JP4445471B2 - Information recording medium - Google Patents

Description

  The present invention relates to the technical field of information recording media such as DVDs.

  For example, in an information recording medium such as an optical disc such as a CD-ROM (Compact Disc-Read Only Memory), a CD-R (Compact Disc-Recordable), and a DVD-ROM, a plurality of recording layers are laminated on the same substrate. Multilayer, double layer, or multiple layer type optical discs have also been developed. More specifically, the double-layer type optical disc is, as the first layer, the first layer located on the most front side (that is, the side closer to the optical pickup) when viewed from the laser beam irradiation side when recording by the information recording apparatus. It has one recording layer (referred to as “L0 layer” in this application as appropriate), and further has a transflective film located on the back side thereof (that is, the side far from the optical pickup). As the second layer, it has a second recording layer (referred to as “L1 layer” in this application as appropriate) located on the back side of the transflective film via an intermediate layer such as an adhesive layer, and further on the back side. A reflective film located on the surface. When producing such a multilayer information recording medium, the L0 layer and the L1 layer are formed separately, and finally, the two layers are bonded together, so that a two-layer type optical disc can be manufactured at low cost. Can be manufactured.

  In an information recording apparatus such as a CD recorder that records such a two-layer optical disc, the recording laser beam is focused (or irradiated) on the L0 layer, so that the L0 layer is focused on. Information is recorded by an irreversible change recording method such as heating, irreversible change recording method or rewritable method, and the laser beam is focused on the L1 layer, thereby heating the information on the L1 layer. Recording is performed by an irreversible change recording method such as irreversible change recording heating or a rewritable method. At this time, in order to control recording and reproduction of information, as described in Patent Document 1, a wobbled groove and a prepit formed between the grooves are used (see Patent Document 1). Further, in such an optical disc having a plurality of recording layers, as shown in Patent Document 2, management information for managing recorded data is recorded on any one of the recording layers. , Aiming for quick playback of data.

JP 9-326138 A JP 2003-168221 A

  In such an optical disc, when it is desired to focus laser light on a desired recording layer among a plurality of recording layers, the laser light may be focused on a recording layer different from the desired recording layer. . In particular, during a management information reading operation immediately after an optical disk is inserted into a player, a recorder, or the like, a different recording layer is often focused. In such a case, the address information and tracking information on the second layer are mistakenly recognized as those on the first layer, the pickup runs away toward the inner periphery of the optical disk, and as a result hits the stopper, etc. It has a technical problem. Furthermore, with existing players and recorders that do not support multi-layer optical disks, the pickup still runs away toward the inner periphery of the optical disk even if the focus is on another recording layer, resulting in a stopper. Or have a technical problem that data recording and reproduction operations are executed abnormally as they are.

  The present invention has been made in view of, for example, the conventional problems described above. For example, it is possible to appropriately record information on an information recording medium having a plurality of recording layers and to reproduce recorded data. It is an object of the present invention to provide an information recording medium.

In order to solve the above-described problems, an information recording medium of the present invention includes a first recording layer that records recording information by irradiating laser light, and irradiating the laser light through the first recording layer. An information recording medium comprising a second recording layer for recording the recording information, wherein the first recording layer faces a specific recording area for focusing the laser beam in one of the first and second recording layers. Control information for controlling the recording of the recording information is recorded in a recording area other than one recording area in the other of the first and second recording layers, and the other of the first and second recording layers, A groove for recording the recording information and a land adjacent to the groove are formed, and the groove in the recording area excluding at least the one recording area swings at a predetermined cycle and indicates the control information. A pre-pit indicating the control information is formed in the land in the recording area excluding at least the one recording area, and erroneous control information is provided in the land in the at least one recording area. Is formed .

  The operation and effect of the present invention will be clarified by the best mode for carrying out the invention shown below.

1 shows the basic structure of an optical disc according to a first embodiment of the information recording medium of the present invention, wherein the upper portion is a schematic plan view of an optical disc having a plurality of areas, and the lower portion associated therewith is in the radial direction thereof. It is a schematic conceptual diagram of an area structure. It is a partial expansion perspective view in the recording surface of the information recording medium which concerns on 1st Example. It is a data structure figure which shows notionally the data structure of the optical disk of an opposite track path among the information recording media based on 1st Example. It is a data structure figure which shows notionally one example of the data structure of the information recording medium which concerns on a comparative example. It is a data structure figure which shows notionally the other example of the data structure of the information recording medium which concerns on a comparative example. It is a top view which shows notionally one aspect of recording of the control information in the information recording medium which concerns on 1st Example. It is a top view which shows notionally the other aspect of recording of the control information in the information recording medium based on 1st Example. It is a graph which shows notionally the groove detection signal obtained by reading the control information recorded on the information recording medium based on 1st Example. It is a top view which shows notionally the other aspect of recording of the control information in the information recording medium based on 1st Example. It is a graph which shows notionally one specific example of the groove detection signal detected in 2nd Example which concerns on the information recording medium of this invention. It is a graph which shows notionally other specific examples of the groove detection signal detected in 2nd Example which concerns on the information recording medium of this invention. It is a data structure figure which shows notionally the data structure of 3rd Example based on the information recording medium of this invention. 1 is a block diagram of an information recording / reproducing apparatus according to an embodiment of the invention.

Explanation of symbols

1 Information recording apparatus 100 Optical disc 102, 112 Lead-in area 103, 113 Lead-out area 113a Area 104, 114 Middle area

  Hereinafter, an information recording medium according to an embodiment of the present invention as the best mode for carrying out the invention will be described.

(Embodiment of information recording medium)
In an embodiment of the information recording medium of the present invention, a first recording layer that records recording information by irradiating a laser beam, and the recording information is irradiated by irradiating the laser beam through the first recording layer. An information recording medium comprising a second recording layer for recording, wherein the first and second facing the specific recording area for focusing the laser beam on one of the first and second recording layers. For example, all control information for controlling the recording of the recording information is recorded in a recording area other than one recording area on the other recording layer.

  According to the embodiment of the information recording medium of the present invention, contents such as video information and music information, data information for computers, etc. in each of a plurality of recording layers (that is, the first recording layer and the second recording layer). It is possible to record various information including. The plurality of recording layers are formed in a laminated structure on one surface of the substrate, for example.

  In the present embodiment, in particular, in the first recording layer, control information is recorded in a recording area other than one recording area of the second recording layer facing a specific recording area where the laser light is focused. Here, “focus-in” in the present invention is intended to indicate an operation of, for example, irradiating a laser beam at the time of recording or reproducing recorded information to adjust the focus of the laser beam to a specific recording area. . In particular, it may indicate an operation in which the laser beam is focused at the beginning of the reproducing operation and the recording operation (specifically, after the information recording medium is loaded). Then, the control information necessary for recording is recorded almost only in the recording area excluding the one recording area. preferable. Preferably, no control information is recorded in the one recording area, and control information is recorded only in a recording area other than the one recording area.

  Therefore, for example, when an information recording / reproducing apparatus described later is used to focus on the first recording layer, for example, even if the recording area is accidentally focused on one recording area of the second recording layer, Control information cannot be read in the recording area. That is, since the control information necessary for recording the record information is not recorded, the information recording / reproducing apparatus determines that the subsequent recording operation cannot be continued, for example, or that the information recording medium is defective. For this reason, it is possible to prevent inconvenience such as recording information on the second recording layer by mistake by focusing on the second recording layer. In addition, the information recording medium cannot be properly recognized, and it is possible to prevent inconvenience such as the operation of the information recording / reproducing apparatus being stopped or the runaway of the operation. In this case, for example, if the information recording medium is ejected and reloaded, it is possible to focus on an appropriate recording layer and perform an appropriate recording operation.

  In particular, an information recording / reproducing apparatus that does not support an information recording medium having two or more recording layers cannot determine that the information recording medium has two recording layers. The recorded layer may be recognized as an appropriate recording layer. In this case, recording information may be recorded on a recording layer different from the recording layer that should be recorded. However, according to the information recording medium according to the present embodiment, even if the recording layer is erroneously focused on (for example, the second recording layer), control information is not recorded, so the subsequent recording operation is continued. For example, the information recording medium can be ejected. Therefore, even an information recording / reproducing apparatus that does not support an information recording medium having two or more recording layers can realize an appropriate recording operation. In other words, recording information can be appropriately recorded on a desired recording layer by using such an information recording / reproducing apparatus on an information recording medium having two or more recording layers expected to be spread in the future. Thus, in the present embodiment, compatibility between an existing information recording / reproducing apparatus currently distributed in the market and an information recording medium having two or more recording layers expected to be widely used in the future can be achieved. This information recording medium has a great advantage.

  Of course, even in an information recording / reproducing apparatus corresponding to an information recording medium having two or more recording layers, information recorded on an unintended recording layer is accidentally focused on the second recording layer. Has the great advantage of preventing the inconvenience of recording.

  As described above, according to the embodiment of the information recording medium of the present invention, it is appropriate that when the laser beam is originally focused on the first recording layer, the second recording layer is erroneously focused on. Can be recognized. Therefore, for example, by taking measures such as reloading of the information recording medium at that time, it is possible to appropriately record the recording information on the information recording medium having a plurality of recording layers.

  In the above-described embodiment, the information recording medium in which the control information is recorded in the recording area other than the one recording area of the second recording layer facing the specific recording area where the laser beam in the first recording layer is focused in. The explanation was advanced. However, the scope of the present invention also applies to an information recording medium in which control information is recorded in a recording area other than one recording area of the first recording layer facing a specific recording area where the laser beam in the second recording layer is focused in. Needless to say, it is included in In this case, when the laser beam is originally intended to be focused on the second recording layer, it can be appropriately recognized that the first recording layer is mistakenly focused, and as a result, the above-described various benefits can be enjoyed. .

  According to one aspect of the embodiment of the information recording medium of the present invention, at least one of the specific recording area and the one recording area includes management information for managing the recording information recorded on the information recording medium. It is at least a part of the management information area for recording.

  According to this aspect, control information is not recorded in one recording area corresponding to a part of the management information area. Accordingly, it is possible to prevent the inconvenience of performing the recording operation by erroneously focusing in the lead-in area or lead-out area where the laser beam can be irradiated.

  In another aspect of the embodiment of the information recording medium of the present invention, the one recording area is larger than the specific recording area.

  According to this aspect, it is possible to more effectively recognize the inconvenience that the laser beam is erroneously focused on the second recording layer. In particular, in a bonded information recording medium, the centers of the first recording layer and the second recording layer may be shifted (that is, eccentricity occurs). However, according to this aspect, since a relatively large recording area is provided in anticipation of such a shift, it is possible to compensate for the shift even if an eccentricity occurs. .

  In another aspect of the embodiment of the information recording medium of the present invention, the control information includes address information indicating a position where the recording information is recorded on the information recording medium.

  According to this aspect, address information as control information is not recorded in one recording area. For this reason, even if the laser beam is focused on the second recording layer without originally intending, the address information cannot be read and the above-described various benefits can be enjoyed.

  In another aspect of the embodiment of the information recording medium of the present invention, a groove for recording the recording information and a land adjacent to the groove are formed on the other of the first and second recording layers. The groove in the recording area excluding at least the one recording area has a wobble that swings at a predetermined period and indicates the control information.

  According to this aspect, no wobble indicating control information is formed in one recording area. For this reason, even if laser light is accidentally irradiated onto one recording area of the second recording layer, the wobble cannot be detected, and as a result, the control information indicated by the wobble cannot be read. Therefore, it is possible to enjoy the various benefits described above.

  In this aspect, a pre-pit indicating the control information may be formed on the land in the recording area excluding at least the one recording area.

  With this configuration, no pre-pit indicating control information is formed in one recording area. In particular, it is more preferable that at least the prepits indicating the address information are not formed in one recording area. For this reason, even if laser light is accidentally irradiated to one recording area of the second recording layer, the prepit cannot be detected, and as a result, the control information indicated by the prepit cannot be read. Therefore, it is possible to enjoy the various benefits described above.

  In the aspect in which the pre-pit is formed, the pre-pit indicating erroneous control information may be formed in at least the land in the one recording area.

  According to this aspect, prepits indicating erroneous control information are formed in one recording area. Here, “wrong control information” in the present invention is intended to indicate control information in which recording information cannot be properly recorded. For example, if the control information indicates address information, address information indicating an address different from the original address as erroneous control information is recorded intentionally (or in advance when the information recording medium is manufactured). That is the purpose. For this reason, even if laser light is accidentally irradiated to one recording area of the second recording layer, the control information cannot be read appropriately. Therefore, it is possible to enjoy the various benefits described above.

  These effects and other advantages of the present invention will become apparent from the embodiments described below.

  As described above, the embodiment according to the information recording medium of the present invention includes the first recording layer and the second recording layer, and the control information is recorded in the recording area other than the one recording area in the second recording layer. Not. Therefore, it is possible to appropriately record the recording information on the information recording medium having a plurality of recording layers.

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

(Example of information recording medium)
(1) First Example First, the first example of the information recording medium of the present invention will be described with reference to FIGS.

  First, an optical disc as an embodiment according to the information recording medium of the present invention will be described with reference to FIG. FIG. 1 shows a schematic plan view of the structure of an optical disc having a plurality of areas on the upper side, and shows the area structure in the radial direction in association with the lower side in a conceptual diagram.

  First, with reference to FIG. 1, the basic structure of an optical disc relating to an information recording medium which is a target of the first embodiment of the information recording apparatus of the present invention will be described. FIG. 1A is a schematic plan view showing a basic structure of an optical disc having a plurality of recording areas according to an information recording medium which is a target of the first embodiment of the information recording apparatus of the present invention. FIG. 1B is a schematic cross-sectional view of the optical disc and a schematic conceptual diagram of the recording area structure in the radial direction associated therewith.

  As shown in FIGS. 1 (a) and 1 (b), an optical disc 100 is a lead according to the present embodiment centered on a center hole 1 on a recording surface on a disc main body having a diameter of about 12 cm as in the case of a DVD. An in area 101, a data area 102, a lead out area 103, or a middle area 104 are provided. For example, a recording layer or the like is laminated on the transparent substrate 200. In each recording area of the recording layer, for example, tracks 10 such as a groove track and a land track are alternately provided in a spiral shape or a concentric shape around the center hole 1. On the track 10, data is divided and recorded in units of ECC blocks 11. The ECC block 11 is a data management unit based on a preformat address in which recorded information can be error-corrected.

  The present invention is not particularly limited to an optical disc having such three areas. For example, even if the lead-in area 101, the lead-out area 103, or the middle area 104 does not exist, a data structure described below can be constructed. The lead-in area 101, the lead-out area 103, or the middle area 104 may be further subdivided.

  In particular, as shown in FIG. 1B, the optical disc 100 according to this embodiment includes, for example, an L0 layer and an L1 layer that constitute an example of the first and second recording layers according to the present invention on a transparent substrate 200. Has a laminated structure. At the time of recording / reproduction of such a two-layer type optical disc 100, depending on which recording layer the focusing position of the laser beam LB irradiated from the upper side to the lower side in FIG. Recording or reproduction in the L0 layer is performed, or recording or reproduction in the L1 layer is performed. Further, the optical disc 100 according to the present embodiment is not limited to the two-layer single side, that is, the dual layer, but may be the two-layer double side, that is, the dual layer double side. Furthermore, as described above, the optical disk is not limited to an optical disk having two recording layers, and may be a multilayer optical disk having three or more layers.

  Incidentally, the recording / reproduction procedure by the opposite track path method and the parallel track path method in the two-layer type optical disk and the data structure in each layer will be described later.

  As shown in FIG. 2, the optical disc 100 according to the present embodiment is configured as a two-layer type optical disc in which a plurality of data areas 102 and the like are formed in a laminated structure, for example. FIG. 2 is a partially enlarged perspective view of the recording surface of the optical disc of the first embodiment.

  In FIG. 2, in the first embodiment, an optical disk 100 is a first recording layer of an irreversible change recording type by heating or the like constituting an information recording surface on a disk-shaped transparent substrate 106 (lower side in FIG. 2). 107 (that is, the L0 layer) is laminated, and a transflective film 108 is further laminated thereon (on the lower side in FIG. 2). Groove tracks GT and land tracks LT are alternately formed on the information recording surface formed by the surface of the first recording layer 107. Incidentally, at the time of recording and reproduction of the optical disc 100, for example, as shown in FIG. 2, the laser beam LB is irradiated onto the groove track GT through the transparent substrate. For example, at the time of recording, irreversible change recording by heating the first recording layer 107 or the like is performed according to the recording data by irradiating the laser beam LB with the recording laser power. On the other hand, at the time of reproduction, the recording data written in the first recording layer 107 is read by irradiating the laser beam LB with a reproduction laser power weaker than the recording laser power.

  The groove track GT is oscillated with a constant amplitude and spatial frequency. That is, the groove track GT is wobbled, and the period of the wobble 109 is set to a predetermined value. On the land track LT, address pits called land prepits LP indicating preformat address information are formed. Information necessary for data recording such as disk rotation control during recording, generation of a recording clock, and recording address can be obtained by these two addressing (ie, wobble 109 and land prepit LP). The preformat address information may be recorded in advance by modulating the wobble 109 of the groove track GT by a predetermined modulation method such as frequency modulation or phase modulation.

  Next, the optical disk according to the first embodiment will be described in more detail with reference to FIG. FIG. 3 is a data structure diagram conceptually showing the data structure of the opposite track path optical disc.

  As shown in FIG. 3A, in the optical disc 100 according to the first embodiment, the L0 layer is configured by the lead-in area 101, the data area 102, and the middle area 104, which are specific examples of the “management information area” in the present invention. The L1 layer is configured by the lead-out area 113, the data area 112, and the middle area 114. 3 includes a clock signal for controlling data recording (that is, a signal for synchronization), preformat address information as a specific example of “address information” in the present invention, and the like. Control information is recorded. The middle area 104 or 114 serves as an interference area when the data recording target is switched from the L0 layer to the L1 layer.

  Particularly in the first embodiment, at least one type of control information is not recorded in a part of the area 113a of the lead-out area 113 of the L1 layer (that is, a specific example of “one recording area” in the present invention). . That is, all control information is recorded only in the area excluding the area 113a. The area 113a may not have any control information. Such control information is recorded, for example, as wobble 109 or land prepit LP.

  This area 113a is an area of the L1 layer corresponding to the area of the L0 layer to which the laser beam LB is first irradiated by an information recording / reproducing apparatus described later when data is recorded on the optical disc 100. That is, the area 113a corresponds to the area of the L1 layer that is at the same or substantially the same position as the area when the laser beam LB is irradiated to the area of the L0 layer. For example, in the case of an opposite track path type optical disc, the area of the L1 layer having an address value that is complementary to the address value indicated by the preformat address information of the L0 layer area irradiated with the laser light corresponds to the area 113a. To do. Further, in the case of a parallel track path type optical disc, the area of the L1 layer having the same address value as the address value indicated by the preformat address information of the L0 layer area irradiated with the laser light corresponds to the area 113a.

  More specifically, as shown in FIG. 3B, the area 113a has an L1 layer corresponding to the control data zone of the L0 layer (that is, a specific example of “specific recording area” in the present invention). It is an area. That is, when the optical disc 100 is loaded in the information recording / reproducing apparatus, the information recording / reproducing apparatus first irradiates the control data zone with laser light to perform subsequent data recording operations.

  Of course, when the area irradiated with the laser beam first is an area other than the control data zone, it goes without saying that the area 113a may not be an area corresponding to the control data zone.

  Here, a comparative example of the optical disk according to the first embodiment will be described with reference to FIGS. 4 is a data structure diagram conceptually showing one data structure of the optical disc according to the comparative example, and FIG. 5 is a data structure diagram conceptually showing another data structure of the optical disc according to the comparative example. It is.

  As shown in FIG. 4A, in the opposite track path type optical disc 100a, control information is recorded in both areas of the L0 layer and the L1 layer. Therefore, when the laser beam LB is irradiated to the control zone of the L0 layer, the laser beam LB may be erroneously focused in the corresponding area of the L1 layer. At this time, since the control information can be read also in the L1 layer, the information recording / reproducing apparatus recognizes the address and tries to continue the recording operation in the L1 layer.

  The operation in that case will be specifically described below. As shown in FIG. 4B, the address value in the L0 layer increases toward the outer peripheral side (that is, the middle area 104 side), while the address value in the L1 layer increases on the outer peripheral side (that is, the middle area). 114 side). When the laser beam LB is mistakenly focused on the L1 layer, the information recording / reproducing apparatus will try to read control information that will be located on the inner circumference side (that is, will have a smaller address value). To do. This is because the address value at the focus-in position in the L1 layer is larger than the address value of the control information that should be read when the focus-in is originally performed in the L0 layer. However, in the L1 layer, since the address value increases toward the inner circumference side, the information recording / reproducing apparatus further moves the optical pickup to the inner circumference side in order to search for an appropriate address value. For this reason, this operation is continued until the movement of the optical pickup is finally limited by the stopper located on the innermost peripheral side. Such a situation is not preferable from the viewpoint of an appropriate recording operation or a quick recording operation.

  Further, as shown in FIG. 5 (a), the parallel track path type optical disc 100b can be said to be the same as the opposite track path type optical disc 100a shown in FIG. In the parallel track path type optical disc 100b, as shown in FIG. 5B, the preformat address information increases in the L0 layer and the L1 layer as they move to the outer peripheral side. Therefore, since control information that should be read when focusing on the L0 layer is not recorded at the focus-in position in the L1 layer, the information recording / reproducing apparatus is positioned more on the inner periphery side (or outer periphery side). Attempts to read control information that would be However, naturally, the control information that should be read when focusing on the L0 layer should not be recorded in the L1 layer, and as a result, the L1 layer is eventually recorded on the innermost side (or the innermost side). This operation is continued until the movement of the optical pickup is restricted by the stopper located on the side.

  As described above, when control information is recorded on the entire recording surface as in the optical disc according to the comparative example, control information such as preformat address information (control information that should be read when focus-in is originally performed) also in the L1 layer. Can be read appropriately. Therefore, even if the laser beam is actually focused in the L1 layer, the information recording / reproducing apparatus recognizes that the laser beam is focused in the L0 layer. For this reason, as described above, there is a technical problem that data cannot be properly recorded as originally intended, or an appropriate recording operation cannot be continued.

  However, in the case of the optical disc according to the first embodiment, not all control information is recorded in the area 113a of the L1 layer. Therefore, even if the laser beam LB is erroneously focused on the L1 layer, the information recording / reproducing apparatus cannot read the control information, and as a result, the optical disc can be determined to be defective or inappropriate. . In this case, if the optical disk is reloaded automatically by the information recording / reproducing apparatus or by the user's operation, the L0 layer can be appropriately focused on, and the subsequent appropriate recording operation can be continued. At this time, if there is inconvenience such as focusing on the L1 layer again, the optical disk may be reloaded again, or it is determined that the optical disk is a completely unrecordable disk. The user may be instructed to load another optical disk.

  In any case, an appropriate recording operation can be continued by configuring so that the control information is not recorded in the area 113a of the L1 layer as in the optical disc according to the first embodiment. Furthermore, as described above, it is possible to avoid an operation of unnecessarily searching for control information in the L1 layer and to realize a quick recording operation. In particular, even in an existing information recording / reproducing apparatus that does not support an optical disc having two or more recording layers, the optical disc is a defective disc or an appropriate optical disc if the area 113a is mistakenly focused. Judgment can be made. That is, even in an information recording / reproducing apparatus that cannot originally recognize the first recording layer and the second recording layer separately, it is erroneously focused on the second recording layer (or an erroneous focus-in is detected). It can be determined that a disc that has been made or is not suitable is loaded). Therefore, for example, it is possible to appropriately take measures such as reloading, and it is possible to continue an appropriate recording operation.

  Of course, a parallel track path type optical disc (not shown) may employ a structure in which control information is not recorded in the area of the L1 layer corresponding to the area where the laser beam is first irradiated in the L0 layer. Even if comprised in this way, it will become possible to receive the same profit as the optical disk which concerns on 1st Example mentioned above.

  Next, with reference to FIG. 6 to FIG. 9, the recording mode of the control information in the optical disc according to the first embodiment will be described in more detail. 6, 7, and 9 are plan views conceptually showing a control information recording mode, and FIG. 8 is obtained by reading the control information recorded on the optical disc according to the first embodiment. 6 is a graph conceptually showing a groove detection signal obtained.

  As shown in FIG. 6, the area 113a may be configured not to form the land prepits LP. That is, the preformat address information may not be recorded by not forming the land prepit LP. As a result, the information recording / reproducing apparatus cannot read the preformat address information in the area 113a, and can determine that the optical disc is defective or inappropriate.

  Alternatively, as shown in FIG. 7, land prepits LP are formed, but the land prepits LP may be configured not to include preformat address information. That is, the land prepit LP including only a clock signal (or timing signal) for synchronizing data recording and reproduction may be formed on the land track LT.

  Here, the land prepits LP will be specifically described. Three land prepits LP are formed approximately every 8 wobbles. At least one of the three land prepits LP indicates a clock signal for synchronization, and the other land prepits LP indicate preformat address information and information for controlling recording of other data. . In the first embodiment, the land pre-pits LP are formed so as to indicate only the at least one synchronization clock signal.

  Thus, when the synchronous land pre-pit LP is formed, the information recording / reproducing apparatus detects a groove detection signal as shown in FIG. That is, only the synchronization clock signal is superimposed on the groove detection signal that vibrates in accordance with a predetermined cycle of the wobble 109, and signals based on other preformat address information and other information for controlling data recording are not superimposed.

  Further, land pre-pits LP indicating preformat address information indicating erroneous information and other information for controlling data recording may be formed. That is, land pre-pits that do not appropriately indicate the original address value or the like may be formed. Even with this configuration, the information recording / reproducing apparatus cannot read preformat address information or other information for controlling data recording, and as a result, can determine that the optical disc is defective or inappropriate. it can.

  As shown in FIG. 9, neither the wobble 109 nor the land prepit LP need be formed. That is, both the groove track GT and the land track LT may be formed linearly.

(2) Second Example Next, with reference to FIGS. 10 and 11, a second example of the information recording medium of the present invention will be described. FIG. 10 and FIG. 11 are graphs conceptually showing the groove detection signal detected from the optical disc in the second example.

  The optical disk according to the second embodiment also employs the same data structure as that of the first embodiment. Particularly in the second embodiment, the predetermined modulation is applied to the wobble described above, so that a clock signal for synchronization and preformat address information at the time of data recording can be detected. For example, a groove detection signal as shown in FIG. 10 can be detected by performing FM (Frequency Modulation) modulation on the wobble as in CD-R / RW. Alternatively, a groove detection signal as shown in FIG. 11 can be detected by performing BPM (Bi-Phase Modulation) modulation on the wobble, for example, DVD + R / RW.

  In this embodiment, such modulation is not performed in the area 113a. That is, even if it is attempted to read the control information by irradiating the laser beam in the area 113a, the control information is read because the modulation is not performed (or appropriate modulation indicating the control information is not performed). I can't. That is, not the groove detection signal modulated as shown in FIGS. 10 and 11, but only the groove detection signal based on the wobble 109 swing is detected. As a result, even in the optical disc according to the second embodiment, it is possible to receive the same benefits as the optical disc according to the first embodiment.

(3) Third Example Next, with reference to FIG. 12, a third example of the information recording medium of the present invention will be described. FIG. 12 is a data structure diagram conceptually showing the data structure of the optical disc in the third example.

  As shown in FIG. 12 (a), the optical disc 100c according to the third embodiment is similar to the optical disc according to the first and second embodiments in the L1 corresponding to the region where the laser beam is first irradiated in the L0 layer. All control information is not recorded in the layer area.

  Particularly in the third embodiment, the size of the area 113a is larger than the size of the area irradiated with the laser beam LB in the L0 layer. Specifically, as shown in FIG. 13B, both ends of the area 113a are larger by about 70 μm than the size of the area irradiated with the laser beam LB in the L0 layer. The size of “70 μm” is an allowable eccentricity according to the standard in a DVD having a plurality of recording layers.

  By determining the size of the area 113a in which control information is not recorded in consideration of eccentricity in this way, it is possible to more suitably determine the inconvenience that the laser beam LB is erroneously focused on the L1 layer. That is, because the eccentricity has occurred, the control data zone of the L0 layer and the area 113a corresponding thereto may not correspond appropriately to the laser light. At this time, if the size of the area 113a is increased in advance as in the third embodiment, an optical disc in which no control information is recorded in the area corresponding to the control data zone can be realized even if eccentricity occurs. can do.

(Information recording / reproducing device)
Next, the configuration and operation of an embodiment of an information recording apparatus that records and reproduces data using the information recording medium according to the present invention will be described with reference to FIG.

  First, the configuration of an information recording / reproducing apparatus 300 according to an embodiment of the present invention will be described with reference to FIG. FIG. 13 is a block diagram of the information recording / reproducing apparatus 300 according to the embodiment of the present invention. The information recording / reproducing apparatus 300 has a function of recording record data on the optical disc 100 and a function of reproducing the record data recorded on the optical disc 100.

  The internal configuration of the information recording / reproducing apparatus 300 will be described with reference to FIG. The information recording / reproducing apparatus 300 is an apparatus that records information on the optical disc 100 and reads information recorded on the optical disc 100 under the control of the CPU 354.

  The information recording / reproducing apparatus 300 includes an optical disc 100, a spindle motor 351, an optical pickup 352, a signal recording / reproducing means 353, a CPU (drive control means) 354, a memory 355, a data input / output control means 306, an operation button 310, a display panel 311, And a bus 357.

  The spindle motor 351 rotates and stops the optical disc 100, and operates when accessing the optical disc. More specifically, the spindle motor 351 is configured to rotate and stop the optical disc 100 at a predetermined speed while receiving spindle servo from a not-shown servo unit or the like.

  The optical pickup 352 performs recording / reproduction with respect to the optical disc 100, and includes a laser device and a lens. More specifically, the optical pickup 352 irradiates the optical disc 100 with a light beam such as a laser beam at a first power as reading light during reproduction, and modulates with a second power as writing light at the time of recording. Irradiate.

  The signal recording / reproducing unit 353 controls the spindle motor 351 and the optical pickup 352 to perform recording / reproduction with respect to the optical disc 100.

  The memory 355 is used in general data processing in the disk drive 300, such as a buffer area for recording / reproducing data and an area used as an intermediate buffer for conversion to data usable by the signal recording / reproducing means 353. The memory 355 includes a ROM area in which a program for performing operations as these recorder devices is stored, a buffer used for compressing / decompressing video data, and a RAM area in which variables necessary for the program operation are stored. .

  A CPU (drive control means) 354 is connected to the signal recording / reproducing means 353 and the memory 355 via the bus 357, and controls the entire information recording / reproducing apparatus 300 by giving instructions to each control means. Normally, software for operating the CPU 354 is stored in the memory 355.

  The data input / output control unit 306 controls data input / output from the outside to the information recording / reproducing apparatus 300, and stores and retrieves data from / in the data buffer on the memory 355. When the data input / output is a video signal, the data received from the outside is compressed (encoded) into the MPEG format at the time of data input, and then output to the memory 355. At the time of data output, the MPEG format received from the memory 355 is output. Data is decompressed (decoded) and then output to the outside.

  The operation control means 307 receives and displays an operation instruction for the information recording / reproducing apparatus 300. The operation control means 307 transmits an instruction by the operation button 310 such as recording or reproduction to the CPU 354, and indicates the operation state of the information recording / reproducing apparatus 300 such as recording or reproduction. Output to a display panel 311 such as a fluorescent tube.

  As described above, the household device, which is an example of the information recording / reproducing apparatus 300, is a recorder device that records and reproduces video. This recorder device is a device that records a video signal from a broadcast receiving tuner or an external connection terminal on a disk and outputs a video signal reproduced from the disk to an external display device such as a television. The operation as a recorder device is performed by causing the CPU 354 to execute the program stored in the memory 355.

  Particularly in this embodiment, since the optical disc 100 has the area 113a in which control information is not recorded as described above, even if the laser beam LB is mistakenly focused in the L1 layer, it is considered to be an error. It becomes possible to judge. Accordingly, it is possible to continue an appropriate recording operation as described above.

  In the above-described embodiments, the optical disc 100 is described as an example of the information recording medium, and the recorder and player related to the optical disc 100 as an example of the information recording / reproducing apparatus. However, the present invention is limited to the optical disc and the recorder and player. However, the present invention can also be applied to various information recording media compatible with other high-density recording or high transfer rate, and its recorder and player.

  The present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification, and information recording accompanying such changes is possible. The medium is also included in the technical scope of the present invention.

The information recording medium according to the present invention is suitable for an information recording medium having a plurality of recording layers, such as a multilayer type, double layer, or multiple layer type optical disc in which a plurality of recording layers are laminated on the same substrate. Can be used for an information recording medium or the like that makes it possible to record and reproduce recorded data.

Claims (4)

A first recording layer for recording recording information;
An information recording medium comprising: a second recording layer that records the recording information by irradiating the laser light through the first recording layer,
In the recording area except for one recording area in the other of the first and second recording layers facing the specific recording area for focusing the laser beam in one of the first and second recording layers. Control information for controlling the recording of information is recorded ,
On the other of the first and second recording layers, a groove for recording the recording information and a land adjacent to the groove are formed,
The groove in the recording area excluding at least the one recording area has a wobble that oscillates at a predetermined period and indicates the control information;
A pre-pit indicating the control information is formed on the land in the recording area excluding at least the one recording area,
The information recording medium, wherein the pre-pits indicating erroneous control information are formed on at least the land in the one recording area . At least one of the specific recording area and the one recording area is at least a part of a management information area for recording management information for managing the recording information recorded on the information recording medium. The information recording medium according to claim 1 . The information recording medium according to claim 1 , wherein the one recording area is larger than the specific recording area. The information recording medium according to claim 1 , wherein the control information includes address information indicating a position where the recording information is recorded on the information recording medium.

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