JP3073745B2 - Optical disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus, and more particularly, to a method of forming a recording track of a concave portion formed by a guide groove on a disk and a recording track of a convex portion formed between the guide grooves. The present invention relates to an optical disk device that performs recording and reproduction on an optical disk medium that records signals on both.

[0002]

2. Description of the Related Art In recent years, as a recording method for a large-capacity rewritable optical disk medium, a groove portion (also referred to as a groove: G) and an inter-groove portion (also referred to as a land: L) have been developed to improve recording density. A so-called land / groove recording method for recording data on both is under study. With a disk having the same groove pitch, the track pitch can be halved, so that the effect of increasing the density is great. As described above, the groove portion and the inter-groove portion may be referred to as a concave portion and a convex portion, respectively, as described above.

First, a conventional land / groove recording type optical disk apparatus will be described. FIG.
FIG. 1 is a block diagram illustrating a configuration of a conventional optical disc device described in Japanese Patent No. 76404. In FIG. 9, 1
Reference numeral 00 denotes an optical disk, 101 denotes a semiconductor laser, 102 denotes a collimating lens for converting the laser light from the semiconductor laser 101 into parallel light, 103 denotes a half mirror, and 104 denotes a light for condensing the parallel light passing through the half mirror 103 onto the optical disk. An objective lens 105 is a photodetector that receives reflected light from the optical disc 100 that has passed through the objective lens 104 and the half mirror 103, and is divided into two parts in parallel with the track direction of the disc to obtain a tracking error signal. Department. Reference numeral 106 denotes an actuator that supports the objective lens 104, and the portion 107 surrounded by the dotted line is attached to the head base, and forms an optical head. 108, a differential amplifier to which a detection signal output from the photodetector 105 is input; 109, a differential amplifier 1
This is a polarity inverting unit that receives a tracking error signal from the control signal 08 from the system control unit described later and outputs a tracking error signal to the tracking control unit 110. Here, as for the polarity of the tracking control, when the tracking error signal is input from the differential amplifier 108 to the tracking control unit 110 with the same polarity, the tracking pull-in is performed on the recording track of the groove. Reference numeral 110 denotes a tracking control unit which receives an output signal from the polarity inversion unit 109 and a control signal T2 from a system control unit 121 described later and outputs a tracking control signal to a driving unit 120 and a traverse control unit 116 described later. Reference numeral 111 denotes an addition amplifier to which a detection signal output from the photodetector 105 is input and outputs a sum signal.
12 receives the high frequency component from the addition amplifier 111,
A waveform shaping unit that outputs a digital signal to a reproduction signal processing unit 113 and an address reproduction unit 114 described later. Reference numeral 113 denotes a reproduction signal processing unit that outputs reproduction data to an output terminal.
An address reproduction unit 114 receives a digital signal from the waveform shaping unit and outputs an address signal to an address calculation unit 115 described later. 115 receives an address signal from the address reproduction unit 114 and a control signal T1 from the system control unit 121. , An address calculating unit that outputs an accurate address signal to the system control unit 121.
Reference numeral 116 denotes a traverse motor 117 described later in response to a control signal T3 from a system control unit 121 described later.
A traverse control unit 117 that outputs a drive current to the optical disk 107 is a traverse motor that moves the optical head 107 in the radial direction of the optical disc 100. A recording signal processing unit 118 receives recording data and outputs a recording signal to a laser (LD) driving unit 119 described later. A control signal T4 is output from a system control unit 121 described later, and a recording signal is output from the recording signal processing unit 118. And the semiconductor laser 101
A laser drive unit for inputting a drive current to the laser drive unit. A driving unit 120 outputs a driving current to the actuator 106. Reference numeral 121 denotes a tracking control unit 110, a traverse control unit 116, an address calculation unit 115, and a polarity inversion unit 10.
9. Recording signal processing section 118, control signal T1 to LD drive section
, And T4, and receives the address signal from the address calculation unit 115.

[0004] The operation of the conventional optical disk device configured as described above will be described with reference to FIG. The laser light output from the semiconductor laser 101 is collimated by a collimator lens 102 and is split into a beam splitter 103.
Is converged on the optical disc 100 by the objective lens 104. The laser beam reflected by the optical disc 100 has information of a recording track, and the objective lens 104
Through the beam splitter 103 and the photodetector 105
Guided above. The photodetector 105 converts a change in the light amount distribution of the incident light beam into an electric signal, and outputs the electric signal to the operation amplifier 108 and the addition amplifier 111, respectively. Differential amplifier 10
Numeral 8 performs a current-voltage conversion (IV conversion) of each input current, calculates a difference, and outputs the difference as a push-pull signal. The polarity inverting unit 109 recognizes a track or land accessed by the control signal T1 from the system control unit, and inverts the polarity only when the track is a land, for example. The tracking control unit 110 outputs a tracking control signal to the driving unit 120 according to the level of the input tracking error signal, and the driving unit 120 supplies a driving current to the actuator 106 according to the signal to record the objective lens 104. Control the position across the track. Thus, the light spot scans the track correctly. On the other hand, the addition amplifier 111 performs current-to-voltage conversion (IV conversion) on the output current of the light receiving unit 105, adds the current, and outputs the sum to the waveform shaping circuit 112 as a sum signal. Waveform shaping circuit 1
Numeral 12 data slices the data signal and the address signal of the analog waveform with a certain threshold value to form a pulse waveform, and outputs the pulse waveform to the reproduction signal processing unit 113 and the address reproduction unit 114. The reproduction signal processing unit 113 demodulates the input digital data signal, and thereafter performs processing such as error correction and outputs the reproduced data. Address reproduction unit 114
Demodulates the input digital address signal and outputs it to the address calculation unit 115 as position information on the disk. The address calculation unit 115 calculates the address of the accessed sector based on the address signal read from the optical disc 100 and the land / groove signal from the system control unit 121. The calculation method will be described later. The system control unit 121 determines whether the current light beam is at a desired address based on the address signal. The traverse control unit 116 controls the control signal T from the system control unit 121 when the optical head is moved.
In response to 3, the drive current is output to the traverse motor 117 to move the optical head 107 to the target track. At this time, the tracking control unit 110 also temporarily suspends the tracking servo by the control signal T2 from the system control unit 121. Also, during normal playback,
The traverse motor 117 is driven according to the tracking error signal input from the tracking control unit 110,
The optical head 107 is gradually moved in the radial direction as the reproduction progresses. The recording signal processing unit 118 adds an error correction code or the like to the recording data input during recording, and outputs the recording data to the LD driving unit 119 as an encoded recording signal.
When the system control section 121 sets the LD driving section 119 to the recording mode by the control signal T4, the LD driving circuit 119 modulates the driving current applied to the semiconductor laser 101 according to the recording signal. As a result, the intensity of the light spot irradiated on the optical disc 100 changes according to the recording signal, and recording pits are formed. On the other hand, at the time of reproduction, the LD driver 119 is set to the reproduction mode by the control signal T4, and controls the drive current so that the semiconductor laser 101 emits light at a constant intensity. This makes it possible to detect recording pits and pre-pits on the recording track.

Next, the single spiral land / groove format will be described. In a conventional land / groove recording type optical disk, grooves are continuously formed on the disk, and therefore, grooves are also continuously formed on the disk. FIG. 10 shows a conventional optical disk having a format in which recording tracks in groove portions and recording tracks in the inter-groove portions are alternately connected to form one recording spiral. As shown in FIG. 10, an optical disk having a format in which a recording track in a groove portion and a recording track in the inter-groove portion are alternately connected to form one recording spiral is disclosed in Japanese Patent Application Laid-Open No. 4-38633.
And so on. An optical disk having such a format is referred to herein as a single spiral / land groove format: SS-L / G format. In order to apply tracking servo to the SS-L / G format disk, a connection point connecting the recording tracks of the groove portions and the recording tracks of the inter-groove portions is accurately detected, and then the tracking servo is applied to the groove portions. It is necessary to switch the servo polarity between the recording track and the recording track in the groove.

Now, a method of inserting an identification signal prepit in an optical disk medium driven by the above-described land / groove recording type optical disk apparatus will be described. land/
In the groove recording method, there are known three methods for inserting the identification signal prepit as shown in FIG. FIG. 11A also called a land / groove independent address method.
In the method described in (1), a unique sector address is assigned to each of the land track sector and the groove track sector. If the pit width representing the identification signal is the same as the groove width, the identification signal pre-pits of the adjacent track sectors are connected, and the signal cannot be detected. Therefore, the pit width of the identification signal is smaller than the groove width.
Usually, it is set to about half of the groove width. However, at this time, the grooves and prepits having different widths cannot be continuously formed unless the beam diameters of the beam for cutting the prepits and the beam for cutting the grooves are changed in the process of preparing the master disk of the optical disc. Therefore, the master must be cut using two beams, a groove cutting beam and a pit cutting beam. If the centers of the two beams are displaced, a tracking offset occurs during reproduction of the identification signal prepit and during recording / reproduction of the information recording signal, thereby deteriorating the quality of reproduced data.
Specifically, the error rate increases due to tracking deviation,
This leads to lower data reliability. For this reason, high precision is required for the alignment of the two beams, which causes an increase in cost in the disk master manufacturing process.

In consideration of such circumstances, the groove and the pit can be cut by one beam in view of the accuracy and cost of manufacturing the disk, as shown in FIG.
The method shown in FIG. 1 (c) is desirable. FIGS. 11B and 11C
Shows a method of adding an identification signal pre-pit that can make the groove width and the pre-pit width substantially equal. FIG.
(B) is a conventional optical disk described in Japanese Patent Application Laid-Open No. 6-176404, which is also called a land / groove shared address system. This is a method in which prepits for identification signals are arranged near the center of a pair of adjacent groove tracks and land tracks, and the same identification signal prepits are shared by both tracks.

FIG. 11C shows a time division L / G independent address system. An independent address is added to each of the land track and groove track, provided that the positions of the pre-pits are shifted in the direction parallel to the tracks so that the pre-pits of the identification signal are not adjacent to each other. It is. JP-A-5-282
No. 705 discloses an example.

[0009] Now, the SS-L /
Conventional lands /
When the sector address assignment method applied to the groove disk is applied, the following problems occur. For example, the identification signal prepit is shifted from the center of the groove by a fixed amount (such as 1/4 of the track pitch) from the center of the groove by the method shown in FIG. 11B as described in Japanese Patent Application Laid-Open No. 6-176404. Consider the case. In the optical disk of the SS-L / G format, one for each rotation of the recording track.
At this time, the recording track in the groove portion and the recording track in the inter-groove portion are connected. FIG. 12 shows an arrangement diagram of recording tracks on the disk before and after the connection point in this case. An identification signal pre-pit is added to the front of the recording track of the groove in the recording sector, and the identification signal pre-pit is displaced from the center of the groove in the radial direction, for example, by の of the groove width toward the outer peripheral side. Will be placed. Nothing is recorded at the position of the identification signal pre-pit of the recording track in the inter-groove portion, but the identification signal of the adjacent track on the inner peripheral side (the recording track in the groove portion) is protruding. A light spot scans a recording track to record / reproduce information. The identification signal of the recording track in the groove is detected because the outer half of the light spot is modulated by the preformatted identification signal. While scanning the recording track between the grooves, the identification signal of the track on one inner groove is detected by modulating the inner half of the light spot. Therefore, the same identification signal is read from the recording track in the groove and the recording track in the inter-groove adjacent to the outer periphery. In the optical disk device, the system control unit 121 recognizes whether the optical spot scans the groove or the space between the grooves (that is, the tracking polarity). The address information obtained from a certain identification signal and the control signal T2 coming from the system control unit cause the address calculation unit 1
15 can be performed.

As shown in the figure, the address of the recording sector of the recording track in the groove next to a certain connection point is #n. 1
Assuming that the number of sectors of the recording track is N, once the recording track in the groove on the disk has been followed by one round, the address of the sector of the recording track in the groove before the next connection point is # (n
+ N-1). This sector is connected to the sector of the recording track in the inter-groove portion via the connection point. However, since the address of the sector in the inter-groove portion is common to the sector in the groove portion in contact with the inner peripheral side, the sector is set to #n. Return. Similarly, when the recording track in the space between the grooves is traced once on the disk,
Further, the address is # (n + N-1) in the recording sector in the inter-groove portion before the next connection point. This sector is connected via a connection point to the sector address # (n +
N). In the same manner, N recording sectors in the groove portion and N recording sectors in the inter-groove portion are continuously connected alternately. FIG. 13 shows a change in the recording sector address when the recording spiral is traced in this manner.

In a conventional optical disk such as a compact disk or a magneto-optical disk, only one of the groove and the space between the grooves is used as a recording track. Therefore, in general, an information track forms a single spiral. Address numbers are sequentially assigned to the arranged recording sectors. When accessing a sector, the relationship between the address number and the order before and after the sector was very easy to understand.
On the other hand, when the conventional technique is applied to the SS-L / G recording disk, it is apparent that the relationship between the value of the sector address and the position on the recording spiral does not monotonously change as shown in FIG. Hateful. The read recording sector address is temporarily replaced with an address value indicating the sector order in consideration of the tracking polarity recognized by the device,
For the first time, the order of arrangement on the recording spiral can be understood. Each time an attempt is made to access a specific sector of such an optical disk on the optical disk device, such address calculation is required. In the case of random access, complicated address calculation is required every time, and the load on the device is large.

This burden becomes even more remarkable in formats used for high-density optical disks. The surface of the optical disc is divided into a plurality of zones, and the number of recording sectors constituting one recording track is increased in the zone on the outer peripheral side, that is, a so-called ZCAV (Zone Constant).
Angular Velocity) format and Z
CLV (Zone Constant Linear)
(Velocity) format disc, FIG.
And the number N of sectors per track shown in FIG. 13 varies depending on the radial position on the disk, and therefore, an address corresponding to the arrangement order on the recording spiral is calculated from the recording sector address and the tracking polarity as described above. The computations to perform become even more complicated.

Here, L / L as shown in FIG.
It is also conceivable to apply the G independent address method. In the above-mentioned conventional example, Japanese Patent Application Laid-Open No. 5-282705 does not disclose any information on how to give an address, and thus a specific method of implementation is unknown. It is easily conceivable to assign a continuous address to the. At this time, the relationship between the position on the recording spiral and the recording sector address is the same as that of the land / groove shared address system shown in FIG. The change is as shown in FIG. However, unlike the case of FIG. 11B, it is not necessary to determine the land sector / groove sector from the tracking polarity on the drive device side, and it is slightly different in that it can be determined by the identification signal reproduced from the disk surface. Although progress has been made, it has not been able to solve the above-mentioned problem of complicated address calculation.

Next, problems concerning the servo system will be pointed out.
In the SS-L / G system, recording is performed on both lands and grooves, so that the track density is high. For this reason, if the tracking offset becomes large, the reproduction signal quality deteriorates due to crosstalk from an adjacent track, for example, an error rate increases due to an increase in jitter, and a cross erase occurs in which a part of the adjacent track is erased during recording. Or Since the error signal causing the tracking offset is generated in a combined manner in the optical head system, the track arrangement on the disk, and the servo circuit system, the land track and the groove track generally have different magnitudes. In order to eliminate crosstalk and cross-erase, it is necessary to perform offset compensation of different magnitudes for each track of land and groove. In the conventional land / groove system, that is, in a system in which one recording spiral is constituted by only a groove track and a land track, offset compensation corresponding to each land / groove track is continuously tracked. It took a certain amount of time during the adjustment, and the compensation amount could be maintained after the adjustment, so that the offset compensation could be easily performed. However, in the SS-L / G disk, the switching of the tracking polarity between the land track and the groove track is performed at a high frequency of once per rotation of the disk, so that it is necessary to accurately perform the tracking offset compensation in a short time. .

In the above-described conventional method of inserting an identification signal into land / groove recording, no consideration is given to such offset compensation. For example, in the case of the land / groove shared address method shown in FIG. 11B, during the reproduction of the identification signal, the pits are on only one side, so that the tracking offset is increasing. Also, in the case of the L / G independent address system as shown in FIG. 11C, the same applies to the case shown in FIG. 11B, but it is difficult to detect the tracking offset.

[0016]

The conventional land / groove recording optical disk medium and the conventional optical disk apparatus are configured as described above. Therefore, when the identification signal adding method is applied to the single spiral land / groove recording format as it is, There is a problem that the calculation of the recording sector address is complicated.

In the single spiral land / groove recording format, it is necessary to accurately perform tracking offset compensation in a short time.
There is a problem that it is difficult to detect a tracking offset.

In the single spiral land / groove recording format, a method is required that can easily detect a connection point between a land track and a groove track.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a recording track in a groove portion and a recording track in an inter-groove portion are alternately connected to form one recording spiral. It is an object of the present invention to obtain an optical disk device that can uniquely determine a sector address for an optical disk of the format described above regardless of a groove portion and a groove portion.

It is another object of the present invention to provide an optical disk device which can increase the degree of multiplexing of address information and can easily complement an address even if there is a reading error in the identification information section.

It is a further object of the present invention to provide an optical disk device which can easily confirm whether or not the identification information section in which the sector address is recorded can be read correctly.

[0022]

According to the optical disk apparatus of the present invention, both the groove formed circumferentially on the disk and the inter-groove between the grooves are used as an information recording section, and the information recording section is formed for one round of the disk. A corresponding recording track is composed of an integral number of recording sectors, an identification signal representing address information is preformatted and formed for each recording sector, and the recording tracks of the groove portions and the recording tracks of the inter-groove portions are connected alternately. To form one recording spiral, and a first spiral which is a part of the identification signal is formed.
And a second address information portion, which is another part of the identification signal, is disposed in the other direction in the radial direction from the center of the groove. The first address information section indicates the address of the recording sector in the groove, and the second address information section indicates the gap between adjacent grooves adjacent to the groove. While indicating the address of the recording sector, the address of the recording sector is monotonically increased in the order of being arranged on the recording spiral, regardless of whether the recording sector is a recording sector in a groove or a recording sector in a groove.
Alternatively, in an optical disc apparatus for recording and reproducing an optical disc provided so as to decrease monotonously, a system control section for outputting a control signal indicating a polarity corresponding to a groove or an inter-groove, and a first control signal of the identification signal based on the control signal. And an address extracting section for recognizing one of the address information section and the second address information section as the sector address of the own sector.

According to a second aspect of the present invention, in the optical disk apparatus of the first aspect, if the address information of the own sector cannot be read due to an error, the first address information portion or the second address of the identification signal. It is characterized in that the sector address is complemented by referring to either of the information sections.

According to a third aspect of the present invention, in the optical disk device, both the groove formed circumferentially on the disk and the space between the grooves are used as information recording portions, and the recording tracks corresponding to one round of the disk are integers. A plurality of recording sectors are formed, and an identification signal indicating address information is preformatted and formed for each recording sector, and the recording tracks in the groove portions and the recording tracks in the inter-groove portion are connected alternately to form one recording. A spiral is formed, and the first address information part, which is a part of the identification signal, is disposed with being displaced from the center of the groove by a certain amount in one radial direction, and the first address information part, which is another part of the identification signal, is arranged. The second address information portion is disposed in the other direction in the radial direction from the center of the groove portion and displaced by the same amount as the fixed amount, and the first address information portion represents the address of the recording sector of the groove portion, and 2 address information The portion represents the address of the recording sector in the inter-groove portion adjacent to the groove portion, and the address of the recording sector, regardless of whether the recording sector is a recording sector in the groove portion or a recording sector in the inter-groove portion. In an optical disc device for recording / reproducing an optical disc provided so as to monotonically increase or monotonically decrease in an order arranged on the recording spiral, an address extraction unit for reading the identification signal, a differential amplifier for detecting a tracking error signal, Means for confirming whether or not the identification signal read by the address extraction unit is correct based on a shift of the tracking error signal toward the inner side or the outer side.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings.

Embodiment 1 In the following embodiment, a single spiral land / groove recording (SS-L /
The G) format optical disk will be described. First, the physical layout is shown. FIG. 1 is a schematic diagram for explaining an arrangement of identification number prepits in a recording sector of an optical disk medium according to Embodiment 1 of the present invention and an address value thereof. For SS-L / G format discs,
There are two types of recording tracks, groove portions (grooves, concave portions) and inter-groove portions (lands, convex portions). The two types of recording tracks are connected alternately to form one recording spiral. ing. The recording sector includes a prepitted identification signal and an information recording unit capable of recording user data and various management information. The identification signal is composed of two parts, a front part and a rear part in the scanning direction, and the front part is displaced from the groove toward the outer periphery by half the groove width. The rear portion is displaced from the groove portion by の of the groove width toward the inner peripheral side.

Next, a method of adding the address value of the identification signal will be described. The address of the groove is added to the identification signal immediately before the information recording portion to the front identification signal which is displaced from the center of the groove to the outer periphery by 1/2 of the groove width. Also, the address of the inter-groove portion is included in the identification signal immediately before the information recording portion of one of the recording tracks on the outer peripheral side of the recording track of the inter-groove portion by 、 of the groove width from the groove center on the inner peripheral side. Is added to the rear identification signal arranged to be displaced. As a result, the address of the inter-groove portion is added to the identification signal immediately before the information recording portion to the rear identification signal displaced from the center of the inter-groove portion by 1/2 of the groove width toward the outer peripheral side. Become.

This is because the tracking offset generated during the cutting of the master disc is considered to be smaller when cutting the address of the groove and the address of the space between the grooves when cutting the recording track of the groove. From the tracking offset characteristics, if the tracking offset is smaller when cutting the groove address when cutting the recording track in the groove and cutting the address in the groove when cutting the recording track in the groove, separate them. You just need to cut.

As shown in the figure, when the address of a certain recording sector (groove in this figure) is #m (integer) and the number of sectors constituting one track is M (integer), the sector of address #m is The sector address around the track is # (m + M). If one more round, # (m + 2
M), and thereafter, # (m + 3M), # (m + 4M), and a groove,
The physical shape of the sector alternates with that between the grooves, but the address value changes linearly.

Next, a description will be given of a method of adding an address at a connection portion between a land and a groove, which is arranged once in one round of the disk in the radial direction of the disk and is present. FIG. 2 is a schematic diagram for explaining the arrangement of the identification number prepits in the recording sector at the boundary between the land and the groove of the optical disc medium and the address value thereof according to the first embodiment of the present invention. In the SS-L / G format disc, there is a boundary line where the recording track of the groove portion and the recording track of the inter-groove portion are connected at one place in the radial direction. The arrangement of the identification signal is the same as the arrangement of the identification signal except for the boundary part, and the front part is 1 / of the groove width from the groove.
It is displaced toward the outer peripheral side by two. The rear portion is displaced from the groove portion by の of the groove width toward the inner peripheral side. The address value is added to the front identification signal which is displaced from the groove immediately before the information recording portion to the outer periphery by １ ／ of the groove width in the same manner as the portion other than the boundary portion. Further, the address of the inter-groove portion is added to the rear identification signal which is displaced from the inter-groove portion immediately before the information recording portion by 1/2 of the groove width toward the outer periphery side.

As shown in the figure, if the address of a certain recording sector (groove in this figure) is #n (integer) and the number of sectors in one track is N (integer), the track from the sector of address #n to the track Is the sector address of # (n
+ N). # (N + 2N) when making one more round,
After that, as in the case of # (n + 3N) and # (n + 4N), the physical shape of the sector alternates with the groove portion and the groove portion as in the case other than the boundary portion, but the address value linearly changes. Also, when looking at the continuity before and after the boundary, the sector of the groove is か ら of the groove width from the groove.
The address can be specified from the first half identification signal displaced only to the outer periphery side, and the address of the sector in the inter-slot portion from the second half identification signal displaced from the inter-slot portion to the outer periphery by half the groove width.

FIG. 3 is a diagram showing the relationship between the position on the recording spiral of the optical disk medium according to the first embodiment of the present invention and the recording sector address. Regardless of tracking polarity, that is, regardless of whether the track is a groove or between grooves, a one-to-one address value is obtained. In a conventional optical disk drive for driving a land / groove optical disk medium, there are two types of corresponding areas of a groove and an inter-groove for one physical address.

Next, an apparatus for recording and reproducing the optical disk medium will be described. FIG. 4 is a block diagram showing a configuration of the optical disc device according to the first embodiment of the present invention. FIG.
, 100 is an optical disk, 101 is a semiconductor laser,
102 is a collimating lens, 103 is a half mirror, 1
04 is an objective lens, 105 is a photodetector, 106 is an actuator, 107 is an optical head, 108 is a differential amplifier,
09 is a polarity inversion unit, 110 is a tracking control unit, 11
1 is an addition amplifier, 112 is a waveform shaping unit, 113 is a reproduction signal processing unit, 114 is an address reproduction unit, 116 is a traverse control unit, 117 is a traverse motor, 118 is a recording signal processing unit, 119 is a laser driving unit, and 120 is a laser driving unit. The drive section is basically the same as the conventional optical disk apparatus shown in FIG. 9, and therefore, is denoted by the same reference numerals as the conventional example and detailed description is omitted.

The configuration of a portion different from that of FIG. 9 will be described. Reference numeral 1 denotes an address extraction unit which receives a digital signal from the waveform shaping unit, a tracking error signal from the differential amplifier 108, and a control signal T1 from the system control unit, and outputs an address signal to the address reproduction unit 114 as an address signal. is there. Reference numeral 2 denotes an address extraction unit 1, a polarity inversion unit 109, a tracking control unit 110, a traverse control unit 116, an LD driving unit, and a recording signal processing unit 11.
8 to output the control signals T1 to T4.
15 is a system control unit to which an address signal is input.

The operation of the optical disk device of the first embodiment configured as described above will be described focusing on an address recognition method. Now, it is assumed that the light spot scans the groove. At this time, the system control unit 2 outputs an L level signal corresponding to the groove as the control signal T1 indicating the polarity. The address extraction unit receives this control signal T1, and recognizes that the first half of the identification signal is a sector address between the next grooves. The tracking error at this time indicates that the tracking error signal is largely shifted to the inner circumference because the identification signal of the first half is shifted to the outer circumference of the disk by の of the groove width with respect to the groove. From this, it can be confirmed that the read identification mark is correct.

Conversely, it is assumed that the light spot scans the space between the grooves. At this time, the system control unit 2 outputs an H-level signal corresponding to the gap between the grooves as the control signal T1 indicating the polarity. The address extraction unit receives this control signal T1,
It recognizes that the latter half of the identification signal is the sector address between the next grooves. The tracking error at this time indicates that the tracking error signal is largely shifted to the inner circumference because the identification signal of the latter half is shifted to the outer circumference of the disk by half the groove width with respect to the gap between the grooves. From this, it can be confirmed that the read identification mark is correct.

The address data output from the address extraction unit corresponds to the physical sector address on a one-to-one basis. The address can be uniquely determined.

As described above, the first address information portion, which is a part of the identification signal, is arranged displaced from the center of the groove in one direction in the radial direction by a fixed amount, and the other part of the identification signal is provided. The second address information section is displaced from the center of the groove in the other radial direction by the same amount as the fixed amount, and the address of the recording sector of the groove is recorded by the first address information section. By expressing the address of the recording sector in the inter-groove portion adjacent to the groove in the second address information section, regardless of whether the address value obtained from the identification signal is the groove or the inter-groove, Since there is a one-to-one correspondence with the recording sector, there are two sectors with the same address, such as k (k is an integer) at the address of the groove and k at the address of the groove as in the related art. Disappeared, Despite the less to the groove and the land part so that it is possible to uniquely determine.

Further, the addresses of the recording sectors are assigned so as to increase or decrease monotonically in the order in which they are arranged on the recording spiral, regardless of whether the recording sector is a recording sector in a groove portion or a recording sector in a groove portion. As a result, the address calculation becomes very simple, and the control program of the apparatus and the access control circuit can be simplified.

Further, as other functions and effects,
The track offset correction will be described. When a pair of track offset detection pits displaced by a fixed amount from the track center to the left and right is provided as in a sample servo optical disk, the tracking offset amount can be detected. When the light beam passes through the middle of the track offset detection pit pair, the reproduced signal amplitude of the detection pit pair becomes equal. If the track is off-track to one side, the reproduction signal amplitude of the pit on one side increases and the reproduction signal amplitude of the pit on the other side decreases, so that the amount of track offset of the light beam is detected and corrected. , So that the light beam passes through the center of the track. In the present invention, the same principle and effect can be incorporated into a single spiral land / groove recording format.

Now, it is assumed that the light beam enters the identification signal area of the next groove recording sector from the information recording area in the specific groove recording sector. Since the head of the identification signal is shifted to the outer periphery of the disk by の of the groove width, a tracking error signal corresponding thereto is output. After a while, since there is an identification signal shifted by １ ／ of the groove width on the inner circumference of the disk, a tracking error signal corresponding to the identification signal is output. Ideally, if these two error signals are detected symmetrically, it means that the center of the track is being scanned. Therefore, it is possible to control the servo around the track center by using the repetition of the identification signal shifted to the inner circumference and the outer circumference.

Embodiment 2 An optical disk recording medium according to the second embodiment will be described below.

FIG. 5 is a schematic diagram for explaining the arrangement of the identification number prepits in the recording sector of the optical disk medium according to the second embodiment of the present invention and the address values thereof.
The second embodiment is characterized in that identification signals are multiplexed. As shown in the figure, the identification signal is obtained by recording address information twice in each of the two identification signals (identification signal pairs) at the front and rear portions in the scanning direction shown in FIG. 1 of the first embodiment. is there. The front of the discrimination signal pair is 1 / of the groove width from the groove.
It is the same as the previous embodiment that it is displaced by two to the outer peripheral side and the rear part of the identification signal pair is displaced to the inner peripheral side by １ ／ of the groove width from the groove. Further, in the present embodiment, the recording is performed in a duplex manner, but may be performed in a triple or quadruple manner.

With this configuration, since the address information is multiplexed and recorded, the read error rate of the address information in the identification signal is reduced.

Embodiment 3 An optical disk recording medium according to the third embodiment will be described below. FIG. 6 is a schematic diagram for explaining an arrangement of identification number prepits in a recording sector of an optical disc medium according to Embodiment 3 of the present invention and an address value thereof. The third embodiment is characterized in that identification signals are multiplexed. As shown in the figure, the identification signal is obtained by recording the two identification signals (identification signal pairs) of the front part and the rear part in the scanning direction shown in FIG. The front part of the identification signal pair is displaced from the groove to the outer periphery by half the groove width, and the rear part of the identification signal pair is displaced from the groove to the inner periphery by half the groove width. This is the same as in the previous embodiment. In this embodiment, 2
Although it is recorded as being duplicated, it may be tripled or quadrupled.

With this configuration, since the address information is multiplexed and recorded, the read error rate of the address information in the identification signal is reduced. The difference from the second embodiment is that the reliability of the address information is improved because the addresses of the groove portion and the groove portion are multiplexed and recorded at remote locations. However, since it is necessary to start from the synchronization of the reproduction signal in each address information part,
The disadvantage is that the format overhead is large.

Further, as other functions and effects,
As described in the first embodiment, it goes without saying that the same principle and effect as those used for the sample servo type optical disk can be incorporated in the single spiral land / groove recording format. At this time, by alternately recording a plurality of sets of the first address information portion and the second address information in the identification signal, the time for detecting the tracking error can be extended, and the accuracy can be improved. The identification signal can be used to more easily correct the servo tracking correction.

Embodiment 4 In the first embodiment, an example has been described in which, when one recording track is composed of N recording sectors, the address is set so that the address of the recording sector is increased by N when one track is followed on the recording spiral. . However, if the position on the recording spiral and the recording sector address are assigned so as to increase or decrease monotonically, the address calculation is considerably simplified. In the system configuration, when it is easier to create an access system as a system by skipping the recording sector address on the way, it is possible to assign the address of the recording sector as shown in FIG. FIG. 8 shows the relationship between the position on the recording spiral and the recording sector address.

The fourth embodiment shows an example in which the address is set so that the address of the recording sector is increased by (N + k) when one track is followed on the recording spiral. When two tracks are traced on the recording spiral, the address of the recording sector increases by (2N + 2k). For example, (N + k) is set to be a constant value larger than the recording sector forming one recording track of the outermost zone, and k is reversed in each zone by an amount corresponding to the change in the number N of recording sectors per recording track. By changing this, the difference in the sector address between adjacent tracks can always be kept constant. The light spot can be tracked while tracking the track in the groove,
Since the address information of one adjacent sector is always read, by incorporating such a mechanism, if the address information of the own sector cannot be read due to an error, it can be referred to and complemented. Also, it can be used to read both addresses at all times to increase the degree of multiplexing of address information.

In the ZCAV format and the ZCLV format, the number of recording sectors per track varies depending on the zone on the disk. However, if the length of one track varies depending on the zone, address management of a connection point between a land track and a groove track becomes complicated. Become. At this time, address management can be simplified by using the method described in the fourth embodiment.

Even in this case, regardless of whether the address value obtained from the identification signal is a groove or a groove, the address and the recording sector have a one-to-one correspondence. A feature that eliminates the fact that there are two sectors having the same address in each section and allows the sector address to be uniquely determined regardless of the groove portion and the inter-groove portion is as follows.
Nothing is lost.

[0052]

Since the present invention is configured as described above, it has the following effects.

In the optical disk device according to the first aspect of the present invention, the address of the sector being scanned can be uniquely determined by using the control signal indicating the tracking polarity in the single spiral land / groove recording format. . Also, the address of the recording sector
Whether the recording sector is a groove sector or a groove sector.
Regardless of the recording sector, lined up on the recording spiral
In a monotonically increasing or monotonically decreasing order.
Address calculation becomes very easy and the device control
Control programs and access control circuits can be simplified
You.

In the optical disk device according to the second aspect of the present invention, the multiplexing degree of the address information is increased so that the address can be easily complemented even if there is a reading error in the identification information section.

In the optical disk device according to the third aspect of the present invention, it is possible to easily confirm whether the identification information section in which the sector address is recorded can be read correctly by using the direction of the deviation of the tracking error signal. .

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining an arrangement of identification number prepits in a recording sector of an optical disk medium according to a first embodiment of the present invention and an address value thereof;

FIG. 2 is a schematic diagram for explaining an arrangement of identification number prepits in a recording sector and an address value thereof at a boundary between an optical disk medium land and a groove according to the first embodiment of the present invention;

FIG. 3 is a diagram illustrating a relationship between a position on a recording spiral of the optical disc medium according to the first embodiment of the present invention and a recording sector address.

FIG. 4 is a block diagram illustrating a configuration of the optical disc device according to the first embodiment of the present invention;

FIG. 5 is a schematic diagram for explaining an arrangement of identification number prepits in a recording sector of an optical disc medium according to a second embodiment of the present invention and an address value thereof;

FIG. 6 is a schematic diagram for explaining an arrangement of identification number prepits in a recording sector of an optical disc medium according to Embodiment 3 of the present invention and an address value thereof;

FIG. 7 is a schematic diagram for explaining an arrangement of identification number prepits in a recording sector of an optical disc medium according to a fourth embodiment of the present invention and an address value thereof;

FIG. 8 is a diagram showing a relationship between a position on a recording spiral of an optical disc medium according to a fourth embodiment of the present invention and a recording sector address.

FIG. 9 is a block diagram showing a configuration of a conventional optical disc device.

FIG. 10 is a view showing a conventional optical disc having a format in which recording tracks in groove portions and recording tracks in the inter-groove portion are alternately connected to form one recording spiral.

FIG. 11 is a diagram showing how to insert an identification signal prepit in a conventional land / groove recording method.

FIG. 12 is a schematic diagram for explaining a conventional arrangement of identification number prepits in a recording sector and an address value at a boundary line between a land and a groove of an optical disk medium.

FIG. 13 is a diagram showing a relationship between a position on a recording spiral of a conventional optical disk medium and a recording sector address.

[Explanation of symbols]

1 address extraction unit, 2 system control unit, 1
00 optical disk, 101 semiconductor laser, 102 collimating lens, 103 half mirror, 104 objective lens, 105 photodetector, 106 actuator,
107 optical head, 108 differential amplifier, 109 polarity inverting section, 110 tracking control section, 111 addition amplifier, 112 waveform shaping section, 113 reproduction signal processing section,
114 address reproducing unit, 115 address calculating unit, 11
6. Traverse control unit, 117 traverse motor, 11
8 Record signal processing unit, 119 laser drive unit, 120 drive unit, 121 system control unit.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kenji Goshima 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Electric Corporation (72) Inventor Yoshinobu Ishida 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi (56) References JP-A-6-106579 (JP, A) JP-A-6-325368 (JP, A) JP-A-64-59632 (JP, A) International Publication 96/25736 (WO, A1) Kazuhiko Nakane, 6 others, "Single Spiral-Access Method for Land Groove Recording", Television Technical Report, February 29, 1996, Vol. 20, No. 16, pp. 29 −34 (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B ^7/ 00-7/013 G11B 7/09-7/095 G11B 20/12 G11B 27/10

Claims (3)

(57) [Claims] An information recording section includes both a groove formed circumferentially on a disk and an inter-groove between the grooves, and a recording track corresponding to one round of the disk is composed of an integer number of recording sectors. An identification signal representing address information is preformatted and formed for each recording sector, and a recording spiral in the groove portion and a recording track in the inter-groove portion are alternately connected to form one recording spiral. The first address information part, which is a part of the identification signal, is arranged displaced from the center of the groove in one radial direction by a fixed amount, and the second address information part, which is another part of the identification signal, is disposed in the groove. Disposed in the other direction in the radial direction from the center by the same amount as the fixed amount, the first address information section represents the address of the recording sector of the groove, and the second address information section represents the address of the groove. Of the groove adjacent to In addition to indicating the address of the recording sector, the address of the recording sector is monotonically increased in the order in which the recording sector is arranged on the recording spiral, regardless of whether the recording sector is a recording sector in a groove portion or a recording sector in a groove portion. Alternatively, in an optical disc apparatus for recording and reproducing an optical disc provided so as to decrease monotonously, a system control section for outputting a control signal representing a polarity corresponding to a groove or an inter-groove, and a first control signal of the identification signal based on the control signal. An optical disc drive comprising: an address extracting unit for recognizing one of the address information unit and the second address information unit as the sector address of the own sector. 2. When the address information of the own sector cannot be read due to an error, the sector address is complemented by referring to either the first address information portion or the second address information portion of the identification signal. The optical disk device according to claim 1, wherein: 3. An information recording section including both a groove formed circumferentially on a disk and an inter-groove between the grooves, and a recording track corresponding to one round of the disk is composed of an integral number of recording sectors. An identification signal representing address information is preformatted and formed for each recording sector, and a recording spiral in the groove portion and a recording track in the inter-groove portion are alternately connected to form one recording spiral. The first address information part, which is a part of the identification signal, is arranged displaced from the center of the groove in one radial direction by a fixed amount, and the second address information part, which is another part of the identification signal, is disposed in the groove. Disposed in the other direction in the radial direction from the center by the same amount as the fixed amount, the first address information section represents the address of the recording sector of the groove, and the second address information section represents the address of the groove. Of the groove adjacent to In addition to indicating the address of the recording sector, the address of the recording sector is monotonically increased in the order in which the recording sector is arranged on the recording spiral, regardless of whether the recording sector is a recording sector in a groove portion or a recording sector in a groove portion. Alternatively, in an optical disc apparatus for recording / reproducing an optical disc provided so as to decrease monotonously, an address extraction unit for reading the identification signal, a differential amplifier for detecting a tracking error signal, and an inner or outer circumference of the tracking error signal. Means for confirming whether or not the identification signal read by the address extraction unit is correct based on the deviation.