JP3486165B2 - Information recording medium, information recording device, information recording method, information reproducing device, and information reproducing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium such as an optical disk capable of recording and reproducing data.

The present invention also relates to an information recording apparatus and an information recording method for recording information on the above information recording medium.

Further, the present invention relates to an information reproducing apparatus and an information reproducing method for reproducing the information recorded on the above-mentioned information recording medium.

[0004]

2. Description of the Related Art As one of information recording media, for example, a phase change type rewritable optical disk is known. When a light beam is focused and irradiated on such an optical disc,
A phase change mark is formed on the disk as the light intensity of the light beam changes. That is, the target data can be recorded on the disc by controlling the light beam applied to the disc in accordance with the target recording data.

Even when data is reproduced from such an optical disk, a light beam is focused and irradiated onto the optical disk. However, compared to the laser power of the light beam during recording,
A light beam having a laser power lower by a predetermined level is used.
When the disc is irradiated with the light beam, the reflected light from the disc can be obtained accordingly. The reflected light contains components of the phase change mark formed on the disc. That is, by detecting this reflected light, the target data recorded as the phase change mark on the disc can be reproduced.

Next, the standards of DVD-RAM and embossed pits and their advantages will be described. As described above, a rewritable optical disc is known which can repeatedly record data at an arbitrary position and reproduce data at an arbitrary position. As one of the optical disks, for example, a rewritable optical disk (ISO / IEC16824) called a DVD-RAM having an internationally standardized diameter of 120 mm is used.
There is. In this DVD-RAM, a groove groove meandering for tracking (hereinafter, this meandering is called a wobble) and a flat portion called a land are formed, and data is recorded in both the groove groove and the flat portion.

Address data is recorded in advance on this optical disk for each sector (physical sector).
The address data is recorded by embossed pits called CAPA. This optical disk is divided into a plurality of zones in the radial direction, and the rotation of each zone is controlled at a constant rotation speed. That is, the ZCLV method is adopted for the rotation control. In this method, the number of sectors per track in a zone is equal. Comparing a certain zone with one of the zones on the outer peripheral side of this zone, from the number of sectors per track in a certain zone,
There is one more sector per track in the outer peripheral zone. In the same zone, C
APAs are radially aligned. As a result, since the embossed pits are not arranged in the radial direction of the area in which the target data is recorded, it is possible to prevent the recording / reproduction from becoming unstable due to the influence of the embossed pits. However, when the zone changes (crosses the zone), the CAPs aligned in the radial direction
A also breaks. The width of the zone is determined in terms of CAPA alignment and format efficiency. For example, the width of one zone is a range in which the number of sectors per track does not increase.

In the DVD-RAM, since the physical address is determined on a sector-by-sector basis as described above, it is possible to record at any address on the disk, and it is also possible to record data suddenly without initialization.

Next, the dual recording layer will be described. As a method of improving the recording capacity of one optical disk, a method of stacking two recording layers can be considered. This follows the single-sided, double-layer method adopted in the DVD-ROM, which is a read-only optical disc. Data is recorded on a target recording layer by irradiating light from the same side on a disc manufactured by separating two recording layers with a transparent layer and focusing on one of the target recording layers. Can be recorded and the data recorded in the target recording layer can be reproduced.

[0010]

The problem of forming the recording layer into two layers will now be described. In the two-layer type disc, when the recording layer on the back side is viewed from the incident direction of the light beam, the light beam for the recording and reproduction passes through the recording layer on the front side. When the recording layer on the front side is a ROM type recording layer, data is recorded in advance by embossed pits on the entire surface of the optical disc. Therefore, the transmittance and reflectance of the recording layer on the front side through which the incident light to the recording layer on the back side and the reflected light from the recording layer on the back side are transmitted are
It is almost constant over the entire disc. On the other hand, D
In a rewritable disc such as a VD-RAM (when the recording layer on the front side is a RAM type recording layer),
There are an embossed area in which data is recorded by embossed pits, a phase change recording area in which data is recorded by phase change, and the like, and the transmittance and the reflectance are different in both areas. Further, also in the phase change recording area, the transmittance and the reflectance are different between the amorphous state area (recorded area) and the crystalline state (unrecorded area). Due to such a difference, the following problems occur.

1. When the recorded area and the unrecorded area are mixed in the front recording layer, the intensity of the recording light transmitted through the front recording layer and reaching the back recording layer is the recorded area and the unrecorded area. Therefore, the recording light causes unevenness of the inter-recording marks formed on the back side recording layer, and the recording stability is impaired.

2. When a recorded area and an unrecorded area are mixed in the front recording layer, the light passes through the front recording layer to reach the back recording layer, is reflected by the back recording layer, and is again front recording. Since the intensity of the reproduction light transmitted through the layer varies between the recorded area and the unrecorded area, an error is likely to occur in the reproduction signal. Furthermore, since the reproduced signal is offset due to the change in the reflectance of the recording layer on the front side, the reproduction stability is impaired.

An area in which embossed pits such as CAPA of DVD-RAM are recorded is an information recording prohibited area and is always in an unrecorded state. Further, the area where the shape of the substrate is CAPA is embossed, and the optical condition such as light scattering is different from the recording area where the groove is formed. That is, the transmittance is also different. Furthermore, in the case of DVD-RAM,
Since the CAPA area is arranged in sector units, even the smallest innermost zone has 2 tracks per track.
There are 5 places, and 59 places per lap in the outermost zone. When the recording layers having such a structure are bonded to each other to form a two-layer structure, the recording / reproducing stability is impaired.

Next, CAP for format efficiency
The problem in A will be described. In the method of recording address data by embossed pits on a sector-by-sector basis like a DVD-RAM, an address data field (header field), a buffer field, a guard field, etc. are required for each sector. The buffer field is a field for coping with the actual change in the sector length on the disk caused by the rotational fluctuation of the disk or the eccentricity during the rotation. The guard field is a field for coping with the random shift of the recording position and the deterioration of the beginning and end due to recording. As described above, the DVD-RAM requires various fields in addition to the fields for recording the target data. This is the DVD-R
This is a cause of the AM format efficiency being significantly reduced as compared with the DVD-ROM. Specifically, the recording capacity of the DVD-RAM is about 10% smaller than that of the DVD-ROM.

Next, CAPA for seamless recording
Described below are the problems. In the DVD-RAM, the width of the zone is large in order to align CAPA, and the recording frequency jumps greatly between the zones.
For this reason, if a large amount of data such as video data is to be recorded continuously, it takes time to switch the recording frequency for each zone. This causes problems such as a decrease in transfer rate and difficulty in seamless recording.

Next, the necessity and problems of the training pattern will be described. With the increase in recording density of optical discs and the increase in NA of lenses, deterioration of reproduced signals due to influences of crosstalk between adjacent tracks, intersymbol interference, disc tilt, etc. cannot be ignored.
On the other hand, there is a method of determining the condition of waveform equalization and complementing the deterioration of the reproduced signal by reproducing the training pattern which is the known array data on the disc. Further, there is a method of measuring the tilt of the disc by utilizing this condition and the reproduction information itself of the known data. In these methods, it is necessary to record the training pattern on the disc in advance. However, inserting this training pattern in a part of the recording field causes a decrease in storage capacity. Further, when the training pattern is arranged in the recording field, it becomes difficult to specify the position of the training pattern at the time of recording / reproducing, and it may hinder continuous recording.

The present invention has been made in view of the above circumstances, and provides the following information recording medium, information recording apparatus, information recording method, information reproducing apparatus, and information reproducing method. It is in.

(1) An information recording medium having a plurality of recording layers on one side and capable of highly accurate recording and reproduction in any of the recording layers.

(2) An information recording medium having excellent recording efficiency, particularly for seamless recording of a large amount of continuous data such as video data, and recording of small data in ECC block units such as PC data at an arbitrary position. Excellent information recording medium.

(3) Information is recorded on an information recording medium having a plurality of recording layers on one side and capable of highly accurate recording and reproduction on any recording layer so that the characteristics of the information recording medium can be exhibited. Information recording apparatus and information recording method.

(4) An information recording medium having excellent recording efficiency, particularly for seamless recording of a large amount of continuous data such as video data, and recording of small data of an ECC block unit such as PC data at an arbitrary position. An information recording apparatus and an information recording method for recording information on an excellent information recording medium so that the characteristics of the information recording medium can be exhibited.

(5) An information reproducing apparatus and an information reproducing method for reproducing data recorded on an information recording medium having a plurality of recording layers on one side and capable of recording and reproducing with high accuracy in any recording layer.

(6) An information recording medium having excellent recording efficiency, particularly for seamless recording of a large amount of continuous data such as video data, and recording of small data in ECC block units such as PC data at an arbitrary position. An information reproducing apparatus and an information reproducing method for reproducing data recorded on an excellent information recording medium.

[0024]

In order to solve the above problems and achieve the object, an information recording medium, an information recording apparatus, an information recording method, an information reproducing apparatus, and an information reproducing method of the present invention are as follows. It is configured.

(1) A disk-shaped information recording medium having a plurality of laminated recording layers, each recording layer blocking a spiral track composed of a plurality of turns and a part of the spiral track. At least one index header aligned in the radial direction of the disc, the index header having address data of each track recorded by embossed pits, and the index header of each recording layer is a light beam. Are arranged so as to overlap with each other within a predetermined range when viewed from the incident surface.

(2) A disc-shaped information recording medium having a plurality of laminated recording layers, each recording layer blocking a spiral track composed of a plurality of turns and a part of the spiral track. At least one index header aligned in the radial direction of the disc, the index header having address data of each track recorded by embossed pits, and the index header of each recording layer is a light beam. The information recording device, which is arranged so as to overlap in a predetermined range when viewed from the incident surface of, records data on the information recording medium, irradiates a light beam from one surface of the information recording medium, and The recording means for recording data on the spiral track provided on the recording layer of 1.

(3) A disc-shaped information recording medium having a plurality of laminated recording layers, each recording layer blocking a spiral track composed of a plurality of turns and a part of the spiral track. At least one index header aligned in the radial direction of the disc, the index header having address data of each track recorded by embossed pits, and the index header of each recording layer is a light beam. The information recording method for recording data on the information recording medium is arranged so as to overlap each other within a predetermined range when viewed from the incident surface of the optical recording medium. The data is recorded on the spiral track provided on the recording layer.

(4) A disk-shaped information recording medium having a plurality of laminated recording layers, each recording layer blocking a spiral track composed of a plurality of turns and a part of the spiral track. At least one index header aligned in the radial direction of the disc, the index header having address data of each track recorded by embossed pits, and the index header of each recording layer is a light beam. The information reproducing apparatus for reproducing data from the information recording medium is arranged so as to overlap in a predetermined range when viewed from the incident surface of the information recording medium. It is characterized by having a reproducing means for reproducing data from spiral tracks provided in the layers.

(5) A disk-shaped information recording medium having a plurality of laminated recording layers, each recording layer blocking a spiral track composed of a plurality of turns and a part of the spiral track. At least one index header aligned in the radial direction of the disc, the index header having address data of each track recorded by embossed pits, and the index header of each recording layer is a light beam. The information reproducing method for reproducing data from the information recording medium is arranged so as to overlap each other within a predetermined range when viewed from the incident surface of the information recording medium. It is characterized in that data is reproduced from spiral tracks provided in the layers.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a schematic structure of an optical disc (information recording medium) according to an example of the present invention. The optical disc 10 has a plurality of stacked recording layers. The optical disc 10 has data recorded on a spiral track provided on a target recording layer arbitrarily selected by a light beam emitted from one surface thereof, or on a spiral track provided on the target recording layer. The recorded data is played back.

FIG. 2 is a cross-sectional view of the optical disc in which the dummy area 201 is not arranged, which is cut open along the track across the index header. Figure 3
Is the second recording layer 215 in the optical disc shown in FIG.
FIG. 6 is a diagram showing a change in light transmittance of the first recording layer 214 when a light beam is scanned along a track in a state of being focused on. FIG. 4 shows the optical disc 10 shown in FIG.
FIG. 6B is a cross-sectional view of when is cut open along the track straddling the index header, and is a view showing the arrangement of dummy regions 201. FIG. 5 shows the optical disc 10 of FIG.
FIG. 8 is a diagram showing an arrangement when a light beam is scanned along a track in a state where the second recording layer 215 is focused, and a light transmittance change of the first recording layer 214. FIG. 6 is a diagram showing another example of the dummy area. FIG. 7 is a diagram showing the structure of the spiral track. FIG. 8 is a diagram showing the structure of the index header 12. FIG. 9 is a diagram showing the structure of the recording field 15. FIG. 11 is a diagram showing the relationship between the recording field 15 and the sub recording field.

First, the outline of the double-layer disc and the principle of recording / reproducing will be described.

The optical disc shown in FIG. 1 is a DVD-RAM.
It has a single-sided two-layer structure in which two phase-change recording films, which are the same as the above, are laminated. A transparent intermediate layer 212 is inserted between the lower first recording layer 214 and the upper second recording layer 215. Irradiation light 222 is radiated from the lower side to such an optical disc, and the first recording layer 214 or the second recording layer 2 is irradiated.
It is condensed by the objective lens on one of the recording layers arbitrarily selected from 15. When the selected recording layer is irradiated with a strong laser beam in a pulsed manner, a portion having a high light intensity is made amorphous, and the other portion is crystallized to write desired data. At this time, if the second recording layer 215 is in focus, the spot 223 on the first recording layer 214 is defocused and the energy density is low.
In 4, the optical and thermal effects are negligible. The second recording layer 21 when the first recording layer 214 is in focus
The effect on 5 is also the same. However, as described repeatedly, when the second recording layer 215 is in focus, the change in the transmittance of the first recording layer 214 has a great influence on recording and reproduction on the second recording layer 215. . Further, the change in the reflectance of the first recording layer 214 affects the offset of the reproduction signal of the second recording layer 215.

Next, the structure of each recording layer will be described.

As shown in FIG. 1, each recording layer includes a lead-in area 203, a lead-out area 204, an additional information recording / rewriting recording area (hereinafter referred to as an information recording area),
The index header 12 and the dummy area 201 are provided. The information recording area is a groove-shaped groove track 1
3 and land-shaped land tracks 14 are provided with spiral tracks (recording tracks) which are alternately switched for each turn. The index header 12 is aligned in the disk radial direction so as to block this spiral track. One or both sides of the index header 12 and the embossed pit area 2 of the lead-in area
The dummy area 201 is arranged outside the area 02 and outside the lead-out area 204. This dummy area 20
1 is used for adjusting the transmittance and the reflectance and for prohibiting recording, and the range is determined by the positioning accuracy when laminating the disks, the divergence angle of the beam spot, and the like.

Next, details of the wobble will be described.

The spiral track is wobbled by a wobble signal. Further, the recording layer of the optical disc defines a plurality of zones on the donut having different diameters from the inner circumference side to the outer circumference side. Each of these zones includes a predetermined number of turns of tracks. The number of wobbles per one track included in the predetermined zone is determined to be constant. When reproducing an optical disk, the information reflected in the reflected light is reproduced by irradiating the light beam along the track and detecting the reflected light from the track as described above. At this time, the reflected light contains a wobble component in addition to the information such as the recording mark.
In other words, by detecting the wobble component contained in this reflected light,
It can be taken out as a wobble signal. Further, a rotation control signal of the spindle motor and a clock signal used when recording data can be obtained from the extracted wobble signal. As a result, accurate recording can be performed without being affected by the rotation fluctuation of the motor.

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

The spiral track of this optical disc is of a land-and-groove recording system suitable for high-density recording and capable of recording data on both lands and grooves.
For example, if the spiral track starting from the index header is traced, after passing the groove track for one round, the index header and the dummy area 201 are passed,
After passing through the land track for one round, it passes through the index header and the dummy area 201 again, and then passes through the groove track for one round. That is, the index header is aligned only at one transition point between the land track and the groove track so that when the light is scanned along the spiral track, the index header appears only once for each track of the optical disc, and the index header is aligned next to it. The dummy area 201 is arranged in the.

However, the present invention is not limited to this. For example, when the light beam is scanned along the spiral track, the index header 1 appears so that the index header 12 appears twice per track.
2 may be aligned to two disc-shaped locations. Furthermore, the index header 12 may be aligned at three or more locations on the disc.

Further, as shown in FIG. 8, the index header 12 has an Ha header 30, an Hb header 31, an Hc header 32, and an Hd header 33. Ha header 3
0 is a VFO part consisting of a series of pits for synchronizing PLL, and Ha35 in which a track address is recorded.
Is equipped with. Similarly, the Hb header 31 includes a VFO section and Hb 36. Similarly, the Hc header 32 is VF
It has an O section and Hc 37. Similarly, Hd header 3
3 has a VFO section and an Hd 38. Ha35, H
Each of b36, Hc37, and Hd38 includes information such as AM (address mark), PID (physical ID), IED (error detection), and PAD (pad). VFO is formed on every track, but Ha3
5, Hb36, Hc37, and Hd38 may be formed by alternately skipping each track as shown in FIG. At this time, for example, Ha35 and Hb36 on the same track, Hc3
7, Hd 38 may be formed on the adjacent track. This is because when the track pitch is formed narrower than the spot diameter of the reproduction light beam, crosstalk from the adjacent tracks caused by the spot pitch is avoided.

Further, Ha35 and Hb3 are recorded on the same track.
6, Hc37 and Hd38 may all be formed. If two or more headers are formed on each track, even if one header cannot be read due to a defect or the like, the track can be determined by using the other header. Further, although the number of headers is four in this embodiment, the number of headers is not limited to four.

Next, the details of the dummy area 201 (outside the index header) will be described.

As a feature of the optical disc, each recording layer has an index light 2 as the irradiation light 2 as shown in FIGS.
The layers 22 are stacked so as to overlap each other when viewed from the incident direction. However, the overlapping of the index headers may be displaced as shown in FIG. 4 within the range of allowable accuracy.

The dummy areas 201 arranged on both sides of the index header will be described in detail. As described above, generally, the transmittance and the reflectance are different when the recording film is in the recording mark (amorphous state) and in the initialization region (crystallized state). Here, it is assumed that the first recording layer 214 has an amorphous transmittance higher than that in the crystallized state and a reflectance lower than that in the crystallized state. Further, it is assumed that information has been recorded on the entire surface of the information recording area of the first recording layer 214. Here, consider a case where the second recording layer 215 is accessed through the first recording layer 214. In the optical disc shown in FIG. 2, when the index header area of the first recording layer 214 and the index header area of the second recording layer 215 completely overlap, recording is not performed in the index header area. Even if the recording light intensity decreases in the index header area of the second recording layer 21
Since 5 is not the information recording area, the influence is small. Further, when the reproduction light passes through the index header of the first recording layer 214, the reproduction light intensity reaching the second recording layer 215 also decreases, and the reflectance from the second recording layer 215 increases and reproduction is performed. Although the signal offset increases, the first recording layer 2
If the entire defocus spot 223 formed at 14 enters the index header area, there is no transient change in the signal level. Therefore, stable reproduction can be performed by controlling the offset gain of the reproduction signal. However, the second recording layer 215
2 is accessed, since the spot on the first recording layer 214 is defocused as shown in FIG. 2, in the section 2a218 of the information recording area, part of the defocus spot 223 is on the first recording layer. Since it is applied to the embossed pit 214, the recording light intensity is lowered and stable information recording cannot be performed. In addition, section 2a218 and section 2b
In 219, the reproduction light intensity fluctuates during reproduction, and it is difficult to control the gain, etc., so that stable reproduction cannot be performed. Particularly, the section 2b219 is an index header and must always be reproduced stably. Therefore, the section 1a216 of the first recording layer 214 is used as the dummy area 201 and has the same transmittance and reflectance as the index header. As a result, the reproduction light intensity can be kept constant during reproduction of the index header of the second recording layer 215. Further, the section 2c220 of the second recording layer 215 in which the recording light intensity is reduced is used as a dummy area 201 in advance as a recording prohibition area for user information. As a result, the recording light intensity does not decrease in the information recording area of the second recording layer 215.

Further, as shown in FIG. 4, consider a case where the index headers are misaligned. It is assumed that the index header of the first recording layer 214 deviates from the index header of the second recording layer 215 by the maximum X. When the displacement occurs, the portion of the first recording layer 214 that has been the index header until now becomes the information recording area when viewed from the second recording layer 215 in the overlay displacement section, and the transmittance is higher than that in the case of the index header. Will be higher. Therefore, it is necessary to extend the dummy area 201 only in this section and make the transmittance equal to that of the index header area. Further, since the misalignment of superposition may be shifted to the front or back, it is necessary to arrange the dummy areas 201 of the same length on both sides of the index header. Further, when the dummy area 201 of the first recording layer 214 is extended in this way, the recording light intensity of the second recording layer 215 is reduced in a wider range than before. Therefore, FIG.
The area where there is a possibility that the recording light intensity will decrease as shown in (1) is set as the dummy area 201, and recording of user information is prohibited.
As a result, the recording light intensity does not decrease in the information recording area of the second recording layer 215.

From the above, in order to keep the reproduction light intensity during reproduction of the index header of the second recording layer 215 constant, both sides of the index header of the first recording layer 214 are
A dummy area 201 having a width of (half the width of the defocus spot 223 formed on the first recording layer 214 when focused on the second recording layer 215) + (maximum deviation width of overlay) is arranged. , The transparency should be equal to the index header. In addition, in order not to cause a decrease in recording light intensity in the recording area of the second recording layer 215, the first recording layer 21 is provided on both sides of the index header of the second recording layer 215.
It is necessary to dispose a dummy area 201 having a width twice as large as that of 4 to make it an information recording prohibited area.

The case where the dummy areas 201 having the same width are provided on both sides of the index header of the first recording layer 214 has been described above.
1 has the same transmittance and reflectance, the first recording layer 214
With respect to, if the combined width of the index header and the dummy area 201 is equal, the index header does not need to be in the center. That is, the left and right dummy regions 20
The width of 1 may be different. However, the second recording layer 2
Since the index header of 15 needs to have a uniform transmittance of the first recording layer 214, the dummy areas 20 on both sides of the index header
The width of 1 must be equal.

Further, in the optical disk device in which the reproduction signal level from the second recording layer 215 is kept constant even if the reproduction light intensity changes due to the change in the transmittance of the first recording layer 214 by controlling the reproduction gain. The dummy area 201 of the first recording layer 214 is unnecessary. At this time, the second recording layer 215 (when the second recording layer 215 is focused, the first recording layer 21 is adjusted so as to cope with the change in the recording light intensity).
Dummy region 2 having a width of (half the width of the defocus spot 223 formed in 4) + (maximum displacement width of overlay)
01 may be arranged and this portion may be used as an information recording prohibited area.

Further, the first recording layer 214 and the second recording layer 21
When it is desired to make the areas of the information recording areas of No. 5 equal, the width of the defocus spot 223 formed on the first recording layer 214 (half the width of the defocus spot 223 formed on the first recording layer 214 when focused on ) + (Maximum displacement width of overlay) It is necessary to eliminate the two areas of the width from the information recording area, but the transmittance of this area needs to be equal to that of the information recording area.

Next, another dummy area arranging method will be described with reference to FIG. As shown in FIG. 6, the dummy area 201 is arranged in the first recording device 214 as in FIG. The second recording device 215 uses the index header 12
And tracks are formed. Here, the second recording layer 21
FIG. 6B shows a change in the reproduction sum signal of the second recording layer 215 when the focus is on 5. When the first recording layer 214 moves from the track (recording field) to the embossed pits (dummy area and index header), the transmittance and reflectance of the first recording layer 214 change, so the reproduction sum signal of the second recording layer 215 is changed. The offset of changes. That is, the reproduction signal changes in the section 3a and the area section 3b even though the same track is reproduced. Therefore, the track of the second recording layer 215 corresponding to the range where the optical characteristic of the first recording layer 214 is different from that of the recording field 15 is set as the dummy area 201, and writing in the recording field 15 is prohibited. However, a signal such as VFO different from the user data may be recorded here for generation of a synchronization signal, reflectance control, or the like. By doing so, the dummy area 201 of the second recording layer 215 can be suppressed to the same extent as the dummy area 201 of the first recording layer 214. However,
The left and right widths of the dummy area 201 with respect to the index header 12 of the second recording layer 215 change depending on how the recording layers are attached.

Therefore, in this disc, an area for writing information indicating the position of the dummy area 201 of the second recording layer 215 is provided in the lead-in area 203. Once the disc has been reproduced, the range to be the dummy area 201 of the second recording layer 215 is detected from the signal as shown in FIG. 6B, and this information is recorded in the lead-in area 203. Specifically, this information is the number of wobbles from the index header 12 and the time width. The position of the recording field 15 can be specified based on this result.

Next, the lead-in area 202 and the lead-out area 204 will be described. In addition, the dummy area 20 of the lead-in area and the lead-out area 204
1 will be described.

In the DVD-RAM, the lead-in area is from the radial position 22.59 mm to 24.101 mm. Of these, 22.59 mm to 24.0
Embossed pits and mirrors are formed up to 00 mm, and the remaining portion is a rewritable area. Lead-out area 204 is 57.889 mm to 58.4
Up to 93 mm, all are rewritable areas. Ref in the embossed area 202 of the lead-in area
erence code and Control data
Is recorded. In the rewritable area of the lead-in area and the lead-out area 204, DMA, d
iscidentification zone,
Guard track zone, Drive t
The est zone and the Disc test zone are provided. Since the disc of the present invention has a plurality of recording layers, each recording layer has a lead-in area and a lead-out area 204 as shown in FIG. The embossed pit and mirror area of the lead-in area are the same as DVD-RAM, from 22.59 mm to 24.00
0 mm. Due to the deviation of the bonding of the lead-in recording layers and the eccentricity of the recording layers, the overlapping of the embossed pits and the mirror area of the first recording layer 214 and the second recording layer 215 is deviated. In consideration of this deviation, the dummy area 201 is defined as 24.000 mm to 24.070 mm of the first recording layer 214. Furthermore, 24.070 mm
To 24.101 mm is set as the rewriting area 203 of the lead-in area. In the second recording layer 215, 24.0
Dummy area 20 from 00 mm to 24.140 mm
The rewrite area 203 of the lead-in area is 1, 24.140 mm to 24.170 mm. As a result, the embossed pit area of the lead-in area can be stably reproduced. The lead-out area 204 is from 57.889 mm of each layer to the outermost circumference. At this time, the dummy area 201 may be arranged also on the outer peripheral side of the lead-out area 204, but since there is no embossed pit area in this area, the dummy area of the first recording layer 214 for uniformizing the reproduction light intensity is provided. 201 is not necessary. Although it is possible that the outermost circumference of the disc is shifted, the dummy area 201 required for the second recording layer 215 can be replaced by the guard track zone.

As another method, a lead-in area is arranged on the inner circumference side of the first recording layer, a lead-out area 204 is arranged on the inner circumference side of the second recording layer, and a middle area is arranged on the outer circumference side of each recording layer. However, in this case, the area of the second recording layer that is affected by the embossing of the lead-in area and the reduction of the transmittance in the mirror area is prohibited as a dummy area for recording or is set as a guard track zone.

Next, details of the recording field will be described.

Next, the data arranged on the spiral track will be described. When recording data on the first recording layer 214 or the second recording layer 215, a predetermined number of rewritable recording fields 15 are recorded on the spiral track. Further, as shown in FIGS. 7 and 9, the recording field 15 includes a header field 19 for storing the address data of the recording field 15 and a data field 20 for storing various data. This recording field 15 has one E
Data is recorded in CC block units. The ECC block will be described later. Once the address is recorded in the header field 19 by formatting or the like, the address recorded in the header field 19 cannot be rewritten unless reformatted. The data field 20 is rewritten every time data is rewritten.

Here, when the recording fields 15 are continuously recorded on the track, a certain recording field 15 may cross the index header 12 as shown in FIG. That is, one recording field 15 formed by a predetermined track length is the index header 1
2 recording fields 1 across 2 and the dummy area 201
May be divided into 5. These two divided recording fields 15 are referred to as a sub recording field a16 and a sub recording field b17.

As described above, each recording field 15
Is a header field 1 containing its own address
9 and a data field 20 for storing various data.

As shown in FIG. 10, the sub-recording field a16 and the sub-recording field b17 have a connection area for connecting both sub-recording fields. In the connection area of the sub recording field a16, for example, PA (postamble) is arranged. Besides, a guard area or a buffer area may be arranged. For example, PS (presync) is arranged in the connection area of the sub recording field b17. In addition, GAP, guard area, VF
The O region may be arranged. Further, if the connection area of the sub-recording field a16 has the same configuration as the rear of the recording field and the connection area of the sub-recording field b17 has the same configuration as the front of the recording field, FIG.
As shown in FIG. 1, the sub recording field a16 and the sub recording field b17 also include the header field 19 and the sub data field 43. In the header field 19 of the sub recording field a16 and the header field 19 of the sub recording field b17,
By storing the same address data, it is possible to improve reliability at the time of recording / reproducing data. Further, in order to be recorded in the sub recording field a16 and the sub recording field b17, the data of one ECC block is divided and recorded in the sub data field 43 of the sub recording field a16 and the sub data field 45 of the sub recording field b17. It

Next, the structure of the recording field will be described.

FIG. 9 is a diagram showing details of the recording field 15. The header field 19 contains two headers,
It is composed of a header a and a header b, and a mirror unit. The headers are all 46 bytes, and the specific configuration is the same as each header of the index header. The mirror unit is used to detect the boundary between the header field and the data field. Once recorded, the header fields cannot be rewritten unless reformatted. Once the header field is recorded, the address of the recording field 15 is determined from this header, and the index header and wobble are used as auxiliary address data.

The data field 20 includes GAP and Gua.
rd1, VFO, PS, data, PA, Guard2,
It consists of Buffer. The GAP is provided for laser recording start-up, power control, and random shift of recording position. Each time J is rewritten, a random number from 0 to 15 is entered. Normally, the same signal as VFO is recorded. Guard1 is for countermeasures against deterioration that appears at the beginning of the recording signal when recording is performed many times. K is a random number from 0 to 7. Normally, the same signal as VFO is recorded. VFO is a PLL synchronization signal, PS is a presync signal, and data is data of one ECC block.
The configuration of the ECC block will be described later. PA is for the postamble, and Guard2 is for measures against deterioration that appears at the rear end of the recording signal. K is a random number from 0 to 7, and the same value of K as that of Guard1 is used. Usually V
The same signal as FO is recorded. The Buffer is used for absorbing the difference in the length of the recording field 15 due to the eccentricity, the fluctuation of the rotation of the disk, and the random shift of the recording position. The value of J is 0 to 15, and the same value as J of GAP is used.

Next, the format and the actual recording method will be described. Also, a procedure for recording a recording field on the spiral track of the optical disk will be described.

Generally, in the case of an optical disc for recording data, after the disc is formed, annealing called initialization is performed, and the recording film is in a crystallized state. After that, inspection and physical formatting for checking the defect state of the disk are performed. This defect inspection, for example, writes specific data to the entire disc, checks the error status,
The recording field 15 having an uncorrectable error or the recording field 15 having an error equal to or larger than a certain value is replaced with another recording field 15 having no error. Although this operation is a defect inspection of the disc, it takes a long time because the entire surface of the disc is recorded / reproduced, and the cost of the disc is increased.

Therefore, large defects are checked by another efficient method (scanning with a large light spot for checking), and checking by writing data is limited to only the area in which the directory is created, or in some cases. Depending on the case, it may not be checked at all.

In the DVD-RAM, one recording field 15 (1 ECC block) is divided into 16 physical sectors and recorded. Since address data is formed in each physical sector, any recording field 1
It is possible to record data in 5. If defect management is not performed, all physical addresses are determined from the beginning, so data can be recorded in any recording field 15 without physical formatting, which is one of the features. There is.

On the other hand, since the track address data is recorded in the index header 12 of the optical disk 10 of the present invention, reading the index header 12 determines all track addresses. On the other hand, the recording field 15 is not formed in the initial state. Therefore, the header field having the address of the recording field is not recorded. However, since the arrangement of all the recording fields 15 can be determined from the index header 12 and the number of wobbles formed in the recording track, if the index header 12 and the wobble signal are detected, the writing of data to any recording field 15 is performed. Is possible.

For computer data recording applications,
Generally, data is recorded over the entire surface of the disc to manage defects. In the optical disc 10 of the present invention, at this time,
Writing of the entire recording field 15, that is, physical formatting is performed. That is, the recording field 15 is recorded over the entire surface of the optical disc, and at this time, the header field 19 and the data field 2 are recorded.
0 is recorded. At this time, when it intersects with the index header 12 as described above, it is divided into two sub-recording fields and recorded.

When the recording field 15 is first recorded by physical formatting or the like, the header a of the header field 19 to the Guard 2 of the data field 20 shown in FIG. 9 are continuously recorded.
From the second time onward, G from the GAP part of the data field 20
Up to ard2 is rewritten. Actually, the same signal as VFO is recorded from the middle of the GAP part, and Guard2
end with. Therefore, in the recording field 15, there is at least a signal-free area of 2 bytes or more in the mirror portion and the buffer portion.

Next, the ECC block will be described with reference to DVD.

FIG. 12 shows 172 bytes × 12 rows (206
It shows the structure of a data frame composed of 4 bytes. This data frame consists of 2048 bytes of main data and 4 bytes of data I indicating the ID of the data frame.
D, 2-byte IE for data ID error detection
D, a reserved 6-byte RSV, and a 4-byte EDC for detecting main data error. This main data is scrambled so that consecutive 0s and 1s do not occur.

An ECC block, which is a recording unit of a DVD (ROM and RAM), is composed of 16 data frames in which main data is scrambled, and is composed of 172 bytes × 192 rows as shown in FIG. As an error correction code, an inner code PI of 10 bytes is added to each row and an outer code PO of 16 rows is added to each column, and the entire ECC block is composed of 182 bytes × 208 rows. Then E
The CC block is divided into 16 interleaved recording frames including one row of PO as shown in FIG. 14 in order to improve the ability to correct block errors.

Next, for each row of the recording frame, 8-1
Six modulations are performed, and as shown in FIG. 15, 2 bytes of sync bytes are added to every 91 bytes. As a result, the recording frame has two sync frames each having 93 bytes, and a total of 26 sync frames (2418 bytes).

In the DVD-ROM, the 26 sync frames are set as one recording frame, and the 16 recording frames are set as one ECC block (38688 bytes) and are continuously arranged on the track. Therefore, the format efficiency is 84.7%.

On the other hand, in the DVD-RAM, these 26 sync frames are recorded in one physical sector. Each physical sector has a structure similar to that of FIG. 9, and includes a header field of 130 bytes and a recording field 15 of 2567 bytes. The total length is 2697 bytes (2
9 sync frames), of which the data is 2048 bytes, the format efficiency is 75.9%.

Each track of the DVD-RAM is formed of wobbled lands and grooves except for the header part of each physical sector. The number of wobbles is eight per one sync frame. Since one ECC block is composed of 16 recording frames, the ECC block is composed of 416 sync frames.

In the embodiment of the present invention, the DVD-R is used as the sync frame, the recording frame, and the ECC block size.
Since the same value as AM is used, one sync frame is 9
There are 3 bytes and 8 wobbles, and one recording frame is composed of 26 sync frames and one ECC block is composed of 416 sync frames. As described above, the index header 12 has a length of 2 sync frames.

As shown in FIG. 9, the recording field 15 is composed of a header field 19 and a data field 20, and a total of 420 sync frames. Of these, the data portion for one ECC block is a 416 sync frame. If the front part of this data part is called the front part and the rear part is called the rear part, one recording field 15 consists of the data part and the front and rear parts each consisting of two sync frames.

FIG. 11 is a diagram showing the handling of the sub recording field when the recording field 15 intersects the index header 12. If the front side of the index header is the sub recording field a16 and the rear side is the sub recording field b17, each sub recording field is a header field 19 and sub data fields 43 and 44.
Consists of. The sub recording field is the recording field 15
The data a44 of the sub-recording field a is M sync frames: 1≤M≤, since each of them is composed of a front 40 and a rear 42 of two sync frames except for the data part.
It becomes 415. Then, the sub recording field b17
The data portion 46 of is a (416-M) sync frame.

Next, the present invention will be described with specific numerical values. The wavelength of the violet laser used is 405n
m, NA of the objective lens is 0.66, the diameter of the optical disc is 120 mm, and the recording area is the same as the DVD-RAM.
It is set to 4.1 mm to 57.89 mm. Data recording is D
The same ZCLV recording method as VD-RAM is used. The number of zones can be freely set because it is not necessary to align the physical sectors as in the DVD-RAM. Here, the number of zones in each recording layer is set to 100 so that the change in the recording clock between zones is about 1% even when continuous writing is performed from the inner circumference to the outer circumference. However, the lead-in area provided on the inner side of the disc and the lead-out area 204 provided on the outer side of the disc are omitted here.

FIG. 16 shows an embodiment of the layout of tracks in each zone. The track pitch is set to 0.348 μm in consideration of cross erase with adjacent tracks. The total number of tracks is 97,000, and the number of tracks in each zone is 970. On the other hand, the bit length is set to 0.159 μm in consideration of OTF and the like. Further, when the distance between the recording layers is set to 25 μm in consideration of aberration and the like, the diameter of the defocus spot 223 formed on the first recording layer 214 when focusing on the second recording layer 215 is about 4 μm. . Assuming that the shift amount of index header superposition is ± 50 μm at maximum in the circumferential direction, the first recording layer 214
The width of the dummy area 201 provided on one side of the index header provided at is 54 μm on one side and 10 on both sides.
8 μm. The width of the dummy area 201 provided at the same position on the second recording layer 215 is the shortest and is 108 μm on one side.
m and 218 μm on both sides. Here, since one sync frame length is about 118 μm, for the sake of simplicity, the first recording layer 21
The dummy area 201 of No. 4 has one sync frame length, and the dummy area 201 of the second recording layer 215 has two sync frame lengths. However, the width of the dummy area 201 does not necessarily have to be an integral multiple of the sync frame length.

Here, each track of zone 0 including the innermost track has a length of 119319 bytes, and a total of 128 tracks.
3 sync frames. Of these, 2 sync frames are index headers. Further, one sync frame is used for the first recording layer 214 and two sync frames are used for the second recording layer 215.
The sync frame is the dummy area 201. For example, in the first recording layer 214, recording fields are arranged in the remaining 1280 sync frames.

Next, the zone 0 of the first recording layer 214 is shown in FIG.
The relationship between the track and the recording field is shown. Track 0
When three recording fields 15 each consisting of 420 sync frames are written, the number of surplus sync frames of track 0 becomes 20. That is, a sub recording field of 20 sync frames is generated. In this sub-recording field of 20 sync frames, 4 sync frames are assigned as the front and rear, and 16 sync frames are assigned as the data part. Next track 1, 404
The sub recording field of the sync frame occurs. In this sub recording field of 404 sync frames, 4 sync frames are assigned as front and rear,
400 sync frames are assigned as the data part. That is, the sub recording field of 20 sync frames and the sub recording field of 404 sync frames described above correspond to the sub recording fields a and b shown in the figure.

Further, when two recording fields of 420 sync frames are recorded following the sub recording field of 404 sync frames, the surplus becomes 36 sync frames. That is, a sub recording field of 36 sync frames is generated. In this sub recording field of 36 sync frames, 4 sync frames are assigned as front and rear, and 32 sync frames are assigned as data. On the next track 2, a sub recording field of 388 sync frames occurs. In the sub recording field of this 388 sync frame, 4 sync frames are assigned as the front and rear, and 384 sync frames are assigned as the data part.

If this is continued, the arrangement of the recording fields and sub recording fields in zone 0 is all determined. If this process is continued up to the zone 99 of the second recording layer 215, the arrangement of recording fields and sub recording fields of the entire disc is uniquely determined. Formatting efficiency is 83.6% for the first recording layer 214 and 83.5% for the second recording layer 215.
Becomes This value is 84.7% of DVD-ROM,
It is a decrease of about 1%, and it can be seen that it is significantly improved compared to 75.9% of the DVD-RAM. Here, the dummy areas 201 on both sides of the index header in the first recording layer 214 are 0.1% of the entire first recording layer 214, and the dummy areas 201 on both sides of the index header in the second recording layer 215 are the second recording layer 215. It only accounts for 0.2% of the total.

Next, the data arranged in the dummy area 201 will be described. Dummy area 20 of first recording layer 214
No. 1 needs to have the same transmittance as that of the index header, so that it is desirable to set the same embossed pit area as that of the index header. The data formed by the embossed pits may be, for example, data indicating all 0s or VFO.
It is possible to use the same data as above or random data.

The dummy area 201 of the second recording layer 215 needs to be a recording prohibition area for user information. Further, in this region, there is a portion where the reproducing light intensity changes transiently.
Therefore, all 0s formed by embossed pits are formed in this area.
It is conceivable to record the same data, the same data as the VFO, or random data. In addition, this part is shown in Figure 6.
It may be used as a groove track or a land track as a buffer area as shown in FIG.

In addition to this, for example, data having a known mark length and a known mark interval may be arranged. By using this data as the adaptive equalization of the waveform and the training pattern of the crosstalk canceller, the accuracy of the waveform equalization at the time of reproducing the optical disk can be improved. A transversal filter is used for the adaptive equalizer that performs adaptive equalization.
At this time, the tap gain of the transversal filter is set so that the waveform after equalization is exactly the target signal waveform.
It is calibrated sequentially by an adaptive algorithm and adaptively adjusted to a desired value so that the equalization error finally becomes zero.
At this time, since the training pattern is known, the tap gain can be converged accurately and efficiently by comparing this pattern with the reproduction signal pattern after adaptive equalization. Similarly, in a crosstalk canceller, for example, a transversal filter is used as a waveform equalizer. By comparing the equalized reproduction waveform obtained when the training pattern is reproduced with the ideal reproduction waveform obtained from the training pattern, the tap gain of the transversal filter can be converged accurately and efficiently. For example, the training pattern at this time is a known random pattern including marks and mark intervals of 3T, 4T, and 5T or more, 3T, 4T, 5T, 6
.., 14T, a stepwise pattern in which the mark length and the mark interval are sequentially increased.

Further, since the data having known mark lengths and mark intervals are arranged, the amount of signal leakage from the left and right tracks can be known. Therefore, the tilt amount of the disk should be measured based on this result. You can At this time, for the measurement, a random pattern or a stepped pattern as described above may be arranged. If a signal having a different frequency is arranged for each track, the spectrum of the reproduced signal is used for the scanning of the track to be scanned. It is possible to measure the ratio of the signal amplitude and the amount of leakage on the left and right tracks.

Further, a portion for arranging data having known mark lengths and mark intervals every other track is provided. When this track is reproduced, the influence of crosstalk from an adjacent track can be eliminated, so that, for example, the adaptive equalization described above can be performed accurately. Further, if a track without data adjacent to a track in which data is arranged is reproduced, the amount of signal from the adjacent track that leaks into the reproduction signal can be accurately measured, and thus the amount of crosstalk from the adjacent track can be known. Further, the tilt amount of the disc can be obtained from the ratio of left and right crosstalk. Further, by providing a portion for arranging data having known mark lengths and mark intervals every two tracks and reproducing a track having no data, the crosstalk amount from one side track can be measured. 18 and 19 show examples of arrangement of data having known marks and mark intervals. Figure 1
In the arrangement of 8, if the track B is reproduced, for example, the amount of signal leakage from the data recorded on the tracks A and C can be measured. The signal can be reproduced on the track C without being affected by crosstalk. When the track F is reproduced, the amount of signal leakage from the data recorded on the track E can be measured.

If the data are alternately arranged as shown in FIG. 19, the measurement described with reference to FIG. 18 can be performed without changing the reproduced track.

By arranging the data for the training pattern 231, the format efficiency of the recording field 15 does not decrease.

Next, an example of a method of manufacturing the optical disc 10 will be described. As shown in FIG. 20, the substrate 211 of each recording layer of the optical disc is formed separately. The resist film 2 on the original plate 234
33 is applied and recording is performed thereon to form a resist film 233 on which tracks and embossed pits are formed. Next, a stamper mold 235 is created from this original plate 234. Resin is molded by this stamper mold 235,
The resin molded substrate 236 is manufactured. Further, a recording layer 237 including a plurality of films is formed on the resin molded substrate 236 by using a sputtering device or the like. Finally, the two substrates 211 are faced to each other with the intermediate layer 212 interposed therebetween to complete the process. In the case of producing a reproduction-only disc, a resin-molded substrate 236 having embossed pits is molded, and a reflective film is formed on a layer on the back side of the resin-molded substrate 236 and a semi-transparent layer is formed on the front side. Form the membrane. Finally, the two recording layers 237 are face-to-face bonded to each other with the intermediate layer 212 interposed therebetween to complete the process.

In this bonding step, it is necessary to bond the layers so that the index headers 12 of the respective layers are superposed with appropriate accuracy in the radial direction of the disk and the circumferential direction. Since the index header 12 has optical characteristics different from those of the other areas, the recording layers can be overlapped so that the index headers overlap with each other with this as a mark. At this time, in the disc shown in FIG. 4, the embossed pit area of the first recording layer may be bonded so as to be completely contained in the second recording layer. In the disc shown in FIG. 6, the embossed pit area of the first recording layer 214 is bonded so that it is completely contained in the second recording layer 215. In addition, as shown in FIG. 21, each layer of the optical disc has a mark 238 serving as a bonding mark, and an area not used for recording / reproducing normal information on the innermost or outermost periphery of the optical disc so as not to impair the capacity. You may have it. This mark 238 may be a point having the same size for each layer, or a point on either layer may be larger than the other point by an allowable overlay error. As shown in FIG. 22, in the case of the pasting, the pasting is performed while observing with an optical sensor or the like so that the marks 238 of the respective layers are completely overlapped. In the latter case, the smaller indicia 238 are attached so that they fit completely within the larger indicia 238. At this time, the width of the dummy regions 201 required on both sides of the index header changes depending on the accuracy of the circumferential alignment of the index header. The misalignment in the radial direction has little effect because the index header is aligned in the radial direction over the entire disc. As for the width of the dummy area 201 around the lead-in area and the lead-out area 204, it is necessary to consider the deviation in the radial direction.

Next, with reference to FIG. 23, an optical disk device for driving the above-mentioned optical disk 10 to record and reproduce data will be described.

The optical disk 10 is mounted on the spindle motor 100 by the clamp hole 11 and the clamper 101. The spindle motor 100 is a motor driver 1
Driven by 80. An optical head 110 is provided so as to face the rotating optical disk 10, and the optical disk 1 is irradiated by a light beam emitted from the optical head 110.
Recording and reproduction to 0 are performed.

The optical head 110 includes an objective lens 111, a lens actuator 115 that moves the objective lens 111 in the focus direction and the radial direction of the disc, an optical system 113 for recording and reproduction, a purple semiconductor laser LD, and a disc. A multi-division photo detector 114 for extracting a reproduction signal from the reflected light from is provided. The entire optical head 110 includes a radial feed actuator 11
At 5, the disk 10 is moved radially.

The light emitted from the semiconductor laser LD is
After passing through the optical system 113, it is condensed by the objective lens 111,
The recording layers of the optical disc 10 are arbitrarily focused.
The reflected light from the disk traces back the objective lens 111 and the head optical system 113, and is incident on the multi-divided detector 114. The plural-divided detector 114 includes a two-divided push-pull detector that detects a tracking error signal, and tracking to the groove track 13 is performed using the signal detected by the two-divided push-pull detector. The servo information from the detector is processed by the reproduction amplifier 120 and the signal processing unit 130,
A control signal is generated by the control unit 150 and supplied to the ACT driver 170.

The RF reproduction signal is received by the detector for reading. The RF reproduction signal is amplified by the reproduction amplifier 120 and then sent to the signal processing unit 130. A wobble signal is superimposed on this RF reproduction signal, and can be easily separated by using a low-pass filter. Further, the reproduced signal of data can be separated by using a high-pass filter that does not pass this wobble signal.

The detected wobble signal has 8 cycles per sync frame, and wobble is present in the innermost track 0 except for the index header and the dummy area 201. The rotation speed of the spindle motor is controlled using a rotation control signal generated by dividing the wobble signal. For this reason, the rotation of the spindle motor is synchronized with the wobble signal of the disk, so that a small buffer is required for recording data. The rotation control signal described above is generated in the control unit 150.

On the other hand, the wobble signal is multiplied and used as the clock signal used for recording. That is, the frequency of the recording clock signal is determined based on the frequency of the wobble signal. In the case of 8-16 modulation, since there are 186 channel bits per wobble, the clock signal is 186
It will be multiplied. By creating the recording clock from the wobble signal, the length of the buffer of the data field 20 can be shortened. This recording clock is used by the control unit 15
Generated at zero.

Next, FIG. 24 shows the structure of a reproduction-only device. This is obtained by removing the recording control device, the formatter, and the test recording element from the recording / reproducing device of FIG. With this device, it is possible to reproduce not only the reproduction-only disc but also the recording / reproduction disc after the recording field is recorded.

Next, with reference to the flowchart of FIG. 25, physical formatting mainly for computer use will be described. As already mentioned, 9700
Zero tracks are divided into 100 zones, and each track in each zone is composed of a plurality of recording fields (including sub-recording fields). The physical address of an arbitrary recording field is determined by the track address embossed in the index header and the number of wobbles starting from the index header.

First, the optical disk 10 is mounted on the optical disk device, and the spindle motor 100 is rotated (ST1
1) and then focus control is performed (ST11). When formatting for the first time, first, the first recording layer 214
To access. While tracking (ST1
1) The optical head 110 is moved to the lead-in area on the inner circumference side. Further, the signal processing unit 130 detects the tilt amount and controls the tilt ACT based on the result. At this time, the control unit 150 functions as a tilt control unit. In this state, the wobble signal is detected (ST12),
The rotation of the motor is controlled by the wobble signal (ST
13).

Since the recording is the first recording after the disc is inserted, the recording strategy is optimized before the physical formatting. When the spot enters the test recording area, the control unit 150 generates test data from the information of the test pattern stored in the memory 151 and records the test pattern. Then, the reproduced signal of the recorded test pattern and the test pattern stored in the memory 151 are statistically compared and determined by the signal processing unit 130 to determine the optimum recording strategy. The result is stored in the control unit 150 and used for the subsequent recording control. Then, via the interface 190,
When a physical formatting command is issued to the optical disk device, the address embossed in the index header is read (ST14), and the first recording layer 214 is read.
Search for track 0. On the other hand, the formatter generates data to be recorded in the header field 19 and the data field 20 in preparation for writing in the recording field 15. When the index header 12 formed by the emboss signal of the track 0 is detected, recording in the recording field 150 starts immediately. The recording clock is
A clock obtained by multiplying the wobble signal is used, the signal read from the formatter is input to the LD driver 160, and recording on the optical disc 10 starts (ST15).
The address of the recording field 15 is incremented,
The recording field 15 is recorded one after another. By recording the last recording field 15 of the outermost track of the recording area,
Writing of the format signal of the first recording layer 214 is completed.

Then, the second recording layer 215 is accessed. At this time, since the dummy area 201 of the second recording layer 215 is arranged in advance in the disc shown in FIGS. 2 and 4, the format signal is written in the same manner as in the case of the first recording layer 214 to complete the formatting of the disc. To do.

In the optical disc as shown in FIG. 6, the position of the dummy area 201 of the second recording layer 215 is not determined in advance, so it is necessary to determine it. in this case,
The dummy area 201 of the second recording layer 215 is the first recording layer 21.
It is determined by the range of reflectance change and transmittance change that occur in the index header 12 of No. 4 and the embossed pits of the dummy area 201. Therefore, the dummy area 201 of the second recording layer 215
In order to determine the range, the second recording layer 215 is reproduced for one track. This reproduced signal is, as shown in FIG.
Since there is an offset in the embossed pit area of the first recording layer 214, a reference level is determined in advance, and the area that has changed beyond that level is set as the range of the dummy area 201 of the second recording layer 215. More specifically, starting from the end of the index header 12 of the second recording layer 215, the state where the reproduction signal exceeds the reference level returns to the normal state (the portion where the first recording layer 214 is different from the embossed pits). The dummy area 201 extends from the moment to the position where the recording signal can be synchronized first. From this position, recording of the recording field 15 is started and sync frames are arranged. The sync frames are arranged in order for each track, and the area up to where the sync frame can be clearly arranged is defined as the recording area before the reproduction signal exceeds the reference level, and the area from the index header 12 to the dummy area 201. To do. Here, the synchronization of the recording signal is determined by the phase of the wobble 18. The range information of the dummy area 201 determined by the above procedure, specifically, the information on the number of wobbles and the time width from the index header is recorded at a predetermined position in the memory of the information recording / reproducing apparatus or the lead-in area of the disc. Dummy area 2
If the range of 01 is determined, the arrangement of the recording fields 15 of the entire second recording layer 215 is determined, and therefore the first recording layer 21
The format signal is written in the same manner as 4 to complete the formatting of the disc. Here, the range of the dummy area 201 may be determined for all tracks, but may be determined once for each zone or only once on the disk. The data recorded in the data field of the recording field 15 at the time of formatting is data for inspecting a defect of the optical disc, and the same data is recorded in all the recording fields 15. At this time, since the signal is recorded in the entire recording area of the first recording layer 214, the transmittance in this area is uniform throughout, so that stable recording can be performed in the second recording layer 215. Wear.

After the physical formatting, it is checked whether the header information of the recorded recording field 15 and the data of the data field can be reproduced correctly. This is so-called defect management processing. If the data cannot be correctly read from the header field of the recording field 15 or if the data read from the data field has more errors than a predetermined standard, the recording field 15 is a recording field prepared for defect processing. Replaced with 15. At this time, before the desired data on the disc is reproduced, the training pattern 231 recorded in the adjustment area 231 is recorded.
Is reproduced, and the optimum tap gain of the adaptive equalizer and the optimum tap gain of the crosstalk canceller are determined in the signal processing unit 130. Further, when the light spot crosses the training pattern 231 during the defect management process,
The optimum tap gain may be reset.

In this way, like the general optical disc, if the user physically formats the entire optical disc before the data is recorded and the defect inspection is performed, all the physical addresses of the optical disc are determined. Will be the same as Further, the transmittance of the first recording layer 214 is always uniform on the front surface of the information recording area. Therefore, when the user records actual data, the optical disk device may look at the address of the header field of the recording field 15. The address data obtained from the index header and the wobble signal serves as reference information.

Recording of user data on the disk physically formatted as described above will be described below with reference to the flowchart shown in FIG.

First, the optical disk 10 is mounted on the optical disk device, and the spindle motor 100 is rotated (ST2
1) Then, focus control is performed on an arbitrary recording layer (S
T21). While tracking (ST21), the optical head 110 is moved to the lead-in area on the inner peripheral side. Further, the signal processing unit 130 detects the tilt amount and controls the tilt ACT based on the result. In this state, the wobble signal is detected (ST22), and the rotation of the motor is controlled by the wobble signal (ST23). Then, the address recorded in the header field in the recording field 15 is read (ST24), and the area where the training pattern 231 is recorded is accessed. Therefore, the training pattern 231 is reproduced to optimize the tap gain of the adaptive equalizer and the crosstalk canceller (ST24). Next, when a user data recording command is issued to the optical disk device via the interface 190, the target recording field 15 is accessed, and if the range of the dummy area 201 is predetermined, the control unit 150 generates it from the wobble signal. User data is recorded based on the recorded clock (ST25). Further, when the training pattern 231 is passed during recording, the tap gain of the successive adaptive equalizer and the crosstalk canceller may be re-determined and the tilt amount may be detected.

More specifically, the recording of the data in the recording field 15 after the physical format is performed by recording the address of the recording field 15 to be recorded and the data information to be recorded in the data field from the recording data received via the interface 190. Determine the sequence of. Next, the recording field 15 that matches the address is searched for, and if found, the data field is written. When the recording field 15 crosses the index header, writing is performed by dividing it into sub recording fields. The formatting information of the recording field 15 is stored in the formatter, and the physical state on the disc can be determined by designating the logical address. All of these are processed by the control unit 150.

However, it takes a lot of time to format the entire surface of the optical disc and check for defects. If the manufacturer does it, the cost will increase accordingly, and if the user does it, it will take too long before it can be used. Further, depending on the application, it may not be necessary to inspect the entire surface for defects. According to the present invention, even in such a case, it is possible to write data randomly at an arbitrary position and seamlessly record continuous data such as video.

It is assumed that only the part where the directory of the file is recorded is formatted, and the part where general data is not written is not formatted. The data is recorded in an unformatted area, but the control unit 150 (formatter) has an address space determined by the index header and the number of wobbles. Writing to the formatted area is done in the recording field 15
The data field is recorded only and the unformatted recording field 15 is recorded by collectively recording the header field and the data field.

If not physically formatted, both the header field and the data field of the recording field 15 are recorded using the address space in the control unit 150 (formatter). Of course, the data received by the interface is recorded in the data part of the data field.

At this time, if the information is recorded in the second recording layer 215 after the information is recorded in the entire information recording area of the first recording layer 214, the transmittance of the information recording area of the first recording layer 214 is increased. Is uniform, it is possible to perform stable recording on the second recording layer 215.

Next, the reproducing process of the data recorded on the optical disk 10 will be described with reference to the flowchart shown in FIG.

First, the optical disk 10 is mounted on the optical disk device, and the spindle motor 100 is rotated (ST3
1) and then focus control is performed (ST31). While performing tracking (ST31), the optical head 110 is moved to the lead-in area on the inner peripheral side. further,
Control tilt ACT. In this state, the wobble signal is detected (ST32), and the rotation of the motor is controlled by the wobble signal (ST33). Then, when a user data reproduction command is issued to the optical disk device via the interface 190, the address recorded in the header field of the recording field 15 is read (S
T34), the target recording field 15 is accessed.
At this time, when the light spot crosses the training pattern 231, the tap gains of the adaptive equalizer and the crosstalk canceller are optimized (ST34). The user data recorded in the data field of the target recording field 15 is reproduced by the control unit 150 based on the reproduction clock generated from the wobble signal (ST35). Specifically, the optical head 110 as a reproducing unit, the reproducing amplifier 120, the signal processing unit 130, the data processing unit 140, and the like reproduce the data recorded on the optical disc 10.

In this embodiment, the land-and-groove recording method has been described, but the same applies to the groove recording.

Further, in the present embodiment, the single spiral is explained, but the double spiral may be used.

Furthermore, although the present invention has been described in the case of rewriting, the same can be applied to a write-once medium which can be recorded only once.

Further, although the present invention has been described using the ZCLV method, the present invention allows the number of zones to be freely selected, so the number of zones can be made equal to the number of tracks. That is, it can also be applied to the CLV method.

Further, although the present invention has been described with respect to a rewritable optical disk, for compatibility with this, a ROM type optical disk formed with embossed pits will be described.
It is possible to apply exactly the same or almost the same format as the present invention.

In the embodiment of the present invention, the ECC block (32 kbytes: 416 sync frames) used in the DVD is used as the data recording unit. When the density is increased, it becomes necessary to further strengthen the ECC.
The C block size increases. When the ECC block size becomes 64 kbytes, naturally, the recording field 15 also becomes large, and other than that, the recording field 15 becomes relatively small. Therefore, the format efficiency is further improved.

In the embodiment of the present invention, four sync frames are used in total for the front and rear of the recording field 15, but the present invention is not limited to this.

In the embodiment of the present invention, the index header is set to 2 sync frames and 4 headers are arranged, but the present invention is not limited to this.

In the embodiment of the present invention, the number of recording layers is two, but a multi-layer disc having two or more layers may be used.

In the embodiments of the present invention, the transmittance and the reflectance are different between the crystalline state and the amorphous state. However, even if the transmittance and the reflectance are the same, the embossing and the groove cause light scattering and diffraction. Since the influences are different, the effect of the present invention is effective.

In the present invention, the optical disk has a plurality of recording layers, and a light beam can be incident from one surface to record / reproduce information on / from the selected target recording layer.
In each recording layer, the physical address of the recording field 15 is determined by the wobbles and the index header 12 formed by embossed pits at one place per circumference. The index is also radially aligned. The index headers 12 are attached to the respective recording layers so as to overlap each other when viewed from the light incident direction. A dummy area 201 is arranged around the index header 12 and the embossed pit area 202 of the lead-in area.
The transmittance and reflectance are adjusted. Therefore,
According to the present invention, information can be recorded and reproduced on each recording layer without any problem even if the transmittance and reflectance of the recording layer change between the embossed pit area and the other area. Further, each recording field can be randomly accessed by the address space determined from the index header and wobble or the address data of the recording field. Further, since frequency switching (frequency jump) due to zone switching (zone crossing) is within a negligible range, even long continuous information can be recorded seamlessly.

In the dummy area 201, the known mark length,
By arranging the data of the mark interval, it is possible to perform more accurate adaptive equalization, crosstalk cancellation, and tilt amount measurement. As described above, according to the present invention, adaptive equalization can be performed without arranging extra data in the recording field 15.
Since the crosstalk cancellation can be optimized and the tilt amount can be measured, it is possible to provide a disc capable of high-accuracy and highly reliable recording and reproduction even if the recording density is increased without lowering the format efficiency. Further, it is possible to provide an optical disc device, an optical disc recording method, and an optical disc reproducing method for recording and reproducing data on such an optical disc.

The format efficiency of the present invention is about 83.5%.
Thus, it is significantly improved compared to 75.9% of DVD-RAM. Since the format efficiency of a DVD-ROM that does not need to be rewritten is 84.7%, it is possible to use the DV according to the present invention.
The optical disc can be provided with a format efficiency loss of only 1% as compared with the D-ROM, and its practical effect is extremely high.

The operational effects of the present invention will be summarized below.

In the information recording medium of the present invention, since the index header is aligned in the radial direction over the entire disc, the track next to the index header does not become a recording field, so that the recording / reproducing stability of the recording field is maintained. Be done.

Further, since the number of revolutions of the information recording medium and the clock frequency for recording are determined with reference to the wobble frequency of the spiral track, and the reproduction signal can be synchronized from the wobble signal, it is provided in the recording field. The buffer for absorbing the eccentricity and the rotation fluctuation can be shortened as compared with the conventional one.

When the data is recorded for the first time without physically formatting the disc, the address data of the physical track is read from the index header arranged at one place in one circumference. The physical position within one round is accurately determined by counting wobbles from the index header. Therefore, it is possible to randomly record data at a desired position without physically formatting the disc.

Since the width of the zone division of the disk can be determined independently of the sector, the width of the division can be made narrower than that of the conventional one, or if the zone division is not performed, the clock frequency generated when straddling the zones is reached. Since the skip is small enough to be ignored, seamless recording of continuous information becomes possible.

Since there is only one embossed pit area per track, if the irradiation light is focused on the back recording layer through the front recording layer, the transmittance and reflectance of the front layer are There are few areas where the recording / reproducing of signals in the inner recording layer becomes unstable due to the change of.

Further, in the information recording medium of the present invention, by arranging the index headers of the respective recording layers so as to be overlapped with each other when viewed from the incident surface of the irradiation light, the irradiation light is irradiated to the recording layer in the back through the recording layer in the front. When the light is focused, even if the transmittance and the reflectance change in the index header of the recording layer on the front side, that part is not the additional write or rewrite area in most cases. Stable recording / reproducing of information becomes possible in almost all areas. Further, since the index headers are aligned in the radial direction over the entire disc, it is easy to overlap the index headers.

Furthermore, the information recording medium of the present invention is provided with the dummy area, and since the transmittance of the dummy area is equal to the transmittance of the index header or other embossed pit areas in the recording layer, Irradiation light is focused on the recording layer in the back, and while the index header or other embossed pit area in the back layer is reproduced, the change in the transmittance of the front layer is kept constant.

Further, in the information recording medium of the present invention, since the dummy area is additionally written or the rewrite prohibited area, the change in the transmittance does not occur due to the additional writing or the rewriting in the dummy area. Therefore, even if there is eccentricity of the disc or misalignment of the index headers of the respective layers, additional recording or stable recording / reproduction of information becomes possible in the entire rewriting area.

Further, the information recording medium of the present invention is provided with embossed pit marks of a known array in the dummy area. By using this embossed pit mark as a training pattern for waveform equalization, crosstalk canceller, and tilt amount detection, more accurate recording / reproducing of information can be realized without lowering the format efficiency in the recording field. it can. Since the dummy areas are distributed in the entire disc radial direction, even if there is a difference in tilt amount due to a difference in disc radius or a difference in waveform equalization condition, it is possible to measure the tilt amount at each radius. The waveform equalization conditions can be optimized. In addition, since the dummy area is around the lead-in and lead-out areas, or just before or after the index header, the physical position is determined even when the disk is not physically formatted. Is easy and does not interfere with continuous recording.

Further, since the information recording medium of the present invention has a mark as a sticking mark in a portion of each recording layer which is not used for recording / reproducing information, the index headers are overlapped by making this a target. Can be attached to.

Therefore, according to the present invention, in the optical recording medium having a plurality of recording layers laminated, light is incident from one surface to record and reproduce information on the selected recording layer, It is possible to perform additional recording on the disc or stable recording / reproduction on the entire rewriting area, and it is possible to record continuous data or random data on the entire optical disc without waste. Further, the training pattern can be arranged in the entire radial direction of the disc without deteriorating the format efficiency of the recording field.

Furthermore, since the format efficiency is high and the clock frequency jump across the zones is small or nonexistent, if the read-only data is provided instead of the write-once or rewrite area, this format is the format of the read-only disc. Can also be used as.

The invention of the present application is not limited to the above-described embodiment, and can be variously modified in an implementation stage without departing from the scope of the invention. In addition, the respective embodiments may be combined as appropriate as much as possible, in which case the combined effects can be obtained. Further, the embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, the problems described in the section of the problem to be solved by the invention can be solved, and the effects described in the section of the effect of the invention If you get
A configuration in which this component is deleted can be extracted as an invention.

[0148]

According to the present invention, the following information recording medium, information recording device, information recording method, information reproducing device, and information reproducing method can be provided.

(1) An information recording medium having a plurality of recording layers on one side and capable of highly accurate recording / reproducing on any of the recording layers.

(2) An information recording medium having excellent recording efficiency, particularly for seamless recording of a large amount of continuous data such as video data and recording of small data such as PC data in units of ECC blocks at arbitrary positions. Excellent information recording medium.

(3) Information is recorded on an information recording medium having a plurality of recording layers on one side and capable of highly accurate recording / reproducing on any recording layer so that the characteristics of the information recording medium can be exhibited. Information recording apparatus and information recording method.

(4) An information recording medium having excellent recording efficiency, particularly for seamless recording of a large amount of continuous data such as video data and recording of small data such as PC data in units of ECC blocks at arbitrary positions. An information recording apparatus and an information recording method for recording information on an excellent information recording medium so that the characteristics of the information recording medium can be exhibited.

(5) An information reproducing apparatus and an information reproducing method for reproducing data recorded on an information recording medium having a plurality of recording layers on one side and capable of recording and reproducing with high accuracy in any recording layer.

(6) An information recording medium having excellent recording efficiency, particularly for seamless recording of a large amount of continuous data such as video data and recording of small data such as PC data in small ECC block units at arbitrary positions. An information reproducing apparatus and an information reproducing method for reproducing data recorded on an excellent information recording medium.

[Brief description of drawings]

FIG. 1 is a diagram showing an optical disc according to an example of an information recording medium of the present invention, and particularly a diagram showing a spiral track, an index header and a dummy area provided on this optical disc.

FIG. 2 shows an optical disc with no dummy area,
It is sectional drawing cut | disconnected along the track containing an index header.

FIG. 3 is a diagram showing a change in light transmittance of the first recording layer when scanning irradiation light along a track in the cross section shown in FIG. 2;

FIG. 4 is a cross-sectional view of the optical disc shown in FIG. 1 cut along a track including an index header, showing an example of the arrangement of dummy areas.

5 is a diagram showing a change in transmittance of the first recording layer when scanning irradiation light along a track in the cross section shown in FIG. 4;

FIG. 6 is a diagram showing an example of arrangement of dummy areas.

FIG. 7 is a diagram showing a spiral track, an index header and a dummy area provided on the optical disc shown in FIG. 1 in an enlarged manner, and also showing a recording field, a sub-recording field and the like recorded on the spiral track.

8 is a diagram showing a data structure of an index header provided on the optical disc shown in FIG.

9 is a diagram showing a data structure of a data frame forming an ECC block recorded for a recording field and a sub-recording field recorded on a spiral track provided on the optical disc shown in FIG.

10 is a diagram showing a relationship between a recording field and a sub recording field recorded on a spiral track provided on the optical disc shown in FIG. 1, and a data structure of the sub recording field (with a connection area).

11 is a diagram showing a relationship between a recording field and a sub-recording field recorded on a spiral track provided on the optical disc shown in FIG. 1, and also showing a data structure of the sub-recording field (without a connection area).

12 is a diagram showing a data structure of a data frame forming an ECC block recorded for a recording field and a sub-recording field recorded on a spiral track provided on the optical disc shown in FIG.

13 is a diagram showing a data structure of an ECC block recorded in a recording field and a sub-recording field recorded on a spiral track provided on the optical disc shown in FIG.

14 is a diagram showing a data structure after interleaving of ECC blocks recorded in a recording field and a sub-recording field recorded in a spiral track provided on the optical disc shown in FIG.

FIG. 15 is a diagram showing a data structure of a recording frame after a sync code (2 bytes) is added.

16 is a diagram showing various parameters in each zone defined in the optical disc shown in FIG.

FIG. 17 is a diagram showing each recording field recorded on each track of zone 0.

FIG. 18 is a diagram showing an example of an arrangement method of training patterns to be arranged in a dummy area.

FIG. 19 is a diagram showing an example of a method of arranging training patterns to be arranged in the adjustment area.

FIG. 20 is a diagram showing an example of a method for manufacturing an optical disc of the present invention.

FIG. 21 is a diagram showing an example of a mark for attachment provided on the optical disc of the present invention.

22 is a diagram showing how to use the indicia shown in FIG. 21 in a laminating process which is a process of manufacturing the optical disc of the present invention.

FIG. 23 is a diagram showing an outline of an optical disc drive device according to an example of an information recording device and an information reproducing device of the present invention.

FIG. 24 is a diagram showing an outline of an optical disk drive device according to an example of an information reproduction-only device of the present invention.

25 is a flowchart showing a data recording process (recording of a recording field) that occurs when the optical disc shown in FIG. 1 is physically formatted.

FIG. 26 is a flowchart showing a recording process for recording user data on a physically formatted optical disc.

FIG. 27 is a flowchart showing a reproducing process for reproducing user data from an optical disc on which user data is recorded.

[Explanation of symbols]

10 ... Optical disc 11 ... Clamp hole 12 ... Index header 13 ... Groove track 14 ... Land truck 15 ... Recording field 16 ... Sub recording field a 17 ... Sub recording field b 18 ... Wobble signal 19 ... Header field 20 ... Data field 30 ... Ha header 31 ... Hb header 32 ... Hc header 33 ... Hd header 34 ... VFO 35 ... Ha 36 ... Hb 37 ... Hc 38 ... Hd 40 ... Front 41 ... DATA 42 ... rear 43 ... Sub data field 44 ... DATAa 45 ... Sub data field 46 ... DATAb 100 ... Spindle motor 101 ... Clamper 110 ... Optical head 111 ... Objective lens 112 ... Focused beam 113 ... Optical system 114 ... LD / PD 115 ... F / T / R-ACT 120 ... Playback amplifier 130 ... Signal processing 140 ... Data processing 150 ... Formatter / Recording control / Servo control 160 ... LD driver 170 ... ACT driver 180 ... Motor driver 190 ... Interface 201 ... dummy area 202 ... Lead-in area (embossed area) 203 ... Lead-in area (rewrite area) 204 ... Lead-out area 211 ... Substrate 212 ... Middle layer 214 ... First recording layer 215 ... Second recording layer 216 ... Section 1a 217 ... section 1b 218 ... Section 2a 219 ... Section 2b 220 ... section 2c 221 ... Embossed pit 222 ... Irradiation light 223 ... Defocus spot 231 ... Training pattern 232 ... Truck 233 ... Resist film 234 ... Original plate 235 ... Stamper mold 236 ... Resin molded substrate 237 ... Recording layer 238 ... Sign

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-3-219440 (JP, A) JP-A-2002-92939 (JP, A) JP-A-2001-14684 (JP, A) JP-A-9-16973 ( JP, A) JP-A-8-212561 (JP, A) International publication 00/016320 (WO, A1) International publication 00/023990 (WO, A1) (58) Fields investigated (Int.Cl. ⁷ , DB name) ) G11B 7/00-7/013 G11B 7/24 G11B 20/12

Claims (11)

(57) [Claims] 1. A disc-shaped information recording medium having a plurality of recording layers stacked, each recording layer having a plurality of concentric zones, and a spiral track including a plurality of turns in each zone. And one index header aligned in the radial direction of the disc so as to block a part of the spiral track, the spiral track has a wobble, and the spiral track has a plurality of recording fields. Each recording field has a header field in which rewritable address data is recorded according to a format and a data field in which target data is recorded, and the index header is recorded in each track by embossed pits. Address data, of the plurality of recording fields The specific recording field is arranged across the index header, and the specific recording field has first and second sub recording fields with the index header as a boundary, and the first sub recording field is A first header field and a first sub-data field, the second sub-recording field has a second header field and a second sub-data field, the first and second headers The same address data is recorded in the field, the number of wobbles per spiral track included in a specific zone is the same, and based on the frequency reproduced from the wobbles of the spiral track, the data for this specific zone is recorded. Allows you to determine the disk rotation speed during access, as well as data for this particular zone. It makes it possible to determine the frequency for recording, receives the light beam emitted from one side of this information recording medium, and records data on the spiral track provided on the target recording layer and is provided on the target recording layer. An information recording medium characterized by being capable of reproducing data recorded on a spiral track. 2. The information recording medium according to claim 1, wherein a dummy area is arranged between the index header and the recording field. 3. Each recording layer has a predetermined embossed field in which data is recorded by embossed pits, and a mirror field, and between the index header and the recording field,
2. The information recording medium according to claim 1, wherein dummy areas are arranged between the predetermined emboss field and the recording field and between the mirror field and the recording field, respectively. 4. A disc-shaped information recording medium having a plurality of stacked recording layers, each recording layer having a plurality of concentric zones, and a spiral track including a plurality of turns in each zone. And one index header aligned in a radial direction of the disc so as to block a part of the spiral track, the spiral track has a wobble, and the index header is recorded by an embossed pit. An information recording device that has address data of each track and records data on the information recording medium, which is provided on a target recording layer by irradiating a light beam from one surface of the information recording medium. Recording means for recording data on the spiral track, wherein the recording means includes a header on the spiral track. When a plurality of recording fields having fields and data fields are continuously recorded, rewritable address data depending on the format is recorded in the header field, target data is recorded in the data field, and the index header is further recorded. A specific recording field is recorded across the index header, and the specific recording field has first and second sub-recording fields with the index header as a boundary, and each of the first and second sub-recording fields is An information recording apparatus having the header field and the data field, wherein the recording means records the same address data in the header field of each of the first and second sub-recording fields. 5. Each recording layer has a predetermined embossed field in which data is recorded by embossed pits, and a mirror field, and between the index header and the recorded field,
Between the predetermined emboss field and the recording field, and between the mirror field and the recording field, each has a dummy area, the recording means records a training pattern in the dummy area, The information recording apparatus according to claim 4, wherein: 6. A disc-shaped information recording medium having a plurality of recording layers laminated, each recording layer comprising a plurality of concentric zones, and a spiral track including a plurality of turns in each zone. And one index header aligned in a radial direction of the disc so as to block a part of the spiral track, the spiral track has a wobble, and the index header is recorded by an embossed pit. An address recording of each track, irradiating a light beam from one surface of the information recording medium, the information recording method for recording data on a spiral track provided in a target recording layer, Record multiple recording fields with header and data fields in succession on the spiral track. In this case, the header field records rewritable address data according to a format, the data field records target data, and
A specific recording field is recorded across the index header, and the specific recording field has first and second sub-recording fields with the index header as a boundary, and the first and second sub-recording fields are recorded. Each of the fields has the header field and the data field, and the same address data is recorded in the header field of each of the first and second sub-recording fields. 7. Each recording layer has a predetermined embossed field in which data is recorded by embossed pits, and a mirror field, and between the index header and the recording field,
A dummy area is provided between the predetermined emboss field and the recording field and between the mirror field and the recording field, and a training pattern is recorded in the dummy area. The information recording method according to claim 6. 8. A disc-shaped information recording medium having a plurality of recording layers stacked, each recording layer having a plurality of concentric zones, and a spiral track including a plurality of turns in each zone. And one index header aligned in the radial direction of the disc so as to block a part of the spiral track, the spiral track has a wobble, and the spiral track has a plurality of recording fields. Each recorded field has a header field in which rewritable address data according to the format is recorded, and a data field in which target data is recorded,
The index header has address data of each track recorded by embossed pits, a specific recording field of the plurality of recording fields is arranged across the index header, and the specific recording field is A first sub-recording field having a first header field and a first sub-data field, and the second sub-recording field having the first header field and the second sub-recording field. The sub-recording field has a second header field and a second sub-data field, the same address data is recorded in the first and second header fields, and the data recorded in the information recording medium is recorded. Is an information reproducing apparatus for reproducing an information recording medium, irradiating a light beam from one surface of the information recording medium, An information reproducing apparatus comprising: reproducing means for reproducing data recorded on a spiral track provided on a target recording layer. 9. Each recording layer has a predetermined embossed field in which data is recorded by embossed pits, and a mirror field, and between the index header and the recording field,
Between the predetermined emboss field and the recording field, and between the mirror field and the recording field, there are dummy areas in which a training pattern is recorded, and the reproducing means includes the dummy area from the dummy area. The information reproducing apparatus according to claim 8, wherein the training pattern is reproduced. 10. A disc-shaped information recording medium having a plurality of recording layers stacked, each recording layer having a plurality of concentric zones, and a spiral track including a plurality of turns in each zone. And one index header aligned in the radial direction of the disc so as to block a part of the spiral track, the spiral track has a wobble, and the spiral track has a plurality of recording fields. Each recording field has a header field in which rewritable address data is recorded according to a format and a data field in which target data is recorded, and the index header is recorded in each track by embossed pits. Address data, of the plurality of recording fields The specific recording field is arranged across the index header, and the specific recording field has first and second sub-recording fields with the index header as a boundary. Has a first header field and a first sub-data field, the second sub-record field has a second header field and a second sub-data field, and the first and second The same address data is recorded in the header field, which is an information reproducing method for reproducing the data recorded in the information recording medium. An information reproducing method characterized by reproducing data recorded on a spiral track provided in a layer. 11. Each recording layer has a predetermined embossed field in which data is recorded by embossed pits, and a mirror field, and between the index header and the recording field,
A dummy area in which a training pattern is recorded is provided between the predetermined emboss field and the recording field, and between the mirror field and the recording field, and the training pattern is reproduced from the dummy area. The information reproducing method according to claim 10, wherein: