement and the target address, and compared with the number of tracks crossed from the tracking error signal during movement. Done by.
Prior to this macro seek, the optical disc 9 is focused on the objective lens 13 by a focus control circuit (not shown).
The objective lens 13 is positionally controlled in the optical axis direction so that the recording surface is positioned in the same manner as in the conventional optical disk device.

Then, the tracking control circuit 19 is turned on by the control signal L1 to scan the land portion or the groove portion with the light spot. When the tracking pull-in is completed, the address reproducing circuit 25 reads the address of the sector currently being scanned from the address pit, and inputs the current address to the system controller 62, as described in the description of the conventional example.

At the same time, the address signal is also input to the land / groove track boundary detection circuit 61, and it is determined whether or not the currently scanned sector is a track boundary at which the land track is switched to the groove track or from the groove track to the land track. To do. When it is a track boundary, the land / groove track boundary detection is transmitted to the system controller 62 through the track boundary signal,
Upon receiving this signal, the system controller 62 sends an inversion ON or OFF signal to the polarity inversion circuit 50 via the control signal L4 in synchronization with the timing when the light spot passes through the boundary between the land track and the groove track. An inversion OFF signal is output when the boundary is the boundary from the land track to the groove track, and an inversion ON signal is output when the boundary is the boundary from the groove track to the land track.

The system controller 62 compares the current address with the target address, and when the difference is 1 track or more, it specifies the number of tracks to be jumped to the jump control circuit 51 through the control signal L5. Micro-seek is performed to move the actuator 15 by a small amount so that the specified number of tracks are jumped through the drive circuit 20. When this micro-seek is completed and the optical spot starts scanning the sector of the target address, information reproduction from this sector and subsequent sectors is performed as in the conventional example. Even if a land / groove track boundary exists between them, the operations of the land / groove track boundary detection circuit 61 and the system controller 62 at the boundary portion are the same as those described above.

Next, the recording / reproducing operation at this time will be described by taking the case of using the optical disk medium shown in FIG. 1 as an example. Assuming that the target address is the 1st sector of the Tth track (which is a groove here), as a result of the micro seek, the light spot moves to this track, and the 1st sector is instructed by the system controller 52. Recording / reproduction is performed from the sector. While the track on this groove is being recorded / reproduced, the control signal L4 is an inversion OFF signal, so the polarity inversion circuit 50 outputs the tracking error signal from the LPF 18 to the tracking control circuit 19 as it is.

When the recording / reproducing up to the Nth sector of the Tth track is completed, the system controller 62 detects this by the address signal from the address reproducing circuit 25, and the land / groove track boundary detecting circuit 61.
The landing / tracking track boundary passage timing is detected by the track boundary signal input from the above, and an inversion ON signal is input to the polarity inversion circuit 50 to invert the tracking error signal. The light spot is the land track T
Reaching the 1st sector of the + 1st track, recording / reproduction is continued.

As described above, in the second embodiment, unlike the conventional example, the transition from the groove track to the land track is completed only by the polarity inversion operation of the tracking error signal, and the track jump is not necessary. When the scanning up to the Nth sector of the T + 1th track is completed in this way, the polarity of the tracking error signal is inverted again when the land groove track boundary is crossed, and the same operation is performed by moving to the track on the T + 2th groove. Done.

As described above, the polarity inversion circuit 50 alternately inverts the polarity of the tracking error signal in accordance with the track boundary detection signal at the land / groove track boundary that appears every time the information track makes one revolution, and the land portion and Information can be continuously recorded / reproduced on both tracks of the groove portion, and during this, the recording / reproduction operation is not interrupted instantaneously.

[0056]

As described above, in the optical disc medium according to the present invention, since the groove track and the land track are continuously arranged on one spiral, all the information tracks are continuously accessed. In addition, the track jump operation between the groove track and the land track becomes unnecessary, and all the information signals can be continuously arranged on the optical disc medium.

When the optical disc medium according to the present invention is driven by the optical disc device according to the present invention, all information tracks on the optical disc medium are continuously accessed without track jump between the groove track and the land track. Therefore, it is possible to record and reproduce all information signals on the optical disk medium continuously without any loss in recording capacity and without any momentary interruption.

[Brief description of drawings]

FIG. 1 is a diagram showing a sector arrangement of an optical disc medium according to a first embodiment of the present invention.

FIG. 2 is a block diagram of an optical disk device according to a second embodiment of the present invention.

FIG. 3 is a perspective view showing a structure of an optical disc medium used in a conventional optical disc device.

FIG. 4 is a block diagram showing a configuration of a conventional optical disc device.

FIG. 5 is a perspective view showing a structure of an optical disc medium used in a conventional optical disc device.

FIG. 6 is a block diagram showing a configuration of a conventional optical disc device.

FIG. 7 is a diagram showing a sector arrangement of another optical disc medium used in a conventional optical disc device.

FIG. 8 is a diagram showing a sector arrangement of still another optical disk medium used in a conventional optical disk device.

[Explanation of symbols]

4 groove part, 5 land part, 16 optical head, 17
Differential amplifier, 18 low-pass filter (LPF), 19
Tracking control circuit, 20 drive circuit, 21 addition amplifier, 22 high-pass filter (HPF), 23 reproduction signal processing circuit, 25 address reproduction circuit, 26 radial access control circuit, 27 radial access motor, 28 spindle motor, 29 recording signal processing circuit , 31 LD drive circuit, 50 polarity inversion circuit, 51 jump control circuit, 52 system controller, 60
Optical disc, 61 land / groove track boundary detection circuit, 62 system controller.

Claims (2)

[Claims] 1. A groove track for one revolution of a disk in an optical disk medium having a guide groove and recording information on both a groove track provided on the guide groove and a land track provided on a flat portion between the guide grooves. And the land tracks for one revolution of the disk are alternately and continuously connected,
An optical disk medium characterized in that information tracks on the disk are formed in a single spiral shape. 2. An optical disc device for driving the optical disc medium according to claim 1, wherein an optical system for irradiating the optical disc medium with a light beam generated from a light source, and the light beam according to a fine adjustment signal. Beam displacing means for displacing in the radial direction of the optical disk medium, tracking control means for driving and controlling the light beam displacing means so that the light beam scans the information track, and the light beam on the groove track. Polarity reversing means for reversing the polarity in the tracking control direction depending on whether it is on the land track or not, and on the polarity reversing means by detecting the boundary between the groove track and the land track of the optical disk medium. And an optical disk medium for detecting the above-mentioned optical disk medium. An optical disk device, which is configured to continuously record and reproduce information on both a groove track and a land track of the body.