JP2001076349A - Optical recording medium and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make illegal recording/reproducing of information data impossible by providing groove tracks with plural groove parts cut into pieces in the rotating direction of an optical recording medium by groove non-forming parts and including one of the groove non-forming parts in each of mark parts or each of space parts. SOLUTION: Groove tracks 12 are formed as the part of the same depth (the same plane) as land tracks 13, i.e., intermittent groove tracks divided by a groove non-forming part excepting the vicinity of the re-pit column consisting of three pre-pits 14A, 14B, 14C. The length of individual groove parts and groove non-forming parts (mirror part) is equivalent to the length of a pit and the interval of the pit formed by information recording, and each of the groove parts corresponds to the mark (or space) of information data. Thus, the level of the reproducing RF signal of a control data part becomes low at the time of reproducing, and consequently reproducing of control data becomes impossible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording medium and a method for manufacturing the same, and more particularly, to an optical recording medium which can be recorded by a user, and which cannot improperly record and reproduce information data. It relates to the manufacturing method.

[0002]

2. Description of the Related Art At present, as an optical recording medium, a recordable DVD-R (Digital Versatile Disc) which can be recorded by a user and has a recording capacity of several gigabytes (Gbytes) is available.
Recordable) and rewritable DVD-RW (D
VD-Rewritable) is being developed. In addition, the remarkable performance improvement of such a large-capacity digital optical recording medium and recording / reproducing apparatus makes it possible to perform high-capacity large-capacity duplication with little deterioration.

FIG. 1 is a diagram showing a layout of physical sectors in a recording surface radial direction, taking a DVD-RW as an example. In an information area for recording information data, a lead-in area, a data area, and a lead-out area are sequentially formed radially outward from a start point of the information area (a start point of a physical sector). As shown in FIG. 2, the lead-in area includes data for reproducing the disc, such as reference codes and control data. The control data area has 192 ECCs (Error Correction Codes).
e) Consists of blocks. In FIG. 2, the configuration of the ECC block in the control data area is 0 to 15
Are shown using the relative sector numbers of These ECC
The contents of each of the blocks are all identical. That is, 192 ECC blocks having the same content are continuously recorded. The ECC block is composed of 16 sectors, and each ECC block records physical format information, disc manufacturing information, and content provider information. Therefore, at the time of recording information data, data related to these reproductions is recorded in the control data area of the lead-in area. At the time of reproduction of this disc, the reproducing device reads these data and, based on the read information, reproduces such data as video data. By executing the reproduction of the recording information data, the recording and the reproduction of the disc are performed.

[0004] However, as described above, since high-quality and large-capacity copying can be easily performed, a copy for preventing illegal or illegal copying of recorded information data such as video / audio data and computer programs. The development of protection technology has become an important issue.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide an optical recording medium which does not allow illegal recording and reproduction of information data and a method of manufacturing the same. Aim.

[0006]

According to the present invention, there is provided an optical recording medium comprising: a groove track for alternately displaying a mark portion and a space portion for recording an information data signal; and at least one pre-pit for carrying prerecorded information. An optical recording medium having an information data recording area in which a pre-pit row including a land track formed in advance for each predetermined data unit of a groove track and an alternately formed land track,
At least a part of the groove track has a plurality of groove portions separated in the rotational direction of the optical recording medium by the non-groove portions, and each of the mark portions or each of the space portions corresponds to one of the non-groove portions. It is characterized by including.

In the optical recording medium according to the present invention, a pre-pit row including at least one pre-pit carrying pre-recorded information and a groove track serving as a mark portion and a space portion appearing alternately for recording an information data signal are provided. And a land track formed in advance for each predetermined data unit, and an optical recording medium having an information data recording area alternately formed, wherein at least a part of the groove track is optically formed by a non-groove portion. It has a plurality of groove portions divided in the rotation direction of the recording medium, each of the mark portions or each of the space portions includes one of the non-groove forming portions, and is adjacent to the pre-pit row.
At least one of the groove tracks composed of a plurality of groove portions has at least one prepit included in the prepit row in the rotation direction of the optical recording medium, and has at least a continuous groove portion from the start end to the end. I have.

In the optical recording medium according to the present invention, a pre-pit row including at least one pre-pit carrying pre-recorded information and a groove track serving as a mark portion and a space portion appearing alternately for recording an information data signal is formed by a groove track. And a land track formed in advance for each predetermined data unit, and an optical recording medium having an information data recording area alternately formed, wherein at least a part of the groove track is optically formed by a non-groove portion. It has a plurality of groove portions divided in the rotation direction of the recording medium, each of the mark portions or each of the space portions includes one of the non-groove forming portions, and is adjacent to the pre-pit row.
At least one of the groove tracks composed of the plurality of groove portions has at least one prepit included in the prepit row in the rotation direction of the optical recording medium, and has at least one groove non-forming portion continuous from the start end to the end. Features.

In the optical recording medium according to the present invention, a pre-pit row including at least one pre-pit carrying pre-recorded information and a groove track carrying alternating mark portions and space portions for recording an information data signal is formed by a groove track. And a land track formed in advance for each predetermined data unit, and an optical recording medium having an information data recording area alternately formed, wherein at least a part of the groove track is optically formed by a non-groove portion. It has a plurality of groove portions divided in the rotation direction of the recording medium, each of the mark portions or each of the space portions includes one of the non-groove forming portions, and is adjacent to the pre-pit row.
Of the groove tracks composed of a plurality of groove portions
Has at least one pre-pit included in the pre-pit row in the rotation direction of the optical recording medium, having at least a continuous groove portion from the beginning to the end, and the other one adjacent groove track includes a rotating groove of the optical recording medium. It is characterized in that it has a groove non-forming portion that is continuous from at least the beginning to the end of one prepit in the direction.

A method of manufacturing an optical recording medium according to the present invention is a method of manufacturing an optical recording medium having an information data recording area, wherein an alternating mark portion and space portion for recording an information data signal are provided. And a step of alternately forming land tracks having a prepit row including at least one prepit for each pre-recorded information for each predetermined data unit of the groove track. Forming the groove tracks includes forming, in at least a part of the groove tracks, a plurality of groove portions separated in the rotational direction of the optical recording medium by the non-groove forming portions, each of the mark portions or the spaces. Wherein each of the portions includes one of the non-groove forming portions That.

A method of manufacturing an optical recording medium according to the present invention is a method of manufacturing an optical recording medium having an information data recording area, wherein an alternately appearing mark portion and space portion for recording an information data signal are provided. And a step of alternately forming land tracks having a prepit row including at least one prepit for each pre-recorded information for each predetermined data unit of the groove track. Forming the groove tracks includes forming, in at least a part of the groove tracks, a plurality of groove portions separated in the rotational direction of the optical recording medium by the non-groove forming portions, each of the mark portions or the spaces. Each of the parts includes one of the non-groove forming parts, and Two of the at least one of the groove track in contact, at least one prepit included in the prepit train is characterized in that a groove portion that is continuous over the end of at least the starting end.

A method of manufacturing an optical recording medium according to the present invention is a method of manufacturing an optical recording medium having an information data recording area, wherein an alternately appearing mark portion and space portion for recording an information data signal are formed. Forming a groove track that carries the pre-recorded information, and alternately forming a land track having a prepit row including at least one prepit for each predetermined data unit of the groove track, The step of forming a groove track includes a step of forming, in at least a part of the groove track, a plurality of groove sections divided in a rotation direction of the optical recording medium by a non-groove section, each of the mark sections or the space section. Each include one of the non-groove forming portions and are adjacent to the pre-pit row. Two of the at least one of the groove track, at least one prepit included in the prepit train is characterized in that at least over from the beginning to the end continuous groove-free portion.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 3 is a perspective view showing the structure of a recording surface of a conventional recordable optical recording medium, taking a DVD-RW as an example. In FIG. 3, an optical disk (DVD
-RW) 11 is a phase change material as the data recording layer (e.g., information data having a multi-layer 15 composed of the protective layer of the recording layer and glassy sandwiching the composed of GeSbTe or the like) (ZnS-SiO ₂₎ A rewritable phase-change type optical disc having a groove track 12 as an information recording track.
And a land track 13 as a guide track for guiding a light beam (B) such as a laser beam as a reproduction light or a recording light on the groove track 12. Further, it has a reflective layer 16 for reflecting the light beam (B) when reproducing recorded data, and an adhesive layer 19 for adhering these to a transparent substrate (polycarbonate) 18. Further, a transparent film (polycarbonate) for protecting the light beam (B) on the incident surface side thereof.
17 are provided. The land track 13 has pre-pits 14 corresponding to pre-information (pre-recorded information). The pre-pits 14 carry pre-information used by the information recording / reproducing apparatus at the time of recording / reproducing, that is, an address for recognizing a position on the groove track 12 and synchronization information, and are formed in advance before the optical disc 11 is shipped. Things.

Further, in the optical disk 11, the groove track 12 is wobbled at a frequency corresponding to the disk rotation speed. The wobbled groove tracks 12 are formed before shipping the optical disk 11 in the same manner as the pre-pits 14 described above. When recording information data (information information other than pre-information, such as image information to be originally recorded; the same applies hereinafter) is recorded on the optical disk 11, the wobbling frequency of the groove track 12 is extracted by an information recording device. The rotation control of the optical disk 11 is performed at a predetermined rotation speed, and pre-information is obtained in advance by detecting the pre-pits 14. Based on the pre-information, the optimal output of the light beam (B) as the recording light is set, and the recording is performed. Address information or the like indicating the position on the optical disk 11 where the information data is to be recorded is obtained, and the record information data is recorded at the corresponding recording position based on the address information.

At the time of recording the recording information data, a light beam (B) is irradiated so that the center thereof coincides with the center of the groove track 12, and a recording information pit corresponding to the recording information data is formed on the groove track 12. The recording information data is recorded by forming. At this time, as shown in FIG. 3, the size of the light spot (SP) is partially not only the groove track 12 but also the land track 13.
Is also set to be irradiated.

Using a part of the light spot (SP) reflected on the land track 13 as reflected light, for example, a push-pull method (using a dividing line parallel to the tangential direction of the groove track 12, that is, the rotation direction of the optical disk 11). By a push-pull method (hereinafter, referred to as a radial push-pull method) using the divided photodetectors, pre-information is detected from the pre-pits 14, the pre-information is obtained, and a wobble signal is extracted from the groove track 12. Thus, a recording clock signal synchronized with the rotation of the disk is obtained.

Next, the recording format of the pre-information prerecorded on the optical disk 11 will be described with reference to FIG. In FIG. 4, the upper part shows the recording format of the recording information data, and the lower part shows the wobbling state of the groove track 12 (the plan view of the groove track 12) for recording the recording information data. The upward arrow during the wobbling state of the track 12 schematically indicates the position where the prepit 14 is formed. Here, in FIG. 4, the wobbling state of the groove track 12 is shown using an amplitude larger than the actual amplitude for easy understanding. Note that the record information data is recorded on the center line of the groove track 12.

As shown in FIG. 4, recording information data recorded on the optical disk 11 is divided in advance into sync frames as information units. One recording sector is formed by 26 sync frames, and one EC is formed by 16 recording sectors.
A C block is formed. One sync frame has a length of 1488 times (1488T) a channel bit length (hereinafter, referred to as T) defined by a recording format when recording the recording information data.
Further, the leading 32T length portion of one sync frame is used as synchronization information SY for synchronizing each sync frame.

On the other hand, the pre-information recorded on the optical disk 11 is recorded for each sync frame. Here, when pre-information is recorded on the optical disk 11 by the pre-pits 14, the synchronization signal in the pre-information is shown on the land track 13 adjacent to the area where the synchronization information SY in each sync frame in the recording information is recorded. As a result, one pre-pit 14 is always formed,
On the land track 13 adjacent to the first half of the sync frame other than the synchronization information SY, 2 or 1 pre-pits 14 are formed to indicate the contents of the pre-information to be recorded. However, the pre-pit 14 may not be formed in the first half of the sync frame other than the above depending on the content of the pre-information to be recorded. At this time, usually, pre-pits 14 are formed only in even-numbered sync frames (hereinafter, referred to as EVEN frames), and pre-information is recorded (exceptions will be described later). That is, in FIG. 4, the pre-pit 14 is formed in the EVEN frame (indicated by the solid line upward arrow in FIG. 4), but the pre-pit 14 is not formed in the ODD frame adjacent thereto. More specifically, EV
When the pre-pits are formed in the EN frame, all the pre-pits 14 (pre-pits B2, B1, and B0.) In the sync frame at the head of the recording sector.
Here, each of the pre-pits B from the beginning of the sync frame
2, B1 and B0. ) Is formed, and in a sync frame other than the head of the recording sector, when pre-information to be recorded in the sync frame is “1”, pre-pits B2 and B0 are formed, and information to be recorded is “0”. In this case, only the pre-pit B2 is formed. When a pre-pit is formed in the ODD frame, pre-pits B2 and B1 are formed in the sync frame at the head of the recording sector, and the sync frame other than the head of the recording sector is different from the EVEN frame in the sync frame other than the head of the recording sector. The same is true. That is, the pre-pit 14 is composed of the pre-pit trains B2, B
1, the meaning differs depending on the pattern of B0.

Whether the pre-pit 14 is formed in the sync frame of the EVEN frame or the ODD frame is determined depending on the position of the pre-bit 14 previously formed on the adjacent land track. That is, the pre-pits 14 are usually formed in the EVEN frame. However, when the pre-pits 14 are formed in the EVEN frame, the pre-pits 14 on the adjacent land track formed in advance are close to the pre-pits 14 in the radial direction of the optical disc 11. Then, pre-pits 14 are formed in the ODD frame. By forming in this manner, the pre-pit 1 is located at the adjacent land track position.
Since the number 4 does not exist, the influence of crosstalk can be reduced in detecting the pre-pit 14.

On the other hand, the groove track 12 is wobbled at a constant wobbling frequency f0 of 140 kHz (frequency at which eight wobble signals are included in one sync frame) over all sync frames. Then, in the information recording apparatus, by extracting the constant wobbling frequency f0, a signal for controlling the rotation of the spindle motor is detected, and a recording clock signal is generated.

Next, a first embodiment of the present invention will be described in detail with reference to FIG. FIG. 5 is a plan view schematically showing the groove track 12 and the land track 13 of the control data section in the lead-in area. First, the groove track 12 has three pre-pits 14
Except for the vicinity of the pre-pit row composed of A, 14B, and 14C, it is formed as a portion having the same depth (same plane) as the land track 13, that is, an intermittent groove track divided by a non-groove-forming portion. The groove track 12 is produced by, for example, 8/16 modulating the cutting light beam at the time of groove cutting, and turning the output power ON-OFF (duty ratio is about 50%). That is, the groove track 12 has an intermittent structure divided by a signal of the same frequency band as a recording RF signal (a recording signal after 8/16 modulation) to be recorded on the optical disc. This means that the lengths of the individual groove portions and the non-groove-formed portions (hereinafter, referred to as mirror portions) are equivalent to the lengths and pit intervals of pits formed by information recording. That is, each of the groove portions corresponds to a mark (or space) of the information data.

On the other hand, pre-pits 14A, 14B, 14C
In a track to be traced when reading is performed, a continuous groove 12A adjacent to at least all of the prepits 14A, 14B, and 14C is formed in a sync frame including these prepits. That is, the groove 12A is at least the beginning of the pre-pit row in the tracking direction (the beginning of the pre-pit 14A).
To the end of the pre-pit row (the end of the pre-pit 14C). In this embodiment, the pre-pits 14A, 14B, 14
Another continuous groove 12B adjacent to the pre-pits 14A, 14B, 14C across C is formed.

When reproduction is performed after recording some 8/16 modulated information on the intermittent groove track having the above structure, the RF signal reproduced from the intermittent groove track has a small amplitude except for the area of the groove 12A. It cannot be read. This is because the intermittent (ON-OFF) of the groove track itself is in the same frequency band as the recorded RF signal, and thus interferes with each other. On the other hand, in the regions where the pre-pits 14A, 14B and 14C are formed, signal interference does not occur due to the continuous grooves 12A and 12B, so that the pre-information signal can be read. In addition, in the area of the groove 12A, it is necessary to be able to read other control signals (tracking error signal, wobble signal) in addition to the pre-pit signal. As mentioned above, about 50 for intermittent groove tracks
Since the groove exists at a duty ratio of%, the levels of the push-pull tracking error signal and the wobble signal are about 50% of the continuous groove, but sufficient tracking control is possible.

Therefore, even if the control data is recorded in the control data portion by forming the groove tracks intermittently in the control data portion of the lead-in area except for the region adjacent to the pre-pit,
During reproduction, the level of the reproduced RF signal in this section becomes low, and as a result, reproduction of control data becomes impossible. That is, it is impossible to reproduce recorded information data such as image information to be recorded and reproduced originally, thereby preventing unauthorized copying. In addition, as a method for avoiding copy protection when copying is properly performed on the recording medium, various methods such as hardware or software such as an avoidance device and a computer program can be adopted.

Next, a second embodiment of the present invention will be described in detail with reference to FIG. FIG. 6 is a plan view schematically showing the groove track 12 and the land track 13 of the control data section in the lead-in area. This embodiment is different from the first embodiment in that the pre-pit 14
A point that at least a region adjacent to all regions of the pre-pits 14A, 14B, and 14C is formed as a continuous mirror portion 22A on a track to be traced when reading A, 14B, and 14C. That is, the mirror unit 22
A is formed continuously from at least the beginning of the pre-pit 14A in the tracking direction to the end of the pre-pit 14C. In the present embodiment, the pre-pits 14A, 14B, and 14C are further sandwiched between the pre-pits 14A, 14B, and 14C.
Another mirror unit 22B adjacent to A, 14B, and 14C is configured.

Therefore, in the same manner as in the first embodiment, with the above-described configuration, the reproduction RF signal from the recording area of the intermittent groove track can be turned ON-O of the groove track itself.
Reading is not possible due to the interference between the FF and the recorded RF signal. On the other hand, in the areas adjacent to the pre-pits 14A, 14B and 14C, the pre-information can be read by the continuous mirror sections 22A and 22B.

It is apparent that the continuous groove and the continuous mirror section of the first and second embodiments may be used in combination. For example, the pre-pits 14A, 14B, 14
On a track to be traced when reading C, at least a continuous groove 12A adjacent to all regions of the pre-pits 14A, 14B, and 14C is formed.
Pre-pits 14A, 14 sandwiching 4A, 14B, 14C
The mirror portion 22B may be formed adjacent to B and 14C.

Next, a third embodiment and a fourth embodiment of the present invention will be described with reference to FIGS. FIGS. 7 and 8 are plan views schematically showing the groove track 12 and the land track 13 of the control data section in the lead-in area. As shown in FIG. 7, the third embodiment is different from the above-described embodiment in that the pre-pit 14
At least the pre-pits 14A, 14B, 14
The point is that a continuous groove 12A adjacent to all the regions C is formed. Even in such a configuration, since the continuous groove 12A does not cause signal interference in this section, pre-information can be read.

FIG. 8 shows a case where two prepits 14 are formed in a sync frame other than the head of a recording sector (prepits B2 and B0 or prepits B2).
2 and B1) are shown as examples. In this embodiment,
A continuous mirror portion 22A is formed in place of the continuous groove 12A. In this case, the same effect as in the third embodiment can be obtained.

Next, a fifth embodiment and a sixth embodiment of the present invention will be described with reference to FIGS. Fifth
The sixth embodiment differs from the above-described embodiment in that only one pre-pit 14A is formed. Even in these cases, at least the pre-pit 14A is included in the track traced when reading the pre-pit 14A.
A signal is formed by forming a continuous groove 12A (FIG. 9) or a continuous mirror portion 22A (FIG. 10) continuous from the start to the end of the pre-pit 14A in the tracking direction, that is, adjacent to all sections where A is formed. Pre-information can be read while avoiding interference.

Next, a seventh embodiment of the present invention will be described below. As shown in FIG. 11, the control data section in the lead-in area is
And a land track 13. The groove track 12 is divided into a plurality of groove sections 12C by a mirror section 22C, as in the case of the above-described embodiment.

In this embodiment, each groove portion 12C
Consists of a basic pit portion 31 and an extension portion 32.
The basic pit section 31 has a pit length corresponding to a mark (or space) of information data. As a modulation method, for example, when 8/16 modulation for converting 8-bit data to 16-channel bit data is used, the minimum pit length of the basic pit portion 31 is 3T, and the maximum pit length is 11T. Here, T is the channel bit length at the time of recording, as described in the first embodiment.
When a pit having a length of 14T is used as the synchronization pattern, the maximum pit length is 14T.

First, when forming the groove track 12 by dividing it into a plurality of groove portions 12C, the duty ratio of all the basic pit portions 31 in the groove track 12 in the control data portion is substantially the same as in the above-described embodiment. It is determined to be 50%. Furthermore,
In this embodiment, in order to improve the light detection signal level in the push-pull method (hereinafter, simply referred to as a push-pull signal level), an extension 32 (groove forming part) having a predetermined length is added to each basic pit part 31. To form a groove portion.

FIG. 12 shows a change in the push-pull signal level with respect to the length of the extension 32. The push-pull signal level when no extension is added to the basic pit portion 31 is 0.142, but the push-pull signal level increases as the length of the extension increases. When the length of the extension is 3T, the push-pull signal level is improved to a sufficient level of 0.233. Although the push-pull signal level is increased by lengthening the extension part, there is a trade-off in which if the length is too long, the effect of making illegal recording and reproduction on the groove part 12C impossible is reduced.

The length of the extension 32, the basic pit 3
The duty ratio of 1 and the like can be appropriately changed in consideration of the light detection signal level and the like. In the above-described embodiment, the length of the extension portion is fixed. However, the length of the extension portion 32 may be determined according to the length of the mirror portion 22C following the basic pit portion 31. For example, the length of the extension added to the basic pit may be a predetermined ratio of the length of the mirror following the basic pit. Further, it may have a pre-pit having the same configuration as that of the first to sixth embodiments.

Therefore, according to the present invention, by adding an extension portion 32 of a predetermined length to each basic pit portion 31, it is possible to prevent improper recording / reproduction, improve the push-pull signal level, and improve the tracking performance. Can be. still,
The continuous groove or the continuous mirror section shown in the above-described embodiment may be used in an appropriate combination.

In the above-described embodiment, the case where the groove track 12 is divided by a signal having the same band as the recording RF signal of the optical disk has been described as an example.
The signal may be divided by a signal including a part of the band of the F signal. Furthermore, in the above-described embodiment, the DVD-RW is described as an example of the optical recording medium. However, the present invention is not limited to this, and can be applied to other optical recording media such as a DVD-R.

[0039]

As is apparent from the above description, according to the present invention, in the control data section of the lead-in area, the groove tracks are formed intermittently except for the area adjacent to the pre-pits, whereby the control data section is formed. However, even if control data is recorded on the optical disk, the reproduction of the control data becomes impossible, and an optical recording medium that can prevent unauthorized copying of recorded information data can be realized. In addition, by providing an intermittent groove track having a structure according to the present invention, not limited to the control data section in the lead-in area, it is possible to prohibit reading of a reproduced RF signal from an arbitrary portion of the optical disk.

[Brief description of the drawings]

FIG. 1 is a diagram showing a layout of physical sectors in a recording surface radial direction of a recordable or rewritable DVD.

FIG. 2 is a diagram showing a configuration of a lead-in area and a control data area.

FIG. 3 is a perspective view showing a structure of a control data area in a conventional DVD-RW.

FIG. 4 is a diagram for explaining a frame configuration and a pre-pit of a physical sector.

FIG. 5 is a plan view schematically showing a groove track and a land track of a control data section according to the first embodiment of the present invention.

FIG. 6 is a plan view schematically showing a groove track and a land track of a control data section according to a second embodiment of the present invention.

FIG. 7 is a plan view schematically showing a groove track and a land track of a control data section according to a third embodiment of the present invention.

FIG. 8 is a plan view schematically showing a groove track and a land track of a control data section according to a fourth embodiment of the present invention.

FIG. 9 is a plan view schematically showing a groove track and a land track of a control data section according to a fifth embodiment of the present invention.

FIG. 10 is a plan view schematically showing a groove track and a land track of a control data part according to a sixth embodiment of the present invention.

FIG. 11 is a plan view schematically showing a configuration of a groove track and a land track of a control data section according to a seventh embodiment of the present invention.

12 is a graph showing a change in a push-pull signal level with respect to a length of an extension shown in FIG. 11;

[Explanation of Signs of Main Parts]

 DESCRIPTION OF SYMBOLS 11 DVD-RW 12 Groove track 12A, 12B Continuous groove 12C Groove part 13 Land track 14, 14A, 14B, 14C Prepit 15 Multi layer 16 Reflection layer 17 Transparent film 18 Transparent substrate 19 Adhesive layer 22A, 22B, 22C Mirror part 31 Basic Pit 32 Extension

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masahiro Kato 4-2610 Hanazono, Tokorozawa-shi, Saitama Prefecture Pioneer Corporation Inside the Tokorozawa Plant (72) Inventor Akishi Taniguchi 4-2610 Hanazono, Tokorozawa-shi, Saitama Pioneer Corporation F-term in Tokorozawa factory (reference) 5D029 WA02 WA27 WA28 WD30 5D090 AA01 BB03 BB04 CC14 DD03 FF09 GG03 GG26 GG27

Claims (16)

[Claims] 1. A pre-pit string including at least one pre-pit carrying prerecorded information and a groove track serving as a mark portion and a space portion appearing alternately for recording an information data signal are provided for each predetermined data unit of the groove track. An optical recording medium having an information data recording area in which land tracks formed in advance are alternately formed, and at least a part of the groove track is rotated by the non-groove portion. An optical recording medium, comprising: a plurality of groove portions separated in a direction, wherein each of the mark portions or each of the space portions includes one of the non-groove portions. 2. A pre-pit string including at least one pre-pit carrying pre-recorded information and a groove track serving as a mark portion and a space portion appearing alternately for recording an information data signal are provided for each predetermined data unit of the groove track. An optical recording medium having an information data recording area in which land tracks formed in advance are alternately formed, and at least a part of the groove track is rotated by the non-groove portion. A plurality of groove portions divided in a direction, each of the mark portions or each of the space portions includes one of the non-groove forming portions, and a plurality of the groove portions adjacent to the pre-pit row are formed from two of the plurality of groove portions. At least one of the groove tracks is formed by the pre-pit in the rotation direction of the optical recording medium. An optical recording medium, characterized in that at least one prepit included in a row of grooves has a continuous groove portion from at least the start end to the end. 3. A pre-pit string including at least one pre-pit carrying pre-recorded information and a groove track serving as a mark portion and a space portion alternately appearing for recording an information data signal, and a pre-pit row including at least one pre-pit is provided for each predetermined data unit of the groove track. An optical recording medium having an information data recording area in which land tracks formed in advance are alternately formed, and at least a part of the groove track is rotated by the non-groove portion. A plurality of groove portions divided in a direction, each of the mark portions or each of the space portions includes one of the non-groove forming portions, and a plurality of the groove portions adjacent to the pre-pit row are formed from two of the plurality of groove portions. At least one of the groove tracks is formed by the pre-pit in the rotation direction of the optical recording medium. An optical recording medium, characterized in that at least one prepit included in the array has a non-groove-forming portion that is continuous from at least the beginning to the end. 4. A pre-pit string including at least one pre-pit carrying prerecorded information and a groove track serving as a mark portion and a space portion appearing alternately for recording an information data signal is provided for each predetermined data unit of the groove track. An optical recording medium having an information data recording area in which land tracks formed in advance are alternately formed, and at least a part of the groove track is rotated by the non-groove portion. A plurality of groove portions divided in a direction, each of the mark portions or each of the space portions includes one of the non-groove forming portions, and a plurality of the groove portions adjacent to the pre-pit row are formed from two of the plurality of groove portions. Of the groove tracks included in the pre-pit row in the rotation direction of the optical recording medium. At least one pre-pit has a continuous groove portion from at least the beginning to the end, and another one adjacent groove track extends from at least the beginning to the end of the one pre-pit in the rotation direction of the optical recording medium. An optical recording medium comprising a continuous non-groove portion. 5. The optical recording medium according to claim 1, wherein the information data recording area is a control data recording area for recording reproduction control data used for reproduction control. . 6. The optical recording medium according to claim 1, wherein the information data recording area is a lead-in area. 7. The division frequency band of the groove track includes at least a part of a frequency band of a modulation recording signal for recording the information data on the optical recording medium. The optical recording medium according to any one of the above. 8. The semiconductor device according to claim 1, wherein each of the plurality of groove portions includes a basic pit portion corresponding to the mark portion or the space portion, and a groove forming portion having a predetermined length. 4. The optical recording medium according to item 1. 9. When the duty ratio of all basic pits in the information data recording area is about 50%, the predetermined length is about three times or less a channel bit length of the information data. The optical recording medium according to claim 8, wherein 10. Each of the plurality of groove portions has a predetermined pit portion corresponding to the mark portion or the space portion and a pit length corresponding to the space portion or the mark portion following the mark portion or the space portion. The optical recording medium according to any one of claims 1 to 7, comprising a groove forming portion having a ratio length. 11. The optical recording method according to claim 1, wherein each of the mark portions or each of the space portions includes one of the non-groove forming portions and a groove forming portion. Medium. . 12. The optical recording medium according to claim 11, wherein the groove forming portion is continuous with a preceding mark portion or space portion. 13. A method of manufacturing an optical recording medium having an information data recording area, comprising the steps of: forming a groove track serving as an alternating mark portion and space portion for recording an information data signal; Forming alternately a land track having a pre-pit row including at least one pre-pit carrying recording information for each predetermined data unit of the groove track and the groove track, wherein the step of forming the groove track comprises: Forming at least part of the groove track a plurality of groove portions separated in the rotational direction of the optical recording medium by a non-groove portion, wherein each of the mark portions or each of the space portions is A method comprising one of said non-groove portions. 14. A method for manufacturing an optical recording medium having an information data recording area, comprising the steps of: forming a groove track having alternating mark portions and space portions for recording an information data signal; Forming alternately a land track having a pre-pit row including at least one pre-pit carrying recording information for each predetermined data unit of the groove track and the groove track, wherein the step of forming the groove track comprises: Forming at least part of the groove track a plurality of groove portions separated in the rotational direction of the optical recording medium by a non-groove portion, wherein each of the mark portions or each of the space portions is Including one of the non-groove forming portions, adjacent to the pre-pit row Do 2
At least one of the groove tracks is a continuous groove portion from at least a start end to an end in at least one prepit included in the prepit row. 15. A method for manufacturing an optical recording medium having an information data recording area, comprising the steps of: forming a groove track for alternately displaying a mark portion and a space portion for recording an information data signal; Forming alternately a land track having a pre-pit row including at least one pre-pit carrying recording information for each predetermined data unit of the groove track and the groove track, wherein the step of forming the groove track comprises: Forming at least part of the groove track a plurality of groove portions separated in the rotational direction of the optical recording medium by a non-groove portion, wherein each of the mark portions or each of the space portions is Including one of the non-groove forming portions, adjacent to the pre-pit row Do 2
At least one of the groove tracks is a non-groove forming portion that is continuous from at least a start end to an end in at least one prepit included in the prepit row. 16. The division frequency band of the groove track includes at least a part of a frequency band of a modulation recording signal for recording the information data in the groove portion. Or the method of item 1.