KR100759910B1 - Information recording medium and information recording device and method - Google Patents

Abstract

The information recording medium of the present invention,

A first recording layer for recording first information which is at least part of the record information; And

One or a plurality of second recording layers disposed on the first recording layer for recording second information which is at least another part of the recording information.

Including,

Each layer of the second recording layers has a predetermined area in which power calibration is performed to detect an optimal recording power of a recording laser beam that has passed through the first recording layer and the other layers of the second recording layers. Each of the first recording layer, the other layers of the second recording layers, and the second recording layers are arranged in this order as viewed from the irradiation side of the laser light,

In the other layer of the second recording layers and the first recording layer, in the opposing area facing the predetermined area, by forming an emboss pit, the light transmittance of the opposing area is (i) (i-1) Compared to the light transmittance when the emboss pit is not formed and (i-2) the other layers and the first recording layer are assumed to be in an unrecorded state, (ii) (ii-1) the emboss pit (Ii-2) is closer to the light transmittance when the other layers and the first recording layer are assumed to be in a recording completion state.

Light transmittance, opposing area, information recording medium, information recording apparatus, information reproducing apparatus

Description

Information recording medium, and information recording apparatus and method {INFORMATION RECORDING MEDIUM AND INFORMATION RECORDING DEVICE AND METHOD}

The present invention relates to the technical field of information recording media such as, for example, DVDs, and information recording apparatuses and methods such as, for example, DVD recorders.

For example, in an information recording medium such as a CD and a DVD, a multi-layer or dual-layer optical disk or the like in which a plurality of recording layers are stacked on the same substrate has also been developed. In an information recording apparatus such as a CD recorder, which records information on such a dual-layer type (i.e., two-layer type) optical disc, a recording layer located in front or closest to the laser beam irradiation side (appropriately " By condensing the laser light for recording in the " LO layer ", information is recorded in the L0 layer by an irreversible change recording method or a rewritable method by heating or the like. Further, the irreversible change due to heating or the like is caused by condensing the laser light on a recording layer (hereinafter referred to as "L1 layer" as appropriate in this application) located at the back or farthest from the irradiation side of the laser light through the L0 layer or the like. Information is recorded on the L1 layer in a recordable or rewritable manner.

In the case of recording data information on this type of optical disc or the like, the optimal recording laser power (OPC) can be optimized by OPC (Optimum Power Control) processing depending on the type of optical disc, the type of information recording / reproducing apparatus, the recording speed, and the like. In the present application, " optimal recording power " is appropriately set. In other words, the recording power is calibrated. This makes it possible to realize an appropriate recording operation corresponding to variations in the characteristics of the information recording surface of the optical disc and the like. For example, when the optical disc is loaded and a write command is input, the light intensity is switched in turn, and data for test writing is recorded in the OPC area, so-called "test writing process" is executed. In particular, an OPC area is provided in each of the two recording layers, and a technique for performing OPC processing on each of these two layers is disclosed.

In addition, in the case of the two-layer type optical disc, it is necessary to appropriately correspond to two types of recording states in the L0 layer through which the laser beam passes, in connection with the detection of the optimum recording power in the L1 layer. This is usually because when the L0 layer is in the recording completion state, the light transmittance to the L1 layer in the L0 layer is lowered, which increases the value of the optimum recording power. On the other hand, when the L0 layer is in the unrecorded state, the light transmittance to the L1 layer in the L0 layer is relatively high, which reduces the value of the optimum recording power.

Therefore, as described in Patent Literature 1 and the like, when performing the OPC process in the L1 layer, first, data information is recorded in the L0 layer, and then the OPC process in the L1 layer is more appropriately performed. The technique to perform is also disclosed.

Patent Document 1: Japanese Patent Application Laid-Open No. 2001-52337

Disclosure of the Invention

Challenges the invention seeks to solve

However, in the above-described OPC process in the L1 layer, there is a technical problem that the process of setting the L0 layer through which the laser beam passes is in the recording state when detecting the optimum recording power.

Therefore, in order to solve the above-mentioned conventional problem, the present invention is, for example, a multi-layered information recording medium capable of performing test writing on each of a plurality of recording layers efficiently and recording recording information efficiently. And an information recording apparatus and method capable of efficiently recording information on such an information recording medium.

Means to solve the problem

(Information recording medium)

The above object of the present invention is achieved by an information recording medium, the information recording medium comprising: a first recording layer for recording first information which is at least part of the record information; And one or a plurality of second recording layers disposed on the first recording layer for recording second information which is at least another part of the recording information, wherein each layer of the second recording layers is the first recording layer. Said first recording layer, said other layers of said second recording layers, having a predetermined area where power calibration is performed to detect an optimal recording electrical power of a recording laser beam that has passed through a recording layer and other layers of said second recording layers And each layer of the second recording layers are arranged in this order as viewed from the irradiation side of the laser light, and in the other layer and the first recording layer of the second recording layers, in the opposite area facing the predetermined area. By forming an emboss pit, the light transmittance of the opposing area is (i) (i-1) the emboss pit is not formed, and (i-2) the other layers and the first recording layer. Compared to the light transmittance when it is assumed to be in the unrecorded state, (ii) (ii-1) the emboss pit is not formed, and (ii-2) the other layers and the first recording layer are in a recording completion state. It is closer to the light transmittance when assumed.

According to the information recording medium of the present invention, for example, a first recording layer and one or a plurality of second recording layers are stacked or stacked on one side of a disc-shaped substrate. The information recording medium is, for example, a DVD or an optical disc of a two-layer type or a multilayer type. In the first recording layer, for example, recording information such as audio, video information or content information can be recorded. In each layer of the second recording layer, for example, recording information such as audio, video information or content information can be recorded. Since it is comprised in this way, a recording or reproduction laser beam is irradiated in order of the board | substrate, the 1st recording layer, the other layer of a 2nd recording layer, and each layer of a 2nd recording layer. More specifically, if each layer of the second recording layer is counted from the direction in which the recording laser light is irradiated and is the second layer, no other layer of the second recording layer exists. If each layer of the second recording layer is the third layer, only another layer of the second recording layer exists. Further, if each layer of the second recording layer is the fourth layer, there are only two other layers of the second recording layer.

In each layer of the second recording layer, a predetermined area such as, for example, an OPC area is formed in which power calibration is performed to detect an optimum recording power of the recording laser light.

In the present invention, in particular, opposing regions facing the predetermined regions are formed in the other layers and the first recording layer of the second recording layer. By forming an emboss pit in this opposing area, the light transmittance of the recording laser beam can be adjusted. If the emboss pit is not formed in the other layer of the second recording layer and the opposing area of the first recording layer, in order to properly detect the optimum recording power in the predetermined area of each layer of the second recording layer, The information recording apparatus to be described later requires a process of bringing the other layer of the second recording layer through which the laser beam passes and the opposing area of the first recording layer into a recording completion state.

In contrast, according to the present invention, at the time of manufacturing an information recording medium such as an optical disc, an emboss pit is formed in the opposing area provided in the other layer of the second recording layer and the first recording layer. The light transmittance of each layer of the second recording layer in the predetermined region is determined by (i) (i-1) emboss pits not being formed and (i-2) other layers of the second recording layer and the first. Compared to the light transmittance assuming that the recording layer is in the unrecorded state, (ii) (ii-1) no emboss pit is formed and (ii-2) another layer and the first recording layer of the second recording layer. It is possible to be closer to the light transmittance in the case where it is assumed that it is in the recording completion state.

As described above, the light transmittance in the opposing area is (i) (i-1) that the emboss pit is not formed, and (i-2) another layer and the first recording layer of the second recording layer. Compared to the light transmittance when it is assumed to be in the unrecorded state, (ii) (ii-1) this emboss pit is not formed, and (ii-2) the other layer and the first recording layer of the second recording layer In order to form opposing regions in the other recording layer and the first recording layer of the second recording layer so as to be closer to the light transmittance when it is assumed that the recording is completed, for example, experimental, empirical or theoretical or simulation, etc. By forming this emboss pit, the desired light transmittance can be obtained individually and specifically.

In one aspect of the information recording medium of the present invention, the emboss pit is formed in the opposing area so that the light transmittance in the opposing area is not formed with the emboss pit and the other layer and the first layer. The light transmittance in the case where it is assumed that the recording layer is in the recording completion state is equivalent.

According to this aspect, it is possible to completely omit a recording operation for equalizing (or equalizing) the light transmittance of the opposing area to the light transmittance when the other layer and the first recording layer are assumed to be in a recording completion state. It is possible. Here, the term "equally" or "equally" includes not only "completely the same", but also the meaning of the same light transmittance to a degree that can be sufficiently identified when performing power calibration.

In another aspect of the information recording medium of the present invention, the predetermined area is smaller than the opposite area.

According to this aspect, the predetermined area where the OPC processing is performed in each layer of the second recording layer is smaller than the other area of the opposing second recording layer and the opposite area where emboss pits are formed in the first recording layer. Therefore, it becomes possible to secure a margin for influence of eccentricity between layers in the two-layer type optical disk, divergence of laser light, and the like. Therefore, it becomes possible to detect the value of the optimum recording power for each layer of the second recording layer more appropriately.

In another aspect of the information recording medium of the present invention, in the opposing area, encrypted information for encrypting or decrypting the record information is recorded by forming the emboss pit.

According to this aspect, an emboss pit is formed for the adjustment of the light transmittance. Further, in a recordable optical disc, an encryption key or copy control information (CCI) for encrypting or decrypting specific record information for copyright protection forms an emboss pit in an opposite area. As recorded, more efficient use of the recording area becomes possible.

In another aspect of the information recording medium of the present invention, in the opposing area, control information for controlling at least one of a recording operation and a reproduction operation of the recording information is recorded by forming the emboss pit.

According to this aspect, an emboss pit is formed for the adjustment of the light transmittance. Further, in the recording type optical disc, the control information for controlling at least one of the recording operation and the reproducing operation of the recording information is recorded by forming an emboss pit in the opposite area, whereby a more efficient recording area can be used.

In another aspect of the information recording medium of the present invention, at least one of the layers of the first recording layer and the second recording layer further has a management information recording area for recording management information, and in the management information recording area, As management information, identification information for identifying whether or not the emboss pit is formed in the opposing area is recorded.

According to this aspect, for example, identification information such as a flag is read by an information recording apparatus described later by, for example, a seek operation, so that it is possible to realize OPC processing appropriate for the information recording medium more quickly and accurately. It becomes possible.

In another aspect of the information recording medium of the present invention, in the other layer and the first recording layer, in a region different from the opposing area, a first calibration in which the power calibration is performed on the other layer and the first recording layer is performed. Each has a predetermined area.

According to this aspect, in a predetermined region provided in each layer of the second recording layer, power calibration is performed for each layer of the second recording layer via the emboss pit. On the other hand, in another layer of the second recording layer and the first predetermined region provided in the first recording layer, power calibration is performed for the other layer and the first recording layer of the second recording layer.

More specifically, the opposing area | region and the 1st predetermined area | region are comprised so that it may shift mutually in the radial direction and not overlap, for example. Therefore, the laser light when the test writing is performed in the predetermined area passes through the first predetermined area, for example, because it passes through the other area of the second recording layer and the opposite area or the unrecorded area provided in the first recording layer. I never do that. Therefore, the influence of the state in the first predetermined area, i.e., the test completion information or the unrecorded state is not affected by the test write information, so that the test writing in the predetermined area of each layer of the second recording layer is inaccurate. It is possible to prevent the situation to be done in advance.

If the opposing regions and the first predetermined region overlap each other and do not differ, for example, in the opposing region, optical characteristics such as light transmittance change due to the influence of the first predetermined region. Therefore, the test writing in the predetermined area performed through this area becomes inaccurate as much or less as possible.

In another aspect of the information recording medium of the present invention, each layer of the second recording layer is different from the predetermined area and does not face the opposite area, and the power to each layer of the second recording layer is different. Each has a second predetermined area where calibration is performed.

According to this aspect, each layer of the second recording layer is further configured to perform power calibration in accordance with the recording laser light transmitted through the other layer of the second recording layer and the unrecorded portion of the first recording layer. It has a predetermined area. Therefore, detection of the value of the optimum recording power corresponding to the recording state of the other layer of the second recording layer and the first recording layer can be realized.

In another aspect of the information recording medium of the present invention, at least one of the layers of the first recording layer and the second recording layer further has a management area for recording the detected optimal recording power value.

According to this aspect, each time a recording operation by an information recording apparatus to be described later is performed, or simultaneously or successively for each layer of the first recording layer and the second recording layer, OPC processing is performed. The value of the optimum recording power for each recording layer detected by this OPC process is recorded in the management area. By reading the value of the optimum recording power recorded in this management area, it becomes possible to realize a more accurate and faster recording operation.

Instead of recording the value of the optimum recording power in the management area of the information recording medium, it may be stored by a storage device such as a memory, for example, in the information recording device described later.

(Information recording device)

Hereinafter, the information recording apparatus of the present invention will be described.

The above object of the present invention is achieved by an information recording apparatus for recording the record information on the information recording medium according to claim 1, wherein the information recording apparatus is configured to focus the recording laser light on the first recording layer. Writing the test write information which is at least another part of the recording information into the first recording layer by irradiating, and irradiating the recording laser light onto each layer of the second recording layers to irradiate each layer of the second recording layers. A writing device for recording the test write information; And (I) test writing the test write information for power calibration of the recording laser light in relation to each layer of the second recording layers in the predetermined area through the opposing area, and (II) A test write control device for controlling the writing device to test write the test write information for power calibration of the recording laser light in relation to the other layers and the first recording layer in a first predetermined area provided in a different area; It includes.

According to the information recording apparatus of the present invention, under the control of a test writing control device including, for example, a CPU (Central Processing Unit) or the like, at least two recording layers of the information recording medium according to the present invention described above are provided. OPC processing can be performed efficiently by, for example, a writing device including an optical pickup and the like.

That is, for example, when an information recording medium such as an optical disc is manufactured, emboss pit is formed in the other layer of the second recording layer and the opposing area provided in the first recording layer, thereby providing light to a predetermined area in the opposing area. It is possible to make the transmittance approximately or completely equal to the light transmittance of the opposing area in the recording completion state. Therefore, under the control of the test write control device, before the OPC process is performed on each layer of the second recording layer by the writing device, another layer and the first recording layer of the second recording layer are to be in a recording completion state. The recording operation can be omitted, as appropriate. Therefore, according to the information recording apparatus of the present invention, it becomes possible to detect the value of the optimum recording power for each layer of the second recording layer more quickly and accurately.

Also in the information recording apparatus of the present invention, it is possible to appropriately adopt the same viewpoint as the various aspects of the above-described information recording medium of the present invention.

(Information recording method)

Hereinafter, the information recording method of the present invention will be described.

The above object of the present invention includes an writing device for writing test writing information which is at least another part of the recording information, for recording the recording information on the information recording medium according to claim 1; And the information recording method comprises: (I) testing the test write information for power calibration of the recording laser light in relation to each layer of the second recording layers in the predetermined area through the opposing area; And (II) test write the test write information for power calibration of the recording laser light in relation to the other layers and the first recording layer in a first predetermined area provided in an area different from the opposing area. And a test write control process for controlling the write device.

According to the information recording method of the present invention, as in the case of the information recording apparatus of the present invention described above, under the control of the test write control process, before the OPC process is performed for each layer of the second recording layer, the second recording layer It is possible to omit the recording operation for bringing the other layers and the first recording layer into the recording completion state as appropriate. Therefore, according to the information recording method of the present invention, it becomes possible to detect the value of the optimum recording power for each layer of the second recording layer more quickly and accurately.

Also in the information recording method of the present invention, it is possible to appropriately adopt the same viewpoints as the various aspects of the above-described information recording apparatus of the present invention.

These and other advantages of the present invention will become more apparent from the following examples.

As described above, according to the information recording medium of the present invention, the first recording layer provided with the opposing area formed by the emboss pit which can adjust the light transmittance and the other layer of the second recording layer, and the second recording provided with the predetermined area Each layer of layers is provided. Therefore, it becomes possible to detect the value of the optimum recording power for each layer of the second recording layer more quickly and accurately. In addition, according to the information recording apparatus and method of the present invention, it includes a test writing device, a test writing control device and a process, respectively, so that the value of the optimum recording power for each layer of the second recording layer can be detected more quickly and accurately. It becomes possible.

Fig. 1 is a schematic plan view (Fig. 1A) showing the basic structure of an optical disc having a plurality of recording areas according to the first embodiment of the information recording medium of the present invention, and a schematic sectional view of the optical disc and its radial direction corresponding thereto. Is a schematic conceptual diagram of the structure of a recording area in Fig. 1B.

2 is a partially enlarged perspective view of the recording surface of the optical disc according to the first embodiment.

3 is a schematic cross-sectional view showing an enlarged physical structure of the OPC area used in the OPC processing of the optical disc according to the first embodiment.

4 is a schematic cross-sectional view showing an enlarged physical structure of an OPC area used in 0PC processing of an optical disk according to a comparative example.

Fig. 5 is a schematic cross-sectional view that enlarges the physical structure of the OPC area used in 0PC processing of the optical disc according to the second embodiment.

6 is a schematic cross-sectional view enlarging the physical structure of the 0PC area used in the OPC processing of the optical disk according to the third embodiment.

7 is a block diagram conceptually showing the basic configuration of an information recording / reproducing apparatus according to the embodiment of the information recording apparatus of the present invention.

Fig. 8 is a flowchart showing the recording operation and the OPC processing of the optical disc of the information recording / reproducing apparatus in the embodiment of the information recording apparatus of the present invention.

* Explanation of the sign

Center hole, 10 tracks, 11 sectors, 100 optical discs, 101 lead-in areas, 102 data areas, 103 lead-out areas, 104 Intermediate region, 106 transparent substrate, first recording layer, transflective film, 109 wobble, 205 intermediate layer, 207 second recording layer Reflective film, 300 Information recording and reproducing apparatus, 301 Spindle motor, Optical pickup, 311 Head amplifier, 312 RF detector 315 Servo circuit, 320 LD driver, 325 wobble detector, 326 LPP data detector, 330 envelope detector, 340 OPC pattern generator, 345 timing generator, 350 data collector, 360 buffer, 370 DVD modulator, 380 data ECC generator, 385 buffer, 390 interface, 400 CPU, GT groove track, LT Land Track, LB Laser Light, LP Land Pre-Pit, TA (TA0-1 and TA0-2) Transmission Area, PCA0 (PCA1, PCA1-1 and PC) A1-2) ... OPC area

Best Mode for Carrying Out the Invention

BEST MODE FOR CARRYING OUT THE INVENTION In the best mode for carrying out the present invention, each embodiment will be described with reference to the drawings in order.

(First embodiment of information recording medium)

1 to 4, an optical disc according to a first embodiment of an information recording medium of the present invention will be described in detail with reference to the drawings. 1 and 2, the laser light is irradiated from the top to the bottom. Therefore, the LO layer (first recording layer) is located above. On the other hand, in FIGS. 3-6, the laser beam is irradiated from the lower side to the upper side. Therefore, the L0 layer (first recording layer) is located below.

First, with reference to FIG. 1, the basic structure of the optical disc according to the first embodiment of the information recording medium of the present invention will be described. 1A is a schematic plan view showing the basic structure of an optical disc having a plurality of recording areas according to the first embodiment of the information recording medium of the present invention, and FIG. 1B is a schematic sectional view of the optical disc and its radiation corresponding thereto. It is a schematic conceptual diagram of the structure of the recording area in the direction.

As shown in Figs. 1A and 1B, the optical disc 100 has, for example, a recording surface on a disc body having a diameter of about 12 cm, similarly to a DVD. On the recording surface, the optical disc 100 includes a lead-in area 101, a data area 102 and a lead-out area 103 or an intermediate area 104 in the center of the center hole 1 according to the present embodiment. . In particular, for example, in the lead-in area 101, an OPC area PCA0 or PCA1 that performs OPC processing is formed. For example, a recording layer and the like are laminated on the transparent substrate 106 of the optical disc 100. In each recording area of the recording layer, for example, spirals or concentric circles are formed around the center hole 1, and tracks 10 such as groove tracks and land tracks are alternatively formed. have. Moreover, on this track 10, data is divided and recorded in units of ECC blocks 11. The ECC block 11 is a data management unit by a pre-format address in which record information can be error corrected.

Incidentally, the present invention is not particularly limited to the optical disc having these three areas. For example, even if the lead-in area 101, the lead-out area 103 or the intermediate area 104 does not exist, the data structure and the like described below can be constructed. As described later, the lead-in area 101, the lead-out area 103 or the intermediate area 104 may be further subdivided.

In particular, as shown in FIG. 1B, the optical disc 100 according to the present embodiment includes, for example, L0 constituting an example of the first and second recording layers according to the present invention described later on the transparent substrate 106. The layer and the L1 layer are laminated | stacked. In recording and reproducing such a two-layer type optical disc 100, recording and reproducing in the L0 layer is performed according to which recording layer the condensing position of the laser beam LB irradiated from top to bottom in Fig. 1B is set. Alternatively, recording and reproduction in the L1 layer is performed. Incidentally, the optical disc 100 according to the present embodiment is not limited to one side of two layers, that is, dual layer single side, but may be two layers of both sides, that is, dual layer double side. As described above, the optical disk having three or more layers may be used, without being limited to an optical disk having two recording layers.

The recording / reproducing process in the two-layer type optical disc may be, for example, an opposite method in which the direction of the track path is reversed between the two recording layers, for example, the direction of the track path between the two recording layers is different. The same parallel method may be used.

Next, with reference to FIG. 2, the outline of the physical configuration of the optical disc according to the first embodiment of the information recording medium of the present invention will be described. More specifically, in the optical disc 100 according to the first embodiment, the plurality of data zones 102 and the like are configured as, for example, a two-layer type optical disc formed in a laminated structure. 2 is a partially enlarged perspective view of the recording surface of the optical disc according to the first embodiment of the information recording medium of the present invention.

As shown in Fig. 2, in the first embodiment, the optical disc 100 is in contact with the disc-shaped transparent substrate 106 and is formed by a phase change type or heating constituting an information recording surface. A first recording layer 107 (i.e., an LO layer) of an irreversible change recording type is stacked, and a semi-transmissive reflective film 108 is stacked below it. The groove track GT and the land track LT are alternatively formed on the information recording surface formed of the surface of the first recording layer 107. 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 106. For example, at the time of recording, irradiating the laser beam LB with the recording laser power causes irreversible change recording by writing or heating due to phase change to the first recording layer 107 in accordance with the recording data. On the other hand, at the time of reproduction, the laser beam LB is irradiated with the reproduction laser power weaker than the recording laser power, thereby reading the recording data written in the first recording layer 107.

In the first embodiment, the groove track GT is rocked at a constant amplitude and spatial frequency. In other words, the groove track GT is wobbled and the period of the wobble 109 is set to a predetermined value. On the land track LT, an address pit called land pre-pit LP indicating pre-format address information is formed. These two addressings (ie, the wobble 109 and the land pre-pit LP) can obtain information necessary for data rotation control such as disc rotation control during recording, generation of a recording clock, and recording address. The wobble 109 of the groove track GT may be modulated by a predetermined modulation method such as frequency modulation or phase modulation, so as to record the pre-format address in advance.

In the first embodiment, in particular, a second recording layer 207 (that is, an L1 layer) is formed below and in contact with the transflective reflective film 108, and a reflective film 208 is formed below it. The second recording layer 207 is irradiated with the laser beam LB through the transparent substrate 106, the first recording layer 107, and the semi-transmissive reflective film 108, so that the second recording layer 207 is substantially the same as the first recording layer 107. It is configured to enable recording and reproduction of an irreversible change recording type by a change type or by heating. The second recording layer 207 and the reflective film 208 may be laminated, that is, formed into a film on the transparent substrate 106 on which the first recording layer 107 and the transflective film 108 and the like are formed. Alternatively, after lamination, i.e., film formation, is performed on the distinguishing substrate, it may be bonded to the transparent substrate 106. Between the transflective film 108 and the second recording layer 207, a transparent intermediate layer 205 made of a transparent adhesive or the like is appropriately provided according to the manufacturing method.

When recording and reproducing such a two-layer type optical disc 100, recording and reproducing in the first recording layer 107 is performed or made depending on the condensing position of the laser beam LB, that is, which recording layer is focused. The recording and reproducing in the two recording layers 207 is performed.

3 and 4, the OPC area used in the OPC process will be described in more detail with respect to the optical disc 100 according to the first embodiment of the information recording medium of the present invention. 3 is an enlarged schematic sectional view of the physical structure of the OPC area used in the OPC processing of the optical disc according to the first embodiment of the information recording medium of the present invention. 4 is a schematic cross-sectional view showing an enlarged physical structure of an OPC area used in an OPC process of an optical disc according to a comparative example.

As shown in Fig. 3, the optical disc 100 has two recording layers, that is, an LO layer (i.e., a recording layer corresponding to the first recording layer 107 in Figs. 1 and 2) and an L1 layer. (I.e., a recording layer corresponding to the second recording layer 207 in Figs. 1 and 2). For convenience of explanation, the recording laser light LB is irradiated from the lower side to the upper side in the reverse direction of FIGS. 1 and 2.

In the L0 layer, for example, a transmissive area TA formed of emboss pits constituting an example of the "facing area" according to the present invention and TA0-2 in an unrecorded state are formed in the lead-in area.

On the other hand, in the L1 layer, for example, the OPC region PCA1 is formed in the lead-in region. And OPC area PCA1 is further provided with OPC area PCA1-1 and PCA1-2 which comprise an example of the "predetermined area" which concerns on this invention.

In detail, the OPC area PCA1 is an area used for the detection of the optimum recording power (that is, the calibration of the recording laser power) and the so-called OPC processing. In particular, the OPC area PCA1 is used for the detection of the optimal recording laser power of the L1 layer. More specifically, after completion of the test writing of the OPC pattern, the test written OPC pattern is reproduced, sampling of the reproduced OPC pattern is performed in sequence, and the optimum recording power is detected. In addition, the value of the optimum recording power obtained by the OPC process may be stored in, for example, a storage device such as a memory described later provided on the information recording device side, or may be recorded in a management information recording area or the like on the information recording medium. . Alternatively, 0PC processing may be performed each time a write operation is performed.

The laser beam LB for the OPC process is irradiated upward from the bottom in FIG. 3 by the optical pickup of the information recording / reproducing apparatus described later with respect to the L0 layer and the L1 layer, and the focal length and the like are controlled. At the same time, the moving distance and direction in the radial direction of the optical disc 100 are controlled.

In particular, in the optical disc 100 according to the first embodiment, for example, an emboss pit is formed in the transmission area TA provided in the L0 layer at the time of manufacture of the optical disc. Therefore, the light transmittance of the L1 layer in the transmission region TA to the OPC region PCA1-1 is approximately or completely equal to the light transmittance of the transmission region TA0-1 in the recording completed state according to the comparative example described in FIG. 4 described later. It is possible to do the same. Or (i) (ii) (ii-1) embossed as compared to the light transmittance when (i-1) emboss pits are not formed and (i-2) the L0 layer is assumed to be in an unrecorded state. It is possible to approximate the light transmittance in the case where no pits are formed (ii-2) and the L0 layer is assumed to be in the recording completion state.

Therefore, before the OPC process is performed on the L1 layer, the information recording apparatus can omit the recording operation for bringing the L0 layer into the recording completed state. From the above, it becomes possible to detect the value of the optimum recording power for the L1 layer more quickly and accurately.

On the other hand, the value of the optimum recording power for the L1 layer corresponding to the case where the L0 layer is in the unrecorded state is detected as the laser beam LB for recording passes through the transmission area TA0-2 in which the L0 layer is in the unrecorded state.

In addition, the emboss pit is formed for the adjustment of the light transmittance. For example, in a recordable optical disc, the use of a more efficient recording area in accordance with recording of an encryption key or CCI (Copy Control Information) for encrypting or decrypting specific recording information for copyright protection purposes is recorded. This becomes possible.

Next, with reference to Fig. 4 showing a comparative example, the effect of the optical disc according to the first embodiment of the information recording medium of the present invention will be examined.

As shown in Fig. 4, in the comparative example, in the lead-in area, for example, in the lead-in area, the transmission area TA0-1 in the completed recording state and the transmission area TA0-2 in the unrecorded state are formed.

On the other hand, in the L1 layer, for example, in the lead-in area, the OPC area PCA1 is formed in the same manner as in the first embodiment described above.

In this way, when no emboss pit is formed in the transmissive area TA0-1 of the L0 layer opposite to the OPC area PCA1-1 of the L1 layer, the optimum recording power in the OPC area PCA1-1 of the L1 layer is appropriately detected. In order to do this, a process of setting the transmission area TA0-1 of the L0 layer through which the laser beam transmits to the recording completion state is required by the information recording apparatus described later.

In contrast, according to the optical disk according to the first embodiment of the information recording medium of the present invention, as described above, for example, since emboss pits are formed in the transmission region provided in the L0 layer at the time of manufacturing the optical disk, L0 Since it is possible to omit the recording operation for bringing the layer to the completed recording state, it becomes possible to detect the value of the optimum recording power for the L1 layer more quickly and accurately.

(Second embodiment of the information recording medium)

Next, with reference to FIG. 5, the OPC area used in the OPC process for the optical disc according to the second embodiment of the information recording medium of the present invention will be described in more detail. 5 is a schematic sectional view in which the physical structure of the OPC area used in the OPC processing of the optical disc according to the second embodiment of the information recording medium of the present invention is enlarged.

The basic structure and the OPC process in the second embodiment of the information recording medium are substantially the same as those in the first embodiment described with reference to Figs.

In the second embodiment of the information recording medium, in particular, the first embodiment is further developed, and the transmission in which the emboss pit in the L0 layer facing the OPC area PCA1-1 where the OPC processing in the L1 layer is performed is formed. Since it is smaller than the area TA, it becomes possible to secure the margin for divergence or the like due to the influence of eccentricity between the layers in the two-layer type optical disc. Therefore, it is possible to more appropriately detect the value of the optimum recording power for the L1 layer.

(Third Embodiment of Information Recording Medium)

Next, with reference to FIG. 6, the OPC area used in the OPC processing of the optical disc according to the third embodiment of the information recording medium of the present invention will be described in more detail. 6 is a schematic sectional view in which the physical structure of the OPC area used in the OPC processing of the optical disc according to the third embodiment of the information recording medium of the present invention is enlarged.

The basic structure and the OPC processing in the third embodiment of the information recording medium are substantially the same as those in the first embodiment described with reference to Figs.

In the third embodiment of the information recording medium, in particular, the first embodiment is further developed, and the OPC areas PCA1-1 and PCA1-2 provided on the L1 layer and the OPC areas PCA0 provided on the L0 layer are shifted with each other in the radial direction. It is configured not to overlap. Therefore, the laser light LB at the time of test writing in the OPC areas PCA1-1 and PCA1-2 is, for example, transmitted through the transmission area TA provided in the L0 layer or the transmission area TA0-2 in the unrecorded state. Do not pass through the OPC area PCA0.

Therefore, the test write in the OPC areas PCA1-1 and PCA1-2 becomes inaccurate since the effect due to the state in the OPC areas PCA0, i.e., the test write information is not influenced by the write completion state or the unrecorded state. It is possible to prevent the situation in advance. If it is not shifted in the radial direction in this manner, in the OPC area PCA0, optical characteristics such as light transmittance change depending on the difference between the recorded or unrecorded state. Therefore, the test writing in the predetermined area made through this becomes inaccurate as much or less as possible.

(Example of information recording apparatus)

Next, with reference to FIG. 7 and FIG. 8, the structure and operation | movement of the Example of the information recording apparatus of this invention are demonstrated in detail. In particular, this embodiment is an example in which the information recording apparatus according to the present invention is applied to an information recording / reproducing apparatus for an optical disc.

(Information recording / playback device)

Next, with reference to FIG. 7, the basic configuration of the information recording and reproducing apparatus according to the embodiment of the information recording apparatus of the present invention will be described. 7 is a block diagram conceptually showing the basic configuration of the information recording / reproducing apparatus according to the embodiment of the information recording apparatus of the present invention.

As shown in FIG. 7, the information recording / reproducing apparatus 300 according to the present embodiment includes a spindle motor 300, an optical pickup 310, a head amplifier 311, an RF detector 312, and a servo circuit 315. LD driver 320, wobble detector 325, LPP data detector 326, envelope detector 330, OPC pattern generator 340, timing generator 345, data collector 350, buffer 360 And a DVD modulator 370, a data ECC generator 380, a buffer 385, an interface 390, and a central processing unit (CPU) 400.

The spindle motor 301 is configured to rotate the optical disc 100 at a predetermined speed while receiving a spindle servo from the servo circuit 315 or the like.

The optical pickup 310 performs recording or reproduction on the optical disc 100 and is composed of a semiconductor laser device, various lenses, actuators, and the like. More specifically, the optical pickup 310 irradiates the optical disk 100 with laser light, which is irradiated with the first power as the read light during reproduction, and modulated with the second power as the write light during recording. do. The optical pickup 310 is configured to be movable in the radial direction or the like of the optical disk 100 by an actuator (not shown), a slider, or the like driven by the servo circuit 315.

The head amplifier 311 amplifies the output signal of the optical pickup 310 (that is, the reflected light of the laser beam LB) and outputs the amplified signal. Specifically, an RF signal that is a read signal is output to the RF detector 312 and the envelope detector 330, and a push-pull signal is output to the wobble detector 325 or the LPP data detector 326.

The RF detector 312 is configured to detect the RF signal, perform demodulation, and the like, so that playback data can be output to the outside via the buffer 385 and the interface 390. In a external output device (for example, a display device such as a liquid crystal display or a plasma display, a speaker, or the like) connected to the interface 390, predetermined content is reproduced and output.

The servo circuit 315 moves the objective lens of the optical pickup 310 in accordance with a tracking error signal and a focus error signal obtained by processing the light reception result of the optical pickup 310, thereby providing various servos such as tracking control and focus control. Run the process. Moreover, it is comprised so that the spindle motor 301 may servo-control based on the wobble signal obtained from the wobble of the wobbled groove track in the optical disc 100. As shown in FIG.

During the OPC process described later, the LD driver 320 drives the semiconductor laser provided in the optical pickup 310 so that the optimum recording power is determined by the recording and reproducing process of the OPC pattern described later. Thereafter, the LD driver 320 is configured to drive the semiconductor laser of the optical pickup 310 with the optimum recording power determined by the OPC process at the time of data writing. In this data recording, the optimum recording power is modulated in accordance with the recording data.

One specific example of the " write device " according to the present invention is included, including the above-mentioned spindle motor 301, optical pickup 310, servo circuit 315, LD driver 320 and the like.

The wobble detector 325 detects a push-pull signal indicative of the wobble signal in accordance with an output signal corresponding to the amount of light received from the head amplifier 311, which is a detector for receiving the reflected light beam provided in the optical pickup 310. 345).

The LPP data detector 326 detects a push-pull signal indicative of the LPP signal in accordance with an output signal corresponding to the amount of light received from the detector head amplifier 311 that receives the reflected light beam installed in the optical pickup 310, and is described later, for example. The preformat address information can be detected. The preformat address information is configured to be output to the timing generator 345.

The envelope detector 330, under the control of the CPU 400, at the time of reproduction of the OPC pattern in the OPC process, determines the peak of the envelope detection of the RF signal, which is an output signal from the head amplifier 311, to determine the optimum recording power. And detect a peak value and a bottom value. The envelope detector 330 may be configured to include, for example, an analog / digital (A / D) converter.

The OPC pattern generator 340 is configured to output a signal indicating the OPC pattern to the LD driver 320 in accordance with the timing signal from the timing generator 345 at the time of recording the OPC pattern in the OPC processing before the write operation. have.

The timing generator 345 manages the pre-format address information (for example, ADIP word) in accordance with the pre-format address information input from the LPP data detector 326 at the time of recording the OPC pattern in the OPC process. Detects absolute position information based on units. At the same time, according to the period of the push-pull signal representing the wobble signal, the slot unit (for example, the slot unit corresponding to the natural number of times of one cycle of the wobble signal) is smaller than the management unit of the pre-format address information. Relative position information is detected. Therefore, the timing generator 345 can specify the recording start position regardless of whether or not the recording start position in the OPC process is started from a management unit of pre-format address information, that is, from the boundary of each ADIP word. Do. Thereafter, according to the period of the push-pull signal representing the wobble signal output from the wobble detector 325, a timing signal for writing the OPC pattern is generated and output. On the other hand, the timing generator 345 can specify the reproduction start position at the time of reproducing the OPC pattern in the OPC process as in the case of recording. Thereafter, according to the period of the push-pull signal representing the wobble signal output from the wobble detector 325, a timing signal for sampling the reproduced OPC pattern is generated and output.

The data collector 350 is primarily a memory. For example, it consists of external RAM. The envelope detected by the envelope detector 330 is stored in the data collector 350, and accordingly, detection of the optimal recording power in the CPU 400, that is, OPC processing is executed.

The buffer 360 is configured to store recording data modulated by the DVD modulator 370 and output the LD driver 320 to the LD driver 320.

The DVD modulator 370 is configured to perform DVD modulation on the record data and to output the buffer to the buffer 360. As the DVD modulation, for example, 8/16 modulation may be performed.

The data ECC generator 380 adds an error correction code to the recording data input from the interface 390. Specifically, an ECC code is added for each predetermined block unit (for example, ECC cluster unit) and output to the DVD modulator 370.

The buffer 385 stores the reproduction data output from the RF detector 312 and outputs it to an external output device through the interface 390.

The interface 390 receives an input such as recording data from an external input device and outputs it to the data ECC generator 380. For example, the playback data output from the RF detector 312 may be output to an external output device such as a speaker or a display.

The CPU 400 instructs each device, for example, the LD driver 320, the servo circuit 315, or the like, in order to detect the optimum recording power, i.e., by outputting a system command, the information recording / reproducing apparatus 300 ) The overall control is performed. Typically, software for operating the CPU 400 is stored in an internal or external memory.

And one of the " test write control device " according to the present invention, including the CPU 400, the envelope detector 330, the OPC pattern generator 340, the timing generator 345, the LD driver 320, and the like described above. The specific example is comprised.

In addition, the information recording / reproducing apparatus 300 shown in FIG. 7 generally includes an optical pickup 310, an LD driver 320, a buffer 360, a DVD modulator 370, a data ECC generator 380, and other items. The component functions as an information recording apparatus capable of recording data. It goes without saying that the optical pickup 310, the head amplifier 311, the RF detector 312, and other components also function as information reproducing apparatuses capable of reproducing data.

(Flow of recording operation by the information recording / reproducing apparatus)

Next, with reference to FIG. 8, the flow of the recording operation and the OPC processing of the optical disc in the embodiment of the information recording / reproducing apparatus according to the present embodiment will be described in detail. 8 is a flowchart showing the recording operation and the OPC process of the optical disc of the information recording / reproducing apparatus in the embodiment of the information recording apparatus of the present invention.

In FIG. 8, when the optical disc 100 is loaded first, under the control of the CPU 354, the seek operation is performed by the optical pickup 352, and various management information necessary for the recording process on the optical disc 100 is obtained. According to this management information, whether the recording operation of the data of the optical disc 100 is started via the data input / output control device 306 under the control of the CPU 354, for example, according to an instruction from an external input device or the like. It is determined whether or not it is (step S101). Here, when the data recording operation of the optical disc 100 is started (step S101: Yes), it is further determined whether the recording layers to be recorded are the LO layer and the L1 layer (step S102). Here, when the recording layer to be recorded is the L0 layer and the L1 layer (step S102: Yes), address information in the OPC area where the OPC processing of the L0 layer and the L1 layer is performed is specified (step S103).

Next, in the transmission area TA or TA0-2 of the L0 layer facing the OPC area PCA1 of the L1 layer, it is determined whether or not emboss pits are formed (step S104). Here, when the emboss pit is formed in the transmissive area TA or TA0-2 of the L0 layer (step S104: Yes), the OPC process is performed on the OPC area PCA0 with respect to the L0 layer and the L1 layer. About OPC area PCA1-1, OPC process is performed by the laser beam LB which permeate | transmitted the transmission area TA (step S106). In the present embodiment, in particular, as described above, when OPC processing is performed on the OPC area PCA1-1 of the L1 layer by the information recording medium, it is possible to omit a previous recording operation to the transmissive area TA of the L0 layer. Therefore, it becomes possible to detect the value of the optimum recording power for the L1 layer more quickly and accurately.

On the other hand, when the emboss pit is not formed in the transmission area TA or TA0-2 of the L0 layer (step S104: No), the recording operation is performed in the transmission area TA0-2 of the L0 layer (step) S105), thereby completing the recording completion state and proceeding to step S106 described above.

Subsequently, data is recorded in the L0 layer and the L1 layer by the optimum recording power detected by the OPC process in step S106 (step S107).

On the other hand, as a result of the determination in step S102, when the recording layers to be recorded are not the LO layer and the L1 layer (step S102; No), it is then determined whether or not the recording layer to be recorded is only the L0 layer. (Step S108). Here, when the recording layer to be recorded is only the LO layer (step S108; Yes), address information in the OPC area where the OPC process of the L0 layer is performed is specified (step S109).

Next, the OPC process is performed on the OPC area PCA0 of the L0 layer (step S110). Subsequently, data is written into the L0 layer by the optimal recording power calculated in step S110 (step S111).

On the other hand, as a result of the determination in step S108, when the recording layer to be recorded is not only the L0 layer, that is, when the recording layer to be recorded is only the L1 layer (step S108: No), OPC processing of the L1 layer is performed. The address information in the OPC area is specified (step S112).

Next, it is determined whether or not emboss pits are formed in the transmissive area of the L0 layer opposite to the OPC area of the L1 layer (step S113). Here, when emboss pit is formed in the permeable area of LO layer (step S113: Yes), OPC process is performed with respect to L1 layer (step S115). In the present embodiment, in particular, as described above, when OPC processing is performed on the L1 layer by the information recording medium, it is possible to omit the previous recording operation on the L0 layer. Therefore, it becomes possible to detect the value of the optimum recording power for the L1 layer more quickly and accurately.

On the other hand, when no emboss pit is formed in the transmissive region of the L0 layer (step S113: No), the recording operation is performed in the transmissive region of the L0 layer (step S114), and then the recording completion state is It forms, and it progresses to step S115 mentioned above.

Subsequently, data is recorded on the L1 layer by the optimal recording laser power detected in step S115 (step S116).

Subsequently, it is determined whether or not the data recording operation is finished (step S117). Here, when the data recording operation is terminated (step S117: Yes), the series of recording operations by the information recording apparatus is completed.

On the other hand, when the data recording operation is not finished (step S117: No), as described above, it is determined whether or not the recording layers to be recorded are the L0 layer and the L1 layer (step S102).

On the other hand, when the recording operation of the data of the optical disc 100 is not started as a result of the determination in step S101 (step S101: No), for example, an instruction such as a write operation start command is awaited.

In this embodiment, as one specific example of the information recording medium, for example, a write-once type or a rewritable type optical disc such as a two-layer DVD-R or DVD-R / W, And an information recording / reproducing apparatus for the optical disc, as a specific example of the information recording apparatus, the present invention is, for example, an optical disc of various layer types such as a three-layer type or a four-layer type, and information recording / It is also applicable to a reproduction device. The present invention is also applicable to a large capacity recording medium such as a Blu-ray disc and an information recording / reproducing apparatus of the recording medium.

The present invention is not limited to the above-described embodiments, and may be appropriately modified without departing from the spirit or spirit of the invention, which can be read from the claims and the entirety of the specification, and an information recording medium and information following such a change. The recording apparatus and method are also included in the technical scope of the present invention.

The information recording medium, the information recording apparatus and the method according to the present invention can be used for, for example, a high density optical disc such as a DVD or a CD, and can also be used for an information recording apparatus such as a DVD recorder.

Claims (12)

In the information recording medium, A first recording layer for recording; And Second recording layer for recording Including, The first recording layer and the second recording layer are arranged in the order of the first recording layer and the second recording layer when viewed from the irradiation side of the laser light, The second recording layer has a predetermined area where power calibration is performed to detect an optimum recording power of the recording laser beam that has passed through the first recording layer, The first recording layer has an opposing area having embossed pits and opposing the predetermined area; And a light transmittance of the opposing area is equal to a light transmittance of the recorded area of the first recording layer. delete The method of claim 1, And the predetermined area is smaller than the opposing area. The method of claim 1, In the opposite area, the information recording medium in which encrypted information for encrypting or decrypting the record information is recorded by forming the emboss pit. The method of claim 1, In the opposing area, information recording medium in which control information for controlling at least one of a recording operation and a reproduction operation of the recording information is recorded by forming the emboss pit. The method of claim 1, At least one of the first recording layer and the second recording layer further has a management information recording area for recording management information, An information recording medium according to the management information recording area, in which identification information for identifying whether the emboss bit is formed in the opposing area or not is recorded as the management information. The method of claim 1, And the first recording layer has a first predetermined area in which the power calibration is performed on the first recording layer in an area different from the opposing area. The method of claim 1, And the second recording layer has a second predetermined area in which the power calibration is performed on the second recording layer in an area different from the predetermined area and not facing the opposite area. The method of claim 1, At least one of the first recording layer and the second recording layer further has a management area for recording the value of the detected optimum recording power. A first recording layer for recording; And a second recording layer for recording, wherein the first recording layer and the second recording layer are arranged in the order of the first recording layer and the second recording layer when viewed from the irradiation side of the laser beam, and the second recording layer. The layer has a predetermined area where a power calibration is performed to detect an optimum recording power of the recording laser beam that has passed through the first recording layer, and the first recording layer faces an area having emboss pits while facing the predetermined area. An information recording apparatus for recording record information on an information recording medium having a light transmittance of the opposite area equal to a light transmittance of a recorded area of the first recording layer, A writing device for writing test write information into the second recording layer based on the recording laser light; And A test write control device for controlling the writing device to test write the test write information for power calibration of the recording laser light for the second recording layer in the predetermined area through the opposing area Information recording device comprising a. A first recording layer for recording; And a second recording layer for recording, wherein the first recording layer and the second recording layer are arranged in the order of the first recording layer and the second recording layer when viewed from the irradiation side of the laser beam, and the second recording layer. The layer has a predetermined area where a power calibration is performed to detect an optimum recording power of the recording laser beam that has passed through the first recording layer, and the first recording layer faces an area having emboss pits while facing the predetermined area. And a writing device for writing test writing information to record the recording information on an information recording medium having a light transmittance of the opposite area equal to a light transmittance of the recorded area of the first recording layer. In the information recording method in And a test write control process of controlling the writing device to test write the test write information for power calibration of the recording laser light to the second recording layer in the predetermined area through the opposing area. . In the information recording medium, A first recording layer for recording first information which is at least part of the record information; And One or a plurality of second recording layers disposed on the first recording layer for recording second information which is at least another part of the recording information. Including, Each layer of the second recording layers has a predetermined area in which a power calibration for detecting an optimum recording power of a recording laser beam transmitted through the first recording layer and the other layers of the second recording layers is performed. The first recording layer, the other layers of the second recording layers, and the respective layers of the second recording layers are the first recording layer, the other layers of the second recording layer and the second recording when viewed from the irradiation side of the laser light. Arranged in the order of each of said layers, In the other region of the second recording layers and the opposing area facing the predetermined area in the first recording layer, by forming an emboss pit, the light transmittance of the opposing area is (i) (i-1) Compared to the light transmittance when the emboss pit is not formed and (i-2) the other layers and the first recording layer are assumed to be in an unrecorded state, (ii) (ii-1) the emboss bit Is not formed and (ii-2) is closer to the light transmittance when the other layers and the first recording layer are assumed to be in a recording completion state.

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