JPH11213543A - Optical disk and optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk device capable of processing an optical disk device without receiving adverse effect caused by detecting an unstable header field. SOLUTION: An optical disk device, which reproduces various data containing header data from an optical disk having a data recording area (RE1) for recording or reproducing thereon, based on the header data recorded on the header field which is a header field(HF1) recording the header data thereon and is a field following the header field and written thereon, is provided with a reproducing means 38 for reproducing the header data from the optical disk, and a pseudo-header signal output means 124 for outputting the pseudo-header signal for showing pseudo detection of the header field based on a prescribed data contained in reproduced header data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a DVD (Digital Video Disk) -RAM (rand) for recording predetermined information.
Optical discs such as om access memory). In addition, the present invention relates to an optical disk device that reproduces data recorded on an optical disk and records data on the optical disk.

[0002]

2. Description of the Related Art Generally, a groove track is formed on an optical disk by discontinuous spiral grooves. A track corresponding to a position between groove tracks is called a land track. A header field is formed between tracks. In this header field, header data relating to a land track or groove track area (recording field) following this header field is emboss-recorded. The header data is arranged in a staggered manner with respect to the land track and the groove track.

The reflected light of the light beam applied to the header field has certain characteristics due to the influence of header data arranged in a staggered manner in the header field.
Conventionally, the header field has been detected by detecting this feature. When the header field is detected, various data included in the header data of the header field is detected. Then, a recording field is reproduced based on the detected various data. Alternatively, data is recorded in a recording field.

[0004]

However, in the conventional header field detection as described above, since the header field is detected from a relatively unstable element such as a characteristic of reflected light, there is a problem in detection accuracy. If the detection reliability of the header field is low as described above, there may be a problem that the reproduction of the recording field or the recording of data in the recording field cannot be performed normally.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical disc apparatus capable of normally reproducing data recorded in a recording field and recording data in the recording field without being adversely affected by the detection of an unstable header field. Is to provide.

[0006]

In order to solve the above-mentioned problems and achieve the object, an optical disk apparatus according to the present invention is configured as follows.

According to the present invention, there is provided a header area (HF1) in which header data is recorded, and a data recording area which follows the header area and receives or records data based on the header data recorded in the header area. In an optical disc apparatus for reproducing various data including the header data from an optical disc having an area (RE1), a reproducing means (38) for reproducing the header data from the optical disc, and a header included in the header data reproduced by the reproducing means. A pseudo-header signal output means (12) for outputting a pseudo-header signal at a predetermined timing indicating that the header area has been pseudo-detected based on the predetermined data to be output.
4).

The present invention has a header area in which header data is recorded, and a data recording area following the header area and receiving or recording data based on the header data recorded in the header area. In an optical disc apparatus for reproducing various data including the header data from an optical disc, a first reproducing means for reproducing the header data from the optical disc; and a predetermined reproducing means included in the header data reproduced by the first reproducing means. Based on the data, a pseudo-header signal output means for outputting at a predetermined timing a pseudo-header signal indicating that the pseudo-header area has been detected, based on the pseudo-header signal output by the pseudo-header signal output means,
A second method for reproducing data recorded in the data recording area;
Reproduction means.

The present invention has a header area in which header data is recorded, and a data recording area following the header area and receiving or recording data based on the header data recorded in the header area. In an optical disc apparatus for reproducing various data including the header data from an optical disc, a reproducing means for reproducing the header data from the optical disc, and a pseudo data based on predetermined data included in the header data reproduced by the reproducing means. A pseudo-header signal output means for outputting a pseudo-header signal indicating that the header area has been detected at a predetermined timing; and Recording means for recording data.

According to the present invention, first header data (header 1 field) including first identification data (PID1) indicating the first header data, and substantially the same as the first header data Identification data (PID) indicating that the data is unique data and the second header data.
Second header data including 2) (Header 2 field)
Is recorded in a header area (header field HF1),
And the header data from an optical disc having a data recording area (recording field RE1) that is an area following the header area and that receives or records data based on the first and second header data recorded in the header area. In an optical disk apparatus for reproducing various data including: a reproducing unit for reproducing the first and second header data from the optical disk; and the reproducing unit reproduces the first identification data included in the first header data. At the time of reproduction, a first pseudo header signal indicating that the header area has been detected in a pseudo manner is output at a first timing based on the first identification data, and the reproduction means outputs the first header signal. The first identification data included in the data is not reproduced and is not included in the second header data. When the second identification data is reproduced, a pseudo-header signal output for outputting at a second timing a second pseudo-header signal indicating that the header area has been pseudo-detected based on the second identification data. Means.

According to the present invention, first header data including first identification data indicating the first header data,
A header area in which second header data including substantially the same data as the first header data and second identification data indicating the second header data is recorded, and the header area Optical disc device for reproducing various data including the header data from an optical disc having a data recording area for receiving or recording data based on the first and second header data recorded in the header area A first reproducing means for reproducing the first and second header data from the optical disc; and the first identification data included in the first header data is reproduced by the first reproducing means. Sometimes, based on the first identification data, a first pseudo header signal indicating that the header area has been detected in a pseudo manner is transmitted to the first timing. The first identification data included in the first header data is not reproduced by the first reproducing means, and the second identification data included in the second header data is reproduced. A pseudo-header signal output means for outputting at a second timing a second pseudo-header signal indicating that the header area has been pseudo-detected based on the second identification data; The first and second signals outputted by the output means;
And a second reproducing means for reproducing data recorded in the data recording area based on one of the pseudo header signals.

According to the present invention, first header data including first identification data indicating the first header data,
A header area in which second header data including substantially the same data as the first header data and second identification data indicating the second header data is recorded, and the header area Optical disc device for reproducing various data including the header data from an optical disc having a data recording area for receiving or recording data based on the first and second header data recorded in the header area A reproducing means for reproducing the first and second header data from the optical disc; and when the first identification data contained in the first header data is reproduced by the reproducing means, At a first timing, a first pseudo header signal indicating that the header area has been detected in a pseudo manner is output based on the identification data. When the second identification data included in the second header data is reproduced without reproducing the first identification data included in the first header data by the reproduction means, the second A pseudo-header signal output means for outputting at a second timing a second pseudo-header signal indicating that the header area has been pseudo-detected based on the identification data; Recording means for recording data in the data recording area based on one of the first and second pseudo header signals.

According to the present invention, there is provided a header area in which header data is recorded, and a data recording area following the header area and receiving or recording data based on the header data recorded in the header area. In an optical disc apparatus for reproducing various data including the header data from an optical disc, a first reproducing means for reproducing the header data from the optical disc, and the header based on the header data reproduced by the first reproducing means. Header signal output means for outputting a header signal indicating that the area has been detected, and the header area has been pseudo-detected based on predetermined data included in the header data reproduced by the first reproducing means. Pseudo header signal output means for outputting a pseudo header signal indicating at a predetermined timing, The header signal and the data recording area are identified based on the header signal output by the header signal output means and the pseudo header signal output by the pseudo header signal output means, and are recorded in the data recording area. Second reproducing means for reproducing the reproduced data.

According to the present invention, there is provided a header area in which header data is recorded, and a data recording area following the header area and receiving or recording data based on the header data recorded in the header area. In an optical disc device for reproducing various data including the header data from an optical disc, a reproducing unit for reproducing the header data from the optical disc, and detecting the header area based on the header data reproduced by the reproducing unit. A header signal output means for outputting a header signal indicating the header area, and a pseudo-header signal indicating that the header area has been pseudo-detected based on predetermined data included in the header data reproduced by the reproduction means at a predetermined timing. Pseudo-header signal output means for outputting the header signal; The header area and the data recording area are identified based on the header signal output by a stage and the pseudo header signal output by the pseudo header signal output means, and data is recorded in the data recording area. Recording means.

[0015] According to the present invention, the first header data including first identification data indicating the first header data;
A header area in which second header data including data substantially identical to the first header data and including second identification data indicating the second header data is recorded; and Optical disc device for reproducing various data including the header data from an optical disc having a data recording area for recording or reproducing data based on the first and second header data recorded in the header area A first reproducing means for reproducing the first and second header data from the optical disc; and a header area based on the first and second header data reproduced by the first reproducing means. A header signal output means for outputting a header signal indicating that the detection has been performed; When the first identification data is reproduced, a first pseudo header signal indicating that the header area has been detected in a pseudo manner is output at a first timing based on the first identification data, and the first pseudo data is output. When the second identification data included in the second header data is reproduced without reproducing the first identification data included in the first header data by the first reproducing means, Pseudo header signal output means for outputting, at a second timing, a second pseudo header signal indicating that the header area has been detected in a pseudo manner, based on the identification data, and the header output by the header signal output means. And the first signal output by the pseudo header signal output means.
And second reproducing means for identifying the header area and the data recording area based on one of the pseudo header signals of the second pseudo header signal and reproducing the data recorded in the data recording area. It has.

According to the present invention, first header data including first identification data indicating the first header data,
A header area in which second header data including substantially the same data as the first header data and second identification data indicating the second header data is recorded, and the header area Optical disc device for reproducing various data including the header data from an optical disc having a data recording area for receiving or recording data based on the first and second header data recorded in the header area A reproducing means for reproducing the first and second header data from the optical disc; and the first and second reproduced by the reproducing means.
Header signal output means for outputting a header signal indicating that the header area has been detected, based on the header data of
When the reproducing means reproduces the first identification data included in the first header data,
A first pseudo header signal indicating that the header area has been detected in a pseudo manner is output at a first timing based on the identification data, and the reproduction means outputs the first pseudo header signal included in the first header data. When the second identification data included in the second header data is reproduced without reproducing the identification data, it indicates that the header area is detected in a pseudo manner based on the second identification data. Second
Pseudo header signal output means for outputting the pseudo header signal at a second timing, the header signal output by the header signal output means, and the first and second pseudo header signal output means by the pseudo header signal output means. Based on one of the pseudo header signals,
Recording means for identifying the header area and the data recording area and recording data in the data recording area.

According to the present invention, there is provided a first header area (header field HF1) in which first header data is recorded, and an area following the first header area, wherein data is recorded based on the first header data. Or a first data recording area to be reproduced (recording field RE1),
A second header area (header field HF2) that is an area following the first data recording area and in which second header data is recorded, and an area that follows the second header area and is the second header area. From the optical disc having a second data recording area (recording field RE2) for recording or reproducing data based on header data, the first
And an optical disk apparatus for reproducing various data including the second header data, a reproducing means for reproducing the first and second header data from the optical disk, and a reproducing apparatus for reproducing the first header data reproduced by the reproducing means. Based on the predetermined data included, a first pseudo header signal indicating that the first header area has been detected in a pseudo manner, and a second pseudo header signal indicating that the second header area has been detected in a pseudo manner.
And pseudo-header signal output means for outputting the respective pseudo-header signals at predetermined timings.

According to the present invention, there is provided a first header area in which first header data is recorded, and an area subsequent to the first header area, wherein data is recorded or reproduced based on the first header data. 1 data recording area, an area following the first data recording area and a second header area where the second header data is recorded, and an area following the second header area and the second header area. An optical disc device for reproducing various data including the first and second header data from an optical disc having a second data recording area for receiving or recording data based on the header data of the first and second data. A first reproducing unit that reproduces the second header data, and a predetermined data included in the first header data reproduced by the first reproducing unit. Similarly, a first pseudo header signal indicating that the first header area has been detected, and a second pseudo header signal indicating that the second header area has been detected, at predetermined timings. A pseudo-header signal output means for outputting the first pseudo-header signal based on the first pseudo-header signal output by the pseudo-header signal output means.
And a second reproducing unit that reproduces data recorded in the data recording area and reproduces data recorded in the second data recording area based on the second pseudo header signal.

According to the present invention, there is provided a first header area in which first header data is recorded, and an area subsequent to the first header area, wherein data is recorded or reproduced based on the first header data. 1 data recording area, an area following the first data recording area and a second header area where the second header data is recorded, and an area following the second header area and An optical disc device for reproducing various data including the first and second header data from an optical disc having a second data recording area for receiving or recording data based on the header data of the first and second data. (2) reproducing means for reproducing the header data of No. 2 and pseudo data based on predetermined data included in the first header data reproduced by the reproducing means. A first pseudo header signal indicating that the first header area has been detected and a second pseudo header signal indicating that the second header area has been detected in a pseudo manner at predetermined timings, respectively. Output means for recording data in the first data recording area based on the first pseudo header signal output by the pseudo header signal output means, and outputting the second data based on the second pseudo header signal. Recording means for recording data in the data recording area.

According to the present invention, first header data (header 1 field) including first identification data (PID1) indicating the first header data, and substantially the same as the first header data Identification data (PID) indicating that the data is unique data and the second header data.
Second header data including 2) (Header 2 field)
In the first header area (header field HF)
1) a first data recording area (recording field RE1) following the first header area and receiving or recording data based on the first or second header data; Third header data (header 1 field) including third identification data (PID1) indicating an area following the recording area and indicating the third header data, and substantially the third header data. A second header area (header field HF2) in which fourth header data (header 2 field) including fourth identification data indicating the same data and the fourth header data is recorded, and A second data recording area (recording area) following the second header area and receiving or recording data based on the third or fourth header data. In the optical disc apparatus for reproducing various data including the first, second, third, and fourth header data from the optical disc having the recording field RE2), the first, second, third, and second data are reproduced from the optical disc. Reproducing means for reproducing the header data of No. 4; and reproducing the first identification data included in the first header data by the reproducing means, based on the first identification data, A first pseudo header signal indicating that the first header area has been detected is output at a first timing, and a second pseudo header signal indicating that the second header area has been pseudo detected is output as a second pseudo header signal. And the first identification data included in the first header data is not reproduced by the reproducing means.
When the second identification data included in the second header data is reproduced, a third pseudo header indicating that the first header area has been detected in a pseudo manner based on the second identification data. A pseudo-header signal output means for outputting a signal at a third timing and outputting the second pseudo-header signal at the second timing indicating that the second header area has been detected in a pseudo manner. ing.

According to the present invention, the first header data including first identification data indicating the first header data,
A first header area in which second header data including substantially the same data as the first header data and second identification data indicating the second header data is recorded; A first data recording area following the first header area and receiving or recording data based on the first or second header data; an area following the first data recording area and Third header data including third identification data indicating the third header data, and third header data substantially identical to the third header data and indicating the fourth header data. A second header area in which fourth header data including identification data of No. 4 is recorded, and an area subsequent to the second header area, wherein data is recorded or reproduced based on the third or fourth header data. An optical disk device that reproduces various data including the first, second, third, and fourth header data from an optical disk having a second data recording area for receiving the first, second, third, and fourth header data. A first reproducing means for reproducing the third and fourth header data; and a first reproducing means for reproducing the first identification data included in the first header data by the first reproducing means. Based on the identification data, the first
A first pseudo header signal indicating that the header area has been detected is output at the first timing, and a second pseudo header signal indicating that the second header area has been detected is converted to the second pseudo header signal. Output at the same timing, and the first reproduction means includes the first header data included in the first header data.
When the second identification data included in the second header data is reproduced without reproducing the identification data of the first, the pseudo first data is generated based on the second identification data.
A third pseudo-header signal indicating that the header region has been detected is output at a third timing, and the second pseudo-header signal indicating that the second header region has been pseudo-detected is output to the second pseudo-header signal. A first pseudo header signal output means for outputting the pseudo header signal based on one of the first and third pseudo header signals output by the pseudo header signal output means; The data recorded in the data recording area is reproduced, and the second
And a second reproducing means for reproducing data recorded in the second data recording area based on the pseudo header signal.

According to the present invention, the first header data includes first identification data indicating the first header data,
A first header area in which second header data including substantially the same data as the first header data and second identification data indicating the second header data is recorded; A first data recording area following the first header area and receiving or recording data based on the first or second header data; an area following the first data recording area and Third header data including third identification data indicating the third header data, and third header data substantially identical to the third header data and indicating the fourth header data. A second header area in which fourth header data including identification data of No. 4 is recorded, and an area subsequent to the second header area, wherein data is recorded or reproduced based on the third or fourth header data. An optical disk device that reproduces various data including the first, second, third, and fourth header data from an optical disk having a second data recording area for receiving the first, second, third, and fourth header data. A reproducing means for reproducing the third and fourth header data; and when the reproducing means reproduces the first identification data included in the first header data, a pseudo code is generated based on the first identification data. A first pseudo header signal indicating that the first header area has been detected is output at a first timing, and a second pseudo header indicating that the second header area has been detected in a pseudo manner. The second signal
And the reproducing means reproduces the second identification data included in the second header data without reproducing the first identification data included in the first header data. In some cases, based on the second identification data, a third pseudo header signal indicating that the first header area has been detected is output at a third timing, and the second pseudo header signal is output in a pseudo manner. The second pseudo header signal indicating that an area has been detected is transmitted to the second pseudo header signal.
The first data based on one of the first and third pseudo header signals output by the pseudo header signal output means. Data is recorded in a recording area, and based on the second pseudo header signal,
Recording means for recording data in the second data recording area.

According to the present invention, there is provided a first header area in which first header data is recorded, and an area subsequent to the first header area, wherein data is recorded or reproduced based on the first header data. 1 data recording area, an area following the first data recording area and a second header area where the second header data is recorded, and an area following the second header area and An optical disc device for reproducing various data including the first and second header data from an optical disc having a second data recording area for receiving or recording data based on the header data of the first and second data. A first reproducing unit for reproducing the second header data, and detecting the first header area based on the first header data reproduced by the first reproducing unit. Header signal output means for outputting a first header signal indicating that the first header signal has been detected, and outputting a second header signal indicating that the second header area has been detected based on the second header data; A first pseudo header signal indicating that the first header area has been detected in a pseudo manner, based on predetermined data included in the first header data reproduced by the reproducing means, and Pseudo header signal output means for outputting at each predetermined timing a second pseudo header signal indicating that the second header area has been detected, the first header signal output by the header signal output means, and the pseudo header signal output means. The first header area and the first data recording area are identified based on the first pseudo header signal output by the header signal output means, and the first data recording is performed. Reproducing the data recorded in the band, based on the second pseudo header signal output by the pseudo-header signal output means, said second
Identifying the header area and the second data recording area,
Second reproducing means for reproducing data recorded in the second data recording area.

According to the present invention, there is provided a first header area in which first header data is recorded, and an area subsequent to the first header area, wherein data is recorded or reproduced based on the first header data. 1 data recording area, an area following the first data recording area and a second header area where the second header data is recorded, and an area following the second header area and An optical disc device for reproducing various data including the first and second header data from an optical disc having a second data recording area for receiving or recording data based on the header data of the first and second data. Reproducing means for reproducing the second header data, and detecting that the first header area is detected based on the first header data reproduced by the reproducing means. Header signal output means for outputting a first header signal, and outputting a second header signal indicating that the second header area has been detected based on the second header data; A first data indicating that the first header area is detected in a pseudo manner based on predetermined data included in the first header data.
Pseudo-header signal output means for outputting a pseudo-header signal and a second pseudo-header signal indicating that the second header area has been pseudo-detected at a predetermined timing; Identifying the first header area and the first data recording area on the basis of the first header signal and the first pseudo header signal output by the pseudo header signal output means. Data is recorded in the data recording area of, and the second header area and the second data recording area are identified based on the second pseudo header signal output by the pseudo header signal output means, Recording means for recording data in the second data recording area.

According to the present invention, first header data including first identification data indicating the first header data,
A first header area in which second header data including substantially the same data as the first header data and second identification data indicating the second header data is recorded; A first data recording area following the first header area and receiving or recording data based on the first or second header data; an area following the first data recording area and Third header data including third identification data indicating the third header data, and third header data substantially identical to the third header data and indicating the fourth header data. A second header area in which fourth header data including identification data of No. 4 is recorded, and an area subsequent to the second header area, wherein data is recorded or reproduced based on the third or fourth header data. An optical disk device for reproducing various data including the first, second, third, and fourth header data from an optical disk having a second data recording area for receiving the first, second, third, and fourth header data. A third reproducing means for reproducing the third and fourth header data, and detecting that the first header area is detected based on the first or second header data reproduced by the first reproducing means. And outputs a first header signal as shown in FIG.
Or a header signal output means for outputting a second header signal indicating that the second header area has been detected based on fourth header data;
When the first identification data included in the header data is reproduced, a first pseudo header signal indicating that the first header area has been detected in a pseudo manner is generated based on the first identification data. Output at a second timing, and output at a second timing a second pseudo header signal indicating that the second header area has been detected in a pseudo manner;
The first reproducing means does not reproduce the first identification data included in the first header data,
When the second identification data included in the header data is reproduced, based on the second identification data, a third pseudo header signal indicating that the first header region has been detected in a pseudo manner is generated. And pseudo-header signal output means for outputting at the second timing the second pseudo header signal indicating that the second header area has been detected in a pseudo manner, and outputting the header signal. The first header signal output by the first means and the pseudo header signal output from the first and third pseudo header signals output by the pseudo header signal output means. Identifying a header area and the first data recording area, reproducing data recorded in the first data recording area, and, based on the second pseudo header signal, The second header region and the second data recording area and identification, and a second reproducing means for reproducing the data recorded in the second data recording area.

According to the present invention, the first header data including the first identification data indicating the first header data,
A first header area in which second header data including substantially the same data as the first header data and second identification data indicating the second header data is recorded; A first data recording area following the first header area and receiving or recording data based on the first or second header data; an area following the first data recording area and Third header data including third identification data indicating the third header data, and third header data substantially identical to the third header data and indicating the fourth header data. A second header area in which fourth header data including identification data of No. 4 is recorded, and an area subsequent to the second header area, wherein data is recorded or reproduced based on the third or fourth header data. An optical disk device that reproduces various data including the first, second, third, and fourth header data from an optical disk having a second data recording area for receiving the first, second, third, and fourth header data. A reproducing means for reproducing the third and fourth header data, and a first header signal indicating that the first header area is detected based on the first or second header data reproduced by the reproducing means. And a header signal output unit for outputting a second header signal indicating that the second header area is detected based on the third or fourth header data, and the first header by the reproducing unit. When the first identification data included in the data is reproduced, the first identification data indicating that the first header area has been detected in a pseudo manner based on the first identification data. Outputs a header signal at a first timing, pseudo second
A second pseudo header signal indicating that the header area has been detected is output at a second timing, and the reproducing means does not reproduce the first identification data included in the first header data. When the second identification data included in the second header data is reproduced, a third pseudo header signal indicating that the first header area has been detected in a pseudo manner based on the second identification data. At a third timing, and the pseudo header signal output means for outputting at a second timing the second pseudo header signal indicating that the second header area has been detected, and the header Either the first header signal output by the signal output means or the first and third pseudo header signals output by the pseudo header signal output means Based on the pseudo header signal, the first
Identifying the header area and the first data recording area,
Recording data in the first data recording area; identifying the second header area and the second data recording area based on the second pseudo header signal; Recording means for recording data with respect to.

[0027]

Embodiments of the present invention will be described below with reference to the drawings.

First, referring to FIGS. 1 to 9, a DVD (Digital Video Disk) -RAM (rand) as an optical disc will be described.
The outline of om access memory) will be described. FIG. 1 is a diagram for explaining the concept of a zone of an optical disk. FIG. 2 is a diagram for explaining the outline of the data structure of the optical disc. FIG. 3 is a diagram for explaining the rotation speed corresponding to each zone of the optical disc and the number of sectors per track in each zone. FIG. 4 is a diagram for explaining the sector format of the optical disc. 5 and 6
FIG. 4 is a diagram for explaining a header field provided between a groove sector and a land sector or a land sector. 7 and 8 are diagrams for explaining a header field provided between a groove sector and a land sector. FIG. 9 is a perspective view showing the structure of the optical disc.

As shown in FIG. 1 and FIG.
Can be divided into a lead-in area 2, a data area 3, and a lead-out area 4. Each area is
It is composed of a plurality of zones, and each zone is composed of a plurality of tracks.

The lead-in area 2 includes an emboss data zone 5 and a rewritable data zone 6. A reference signal and control data are recorded in the emboss data zone 5 during manufacturing. The rewritable data zone 6 further includes a guard track zone, a disk test zone, a drive test zone, a disk identification data zone, a replacement management zone as a replacement management area, and the like. .

The data area 3 is composed of a plurality of zones, for example, zones 3a,.

The lead-out area 4 is a rewritable data zone similar to the rewritable data zone 6 formed in the lead-in area 2. In the lead-out area 4, data having the same recording content as the data zone 6 is recorded.

The optical disc 1 has a different number of sectors per track between the inner circumference and the outer circumference. That is, the number of sectors included in one track on the outer peripheral side is larger than the number of sectors included in one track on the inner peripheral side.
Therefore, as shown in FIG. 3, the number of rotations (rotational speed) of the optical disc 1 changes for each zone. Therefore, in each zone in the lead-in area 2, each zone in the data area 3, and each zone in the lead-out area 4, the rotation speed decreases from the inner circumference to the outer circumference of the optical disc 1.

The zones 3a,... 3x of the data area 3
As shown in FIG. 1 and FIG. 2, each track has an ECC (error correction code) block data unit (for example, 38688 bytes) as a data recording unit.
The data is recorded.

Next, the sector format will be described with reference to FIG.

As shown in FIG. 4, one sector is approximately 2 sectors.
It consists of 697 bytes. This sector contains 8-
Data modulated by 16 modulation is recorded. 8-1
Six modulation is a modulation method for modulating an 8-bit input code sequence into a 16-bit output code sequence. The input code sequence is called an input bit, and the output code sequence is called a channel bit. Incidentally, one byte has the same meaning as 16 channel bits.

Here, the details of one sector will be described. One sector includes a 128-byte header field (header area), a 2-byte mirror field, and a 2567-byte recording field (data recording area).

In the header field, predetermined data is emboss-recorded (pre-formatted) as an uneven shape in the manufacturing process of the optical disk. In this header field, quadruplicate sector addresses are written in order to improve the detection accuracy of the header. That is, this header field is composed of a header 1 field, a header 2 field, a header 3 field, and a header 4 field. The header 1 field and the header 3 field are composed of 46 bytes. The header 2 field and the header 4 field are composed of 18 bytes.

The header 1 field and the header 3 field are a 36-byte synchronization code VFO (Variable Frequency).
1 field, 3-byte address mark AM (Address Mark) field, 4-byte address PID (Physical ID) 1 field, 2-byte error detection code IED (ID Error Detection Code) 1
Field, 1-byte postamble PA (Post Amb
les) It is composed of one field.

The header 2 field and the header 4 field are an 8-byte synchronization code VFO2 field, a 3-byte address mark AM field, a 4-byte address PID2 field, and a 2-byte error detection code I.
The ED2 field is composed of a 1-byte postamble PA2 field.

PID field (PID1 field,
PID2 field, PID3 field, PID
4 fields), sector information and a sector number are recorded. This PID field will be described later in detail.

VFO field (VFO1 field,
The PLL (Phase Locked Loo) is stored in the VFO2 field.
A continuous repetition pattern (100010001000...) for performing the pull-in of p) is recorded. More specifically, the pattern recorded in the VFO field is for synchronizing the frequency for reproducing the information recorded in the PID field.

In the AM field, an address mark (A
M) is recorded, and this address mark has a role of detecting a block boundary when demodulating a fixed-length block code. Specifically, the address mark recorded in the AM field indicates the position of the address information recorded in the PID field. A special pattern (a pattern violating the run-length restriction) that does not appear elsewhere is used for the address mark recorded in the AM field.

IED field (IED1 field,
An error detection code for the PID field is recorded in the IED2 field, IED3 field, and IED4 field), and the presence or absence of an error in the PID field read by the error detection code is detected.

State information necessary for demodulation is recorded in the PA field, and also has a role of polarity adjustment so that the header field ends with a space.

The mirror field is a mirror surface field, and this field is used for adjusting the gain of a photodetector described later.

The recording field is a field mainly for recording user data. The recording fields are a (10 + J / 16) byte gap field, a (20 + K) byte guard 1 field, a 35 byte VFO3 field, and a 3 byte PS.
(Pre-synchronous code) field, 2418-byte data field (user data field), 1-byte postamble PA3 field, (55-K)
Guard 2 field of bytes, and (25-J / 1
6) Consists of a byte buffer field. Incidentally, J takes an integer of 0 to 15 and K takes an integer of 0 to 7 and takes a random value. As a result, the start position of the data writing is randomly shifted. As a result, deterioration of the recording film due to overwriting can be reduced.

The gap field is a field in which nothing is recorded.

The guard 1 field is a discarded data area for absorbing the deterioration of the starting end of the repeated overwriting peculiar to the phase change recording film.

The VFO3 field is also a field for PLL lock, but is also intended to synchronize a byte boundary by inserting a synchronization code in the same pattern.

The PS field is a field where a synchronization code is recorded, and is provided for detecting a block boundary.

The data field includes a data ID, a data ID error correction code IED (Data ID Error Detection Code).
Code), synchronization code, ECC (Error Collection Code)
), EDC (Error Detection Code), 2048 bytes of user data, and the like.
The data ID is a sector ID 1 to ID 16 of 4 bytes (32 channel bits) of each sector. Data ID
The error correction code IED is a 2-byte (16-bit) error correction code for data ID.

The postamble PA3 field contains state information necessary for demodulation and is a field indicating the end of the last byte of the previous data field.

The guard 2 field is a field provided to prevent the end deterioration at the time of repetitive recording peculiar to the phase change recording medium from reaching the data field.

The buffer field is a field provided for absorbing rotation fluctuation of the motor for rotating the optical disk 1 so that the data field does not overlap the next header field.

Subsequently, the PID fields (PID1, PID2, PID3, PID
ID4 field) will be specifically described. PID
The field is composed of a 1-byte (8-bit) sector information field and a 3-byte (24-bit) sector number field. In the sector number field, address data of the sector is recorded.

Further, this sector information includes a 2-bit reserved field and a 2-bit PID.
It is composed of a number field, a 3-bit sector type field, and a 1-bit layer number field.

Nothing is recorded in the reserved field.

A PID number is recorded in the PID number field. For example, the PID number field in the header 1 field is “00” indicating PID1, the PID number field in the header 2 field is “01” indicating PID2, and the PID number field in the header 3 field is PI.
"10" indicating D3, P in header 4 field
“11” indicating PID4 is recorded in the ID number field.

According to the present invention, a land track and a groove track are identified from the relationship between the sector numbers recorded in the sector number fields in the header 1 field to the header 4 field.

In the sector type field, "00" indicating a read-only sector is set.
0, "001", "010", or "011" indicating a reserved sector (Reserved), a rewritable head sector (Rewrit) of a land or groove track.
"100" indicating that it is an able first sector, and "10" indicating that it is a rewritable last sector of a land or groove track.
1 ", the sector immediately before the rewritable last sector of the land or groove track (Rewritable before last
"110" to indicate that the sector is a rewritable sector or land or groove track.
"111" indicating that it is an itable other sector) is recorded.

“1” or “0” indicating layer 1 or 0 is recorded in the layer number field.

Next, a header field provided between a groove sector and a land sector, a land sector and a land sector, or a groove sector and a land sector will be described with reference to FIGS. 5 to 8 are views showing a part of the information recording area of the optical disc.

FIGS. 5 and 6 show a land sector L01, a groove sector G11, a land sector L21, a groove sector G31, a land sector L41, and a groove sector G5 from the outer circumference to the inner circumference of the optical disk.
1 is provided. Further, the distance between the centers of adjacent tracks is referred to as a track pitch. For example, from the center of the track where the land sector L22 is provided, the groove sector G32
Is the track pitch. Note that N in FIG. 6 indicates one track (1
Per sector), and the value of N is 17 to 40
Is an integer between.

In FIGS. 7 and 8, a groove sector G1n, a land sector L2n, a groove sector G3n, a land sector L4n, and a groove sector G5n are provided from the outer circumference to the inner circumference of the optical disk. The situation is shown. Further, the distance between the centers of adjacent tracks is referred to as a track pitch. For example, the distance from the center of the track provided with the land sector L40 to the center of the track provided with the groove sector G50 is the track pitch. In addition,
N in FIG. 8 indicates the number of sectors per track (one round), and the value of N is an integer between 17 and 40.

First, with reference to FIGS. 5 and 6, a description will be given of a header field provided between a groove sector and a land sector.

The header field 11 is provided with a plurality of pits P as shown in FIG. The centers of the pits constituting the header 1 field H12-1 and the 2 field H12-2 are the land sector L02 and the groove sector G12 (or the land sector L01 and the groove sector G12).
It exists at a position on the same line as the tangent of 11). Header 3 field H22-3 and header 4 field H22-4
Is located on an extension of a tangent line between the groove sector G12 and the land sector L22 (or the groove sector G11 and the land sector L21). Header 1
Field H32-1 and header 2 field H32-
The center of the pits constituting the second sector 2 exists on an extension of a tangent line between the land sector L22 and the groove sector G32 (or the land sector L21 and the groove sector G31). Header 3 field H42-3 and header 4 field H42
The center of the pits constituting -4 is the groove sector G32
And the land sector L42 (or the groove sector G31 and the land sector L41). Header 1 field H52-1 and header 2 field H5
The center of the pit constituting 2-2 is the land sector L42.
And the groove sector G52 (or the land sector L41 and the groove sector G51). Header 3 field H62-3 and header 4 field H
The center of the pit constituting 62-4 is located in the groove sector G.
52 and land sector L62 (or groove sector G51).
And the land sector L61).

The sector number of each header in the header field 11 provided between the groove sectors has a relationship as shown in FIG. For example,
A description will be given taking a sector number of a header field provided between the groove sector G11 and the groove sector G12 as an example. Groove sector G11 and groove sector G1
2, header 1 field H12-1, header 2
Field H12-2, header 3 field H22-
3 and a header 4 field H22-4. The sector number of the header 1 field H12-1 is (n + 3N), the sector number of the header 2 field H12-2 is (n + 3N), and the header 3 field H
The sector number of 22-3 is (n + 2N), and the sector number of header 4 field H22-4 is (n + 2N). In other words, comparing the sector numbers of each header provided between the groove sector and the groove sector,
The relationship of (sector number of header 1 field or header 2 field)> (sector number of header 3 field or header 4 field) is established.

On the other hand, the sector number of each header of the header field 11 provided between land sectors has a relationship as shown in FIG. For example, a description will be given taking a sector number of each header provided between the land sector L21 and the land sector L22 as an example. Header 1 is located between land sector L21 and land sector L22.
Field H32-1, header 2 field H32-
2, a header 3 field H22-3 and a header 4 field H22-4. The sector number of the header 1 field H32-1 is (n + N), and the sector number of the header 2 field H32-2 is (n + N).
N), the sector number of the header 3 field H22-3 is (n + 2N), and the sector number of the header 4 field H22-4 is (n + 2N). That is, when the sector numbers of the headers provided between the land sector and the land sector are compared, the relationship of (sector number of header 1 field or header 2 field) <(sector number of header 3 field or header 4 field) is found. To establish.

That is, by reproducing the header, (sector number of header 1 field or header 2 field)>
If the relationship of (sector number of header 3 field or header 4 field) is found, the sector (track) after this header is a groove sector (groove track).
And a reproduction process corresponding to a groove sector can be performed. Conversely, by header playback,
If the relationship of (sector number of header 1 field or header 2 field) <(sector number of header 3 field or header 4 field) is found, the sector (track) after this header is a land sector (land track). Thus, the reproduction process corresponding to the land sector can be performed.

Next, with reference to FIGS. 7 and 8, a description will be given of the header field provided between the groove sector and the land sector, that is, at the transition between the groove and the land.

In the header field 11, a plurality of pits P are provided as shown in FIG. The centers of the pits constituting the header 3 field H20-3 and the header 4 field H20-4 are located on an extension of a tangent between the groove sector G10 and the land sector L20. Header 1
Field H30-1 and header 2 field H30-
The center of the pit constituting the second sector 2 exists on an extension of a tangent line between the land sector L20 and the groove sector G30 (or the groove sector G1n and the land sector L2n). Header 3 field H40-3 and header 4 field H40
The center of the pits constituting -4 is the groove sector G30.
And the land sector L40 (or the land sector L2n and the groove sector G3n). Header 1 field H50-1 and header 2 field H5
The center of the pit constituting 0-2 is located at the land sector L40.
And the groove sector G50 (or the groove sector G3n and the land sector L4n). Header 3 field H60-3 and header 4 field H
The center of the pit constituting 60-4 is the groove sector G
50 and the land sector L60 (or the land sector L4n and the groove sector G5n).
The center of the pits constituting the header 1 field H70-1 and the header 2 field H70-2 is the land sector L
It exists on an extension of the tangent line between the groove sector 60 and the groove sector G70.

The sector number of each header of the header field 11 provided between the land sector and the groove sector (when changing from the land sector to the groove sector) has a relationship as shown in FIG. For example, a description will be given taking a sector number of each header provided between the land sector L2n and the groove sector G30 as an example. Between the land sector L2n and the groove sector G30, a header 1 field H30-1, a header 2 field H30
-2, a header 3 field H40-3, and a header 4 field H40-4. Also, header 1
The sector number of the field H30-1 is (m + 3
N), the sector number of the header 2 field H30-2 is (m + 3N), the sector number of the header 3 field H40-3 is (m + 2N), and the header 4 field H40.
The sector number of -4 is (m + 2N). That is,
Comparing the sector number of each header provided between the land sector and the groove sector, the relationship of (sector number of header 1 field or header 2 field)> (sector number of header 3 field or header 4 field) is established. .

On the other hand, the sector number of each header of the header field 11 provided between the groove sector and the land sector (when changing from the groove sector to the land sector) has a relationship as shown in FIG. For example, a description will be given taking a sector number of each header provided between the groove sector G3n and the land sector L40 as an example. A header 1 field H50-1 and a header 2 field H50 are provided between the groove sector G3n and the land sector L40.
-2, a header 3 field H40-3, and a header 4 field H40-4. Also, header 1
The sector number of the field H50-1 is (m + N),
The sector number of the header 2 field H50-2 is (m
+ N), the sector number of the header 3 field H40-3 is (m + 2N), and the sector number of the header 4 field H40-4 is (m + 2N). That is, when the sector numbers of the headers provided between the groove sector and the land sector are compared, the relationship of (sector number of header 1 field or header 2 field) <(sector number of header 3 field or header 4 field) is satisfied. To establish.

That is, by reproducing the header, (sector number of header 1 field or header 2 field)>
If the relationship of (sector number of header 3 field or header 4 field) is found, the sector (track) after this header is a groove sector (groove track).
And a reproduction process corresponding to a groove sector can be performed. Conversely, by header playback,
If the relationship of (sector number of header 1 field or header 2 field) <(sector number of header 3 field or header 4 field) is found, the sector (track) after this header is a land sector (land track). Thus, the reproduction process corresponding to the land sector can be performed.

As described above with reference to FIG. 5 to FIG. 8, the size of the header 1 field (or header 2 field) and the header 3 field (or header 4 field) obtained by header reproduction indicate the size of the subsequent sector (or header 4 field). It is possible to identify whether the (track) is a land sector (land track) or a groove sector (groove track).

Further, the positional relationship of the header field with respect to the groove sector (groove track) and the land sector (land track) will be described.

The groove track and the land track are 1
A system that switches every lap is called a single spiral system. As described above, by recording the header field between the land track and the groove track in the optical disk employing the single spiral system, cutting by one beam can be realized. A sector located at the switching between the groove track and the land track is called a first sector.
FIGS. 7 and 8 described above show the header field of the first sector. In FIGS. 5 to 8, when the track is spirally tracked, the tracking polarity changes to land, groove, land, groove,.
It switches to.

As described above, in the single spiral system in which the groove and the land are switched at every turn, it is necessary to switch the polarity between the groove track and the land track during tracking. Therefore, the sector where the groove track is switched to the land track or the sector where the land track is switched to the groove track has a different header arrangement from other sectors.

Here, a method of manufacturing an optical disk will be briefly described. First, a glass disk is produced. A photoresist (photosensitive resin) is applied to the glass disk to produce a photoresist disk. The photoresist disk is rotated, and the rotating photoresist disk is irradiated with laser light, and tracks and headers are exposed and recorded on the photoresist disk. When a photoresist disc on which tracks and headers are exposed and recorded is developed, the exposed portions of the photoresist dissolve in the developing solution, and tracks and headers are formed on the photoresist disc.

The process of forming tracks and headers on the photoresist disk in this manner is called a cutting process, and this cutting process is realized by a cutting device. That is, the cutting apparatus is provided with an optical head for irradiating the photoresist disk with laser light. Further, metal is deposited on the photoresist disc on which the tracks and the header are formed, and a master disc is manufactured. The master is plated with Ni, and the Ni plating layer is peeled from the master.
The peeled Ni plating layer becomes a mold of an optical disk called a stamper. Then, an optical disk is manufactured using the stamper as a mold.

In the cutting process described above,
The optical head of the cutting device is
The movement at a constant speed from the inner circumference to the outer circumference is performed by the track pitch. A portion irradiated with the laser beam becomes a groove, and a portion not irradiated becomes a land.

FIG. 8 shows sector numbers m, (m + N),
A first sector of (m + 2N) for three tracks is shown. In the cutting process, after the land sector L4n, the land sector L4n is shifted outward by a half track pitch from the center of the track, and the header 1 field H50-1 and the header 2 field H
50-2 is recorded. Further, the header 1 field H50-3 and the header 2 field H50-4 are recorded shifted inward from the center of the track of the land sector L4n by a half track pitch.

The mirror section is generated by not irradiating the laser beam. The groove portion is generated by irradiating a laser beam. At this time, the groove is formed in a wave shape by sine-wave oscillating the laser beam spot from the inner circumference to the outer circumference at a period of 186 channel bits. This signal component can be used as a reference signal for clock generation during data writing. Sector number m
The recording from one turn to the sector number (m + N-1) is performed according to the procedure described above. One round from the sector number (m + N) to the sector number (m + 2N-1) is not irradiated with laser light. By repeating this operation, a header field as shown in FIG. 8 is formed.

FIGS. 5 and 6 show header structures other than the first sector. By the cutting process as described above, the header 1 field and the header 2 field which are the first half header and the header 3 field and the header 4 field which are the second half header of the groove sector are recorded. Note that the first half header and the second half header of the land sector are recorded with a difference of one turn.

Next, the structure of the optical disk will be described with reference to FIG.

The substrate 200 of the optical disk is made of a transparent material such as plastic, and is copied by a mold called a stamper. A header field and a recording field are recorded on the substrate 200. Header information is recorded in the header field by emboss pits P. A groove track GT and a land track LT are formed in the recording field.

Further, as viewed from the side of incidence of the reproduction laser beam, the emboss pit P has a convex shape, the groove track GT has a convex shape, and the land track LT has a concave shape. Substrate 1
A protective film 201, a recording film 202, a protective film 203, and a reflective film 204 are sequentially formed on the uneven recording surface 00 from the substrate 200 side. The chain line in the figure indicates the groove track GT.
Alternatively, it indicates the center of the land track LT. The emboss pits P constituting the header field are located at Wt / 2 from the center lines of the groove track GT and the land track LT.
Located on the line shifted only by. Here, Wt indicates a track pitch, and is a distance between the center of the groove track GT and the center of the land track LT.

The emboss pit P is formed in the groove track G
When the T is cut, the laser spot is wobbled by Wt / 2 to generate a staggered shape.

As shown in FIGS. 6 and 8, since the staggered emboss pits P are provided in the header field, it is not necessary to make the width of the groove track GT different from the diameter of the emboss pits P. That is, the groove track GT and the emboss pit P can be cut by the same beam. Therefore, the cutting device can be greatly simplified.

Next, the cutting apparatus will be described with reference to FIGS. FIG. 10 is a diagram showing a schematic configuration of a cutting device. FIG. 11 is a diagram for explaining the cutting modulation signal and the wobble control signal generated by the format circuit of the cutting device.
FIG. 12 is a diagram for explaining a cutting modulation signal for forming a single spiral.

First, the schematic configuration of the cutting device will be described with reference to FIG. Laser light (Ar laser or Kr laser) emitted from the laser light source 141
Is incident on a laser optical axis control system 142 for adjusting the optical axis. In the laser optical axis control system 142, the optical axis of the laser light is adjusted. The laser light passing through the laser optical axis control system 142 is reflected by a mirror 143 and is output from the format circuit 14.
The beam enters the beam modulation system 144 controlled at 9.

The beam modulation system 144 includes an acousto-optic modulator (AOM) 144a and an acousto-optic modulator (AOM). The acousto-optic modulator 144a modulates the laser light according to the cutting modulation signal supplied from the format circuit 149. The acousto-optic deflector 144b
The laser beam is deflected according to an instruction supplied from the format circuit 149. The format circuit 149 is a ROM
And a wobble control signal indicating a wobble amount and a wobble direction. The ROM 150 will be described later in detail.

The laser light incident on the beam modulation system 144 is modulated by the acousto-optic modulator 144a and deflected by the acousto-optic deflector 144b. This beam modulation system 1
The laser light passing through 44 enters a beam shaping system 145 including a pinhole and a slit. Beam shaping system 14
In 5, the beam diameter and shape of the laser beam are adjusted. The laser light having passed through the beam shaping system 145 is incident on the beam monitor system 146. The beam monitor system 146 monitors the beam shape of the laser light.

The laser beam passing through the beam monitor system 146 is guided by the mirror-147, and is focused and irradiated on the photoresist board 140 by the objective lens 148. The photoresist disc 140 is a glass disc coated with a photoresist. The portion of the photoresist disc irradiated with the laser beam has a concave shape due to the etching.

At the time of cutting, the photoresist disc 140 is rotated at a constant speed by the spindle motor 139. Further, the photoresist disc 140 is moved in a predetermined direction by the feed screw 151 while being integrated with the spindle motor 139. This movement causes the objective lens 1
The laser light irradiated through 48 is moved from the inner peripheral side to the outer peripheral side of the photoresist disc 140. Incidentally, the feed screw 151 is controlled by the feed control device 152 so that the photoresist disk 14 integrated with the spindle motor 139 is integrated.
Move 0. Under the control of the feed control device 152, the laser beam is moved from the inner peripheral side to the outer peripheral side by a track pitch for one rotation of the photoresist disc 140. The portion irradiated with the laser beam thus moved is a group track, and the portion not irradiated is a land track. Further, the embossed pits constituting the header field are formed by blinking the laser light.

Here, the ROM 150 provided in the format circuit 149 will be described. The ROM 150 stores a conversion table for implementing the 8-16 modulation. This conversion table modulates an 8-bit input code sequence (hereinafter, referred to as source data) into a 16-bit output code sequence (hereinafter, referred to as a conversion code).
That is, a cutting modulation signal is generated based on the conversion code converted by the conversion table.

Next, the cutting modulation signal and the wobble control signal generated by the format circuit 149 will be described with reference to FIG.

The cutting modulation signal is a signal used as a modulation signal of the laser light source 141 of the cutting device. In FIG. 11, it is assumed that the level of the cutting modulation signal is proportional to the output of the laser beam.

The wobble control signal is a signal for controlling the deflection angle in the acousto-optic deflector 144b for shifting the beam position. If the wobble control signal is larger than the zero level, the irradiation position of the beam moves upward with respect to the center position of the track. If the wobble control signal is smaller than the zero level, the beam irradiation position moves downward with respect to the center position of the track.

As shown in FIG. 11, the portion where the wobble control signal has a value larger than the zero level, that is, the header 1 and the header 2 are shifted upward from the center position of the track. On the other hand, the portion of the wobble control signal having a value smaller than the zero level, that is, the portions of the header 3 and the header 4 are shifted downward from the center position of the track. In the part where the wobble control signal is at the zero level, that is, in the groove part, a groove is formed at the center position of the track.

When the cutting modulation signal is at a high level, a concave shape is formed on the master. Therefore, when the cutting modulation signal is at a high level, an emboss pit is formed.

Next, a cutting modulation signal for forming a single spiral will be described with reference to FIG.

The cutting modulation signals a to d are all signals corresponding to one round of the track.

A land track LT forming the track a is formed corresponding to the low (LOW) level cutting modulation signal a. A groove track GT forming the track a is formed corresponding to the cutting modulation signal a at a high level.

A land track LT forming the track b is formed corresponding to the low (LOW) level cutting modulation signal b. A groove track GT forming the track b is formed corresponding to the cutting modulation signal b at a high (HIGH) level.

A land track LT constituting the track c is formed corresponding to the low (LOW) level cutting modulation signal c. A groove track GT forming the track c is formed corresponding to the cutting modulation signal c at a high (HIGH) level.

A land track LT constituting the track d is formed corresponding to the low (LOW) level cutting modulation signal d. A groove track GT forming the track d is formed corresponding to the cutting modulation signal d at a high level.

By switching the cutting modulation signal between the cutting modulation signal a, the cutting modulation signal b, the cutting modulation signal c, and the cutting modulation signal d each time the photoresist disk makes one rotation, a single spiral structure is realized.

Next, an optical disc device according to an embodiment of the present invention will be described with reference to FIGS. FIG. 13 is a diagram showing a schematic configuration of the optical disk device. FIG. 14 is a diagram showing a schematic configuration of a data reproducing circuit of the optical disk device.

First, the schematic configuration of the optical disk device will be described with reference to FIG.

The optical disk device irradiates the optical disk 1 with a converging light beam, receives reflected light of the light beam from the optical disk 1, and records the reflected light on the optical disk 1 reflected on the received reflected light. The reproduced data is reproduced. The optical disk device irradiates the optical disk 1 with a light beam and records data on the light beam 1.

As shown in FIG. 13, the optical disk 1 is loaded on the spindle motor 23 while being held by the cartridge 21. The optical disc 1 is rotated by the spindle motor 23, for example, at a different rotation speed for each zone. This spindle motor 23
Are controlled by the motor control circuit 24.

The reproduction of the data recorded on the optical disk 1 is performed by the optical head 25. The spindle motor 23 and the optical head 25 are provided on a fixed base as described later.

The optical head 25 includes a linear motor 26
Is fixed to a drive coil 27 which constitutes a movable portion of the motor, and the drive coil 27 is connected to a linear motor control circuit 28.

On the other hand, a speed detector 29 is connected to a linear motor control circuit 28 for driving the linear motor 26. The speed signal of the optical head 25 detected by the speed detector 29 is transmitted to the linear motor control circuit 28. And the moving speed of the optical head 25 is controlled.

The objective lens 30 is provided on the carriage 70 of the optical head 25, and is supported by a wire or a leaf spring (not shown). This objective lens 3
0 is moved in the focusing direction (the direction of the optical axis of the lens) by the drive coil 31 and the drive coil 3
2 moves in the tracking direction (the direction orthogonal to the optical axis of the lens).

A semiconductor laser 39 as an irradiating means for irradiating a light beam is driven by a laser driving circuit 35 to generate a laser beam. Laser drive circuit 35
Is a photodiode P for monitoring the semiconductor laser 39.
The light amount of the laser beam generated by the semiconductor laser 39 is corrected according to the monitor current from D.

The laser drive circuit 35 includes a PLL (not shown).
It operates in synchronization with a clock signal for data recording or data reproduction from a circuit. This PLL circuit divides the frequency of a basic clock signal from an oscillator (not shown) to generate a clock signal for data recording or data reproduction. In the laser drive circuit 35, the semiconductor laser 3
When a laser beam for data recording is generated from step 9, control is performed so as to generate a high-output laser beam higher than the laser beam for data reproduction by a predetermined level.

The laser beam generated by the semiconductor laser 39 driven by the laser drive circuit 35 is collimated by a collimator lens 40, and the optical path is bent by a half prism 41 at a substantially right angle.
That is, the semiconductor laser 39 is formed by the half prism 41.
Is emitted toward the optical disc 1 in a collimated state. This laser beam is focused on the data recording surface of the optical disc 1 by the objective lens 30.

The light beam reflected from the data recording surface of the optical disc 1 passes through the objective lens 30 and the half prism 41, passes through the condenser lens 42 and the cylindrical lens 43, and detects light as detection means. Vessel 4
It is led to 4.

The photodetector 44 is composed of, for example, four divided photodetection cells 44a, 44b, 44c and 44d.

The light detection cell 4 included in the light detector 44
The output signal of 4a is supplied to an adder 46a via an amplifier 45a.
The output signal of the photodetection cell 44b is supplied to one end of an adder 46b via an amplifier 45b.
The output signal of the light detection cell 44c is supplied to the other end of the adder 46a via the amplifier 45c.
The output signal of d is supplied to the other end of the adder 46b via the amplifier 45d.

The output signal of the photodetector cell 44a included in the photodetector 44 is supplied to one end of an adder 46c via an amplifier 45a, and the output signal of the photodetector cell 44b is supplied via an amplifier 45b. It is supplied to one end of the adder 46d. The output signal of the light detection cell 44c is
The output signal of the photodetector cell 44d is supplied to the other end of the adder 46d via the amplifier 45d via the amplifier 45d.
6c is supplied to the other end.

The output signal of the adder 46a is a differential amplifier O
The output signal of the adder 46b is supplied to a non-inverting input terminal of the differential amplifier OP2. Thus, the differential amplifier OP2 includes the adder 46a,
A signal relating to the focus point, that is, a focus error signal is supplied to the focusing control circuit 47 in accordance with the difference 46b. The output signal from the focusing control circuit 47 is supplied to the drive coil 31, and is controlled so that the laser beam is always just focused on the data recording surface of the optical disc 1.

An output signal of the adder 46c is a differential amplifier O
The output signal of the adder 46d is supplied to the non-inverting input terminal of the differential amplifier OP1. As a result, the differential amplifier OP1 includes the adder 46c,
A tracking error signal is supplied to the tracking control circuit 48 according to the difference of 46d. Tracking control circuit 48
Creates a track drive signal according to the tracking error signal supplied from the differential amplifier OP1.

The track drive signal output from the tracking control circuit 48 is supplied to the drive coil 32 in the tracking direction. The tracking error signal used in the tracking control circuit 48 is also supplied to the linear motor control circuit 28.

The sum signal of the outputs of the light detection cells 44a to 44d of the light detector 44 in the state where the focusing control and the tracking control are performed, that is, the adder 4
The signal obtained by adding the output signals from 6c and 46d by the adder 46e reflects a pit formed on the track, that is, a change in reflectance from the recording data. This signal is supplied to a data reproducing circuit 38 as reproducing means.
In the data reproducing circuit 38, data recorded on the data recording surface of the optical disk is reproduced.

The reproduction data reproduced by the data reproduction circuit 38 is subjected to error correction by an error correction circuit 52 as an error correction means using an error correction code ECC added to the reproduction data, and then an interface circuit 55 Optical disk control device 56 as an external device through
Is output to

A data generation circuit 34 is provided at a stage preceding the laser drive circuit 35. The data generation circuit 34 receives the format data of the ECC block as the recording data supplied from the error correction circuit 52,
Recording EC with synchronization code for ECC block
An ECC block data generation circuit 34a for converting the data into C block format data, and a modulation circuit 34b for modulating the recording data from the ECC block data generation circuit 34a by the 8-16 modulation method are provided.

The data generation circuit 34 is supplied with the recording data to which the error correction code is added by the error correction circuit 52 and the dummy data for error check read from the memory 10. To the error correction circuit 52, recording data from an optical disk control device 56 as an external device is supplied via an interface circuit 55 and a bus 49.

The error correction circuit 52 converts the 32 Kbytes of recording data supplied from the optical disk control device 56 into 4K bytes.
The horizontal and vertical error correction codes are added to the recording data in the unit of sector for each byte, the sector ID (logical address number) is added, and the ECC is added.
Generate block format data.

The optical disk device has a focusing control circuit 47 and a tracking control circuit 4 respectively.
8, and a D / A converter 51 used to exchange information between the linear motor control circuit 28 and the CPU 50 that controls the entire optical disk device.

Motor control circuit 24, linear motor control circuit 28, laser drive circuit 35, data reproduction circuit 38, focusing control circuit 47, tracking control circuit 4
8. The error correction circuit 53 and the like are connected to the CPU via the bus 49.
50. The CPU 50 has a memory 1
A predetermined operation is performed by the control program recorded in “0”.

The memory 10 stores a control program and is used for data recording. This memory 10
Is a table 10 in which the relationship between speed data (number of revolutions) and the number of sectors in one track is recorded for each zone.
a.

Next, the schematic configuration of the data reproducing circuit 38 will be described with reference to FIG.

The signal supplied to the data reproducing circuit 38 (the signal output from the adder 46e) is
And supplied to the header detection circuit 120. PLL circuit 1
00 extracts data and this clock from this signal. The data and clock extracted by the PLL circuit 100 are supplied to the AM detection circuit 102. The AM detection circuit 102 is supplied with a logical sum signal or a pseudo header signal output from the selection unit SEL4. The logical sum signal and the pseudo header signal output from the selector SEL4 will be described later in detail. AM detection circuit 10
2 detects the address mark (AM) from the data supplied from the PLL circuit 100 by receiving the supply of the logical sum signal or the pseudo header signal. AM detection circuit 10
2 detects an address mark, the timing control unit 104 generates a timing control signal based on the detection of the address mark.

On the other hand, the data extracted by PLL circuit 100 is also supplied to S / P conversion section 106. S / P
The conversion unit 106 converts serial data supplied from the PLL circuit 100 into parallel data. The parallel data converted by the S / P converter 106 is supplied to the 8/16 demodulator 108. The 8/16 demodulation unit 108 performs S / P
8 for the parallel data supplied from the conversion unit 106
/ 16 demodulation processing is performed. Thereby, the 8/16 demodulation unit 1
08 to 8 bits of demodulated data are output.

As shown in FIG. 4, the 4-byte data after the address mark recorded in the AM field is a PID.
Data. Further, two bytes after the PID data are IED data. Therefore, the timing generator 1
The reproduction of the PID data and the IED data is realized by the timing control signal generated by the control unit 04, that is, the timing reference signal generated based on the detection of the address mark.

Here, the control of the register by the register control section 110 will be described. I in the IED1 field
If it is determined from the ED data that there is no error in the PID1 data in the PID1 field, the PID number included in the PID1 field is referred to. As described above, “00” is recorded as the PID number in the PID1 field. In the PID2 field, "01" is recorded as a PID number.
In the PID3 field, “1” is set as the PID number.
0 ”is recorded in the PID4 field.
“11” is recorded as the D number. That is,
By referring to the PID number, PID1 data, PID2 data, PID3 data, and PID4 data are distinguished. When “00” is confirmed as the PID number, the register control unit 110
The PID1 data of the PID field including the number (PID1 field) is written to the register REG1. Conversely, if "00" is not confirmed as the PID number, no data is written to the register REG1.

Similarly, PID2 data in the PID2 field is written into register REG2 by register control section 110. PID3 of PID3 field
Data is written to register REG3. The PID4 data in the PID4 field is written to the register REG4.

The priority adding section 112 determines which of PID1 data and PID2 data has priority,
It is determined which of the data and the PID4 data has priority. That is, the priority order adding unit 112 functions as a priority selecting unit. In this embodiment, PID2 data and PID4 data are given priority. 5 to 9
As shown in the figure, the PID3 field and the PID4 field are formed in a staggered manner with respect to the PID1 field and the PID2 field. The PID1, PID2, PID3, and PID4 fields are formed on an extension of the boundary between the land track and the groove track. Therefore, P
The PID2 data in the ID2 field is reproduced relatively more stably than the PID1 data in the PID1 field.
The PID4 data in the PID4 field is the PID4
Reproduced relatively stably from PID3 data of three fields. That is, by giving priority to the PID2 data and the PID4 data, the reliability of the data in the PID field can be improved.

Of course, PID1 data and PID3 data may be given priority, PID1 data and PID4 data may be given priority, and PID2 data and PID3 data may be given priority.

The priority adding section 112 outputs a PID2 selection signal indicating selection of PID2 data to the selection section SEL1. Further, the priority adding unit 112 selects the selecting unit S
PID4 indicating selection of PID4 data for EL2
Output the selection signal.

When PID1 data is written in register REG1, selector SEL1 stores register REG1.
1 supplies PID1 data. Similarly, when PID2 data is written in the register REG2, PID2 data is supplied from the register REG2 to the selector SEL1. Further, the selection unit SEL1 includes a PI
A D2 selection signal is supplied. PID1 in the selector SEL1
If the data and the PID2 data are prepared, the selector SEL1 selects the PID2 data according to the PID2 selection signal. When only the PID1 data is prepared in the selection unit SEL1, this selection unit SEL1
Select ID1 data. That is, the selection unit SEL1
Functions as priority selection means. The PID1 data or PID2 data selected by the selection unit SEL1 is
4 and the ID calculation unit 116.

On the other hand, when PID3 data is written in register REG3, PID3 data is supplied to register SEL2 from register REG3. Similarly, when PID4 data is written to the register REG4, the selector SEL2 stores the PID4 data from the register REG4.
Four data are supplied. Further, a PID4 selection signal is supplied to the selector SEL2. If PID3 data and PID4 data are prepared in the selector SEL2, the selector SEL2 responds to the PID4 selection signal and
Select D4 data. It should be noted that the selection unit SEL2 has
When only three data are prepared, the selection unit S
EL2 selects PID3 data. That is, the selection unit S
EL2 functions as priority selection means. Selector SEL
The PID3 data or PID4 data selected in 2 is
It is supplied to the comparison unit 114 and the calculation unit 116.

[0147] The comparing section 114 is provided with a sector number included in the PID data (PID1 data or PID2 data) supplied from the selecting section SEL1, and a PID data (PID3 data or PID4 data) supplied from the selecting section SEL2.
Data) is compared with the sector number included in the data. That is, the land track and the groove track are identified by comparing the magnitude relationship between the sector number included in the PID data supplied from the selection unit SEL1 and the sector number included in the PID data supplied from the selection unit SEL2. That is, the comparing unit 114 functions as an identification unit. Then, the comparison unit 114 supplies the identification result (land / groove) to the calculation unit 116.

(Sector number included in PID data supplied from selection unit SEL1)> (sector number included in PID data supplied from selection unit SEL2)
In the case of, the track following these PID data is identified as a groove track. Conversely, (selection section SEL
In the case of (sector number included in PID data supplied from 1) <(sector number included in PID data supplied from selection unit SEL2), tracks following these PID data are identified as land tracks.

The calculating section 116 calculates a sector number based on the comparison result (land / groove) supplied from the comparing section 114. Comparing unit 11 with respect to calculating unit 116
When the comparison result (land) is supplied from No. 4, the calculation unit 116 outputs the sector number included in the PID data supplied from the selection unit SEL1. That is, when a land track is identified, a sector number included in PID1 data or PID2 data is output. When a comparison result (groove) is supplied from the comparison unit 114 to the calculation unit 116, the calculation unit 11
6 outputs a sector number included in the PID data supplied from the selection unit SEL2. That is, when the track is identified as a groove track, the sector number included in the PID3 data or PID4 data is output.

Here, regarding the calculation of the sector number,
A supplementary explanation is given with reference to FIG.

A header 1 field H12-1 or a header 2 field H12-2 and a header 3 field H22
-3 or the header 4 field H22-4. The magnitude relationship in this case is (sector number of header 1 field H12-1 or header 2 field H12-2)> (sector number of header 3 field H22-3 or header 4 field H22-4).
Therefore, the groove sector G12 is identified as a groove sector (groove track). Further, at this time, the sector number of the groove sector G12 is:
The sector number is included in the header 3 field H22-3 or the header 4 field H22-4.

As another example, header 1 field H32-
It is assumed that 1 or header 2 field H32-2 is compared with header 3 field H22-3 or header 4 field H22-4. The magnitude relation in this case is (Header 1 field H32-1 or Header 2 field H32
-2 sector number) <(Header 3 field H22)
-3 or the sector number of the header 4 field H22-4). Therefore, the land sector L22 is identified as a land sector (land track). Further, at this time, the sector number of the land sector L22 is the sector number included in the header 1 field H32-1 or the header 4 field H32-2.

According to the data reproducing circuit 38 shown in FIG. 14, it is possible to identify whether the target track is a land track or a groove track from the header data included in the header field. That is, the sector number included in the PID1 field or the PID2 field and the PID
By comparing with the sector number included in the ID3 field or the PID4 field, it is possible to identify whether the target track is a land track or a groove track from the comparison result. This land / groove identification processing
Reliable PI with error checked by IED data
An identification process is performed based on the D data. Therefore, highly reliable identification processing is realized.

Further, the data reproducing circuit 38 shown in FIG.
The PID1 data and P
It is determined which of the ID2 data has priority and which of the PID3 data and PID4 data has priority.
At this time, by giving priority to PID2 and PID4, more reliable identification processing can be realized.

Next, the details of the header detection will be described.

The register control section 110 selects the selection signal 00, the selection signal 01, the selection signal 10,
Alternatively, the selection signal 11 is output. That is, when the PID1 data is confirmed, the selection signal 00 is output. P
When the ID2 data is confirmed, the selection signal 01 is output. When the PID3 data is confirmed, the selection signal 10 is output. When the PID4 data is confirmed, the selection signal 11 is output.

The selection signal 00, selection signal 01, selection signal 10, or selection signal 11 output from the register control unit 110 is input to the selection unit SEL3. In addition, the selection unit SEL3 includes data 1 stored in the memory 122,
Data 2, data 3, and data 4 are input. Data 1 is data used for generating a pseudo header signal output at the timing when PID1 data is confirmed. Data 2 is data used for generating a pseudo header signal output at the timing when the PID2 data is confirmed. Data 3 is data used for generating a pseudo header signal output at the timing when the PID3 data is confirmed. The data 4 is data to be used for generating a pseudo header signal output at the timing when the PID4 data is confirmed.

When selection signal 00 is input to selection section SEL3, this selection section SEL3 selects and outputs data 1. When the selection signal 01 is input to the selection unit SEL3, the selection unit SEL3 selects and outputs the data 2. When the selection signal 10 is input to the selection unit SEL3, the selection unit SEL3 selects and outputs the data 3. When the selection signal 11 is input to the selection unit SEL3, the selection unit SEL3 selects and outputs the data 4.

Data 1 output from selection unit SEL3,
The data 2, data 3, or data 4 is input to the pseudo header generating unit 124 as pseudo header signal output means. Further, the pseudo header generating unit 124 is provided with a counter 126. The counter 126 stores data 1, data 2,
Data 3 or data 4 is loaded. The counter 126 outputs a count value Nrs and a count value Ns at a predetermined timing according to the loaded data.

The pseudo-header signal generator 124 continues to output the pseudo-header signal from when the data is loaded into the counter 126 until the counter 126 outputs the count value Nrs. Further, the pseudo header signal generation unit 124 continues to output the pseudo header signal from when the counter 126 outputs the count value Ns to when the count value Nrs is output. The pseudo header signal output from the pseudo header signal generation unit 124 is input to the selection unit SEL4 and the OR circuit 128. Further, the pseudo header signal generation unit 124 outputs the selection signal 0 or the selection signal 1 based on the count value Ns output from the counter 126. More specifically, the pseudo-header signal generator 124 outputs the selection signal 1 from the time when the counter 126 outputs the count value Ns until the time when the count value Nrs is output. Otherwise, it outputs the selection signal 0.

On the other hand, the header detection circuit 120 as a header signal output means outputs a header signal indicating that a header field has been detected. The reflected light of the light beam applied to the header field has a certain characteristic due to the influence of the header data arranged in a staggered manner in the header field. The header detection circuit 128 detects this feature and outputs a header signal. Header detection circuit 120
Is output to the OR circuit 128. That is, the header signal output from the header detection circuit 120 and the pseudo header signal output from the pseudo header signal generation unit 126 are input to the OR circuit 128. Therefore, the OR circuit 128 outputs an OR signal of the header signal and the pseudo header signal.

The selector SEL4 includes a logical sum signal output from the logical sum circuit 128 and a pseudo header signal generator 124.
And the selection signal 1 or the selection signal 2 output from the pseudo-header signal generation unit 124. When the selection signal 0 is input to the selection unit SEL4, the selection unit SEL4 selects and outputs the logical sum signal. When the selection signal 1 is input to the selector SEL4, the selector SEL4 selects and outputs a pseudo header signal. The logical sum signal or the pseudo-header signal output from the selector SEL4 is used for discriminating the header field from the recording field.

Next, the operation of the data reproducing circuit 38 shown in FIG. 14 will be described with reference to the timing chart of FIG.

FIG. 15 shows a header field HF1,
Recording field RE1, header field H
5 is a timing chart showing a state in which F2 and a recording field RE2 are reproduced in order. Note that the recording field RE1 is a header field H
This is an area following F1. The header field HF2 is an area following the recording field RE1. The recording field RE2 has a header field HF.
This is an area that follows 2.

It is assumed that the header detection circuit 120 detects the header field HF1 and outputs a header signal from the header detection circuit 120 (t1 to t5). During this time, the counter 124 does not output the count value Ns. Therefore, the selection signal 0 is output from the pseudo header signal generator 124. Therefore, the selection signal SEL4 is supplied with the selection signal 0, and the selection unit SEL4 outputs a logical sum signal. The AM detection unit 102 receives the logical sum signal output from the selection unit SEL4, and detects an address mark (AM) from the data supplied from the PLL circuit 100. That is, an address mark is detected from each of the header 1 field, header 2 field, header 3 field, and header 4 field included in the header field HF1.

For example, without detecting an address mark from the header 1 field, the header 2 field, the header 3
It is assumed that an address mark is detected from each of the field and the header 4 fields. That is, it is assumed that the header 1 field is not detected (header 1 NG), and the header 2 field, the header 3 field, and the header 4 field are each detected (header 2 OK, header 3 OK, header 4 OK).

Here, it is assumed that there is no error in PID2 by the error detection code IED recorded in the header 2 field (PID2OK). Along with this,
Select signal 01 is output from register control section 110.
Upon receiving the selection signal 01, the selection unit SEL3 selects and outputs the data 2. The data 2 is input to the pseudo header signal generation unit 124 and loaded by the counter 126 (t2). The counter 126 counts Nrs (t6) according to the data 2. The count value Ns (t7) and the count value Nrs (t15) are output.

It is also assumed that there is no error in PID3 by the error detection code IED recorded in the header 3 field (PID3OK). Accordingly, the selection signal 10 is output from the register control unit 110. Receiving the selection signal 10, the selector SEL3 selects and outputs the data 3. This data 3 is transmitted to the pseudo header signal generator 1
24, and loaded by the counter 126 (t3). The counter 126 counts Nrs (t6) according to the data 3. The count value Ns (t7) and the count value Nrs (t15) are output.

Further, it is assumed that there is no error in PID4 by the error detection code IED recorded in the header 4 field (PID4OK). Along with this,
The selection signal 11 is output from the register control unit 110.
Receiving the selection signal 11, the selector SEL3 selects and outputs the data 4. The data 4 is input to the pseudo header signal generation unit 124 and loaded by the counter 126 (t4). The counter 126 counts Nrs (t6) according to the data 3. The count value Ns (t7) and the count value Nrs (t15) are output.

Data 1, data 2, data 3, and data 4 are data that make the output timings of the count value Nrs and the count value Ns from the counter 126 all the same. That is, no matter which of data 1, data 2, data 3, and data 4 is loaded by the counter 126, the count value Nrs is output at the timing of t6 and t15, and the count value Ns is output at the timing of t7. . More specifically, data 1,
The data 2, data 3, and data 4 are counted by the counter 126 at the timing when the synchronization code recorded in the VFO3 field of the recording field RE1 and the VFO3 field of the recording field RE2 is reproduced.
To output the count value Nrs.
Data 1, data 2, data 3, and data 4
Is data that causes the counter 126 to output the count value Ns at the timing when the buffer field of the recording field RE1 is reproduced.

The pseudo-header signal generator 124 starts outputting the pseudo-header signal at the timing when the data 2 is loaded by the counter 126 (t2), and outputs the pseudo-header signal until the counter 126 outputs the counter value Nrs (t6). The output of the header signal is continued (t2 to t6). Further, the pseudo header signal generation unit 124 starts outputting the pseudo header signal at the timing when the data 3 is loaded by the counter 126 (t3), and the counter 126 outputs the counter value Nr.
Until s is output (t6), the output of the pseudo header signal is continued (t3 to t6). Further, the pseudo header signal generation unit 124 starts outputting the pseudo header signal at the timing when the data 4 is loaded by the counter 126 (t
4) The output of the pseudo header signal is continued until the counter value Nrs is output from the counter 126 (t6) (t6).
4-t6).

As a result, the pseudo header signal is
26 until (t2) the counter value Nrs is output from the counter 126 (t2).
6) Output. During this time, the pseudo header signal generation unit 126
Outputs a selection signal 0. Therefore, the selector SEL4 selects and outputs the logical sum signal output from the logical sum circuit 128.

The pseudo-header signal generator 124 starts outputting the pseudo-header signal at the timing when the counter 126 outputs the counter value Ns (t7), and until the counter 126 outputs the counter value Nrs (t1).
5) Continue outputting the pseudo header signal (t7 to t1)
5). Further, the pseudo-header signal generation unit 124 starts outputting the selection signal 1 at the timing when the counter value Ns is output from the counter 126 (t7), and selects the counter signal until the counter value Nrs is output from the counter 126 (t15). The output of the signal 1 is continued (t7 to t15). Therefore, the selector SEL4 selects and outputs the pseudo header signal.

On the other hand, a part of the header field HF2 is detected by the header detection circuit, and the header detection circuit 12
It is assumed that a header signal is output from 0 (t10 to t1).
4). Incidentally, t8 to t10 indicate that the header signal is missing. According to the present invention, even if part of the header signal is missing (t8 to t10), the pseudo header signal (t7 to t7)
By relying on 15), the header field HF2 and the recording field RE2 can be accurately identified, and the recording field RE2 can be normally reproduced. In the timing chart of FIG. 15, the header field H using the pseudo header signal (t7 to t15) is used.
This indicates that all the PID data of F2 has been successfully reproduced (PID1OK, PID2OK, PID3O
K, PID4OK). In this case, data 1, data 2,
Data 3 and data 4 are loaded into the counter 126 at predetermined timings (t9, t11, t12, t1).
3). As a result, the count value Nrs and the count value Ns are output from the counter 126 at a predetermined timing.

In general, data reproduction at the boundary between the header field and the recording field, that is, at the boundary between the emboss recording field and the phase change recording field tends to be unstable. Therefore, the pseudo-header signal starts outputting and ends outputting while avoiding the boundary between the header field and the recording field. Specifically, from the buffer field of the recording field RE1, the recording field RE
2 up to the VFO3 field (count value N
In the case of a pseudo header signal output with the output of s). Thereby, the recording field can be further stably reproduced.

From the header field HF2,
It is assumed that the header 1 field, the header 2 field, the header 3 field, and the header 4 field have not been detected. That is, it is assumed that no PID data has been reproduced from the header field HF2. In such a case,
The reproduction of the header field HF3 following the recording field HF2 is performed in the same manner as the reproduction of the header field HF1.

[0177]

According to the present invention, it is possible to normally reproduce data recorded in a recording field and record data in the recording field without being adversely affected by the detection of an unstable header field. An optical disk device can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining the concept of a zone of an optical disc.

FIG. 2 is a diagram for explaining an outline of a data structure of an optical disc.

FIG. 3 is a diagram for explaining a rotation speed corresponding to each zone of the optical disc and the number of sectors per track in each zone.

FIG. 4 is a diagram for explaining a sector format of an optical disc.

FIG. 5 is a diagram for explaining a header field provided between a groove sector and a groove sector or between a land sector and a land sector.

FIG. 6 is a diagram for explaining a header field provided between a groove sector and a land sector or a land sector.

FIG. 7 is a diagram for explaining a header field provided between a groove sector and a land sector.

FIG. 8 is a diagram for explaining a header field provided between a groove sector and a land sector.

FIG. 9 is a perspective view showing the structure of an optical disc.

FIG. 10 is a diagram showing a schematic configuration of a cutting device.

FIG. 11 is a diagram illustrating a cutting modulation signal and a wobble control signal generated by a format circuit of the cutting device.

FIG. 12 is a diagram for explaining a cutting modulation signal for forming a single spiral.

FIG. 13 is a diagram showing a schematic configuration of an optical disk device.

FIG. 14 is a diagram showing a schematic configuration of a data reproducing circuit of the optical disk device.

FIG. 15 is a timing chart showing the operation of the data reproduction circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical disk 5 ... Optical head 10 ... Memory 38 ... Data reproduction circuit 35 ... Laser drive circuit 39 ... Semiconductor laser 50 ... CPU 100 ... PLL circuit 102 ... AM detection part 104 ... Timing generation part 106 ... S / P conversion part 108 ... 8/16 modulation section 110 register control section 114 comparison section 116 calculation section 120 header detection circuit 122 memory 124 pseudo header signal generation section 126 counter 128 OR circuit SEL1, SEL2, SEL3, SEL4 selection Department

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI G11B 20/12 G11B 20/12

Claims (22)

[Claims] An optical disk having a header area in which header data is recorded and a data recording area subsequent to the header area and receiving or recording data based on the header data recorded in the header area. An optical disc device for reproducing various data including the header data, a reproducing unit for reproducing the header data from the optical disc, and a pseudo data based on predetermined data included in the header data reproduced by the reproducing unit. An optical disk device comprising: a pseudo header signal output unit that outputs a pseudo header signal indicating that a header area has been detected at a predetermined timing. 2. An optical disc having a header area in which header data is recorded, and a data recording area subsequent to the header area and receiving or recording data based on the header data recorded in the header area. An optical disc apparatus for reproducing various data including the header data, a first reproducing unit for reproducing the header data from the optical disk, and a predetermined data included in the header data reproduced by the first reproducing unit. Pseudo header signal output means for outputting at a predetermined timing a pseudo header signal indicating that the header area has been detected in a pseudo manner, based on the pseudo header signal output by the pseudo header signal output means, Second reproducing means for reproducing data recorded in the recording area. An optical disc device characterized by the above-mentioned. 3. An optical disk having a header area in which header data is recorded, and a data recording area following the header area and receiving or recording data based on the header data recorded in the header area. An optical disc device for reproducing various data including the header data, a reproducing unit for reproducing the header data from the optical disc, and a pseudo data based on predetermined data included in the header data reproduced by the reproducing unit. Pseudo header signal output means for outputting at a predetermined timing a pseudo header signal indicating that a header area has been detected; and data for the data recording area based on the pseudo header signal output by the pseudo header signal output means. Recording means for recording information, and an optical disc characterized by comprising: apparatus. 4. A first data indicating a first header data.
The first header data including the identification data of the first header data and the second header data substantially the same as the first header data.
And a header area in which second header data including second identification data indicating that the header data is the header data, and an area subsequent to the header area and the first and second header data recorded in the header area. An optical disc apparatus for reproducing various data including the header data from an optical disc having a data recording area for recording or reproducing data based on the header data, wherein the reproducing means reproduces the first and second header data from the optical disc When the reproducing means reproduces the first identification data included in the first header data,
A first pseudo header signal indicating that the header area has been detected in a pseudo manner is output at a first timing based on the identification data, and the reproduction means outputs the first pseudo header signal included in the first header data. When the second identification data included in the second header data is reproduced without reproducing the identification data, it indicates that the header area is detected in a pseudo manner based on the second identification data. Second
And a pseudo header signal output means for outputting the pseudo header signal at a second timing. 5. A first data indicating that the data is the first header data.
The first header data including the identification data of the first header data and the second header data substantially the same as the first header data.
And a header area in which second header data including second identification data indicating that the header data is the header data, and an area subsequent to the header area and the first and second header data recorded in the header area. An optical disc device for reproducing various data including the header data from an optical disc having a data recording area for recording or reproducing data based on the header data, wherein the first and second header data are reproduced from the optical disc; When the first identification data included in the first header data is reproduced by the first reproduction means, the header area is detected in a pseudo manner based on the first identification data. A first pseudo header signal indicating that the first reproduction has been performed is output at a first timing, and the first reproduction means outputs the first pseudo header signal.
The first identification data included in the second header data is not reproduced, and the second identification data included in the second header data is not reproduced.
A pseudo-header signal output means for outputting at a second timing a second pseudo-header signal indicating that the header area has been pseudo-detected, based on the second identification data, The first header output by the pseudo header signal output means.
And a second reproducing means for reproducing data recorded in the data recording area based on one of the pseudo header signal and the second pseudo header signal. 6. A first data indicating a first header data.
The first header data including the identification data of the first header data and the second header data substantially the same as the first header data.
And a header area in which second header data including second identification data indicating that the header data is the header data, and an area subsequent to the header area and the first and second header data recorded in the header area. An optical disc apparatus for reproducing various data including the header data from an optical disc having a data recording area for recording or reproducing data based on the header data, wherein the reproducing means reproduces the first and second header data from the optical disc When the reproducing means reproduces the first identification data included in the first header data,
A first pseudo header signal indicating that the header area has been detected in a pseudo manner is output at a first timing based on the identification data, and the reproduction means outputs the first pseudo header signal included in the first header data. When the second identification data included in the second header data is reproduced without reproducing the identification data, it indicates that the header area is detected in a pseudo manner based on the second identification data. Second
Pseudo-header signal output means for outputting the pseudo-header signal at a second timing; and the first header signal output by the pseudo-header signal output means.
Recording means for recording data in the data recording area based on one of the pseudo-header signal and the second pseudo-header signal. 7. An optical disk having a header area in which header data is recorded, and a data recording area subsequent to the header area and receiving or recording data based on the header data recorded in the header area. An optical disc device for reproducing various data including the header data, a first reproducing unit for reproducing the header data from the optical disc, and the header area based on the header data reproduced by the first reproducing unit. A header signal output unit that outputs a header signal indicating that the header region has been detected; and a pseudo-detection of the header region based on predetermined data included in the header data reproduced by the first reproducing unit. Pseudo header signal output means for outputting a pseudo header signal at a predetermined timing; Based on the header signal output by the signal output unit and the pseudo header signal output by the pseudo header signal output unit, the header area and the data recording area are identified, and the data recorded in the data recording area is identified. An optical disk device comprising: a second reproducing unit that reproduces the data. 8. An optical disc having a header area in which header data is recorded, and a data recording area following the header area and receiving or recording data based on the header data recorded in the header area. An optical disc device for reproducing various data including the header data, a reproducing unit for reproducing the header data from the optical disk, and a header indicating that the header area is detected based on the header data reproduced by the reproducing unit. A header signal output unit for outputting a signal; and a pseudo header signal indicating that the header area has been detected in a pseudo manner based on predetermined data included in the header data reproduced by the reproduction unit, at a predetermined timing. Pseudo-header signal output means, and the header signal output means Recording means for identifying the header area and the data recording area based on the output header signal and the pseudo header signal output by the pseudo header signal output means, and recording data in the data recording area An optical disk device, comprising: 9. A first data indicating that the data is the first header data.
The first header data including the identification data of the first header data and the second header data substantially the same as the first header data.
And a header area in which second header data including second identification data indicating that the header data is the header data, and an area subsequent to the header area and the first and second header data recorded in the header area. An optical disc device for reproducing various data including the header data from an optical disc having a data recording area for recording or reproducing data based on the header data, wherein the first and second header data are reproduced from the optical disc; And the first and second reproduced by the first reproducing means.
Header signal output means for outputting a header signal indicating that the header area has been detected, based on the header data, and the first identification data included in the first header data is reproduced by the first reproduction means. When this is done, a first pseudo header signal indicating that the header area has been detected in a pseudo manner is output at a first timing based on the first identification data, and the first reproduction means outputs the first pseudo header signal.
The first identification data included in the second header data is not reproduced, and the second identification data included in the second header data is not reproduced.
A pseudo-header signal output means for outputting at a second timing a second pseudo-header signal indicating that the header area has been pseudo-detected, based on the second identification data, Based on one of the header signal output by the header signal output means and one of the first and second pseudo header signals output by the pseudo header signal output means, An optical disc apparatus comprising: a second reproducing unit that identifies an area and the data recording area, and reproduces data recorded in the data recording area. 10. The first header data including first identification data indicating the first header data, and the second header data substantially the same as the first header data. And a header area in which second header data including second identification data indicating that the first and second header data have been recorded, and the first and second header data recorded in the header area and subsequent to the header area. An optical disc device for reproducing various data including the header data from an optical disc having a data recording area for receiving or recording data based on the reproduction means for reproducing the first and second header data from the optical disc; Outputting a header signal indicating that the header area has been detected, based on the first and second header data reproduced by the reproducing means; A header signal output means that the when the first identification data included in the first header data is reproduced by the reproducing means, the first
A first pseudo header signal indicating that the header area has been detected in a pseudo manner is output at a first timing based on the identification data, and the reproduction means outputs the first pseudo header signal included in the first header data. When the second identification data included in the second header data is reproduced without reproducing the identification data, it indicates that the header area is detected in a pseudo manner based on the second identification data. Second
Pseudo-header signal output means for outputting the pseudo-header signal at a second timing, the header signal output by the header signal output means, and the first and second pseudo-header signal output means by the pseudo header signal output means. Recording means for identifying the header area and the data recording area based on one of the pseudo header signals of the pseudo header signal and recording data in the data recording area. Optical disk device. 11. The pseudo-header signal output means, from when the first identification data included in the first header data is reproduced to when a synchronization code recorded in the data recording area is reproduced. A first output unit for outputting the first pseudo header signal, and a synchronization code recorded in the data recording area after the second identification data included in the second header data is reproduced. And a second output means for outputting the second pseudo header signal until is reproduced. 11. The apparatus according to claim 5, wherein: Optical disk device. 12. A first header area in which first header data is recorded, and a first area following the first header area, the first header area being subjected to data recording or reproduction based on the first header data. A data recording area, an area following the first data recording area, a second header area in which second header data is recorded, and an area following the second header area, the second header area An optical disc device for reproducing various data including the first and second header data from an optical disc having a second data recording area for receiving or recording data based on data, wherein the first and second data are reproduced from the optical disc. A reproducing unit for reproducing the header data; and a pseudo data for the first header based on predetermined data included in the first header data reproduced by the reproducing unit. Header signal output means for outputting, at predetermined timings, a first pseudo header signal indicating that the second header area has been detected and a second pseudo header signal indicating that the second header area has been detected. An optical disk device, comprising: 13. A first header area in which first header data is recorded, a first header area following the first header area, and a first header area for receiving data recording or reproduction based on the first header data. A data recording area, an area following the first data recording area, a second header area in which second header data is recorded, and an area following the second header area, the second header area An optical disc device for reproducing various data including the first and second header data from an optical disc having a second data recording area for receiving or recording data based on data, wherein the first and second data are reproduced from the optical disc. First reproducing means for reproducing header data; and pseudo data based on predetermined data included in the first header data reproduced by the first reproducing means. The first pseudo header signal indicating that the first header area has been detected, and the second pseudo header signal indicating that the second header area has been detected pseudo at a predetermined timing. Header signal output means; and the first signal output by the pseudo header signal output means.
A second reproduction for reproducing the data recorded in the first data recording area based on the pseudo header signal of the above, and reproducing the data recorded in the second data recording area based on the second pseudo header signal. And an optical disk device comprising: 14. A first header area in which first header data is recorded, a first header area following the first header area, and a first header area for receiving data recording or reproduction based on the first header data. A data recording area, an area following the first data recording area, a second header area in which second header data is recorded, and an area following the second header area, the second header area An optical disc device for reproducing various data including the first and second header data from an optical disc having a second data recording area for receiving or recording data based on data, wherein the first and second data are reproduced from the optical disc. A reproducing unit for reproducing the header data; and a pseudo data for the first header based on predetermined data included in the first header data reproduced by the reproducing unit. Header signal output means for outputting, at predetermined timings, a first pseudo header signal indicating that the second header area has been detected and a second pseudo header signal indicating that the second header area has been detected. The first header output by the pseudo header signal output means.
Recording means for recording data in the first data recording area based on the pseudo-header signal, and recording data in the second data recording area based on the second pseudo-header signal. An optical disk device characterized by the above-mentioned. 15. First header data including first identification data indicating the first header data, and second header data substantially identical to the first header data. A first header area in which second header data including second identification data indicating that the first header area is recorded, and an area subsequent to the first header area, wherein
Or a first data recording area for recording or reproducing data based on the second header data, an area subsequent to the first data recording area, and third identification data indicating third header data And fourth header data including fourth identification data indicating substantially the same data as the third header data and the fourth header data. The second header area, and an optical disc having a second data recording area subsequent to the second header area and receiving or recording data based on the third or fourth header data. An optical disk device for reproducing various data including first, second, third, and fourth header data, wherein the first, second, third, and fourth header data are read from the optical disk. Reproducing means for reproducing the first identification data included in the first header data by the reproducing means.
Outputting, at a first timing, a first pseudo header signal indicating that the first header area has been detected in a pseudo manner, based on the identification data of the above, and detecting the second header area in a pseudo manner. Is output at a second timing, and the reproduction means outputs the first pseudo header signal.
The first identification data included in the second header data is not reproduced, and the second identification data included in the second header data is not reproduced.
When the identification data is reproduced, a third pseudo header signal indicating that the first header area has been detected in a pseudo manner is output at a third timing based on the second identification data. An optical disk device comprising: a pseudo-header signal output unit that outputs the second pseudo-header signal indicating that the second header area has been detected, at the second timing. 16. First header data including first identification data indicating the first header data, and second header data substantially the same as the first header data. A first header area in which second header data including second identification data indicating that the first header area is recorded, and an area subsequent to the first header area, wherein
Or a first data recording area for recording or reproducing data based on the second header data, an area subsequent to the first data recording area, and third identification data indicating third header data And fourth header data including fourth identification data indicating that the data is substantially the same as the third header data and is the fourth header data. The second header area, and an optical disc having a second data recording area subsequent to the second header area and receiving or recording data based on the third or fourth header data. An optical disk device for reproducing various data including first, second, third, and fourth header data, wherein the first, second, third, and fourth header data are read from the optical disk. A first reproducing means for reproducing the first identification data included in the first header data by the first reproducing means, based on the first identification data, A first pseudo header signal indicating that the first header area has been detected is output at a first timing, and the second pseudo header signal is pseudo-detected by the second pseudo header signal.
A second pseudo header signal indicating that the header area has been detected is output at a second timing, and the first identification data included in the first header data is not reproduced by the first reproducing means. When the second identification data included in the second header data is reproduced, a third indication indicating that the first header area has been artificially detected based on the second identification data. Pseudo header signal to third
Pseudo-header signal output means for outputting at the second timing the second pseudo-header signal indicating that the second header area has been pseudo-detected, and outputting the pseudo-header signal. Said first output by means
And reproducing the data recorded in the first data recording area based on one of the pseudo-header signals of the second pseudo-header signal and the third pseudo-header signal. An optical disc device comprising: a second reproducing unit that reproduces data recorded in a data recording area. 17. First header data including first identification data indicating the first header data, and second header data substantially identical to the first header data. A first header area in which second header data including second identification data indicating that the first header area is recorded, and an area subsequent to the first header area, wherein
Or a first data recording area for recording or reproducing data based on the second header data, an area subsequent to the first data recording area, and third identification data indicating third header data And fourth header data including fourth identification data indicating substantially the same data as the third header data and the fourth header data. The second header area, and an optical disc having a second data recording area subsequent to the second header area and receiving or recording data based on the third or fourth header data. An optical disk device for reproducing various data including first, second, third, and fourth header data, wherein the first, second, third, and fourth header data are read from the optical disk. Reproducing means for reproducing the first identification data included in the first header data by the reproducing means.
Outputting, at a first timing, a first pseudo header signal indicating that the first header area has been detected in a pseudo manner, based on the identification data of the above, and detecting the second header area in a pseudo manner. Is output at a second timing, and the reproduction means outputs the first pseudo header signal.
The first identification data included in the second header data is not reproduced, and the second identification data included in the second header data is not reproduced.
When the identification data is reproduced, a third pseudo header signal indicating that the first header area has been detected in a pseudo manner is output at a third timing based on the second identification data. Pseudo-header signal output means for outputting the second pseudo-header signal indicating that the second header area has been detected at the second timing; and the first pseudo-header signal output means output by the pseudo-header signal output means.
And data is recorded in the first data recording area on the basis of one of the pseudo header signals and the third pseudo header signal, and the second data is recorded on the basis of the second pseudo header signal. An optical disc device comprising: a recording unit that records data in a recording area. 18. A first header area in which first header data is recorded, an area following the first header area, and a first area for receiving data recording or reproduction based on the first header data. A data recording area, an area following the first data recording area, a second header area in which second header data is recorded, and an area following the second header area, the second header area An optical disc device for reproducing various data including the first and second header data from an optical disc having a second data recording area for receiving or recording data based on data, wherein the first and second data are reproduced from the optical disc. First reproducing means for reproducing header data; and detecting the first header area based on the first header data reproduced by the first reproducing means. Header signal output means for outputting a first header signal indicating that the second header area has been detected based on the second header data, and outputting a second header signal indicating that the second header area has been detected. A first pseudo header signal indicating that the first header area has been detected in a pseudo manner based on predetermined data included in the first header data reproduced by the means; Pseudo header signal output means for outputting at each predetermined timing a second pseudo header signal indicating that a header area has been detected; the first header signal output by the header signal output means; and the pseudo header signal The first header area and the first data recording area are identified based on the first pseudo header signal output by the output means, and written in the first data recording area. Data to play,
The second header output by the pseudo header signal output means;
And a second reproducing unit for recognizing the second header area and the second data recording area based on the pseudo header signal and reproducing the data recorded in the second data recording area. An optical disc device characterized by the above-mentioned. 19. A first header area in which first header data is recorded, an area subsequent to the first header area, and a first header area for receiving data recording or reproduction based on the first header data. A data recording area, an area following the first data recording area, a second header area in which second header data is recorded, and an area following the second header area, the second header area An optical disc device for reproducing various data including the first and second header data from an optical disc having a second data recording area for receiving or recording data based on data, wherein the first and second data are reproduced from the optical disc. Reproducing means for reproducing the header data; and a first signal indicating that the first header area is detected based on the first header data reproduced by the reproducing means. A header signal output unit that outputs a header signal and outputs a second header signal indicating that the second header area has been detected based on the second header data; and the first signal reproduced by the reproduction unit. A first pseudo header signal indicating that the first header area has been detected in a pseudo manner based on the predetermined data included in the header data of the first header data, and indicating that the second header area has been detected in a pseudo manner. Pseudo header signal output means for outputting a second pseudo header signal at a predetermined timing, respectively; the first header signal output by the header signal output means; and the first header signal output by the pseudo header signal output means. And identifying the first header area and the first data recording area based on the pseudo-header signal, and recording data in the first data recording area. The second header area and the second data recording area are identified based on the second pseudo header signal output by the pseudo header signal output means, and data is written to the second data recording area. An optical disc device, comprising: recording means for recording. 20. First header data including first identification data indicating the first header data, and second header data substantially identical to the first header data. A first header area in which second header data including second identification data indicating that the first header area is recorded, and an area subsequent to the first header area, wherein
Or a first data recording area for recording or reproducing data based on the second header data, an area subsequent to the first data recording area, and third identification data indicating third header data And fourth header data including fourth identification data indicating substantially the same data as the third header data and the fourth header data. The second header area, and an optical disc having a second data recording area subsequent to the second header area and receiving or recording data based on the third or fourth header data. An optical disk device for reproducing various data including first, second, third, and fourth header data, wherein the first, second, third, and fourth header data are read from the optical disk. A first reproducing means for reproducing the first or second, the first or second reproduced by the first reproducing means.
A first header signal indicating that the first header area is detected based on the header data is output, and a second header signal indicating that the second header area is detected based on the third or fourth header data is output. Header signal output means for outputting a second header signal; and when the first identification data included in the first header data is reproduced by the first reproduction means, based on the first identification data, A first pseudo header signal indicating that the first header area has been detected is output at a first timing, and the second pseudo header signal is output in a pseudo manner.
A second pseudo header signal indicating that the header area has been detected is output at a second timing, and the first identification data included in the first header data is not reproduced by the first reproducing means. When the second identification data included in the second header data is reproduced, a third indication indicating that the first header area has been artificially detected based on the second identification data. Pseudo header signal to third
Pseudo header signal output means for outputting at the second timing the second pseudo header signal indicating that the second header area has been detected in a pseudo manner, and the header signal output means The first header signal based on the first header signal output from the first header signal and the pseudo header signal output from the first and third pseudo header signals output from the pseudo header signal output means. Identifying the area and the first data recording area, reproducing the data recorded in the first data recording area, and based on the second pseudo header signal, the second header area and the second An optical disc device comprising: a second reproducing unit that identifies a data recording area and reproduces data recorded in the second data recording area. 21. First header data including first identification data indicating the first header data, and second header data substantially the same as the first header data. A first header area in which second header data including second identification data indicating that the first header area is recorded, and an area subsequent to the first header area, wherein
Or a first data recording area for recording or reproducing data based on the second header data, an area subsequent to the first data recording area, and third identification data indicating third header data And fourth header data including fourth identification data indicating substantially the same data as the third header data and the fourth header data. The second header area, and an optical disc having a second data recording area subsequent to the second header area and receiving or recording data based on the third or fourth header data. An optical disk device for reproducing various data including first, second, third, and fourth header data, wherein the first, second, third, and fourth header data are read from the optical disk. And a first header signal indicating that the first header area has been detected based on the first or second header data reproduced by the reproducing means, and Header signal output means for outputting a second header signal indicating that the second header area has been detected based on fourth header data; and the first means included in the first header data by the reproduction means. When the identification data is reproduced, the first
Outputting, at a first timing, a first pseudo header signal indicating that the first header area has been detected in a pseudo manner, based on the identification data of the above, and detecting the second header area in a pseudo manner. Is output at a second timing, and the reproduction means outputs the first pseudo header signal.
The first identification data included in the second header data is not reproduced, and the second identification data included in the second header data is not reproduced.
When the identification data is reproduced, a third pseudo header signal indicating that the first header area has been detected in a pseudo manner is output at a third timing based on the second identification data. Pseudo header signal output means for outputting at the second timing the second pseudo header signal indicating that the second header area has been detected, and the first pseudo header signal output by the header signal output means. The first header area and the first data recording are performed based on a header signal and either one of the first and third pseudo header signals output by the pseudo header signal output means. Identifying an area, and recording data in the first data recording area;
Recording means for identifying the second header area and the second data recording area based on the pseudo-header signal, and recording data in the second data recording area. Optical disk device. 22. The pseudo-header signal output means reproduces the synchronization code recorded in the first data recording area after reproducing the first identification data included in the first header data. A first output unit that outputs the first pseudo header signal until the first data recording area corresponding to a boundary between the first data recording area and the second header area. A second output unit that outputs the second pseudo header signal from a time when the predetermined area is reproduced to a time when the synchronization code recorded in the second data recording area is reproduced; The third pseudo header signal is output from the time when the second identification data included in the header data is reproduced to the time when the synchronization code recorded in the first data recording area is reproduced. And the output means of 3. 22. The optical disk device according to claim 17, wherein the optical disk device comprises: