JP3462882B2 - Optical disk device and information processing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention relates to an information recording apparatus, for example an optical disk device, or relates to an information reproducing method, in particular recording and reproducing and the generation of the optical disc, the previous generation of the optical disc
Suitable optical disk apparatus in order to compatibility information reproducing
Regarding the method .

[0002]

2. Description of the Related Art As a conventional disk format,
ISO / IEC JTC1 / SC23N and D
The 130 mm diameter optical disc format described in IS10089 is known. The format is 1
The user bytes of a sector are 1024 bytes, and the total number of bytes including pre-format and other overhead is 13
The format is 60 bytes and the number of sectors in one track is 17 sectors, and the user bytes in one sector are 512 bytes.
Two types of formats are proposed, in which the total number of bytes including overhead is 746 bytes and the number of sectors in one track is 31 sectors.

Since the above-mentioned format was first standardized for a 130 mm diameter optical disc, it was not necessary to consider compatibility of the format with respect to the previous model.

In the above format, the modulation method is 2
The -7 modulation method is adopted, and the position recording method in which the code word after modulation, that is, the code word 1 is made to correspond to the center position of the pit on the optical disk is used.

On the other hand, as a format adopting the pit edge recording system (or mark edge recording system) in which the code word 1 corresponds to the leading edge and the trailing edge of the pits on the optical disk, it is described in JP-A-02-228128. Of 30
There is a format compatible with 0 mm diameter optical disks. Although there is a 300 mm diameter optical disc format before this format as well, since the recording system is different, compatibility regarding the format is not particularly considered.

[0006]

In the format having the above-mentioned structure, even if the optical discs have the same diameter, the recording method and the recording density are different, so that the compatibility cannot be ensured by the same circuit. was there.

In the present invention, especially for an optical disc having a diameter of 130 mm, the channel clock generating circuit can be shared between the optical disc of the format using the mark edge recording system and the optical disc using the above-mentioned position recording system. It provides the format.

Here, an optical disc having a diameter of 130 mm is given as an example, but the method described in the present invention can be realized without depending on the disc diameter and the modulation system.

[0009]

As means for solving the above problems, there are the following two types of methods. One is a method in which the number of sector bytes in one of the formats is set to an integral multiple of the number of bytes in the other, or a neighborhood value. Generally, the format adopted in advance does not change, so the format in the subsequent line is changed. As the simplest means of implementation, if the linear recording density of the new format is made twice the existing linear recording density, when the disks of both formats are rotated at the same rotation speed, the frequency of the channel clock is also doubled. Therefore, the compatibility of the channel clocks can be obtained by dividing the channel clock generated by the device compatible with the new format by two.

As another means, there is a method of making the channel clock frequencies compatible by making the rotational speeds different for the disks of both formats. In the simplest embodiment, if the rotational speeds of the two types of discs having the above-described formats are made different by twice, a single channel clock generation circuit can be used.

In the present invention, based on the above basic idea, as a concrete example, an MCAV (Modified-Constant-Angular-Velocity) method or a ZCAV (Zone-Constant-Angular-Velocit) method is applied to a 130 mm diameter optical disk.
A method for ensuring the compatibility of the channel clock generation means will be presented by taking as an example a format in which the storage capacity is increased by the y) method and the linear recording density is increased by the mark edge recording method.

[0012]

By using the above means, it is possible to generate a clock having a frequency compatible with the conventional format disk even by the channel clock generating means corresponding to the new format. The compatibility here means that the channel clock frequencies are equal to each other or that the clock frequencies are in an integer ratio relationship. However, PLL (Phase-Locked-Loo) that generates a channel clock for data reproduction is used except when exactly equal.
p) There is no problem if it is within the frequency range (capture range) that can be fully pulled in by the circuit.

[0013]

EXAMPLES Examples of the present invention will be described below. Figure 1
ZCA of 130 mm optical disc for implementing the present invention
It is the figure which showed the structure in 1 sector of the format corresponding to V (Zone-Constant-Angular-Velocity). FIG. 1 shows a format for realizing a user capacity of 1024 bytes.
The ZCAV format divides the recording area on the disc into a plurality of zones in the radial direction and changes the frequency of the recording / reproducing clock for each zone to make the linear recording density in each zone substantially constant. , The storage capacity of the entire disc can be increased. For example, if the ZCAV format is applied when the outermost circumference diameter is twice the innermost circumference diameter of the disc recording area, the conventional C
The storage capacity in the AV format can be increased about 1.5 times.

In the format of FIG. 1, the pre-formatted area is 63 bytes and is an area in which the track address and the sector address are recorded in advance. ALPC (Auto-Lase
r-Power-Control) area is 2 bytes, ODF (Offset-Dete)
2 bytes are provided for the ction-field) area. In addition, a GAP of 3 bytes each is provided before and after the ALPC in order to prevent an area identification error due to a rotation fluctuation or the like. This area consists of 10 bytes. The data area consists of 1328 bytes, the VFO3 entrainment pattern area for reproduction clock generation synchronization is 26 bytes, the SYNC area for specifying the start of demodulation is 4 bytes, and the user data 10
In addition to 24 bytes, CRC (Cyclic-Redundancy-Chec
k), a total of 39 RESYNC pattern 2 bytes for resynchronization, and ECC (Error-Correction-Code). The number of sector bytes in FIG. 1 is 1401 bytes.

FIG. 2 is a diagram showing a sector format of the current 130 mm ISO standard. The format of FIG. 2 is for realizing a user capacity of 1024 bytes, and one sector is composed of 1360 bytes. For detailed explanation, see Document No. ISO / IEC JTC 1
/ SC 23N 292, the description here will be made only with respect to the present invention.

FIG. 3 is a diagram showing a sector format of the ZCAV format of the 300 mm optical disk disclosed in Japanese Patent Laid-Open No. 02-228128. FIG. 4 is a diagram showing a track format among the formats. The formats shown in FIGS. 3 and 4 are formats corresponding to mark edge recording in which code words are associated with the leading edge and trailing edge of a recording mark. The format shown in FIG. 1 is based on the 300 mm ZCAV format shown in FIG. 3 in consideration of compatibility with the 130 mm ISO standard format shown in FIG. 2 regarding the reference frequency.

FIG. 5 shows a ZCAV-compatible sector format when the user data capacity is 512 bytes based on the same concept as in FIG.

FIG. 6 shows ISO / IEC JTC 1 / SC.
This is a sector format with a user capacity of 512 bytes disclosed in 23N 292.

The sector formats shown in FIGS. 1 and 5 differ from the formats shown in FIGS. 3 and 4 in the following points.

In the formats shown in FIGS. 1 and 5, 1-7 modulation is used as the modulation method. Since the modulation method itself is well known, description thereof will be omitted. However, in the formats shown in FIGS. 2 and 3, the point that the shortest mark length (1.5 times the data bit length) is long is evaluated, and 2-7 modulation is performed. I am using. In contrast, 1-7 modulation has a shortest mark length (1.33 times the length of data bits), but the detection window width is wider than that of the 2-7 modulation (0.5 times the length of data bits) ( Since it is 0.67 times as long as the data bit), it is possible to realize highly reliable modulation / demodulation with respect to an error due to an unerased residue that may occur in an erasable medium and a signal level variation due to optical system variation and the like. . By the way, Figures 2 and 6
The modulation method in the format of 130 mm ISO standard shown in 2 is the 2-7 modulation method, and the mark position recording method in which the code word is associated with the center position of the mark is used.

The configuration of each part of the sector formats shown in FIGS. 1 and 5 will be described below. FIG. 7 shows an example of the data pattern of each part. Regarding the function and purpose of each part, the above-mentioned JP-A-02-228128, ISO / I
Since it is described in the EC standard, only a brief explanation will be given.

First, the ID in the preformat area is 2
It is overwritten. The number of sectors on a 130 mm optical disk does not exceed 127 even in the ZCAV method, so 7 bits are assigned to the sector address, and 1 bit is assigned as an ID number for identifying ID1 and ID2, that is, 8 bits, that is, 1 byte. .

VFO1, VFO2, and VFO3 use the repetition of 101 which is the closest pattern in the 1-7 modulation method. VFO1 is 010101010101 is 1
As bytes, 28 bytes in 1024 user byte format and 2 in 512 user byte format
It consists of 6 bytes. Similarly, each VFO2 is 2
It consists of 2 bytes and 20 bytes.

Here, the leading 3 bits of VFO2 are changed by the data pattern of the last 3 bits of the immediately preceding ID1 as described in XXX. This is a characteristic of the 1-7 modulation method and is not particularly attributable to the present invention. VF
O3 is recorded at the beginning of the data area, and the pattern itself is the same as VFO1. VFO described here
The number of bytes of the pattern is different between the 1024 user byte format and the 512 user byte format. This is a measure taken to make the recording / reproducing clock frequency compatible with the current 130 mm ISO standard format, as described later. Since the VFO pattern is more redundant than patterns of other parts, even if the number of bytes is increased or decreased, it does not affect the logic for recording / reproduction except for management of the number of bytes. This is because it is suitable for adjusting In FIG. 7, 1
According to the modulation rule of the -7 modulation method, 3 code word bits (channel bits) correspond to 2 data word bits, and therefore 12 channel bits correspond to 1 byte of data byte. That is why.

AM (Address-Mark) is a pattern for providing a demodulation start reference for the reproduction of the subsequent ID. By using an irregular pattern for the modulation method used, AM (Address-Mark) is compared with other normal data patterns. Make a distinction. Further, in order to specify the reference position, it is necessary to select a pattern in which the detected position of the data pattern does not change depending on the data patterns before and after the AM. In FIGS. 1, 5, and 7, a 1-byte pattern consisting of 0000000010X0 is used. The second channel bit from the end is X, but this is also due to the property peculiar to the 1-7 modulation, and 0 or 1 is applied depending on the surrounding data pattern. Regardless of whether the bit is 0 or 1, the demodulation start position does not shift.

The ODF is an area for detecting and correcting the track offset amount, and is composed of 2 bytes with no track guide groove and no data. As a function, 130m
This is equivalent to the mISO standard, and in FIG. 3, TOF (Track-OFf
set) corresponds to the area. SYNC (Synchronize-Patt
ern) is a pattern composed of 4 bytes, that is, 48 channel bits. The function is to specify the start of demodulation of the user data area as in the conventional case. Conventional SY
The NC pattern has been increased from 3 bytes to 4 bytes in order to ensure the orthogonality equivalent to that of the 2-7 modulation method even in the 1-7 modulation method. Orthogonality is
This is realized by selecting a pattern sequence in which the detection probability takes a maximum value when all the previous 12 blocks are normally detected when the SYNC pattern is one block for every 4 channel bits. In 2-7 modulation, a 1-byte data word corresponds to a 16-channel-bit code word, and thus a 3-byte data word corresponds to a 48-channel-bit code word. On the other hand, in 1-7 modulation, since a 1-byte data word corresponds to a 12-channel bit code word, a 4-byte data word is required to generate a 48-channel bit code word. SY
NC has 4 bytes.

Next, the data structure in the data area will be described with reference to FIGS. 8 and 9. FIG. 8 shows the user 102
4 byte format, FIG. 9 shows the data structure in user 512 byte format, 130 mm ISO
It has the same configuration as the LDC (Long-Distance-Code) used in the above. However, the RESYNC (Resynchronize-Pattern) pattern used as the data resynchronization pattern is composed of 2 bytes, and is inserted every 30 bytes in FIG. 8 and every 20 bytes in FIG. 9. The frequency of insertion of this RESYNC pattern is ECC (Error-Cor
It is determined from the relative relationship between the error correction capability of the rection code) and the disk defect rate. The higher the insertion frequency, the lower the error correction capability of the ECC is, but the format efficiency is decreased. On the other hand, if the insertion frequency is low, the ECC requires a high error correction capability, and the ECC data amount increases. Therefore, it is necessary to optimize the disc quality.

An object of the present invention is to ensure the compatibility of the recording / reproducing clock frequency even when reproducing a disk of the current 130 mm ISO standard in the 130 mm ZCAV format. The channel clock frequency in each ZCAV zone when the sector formats shown in FIGS. 1 and 5 are used will be described below. When the track pitch is set to 1.35 μm, the bit pitch in the entire recording radius area is made substantially uniform, and the number of sectors per track is increased by 1 for each zone increase on the outer peripheral side.
Insert a condition to increase the bit pitch by 0.5
When set to 6 μm, the innermost radius of a 130 mm optical disk is about 30 mm. Therefore, considering that the number of sectors in one track is an integer condition, the innermost zone (1
Zone No. 29 in the case of 024 user byte format, No. 53 in the case of 512 user byte format
The number of sectors in the zone is 30 in the 1024 byte format and 54 in the 512 byte format. FIG. 10 shows the number of sectors per track and the VFO clock frequency in each zone corresponding to the 1024 user byte format corresponding to FIG. The rotation number of the disk here is 3000 rpm.

It should be noted that other rotational speeds do not hinder the purpose of the present invention. The VFO clock frequency is also the channel clock frequency. , Figure 1
1 and FIG. 12 show the number of sectors per track and the clock frequency in each zone in the 512 user byte format corresponding to FIG. Note that FIG. 10 and FIG.
In FIG. 1 and FIG. 12, zone number 0 is the outermost zone. In the case of the ZCAV system, the outermost circumference where the linear velocity is the highest has a high data transfer rate, so that it corresponds to the youngest zone number.

FIG. 13 shows 1 of the current 130 mm ISO standard.
024 user byte format optical disc 300
6 is a table showing a VFO clock frequency when rotated at 0 rpm and a frequency twice as high as the clock frequency. Similarly, FIG. 14 is a diagram showing frequencies when an optical disk of 512 user byte format is rotated at 3000 rpm.

Since the bit pitch of the optical discs having the specifications shown in FIGS. 1 and 5 is 0.56 μm, the innermost bit pitch of the current 130 mm ISO standard is 1.02.
Since the linear recording density is increased to about 1.8 times that of μm and the modulation method is also changed, the channel clock frequency at the same rotation speed is low in both cases of FIG. 13 and FIG. ing. In order to make the clock frequencies compatible with FIG. 1 and FIG. 2 and FIG. 5 and FIG. 6, the channel clock frequencies of FIG. 1 and FIG. 5 and the channel clocks of FIG. 2 and FIG. It is effective to make the frequency twice as high as possible. In the present embodiment, in the 1024 user byte format shown in FIG. 13, the double frequency of the channel clock is 36.992.
0 MHz is the 15th of the channel clock shown in FIG.
The zone frequency of 36.9864 MHz is the closest frequency zone. At this time, the difference between the two frequencies is 0.0
It fits in 15%. Similarly, 2 of the channel clock of FIG.
For the doubled frequency of 37.0016 MHz, FIG.
1, the channel clock frequency 37.0194 MHz in the 28th zone in FIG. 12 is the closest frequency,
At this time, the difference between them is 0.048%.

In the case of the ZCAV system, the number of zones that can be pulled in by the VFO circuit for generating the reproduced clock cannot be increased so much as to prevent the slip phenomenon at the time of pulling.

For example, a zone that differs by ± 1 clock from the number of clocks to be generated within the period of the VFO pull-in pattern with respect to the channel clock frequency of the zone cannot be set as the pull-in zone range. Therefore, in general, the capture range is about two zones including the relevant zone. In order to shorten the pull-in time and prevent locking to an erroneous frequency, the clock signal of the reference frequency is input from the clock generation synthesizer to the VFO circuit in advance, and the data string to be actually reproduced is input. After that, it is effective to perform a switching operation to synchronize with the data pulse train.
By selecting the frequency of such a zone, ZC
In the case of recording / reproducing on / from an AV-compatible device using a disk of the current 130 mm ISO standard,
The zone and 28th zone channel clocks are generated in advance, and the clock obtained by dividing the clock by 2 is currently used for 130m.
It can be used as a channel clock for an mISO standard disc. As a result, the circuit for generating the reference clock need only be the one for ZCAV, and the circuit scale can be reduced.

In the present embodiment, the case of a 130 mm disc has been described as an example, but the method of the present invention can be used regardless of the disc diameter or the disc rotation speed. Normally, this is rarely done, but the ZCAV system disk and the current I
Even when an SO standard disc is handled at a different rotation speed, the channel clock frequency generation circuit can be shared by setting the format in which the total number of bytes in one sector is corrected in the same manner. It is convenient to adjust the total number of bytes in one sector by the VFO data pattern having high redundancy as described above, or by the BUFF (Buffer) section at the end of the data area.

In the above discussion, the method for ensuring the compatibility of the channel clock frequencies when the current ISO standard disk and the disk of the format shown in FIG. 1 and FIG. 5 are rotated at the same rotation speed has been described. . Another way to ensure channel clock frequency compatibility is:
This is a method in which the number of rotations of the disk of the current ISO standard is different from that of the disk presented in FIGS. 1 and 5.
In this case, it is more convenient to make the preformat areas in the 1024 user byte format and the 512 user byte format shown in FIG. 1 and the ODF / ALPC area, and the number of bytes of VFO3 common.
FIG. 15 shows a configuration example of the sector format in such a case.
And shown in FIG. 15 shows the case of 1024 user byte format, and FIG. 16 shows the case of 512 user byte format.

FIG. 17 shows a case where frequencies corresponding to the number of zones shown in FIGS. 10 to 12 are obtained by using the sector format of FIG. In FIG. 17, zone number 1
Focusing on the clock frequency of 36.7775 MHz of 5, the current ISO standard disk is 2982.42 rpm.
When rotated with, the current IS is 36.7775MHz.
It is a double frequency of the channel clock frequency in the O standard disc. Alternatively, focusing on the clock frequency 37.6110 MHz of zone number 14 in FIG.
This can be dealt with by rotating a standard disc at 3050.2 rpm. Similarly, in the case of the 512 user byte format, the compatibility of the channel clock frequencies can be obtained by changing the rotation speed. 51
As a calculation example regarding the 2-user byte format,
The clock frequency of zone number 28 is 36.972 MHz
In this case, the current ISO standard disc is 299
Compatibility can be secured by rotating at 7.6 rpm. By the way, the clock frequency of zone number 27 is 37.44.
Thinking in MHz, the current ISO standard disc 303
It may be rotated at 5.5 rpm. Of course 3000
If the number of rotations around the rpm is not particular, the same effect can be obtained by setting the number of rotations so as to match the frequency for other zones.

[0037]

According to the present invention, with respect to the channel clock frequency, the same clock generation means can be used to generate channel clocks for discs of different formats without any problems, which is effective in reducing the circuit scale. is there.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a sector format corresponding to 1024 user bytes presented in the present invention.

FIG. 2 is a sector format diagram corresponding to 1024 user bytes of 130 mm diameter ISO standard.

FIG. 3 is a sector format diagram compatible with a 300 mm diameter mark edge recording system.

FIG. 4 is a track format diagram corresponding to the format presented in FIG.

FIG. 5 is a sector format diagram corresponding to 512 user bytes presented in the present invention.

FIG. 6 is a sector format diagram corresponding to 512 user bytes of 130 mm diameter ISO standard.

FIG. 7 is a data configuration diagram in the formats shown in FIGS. 1 and 5.

FIG. 8 is a data configuration diagram in the data area of FIG.

9 is a data configuration diagram in the data area of FIG.

10 is a table showing the number of zone divisions and the clock frequency in each zone corresponding to FIG.

11 is a table showing the number of zone divisions corresponding to FIG. 5 and the first half zone portion of the clock frequency in each zone.

FIG. 12 is a table showing the number of zone divisions corresponding to FIG. 5 and the second half zone portion of the clock frequency in each zone.

FIG. 13 is a table showing clock frequencies corresponding to FIG. 2.

14 is a table showing clock frequencies corresponding to FIG.

FIG. 15 is a configuration diagram showing a second configuration example of a sector format corresponding to 1024 user bytes presented in the present invention.

FIG. 16 is a configuration diagram showing a second configuration example of a sector format corresponding to 512 user bytes presented in the present invention.

FIG. 17 is a table showing the number of zone divisions corresponding to FIG. 15 and the latter half zone portion of the clock frequency in each zone.

   ─────────────────────────────────────────────────── ─── Continued front page       (56) Reference JP-A-4-192164 (JP, A)                 JP 63-152058 (JP, A)                 JP 62-62474 (JP, A)                 JP-A-4-61073 (JP, A)                 JP-A-2-162578 (JP, A)

Claims (6)

(57) [Claims] 1. A first optical disk and the optical disk apparatus for recording information on a second optical disk, the first optical disk is zoned in the radial direction,
The zone has a plurality of tracks, the zone has a plurality of sectors, and means for generating a clock of a predetermined channel clock frequency used when recording information on the first optical disc; The optical disc has a format different from the format of the first optical disc, and is used when recording information on the second optical disc. And a means for generating the clock of the optical disk device. 2. The second optical disc also has a plurality of sectors, and the number of bytes of the sector of the first optical disc is an integer multiple of the number of bytes of the sector of the second optical disc. The optical disk device according to claim 1. 3. The optical disk apparatus according to claim 1 , further comprising a rotating means for rotating the second optical disk at a rotation speed for rotating the first optical disk. 4. An information reproducing method for reproducing the first information recorded on the first optical disc and reproducing the second information recorded on the second optical disc, wherein the first optical disc comprises: Radially zoned,
The zone has a plurality of tracks, the zone has a plurality of sectors, generates a first clock of a predetermined channel clock frequency, and records the first clock on the first optical disc using the first clock. And reproducing the recorded information, wherein the format of the second optical disc is different from the format of the first optical disc, and the second clock has a channel clock frequency that is an integral multiple or a fraction of the predetermined channel clock frequency. And reproducing the information recorded on the second optical disc by using the second clock. Wherein said second optical disc also has a plurality of sectors, the number of bytes of a sector of the first optical disc is characterized in that it is an integral multiple of bytes in a sector of the second optical disk The information reproducing method according to claim 4. 6. In the rotational speed for rotating the first optical disc, the second information reproducing method according to claim 4, wherein the rotating the optical disc.