JP2007048404A - Information recording medium, information processing apparatus and method, and processing controlling computer program for executing recording or reproduction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information recording medium with a plurality of recording layers that can more simply record/reproduce information with high accuracy. <P>SOLUTION: The information recording medium (100) includes at least: (i) a first recording layer (BD) capable of recording/reproducing recording information based on a first track pitch corresponding to a first wavelength of a first laser beam; and (ii) a second recording layer (DVD) capable of recording/reproducing the recording information based on a second track pitch corresponding to a second wavelength of a second laser beam, wherein a guide track (GT) from which clock information or address information for recording/reproducing the recording information can be detected is formed to either of the recording layers. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention performs recording or reproduction on a multilayer information recording medium such as a dual-layer DVD and CD (Compact Disc), a DVD recorder for recording information on the information recording medium, and reproducing information, and the like. The present invention relates to an information processing apparatus and method, and a technical field of a computer program for processing control that performs recording or reproduction.

  For example, in information recording media such as CD-ROM (Compact Disc-Read Only Memory), CD-R (Compact Disc-Recordable), DVD-ROM, DVD-R, DVD-RW, and DVD + R, Patent Document 1, 2 and the like, an information recording medium such as a multilayer type or dual layer type optical disc in which a plurality of recording layers are laminated or bonded on the same substrate has been developed. In an information recording apparatus such as a DVD recorder that performs recording on such a dual layer type, that is, a two-layer type optical disc, the foremost side when viewed from the laser beam irradiation side (ie, the side closer to the optical pickup) The recording laser beam is focused on the recording layer (referred to as “L0 layer” in this application as appropriate) located in the, so that the information is irreversibly changed by heating or the like on the L0 layer, or a rewritable method. Is recorded. On the other hand, with respect to the recording layer (referred to as “L1 layer” in this application as appropriate) located on the far side of the L0 layer (that is, the side far from the optical pickup) as viewed from the laser light irradiation side through the L0 layer or the like. By condensing the laser beam, information is recorded on the L1 layer by an irreversible change recording method such as heating or a rewritable method. In general, in a recording layer included in a recording type information recording medium, (i) in order to guide a recording laser beam based on tracking control (tracking servo), for example, meandering in the radial direction A wobbling guide groove, a so-called groove track (guide track) is formed. At the same time, (ii) Land pre-pits (LPP: Land Pre-Pit) are formed in the land track, for example, in order to hold the address information for specifying the recording position based on the tracking control, or the address information is included in the wobble signal. May be superimposed. Further, a guide track is formed, and for example, a recording layer for performing tracking control, that is, an L0 layer dedicated to tracking control, and also from the red LD are irradiated by laser light emitted from a red LD (red laser diode). An information recording medium including an L1 layer that performs recording or reproduction by laser light has also been proposed.

  Further, as disclosed in Patent Document 3, for example, at least two recording layers that can be recorded by two or more kinds of laser beams having different wavelengths such as blue-ray, red laser beam, and infrared beam, respectively. In an information recording medium such as a so-called hybrid type optical disc provided, a method of inserting an intermediate layer (hereinafter referred to as a “wavelength selection layer” as appropriate) has been proposed. This intermediate layer has a relatively high light reflectivity for a relatively short laser beam of one wavelength, and a relatively low light reflectivity for a relatively long laser beam of another wavelength. Retain sex. Accordingly, since the recording medium can be reproduced by either a reproducing apparatus that emits laser light of one wavelength or a reproducing apparatus that emits laser light of another wavelength, it is possible to maintain reproduction compatibility. Specifically, as disclosed in Patent Document 4, a hybrid type optical disc including a read-only recording layer such as a DVD-ROM and a recording type recording layer such as a DVD-R is also available. It has been devised. In addition, as disclosed in Non-Patent Document 1, a hybrid optical disc including a CD-ROM and a BD-ROM has been devised.

JP 2000-31346 A Japanese Patent Laid-Open No. 2001-23237 JP-A-9-237438 JP 2001-176120 A Nikkei Electronics, [online], October 18, 2004, [March 4, 2005 search], Internet <URL: http://nikkeibp.jp/wcs/leaf/CID/onair/jp/jp_print/337888>

  However, when manufacturing such a two-layer type information recording medium, the L0 layer and the L1 layer are formed by separate stampers, and the respective recording layers are bonded or laminated. Therefore, for example, in a manufacturing process including a vapor deposition process and a sputtering process, adjustment of various physical parameters becomes complicated, and there is a technical problem that the manufacturing cost may increase. Yes.

  Alternatively, in the L0 layer and the L1 layer, eccentricity may occur due to a bonding error. Further, since the L0 layer and the L1 layer are respectively created by different stampers, a deviation occurs in the track pitch in each recording layer, or there is a deviation in the absolute radial position with respect to the reference address in each recording layer. In other words, a so-called dimensional error may occur. Due to these causes, a deviation occurs in the radial position of the recording area of the L1 layer corresponding to the address information such as the preformat address in the recording area of the L0 layer. Accordingly, it is difficult to realize a high-precision recording operation that satisfies, for example, the recording requirement (Recording Order), that is, the requirement that the recording laser beam that has passed through the L0 layer in the recorded state must be irradiated. It has the technical problem of becoming.

  The present invention has been made in view of, for example, the conventional problems described above. For example, even an information recording medium having a plurality of recording layers can record or reproduce information more easily and with high accuracy. It is an object of the present invention to provide an information recording medium, an information processing apparatus and method for performing recording or reproduction, and a computer program that causes a computer to function as an information processing apparatus for performing such recording or reproduction.

  In order to solve the above problem, an information recording medium according to claim 1 records or reproduces recording information including first information based on a first track pitch corresponding to a first wavelength of the first laser beam. The recording information including the second information can be recorded or reproduced based on the first recording layer (BD) that can be performed and the second track pitch corresponding to the second wavelength of the second laser light. A second recording layer (DVD), and clock information for recording or reproducing the recording information in one of the first recording layer and the second recording layer (guide layer), Alternatively, a guide track capable of detecting address information is formed.

  To solve the above problem, the information processing apparatus according to claim 15 records or reproduces recording information including first information based on a first track pitch corresponding to a first wavelength of the first laser beam. The second recording capable of recording or reproducing the recording information including the second information based on the first recording layer that can be performed and the second track pitch corresponding to the second wavelength of the second laser light And at least one of the first recording layer and the second recording layer (guide layer) can detect clock information or address information for recording or reproducing the recording information. Recording including the second information on at least the second recording layer (L1 layer) by laser light transmitted through the first recording layer (L0 layer) on the information recording medium on which the guide track is formed. Information recording Is an information processing apparatus for performing reproduction, and tracking control means for performing tracking control in at least one recording layer (guide layer) based on the guide track, (i) the tracking control, and (ii) the above Recording information including the second information with respect to the other recording layer of the first recording layer and the second recording layer based on the ratio of the lengths of the first track pitch and the second track pitch And processing means for performing recording or reproduction.

  In order to solve the above-described problem, an information processing method according to claim 16 records or reproduces recording information including first information based on a first track pitch corresponding to a first wavelength of the first laser beam. A second recording medium that can record or reproduce the recording information including the second information based on a first recording layer that can be recorded and a second track pitch corresponding to the second wavelength of the second laser beam. At least a recording layer, and can detect clock information or address information for recording or reproducing the recording information in one of the first recording layer and the second recording layer (guide layer) An information recording medium on which a small guide track is formed includes at least the second information with respect to at least the second recording layer (L1 layer) by laser light transmitted through the first recording layer (L0 layer). Recorded information An information processing method for recording or reproducing, wherein a tracking control step of performing tracking control in at least one recording layer (guide layer) based on the guide track, (i) the tracking control, and (ii) Recording including the second information with respect to the other recording layer of the first recording layer and the second recording layer based on the ratio of the lengths of the first track pitch and the second track pitch And a processing step for recording or reproducing information.

  In order to solve the above problem, a computer program according to claim 17 is a computer program for processing control for controlling a computer provided in the information processing apparatus according to claim 15, wherein the computer is It functions as at least a part of the tracking control means and the processing means.

  The operation and other advantages of the present invention will become apparent from the embodiments described below.

  Hereinafter, an information recording medium, an information processing apparatus and method, and a computer program according to an embodiment of the present invention as the best mode for carrying out the invention will be described in order.

(Embodiment related to information recording medium)
Hereinafter, an information recording medium according to an embodiment of the present invention will be described.

  Embodiments according to the information recording medium of the present invention are capable of recording or reproducing recording information including first information based on a first track pitch corresponding to the first wavelength of the first laser beam. A recording layer (BD) and a second recording layer (DVD) capable of recording or reproducing recording information including second information based on a second track pitch corresponding to the second wavelength of the second laser light And a guide capable of detecting clock information or address information for recording or reproducing the recording information in one of the first recording layer and the second recording layer (guide layer). A track is formed.

  According to the embodiment of the information recording medium of the present invention, for example, a first recording layer such as a Blu-ray Disc (BD) or HD-DVD (High Definition-DVD) and a second recording such as a DVD. And at least a layer. First, the first recording layer uses, for example, a first laser beam having a first wavelength, which is a wavelength in a blue LD (blue laser diode), based on a first track pitch corresponding to the first wavelength. For example, it has a signal surface capable of recording or reproducing recorded information. On the other hand, the second recording layer uses, for example, a second laser beam having a second wavelength, which is a wavelength in a red LD (red laser diode), to obtain second information based on the second track pitch corresponding to the second wavelength. For example, it has a signal surface capable of recording or reproducing the recorded information.

  In particular, according to the present embodiment, one of the first recording layer and the second recording layer is formed with a guide track capable of detecting clock information or address information for recording or reproducing the recording information. Has been. Accordingly, there is little or no need to form guide tracks such as groove tracks on the plurality of recording layers. As a result, it is possible to simplify the structure of an information recording medium having a plurality of recording layers. For example, in the manufacturing process including a vapor deposition process and a sputtering process, adjustment of various physical parameters is simplified or omitted. Thus, the manufacturing cost can be reduced.

  In addition, for example, with respect to a multilayer type information recording medium in which a plurality of recording layers are formed by separate stampers and a plurality of recording layers are bonded or laminated, (i) due to a bonding error (Iii) deviation of track pitch in a plurality of recording layers, and (iii) deviation in absolute radial position with respect to a reference address in a plurality of recording layers, so-called dimensional error is almost or completely affected. There is nothing. As a result, recording or reproduction of information in a plurality of recording layers is affected by physical errors such as eccentricity and track pitch deviation with reference to a guide track formed in one (one) recording layer. And can be performed with high accuracy.

  In addition, tracking control is performed, for example, on the guide track formed in the first recording layer by the first laser beam having the first wavelength, which is the wavelength in the blue LD, for example, and the first information is recorded or reproduced. Let's do it. At the same time or before and after, the second information is recorded or reproduced by the second laser beam having the second wavelength, which is the wavelength in the red LD, for example. As a result, it is possible to record or reproduce information by a plurality of types of laser beams substantially (substantially) simultaneously or in succession.

  In one aspect of the embodiment of the information recording medium of the present invention, the other recording layer of the first recording layer and the second recording layer includes (i) the guide track, and (ii) the first recording layer. The recording information can be recorded or reproduced based on the ratio of the length between the track pitch and the second track pitch.

  According to this aspect, (i) a guide track formed in one recording layer, and (ii) a length ratio between the first track pitch and the second track pitch, at least in the other recording layer Information recording or reproduction can be performed with higher accuracy without being affected by physical errors such as eccentricity and track pitch deviation.

  In another aspect of the embodiment of the information recording medium of the present invention, the recording density in the recording track of the one recording layer (guide layer) and the other recording of the first recording layer and the second recording layer are recorded. The ratio of the recording density of the layer to the recording track can be close to the reciprocal of the ratio of the lengths of the first track pitch and the second track pitch, as compared to 1: 1.

  According to this aspect, the recording density in the recording track of one recording layer and the recording in the recording track of the other recording layer that are close to the reciprocal of the ratio of the lengths of the first track pitch and the second track pitch. Based on the ratio to the density, it is possible to record or reproduce information in at least the other recording layer with higher accuracy without being affected by physical errors such as eccentricity and track pitch deviation. .

  In another aspect of the embodiment of the information recording medium of the present invention, the recording density in the recording track of the one recording layer (guide layer) and the other recording of the first recording layer and the second recording layer are recorded. The ratio of the recording density in the recording track of the layer is an integer multiple of the reciprocal of the ratio of the lengths of the first track pitch and the second track pitch (a natural number multiple of 2 or more). ).

  According to this aspect, the recording density in the recording track of one recording layer brought close to an integral multiple (a natural number multiple of 2 or more) of the reciprocal of the ratio of the lengths of the first track pitch and the second track pitch. And recording / reproducing information in at least the other recording layer based on the ratio of the recording density of the other recording layer to the recording track without being affected by physical errors such as eccentricity and track pitch deviation. It is possible to carry out with higher accuracy.

  In another aspect of the embodiment of the information recording medium of the present invention, the recording density in the recording track of the one recording layer (guide layer) and the other recording of the first recording layer and the second recording layer are recorded. The ratio of the recording density of the recording track of the layer can be close to the square of the reciprocal of the ratio of the lengths of the first track pitch and the second track pitch compared to 1: 1. .

  According to this aspect, the recording density in the recording track of one recording layer and the recording of the other recording layer that are close to the square of the reciprocal of the ratio of the lengths of the first track pitch and the second track pitch. Based on the ratio to the recording density in the track, information can be recorded or reproduced in at least the other recording layer with high accuracy without being affected by physical errors such as eccentricity and track pitch deviation. Is possible.

  In another aspect of the embodiment of the information recording medium of the present invention, the recording density in the recording track of the one recording layer (guide layer) and the other recording of the first recording layer and the second recording layer are recorded. The ratio of the recording density in the recording track of the layer is (i) the reciprocal of the ratio of the lengths of the first track pitch and the second track pitch, and (ii) the integral multiple of the reciprocal of the length ratio ( It is approximately equal to the square of the reciprocal of the length ratio.

  According to this aspect, (i) the reciprocal of the ratio of the lengths of the first track pitch and the second track pitch, (ii) an integer multiple of the reciprocal, and (iii) the square of the reciprocal is substantially (substantially). Based on the ratio of the recording density in the recording track of one recording layer and the recording density in the recording track of the other recording layer, the recording or reproduction of information in at least the other recording layer is performed with an eccentricity or track pitch. It is possible to carry out with higher accuracy without being affected by physical errors such as deviation.

  In the recording density mode described above, the recording density includes (i) a recording linear density indicating a recordable amount of information per unit length in the recording track, and (ii) recording per unit time in the recording track. You may comprise so that it may be shown by at least one of the recording linear velocities which show the length which can be reproduced | regenerated.

  According to this configuration, information recording or reproduction on at least the other recording layer is performed based on the recording linear density and the recording density indicated by the recording linear velocity, and physical errors such as eccentricity and track pitch deviation are reduced. It is possible to carry out with higher accuracy without being affected.

  In another aspect of the embodiment of the information recording medium of the present invention, among one recording line segment in the recording track of the one recording layer (guide layer), the first recording layer, and the second recording layer The other recording line segments in the recording track of the other recording layer can be uniquely associated based on the ratio of the lengths of the first track pitch and the second track pitch.

  According to this aspect, on the basis of one recording line segment and the other recording line segment uniquely corresponding to the one recording line segment, recording or reproduction of information in at least the other recording layer is eccentric. In addition, it is possible to carry out with higher accuracy without being affected by physical errors such as deviation of track pitch and the like.

  In another aspect of the embodiment of the information recording medium of the present invention, the recording track of the other recording layer of the first recording layer and the second recording layer is a dedicated linking area for linking the recording information Have

  According to this aspect, since a plurality of recording information is appropriately linked in the linking-dedicated area, it is possible to record or reproduce information in at least the other recording layer with higher accuracy.

  In another aspect of the embodiment of the information recording medium of the present invention, the first recording layer and the second recording layer can be recorded or reproduced based on a predetermined unit (sector or ECC block). is there.

  According to this aspect, it is possible to record or reproduce information in the first and second recording layers with higher accuracy based on a predetermined unit (for example, a sector or an ECC block).

  In another aspect of the embodiment of the information recording medium of the present invention, the first recording layer and the second recording layer can be recorded or reproduced substantially simultaneously.

  According to this aspect, information can be recorded or reproduced by a plurality of types of laser beams substantially (substantially) simultaneously.

  In another aspect of the embodiment of the information recording medium of the present invention, the track pitch of the one recording layer (guide layer) is a laser beam that holds the wavelength of light of substantially blue to substantially blue-violet as an optical characteristic. Correspond.

  According to this aspect, a recording layer such as BD-ROM / R / RW or HD-DVD can be applied as one recording layer (guide layer).

  In another aspect of the embodiment of the information recording medium of the present invention, the track pitch of the other recording layer of the first recording layer and the second recording layer has an optical characteristic of the wavelength of substantially red light. Corresponds to the laser beam to be held.

  According to this aspect, a recording layer such as a CD-ROM or a DVD-ROM can be applied as the other recording layer.

  In another aspect of the embodiment of the information recording medium of the present invention, at least one of the first recording layer and the second recording layer has the guide track in the one recording layer (guide layer). An identification information recording area capable of recording identification information (flag) indicating whether or not formed is provided.

  According to this aspect, for example, an information processing apparatus such as a DVD recorder can quickly and accurately identify whether or not a guide track is formed on an information recording medium to be recorded or reproduced, and can quickly and accurately identify the information recording medium. It becomes possible to record or reproduce accurately.

(Embodiment of information processing apparatus)
Hereinafter, an information processing apparatus according to an embodiment of the present invention will be described.

  Embodiments according to the information processing apparatus of the present invention are capable of recording or reproducing recording information including first information based on a first track pitch corresponding to a first wavelength of a first laser beam. A recording layer; and at least a second recording layer capable of recording or reproducing recording information including second information based on a second track pitch corresponding to a second wavelength of the second laser beam, In one of the first recording layer and the second recording layer (guide layer), a guide track capable of detecting clock information or address information for recording or reproducing the recording information is formed. Recording or reproduction of recording information including the second information is performed on at least the second recording layer (L1 layer) with respect to the information recording medium by laser light transmitted through the first recording layer (L0 layer). Information processing Tracking control means for performing tracking control in at least one recording layer (guide layer) based on the guide track, (i) the tracking control, and (ii) the first track pitch, Based on the ratio of the length to the second track pitch, recording information including the second information is recorded on or reproduced from the other recording layer of the first recording layer and the second recording layer. And processing means.

  According to the embodiment of the information processing apparatus of the present invention, the tracking control unit performs tracking control on at least one recording layer (guide layer) based on the guide track. At the same time or before and after, the recording / reproducing means performs recording or reproduction on the other recording layer based on the ratio of the lengths of the first track pitch and the second track pitch. In particular, the information processing apparatus of the present invention includes an information recording apparatus, an information reproducing apparatus, and an information recording / reproducing apparatus.

  As a result, with reference to the guide track formed in one recording layer, the recording or reproduction of information in the other recording layer is highly accurate without being affected by physical errors such as eccentricity and track pitch deviation. Can be done.

  Incidentally, in response to the various aspects of the embodiment of the information recording medium of the present invention described above, the embodiment of the information processing apparatus of the present invention can also adopt various aspects.

(Embodiment of information processing method)
Hereinafter, an information processing method according to an embodiment of the present invention will be described.

  Embodiments according to the information processing method of the present invention are capable of recording or reproducing recording information including first information based on a first track pitch corresponding to the first wavelength of the first laser beam. A recording layer; and at least a second recording layer capable of recording or reproducing the recording information including the second information based on a second track pitch corresponding to the second wavelength of the second laser beam, A guide track capable of detecting clock information or address information for recording or reproducing the recording information is formed in one of the first recording layer and the second recording layer (guide layer). The recorded information including the second information is recorded on or reproduced from at least the second recording layer (L1 layer) by the laser beam transmitted through the first recording layer (L0 layer) with respect to the existing information recording medium. Information to do A tracking control step of performing tracking control in at least one recording layer (guide layer) based on the guide track, (i) the tracking control, and (ii) the first track pitch, Based on the ratio of the length to the second track pitch, the recording information including the second information is recorded on or reproduced from the other recording layer of the first recording layer and the second recording layer. Processing steps to be performed.

  According to the embodiment of the information processing method of the present invention, it is possible to receive various benefits of the above-described embodiment of the information processing apparatus of the present invention. In particular, the information processing method of the present invention includes an information recording method, an information reproducing method, and an information recording / reproducing method.

  Incidentally, in response to the various aspects of the embodiment of the information processing apparatus of the present invention described above, the embodiment of the information processing method of the present invention can also adopt various aspects.

(Embodiment of computer program)
Hereinafter, a computer program according to an embodiment of the present invention will be described.

  The computer program for process control of the present invention is a computer program for process control for controlling a computer provided in the above-described embodiment (including various aspects thereof) of the information processing apparatus of the present invention, The computer is caused to function as at least a part of the tracking control unit and the processing unit.

  According to the embodiment of the computer program according to the present invention, if the computer program is read and executed from an information recording medium such as a ROM, a CD-ROM, a DVD-ROM, and a hard disk storing the computer program, Alternatively, if the computer program is executed after being downloaded to a computer via communication means, the above-described embodiment of the information processing apparatus of the present invention can be realized relatively easily.

  Incidentally, in response to the various aspects of the embodiment of the information processing apparatus of the present invention described above, the embodiments of the computer program of the present invention can also adopt various aspects.

  Such an operation and other advantages of the present embodiment will be clarified from examples described below.

  As described above, according to the embodiment of the information recording medium of the present invention, the first recording layer capable of recording or reproducing the recording information based on the first track pitch, and the second track pitch. And a second recording layer (DVD) capable of recording or reproducing recorded information, and a guide track is formed in one recording layer (guide layer). As a result, it is possible to simplify the structure of an information recording medium having a plurality of recording layers. For example, in the manufacturing process including a vapor deposition process and a sputtering process, adjustment of various physical parameters is simplified or omitted. Thus, the manufacturing cost can be reduced. In addition, the recording or reproduction of information in a plurality of recording layers with the guide track formed in one (one) recording layer as a reference is affected by physical errors such as eccentricity and track pitch deviation. And can be performed with high accuracy. Furthermore, it is possible to record or reproduce information with a plurality of types of laser beams substantially (substantially) simultaneously or in succession.

  According to the embodiment of the information processing apparatus and method of the present invention, it comprises a tracking control means and process, and a processing means and process. As a result, with reference to the guide track formed in one recording layer, the recording or reproduction of information in the other recording layer is highly accurate without being affected by physical errors such as eccentricity and track pitch deviation. Can be done.

  Further, according to the embodiment of the computer program of the present invention, since the computer functions as the above-described embodiment of the information processing apparatus of the present invention, the information processing apparatus is used as a guide formed on one recording layer. With the track as a reference, it is possible to record or reproduce information on the other recording layer with high accuracy without being affected by physical errors such as eccentricity and track pitch deviation.

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

(1) Information Recording Medium of the Present Invention The first embodiment relating to the information recording medium of the present invention will be described below with reference to FIGS.

(1-1) Basic Configuration First, an outline of a basic configuration of an optical disc according to the first embodiment of the information recording medium of the present invention will be described with reference to FIG. FIG. 1 is a schematic plan view (FIG. 1 (a)) showing the basic configuration of the optical disc 100 according to the first embodiment of the information recording medium of the present invention, and the optical disc at the cutting plane “X”. It is a schematic sectional drawing (FIG.1 (b)).

  As shown in FIGS. 1 (a) and 1 (b), an optical disc 100 is formed on a recording surface on a disc body having a diameter of about 12 cm, for example, in the same manner as a DVD. A recording area is provided. However, this shape and size are not limited thereto, and it goes without saying that various sizes and shapes may be adopted. Further, a recording layer such as the L0 layer related to the first recording layer of the present invention and the L1 layer related to the second recording layer of the present invention is laminated on the transparent substrate of the optical disc 100, for example. Further, 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. Furthermore, data is divided and recorded in units of ECC blocks 11 on the track 10. The ECC block 11 is a data management unit in which recorded information can be error-corrected.

  As shown in FIG. 1B, the optical disc 100 according to the first embodiment is a multilayer information recording medium in which a plurality of recording layers such as a two-layer type are stacked. Specifically, for example, when viewed from the side irradiated with the two types of laser beams LB1 and LB2 (the lower side in FIG. 1B), the polycarbonate layer 104, such as BD (Blu-ray Disc) or HD-DVD, is used. A first recording layer 101 such as (High Definition-DVD), an intermediate layer 103, a second recording layer 102 such as a CD or a DVD, and a polycarbonate layer 105 are provided. When recording or reproducing the multilayer optical disc 100, in which recording layer the condensing position (focusing position) of the laser light irradiated from the lower side to the upper side in FIG. Accordingly, recording and reproduction are performed in the L0 layer or the L1 layer.

  More specifically, the first recording layer 101 is a recording layer that can record or reproduce a recording mark with a laser beam LB1 that retains recording power or reproduction power. Here, the laser beam LB1 according to the first embodiment is a laser beam having a relatively short wavelength such as a blue-ray having a wavelength of 405 nm, for example. A specific example of the first recording layer 101 may be a read-only BD-ROM, a write-once BD-R, or a rewritable BD-RW. The second recording layer 102 is a recording layer capable of recording or reproducing a recording mark with a laser beam LB2 that retains recording power or reproduction power. In the second recording layer 102, a total reflection film capable of reflecting the laser beam LB2 may be laminated. Here, the laser beam LB2 according to the first embodiment is, for example, a red laser beam having a wavelength of 650 nm or a laser beam having a relatively long wavelength such as infrared light. Further, the intermediate layer 103 maintains a predetermined thickness centered on, for example, 55 μm. The polycarbonate layers 104 and 105 may be configured to have a thickness of 0.6 mm, for example.

  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 double-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.

(1-2) Detailed Configuration Next, the detailed configuration of the optical disc according to the embodiment of the information recording medium of the present invention will be described with reference to FIGS. FIG. 2 is a schematic sectional view schematically showing an information recording medium such as a hybrid type optical disc provided with a recording layer on which guide tracks are formed according to the present invention. FIG. 3 is a schematic perspective view schematically showing an information recording medium such as a hybrid type optical disc provided with a recording layer on which guide tracks are formed according to the present invention. FIG. 4 is an enlarged plan view schematically showing an information recording medium such as a hybrid type optical disc having a recording layer on which guide tracks are formed according to the present invention.

  First, as shown in FIGS. 2 and 3, a guide track GT is formed in the first recording layer (hereinafter referred to as “L0 layer” as appropriate as described above). Here, the “guide track” according to the present invention is (i) the clock information or the address information can be detected by the laser beam LB1 such as Blu-ray, and the tracking in the first recording layer such as the L0 layer. Based on the control, it is a recording track that enables tracking control in the second recording layer such as the L1 layer by a laser beam LB2 such as a red laser beam. On the other hand, no guide track is formed in the second recording layer (hereinafter referred to as “L1 layer” as appropriate as described above).

  Accordingly, as shown in FIG. 4, (i) a guide track GT that is tracked (followed) by a laser beam LB1 having a small light spot diameter such as Blu-ray, and (ii) a light spot such as a red laser beam. It is possible to uniquely correspond to a virtual recording track virtually tracked (followed) by the laser beam LB2 having a large diameter based on each track pitch. Specifically, based on the ratio of the track pitch (0.15 μm) in the laser beam LB1 and the track pitch (0.6 μm) in the laser beam LB2, four guide tracks GT tracked by the laser beam LB1 The laser beam LB2 can uniquely correspond to one virtual recording track virtually tracked.

(1-3) Correspondence Relationship between Guide Track and Virtual Recording Track Next, referring to FIGS. 5 and 6, for example, a guide track GT tracked by a laser beam LB1 such as Blu-ray, and (ii) For example, a specific example of a correspondence relationship with a virtual recording track virtually tracked by a laser beam LB2 such as a red laser beam will be described. FIG. 5 schematically shows the correspondence between the guide track of the first recording layer (L0 layer) and the recording line segment in the virtual recording track of the second recording layer (L1 layer) according to the present invention. It is the shown schematic diagram. FIG. 6 is a diagram schematically showing the recording or reproducing direction of the guide track GT of the first recording layer (L0 layer) and the virtual recording track of the second recording layer (L1 layer) according to the present invention. FIG. 6 is a schematic diagram (FIG. 6A) and another schematic diagram (FIG. 6B). In FIG. 5, a dotted line indicates a guide track GT that is followed in the first recording layer (L0 layer) by the laser beam LB1, and a thick line in the second recording layer (L1 layer) by the laser beam LB2. , Shows a virtual recording track to be followed.

  As shown in FIG. 5, (i) four guide tracks GT tracked by the laser beam LB1, that is, track numbers are “N (where N is a natural number)”, “N + 1”, “N + 2”, “N + 3”. And (ii) one recording track virtually tracked by the laser beam LB2, four recording areas, that is, a first area A1, a second area A2, The four recording line segments divided by the third area A3 and the fourth area A4 can be uniquely associated.

  In detail, as shown in FIG. 5A, the laser beam LB1 is guided by the guide track GT of the track number “N” of the first recording layer (L0 layer) (see the dotted line in FIG. 5A). When the laser beam LB2 follows the recording line segment (see FIG. 5A) divided by the first area A1 in the virtual recording track of the second recording layer (L1 layer). (See the thick line). In substantially the same manner, as shown in FIG. 5B, the laser beam LB1 is referred to the guide track GT of the track number “N + 1” of the first recording layer (L0 layer) (see the dotted line in FIG. 5B). ), The laser beam LB2 is divided by the second area A2 in the virtual recording track of the second recording layer (L1 layer) (in FIG. 5B). (See the thick line). Further, in substantially the same manner, as shown in FIG. 5C, the laser beam LB1 is guided by the guide track GT of the track number “N + 2” of the first recording layer (L0 layer) (dotted line in FIG. 5C). In the case where the laser beam LB2 follows the recording line segment divided by the third area A3 in the virtual recording track of the second recording layer (L1 layer) (FIG. 5C). ) (See the thick line in the figure)). Furthermore, in substantially the same manner, as shown in FIG. 5D, the laser beam LB1 is guided by the guide track GT (FIG. 5D) having the track number “N + 3” of the first recording layer (L0 layer). When following the dotted line), the laser beam LB2 is recorded on the recording line segment divided by the fourth area A4 in the virtual recording track of the second recording layer (L1 layer) (FIG. 5 ( d) (See the thick line in the figure)).

  More specifically, as shown in FIG. 6A, under the opposite method in which the recording / reproducing direction of the L0 layer is opposite to the recording / reproducing direction of the L1 layer, the above-described guide track GT of the L0 layer is used. As the track number increases to “N”, “N + 1”, “N + 2”, “N + 3” and the tracking position moves to the outer peripheral side, the tracking position on the virtual recording track in the L1 layer becomes the inner peripheral side. You may make it move to. Alternatively, as shown in FIG. 6B, under the parallel system in which the recording / reproducing direction of the L0 layer and the recording / reproducing direction of the L1 layer are the same direction, the tracks in the above-described guide track GT of the L0 layer The numbers increase as “N”, “N + 1”, “N + 2”, “N + 3”, and the tracking position on the virtual recording track in the L1 layer also moves to the outer circumferential side as the tracking position moves to the outer circumferential side. It may be.

  In this embodiment, the correspondence is determined based on the ratio of the track pitch (0.15 μm) in the laser beam LB1 to the track pitch (0.6 μm) in the laser beam LB2, that is, “1: 4”. However, the correspondence may be determined based on other ratios such as “1 to 6” or “integer multiple of 1 to 4 (natural number greater than or equal to 2)”. Specifically, when the correspondence is determined based on the ratio of “1 to 8 (2 times 4)”, (i) four guide tracks GT tracked by the laser beam LB1, that is, track numbers And (ii) one virtual recording that is virtually tracked by the laser beam LB2 with “N (where N is a natural number)”, “N + 1”, “N + 2”, “N + 3”, and (ii) the laser beam LB2. Of the tracks, a set of recording line segments (ie, a set of four recording line segments), each of which is divided into eight on the optical disc, and two of the eight recording line segments divided by the eight recording areas. You may make it respond | correspond uniquely. The correspondence relationship based on the ratio may be realized on average in the entire recording area. Alternatively, the correspondence relationship may be determined based on a ratio approximately indicated by an integer.

  In particular, the smaller the ratio is set to, for example, “1 to 16”,..., “1 to 12”,. Therefore, it is possible to realize more efficient use of guide tracks GT or virtual recording tracks based on the correspondence. On the other hand, the larger the setting, such as “1 to 8”,..., “1 to 12”,. It becomes possible to realize the recording or reproducing operation of the L0 layer and the L1 layer.

(2) Information Processing Device Next, an embodiment of the information processing device of the present invention will be described in detail with reference to FIGS. In particular, the present embodiment is an example in which the information processing apparatus according to the present invention is applied to an information recording / reproducing apparatus for an optical disc.

(2-1) Basic Configuration First, the basic configuration of the information recording / reproducing apparatus 300 and the host computer 400 in the embodiment according to the present invention will be described with reference to FIG. FIG. 7 is a block diagram showing the basic configuration of the information recording / reproducing apparatus and the host computer according to the embodiment of the present invention. FIG. 8 is a schematic diagram schematically showing two types of optical paths in the information recording / reproducing apparatus according to the embodiment of the present invention. FIG. 9 is a plan view (FIG. 9A) schematically showing one specific example of the light receiving means such as a photodetector in FIG. 8, and a schematic view (FIG. 9) schematically showing a modification. (B)). 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 a CPU (Central Processing Unit) 305 for driving.

  The information recording / reproducing apparatus 300 includes an optical disc 100, an optical pickup 301, a signal recording / reproducing unit 302, an address detecting unit 303, an address calculating unit 304, a CPU (drive control unit) 305, a spindle motor 306, a memory 307, and a data input / output control unit. 308 and a bus 309.

  The host computer 400 includes a CPU (host control means) 401, a memory 402, operation control means 403, operation buttons 404, a display panel 405, data input / output control means 406, and a bus 407.

  In particular, the information recording / reproducing apparatus 300 may be configured to be communicable with an external network by housing the host computer 400 equipped with communication means such as a modem in the same housing. Alternatively, for example, the CPU (host control means) 405 of the host computer 400 having communication means such as i-link directly connects the information recording / reproducing apparatus 300 via the data input / output control means 308 and the bus 309. You may comprise so that it can communicate with an external network by controlling.

  The optical pickup 301 performs recording and reproduction on the optical disc 100, and includes a semiconductor laser device and a lens. More specifically, the optical pickup 301 irradiates the optical disc 100 with a light beam such as blue-ray, red laser light, or infrared light as read light during reproduction at a reproduction level laser power. During recording, the recording light is irradiated while being modulated with a recording level laser power.

  The signal recording / reproducing means 302 records and reproduces the optical disc 100 by controlling the optical pickup 301 and the spindle motor 306. Specifically, as shown in FIG. 8, the signal recording / reproducing means 302 is (i) a laser diode driver that drives a semiconductor laser such as a blue LD (laser diode) 302b and a red LD (laser diode) 302r. (LD driver) 302LD, (ii) For example, it is constituted by a photodetector 302f divided in two and a head amplifier (not shown).

  The optical paths of the laser beams LB1 and LB2 in the signal recording / reproducing means 302 will be described. For example, a laser beam LB1 such as Blu-ray is emitted from the blue LD 302b, and is irradiated onto a guide track formed in the L0 layer via a reflector Mir1 and a polarizing beam splitter PBS. The laser beam LB1 reflected by the L0 layer is received by the photodetector 302f via the polarization beam splitter PBS. Similarly, for example, laser light LB2 such as red LD light is emitted from the red LD 302r, and is irradiated onto a virtual recording track in the L1 layer via the reflector Mir2 and the polarization beam splitter PBS. Then, the laser beam LB2 reflected by the L1 layer is received by the photodetector 302f via the polarization beam splitter PBS.

  In particular, tracking control in the L0 layer is performed by detecting a difference in the amount of light (or phase) received by each of the 12-divided photodetectors 302f, for example. Then, based on tracking control in the L0 layer, virtual tracking control in the L1 layer can be performed. Note that the photodetector 302f may include a light receiving region for the laser beam LB1 and a light receiving region for the laser beam LB2, as shown in FIG. 9A. Further, as shown in FIG. 9B, the optical path is divided through the polarization beam splitter PBS2, so that the laser beam LB1 is received by the photodetector 302fb and the laser beam LB2 is received by the photodetector 302fr. Also good.

  A head amplifier (not shown) amplifies the output signal of the optical pickup 301, that is, the reflected light of the light beam, and outputs the amplified signal. More specifically, the signal recording / reproducing means 302 determines the optimum laser power by OPC pattern recording and reproduction processing together with a timing generator (not shown) under the control of the CPU 305, for example, during OPC (Optimum Power Control) processing. A semiconductor laser (not shown) provided in the optical pickup 301 is driven so that it can be performed.

  As described above, the signal recording / reproducing means 302 constitutes an example of the “recording means”, “reproducing means”, and “recording / reproducing means” according to the present invention together with the optical pickup 301.

  A CPU (drive control means) 305 controls the entire information recording / reproducing apparatus 300 by giving instructions to various means via the bus 309. Software or firmware for operating the CPU 305 is stored in the memory 307. The CPU (drive control means) 305, together with a CPU (host control means) 401 described later, constitutes an example of the “tracking control means” according to the present invention.

  The spindle motor 306 rotates and stops the optical disc 100 and operates when accessing the optical disc. More specifically, the spindle motor 306 is configured to rotate and stop the optical disc 100 at a predetermined speed while receiving spindle servo from a servo unit (not shown) or the like.

  The memory 307 is used in general data processing and OPC processing in the information recording / reproducing apparatus 300, such as a buffer area for recording data and reproduction data, and an area used as an intermediate buffer for conversion to data usable by the signal recording / reproducing means 302. Is done. The memory 307 stores a program for operating as the recorder device, that is, a ROM area in which firmware is stored, a buffer for temporarily storing recording / playback data, variables necessary for the operation of the firmware program, and the like. It consists of a RAM area and the like.

  The data input / output control means 308 controls external data input / output with respect to the information recording / reproducing apparatus 300, and stores and retrieves data in / from the data buffer on the memory 307. A drive control command issued from the information recording / reproducing apparatus 300 and an external host computer 400 (hereinafter referred to as a host as appropriate) connected to the information recording / reproducing apparatus 300 via an interface such as SCSI or ATAPI is sent to the data input / output control means 308. Via CPU 305. Similarly, recorded data and reproduced data are transmitted to and received from the host computer 400 via the data input / output control means 308.

  In the host computer 400, the CPU (host control means) 401, the memory 402, the data input / output control means 406, and the bus 407 are generally the same as the corresponding components in the information recording / reproducing apparatus 300.

  In particular, the operation control unit 403 receives and displays an operation instruction with respect to the host computer 400, and transmits an instruction by the operation button 404 such as recording or reproduction to the CPU 401. The CPU 401 transmits a control command (command) to the information recording / reproducing apparatus 300 via the data input / output means 406 based on the instruction information from the operation control means 403 to control the entire information recording / reproducing apparatus 300. You may comprise as follows. Similarly, the CPU 401 can transmit a command requesting the information recording / reproducing apparatus 300 to transmit the operation state to the host. Thus, since the operation state of the information recording / reproducing apparatus 300 such as recording or reproduction can be grasped, the CPU 401 displays the operation state of the information recording / reproducing apparatus 300 on the display panel 405 such as a fluorescent tube or LCD via the operation control means 403. Can be output.

  One specific example in which the information recording / reproducing apparatus 300 and the host computer 400 described above are used in combination is a household device such as 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. An operation as a recorder device is performed by causing the CPU 401 to execute a program stored in the memory 402. In another specific example, the information recording / reproducing apparatus 300 is a disk drive (hereinafter referred to as a drive as appropriate), and the host computer 400 is a personal computer or a workstation. A host computer such as a personal computer and a drive are connected via data input / output control means 308 (406) such as SCSI and ATAPI, and an application such as writing software installed in the host computer controls the disk drive.

(2-2) Recording or playback operation (recording or playback method)
Next, with reference to FIG. 10, the recording or reproducing operation by the information recording / reproducing apparatus (information processing apparatus) for the information recording medium of the present invention, that is, the recording or reproducing method of the information recording medium of the present invention will be described. FIG. 10 is a flowchart showing a specific example of the recording or reproducing operation by the information recording / reproducing apparatus for the information recording medium of the present invention.

  As shown in FIG. 10, when the optical disc 100 is loaded, under the control of the control unit such as the CPU 305, the reading unit such as the optical pickup 301 or the signal recording / reproducing unit 302 performs the initial operation as a control data zone or the like. Various types of management information recorded in the management information recording area are acquired (step S101).

  Next, under the control of a control unit such as the CPU 305, the guide track formed in the L0 layer is irradiated with a laser beam LB1 such as Blu-ray, for example, and tracking control is performed (step S102).

  Simultaneously with or before or after step S102, under the control of a control unit such as the CPU 305, the L1 layer is irradiated with laser light LB2 such as red LD light, for example, and focusing control is performed (step S103).

  It is determined whether or not information is recorded or reproduced at least in the L1 layer under the control of the control means such as the CPU 305 at the same time as step S102 and step S103 (step S104). Here, when recording or reproducing information (step S104: Yes), at least the L1 layer is irradiated with a laser beam LB2 such as red LD light under the control of a control unit such as the CPU 305, and information recording or reproduction is performed. Reproduction is performed (step S105). On the other hand, when information is not recorded or reproduced (step S104: No), it may be determined again whether information is recorded or reproduced (step S104).

  Next, it is determined whether or not to end the recording or reproducing operation under the control of the control means such as the CPU 305 (step S106). Here, when the recording or reproducing operation is ended (step S106: Yes), the series of processes is ended. On the other hand, when the recording or reproducing operation is not finished (step S106: No), the information is recorded or reproduced again (step S105).

(3) Second to Sixth Embodiments of Information Recording Medium of the Present Invention Next, second to sixth embodiments of the information recording medium of the present invention will be described.

(3-1) Detailed Configuration of Information Recording Medium According to Second to Sixth Embodiments A detailed configuration according to second to sixth embodiments of the information recording medium of the present invention will be described with reference to FIG. FIG. 11 is a table showing a basic configuration centering on the recording layer on which the guide track is formed in the second to sixth embodiments of the information recording medium of the present invention. The basic configuration and recording / reproducing method according to the second to sixth embodiments are substantially the same as those of the first embodiment, and a description thereof will be omitted.

  As shown in FIG. 11, in the second embodiment of the information recording medium of the present invention, the recording layer on which the guide track is formed is different from that in the first embodiment. For example, the laser beam LB2 such as red LD is irradiated. A guide track is formed in a second recording layer (L1 layer) such as a DVD. On the other hand, a guide track is not formed in the first recording layer (L0 layer) such as BD irradiated with the laser beam LB1 such as Blu-ray. Therefore, contrary to the description in FIG. 5 described above, for example, (i) four recording areas of one guide track tracked by the laser beam LB2, that is, the first area A1, the second area A2, Four recording line segments divided by the third area A3 and the fourth area A4, and (ii) four virtual recording tracks virtually tracked by the laser beam LB1, that is, the track number is “N (Where N is a natural number), “N + 1”, “N + 2”, and “N + 3” virtual recording tracks can be uniquely associated.

  As shown in FIG. 11, the third and fourth embodiments according to the information recording medium of the present invention are different in basic configuration from the first embodiment, and are irradiated with laser light LB2 such as red LD, for example. The DVD or the like is the first recording layer (L0 layer) on the optical pickup side (front side), and for example, the BD irradiated with the laser beam LB1 such as Blu-ray is the second recording on the back side (back side) of the optical pickup. Layer (L1 layer). In the third embodiment, guide tracks are formed in the first recording layer (L0 layer), and in the fourth embodiment, guide tracks are formed in the second recording layer (L1 layer). Accordingly, in the third embodiment, as in the second embodiment, (i) four recording line segments divided among one guide track tracked by the laser beam LB2, and (ii) the laser The four virtual recording tracks virtually tracked by the light LB1 can be uniquely associated. In the fourth embodiment, as in the first embodiment, (i) four guide tracks tracked by the laser beam LB1 and (ii) one track virtually tracked by the laser beam LB2. Among the virtual recording tracks, it is possible to uniquely correspond to the four divided recording line segments.

  Further, as shown in FIG. 11, the fifth and sixth embodiments relating to the information recording medium of the present invention are developed from the first embodiment and are provided with three recording layers. In the fifth embodiment, a third recording layer such as a DVD, which can be recorded or reproduced by the laser beam LB2, is provided. The sixth embodiment includes a third recording layer such as a CD that can be recorded or reproduced by a laser beam such as infrared light, which is a third type of laser light different from the laser beams LB1 and LB2. Has been.

(4) Seventh Embodiment of Information Recording Medium of the Present Invention Next, a seventh embodiment of the information recording medium of the present invention will be described.

(4-1) Management Information First, a specific example of management information according to the seventh embodiment will be described with reference to FIG. FIG. 12 shows identification information (flag) indicating whether or not a guide track is formed in one recording layer such as the L0 layer according to the seventh embodiment of the information recording medium of the present invention. It is a table showing management information including.

  As shown in FIG. 12, for example, a control data zone that is a part of the recording area of the first recording layer (L0 layer) or the second recording layer (L1 layer) (ie, the “identification information recording area” according to the present invention). Management information recorded in (one specific example) is (i) information indicating that it is a two-layer type or a single-layer type, and (ii) a guide track according to the present invention in the first recording layer (L0 layer). And (iii) identification information (flag) indicating whether or not the guide track according to the present invention is formed in the second recording layer (L1 layer). It may be included.

  As a result, for example, an information recording / reproducing apparatus (information processing apparatus) such as a DVD recorder can quickly and accurately identify whether or not a guide track is formed in an information recording medium to be recorded or reproduced, and the information recording medium Can be recorded or reproduced quickly and accurately.

  According to the first to seventh embodiments described above, the structure of an information recording medium having a plurality of recording layers can be simplified, so that the manufacturing process can be simplified and the manufacturing cost can be reduced. Is possible. Furthermore, recording or reproduction of information on a plurality of recording layers with reference to a guide track formed on one (one) recording layer is not affected by physical errors such as eccentricity and track pitch deviation. It is possible to carry out with high precision. In addition, information can be recorded or reproduced by a plurality of types of laser beams substantially (substantially) simultaneously or in succession.

  In the embodiment described above, as a specific example of the information recording medium, a two-layer or three-layer hybrid type optical disc that can be recorded or reproduced by a plurality of types of laser beams such as Blu-ray, red LD light, or infrared light, for example. Explained. In addition, the present invention can also be applied to, for example, a multilayer (multiple layer type) optical disc having four or more recording layers. Furthermore, the present invention can be applied to various information recording media compatible with other high-density recording or high transfer rate.

  In the above-described embodiments, an information recording / reproducing apparatus corresponding to, for example, a two-layer or three-layer hybrid optical disk has been described as a specific example of the information processing apparatus. In addition, the present invention can also be applied to an information recording / reproducing apparatus compatible with, for example, a multilayer (multiple layer type) optical disc having four or more recording layers. Furthermore, the present invention can also be applied to an information recording / reproducing apparatus compatible with various information recording media compatible with other high-density recording or high transfer rate.

  The present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit or idea of the invention that can be read from the claims and the entire specification, and an information recording medium with such a change The information processing apparatus and method, and the computer program for processing control are also included in the technical scope of the present invention.

FIG. 1A is a schematic plan view showing the basic configuration of an optical disc 100 according to a first embodiment of the information recording medium of the present invention, and FIG. b)). 1 is a schematic cross-sectional view schematically showing an information recording medium such as a hybrid type optical disc having a recording layer on which guide tracks according to the present invention are formed. 1 is a schematic perspective view schematically showing an information recording medium such as a hybrid type optical disc provided with a recording layer on which guide tracks according to the present invention are formed. 1 is an enlarged plan view schematically showing an information recording medium such as a hybrid type optical disc provided with a recording layer on which a guide track according to the present invention is formed. FIG. 3 is a schematic diagram schematically showing a correspondence relationship between a guide track of a first recording layer (L0 layer) and a recording line segment in a virtual recording track of a second recording layer (L1 layer) according to the present invention. 1 is a schematic diagram schematically showing the recording or reproducing direction of the guide track GT of the first recording layer (L0 layer) and the virtual recording track of the second recording layer (L1 layer) according to the present invention (FIG. 6 (a)) and another schematic diagram (FIG. 6 (b)). It is the block diagram which showed the basic composition of the information recording / reproducing apparatus based on the Example of this invention, and a host computer. It is the schematic diagram which showed typically two types of optical paths in the information recording / reproducing apparatus based on the Example of this invention. FIG. 8 is a plan view schematically showing a specific example of a light receiving means such as a photodetector (FIG. 9A), and a schematic view schematically showing a modified example (FIG. 9B). . It is the flowchart which showed the specific example of the recording or reproduction | regeneration operation | movement by the information recording / reproducing apparatus with respect to the information recording medium of this invention. 7 is a table showing a basic configuration centering on a recording layer on which guide tracks are formed in the second to sixth embodiments of the information recording medium of the present invention. Table showing management information including identification information (flag) indicating whether or not a guide track is formed in one recording layer such as the L0 layer, for example, according to the seventh embodiment of the information recording medium of the present invention. It is.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Optical disk, 300 ... Information recording / reproducing apparatus, 301 ... Optical pick-up, 302 ... Signal recording / reproducing means, 302LD ... Laser diode driver (LD driver), 302f (302fb, 302fr) ... Photo detector, Mir1 (Mir2) ... Reflector, PBS ... Polarizing Beam Splitter, 305 ... CPU (drive control means), 306 ... Spindle motor, 307 (402) ... Memory, 308 (406) ... Data input / output control means, 309 (407) ... Bus, 400: Host computer, 401: CPU (for host), 403: Operation control means, 404: Operation buttons, 405 ... Display panel, LB1 (LB2) ... Laser light, GT ... Guide track

Claims (17)

A first recording layer capable of recording or reproducing recording information including first information based on a first track pitch corresponding to a first wavelength of the first laser beam;
And at least a second recording layer capable of recording or reproducing recording information including the second information based on a second track pitch corresponding to the second wavelength of the second laser light,
A guide track capable of detecting clock information or address information for recording or reproducing the recording information is formed in one of the first recording layer and the second recording layer. Information recording medium.   The other recording layer of the first recording layer and the second recording layer has a length ratio of (i) the guide track and (ii) the first track pitch and the second track pitch. The information recording medium according to claim 1, wherein the recording information can be recorded or reproduced based on the information.   The ratio between the recording density of the recording track of the one recording layer and the recording density of the recording track of the other recording layer of the first recording layer and the second recording layer is compared with 1: 1. 3. The information recording medium according to claim 1, wherein the information recording medium can be approximate to a reciprocal of a ratio of a length of the first track pitch and the second track pitch.   The ratio between the recording density of the recording track of the one recording layer and the recording density of the recording track of the other recording layer of the first recording layer and the second recording layer is compared with 1: 1. 3. The method according to claim 1, wherein the first track pitch and the second track pitch can be close to an integral multiple of a reciprocal of a length ratio (a natural number multiple of 2 or more). Information recording media.   The ratio between the recording density of the recording track of the one recording layer and the recording density of the recording track of the other recording layer of the first recording layer and the second recording layer is compared with 1: 1. 3. The information recording medium according to claim 1, wherein the information recording medium can be made close to the square of the reciprocal of the length ratio between the first track pitch and the second track pitch.   The ratio between the recording density of the recording track of the one recording layer and the recording density of the recording track of the other recording layer of the first recording layer and the second recording layer is (i) the first track pitch. And the reciprocal of the ratio of the length to the second track pitch, (ii) an integer multiple of the reciprocal of the length ratio (a natural number multiple of 2), or (iii) the reciprocal of the ratio of the lengths. The information recording medium according to claim 1, wherein the information recording medium is substantially equal to a square.   The recording density includes (i) a recording linear density indicating a recordable amount of information per unit length in a recording track, and (ii) a length that can be recorded or reproduced per unit time in the recording track. The information recording medium according to claim 3, wherein the information recording medium is indicated by at least one of the recording linear velocities.   One recording line segment in the recording track of the one recording layer and the other recording line segment in the recording track of the other recording layer of the first recording layer and the second recording layer are the first track. 8. The information recording medium according to claim 1, wherein the information recording medium can uniquely correspond based on a ratio of a length of the pitch and the second track pitch. 9. .   9. The recording track of the other recording layer of the first recording layer and the second recording layer has a linking dedicated area for linking the recording information. The information recording medium according to one item.   The information recording according to any one of claims 1 to 9, wherein the first recording layer and the second recording layer can be recorded or reproduced based on a predetermined unit. Medium.   The information recording medium according to any one of claims 1 to 10, wherein the first recording layer and the second recording layer can be recorded or reproduced at substantially the same time.   The track pitch of the one recording layer corresponds to a laser beam that retains a wavelength of light of substantially blue to substantially blue-violet as an optical characteristic. The information recording medium described.   2. The track pitch of the other recording layer of the first recording layer and the second recording layer corresponds to a laser beam that retains the wavelength of substantially red light as an optical characteristic. The information recording medium according to any one of 12.   At least one of the first recording layer and the second recording layer includes an identification information recording area capable of recording identification information indicating whether or not the guide track is formed in the one recording layer. The information recording medium according to claim 1, wherein the information recording medium is a recording medium. A first recording layer capable of recording or reproducing recording information including the first information based on a first track pitch corresponding to the first wavelength of the first laser beam; and a second wavelength of the second laser beam. At least a second recording layer capable of recording or reproducing recording information including second information based on a second track pitch corresponding to the first recording layer, and the second recording layer A laser that has passed through the first recording layer with respect to an information recording medium on which one of the recording layers is formed with a guide track capable of detecting clock information or address information for recording or reproducing the recording information. An information processing apparatus that records or reproduces recording information including the second information with respect to at least the second recording layer by light,
Tracking control means for performing tracking control in at least one of the recording layers based on the guide track;
(I) the tracking control, and (ii) the other recording of the first recording layer and the second recording layer based on the ratio of the lengths of the first track pitch and the second track pitch. An information processing apparatus comprising: processing means for recording or reproducing recorded information including the second information with respect to a layer. A first recording layer capable of recording or reproducing recording information including the first information based on a first track pitch corresponding to the first wavelength of the first laser beam; and a second wavelength of the second laser beam. At least a second recording layer capable of recording or reproducing recording information including second information based on a second track pitch corresponding to the first recording layer, and the second recording layer A laser that has passed through the first recording layer with respect to an information recording medium on which one of the recording layers is formed with a guide track capable of detecting clock information or address information for recording or reproducing the recording information. An information processing method for recording or reproducing recorded information including the second information on at least the second recording layer by light,
A tracking control step for performing tracking control in at least one of the recording layers based on the guide track;
(I) the tracking control, and (ii) the other recording of the first recording layer and the second recording layer based on the ratio of the lengths of the first track pitch and the second track pitch. And a processing step of recording or reproducing the recording information including the second information with respect to the layer.   A computer program for processing control for controlling a computer provided in the information processing apparatus according to claim 15, wherein the computer is caused to function as at least part of the tracking control unit and the processing unit. A featured computer program.

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