JP3872887B2 - Optical disk device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical disc such as a DVD (Digital Video Disk) -RAM (Random Access Memory) for recording predetermined information. The present invention also relates to an optical disc apparatus for reproducing data recorded on an optical disc and recording data on the optical disc.
[0002]
[Prior art]
In general, a groove track is formed on an optical disc by discontinuous spiral grooves. A track corresponding to a position between the groove tracks is called a land track. A header field is formed between the tracks. In this header field, header data relating to a land track or groove track area (recording field) following the header field is embossed. The header data is arranged in a staggered manner with respect to the land track and the groove track.
[0003]
The reflected light of the light beam emitted to the header field has certain characteristics due to the influence of the header data arranged in a staggered manner in the header field. Conventionally, the header field is detected by detecting this feature. When the header field is detected, various data included in the header data of the header field are detected. Then, the recording field is reproduced based on the detected various data. Alternatively, data is recorded in the recording field.
[0004]
[Problems to be solved by the invention]
In the conventional header field detection as described above, since the header field is detected from a relatively unstable element such as the characteristic of reflected light, there is a problem in the detection accuracy. If the reliability of detection is low, there may be a problem that reproduction of the recording field or data recording to the recording field cannot be normally performed.
[0005]
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 detection of an unstable header field. There is.
[0006]
[Means for Solving the Problems]
In order to solve the above problems and achieve the object, the optical disc apparatus of the present invention is configured as follows.
[0010]
The present invention includes first header data (header 1 field) including first identification data (PID1) indicating the first header data, and data substantially the same as the first header data. The header area (header field HF1) in which the second header data (header 2 field) including the second identification data (PID2) indicating the second header data is recorded, and this header area are continued. Various data including the header data are reproduced from an optical disc having a data recording area (recording field RE1) for recording or reproducing data based on the first and second header data recorded in the header area. In the optical disc apparatus, the player for reproducing the first and second header data from the optical disc When the reproduction means reproduces the first identification data included in the first header data, the first identification data indicates that the header area is detected in a pseudo manner based on the first identification data. The pseudo header signal is output at a first timing, and the second identification data included in the second header data is not reproduced by the reproduction unit without reproducing the first identification data included in the first header data. Pseudo header signal output means for outputting, at a second timing, a second pseudo header signal indicating that the header area is detected in a pseudo manner based on the second identification data. It has.
[0011]
The present invention provides first header data including first identification data indicating first header data, and data substantially the same as the first header data, and the second header data. A header area in which the second header data including the second identification data indicating the presence is recorded, and an area subsequent to the header area, and 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 in an optical disc apparatus for reproducing various data including the header data from an optical disc having a data recording area for receiving or recording data based thereon; When the first identification data included in the first header data is reproduced by the first reproduction means, the first identification data is reproduced. The first pseudo header signal indicating that the header area is detected in a pseudo manner is output at a first timing, and the first reproduction means includes the first pseudo header signal included in the first header data. When the identification data is not reproduced and the second identification data included in the second header data is reproduced, it indicates that the header area is detected in a pseudo manner based on the second identification data. A pseudo header signal output means for outputting a second pseudo header signal at a second timing, and a pseudo header of either one of the first and second pseudo header signals output by the pseudo header signal output means And a second reproducing means for reproducing the data recorded in the data recording area based on the signal.
[0012]
The present invention provides first header data including first identification data indicating first header data, and data substantially the same as the first header data, and the second header data. A header area in which the second header data including the second identification data indicating the presence is recorded, and an area subsequent to the header area, and the first and second header data recorded in the header area. In an optical disk apparatus for reproducing various data including the header data from an optical disk having a data recording area on which data is recorded or reproduced based on the reproduction means, the reproduction means for reproducing the first and second header data from the optical disk, and the reproduction When the first identification data included in the first header data is reproduced by the means, based on the first identification data, Similarly, a first pseudo header signal indicating that the header area has been detected is output at a first timing, and the first identification data included in the first header data is not reproduced by the reproducing means. In addition, when the second identification data included in the second header data is reproduced, a second pseudo header signal indicating that the header area is detected in a pseudo manner based on the second identification data. On the basis of one of the pseudo header signals output from the pseudo header signal output means and the pseudo header signal output means output from the pseudo header signal output means. Recording means for recording data in the recording area.
[0013]
The present invention relates to an optical disc having a header area in which header data is recorded, and a data recording area that is subsequent to the header area and receives data recording or reproduction based on the header data recorded in the header area. In an optical disk apparatus for reproducing various data including header data, a first reproducing means for reproducing the header data from the optical disk, and the header area is detected based on the header data reproduced by the first reproducing means. And a pseudo 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 first reproducing means and a header signal output means for outputting a header signal indicating Pseudo header signal output means for outputting a header signal at a predetermined timing; and the header signal Based on the header signal output by the output means and the pseudo header signal output by the pseudo header signal output means, the header area and the data recording area are identified, and the data recorded in the data recording area is Second reproducing means for reproducing.
[0014]
The present invention relates to an optical disc having a header area in which header data is recorded, and a data recording area that is subsequent to the header area and receives data recording or reproduction based on the header data recorded in the header area. In an optical disk apparatus for reproducing various data including header data, a reproducing means for reproducing the header data from the optical disk, and a header signal indicating that the header area is detected based on the header data reproduced by the reproducing means 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 reproducing means. The pseudo header signal output means and the header signal output means Recording means for identifying the header area and the data recording area on the basis of the generated header signal and the pseudo header signal output by the pseudo header signal output means, and recording data in the data recording area; It has.
[0015]
The present invention provides first header data including first identification data indicating first header data, and data substantially the same as the first header data, and the second header data. A header area in which the second header data including the second identification data indicating the presence is recorded, and an area subsequent to the header area, and 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 in an optical disc apparatus for reproducing various data including the header data from an optical disc having a data recording area for receiving or recording data based thereon; A header signal indicating that the header area has been detected based on the first and second header data reproduced by the first reproducing means. When the first identification data included in the first header data is reproduced by the header signal output means for outputting the first identification data and the first reproduction means, the pseudo identification is performed based on the first identification data. A first pseudo header signal indicating that the header area has been detected is output at a first timing, and the first identification data included in the first header data is not reproduced by the first reproduction means. When the second identification data included in the second header data is reproduced, based on the second identification data, a second pseudo header signal indicating that the header area is detected in a pseudo manner is generated. A pseudo header signal output means for outputting at a second timing, the header signal outputted by the header signal output means, and before being outputted by the pseudo header signal output means Second reproduction for identifying the header area and the data recording area based on one of the first and second pseudo header signals and reproducing the data recorded in the data recording area Means.
[0016]
The present invention provides first header data including first identification data indicating first header data, and data substantially the same as the first header data, and the second header data. A header area in which the second header data including the second identification data indicating the presence is recorded, and an area subsequent to the header area, and the first and second header data recorded in the header area. In an optical disk apparatus for reproducing various data including the header data from an optical disk having a data recording area on which data is recorded or reproduced based on the reproduction means, the reproduction means for reproducing the first and second header data from the optical disk, and the reproduction A header signal indicating that the header area has been detected is output based on the first and second header data reproduced by the means. When the first identification data included in the first header data is reproduced by the header signal output means and the 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 identification data included in the first header data is not reproduced by the reproduction means, and the second header data is output to the second header data. When the second identification data included is reproduced, a pseudo pseudo signal for outputting a second pseudo header signal indicating that the header area is detected in a pseudo manner based on the second identification data is output at a second timing. A header signal output means; the header signal output by the header signal output means; and the first and second pseudo signals output by the pseudo header signal output means. Based on either of the pseudo header signal of the Da signal identifies the header area and the data recording area, and a recording means for recording data on the data recording area.
[0020]
The present invention includes first header data (header 1 field) including first identification data (PID1) indicating the first header data, and data substantially the same as the first header data. A first header area (header field HF1) in which second header data (header 2 field) including second identification data (PID2) indicating the second header data is recorded; A first data recording area (recording field RE1) that receives or records data based on the first or second header data, and an area that follows the first data recording area. Third header data (header 1 field) including third identification data (PID1) indicating the third header data, and this 2nd header area in which 4th header data (header 2 field) containing the 4th identification data which is the data substantially the same as 3 header data and which is 4th header data is recorded (Header field HF2), and a second data recording area (recording field RE2) that is subsequent to the second header area and receives or records data based on the third or fourth header data. In an optical disc apparatus for reproducing various data including the first, second, third, and fourth header data from an optical disc, the first, second, third, and fourth header data are reproduced from the optical disc. Reproducing means for reproducing the first identification data included in the first header data by the reproducing means. Based on the data, the first pseudo header signal indicating that the first header area has been detected in a pseudo manner is output at the first timing, and the second header area has been detected in a pseudo manner. The second pseudo-header signal is output at a second timing, and the first identification data included in the first header data is not reproduced by the reproducing unit, and is included in the second header data. When the second identification data is reproduced, based on the second identification data, a third pseudo header signal indicating that the first header area is detected in a pseudo manner is output at a third timing. And a pseudo header signal output means for outputting the second pseudo header signal indicating that the second header area is detected in a pseudo manner at the second timing.
[0021]
The present invention provides first header data including first identification data indicating first header data, and data substantially the same as the first header data, and the second header data. A first header area in which second header data including second identification data indicating the presence is recorded, an area subsequent to the first header area, and data based on the first or second header data A first data recording area to be recorded or reproduced, a third header data including a third identification data indicating a third header data which is an area following the first data recording area, and A second header area in which fourth header data including fourth identification data indicating substantially the same data as the third header data and the fourth header data is recorded; and First The first, second, third, and fourth optical discs have a second data recording area that is an area following the header area and that receives or records data based on the third or fourth header data. In the optical disk apparatus for reproducing various data including the header data, the first reproducing means for reproducing the first, second, third, and fourth header data from the optical disk, and the first reproducing means When the first identification data included in the first header data is reproduced, a first pseudo header indicating that the first header area is detected in a pseudo manner based on the first identification data A signal is output at a first timing, and a second pseudo header signal indicating that the second header area is detected in a pseudo manner is output at a second timing. When the first identification data included in the first header data is not reproduced by the means and the second identification data included in the second header data is reproduced, the second identification data is reproduced. Based on the above, a third pseudo header signal indicating that the first header area is detected in a pseudo manner is output at a third timing, and the second header area is indicated in a pseudo manner. A pseudo header signal output means for outputting a second pseudo header signal at the second timing, and a pseudo one of the first and third pseudo header signals output by the pseudo header signal output means. The data recorded in the first data recording area is reproduced based on the header signal, and the data recorded in the second data recording area based on the second pseudo header signal And a second reproducing means for reproducing.
[0022]
The present invention provides first header data including first identification data indicating first header data, and data substantially the same as the first header data, and the second header data. A first header area in which second header data including second identification data indicating the presence is recorded, an area subsequent to the first header area, and data based on the first or second header data A first data recording area to be recorded or reproduced, a third header data including a third identification data indicating a third header data which is an area following the first data recording area, and A second header area in which fourth header data including fourth identification data indicating substantially the same data as the third header data and the fourth header data is recorded; and First The first, second, third, and fourth optical discs have a second data recording area that is an area following the header area and that receives or records data based on the third or fourth header data. In the optical disk apparatus for reproducing various data including the header data, reproduction means for reproducing the first, second, third, and fourth header data from the optical disk, and the first header data by the reproduction means When the first identification data included in the first reproduction data is reproduced, a first pseudo header signal indicating that the first header area is detected in a pseudo manner is used as a first timing based on the first identification data. And a second pseudo header signal indicating that the second header area has been detected in a pseudo manner is output at a second timing, and the playback means outputs the second pseudo header signal. When the second identification data included in the second header data is reproduced without reproducing the first identification data included in the header data, the pseudo identification is based on the second identification data. A second pseudo header signal indicating that the first header area has been detected at a third timing, and the second pseudo header indicating that the second header area has been detected in a pseudo manner. Based on a pseudo header signal output means for outputting a signal at the second timing, and a pseudo header signal of one of the first and third pseudo header signals output by the pseudo header signal output means, Recording means for recording data in the first data recording area and recording data in the second data recording area based on the second pseudo header signal; ing.
[0023]
The present invention provides a first header area in which first header data is recorded, an area that follows the first header area, and receives data recording or reproduction based on the first header data. A recording area, a second header area following the first data recording area where the second header data is recorded, and an area following the second header area, the second header data In the optical disk apparatus for reproducing various data including the first and second header data from an optical disk having a second data recording area that receives or records data based on the first and second headers from the optical disk First detection means for reproducing data, and detection of the first header area based on the first header data reproduced by the first reproduction 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; and the first reproduction means 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 first header data, and the second header in a pseudo manner A pseudo header signal output means for outputting a second pseudo header signal indicating that an area has been detected at a predetermined timing, the first header signal output by the header signal output means, and the pseudo header signal output. Based on the first pseudo header signal output by the means, the first header area and the first data recording area are identified and recorded 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 the second data recording Second reproducing means for reproducing data recorded in the area.
[0024]
The present invention provides a first header area in which first header data is recorded, an area that follows the first header area, and receives data recording or reproduction based on the first header data. A recording area, a second header area following the first data recording area where the second header data is recorded, and an area following the second header area, the second header data In the optical disk apparatus for reproducing various data including the first and second header data from an optical disk having a second data recording area that receives or records data based on the first and second headers from the optical disk A reproduction unit for reproducing data, and a first header indicating that the first header area is detected based on the first header data reproduced by the reproduction unit. Header signal output means for outputting a second header signal indicating that the second header area is detected based on the second header data, and the first signal reproduced by the reproducing means. The first pseudo header signal indicating that the first header area has been detected in a pseudo manner and the second header area having been detected in a pseudo manner based on predetermined data included in the header data. Pseudo header signal output means for outputting a second pseudo header signal at a predetermined timing, the first header signal output by the header signal output means, and the first header signal output by the pseudo header signal output means Based on one pseudo header signal, the first header area and the first data recording area are identified, and data is recorded in the first data recording area. Based on the second pseudo header signal output by the pseudo header signal output means, the second header area and the second data recording area are identified, and data is recorded in the second data recording area. Recording means.
[0025]
The present invention provides first header data including first identification data indicating first header data, and data substantially the same as the first header data, and the second header data. A first header area in which second header data including second identification data indicating the presence is recorded, an area subsequent to the first header area, and data based on the first or second header data A first data recording area to be recorded or reproduced, a third header data including a third identification data indicating a third header data which is an area following the first data recording area, and A second header area in which fourth header data including fourth identification data indicating substantially the same data as the third header data and the fourth header data is recorded; and First The first, second, third, and fourth optical discs have a second data recording area that is an area following the header area and that receives or records data based on the third or fourth header data. In the optical disk apparatus for reproducing various data including the header data, the first reproducing means for reproducing the first, second, third, and fourth header data from the optical disk, and the first reproducing means A first header signal indicating that the first header area has been detected is output based on the reproduced first or second header data, and the second header data is output based on the third or fourth header data. Header signal output means for outputting a second header signal indicating that a header area has been detected, and the first identification data included in the first header data by the first reproduction means When generated, based on the first identification data, a first pseudo header signal indicating that the first header area has been detected in a pseudo manner is output at a first timing, and the first A second pseudo header signal indicating that the second header area is detected is output at a second timing, and the first identification data included in the first header data is reproduced by the first reproduction means. When the second identification data included in the second header data is reproduced, a third indicating that the first header area has been detected in a pseudo manner based on the second identification data. The pseudo header signal for outputting the second pseudo header signal indicating that the second header area has been detected in a pseudo manner is output at the second timing. One of a pseudo signal of signal output means, the first header signal output from the header signal output means, and the first and third pseudo header signals output from the pseudo header signal output means. Based on the header signal, the first header area and the first data recording area are identified, the data recorded in the first data recording area is reproduced, and on the basis of the second pseudo header signal, the And a second reproducing means for identifying the second header area and the second data recording area and reproducing the data recorded in the second data recording area.
[0026]
The present invention provides first header data including first identification data indicating first header data, and data substantially the same as the first header data, and the second header data. A first header area in which second header data including second identification data indicating the presence is recorded, an area subsequent to the first header area, and data based on the first or second header data A first data recording area to be recorded or reproduced, a third header data including a third identification data indicating a third header data which is an area following the first data recording area, and A second header area in which fourth header data including fourth identification data indicating substantially the same data as the third header data and the fourth header data is recorded; and First The first, second, third, and fourth optical discs have a second data recording area that is an area following the header area and that receives or records data based on the third or fourth header data. In the optical disk apparatus for reproducing various data including the header data, reproduction means for reproducing the first, second, third, and fourth header data from the optical disk, and the first reproduced by the reproduction means Alternatively, the first header signal indicating that the first header area is detected based on the second header data is output, and the second header area is detected based on the third or fourth header data. When the first identification data included in the first header data is reproduced by the reproduction means and a header signal output means for outputting a second header signal indicating Based on the first identification data, a first pseudo header signal indicating that the first header area has been detected in a pseudo manner is output at a first timing, and the second header area is set in a pseudo manner. A second pseudo header signal indicating detection is output at a second timing, and the second header is not reproduced by the reproducing means without reproducing the first identification data included in the first header data. When the second identification data included in the data is reproduced, a third pseudo header signal indicating that the first header area has been detected in a pseudo manner is generated 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 in a pseudo manner, and outputting the second pseudo header signal at the second timing. Based on one of the first header signal output by the signal output means and the first and third pseudo header signals output by the pseudo header signal output means, Identifying the first header area and the first data recording area, recording data in the first data recording area, and based on the second pseudo header signal, the second header area and the first data recording area Recording means for identifying a second data recording area and recording data in the second data recording area.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0028]
First, an outline of a DVD (Digital Video Disk) -RAM (random access memory) as an optical disk will be described with reference to FIGS. FIG. 1 is a diagram for explaining the concept of a zone of an optical disc. 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 rotational 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 are diagrams for explaining a header field provided between a groove sector and a groove sector or between a land sector and a land sector. 7 and 8 are diagrams for explaining the header field provided between the groove sector and the land sector. FIG. 9 is a perspective view showing the structure of the optical disc.
[0029]
As shown in FIGS. 1 and 2, the optical disc 1 can be divided into a lead-in area 2, a data area 3, and a lead-out area 4. Each area is composed of a plurality of zones, and each zone is composed of a plurality of tracks.
[0030]
The lead-in area 2 includes an embossed data zone 5 and a rewritable data zone 6. In the emboss data zone 5, reference signals and control data are recorded at the time of manufacture. 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. .
[0031]
The data area 3 is composed of a plurality of zones, for example, zones 3a,... 3x.
[0032]
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 contents as the data zone 6 is recorded.
[0033]
In addition, the optical disc 1 has a different number of sectors per track on the inner and outer peripheral sides. 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 rotation speed (rotation speed) of the optical disk 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 as it goes from the inner circumference side to the outer circumference side of the optical disc 1.
[0034]
As shown in FIG. 1 and FIG. 2, the data in the zone 3a,. To be recorded.
[0035]
Next, the sector format will be described with reference to FIG.
[0036]
As shown in FIG. 4, one sector is composed of approximately 2697 bytes. In this sector, data modulated by 8-16 modulation is recorded. 8-16 modulation is a modulation scheme that modulates 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, 1 byte has the same meaning as 16 channel bits.
[0037]
Here, the breakdown 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).
[0038]
In the header field, predetermined data is embossed and recorded (preformatted) as an uneven shape in the optical disk manufacturing process. In this header field, four sector addresses are written in order to improve the header detection accuracy. 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 header 3 field are composed of 46 bytes. The header 2 field and the header 4 field are composed of 18 bytes.
[0039]
The header 1 field and the header 3 field are a 36-byte synchronization code VFO (Variable Frequency Oscillator) 1 field, a 3-byte address mark AM (Address Mark) field, a 4-byte address PID (Physical ID) 1 field, and 2 bytes. Error detection code IED (ID Error Detection Code) 1 field and 1-byte postamble PA (Post Ambles) 1 field.
[0040]
The header 2 field and header 4 field are composed of an 8-byte synchronization code VFO2 field, a 3-byte address mark AM field, a 4-byte address PID2 field, a 2-byte error detection code IED2 field, and a 1-byte postamble PA2 field. Has been.
[0041]
Sector information and a sector number are recorded in the PID field (PID1, PID2, PID3, and PID4 fields). The PID field will be described in detail later.
[0042]
In the VFO field (VFO1 field, VFO2 field), a continuous repetitive pattern (1000001000 ...) for recording a PLL (Phase Locked Loop) is recorded. More specifically, the pattern recorded in the VFO field is for frequency synchronization for reproducing the information recorded in the PID field.
[0043]
An address mark (AM) is recorded in the AM field, and this address mark plays a role of detecting a block boundary when demodulating a fixed-length block code. More specifically, the address mark recorded in the AM field indicates the position of the address information recorded in the PID field. For the address mark recorded in the AM field, a special pattern that does not appear elsewhere (a pattern of run-length restriction violation) is used.
[0044]
An error detection code for the PID field is recorded in the IED field (IED1, IED2, IED3, and IED4 fields), and the presence or absence of an error in the read PID field is detected by the error detection code.
[0045]
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.
[0046]
The mirror field is a specular field, and this field is used for gain adjustment of a photodetector, which will be described later.
[0047]
The recording field is a field mainly responsible for recording user data. The recording field includes a (10 + J / 16) byte gap field, a (20 + K) byte guard 1 field, a 35 byte VFO3 field, a 3 byte PS (pre-synchronous code) field, and a 2418 byte data field (user data field). ) It is composed of a 1-byte postamble PA3 field, a (55-K) byte guard 2 field, and a (25-J / 16) byte buffer field. Incidentally, J is an integer of 0 to 15 and K is an integer of 0 to 7 and takes a random value. As a result, the data writing start position is randomly shifted. As a result, deterioration of the recording film due to overwriting can be reduced.
[0048]
The gap field is a field where nothing is recorded.
[0049]
The guard 1 field is a discarded data area for absorbing the deterioration at the beginning of the repeated overwrite unique to the phase change recording film.
[0050]
Although the VFO3 field is also a field for PLL lock, it is a field intended to synchronize byte boundaries by inserting a synchronization code into the same pattern.
[0051]
The PS field is a field in which a synchronization code is recorded, and is provided for detecting a block boundary.
[0052]
The data field is a field including a data ID, a data ID error correction code IED (Data ID Error Detection Code), a synchronization code, an ECC (Error Collection Code), an EDC (Error Detection Code), 2048-byte user data, and the like. is there. The data ID is sector ID1 to ID16 having a 4-byte (32 channel bit) configuration of each sector. The data ID error correction code IED is an error correction code having a 2-byte (16 bits) configuration for data ID.
[0053]
The postamble PA3 field includes state information necessary for demodulation and is a field indicating the end of the last byte of the previous data field.
[0054]
The guard 2 field is a field provided in order to prevent the terminal deterioration at the time of repeated recording unique to the phase change recording medium from reaching the data field.
[0055]
The buffer field is a field provided to absorb fluctuations in the rotation of the motor that rotates the optical disc 1 so that the data field does not cover the next header field.
[0056]
Next, the PID field (PID1 field, PID2 field, PID3 field, PID4 field) will be specifically described. The PID 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, sector address data is recorded.
[0057]
Further, this sector information is composed of a 2-bit reserve field, a 2-bit PID number field, a 3-bit sector type field, and a 1-bit layer number field.
[0058]
Nothing is recorded in the reserved field.
[0059]
A PID number is recorded in the PID number field. For example, “00” indicating PID1 in the PID number field in the header 1 field, “01” indicating PID2 in the PID number field in the header 2 field, and PID3 in the PID number field in the header 3 field “ “10”, “11” indicating PID4 is recorded in the PID number field in the header 4 field.
[0060]
In the present invention, the land track and the groove track are identified from the relationship of the sector number recorded in the sector number field in the header 1 field to the header 4 field.
[0061]
In the sector type field, “000” indicating a read-only sector, “001”, “010”, or “011” indicating a reserved sector (Reserved), a land or groove track “100” indicating the rewritable first sector, “101” indicating the rewritable last sector of the land or groove track, “100” indicating the land or groove track “110” indicating that it is a sector immediately before the last rewritable sector (Rewritable before last sector), and “111” indicating that it is a rewritable other sector of a land or groove track. Is recorded.
[0062]
In the layer number field, “1” or “0” indicating layer 1 or 0 is recorded.
[0063]
Subsequently, a header field provided between a groove sector and a groove 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 diagrams showing a part of the information recording area of the optical disc.
[0064]
5 and 6, land sector L01, groove sector G11, land sector L21, groove sector G31, land sector L41, and groove sector G51 are provided from the outer peripheral side to the inner peripheral side of the optical disc. The situation is shown. Further, the distance from the center to the center of adjacent tracks is referred to as a track pitch. For example, the distance from the center of the track where the land sector L22 is provided to the center of the track where the groove sector G32 is provided is the track pitch. Note that N in FIG. 6 indicates the number of sectors per track (one round), and the value of N is an integer between 17 and 40.
[0065]
7 and 8 show a state in which 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 peripheral side to the inner peripheral side of the optical disc. Has been. Further, the distance from the center to the center of adjacent tracks is referred to as a track pitch. For example, the track pitch is the distance from the center of the track where the land sector L40 is provided to the center of the track where the groove sector G50 is provided. Note that 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.
[0066]
First, a header field provided between a groove sector and a groove sector or between a land sector and a land sector will be described with reference to FIGS.
[0067]
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 located on the same line as the tangent line between the land sector L02 and the groove sector G12 (or the land sector L01 and the groove sector G11). The centers of the pits constituting the header 3 field H22-3 and the header 4 field H22-4 exist 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). The centers of the pits constituting the header 1 field H32-1 and the header 2 field H32-2 exist on the extension of the tangent line between the land sector L22 and the groove sector G32 (or the land sector L21 and the groove sector G31). The centers of the pits constituting the header 3 field H42-3 and the header 4 field H42-4 exist on an extension of a tangent line between the groove sector G32 and the land sector L42 (or the groove sector G31 and the land sector L41). The centers of the pits constituting the header 1 field H52-1 and the header 2 field H52-2 exist on an extension of the tangent line between the land sector L42 and the groove sector G52 (or the land sector L41 and the groove sector G51). The centers of the pits constituting the header 3 field H62-3 and the header 4 field H62-4 exist on an extension of the tangent line between the groove sector G52 and the land sector L62 (or the groove sector G51 and the land sector L61).
[0068]
Further, the sector numbers of the headers of the header field 11 provided between the groove sectors have a relationship as shown in FIG. For example, a description will be given by taking the sector number of the header field provided between the groove sector G11 and the groove sector G12 as an example. A header 1 field H12-1, a header 2 field H12-2, a header 3 field H22-3, and a header 4 field H22-4 are provided between the groove sector G11 and the groove sector G12. 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), the sector number of the header 3 field H22-3 is (n + 2N), and the header 4 field H22-4 The sector number is (n + 2N). That is, when the sector numbers of the headers provided between the groove sector and the groove 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 obtained. To establish.
[0069]
On the other hand, the sector numbers of the headers in the header field 11 provided between the land sectors have a relationship as shown in FIG. For example, a description will be given taking the sector number of each header provided between the land sector L21 and the land sector L22 as an example. Between the land sector L21 and the land sector L22, a header 1 field H32-1, a header 2 field H32-2, a header 3 field H22-3, and a header 4 field H22-4 are provided. The sector number of the header 1 field H32-1 is (n + N), the sector number of the header 2 field H32-2 is (n + N), the sector number of the header 3 field H22-3 is (n + 2N), and the header 4 field H22-4. The sector number is (n + 2N). That is, when comparing the sector numbers of the headers provided between the land sectors, the relationship of (sector number of header 1 field or header 2 field) <(sector number of header 3 field or header 4 field) is obtained. To establish.
[0070]
That is, 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 by header reproduction, the sector (track) after this header is a groove sector. (Groove track) is identified and reproduction processing corresponding to the groove sector can be performed. On the other hand, 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 by header reproduction, the sector (track) after this header becomes a land. It is identified as a sector (land track), and reproduction processing corresponding to the land sector can be performed.
[0071]
Subsequently, a header field provided between the groove sector and the land sector, that is, at the change of the groove and land will be described with reference to FIGS.
[0072]
The header field 11 is provided with a plurality of pits P as shown in FIG. The centers of the pits constituting the header 3 field H20-3 and the header 4 field H20-4 are on an extension of the tangent line between the groove sector G10 and the land sector L20. The centers of the pits constituting the header 1 field H30-1 and the header 2 field H30-2 exist on an extension of the tangent line between the land sector L20 and the groove sector G30 (or the groove sector G1n and the land sector L2n). The centers of the pits constituting the header 3 field H40-3 and the header 4 field H40-4 exist on an extension of the tangent line between the groove sector G30 and the land sector L40 (or the land sector L2n and the groove sector G3n). The centers of the pits constituting the header 1 field H50-1 and the header 2 field H50-2 exist on an extension of the tangent line between the land sector L40 and the groove sector G50 (or the groove sector G3n and the land sector L4n). The centers of the pits constituting the header 3 field H60-3 and the header 4 field H60-4 exist on an extension of a tangent line between the groove sector G50 and the land sector L60 (or the land sector L4n and the groove sector G5n). The centers of the pits constituting the header 1 field H70-1 and the header 2 field H70-2 are on the extension of the tangent line between the land sector L60 and the groove sector G70.
[0073]
Further, the sector numbers of the headers in the header field 11 provided between the land sector and the groove sector (when changing from the land sector to the groove sector) have a relationship as shown in FIG. For example, description will be made by taking the 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 are provided. The sector number of the header 1 field H30-1 is (m + 3N), 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 H40-4. The sector number is (m + 2N). That is, when comparing the sector numbers of the headers 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) To establish.
[0074]
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, description will be made by taking the sector number of each header provided between the groove sector G3n and the land sector L40 as an example. Between the groove sector G3n and the land sector L40, a header 1 field H50-1, a header 2 field H50-2, a header 3 field H40-3, and a header 4 field H40-4 are provided. The sector number of the header 1 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 header 4 field H40-4. The sector number is (m + 2N). That is, when comparing the sector numbers of the headers provided between the groove sector and the land sector, the relationship of (sector number of header 1 field or header 2 field) <(sector number of header 3 field or header 4 field) To establish.
[0075]
That is, 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 by header reproduction, the sector (track) after this header is a groove sector. (Groove track) is identified and reproduction processing corresponding to the groove sector can be performed. On the other hand, 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 by header reproduction, the sector (track) after this header becomes a land. It is identified as a sector (land track), and reproduction processing corresponding to the land sector can be performed.
[0076]
As described above with reference to FIGS. 5 to 8, the subsequent sector (track) is determined based on the magnitude relationship between the header 1 field (or header 2 field) and the header 3 field (or header 4 field) obtained by header reproduction. Whether a land sector (land track) or a groove sector (groove track) can be identified.
[0077]
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.
[0078]
A method in which the groove track and the land track are switched every round is called a single spiral method. In an optical disc adopting such a single spiral method, as described above, by cutting the header field between the land track and the groove track, 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. FIG. 7 and FIG. 8 described above show the header field of the first sector. 5 to 8, when the track is traced in a spiral shape, the polarity of tracking is switched to land, groove, land, groove,...
[0079]
Thus, in the single spiral system in which the groove and the land are switched every round, it is necessary to switch the polarity between the groove track and the land track during tracking. For this reason, the sector at the switching from the groove track to the land track or from the land track to the groove track has a header arrangement different from other sectors.
[0080]
Here, a method for 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 board is rotated, laser light is irradiated to the rotated photoresist board, and tracks and headers are exposed and recorded on the photoresist board. When the photoresist board on which the track and header are recorded by exposure is developed, the exposed portion of the photoresist dissolves in the developer, and the track and header are formed on the photoresist board.
[0081]
In this way, the process of forming the track and the header on the photoresist board is called a cutting process, and this cutting process is realized by the cutting device. That is, the cutting apparatus is provided with an optical head for irradiating the photoresist board with laser light. Further, metal is vapor-deposited on the photoresist board on which the track and header are formed, and the master is produced. The master is plated with Ni, and the Ni plating layer is peeled off from the master. The peeled Ni plating layer becomes an optical disc mold called a stamper. An optical disk is manufactured using this stamper as a mold.
[0082]
In the cutting process described above, the optical head of the cutting apparatus is moved at a constant speed from the inner periphery to the outer periphery by the track pitch for each rotation of the disk. The portion irradiated with the laser light is a groove, and the portion not irradiated is a land.
[0083]
FIG. 8 shows three sectors of the first sector, sector numbers m, (m + N), and (m + 2N). In the cutting process, after the land sector L4n, the header 1 field H50-1 and the header 2 field H50-2 are recorded by shifting outward by a half track pitch from the track center of the land sector L4n. The Further, the header 1 field H50-3 and the header 2 field H50-4 are recorded by shifting inward by a half track pitch from the center of the track of the land sector L4n.
[0084]
Further, the mirror part is generated when the laser beam is not irradiated. A groove part is produced | generated by irradiating a laser beam. At this time, the laser beam spot is sine-wave oscillated with a period of 186 channel bits from the inner periphery to the outer periphery, so that a groove is formed. This signal component can be used as a reference signal for clock generation during data write. Recording is performed in the above-described procedure for one round from the sector number m to the sector number (m + N−1). The laser beam is not irradiated for one turn from the sector number (m + N) to the sector number (m + 2N−1). By repeating this operation, a header field as shown in FIG. 8 is formed.
[0085]
5 and 6 show header structures other than the first sector. By the cutting process as described above, the header 1 field and header 2 field which are the first half header of the groove sector, and the header 3 field and header 4 field which are the second half header are recorded. The first half header and the second half header of the land sector are recorded with a difference of one turn.
[0086]
Next, the structure of the optical disc will be described with reference to FIG.
[0087]
An optical disk substrate 200 is made of a transparent material such as plastic and is duplicated by a mold called a stamper. A header field and a recording field are recorded on the substrate 200. In the header field, header information is recorded by the embossed pits P. In the recording field, a groove track GT and a land track LT are formed.
[0088]
Further, when viewed from the incident side 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. On the uneven recording surface of the substrate 100, a protective film 201, a recording film 202, a protective film 203, and a reflective film 204 are formed in this order from the substrate 200 side. A one-dot chain line in the figure indicates the center of the groove track GT or the land track LT. The emboss pits P constituting the header field are located on a line shifted by Wt / 2 from the center lines of the groove track GT and the land track LT. Here, Wt represents a track pitch and is a distance between the center of the groove track GT and the center of the land track LT.
[0089]
The emboss pits P are generated in a zigzag pattern by wobbling the laser spot by Wt / 2 when cutting the groove track GT.
[0090]
As shown in FIGS. 6 and 8, the staggered emboss pits P are provided in the header field, so that 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 embossed pit P can be cut with the same beam. Therefore, the cutting device can be greatly simplified.
[0091]
Next, the cutting apparatus will be described with reference to FIGS. FIG. 10 is a diagram illustrating a schematic configuration of the cutting apparatus. FIG. 11 is a diagram for explaining the cutting modulation signal and the wobble control signal generated by the formatting circuit of the cutting apparatus. FIG. 12 is a diagram for explaining a cutting modulation signal for forming a single spiral.
[0092]
First, a schematic configuration of the cutting apparatus 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 that adjusts the optical axis. In the laser optical axis control system 142, the optical axis of the laser light is adjusted. The laser light via the laser optical axis control system 142 is reflected by the mirror 143 and is incident on the beam modulation system 144 controlled by the format circuit 149.
[0093]
The beam modulation system 144 includes an acoustooptic modulator (AOM) 144a and an acoustooptic modulator (AOM). The acousto-optic modulator 144a modulates the laser light in accordance with the cutting modulation signal supplied from the format circuit 149. The acoustooptic deflector 144b deflects the laser light in accordance with the instruction supplied from the format circuit 149. The format circuit 149 includes a ROM 150, and generates a cutting signal for determining a laser output and an exposure part, and a wobble control signal indicating a wobble amount and a wobble direction. The ROM 150 will be described in detail later.
[0094]
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. The laser light that has passed through the beam modulation system 144 is incident on a beam shaping system 145 including a pinhole and a slit. In the beam shaping system 145, the beam diameter and shape of the laser light are adjusted. The laser light that has passed through the beam shaping system 145 enters the beam monitor system 146. The beam monitor system 146 monitors the beam shape of the laser light.
[0095]
The laser light that has passed through the beam monitor system 146 is guided to Mira-147 and focused and irradiated onto the photoresist board 14O by the objective lens 148. The photoresist board 140 is a glass disk coated with a photoresist. The portion of the photoresist board irradiated with the laser light is formed into a concave shape by etching.
[0096]
At the time of cutting, the photoresist board 140 is rotated at a constant speed by the spindle motor 139. Further, the photoresist board 140 is moved in a predetermined direction by the feed screw 151 while being integrated with the spindle motor 139. By this movement, the laser light irradiated through the objective lens 148 is moved from the inner peripheral side of the photoresist board 140 to the outer peripheral side. Incidentally, the feed screw 151 moves the photoresist board 140 integrated with the spindle motor 139 under the control of the feed control device 152. Under the control of the feed control device 152, the laser beam is moved from the inner circumference side to the outer circumference side by the track pitch per rotation of the photoresist board 140. Further, the portion irradiated with the laser beam moved in this manner is a group track, and the portion not irradiated is a land track. Further, the laser beam is blinked to form embossed pits constituting the header field.
[0097]
Here, the ROM 150 provided in the format circuit 149 will be described. The ROM 150 stores a conversion table for realizing 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 conversion code). The cutting modulation signal is generated on the basis of the conversion code converted by the conversion table.
[0098]
Next, the cutting modulation signal and the wobble control signal generated by the format circuit 149 will be described with reference to FIG.
[0099]
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, the level of the cutting modulation signal is proportional to the output of the laser beam.
[0100]
The wobble control signal is a signal for controlling the deflection angle in the acousto-optic deflector 144b in order to shift the beam position. If the wobble control signal is greater than the zero level, the beam irradiation position moves upward with respect to the center position of the track. If the wobble control signal is smaller than zero level, the beam irradiation position moves downward with respect to the center position of the track.
[0101]
As shown in FIG. 11, the portions where the wobble control signal has a value greater than the zero level, that is, the header 1 and header 2 portions are shifted upward from the center position of the track. On the other hand, the portion where the wobble control signal is smaller than the zero level, that is, the header 3 and header 4 portions are shifted downward from the center position of the track. In the portion where the wobble control signal is zero level, that is, the groove portion, a groove is formed at the center position of the track.
[0102]
Further, when the cutting modulation signal is at a high level, a concave shape is formed on the master. Therefore, emboss pits are formed when the cutting modulation signal is at a high level.
[0103]
Next, a cutting modulation signal for forming a single spiral will be described with reference to FIG.
[0104]
The cutting modulation signals a to d are all signals corresponding to one track.
[0105]
Corresponding to the low (LOW) level cutting modulation signal a, a land track LT constituting the track a is formed. Corresponding to the high-level cutting modulation signal a, a groove track GT constituting the track a is formed.
[0106]
Corresponding to the low (LOW) level cutting modulation signal b, a land track LT constituting the track b is formed. Corresponding to the high-level cutting modulation signal b, a groove track GT constituting the track b is formed.
[0107]
Corresponding to the low (LOW) level cutting modulation signal c, a land track LT constituting the track c is formed. Corresponding to the high-level cutting modulation signal c, a groove track GT constituting the track c is formed.
[0108]
Corresponding to the low (LOW) level cutting modulation signal d, a land track LT constituting the track d is formed. A groove track GT constituting the track d is formed corresponding to the high (HIGH) level cutting modulation signal d.
[0109]
A single spiral structure is realized by switching the cutting modulation signal to 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 board is rotated once.
[0110]
Next, an optical disc apparatus 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 disc apparatus. FIG. 14 is a diagram showing a schematic configuration of a data reproducing circuit of the optical disc apparatus.
[0111]
First, the schematic configuration of the optical disc apparatus will be described with reference to FIG.
[0112]
The optical disc apparatus irradiates a focused light beam to the optical disc 1, receives the reflected light of the light beam from the optical disc 1, and records the data recorded on the optical disc 1 reflected in the received reflected light. Are to be played. In addition, this optical disc apparatus records a data on the light beam 1 by irradiating the optical disc 1 with a light beam.
[0113]
As shown in FIG. 13, the optical disc 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 at, for example, a different rotational speed for each zone. The spindle motor 23 is controlled by a motor control circuit 24.
[0114]
Data recorded on the optical disc 1 is reproduced by the optical head 25. As will be described later, the spindle motor 23 and the optical head 25 are provided on a fixed base.
[0115]
The optical head 25 is fixed to a drive coil 27 that constitutes a movable portion of the linear motor 26, and the drive coil 27 is connected to a linear motor control circuit 28.
[0116]
On the other hand, a speed detector 29 is connected to the linear motor control circuit 28 that drives the linear motor 26, and the speed signal of the optical head 25 detected by the speed detector 29 is sent to the linear motor control circuit 28. The moving speed of the optical head 25 is controlled.
[0117]
An 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). The objective lens 30 is moved in the focusing direction (the optical axis direction of the lens) by the drive coil 31, and is moved in the tracking direction (the direction orthogonal to the optical axis of the lens) by the drive coil 32.
[0118]
Further, a semiconductor laser 39 as an irradiation means for irradiating a light beam is driven by a laser driving circuit 35 to generate a laser beam. The laser drive circuit 35 corrects the light amount of the laser beam generated by the semiconductor laser 39 in accordance with the monitor current from the monitoring photodiode PD of the semiconductor laser 39.
[0119]
The laser drive circuit 35 operates in synchronization with a clock signal for data recording or data reproduction from a PLL circuit (not shown). The PLL circuit divides 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, when a laser beam for data recording is generated from the semiconductor laser 39, control is performed so as to generate a high-power laser beam that is higher by a predetermined level than the laser beam for data reproduction.
[0120]
The laser beam generated by the semiconductor laser 39 driven by the laser driving circuit 35 is collimated by the collimator lens 40, and then the optical path is bent at a substantially right angle by the half prism 41. That is, the laser beam generated from the semiconductor laser 39 by the half prism 41 is irradiated 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.
[0121]
Then, the reflected light beam from the data recording surface of the optical disc 1 is transmitted through the objective lens 30 and the half prism 41, and passes through the condenser lens 42 and the cylindrical lens 43 to the photodetector 44 as the detection means. Led.
[0122]
The photodetector 44 is constituted by, for example, four-divided photodetector cells 44a, 44b, 44c, and 44d.
[0123]
The output signal of the light detection cell 44a included in the light detector 44 is supplied to one end of the adder 46a via the amplifier 45a, and the output signal of the light detection cell 44b is supplied to one end of the adder 46b via the amplifier 45b. To be supplied. The output signal of the photodetection cell 44c is supplied to the other end of the adder 46a via the amplifier 45c, and the output signal of the photodetection cell 44d is supplied to the other end of the adder 46b via the amplifier 45d. .
[0124]
The output signal of the photodetection cell 44a included in the photodetector 44 is supplied to one end of the adder 46c via the amplifier 45a, and the output signal of the photodetection cell 44b is added to the adder 46d via the amplifier 45b. Is supplied to one end. The output signal of the photodetection cell 44c is supplied to the other end of the adder 46d via the amplifier 45c, and the output signal of the photodetection cell 44d is supplied to the other end of the adder 46c via the amplifier 45d. .
[0125]
The output signal of the adder 46a is supplied to the inverting input terminal of the differential amplifier OP2, and the output signal of the adder 46b is supplied to the non-inverting input terminal of the differential amplifier OP2. Accordingly, the differential amplifier OP2 supplies a signal related to the focus point, that is, a focus error signal, to the focusing control circuit 47 in accordance with the difference between the adders 46a and 46b. An output signal from the focusing control circuit 47 is supplied to the drive coil 31 and controlled so that the laser beam is always in a just focus on the data recording surface of the optical disc 1.
[0126]
The output signal of the adder 46c is supplied to the inverting input terminal of the differential amplifier OP1, and the output signal of the adder 46d is supplied to the non-inverting input terminal of the differential amplifier OP1. Thus, the differential amplifier OP1 supplies a tracking error signal to the tracking control circuit 48 according to the difference between the adders 46c and 46d. The tracking control circuit 48 creates a track drive signal according to the tracking error signal supplied from the differential amplifier OP1.
[0127]
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.
[0128]
The sum signal of the outputs of the light detection cells 44a to 44d of the light detector 44 in a state where the focusing control and the tracking control are performed in this way, that is, the output signals from the adders 46c and 46d are added by the adder 46e. The signal reflects changes in reflectance from pits formed on the track, that is, recorded data. This signal is supplied to a data reproduction circuit 38 as reproduction means, and the data reproduction circuit 38 reproduces data recorded on the data recording surface of the optical disk.
[0129]
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 given to the reproduction data, and then via an interface circuit 55. It is output to the optical disk control device 56 as an external device.
[0130]
A data generation circuit 34 is provided in the previous stage of the laser drive circuit 35. The data generation circuit 34 converts ECC block format data as recording data supplied from the error correction circuit 52 into recording ECC block format data to which a synchronization code for ECC block is added. A generation circuit 34a 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.
[0131]
The data generation circuit 34 is supplied with the record data to which the error correction code is given by the error correction circuit 52 and the error check dummy data read from the memory 10. The error correction circuit 52 is supplied with recording data from an optical disk control device 56 as an external device via an interface circuit 55 and a bus 49.
[0132]
The error correction circuit 52 assigns error correction codes in the horizontal direction and the vertical direction to the recording data in units of 4 Kbytes for the recording data of 32 Kbytes supplied from the optical disk control device 56, and also provides a sector ID (logic Address number) and format data of the ECC block is generated.
[0133]
Further, in this optical disc apparatus, a D / D used to exchange information between the focusing control circuit 47, the tracking control circuit 48, the linear motor control circuit 28, and the CPU 50 that controls the entire optical disc apparatus. An A converter 51 is provided.
[0134]
The motor control circuit 24, linear motor control circuit 28, laser drive circuit 35, data reproduction circuit 38, focusing control circuit 47, tracking control circuit 48, error correction circuit 53, etc. are controlled by the CPU 50 via the bus 49. The CPU 50 performs a predetermined operation according to a control program recorded in the memory 10.
[0135]
The memory 10 stores a control program and is used for data recording. This memory 10 has a table 10a in which the relationship between speed data (number of rotations) and the number of sectors per track is recorded for each zone.
[0136]
Next, a schematic configuration of the data reproduction circuit 38 will be described with reference to FIG.
[0137]
The signal supplied to the data reproduction circuit 38 (the signal output from the adder 46e) is supplied to the PLL circuit 100 and the header detection circuit 120. The PLL circuit 100 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 OR signal and pseudo header signal output from the selection unit SEL4 will be described in detail later. The AM detection circuit 102 detects an address mark (AM) from the data supplied from the PLL circuit 100 by receiving supply of a logical sum signal or a pseudo header signal. When the AM detection circuit 102 detects an address mark, the timing generation unit 104 generates a timing control signal based on the detection of the address mark.
[0138]
On the other hand, the data extracted by the PLL circuit 100 is also supplied to the S / P converter 106. The S / P converter 106 converts the 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 demodulator 108 performs 8/16 demodulation processing on the parallel data supplied from the S / P converter 106. As a result, 8-bit demodulated data is output from the 8/16 demodulator 108.
[0139]
As shown in FIG. 4, the 4-byte data after the address mark recorded in the AM field is PID data. Further, the 2 bytes after the PID data are IED data. Therefore, reproduction of PID data and IED data is realized by the timing control signal generated by the timing generation unit 104, that is, the timing reference signal generated based on the detection of the address mark.
[0140]
Here, control of the register by the register control unit 110 will be described. When it is determined from the IED data in the IED1 field 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 already described, “00” is recorded as the PID number in the PID1 field. In the PID2 field, “01” is recorded as the PID number. In the PID3 field, “10” is recorded as the PID number. In the PID4 field, “11” is recorded as the PID number. That is, PID1 data, PID2 data, PID3 data, and PID4 data are distinguished by referring to the PID number. When “00” is confirmed as the PID number, the register control unit 110 writes the PID1 data of the PID field (PID1 field) including the PID number into the register REG1. In other words, if “00” is not confirmed as the PID number, no data is written in the register REG1.
[0141]
Similarly, the register control unit 110 writes the PID2 data in the PID2 field to the register REG2. The PID3 data in the PID3 field is written into the register REG3. The PID4 data in the PID4 field is written into the register REG4.
[0142]
The priority adding unit 112 determines which of PID1 data and PID2 data is given priority and which of PID3 data and PID4 data is given priority. That is, the priority adding unit 112 functions as a priority selection unit. In this embodiment, PID2 data and PID4 data are given priority. As shown in FIGS. 5 to 9, 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 field, PID2 field, PID3 field, and PID4 field are formed on the boundary extension line between the land track and the groove track. For this reason, the PID2 data in the PID2 field is reproduced relatively stably than the PID1 data in the PID1 field. Also, the PID4 data in the PID4 field is reproduced relatively stably than the PID3 data in the PID3 field. 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.
[0143]
Of course, PID1 data and PID3 data may be prioritized, PID1 data and PID4 data may be prioritized, or PID2 data and PID3 data may be prioritized.
[0144]
The priority adding unit 112 outputs a PID2 selection signal indicating selection of PID2 data to the selection unit SEL1. Furthermore, the priority adding unit 112 outputs a PID4 selection signal indicating selection of PID4 data to the selection unit SEL2.
[0145]
When PID1 data is written in the register REG1, the PID1 data is supplied from the register REG1 to the selection unit SEL1. Similarly, when PID2 data is written in the register REG2, the selection unit SEL1 is supplied with PID2 data from the register REG2. Further, a PID2 selection signal is supplied to the selection unit SEL1. If PID1 data and PID2 data are prepared in the selection unit SEL1, the selection unit SEL1 selects PID2 data according to the PID2 selection signal. When only PID1 data is prepared in the selection unit SEL1, the selection unit SEL1 selects PID1 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 supplied to the comparison unit 114 and the ID calculation unit 116.
[0146]
On the other hand, when PID3 data is written in the register REG3, the PID3 data is supplied from the register REG3 to the selection unit SEL2. Similarly, when PID4 data is written in the register REG4, PID4 data is supplied from the register REG4 to the selection unit SEL2. Further, a PID4 selection signal is supplied to the selection unit SEL2. If PID3 data and PID4 data are prepared in the selection unit SEL2, the selection unit SEL2 selects PID4 data according to the PID4 selection signal. When only PID3 data is prepared in the selection unit SEL2, the selection unit SEL2 selects PID3 data. That is, the selection unit SEL2 functions as priority selection means. The PID3 data or PID4 data selected by the selection unit SEL2 is supplied to the comparison unit 114 and the calculation unit 116.
[0147]
The comparison unit 114 includes a sector number included in the PID data (PID1 data or PID2 data) supplied from the selection unit SEL1, and a sector number included in the PID data (PID3 data or PID4 data) supplied from the selection unit SEL2. Compare 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 comparison unit 114 functions as an identification unit. Then, the comparison unit 114 supplies the identification result (land / groove) to the calculation unit 116.
[0148]
If (sector number included in PID data supplied from selection unit SEL1)> (sector number included in PID data supplied from selection unit SEL2), tracks following these PID data are identified as groove tracks. The Conversely, if (sector number included in PID data supplied from selection unit SEL1) <(sector number included in PID data supplied from selection unit SEL2), the track following these PID data is a land track. Identified as
[0149]
The calculation unit 116 calculates the sector number based on the comparison result (land / groove) supplied from the comparison unit 114. When the comparison result (land) is supplied from the comparison unit 114 to the calculation unit 116, the calculation unit 116 outputs the sector number included in the PID data supplied from the selection unit SEL1. That is, when the land track is identified, the sector number included in the PID1 data or PID2 data is output. When the comparison result (groove) is supplied from the comparison unit 114 to the calculation unit 116, the calculation unit 116 outputs the sector number included in the PID data supplied from the selection unit SEL2. That is, when a groove track is identified, the sector number included in the PID3 data or PID4 data is output.
[0150]
Here, the calculation of the sector number will be supplementarily described with reference to FIG.
[0151]
Assume that the header 1 field H12-1 or the header 2 field H12-2 is compared with the 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 included in the header 3 field H22-3 or the header 4 field H22-4.
[0152]
As another example, it is assumed that the header 1 field H32-1 or the header 2 field H32-2 is compared with the header 3 field H22-3 or the header 4 field H22-4. In this case, the size relationship is (sector number of header 1 field H32-1 or header 2 field H32-2) <(sector number of header 3 field H22-3 or header 4 field H22-4). Accordingly, the land sector L22 is identified as a land sector (land track). 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.
[0153]
According to the data reproduction 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, by comparing the sector number included in the PID1 field or the PID2 field with the sector number included in the PID3 field or the PID4 field, it is possible to identify whether the target track is a land track or a groove track from this comparison result. it can. This land / groove identification processing is performed based on reliable PID data in which an error is checked by IED data. Therefore, highly reliable identification processing is realized.
[0154]
Further, in the data reproduction circuit 38 shown in FIG. 14, the priority adding unit 112 determines which of PID1 data and PID2 data is given priority and which of PID3 data and PID4 data is given priority. At this time, by giving priority to PID2 and PID4, it becomes possible to realize a more reliable identification process.
[0155]
Next, details of header detection will be described.
[0156]
The register control unit 110 outputs the selection signal 00, the selection signal 01, the selection signal 10, or the selection signal 11 according to the PID data. That is, when the PID1 data is confirmed, the selection signal 00 is output. When the PID2 data is confirmed, a selection signal 01 is output. When the PID3 data is confirmed, a selection signal 10 is output. When the PID4 data is confirmed, the selection signal 11 is output.
[0157]
The selection signal 00, the selection signal 01, the selection signal 10, or the selection signal 11 output from the register control unit 110 is input to the selection unit SEL3. Data 1, data 2, data 3, and data 4 stored in the memory 122 are input to the selection unit SEL3. Data 1 is data used to generate a pseudo header signal that is output at the timing when the PID1 data is confirmed. Data 2 is data used to generate a pseudo header signal output at the timing when the PID2 data is confirmed. Data 3 is data used to generate a pseudo header signal output at the timing when the PID3 data is confirmed. Data 4 is data used to generate a pseudo header signal that is output at the timing when the PID4 data is confirmed.
[0158]
When the selection signal 00 is input to the selection unit SEL3, the selection unit 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.
[0159]
Data 1, data 2, data 3, or data 4 output from the selection unit SEL3 is input to a pseudo header generation unit 124 as a pseudo header signal output unit. In addition, the pseudo header generation unit 124 is provided with a counter 126. The counter 126 loads data 1, data 2, data 3, or data 4 input to the pseudo header generation unit 124. The counter 126 outputs a count value Nrs and a count value Ns at a predetermined timing according to the loaded data.
[0160]
The pseudo header signal generation unit 124 continues to output the pseudo header signal after the data is loaded into the counter 126 until the count value Nrs is output from the counter 126. Further, the pseudo header signal generator 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. Specifically, the pseudo header signal generation unit 124 outputs the selection signal 1 from the time when the counter 126 outputs the count value Ns to the time when the count value Nrs is output. Otherwise, a selection signal 0 is output.
[0161]
On the other hand, the header detection circuit 120 as the header signal output means outputs a header signal indicating that the header field has been detected. The reflected light of the light beam emitted to the header field has certain characteristics 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. The header signal output from the header detection circuit 120 is input to the OR circuit 128. That is, the OR circuit 128 receives the header signal output from the header detection circuit 120 and the pseudo header signal output from the pseudo header signal generation unit 126. Therefore, the logical sum circuit 128 outputs a logical sum signal of the header signal and the pseudo header signal.
[0162]
The selection unit SEL4 includes a logical sum signal output from the logical sum circuit 128, a pseudo header signal output from the pseudo header signal generation unit 124, and a selection signal 1 or a selection signal 2 output from the pseudo header signal generation unit 124. Is entered. When the selection signal 0 is input to the selection unit SEL4, the selection unit SEL4 selects and outputs a logical sum signal. When the selection signal 1 is input to the selection unit SEL4, the selection unit SEL4 selects and outputs a pseudo header signal. The logical sum signal or pseudo header signal output from the selection unit SEL4 is used for identifying the header field and the recording field.
[0163]
Next, the operation of the data reproduction circuit 38 shown in FIG. 14 will be described with reference to the timing chart of FIG.
[0164]
FIG. 15 is a timing chart showing how the header field HF1, the recording field RE1, the header field HF2, and the recording field RE2 are reproduced in order. The recording field RE1 is an area following the header field HF1. The header field HF2 is an area following the recording field RE1. The recording field RE2 is an area following the header field HF2.
[0165]
Assume 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 count value Ns is not output from the counter 124. Accordingly, the pseudo header signal generation unit 124 outputs the selection signal 0. Therefore, the selection signal 0 is supplied to the selection unit SEL4, and a logical sum signal is output from the selection unit SEL4. 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, the 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.
[0166]
For example, it is assumed that an address mark is detected from each of the header 2 field, the header 3 field, and the header 4 field without being detected from the header 1 field. That is, it is assumed that the header 1 field is not detected (header 1NG), but the header 2 field, header 3 field, and header 4 field are detected (header 2OK, header 3OK, header 4OK).
[0167]
Here, it is assumed that there is no error in PID2 by the error detection code IED recorded in the header 2 field (PID2OK). Accordingly, the selection signal 01 is output from the register control unit 110. Upon receiving the selection signal 01, the selection unit SEL3 selects and outputs data 2. This data 2 is input to the pseudo header signal generator 124 and loaded by the counter 126 (t2). The counter 126 is a count value Nrs (t6) according to the data 2. The count value Ns (t7) and the count value Nrs (t15) are output.
[0168]
Further, it is assumed that the error detection code IED recorded in the header 3 field confirms that there is no error in PID3 (PID3OK). Accordingly, the selection signal 10 is output from the register control unit 110. Upon receiving the selection signal 10, the selection unit SEL3 selects and outputs data 3. This data 3 is input to the pseudo header signal generator 124 and loaded by the counter 126 (t3). The counter 126 is a count value Nrs (t6) according to the data 3. The count value Ns (t7) and the count value Nrs (t15) are output.
[0169]
Furthermore, it is assumed that the error detection code IED recorded in the header 4 field confirms that there is no error in PID4 (PID4OK). Accordingly, the selection signal 11 is output from the register control unit 110. Upon receiving the selection signal 11, the selection unit SEL3 selects and outputs 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 is a count value Nrs (t6) according to the data 3. The count value Ns (t7) and the count value Nrs (t15) are output.
[0170]
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, regardless of which data of data 1, data 2, data 3, and data 4 is loaded by the counter 126, the count value Nrs is output at timings t6 and t15, and the count value Ns is output at timing t7. . More specifically, data 1, 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. The data is such that Nrs is output. Data 1, data 2, data 3, and data 4 are data that cause the counter 126 to output the count value Ns at the timing when the buffer field of the recording field RE1 is reproduced.
[0171]
The pseudo header signal generator 124 starts outputting the pseudo header signal at the timing when the data 126 is loaded by the counter 126 (t2), and until the counter value Nrs is output from the counter 126 (t6), The output is continued (t2 to t6). 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 until the counter value Nrs is output from the counter 126 (t6), The signal output 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 (t4), and until the counter value Nrs is output from the counter 126 (t6). The signal output is continued (t4 to t6).
[0172]
As a result, the pseudo header signal is output (t6) from when the data 2 is loaded by the counter 126 (t2) until the counter value Nrs is output from the counter 126. During this time, the pseudo header signal generator 126 outputs the selection signal 0. Therefore, the selection unit SEL4 selects and outputs the logical sum signal that is the output of the logical sum circuit 128.
[0173]
The pseudo header signal generation unit 124 starts outputting the pseudo header signal at the timing when the counter value Ns is output from the counter 126 (t7), and until the counter value Nrs is output from the counter 126 (t15). Continue outputting the header signal (t7 to t15). Furthermore, 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 continues until the counter value Nrs is output from the counter 126 (t15). The output of signal 1 is continued (t7 to t15). Therefore, the selection unit SEL4 selects and outputs the pseudo header signal.
[0174]
On the other hand, it is assumed that a part of the header field HF2 is detected by the header detection circuit and a header signal is output from the header detection circuit 120 (t10 to t14). Incidentally, t8 to t10 indicate that the header signal is missing. According to the present invention, even if a part of the header signal is missing (t8 to t10), the header field HF2 and the recording field RE2 are accurately identified by relying on the pseudo header signal (t7 to t15), The recording field RE2 can be normally played back. The timing chart of FIG. 15 indicates that all PID data in the header field HF2 has been successfully reproduced using the pseudo header signal (t7 to t15) (PID1OK, PID2OK, PID3OK, 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, t13). As a result, the count value Nrs and the count value Ns are output from the counter 126 at a predetermined timing.
[0175]
In general, data reproduction at the boundary between the header field and the recording field, that is, at the boundary between the embossed recording field and the phase change recording field tends to be unstable. For this reason, the pseudo header signal starts to be output and ends after avoiding the boundary between the header field and the recording field. Specifically, it is output from the buffer field of the recording field RE1 to the VFO3 field of the recording field RE2 (in the case of a pseudo header signal output with the output of the count value Ns). Thereby, the recording field can be further stably reproduced.
[0176]
Assume that the header 1 field, header 2 field, header 3 field, and header 4 field are not detected from the header field HF2. That is, it is assumed that no PID data is 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]
【The invention's effect】
According to the present invention, it is possible 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 detection of an unstable header field. .
[Brief description of the drawings]
FIG. 1 is a diagram for explaining a concept of a zone of an optical disc.
FIG. 2 is a diagram for explaining the outline of the data structure of an optical disc.
FIG. 3 is a diagram for explaining the rotational 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 groove sector or between a land sector and 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 for explaining 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 disc apparatus.
FIG. 14 is a diagram showing a schematic configuration of a data reproduction circuit of the optical disc apparatus.
FIG. 15 is a timing chart illustrating the operation of the data reproduction circuit.
[Explanation of symbols]
1 ... Optical disc
5 ... Optical head
10 ... Memory
38. Data reproduction circuit
35 ... Laser drive circuit
39 ... Semiconductor laser
50 ... CPU
100 ... PLL circuit
102 ... AM detector
104: Timing generator
106: S / P converter
108 ... 8/16 modulator
110: Register control unit
114 ... Comparison part
116: Calculation unit
120 ... Header detection circuit
122 ... Memory
124: pseudo header signal generation unit
126 ... Counter
128: OR circuit
SEL1, SEL2, SEL3, SEL4 ... selection unit

Claims (16)

The first header data including the first identification data indicating the first header data, and the data substantially the same as the first header data and indicating the second header data A header area in which the second header data including the second identification data is recorded, and a data recording based on the first and second header data recorded in the header area, the area following the header area. Alternatively, in an optical disk apparatus for reproducing various data including the header data from an optical disk having a data recording area to be reproduced,
Reproducing means for reproducing the first and second header data from the optical disc;
When the reproduction means reproduces the first identification data included in the first header data, a first pseudo-data indicating that the header area has been detected in a pseudo manner based on the first identification data. A header signal is output at a first timing, and the first identification data included in the first header data is not reproduced by the reproduction means, and the second identification included in the second header data is not reproduced. When the data is reproduced, based on the second identification data, a pseudo header signal output means for outputting a second pseudo header signal indicating that the header area is detected in a pseudo manner at a second timing;
An optical disc apparatus comprising: The first header data including the first identification data indicating the first header data, and the data substantially the same as the first header data and indicating the second header data A header area in which the second header data including the second identification data is recorded, and a data recording based on the first and second header data recorded in the header area, the area following the header area. Alternatively, in an optical disk apparatus for reproducing various data including the header data from an optical disk having a data recording area to be reproduced,
First reproducing means for reproducing the first and second header data from the optical disc;
When the first reproducing means reproduces the first identification data included in the first header data, the first reproducing means indicates that the header area is detected in a pseudo manner based on the first identification data. 1 pseudo header signal is output at a first timing, and the first identification data included in the first header data is not reproduced by the first reproduction means but is included in the second header data. When the second identification data to be reproduced is reproduced, a pseudo header that outputs, at a second timing, a second pseudo header signal indicating that the header area is detected in a pseudo manner based on the second identification data Signal output means;
Second reproducing means for reproducing the data recorded in the data recording area based on one of the first and second pseudo header signals output from the pseudo header signal output means. When,
An optical disc apparatus comprising: The first header data including the first identification data indicating the first header data, and the data substantially the same as the first header data and indicating the second header data A header area in which the second header data including the second identification data is recorded, and a data recording based on the first and second header data recorded in the header area, the area following the header area. Alternatively, in an optical disk apparatus for reproducing various data including the header data from an optical disk having a data recording area to be reproduced,
Reproducing means for reproducing the first and second header data from the optical disc;
When the reproduction means reproduces the first identification data included in the first header data, the first pseudo data indicating that the header area is detected in a pseudo manner based on the first identification data. A header signal is output at a first timing, and the first identification data included in the first header data is not reproduced by the reproduction means, and the second identification included in the second header data is not reproduced. when data is reproduced, based on the second identification data, and the pseudo header signal output means for outputting a second pseudo header signal indicating the detection of the pseudo the header area with a second timing,
Recording means for recording data in the data recording area based on one of the first and second pseudo header signals output by the pseudo header signal output means;
An optical disc apparatus comprising: Including the header data from an optical disc having a header area in which header data is recorded, and a data recording area that is subsequent to the header area and receives or records data based on the header data recorded in the header area In an optical disc device for reproducing various data,
First reproducing means for reproducing the header data from the optical disc;
Header signal output means for outputting a header signal indicating that the header area has been detected based on the header data reproduced by the first reproduction means;
Pseudo header signal output means for outputting a pseudo header signal indicating that the header area is detected in a pseudo manner based on predetermined data included in the header data reproduced by the first reproduction means at a predetermined timing; ,
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, the header area and the data recording area are identified and recorded in the data recording area. Second reproducing means for reproducing the recorded data;
An optical disc apparatus comprising: Including the header data from an optical disc having a header area in which header data is recorded, and a data recording area that is subsequent to the header area and receives or records data based on the header data recorded in the header area In an optical disc device for reproducing various data,
Reproducing means for reproducing the header data from the optical disc;
Header signal output means for outputting a header signal indicating that the header area is detected based on the header data reproduced by the reproduction means;
A pseudo header signal output means for outputting 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 means;
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, the header area and the data recording area are identified, and the data recording area A recording means for recording data;
An optical disc apparatus comprising: The first header data including the first identification data indicating the first header data, and the data substantially the same as the first header data and indicating the second header data A header area in which the second header data including the second identification data is recorded, and a data recording based on the first and second header data recorded in the header area, the area following the header area. Alternatively, in an optical disk apparatus for reproducing various data including the header data from an optical disk having a data recording area to be reproduced,
First reproducing means for reproducing the first and second header data from the optical disc;
Header signal output means for outputting a header signal indicating that the header area is detected based on the first and second header data reproduced by the first reproduction means;
When the first identification data included in the first header data is reproduced by the first reproduction means, the first identification data indicates that the header area is detected in a pseudo manner based on the first identification data. 1 pseudo header signal is output at a first timing, and the first identification data included in the first header data is not reproduced by the first reproduction means but is included in the second header data. When the second identification data to be reproduced is reproduced , a pseudo header that outputs, at a second timing, a second pseudo header signal indicating that the header area is detected in a pseudo manner based on the second identification data Signal output means;
Based on one of the header signal output by the header signal output means and the pseudo header signal of the first and second pseudo header signals output by the pseudo header signal output means, the header region And a second reproducing means for identifying the data recording area and reproducing the data recorded in the data recording area;
An optical disc apparatus comprising: The first header data including the first identification data indicating the first header data, and the data substantially the same as the first header data and indicating the second header data A header area in which the second header data including the second identification data is recorded, and a data recording based on the first and second header data recorded in the header area, the area following the header area. Alternatively, in an optical disk apparatus for reproducing various data including the header data from an optical disk having a data recording area to be reproduced,
Reproducing means for reproducing the first and second header data from the optical disc;
Header signal output means for 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;
When the first identification data included in the first header data is reproduced by the reproduction means, a first pseudo value indicating that the header area has been detected in a pseudo manner based on the first identification data. A header signal is output at a first timing, and the second identification included in the second header data is not reproduced by the reproducing means without reproducing the first identification data included in the first header data. When the data is reproduced, based on the second identification data, a pseudo header signal output means for outputting a second pseudo header signal indicating that the header area is detected in a pseudo manner at a second timing;
Based on one of the header signal output by the header signal output means and the pseudo header signal of the first and second pseudo header signals output by the pseudo header signal output means, the header region And a recording means for identifying the data recording area and recording data in the data recording area,
An optical disc apparatus comprising: The pseudo header signal output means is
The first pseudo header signal is output from the time when the first identification data included in the first header data is reproduced until the synchronization code recorded in the data recording area is reproduced. 1 output means;
The second pseudo header signal is output from the time when the second identification data included in the second header data is reproduced until the synchronization code recorded in the data recording area is reproduced. Two output means;
The optical disc apparatus according to claim 2, claim 3, claim 6, or claim 7 . The first header data including the first identification data indicating the first header data, and the data substantially the same as the first header data and indicating the second header data A first header area in which second header data including second identification data is recorded, an area following the first header area, and data recording or reproduction based on the first or second header data Receiving the first data recording area, the third header data including the third identification data indicating the third header data, which is an area following the first data recording area, and the third data A second header area in which fourth header data including fourth identification data indicating substantially the same data as the header data and the fourth header data is recorded, and the second header Territory Wherein a subsequent area to the third or fourth said first from the optical disk having a second data recording area to be recorded or reproduced data based on the header data of the second, third, and fourth header data In an optical disc apparatus for reproducing various data including
Reproducing means for reproducing the first, second, third, and fourth header data from the optical disc;
When the reproducing means reproduces the first identification data included in the first header data, a first indicating that the first header area has been detected in a pseudo manner based on the first identification data. 1 pseudo header signal is output at a first timing, and a second pseudo header signal indicating that the second header area is detected in a pseudo manner is output at a second timing. 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, based on the second identification data, A third pseudo header signal indicating that the first header area has been detected in a pseudo manner is output at a third timing, and the second header area has been detected in a pseudo manner. And the pseudo header signal output means for outputting the second pseudo header signal at the second timing,
An optical disc apparatus comprising: The first header data including the first identification data indicating the first header data, and the data substantially the same as the first header data and indicating the second header data A first header area in which second header data including second identification data is recorded, an area following the first header area, and data recording or reproduction based on the first or second header data Receiving the first data recording area, the third header data including the third identification data indicating the third header data, which is an area following the first data recording area, and the third data A second header area in which fourth header data including fourth identification data indicating substantially the same data as the header data and the fourth header data is recorded, and the second header Territory The first, second, third, and fourth header data from an optical disc that has a second data recording area that follows the third or fourth header data and receives data recording or reproduction based on the third or fourth header data In an optical disc apparatus for reproducing various data including
First reproducing means for reproducing the first, second, third, and fourth header data from the optical disc;
When the first identification data included in the first header data is reproduced by the first reproduction means, the first header area is detected in a pseudo manner based on the first identification data. A first pseudo header signal indicating that the second header area is detected in a pseudo manner is output at a second timing, and a second pseudo header signal indicating that the second header area is detected is output at a second timing. 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 one reproduction unit, the second identification data is reproduced. Based on the identification data, a third pseudo header signal indicating that the first header area has been detected in a pseudo manner is output at a third timing, and the second header area is detected in a pseudo manner. And the pseudo header signal output means for outputting at the second timing said second pseudo header signal indicating that the,
Based on one of the first and third pseudo header signals output by the pseudo header signal output means, the data recorded in the first data recording area is reproduced, Second reproducing means for reproducing data recorded in the second data recording area based on a second pseudo header signal;
An optical disc apparatus comprising: The first header data including the first identification data indicating the first header data, and the data substantially the same as the first header data and indicating the second header data first header region where the second header data including the second identification data is recorded, the recording or the data based on the first said an area following the header area of the first or second header data The first data recording area to be reproduced, the third header data including the third identification data indicating the area following the first data recording area and the third header data, and the third data The second header area in which the fourth header data including the fourth identification data indicating the fourth header data is substantially the same as the header data of the first header data, and the second header data Header area The first, second, third, and fourth header data from an optical disc that has a second data recording area that follows the third or fourth header data and receives data recording or reproduction based on the third or fourth header data In an optical disc apparatus for reproducing various data including
Reproducing means for reproducing the first, second, third, and fourth header data from the optical disc;
When the reproducing means reproduces the first identification data included in the first header data, a first indicating that the first header area has been detected in a pseudo manner based on the first identification data. 1 pseudo header signal is output at a first timing, and a second pseudo header signal indicating that the second header area is detected in a pseudo manner is output at a second timing. 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, based on the second identification data, A third pseudo header signal indicating that the first header area has been detected in a pseudo manner is output at a third timing, and the second header area has been detected in a pseudo manner. And the pseudo header signal output means for outputting the second pseudo header signal at the second timing,
Based on the pseudo header signal of one of the first and third pseudo header signals output by the pseudo header signal output means, data is recorded in the first data recording area, and the first Recording means for recording data in the second data recording area based on two pseudo header signals;
An optical disc apparatus comprising: A first header area in which first header data is recorded, a first data recording area that is subsequent to the first header area and receives data recording or reproduction based on the first header data; A second header area in which the second header data is recorded and an area following the first data recording area; and an area following the second header area and based on the second header data In an optical disc apparatus for reproducing various data including the first and second header data from an optical disc having a second data recording area to be recorded or reproduced,
First reproducing means for reproducing the first and second header data from the optical disc;
A first header signal indicating that the first header area has been detected is output based on the first header data reproduced by the first reproduction means, and the second header data is output based on the second header data. Header signal output means for outputting a second header signal indicating that the header area is detected;
A first pseudo header signal indicating that the first header area is detected in a pseudo manner based on predetermined data included in the first header data reproduced by the first reproduction means; and a pseudo Pseudo header signal output means for outputting a second pseudo header signal indicating that the second header area has been detected at a predetermined timing,
Based on the first header signal output by the header signal output means and the first pseudo header signal output by the pseudo header signal output means, the first header area and the first data recording An area is identified, data recorded in the first data recording area is reproduced, and based on the second pseudo header signal output by the pseudo header signal output means, the second header area and the second data A second reproducing means for identifying two data recording areas and reproducing the data recorded in the second data recording area;
An optical disc apparatus comprising: A first header area in which first header data is recorded, a first data recording area that is subsequent to the first header area and receives data recording or reproduction based on the first header data; A second header area in which the second header data is recorded and an area following the first data recording area; and an area following the second header area and based on the second header data In an optical disc apparatus for reproducing various data including the first and second header data from an optical disc having a second data recording area to be recorded or reproduced,
Reproducing means for reproducing the first and second header data from the optical disc;
A first header signal indicating that the first header area is detected based on the first header data reproduced by the reproducing means is output, and the second header area is based on the second header data. Header signal output means for outputting a second header signal indicating that the
Based on predetermined data included in the first header data reproduced by the reproduction means, a first pseudo header signal indicating that the first header area has been detected in a pseudo manner, and the first Pseudo header signal output means for outputting a second pseudo header signal indicating that the header area of 2 has been detected, respectively, at a predetermined timing;
Based on the first header signal output by the header signal output means and the first pseudo header signal output by the pseudo header signal output means, the first header area and the first data recording An area is identified, data is recorded in the first data recording area, and based on the second pseudo header signal output by the pseudo header signal output means, the second header area and the second Recording means for identifying the data recording area and recording data in the second data recording area;
An optical disc apparatus comprising: The first header data including the first identification data indicating the first header data, and the data substantially the same as the first header data and indicating the second header data A first header area in which second header data including second identification data is recorded, an area following the first header area, and data recording or reproduction based on the first or second header data Receiving the first data recording area, the third header data including the third identification data indicating the third header data, which is an area following the first data recording area, and the third data A second header area in which fourth header data including fourth identification data indicating substantially the same data as the header data and the fourth header data is recorded, and the second header Territory The first, second, third, and fourth header data from an optical disc that has a second data recording area that follows the third or fourth header data and receives data recording or reproduction based on the third or fourth header data In an optical disc apparatus for reproducing various data including
First reproducing means for reproducing the first, second, third, and fourth header data from the optical disc;
Based on the first or second header data reproduced by the first reproduction means, a first header signal indicating that the first header area is detected is output, and the third or fourth header is output. Header signal output means for outputting a second header signal indicating that the second header area is detected based on data;
When the first identification data included in the first header data is reproduced by the first reproduction means, the first header area is detected in a pseudo manner based on the first identification data. And a second pseudo header signal indicating that the second header area is detected in a pseudo manner is output at a second timing, and 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 one reproduction unit, the second identification data is reproduced. Based on the identification data, a third pseudo header signal indicating that the first header area has been detected in a pseudo manner is output at a third timing, and the second header area is detected in a pseudo manner. And the pseudo header signal output means for outputting at the second timing said second pseudo header signal indicating that the,
Based on one of the first header signal output by the header signal output means and the first and third pseudo header signals output by the pseudo header signal output means, Identifying the first header 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 a second reproducing means for identifying the second data recording area and reproducing the data recorded in the second data recording area;
An optical disc apparatus comprising: The first header data including the first identification data indicating the first header data, and the data substantially the same as the first header data and indicating the second header data A first header area in which second header data including second identification data is recorded, an area following the first header area, and data recording or reproduction based on the first or second header data Receiving the first data recording area, the third header data including the third identification data indicating the third header data, which is an area following the first data recording area, and the third data A second header area in which fourth header data including fourth identification data indicating substantially the same data as the header data and the fourth header data is recorded, and the second header Territory The first, second, third, and fourth header data from an optical disc that has a second data recording area that follows the third or fourth header data and receives data recording or reproduction based on the third or fourth header data In an optical disc apparatus for reproducing various data including
Reproducing means for reproducing the first, second, third, and fourth header data from the optical disc;
A first header signal indicating that the first header area has been detected is output based on the first or second header data reproduced by the reproducing means, and based on the third or fourth header data. Header signal output means for outputting a second header signal indicating that the second header area has been detected;
When the reproduction means reproduces the first identification data included in the first header data, it indicates that the first header area is detected in a pseudo manner based on the first identification data. 1 pseudo header signal is output at a first timing, and a second pseudo header signal indicating that the second header area is detected in a pseudo manner is output at a second timing. 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, based on the second identification data, A third pseudo header signal indicating that the first header area has been detected in a pseudo manner is output at a third timing, and the second header area has been detected in a pseudo manner. And the pseudo header signal output means for outputting the second pseudo header signal at the second timing,
Based on one of the first header signal output by the header signal output means and the pseudo header signal of the first and third pseudo header signals output by the pseudo header signal output means, Identifying the first header area and the first data recording area, recording data in the first data recording area, and based on the second pseudo header signal, the second header area and A recording means for identifying the second data recording area and recording data in the second data recording area;
An optical disc apparatus comprising: The pseudo header signal output means is
From the time when the first identification data included in the first header data is reproduced to the time when the synchronization code recorded in the first data recording area is reproduced, the first pseudo header signal is First output means for outputting;
The synchronization code recorded in the second data recording area after the predetermined area of the first data recording area corresponding to the boundary between the first data recording area and the second header area is reproduced. Until the second is reproduced, second output means for outputting the second pseudo header signal;
From the time when the second identification data included in the second header data is reproduced to the time when the synchronization code recorded in the first data recording area is reproduced, the third pseudo header signal is Third output means for outputting;
The optical disc apparatus according to claim 10, claim 11, claim 14, or claim 15 .

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