JP2004171740A - Optical information recording medium, method and apparatus for optical recording and reproducing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical information recording medium, and an apparatus and method for optical recording and reproducing by which a correct pulse condition can be obtained by learning operation and user data can be correctly recorded regardless of the recording condition of information in each recording layer. <P>SOLUTION: The optical information recording medium (1) includes first to N-th (N is an integer ≥2) recording layers (3 and 5) arranged in order from a side opposite to the incident side of laser beams. The laser beams incident from one surface are projected on one of the first to N-th recording layers for recording and reproducing information. At least one of the first to N-th recording layers is provided with correction information recording parts (101 and 104). In the correction information recording parts, correction information for correcting laser beam intensity based on the change of transmission between an unrecorded state and a recorded state in the second to N-th recording layers is recorded. <P>COPYRIGHT: (C)2004,JPO

Description

  The present invention relates to an optical information recording medium including a plurality of recording layers capable of recording and reproducing information by irradiation with laser light and the like, and an optical recording and reproducing method for recording and reproducing information on and from such an optical information recording medium. The present invention relates to a method and an optical recording / reproducing apparatus.

  There is an optical information recording medium as a large-capacity and high-density memory. Among them, as one of rewritable optical information recording media on which information can be rewritten, an optical information recording medium having a recording layer as a recording layer a thin film that reversibly changes between an amorphous state and a crystalline state on a substrate. There is. Such an optical information recording medium utilizes the phenomenon that the recording layer reversibly changes its phase between a crystalline phase and an amorphous phase due to thermal energy caused by laser light irradiation on the recording layer. Recording and erasing.

  As a phase change material for the recording layer, an alloy film containing at least one of Ge, Sb, Te, and In as a main component, for example, a Ge—Sb—Te alloy film or the like is known. Recording of information is performed by forming a recording mark by partially amorphizing the recording layer. Information is erased by crystallizing a recording mark (amorphous phase). Amorphization is performed by heating the recording layer above its melting point and then rapidly cooling it. On the other hand, crystallization is performed by heating the recording layer to a temperature higher than the crystallization temperature and lower than the melting point, and gradually cooling the recording layer.

  Generally, a spiral or concentric guide groove (groove) for tracking a laser beam during recording and reproduction is provided in advance on the substrate surface. The area between adjacent grooves is called a land. Often, only one of the groove and the land is used as an information track for recording information, and the other is a guard band for separating information tracks adjacent to each other. This method is also used for recordable CDs (CD-R) and minidiscs (MD).

  As a method of recording information on an optical information recording medium, marks having different lengths are formed by providing various spaces, and the length of the recording mark and the length of the space (that is, the front end and the rear end of the recording mark). There is a mark edge recording system in which an edge position carries information.

  In such a PWM (Pulse Width Modulation) recording method, when pulse conditions such as laser beam intensity and pulse generation timing are inappropriate during recording, heat generated at the front of the recording mark promotes temperature rise at the rear. The front end becomes thin and the rear end becomes thick and distorted mark shape, or the heat generated at the time of forming the recording mark affects the formation of the adjacent recording mark and the edge position of the mark fluctuates. There is a problem that the quality is reduced.

  Therefore, in order to solve such a problem, it is important to find an optimal pulse condition. The optimum pulse condition largely depends on the characteristics of the optical information recording medium and the optical recording / reproducing apparatus. Therefore, at the time of recording, when the optical information recording medium is mounted on the optical recording / reproducing apparatus and activated, a learning operation for finding an optimal pulse condition is required each time. The learning operation is to perform the test recording while changing the pulse conditions, measure the quality of the reproduction signal of the information recorded in the test recording, and compare the measurement result with the predetermined condition to obtain the optimum recording / reproduction. A condition is obtained.

  FIG. 8 shows an example of a conventional optical information recording medium. As shown in FIG. 8, a disc-shaped optical information recording medium 81 is provided at the center with a center hole 82 for mounting on an optical recording / reproducing apparatus. The optical information recording medium 81 is formed by providing a recording layer on a transparent substrate made of polycarbonate and having a thickness of 1.1 mm, and further providing a protective layer having a thickness of 0.1 mm. By irradiating laser light from the protective layer side and irradiating the recording layer with laser light transmitted through the protective layer, information is recorded and reproduced. A track 86 for tracking a laser beam during recording and reproduction is provided on the transparent substrate. The optical information recording medium 81 includes a read-only read-in area 83 in which identification information of the medium is recorded by emboss pits or the like, a test recording area 84 for performing a learning operation for finding an optimal pulse condition, and user data. It has an information recording area 85 for recording.

Recently, the amount of information to be handled has been increasing with the improvement of the processing capability of various information devices. Therefore, an optical information recording medium having a larger capacity and capable of high-speed recording and reproduction is demanded. As means for increasing the capacity, for example, a multilayer recording medium in which a plurality of recording layers are stacked and information can be recorded / reproduced from / to one of the recording layers from one side has been proposed. In such a multilayer recording medium, recording / reproducing characteristics such as optimum laser beam intensity at the time of recording differ for each recording layer. Therefore, the conventional optical information recording / reproducing apparatus performs a learning operation for each recording layer included in the optical information recording medium (for example, see Patent Document 1 below).
JP-A-11-3550

  In a multilayer recording medium, recording / reproducing to / from a recording layer other than the recording layer disposed closest to the laser beam incident side is performed by a laser beam transmitted through the recording layer disposed before the recording layer. Since the transmittance of the recording layer differs depending on whether it is in an amorphous state or a crystalline state, the transmittance of the laser beam in each recording layer differs depending on whether information is recorded.

  For the above reasons, the intensity of the laser beam reaching the target (recording / reproducing information) recording layer depends on the recording state of the other recording layer disposed before the recording layer. Therefore, when recording and reproduction are performed under the pulse conditions obtained by the learning operation according to the conventional method, there has been a problem that user data cannot be recorded and reproduced correctly.

  Also, in the learning operation, the intensity of the laser beam reaching the recording layer for the purpose of actually performing the learning operation at the time of test recording differs depending on the recording state of the preceding recording layer, so that a correct pulse condition cannot be obtained. There was a problem.

  The optical information recording medium of the present invention includes first to Nth recording layers (N is an integer of 2 or more) arranged in this order from the side opposite to the laser beam incident side, and is incident from one surface. An optical information recording medium on and from which information is recorded and reproduced by irradiating any one of the first to Nth recording layers with the laser light, wherein the first to Nth recording layers are provided. At least one of the recording layers is provided with a correction information recording unit, and the correction information recording unit has a transmittance of the transmittance between the unrecorded state and the recorded state in the second to Nth recording layers. It is characterized in that correction information for correcting the laser beam intensity based on the change is recorded.

  The first optical recording / reproducing method of the present invention includes first to Nth recording layers (N is an integer of 2 or more) arranged in order from the side opposite to the laser beam incident side, and the first method. A correction information recording unit is provided in at least one of the Nth to Nth recording layers, and the correction information recording unit is provided between the unrecorded state and the recorded state in the second to Nth recording layers. An optical recording / reproducing method for recording and reproducing information on and from an optical information recording medium on which correction information for correcting laser light intensity based on a change in transmittance of When recording and reproducing information on a recording layer (K is an arbitrary integer satisfying 1 ≦ K ≦ N−1), a pulse condition including the intensity of a laser beam is determined using the correction information. It is characterized by:

  According to the second optical recording / reproducing method of the present invention, optical information including first to Nth recording layers (N is an integer of 2 or more) arranged in order from the side opposite to the laser beam incident side. An optical recording / reproducing method for recording and reproducing information by irradiating a recording medium with a laser beam from one surface, wherein an order of recording user data on the first to Nth recording layers is determined. Recorded recording layer information that specifies a recording layer in which user data is already recorded is recorded in a predetermined location of the optical information recording medium, and the recorded layer information is recorded before newly recording user data. It is characterized in that the recording layer information is read out, and user data is recorded in a predetermined order on the recording layers subsequent to the recording layer that matches the recorded recording layer information.

  The optical recording / reproducing apparatus of the present invention includes first to Nth recording layers (N is an integer of 2 or more) arranged in order from the side opposite to the laser beam incident side, and the first to Nth layers. A correction information recording section is provided in at least one of the recording layers of the first and second recording layers. The correction information recording section has a transmittance between an unrecorded state and a recorded state in the second to Nth recording layers. An optical recording and reproducing apparatus for recording and reproducing information on and from an optical information recording medium on which correction information for correcting a laser beam intensity based on a change in the information is recorded. A correction information storage unit that stores the correction information recorded in the storage unit; a control unit that determines a pulse condition for recording user data using the correction information stored in the correction information storage unit; and the control unit. Using the pulse conditions determined in Is characterized in that it comprises a pulse condition setting unit that controls over light.

  According to the optical information recording medium, the optical recording / reproducing method, and the optical recording / reproducing apparatus of the present invention, the correct pulse condition can be obtained by the learning operation regardless of the information recording state in each recording layer, Data can be recorded correctly.

  According to the optical information recording medium of the present invention, by using the correction information, user data can be correctly recorded regardless of the recording state of each recording layer.

  In the optical information recording medium of the present invention, at least one of the first to Nth recording layers includes a read-only lead-in area, and the correction information recording unit is provided in the lead-in area. It may be.

  When the optical information recording medium of the present invention has a disk shape, in the optical information recording medium of the present invention, the first to Nth recording layers each include at least a test recording area for performing test recording and a user data area. And a test recording area of the K-th recording layer (K is an arbitrary integer satisfying 1 ≦ K ≦ N−1). It is preferable to be arranged at a radial position different from the test recording area and the information recording area of the N recording layers. This is because a correct pulse condition can be obtained by test recording regardless of the recording state of each recording layer. In this case, a guide groove for tracking laser light is provided in the first to Nth recording layers, and a test recording area of the Kth recording layer in the (K + 1) th to Nth recording layers is provided. A guide groove having substantially the same shape as the guide groove in the information recording area may be provided at the arranged radial position. During test recording, the effect of the laser beam diffracted by the guide groove is equivalent to the information recording area, so that the pulse conditions found in the test recording area and the optimum conditions in the information recording area must be more accurately matched. Because it can be.

  In the optical information recording medium of the present invention, the correction information may be a correction coefficient obtained from the transmittance T1 in the unrecorded state and the transmittance T2 in the recorded state in the second to Nth recording layers. Good. Further, the correction information is a correction coefficient, and the correction coefficient is arranged closer to the laser beam incident side than the Kth recording layer (K is an arbitrary integer satisfying 1 ≦ K ≦ N−1). When at least one of the (K + 1) th to (N) th recording layers is in an unrecorded state, the reproduction signal of the information recorded on the Kth recording layer using the correction laser light corrected by the correction coefficient. The quality may be set so as to satisfy a predetermined standard. Further, the correction information may be transmittance change information indicating whether the transmittance is reduced or increased by recording information for the second to Nth recording layers.

  In the optical information recording medium of the present invention, target recording layer information for specifying a recording layer on which user data is to be recorded using the laser light corrected by the correction information is the correction information together with the correction information. It may be recorded in the recording unit. Further, recording layer specifying information for specifying any of the recording layers disposed on the laser beam incident side of the target recording layer is recorded in the correction information recording section together with the correction information and the target recording layer information. You may.

  In the optical information recording medium of the present invention, the first to Nth recording layers include an information recording area for recording user data, and the information included in the first to Nth recording layers At least one of the recording areas may include a recorded recording layer information recording unit that records recorded recording layer information indicating a recording layer on which the information recording area has been recorded. Further, the recorded recording layer information may include recorded address information for specifying a position of a recorded area. According to this, it is also possible to change the laser beam intensity according to the recording state of each recording layer.

  According to the first optical recording / reproducing method of the present invention, user data can be correctly recorded on the optical information recording medium of the present invention regardless of the recording state of each recording layer.

  In the first optical recording / reproducing method of the present invention, the optical information recording medium has a disk shape, and the first to Nth recording layers have at least a test recording area for performing test recording; And an information recording area for recording user data. The test recording area of the Kth recording layer is located at a different radial position from the test recording area and the information recording area of the (K + 1) th to Nth recording layers. When information is recorded on the K-th recording layer, test recording is performed in a test recording area of the K-th recording layer, and laser light is emitted using the test recording result and the correction information. It is preferable to determine pulse conditions including intensity. This is because a correct pulse condition can be obtained by test recording regardless of the recording state of each recording layer.

  In the first optical recording / reproducing method according to the present invention, the correction information is a correction coefficient, and the correction coefficient is the (K + 1) -th to (N) -th to (N) th recording layers arranged on the laser beam incident side of the K-th recording layer. When at least one of the layers is in an unrecorded state, the quality of a reproduction signal of information recorded on the Kth recording layer using the correction laser light corrected by the correction coefficient satisfies a predetermined standard. When information is recorded on the K-th recording layer, a pulse condition including the intensity of the laser beam may be determined using the correction coefficient. The quality of the reproduced signal can be evaluated by measuring a jitter value of the reproduced signal. Further, the correction information is transmittance change information indicating whether the transmittance is reduced or increased by recording information for the second to Nth recording layers. When recording information, the intensity of the laser beam may be changed according to the transmittance change information.

  Further, in the first optical recording / reproducing method of the present invention, user data is recorded on the optical information recording medium in the correction information recording section using a laser beam corrected by the correction information. Target recording layer information for specifying a target recording layer, and recording layer specifying information for specifying any recording layer disposed on the laser beam incident side of the target recording layer are recorded together with the correction information. And a recording layer in which an information recording area has been recorded is provided in a recorded recording layer information recording section provided in at least one of the information recording areas included in the first to Nth recording layers. Is recorded, and the correction information includes a plurality of correction coefficients. When recording information on the K-th recording layer, the K-th recording layer Read target recording layer information that matches And selecting, from among the plurality of correction coefficients, a correction coefficient recorded together with the recording layer specifying information that matches the recorded recording layer information among the recording layer specifying information recorded together with the read target recording layer information. Alternatively, pulse conditions including the intensity of the laser beam may be determined using the selected correction coefficient. Specifically, for example, based on the recorded recording layer information, it is determined whether or not each of the recording layers disposed on the laser beam incident side of the target recording layer is recorded, and according to the recorded recording layer. To select the correction coefficient. Further, the recorded recording layer information includes recorded address information for specifying a position of a recorded area, and the recorded address information may be further used when selecting the correction coefficient. According to this, it is also possible to change the laser beam intensity according to the recording state of each recording layer.

  According to the second optical recording / reproducing method of the present invention, it is possible to easily record correct user data on a write-once optical information recording medium. In this case, the recorded recording layer information may include recorded address information for specifying the position of the recorded area.

  According to the optical recording / reproducing apparatus of the present invention, user data can be correctly recorded on the optical information recording medium of the present invention regardless of the recording state of each recording layer.

  In the optical recording / reproducing apparatus of the present invention, the optical information recording medium has a disk shape, and the first to Nth recording layers include at least a test recording area for performing test recording and user data. And a test recording area of the K-th recording layer (K is an arbitrary integer satisfying 1 ≦ K ≦ N−1). The test recording area of the recording layer and the information recording area are arranged at different radial positions, the optical recording and reproducing apparatus further includes a signal quality determination unit that determines the quality of the reproduction signal of the test recorded information, The control unit preferably determines a pulse condition for recording user data using the correction information and a result of the test recording. This is because a correct pulse condition can be obtained by test recording regardless of the recording state of each recording layer.

  In the optical recording / reproducing apparatus of the present invention, the optical information recording medium includes a recording layer serving as a target for recording user data in the correction information recording section using laser light corrected by the correction information. Target recording layer information to specify, and the recording layer specifying information to specify any recording layer disposed on the laser light incident side than the target recording layer is recorded together with the correction information, and In a recorded recording layer information recording section provided in at least one of the information recording areas included in the first to Nth recording layers, a recorded recording indicating a recording layer in which the information recording area has been recorded. Layer information is recorded, and the optical recording / reproducing apparatus further includes a recorded recording layer information storage unit that stores recorded recording layer information recorded on the optical information recording medium, Section is the supplement Information and using the recorded recording layer information, may determine the pulse condition for recording user data. For example, the correction information includes a plurality of correction coefficients, and the control unit transmits the information to a K-th recording layer (K is an arbitrary integer satisfying 1 ≦ K ≦ N−1). When performing recording, the target recording layer information that matches the K-th recording layer is read, and the recording layer that matches the recorded recording layer information among the recording layer specifying information recorded together with the read target recording layer information. A correction coefficient recorded together with the specific information may be selected from the plurality of correction coefficients, and a pulse condition for recording user data may be determined using the selected correction coefficient. Specifically, for example, the control unit determines, based on the recorded recording layer information, whether or not each recording layer disposed closer to the laser beam incident side than the target recording layer has been recorded. The correction coefficient is selected according to the recording layer.

  In the optical recording / reproducing apparatus of the present invention, the recorded recording layer information includes recorded address information for specifying a position of a recorded area, and the control unit is configured to select the correction coefficient. The recorded address information may be further used.

  In the optical recording / reproducing apparatus according to the present invention, the signal quality determining section may measure a jitter value of the reproduced signal to evaluate the quality of the reproduced signal.

  In the optical recording / reproducing apparatus of the present invention, the pulse condition includes a laser beam intensity, a pulse length, and a generation timing, and is set according to at least one of a mark length and a mark interval to be recorded. It may be.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
An embodiment of the optical information recording medium of the present invention will be described.

  FIG. 1 is a cross-sectional view illustrating a configuration of an optical information recording medium 1 according to the present embodiment. The optical information recording medium 1 has a disk shape, and has a first recording layer 5 having a thickness of about 200 nm and a transparent separation layer 4 having a thickness of about 0.03 mm on a substrate 6 made of polycarbonate having a thickness of about 1.1 mm. , A second recording layer 3 and a protective layer 2 having a thickness of about 100 nm are sequentially provided. The first recording layer 5 and the second recording layer 3 are provided with, for example, an information track (not shown) having a depth of about 20 nm and a width of about 0.2 μm for tracking a laser beam during recording and reproduction.

  In the optical information recording medium 1, a laser beam is applied from the surface on the protective layer 2 side.

  The second recording layer 3 is provided, for example, at a position with a radius of about 22 mm to 23 mm, and has a read-only lead-in area 101 in which information such as medium identification information is recorded by wobbling an information track, and a radius of about 24 mm to 25 mm. And a test recording area 102 for performing a learning operation for finding an optimal pulse condition, and an information recording area 103 provided at a radius of about 25 mm to 58 mm for recording user data. . Further, the first recording layer 5 includes, for example, a read-only lead-in area 104 provided at a position of a radius of about 22 mm to 23 mm where information such as medium identification information is recorded by wobbling an information track, and a radius of about 23 mm. And a test recording area 105 for performing a learning operation for finding an optimum pulse condition, and an information recording area 106 for recording user data, which is provided at a radius of about 24 to 58 mm. ing. As described above, the test recording area 105 of the first recording layer 5 and the test recording area 102 of the second recording layer 3 are provided at different radial positions (so as not to overlap).

  FIG. 2 shows a more detailed structure of the optical information recording medium 1. As shown in FIG. 2, the second recording layer 3 is, for example, a multilayer thin film of a protective film 201 made of a dielectric material, a phase change film 202 made of a Ge—Sb—Te thin film, and a protective film 203 made of a dielectric material. It is composed of In the present embodiment, the second recording layer 3 is formed of a material whose transmittance is reduced by partially changing the phase change film 202 from a crystalline state to an amorphous state by recording information. I do.

  The first recording layer 5 is, for example, a multilayer of a protective film 204 made of a dielectric material, a phase change film 205 made of a Ge—Sb—Te thin film, a protective film 206 made of a dielectric material, and a reflective film 207 made of a metal material. It is composed of a thin film.

  In the lead-in area 104 (see FIG. 1) of the first recording layer 5, correction information for correcting the laser beam intensity is recorded. Further, in the lead-in area 104, target recording layer information for specifying a recording layer on which user data is to be recorded using the laser beam corrected by the correction information is also recorded together with the correction information. The correction information is, for example, a correction coefficient α for correcting a decrease in laser light intensity based on a decrease in transmittance of the second recording layer 3 due to recording of information. The lead-in area 104 is provided with a correction information recording unit (not shown) for recording the correction information as described above. As an example of the correction coefficient α, for example, when the transmittance of the second recording layer 3 in the unrecorded state is T1 and the transmittance of the second recording layer 3 in the recorded state is T2, the following relational expression is used. The values given are listed.

α = T1 / T2
When information is recorded / reproduced on / from the optical information recording medium 1, the optical recording / reproducing apparatus first reads the correction coefficient α recorded in the lead-in area 104 of the first recording layer 5 at the time of startup. .

  Next, for each of the first recording layer 5 and the second recording layer 3, a learning operation for finding an optimum pulse condition is performed. Specifically, test recording is performed in the test recording areas 105 and 102 of the first recording layer 5 and the second recording layer 3 while changing pulse conditions such as laser light intensity, pulse length, and generation timing. From the result of measuring the quality of the signal reproduced from the recording mark recorded in the test recording, the optimum pulse condition is obtained.

  When recording user data in the information recording area 103 of the second recording layer 3, a laser beam having the pulse condition obtained in the test recording area 102 is used. When user data is recorded in the information recording area 106 of the first recording layer 5, laser light having an intensity obtained by correcting the optimum laser light intensity under the pulse condition obtained in the test recording area 105 with a correction coefficient α is used. . For example, when the optimum laser light intensity under the pulse condition obtained in the test recording area 105 is P1, the laser light intensity when recording user data in the information recording area 106 is P1 × α.

The correction coefficient α is not limited to a value given by α = T1 / T2. For example, when the second recording layer 3 is in an unrecorded state (a state in which the transmittance is high), information is recorded on the first recording layer 5 by using a correction laser beam having an intensity obtained by correcting the optimum laser beam intensity with the correction coefficient α. Is recorded, the correction coefficient α can be determined so that the quality of the reproduced signal of the recorded information falls within a range satisfying a predetermined standard. For example, if the relationship between the intensity of the laser beam at the time of test recording and the jitter value of the reproduced signal (the amount of change in the position of the reproduced signal with respect to the reference clock) is as shown in FIG. Assuming that the optimum laser light intensity is P1 and the maximum laser light intensity at which the jitter value is equal to or less than the predetermined reference value J1 is P2, the correction coefficient α is
P1 <P1 × α <P2
It can also be determined to satisfy

  For example, when T1 / T2 is used as the correction coefficient α, when the intensity of the corrected laser light corrected by the correction coefficient α exceeds the maximum laser light intensity P2 shown in FIG. It is preferable that a pulse condition near the intensity P2 is recorded as correction information. That is, as shown in FIG. 4, the relationship between the laser beam intensity obtained by the actual learning operation and the jitter value of the reproduced signal is such that the laser intensity (P1 × α) corrected by the correction coefficient α is larger than P2. Sometimes, it is preferable that the value recorded as the correction information is a value near the maximum laser light intensity P2, and it is more preferable that a value as close as possible to P2 is set as the correction information within a range not exceeding P2.

  Further, in the optical information recording medium 1 of the present embodiment, the second recording layer 3 has an area where recording is not performed at a radial position corresponding to the test recording area 105 of the first recording layer 5. are doing. Therefore, at the same radial position as the test recording area 105, no recording is performed on the second recording layer 3 located on the nearer side, so that the transmittance of the laser beam is always constant. As a result, in the learning operation in the test recording area 105 of the first recording layer 5, the constant operation is not affected by the transmittance difference between the recorded state and the unrecorded state of the second recording layer 3. Pulse conditions are obtained.

  On the other hand, since the second recording layer 3 is disposed closer to the laser beam irradiation side than the first recording layer 5, the second recording layer 3 is not affected by the recording state of the first recording layer 5. Therefore, a constant pulse condition is always obtained in the learning operation in the test recording area 102 of the recording layer 3.

  When recording user data in the information recording area 106 of the first recording layer 5, the laser light intensity is corrected using the correction coefficient α, so that the second recording layer 3 is in the recording state. User data can be correctly recorded by compensating for a decrease in the recording sensitivity of the first recording layer 5. Also, when information is recorded on the first recording layer 5 using the correction laser beam when the second recording layer 3 is in an unrecorded state, the quality of a reproduced signal of the recorded information satisfies a predetermined standard. If the correction coefficient α is set so as to satisfy, it is possible to perform better recording and reproduction of information irrespective of the presence or absence of recording on the second recording layer 3.

  In the present embodiment, the lead-in area is provided in the first recording layer 5 and the second recording layer 3, but at least one of the first recording layer 5 and the second recording layer 3 is provided. It is sufficient if it is provided. The information recorded in the lead-in area may be based on emboss pits.

  The method of the learning operation is not limited to the method described above. Test recording is performed while changing the recording / reproducing conditions, and the quality of a signal obtained by reproducing information recorded in the test recording is measured as needed. When the measurement result satisfies a predetermined condition as compared with the above condition, a simple method of setting the pulse condition at that time to an optimum pulse condition may be used.

  Further, in the present embodiment, the case where the transmittance of the second recording layer 3 is reduced by recording information has been described, but the same applies to the case where the transmittance of the second recording layer 3 is increased by recording information. The effect of is obtained. However, in this case, if the laser beam intensity under the corrected condition is smaller than the lower limit (minimum laser beam intensity) of the laser beam intensity that satisfies the constant condition of the signal reproduced in the learning operation, the laser beam intensity is decreased. It is preferable that the user data is recorded under pulse conditions that are set near the minimum laser light intensity. By using the laser light having the corrected intensity as described above, regardless of the presence or absence of recording on the second recording layer 3, it is possible to perform good information recording and reproduction while suppressing a decrease in signal quality.

  Further, instead of the correction coefficient α, transmittance change information indicating whether the transmittance is reduced or increased by recording information on the second recording layer 3 may be recorded on the medium as correction information. good. If the correction information is set in this way, it is possible to determine whether the transmittance decreases or increases when information is recorded on the second recording layer 3 by reading the transmittance change information. If the transmittance of the second recording layer 3 decreases due to the recording of information based on the transmittance change information, the intensity of the laser beam is determined in advance by the quality of the signal that is test-recorded in the first recording layer 5. If the user data is recorded under pulse conditions set near the maximum value that satisfies the specified criterion and the transmittance increases due to the recording of information, the intensity of the laser beam is signal-test-recorded in the first recording layer 5. The user data is recorded under pulse conditions set near the minimum value that satisfies a predetermined standard. Thereby, when user data is recorded in the information recording area 106 of the first recording layer 5, a decrease in recording sensitivity of the first recording layer 5 due to the recording state of the second recording layer 3 is suppressed, User data can be recorded correctly.

  In this embodiment, the optical information recording medium provided with two recording layers has been described. However, the configuration, correction information, and optical recording / reproducing method of the optical information recording medium described in this embodiment are described. Can be applied to an optical information recording medium having three or more recording layers.

(Embodiment 2)
Another embodiment of the optical information recording medium of the present invention will be described.

  FIG. 5 is a cross-sectional view illustrating a configuration of the optical information recording medium 11 according to the present embodiment. The optical information recording medium 11 is disk-shaped, and has a first recording layer 17 having a thickness of about 200 nm and a transparent separation layer 16 having a thickness of about 0.02 mm on a substrate 18 made of polycarbonate having a thickness of about 1.1 mm. A second recording layer 15 having a thickness of about 100 nm, a transparent separation layer 14 having a thickness of about 0.02 mm, a third recording layer 13 having a thickness of about 100 nm, and a protective layer 12 are sequentially provided. The first to third recording layers 17, 15, 13 are provided with, for example, information tracks (not shown) having a depth of about 20 nm and a width of about 0.2 μm for tracking laser light during recording and reproduction.

  In the optical information recording medium 11, a laser beam is irradiated from the surface on the protective layer 12 side.

  The third recording layer 13 is provided, for example, at a position with a radius of about 22 mm to 23 mm, and has a read-only area 111 for recording medium identification information and the like by wobbling an information track, and a radius of about 25 mm to 26 mm. And a test recording area 112 for performing a learning operation for finding an optimal pulse condition, and an information recording area 113 provided at a radius of about 26 mm to 58 mm for recording user data. .

  The second recording layer 15 is provided, for example, at a position with a radius of about 22 mm to 23 mm, and a read-only lead-in area 114 for recording medium identification information and the like by wobbling an information track, and a radius of about 24 mm to 25 mm. And a test recording area 115 for performing a learning operation for finding an optimal pulse condition, and an information recording area 116 provided at a radius of about 25 mm to 58 mm for recording user data. .

  The first recording layer 17 is provided, for example, at a position with a radius of about 22 mm to 23 mm, and has a read-only area 117 for recording medium identification information and the like by wobbling an information track, and a radius of about 23 mm to 24 mm. And a test recording area 118 for performing a learning operation for finding an optimal pulse condition, and an information recording area 119 provided at a radius of about 24 mm to 58 mm for recording user data. .

  The third recording layer 13 and the second recording layer 15 are composed of the same multilayer thin film (see FIG. 2) as the second recording layer 3 of the optical information recording medium 1 described in the first embodiment. In this embodiment, it is assumed that the transmittance is reduced by recording information. The recording layer 17 is composed of a multilayer thin film (see FIG. 2) similar to the first recording layer 5 of the optical information recording medium 1 described in the first embodiment.

  In the lead-in area 117 of the first recording layer 17, correction information for correcting the laser beam intensity is recorded. Further, in the lead-in area 117, together with the correction information, target recording layer information for specifying a recording layer on which user data is to be recorded using the laser beam corrected by the correction information is also recorded. In the present embodiment, as the correction information, for example, a correction coefficient for correcting the laser beam intensity based on a decrease in the transmittance of the second recording layer 15 when information is recorded on the second recording layer 15 α1, a correction coefficient α2 for correcting the laser beam intensity based on a decrease in the transmittance of the third recording layer 13 when information is recorded on the third recording layer 13, the second recording layer 15 and the third The correction coefficient α3 for correcting the laser beam intensity based on the decrease in the transmittance of the second recording layer 15 and the third recording layer 13 when information is recorded on both of the recording layers 13 is recorded. . The correction coefficients α1 and α2 are recorded together with the recording layer specifying information indicating the second recording layer 15 and the third recording layer 13, respectively, and the correction coefficient α3 is recorded on the third recording layer 13 and the second recording layer 15 respectively. Are recorded together with the recording layer specifying information indicating both recording layers.

  When the user data is recorded on the optical information recording medium 11, recorded recording layer information indicating the number of the recorded recording layer over the entire information recording area is stored in, for example, the information recording area 119 in the first recording layer 17. At a predetermined location (recorded recording layer information recording section). For example, if the recorded recording layer information is β, β = 100 if only the first recording layer 17 has been recorded, and β if the first recording layer 17 and the second recording layer 15 have been recorded. = 110, β = 010 if only the second recording layer 15 has been recorded, β = 001 if only the third recording layer 13 has been recorded, and the second recording layer 15 and the third recording layer If 13 has been recorded, β = 011, and if all the recording layers 17, 15, 13 have been recorded, β = 111.

  Then, when information is recorded on the optical information recording medium 11 again, the correction coefficients α1, α2 recorded in the lead-in area 117 of the first recording layer 17 and At the same time, α3 is read, and the recorded recording layer information recorded in the information recording area 119 of the first recording layer 17 is read.

  In addition, test recording was performed on each of the test recording areas 118, 115, and 112 of the first to third recording layers 17, 15, and 13 while changing pulse conditions, and the quality of signals recorded in the test recording was measured. A learning operation for obtaining an optimal pulse condition from the result is performed.

  When recording user data in the information recording area 113 of the third recording layer 13, recording is performed under the pulse conditions obtained by test recording in the test recording area 112.

  When recording user data in the information recording area 116 of the second recording layer 15, it is determined whether or not the third recording layer 13 has been recorded based on the recorded recording layer information. In the case of recording, recording is performed under the pulse condition obtained by the learning operation on the test recording area 115. When the third recording layer 13 is already recorded, the laser beam intensity of the pulse condition obtained by the learning operation on the test recording area 115 is recorded. Is recorded using a corrected laser beam corrected by the correction coefficient α2.

  When recording user data in the information recording area 119 of the first recording layer 17, it is determined from the recorded recording layer information whether the third recording layer 13 and the second recording layer 15 have been recorded. If both the third recording layer 13 and the second recording 15 are unrecorded, recording is performed under the pulse conditions obtained by the learning operation for the test recording area 118. When only the third recording layer 13 has been recorded, recording is performed using a corrected laser beam obtained by correcting the laser beam intensity under the pulse condition obtained by the learning operation for the test recording area 118 with the correction coefficient α2. If only the second recording layer 15 has been recorded, recording is performed with the corrected laser light obtained by correcting the laser light intensity under the pulse condition obtained by the learning operation for the test recording area 118 with the correction coefficient α1. When both the first recording layer 13 and the second recording layer 15 have been recorded, recording is performed with the corrected laser light obtained by correcting the laser light intensity under the pulse condition obtained by the learning operation for the test recording area 118 by the correction coefficient α3. I do.

  In the optical information recording medium 11 of the present embodiment, the third recording layer 13 has an area where recording is not performed at a radial position corresponding to the test recording area 115 of the second recording layer 15. . Further, at the radial position corresponding to the test recording area 118 of the first recording layer 17, the second recording layer 15 and the third recording layer 13 have areas where recording is not performed. In this way, no information is recorded on the recording layer on the nearer side at the radial positions corresponding to the test recording areas 115 and 118. Therefore, the learning operation in the test recording areas 115 and 118 is not affected by the difference in transmittance between the recorded state and the unrecorded state of the recording layer located on the laser beam incident side, so that it is always constant. Pulse conditions are obtained.

  When recording user data in the information recording areas 116 and 119 of the second recording layer 15 and the first recording layer 17, a correction coefficient corresponding to the recorded recording layer information is selected from the correction coefficients α1, α2 and α3. The user data is correctly recorded by selecting and compensating for a decrease in the recording sensitivity of the second recording layer 15 and the first recording layer 17 due to information recording on the third recording layer 13 and the second recording layer 15. It is possible to do.

  Note that the correction coefficients α1, α2, and α3 in the present embodiment can be set similarly to the correction coefficient α described in the first embodiment.

  In the present embodiment, the lead-in area is provided in all the recording layers 13, 15, and 17, but it is sufficient that the lead-in area is provided in at least one of the recording layers. The information in the lead-in area may be based on embossed pits.

  Further, in the present embodiment, three recording layers are used, but the same effect can be obtained even when two or four or more recording layers are used.

(Embodiment 3)
An embodiment of the optical recording / reproducing apparatus of the present invention will be described.

  FIG. 6 is a block diagram showing a configuration of the optical recording / reproducing apparatus of the present embodiment, and shows a state where the optical information recording medium 11 having a plurality of recording layers shown in FIG. 5 is mounted.

  The optical recording / reproducing apparatus shown in FIG. 6 includes a spindle motor 602 for mounting and rotating an optical information recording medium 11, a controller (control unit) 603, and a modulator 604 for converting data to be recorded into a recording signal. A laser driving circuit 605 for driving a semiconductor laser according to a recording signal from a modulator 604, and a semiconductor laser. The laser light is focused on the optical information recording medium 11 to record information, and the reflected light is An optical head 601 for obtaining a reproduction signal; a preamplifier 606 for amplifying the reproduction signal to generate an information reproduction signal 606S, a focus error signal 606F and a tracking error signal 606T; and a binary for converting the information reproduction signal 606S to a binary signal. Circuit 607, a data demodulation circuit 608 for demodulating data from the binary signal, and an optical information storage device. A signal quality determination circuit (signal quality determination unit) 609 for determining the quality of a signal obtained by experimentally recording and reproducing specific data in a test recording area of the medium 11, and recording for storing optimum recording conditions obtained by a learning operation. A condition storage circuit 612, a correction coefficient storage circuit (correction information storage unit) 610 for storing correction coefficients α1, α2, and α3 for correcting laser light intensity read from the optical information recording medium 11, and optical information A recorded recording layer information storage circuit (recorded recording layer storage unit) 611 for storing recorded recording layer information read from the recording medium 11, optimal recording conditions, recorded recording layer information, and correction coefficients α1, α2, and α3. Pulse condition setting circuit (pulse condition setting unit) 613 for controlling the intensity of the laser beam according to the above-mentioned formula, and the recording of the laser beam focused on the optical information recording medium 11 And a focus control circuit 614 for controlling the optical head 601 based on the focus error signal 606F so as to adjust the optical information recording medium 11 based on the tracking error signal 606T so that the laser beam appropriately scans the track of the optical information recording medium 11. A tracking control circuit 615 for controlling the head 601; an aberration control circuit 616 for controlling the optical head 601 so as to minimize the aberration of the laser beam on the target recording layer; and an optical information recording medium And a moving means 617 for moving in the radial direction.

  Here, the focus error signal 606F is generated by a general method called an astigmatism method. The tracking error signal 606T is generated by a general method called a push-pull method.

  FIG. 7 is a flowchart showing an optical recording / reproducing method using the optical recording / reproducing apparatus of FIG. Hereinafter, the optical recording / reproducing method according to the present embodiment will be described with reference to FIGS. 7, 5, and 6.

  First, the optical recording / reproducing apparatus is started (step (hereinafter, step is referred to as S) 1). More specifically, after the optical information recording medium 11 is mounted on the spindle motor 602 and rotated, the optical head 601 irradiates the optical information recording medium 11 with a laser beam for information reproduction. For example, the first recording layer 17 located farthest from the laser beam incident side is focused, the lead-in area 117 is accessed, the information track is tracked, and the identification information of the optical information recording medium 11 and Read the correction coefficient and the like. Further, a predetermined area of the information recording area 119 is accessed to read the recorded recording layer information. To read the identification information and the like, the information reproducing signal 606S obtained from the reflected light from the optical information recording medium 11 by the optical head 601 is binarized by a binarization circuit 607, and the binarized signal is data demodulated. The signal is demodulated by the circuit 608 and taken into the controller 603. The recorded recording layer information and the correction coefficients α1 to α3 are stored in the recorded recording layer information storage circuit 611 and the correction coefficient storage circuit 610, respectively.

  Next, a learning operation for finding the optimum recording / reproducing condition is performed (S2). The learning operation is performed in the following procedure. Specifically, first, the optical head 601 is moved to access the test recording area 118 of the first recording layer 17. The controller 603 sets the pulse condition setting unit 613 to a predetermined specific condition or a condition specified by identification information. Next, the modulator 604 converts the specific data for the learning operation output from the controller 603 into a laser drive signal. The laser drive circuit 605 drives a semiconductor laser provided in the optical head 601 according to the laser drive signal. The light emitted from the semiconductor laser is focused on the optical information recording medium 11 by the optical head 601, and a test signal is recorded in the test recording area 118. The signal quality determination circuit 609 measures the jitter value of the reproduced signal of the test-recorded data and compares it with a predetermined determination criterion to determine the signal quality. If the jitter value of the reproduced signal of the test-recorded data satisfies the criterion, the learning result is sent to the controller 603, and the learning operation ends. If the jitter value does not satisfy the determination criterion, the pulse condition is sequentially changed, and the test recording of the specific data and the signal quality of the test-recorded data are determined. This operation is repeated until the jitter value satisfies the criterion, thereby finding the optimum recording conditions. For the second recording layer 15 and the third recording layer 13, optimum recording conditions are determined in the same procedure.

  Next, the optimum recording condition obtained by the learning operation in S2 is stored in the recording / reproducing condition storage circuit 612 (S3).

  Next, a corresponding correction coefficient is selected from the correction coefficients based on the target recording layer information for specifying the recording layer on which the user data is to be recorded and the recorded recording layer information (S4).

  This is a case where user data is recorded on the first recording layer 17, and a correction determined based on a decrease in transmittance of the second recording layer 15 when information is recorded on the second recording layer 15 in S 1. A coefficient α1, a correction coefficient α2 determined based on a decrease in transmittance of the third recording layer 13 when information is recorded on the third recording layer 13, a third recording layer 13 and a second recording layer A correction coefficient α3 determined based on a decrease in the transmittance of the third recording layer 13 and the second recording layer 15 when information is recorded on both the optical information recording medium 15 and the information recording medium 15 is read from the optical information recording medium 11. In such a case, the selection of the correction coefficient is performed, for example, as follows. It is determined from the recorded recording layer information whether the third recording layer 13 and the second recording layer 15 have been recorded, and if both the third recording layer 13 and the second recording layer 15 have not been recorded, the correction is made. No coefficient is used, and the correction coefficient α2 is selected when only the third recording layer 13 has been recorded, and the correction coefficient α1 is selected when only the second recording layer 15 has been recorded. When both the recording layer 13 and the second recording layer 15 have been recorded, the correction coefficient α3 is selected.

  Next, a pulse condition is set based on the optimum recording condition and the correction coefficient, and the user data is recorded in the information recording area (S5).

  The pulse conditions include the intensity of the laser beam, the pulse length and the generation timing, and are set according to the length and interval of the mark to be recorded.

  Further, the latest recorded recording layer information is recorded in a predetermined area of the information recording area 119 of the optical information recording medium 11 (S6).

  As described above, the decrease in the recording sensitivity of the second recording layer 15 and the first recording layer 17 due to the recording of the user data on the third recording layer 13 and the second recording layer 15 is determined by using the correction coefficient. By compensating by correcting the laser beam intensity, user data can be correctly recorded.

  Note that the recorded recording layer information may include recorded address information for specifying the position of a recorded area where user data is recorded. In this case, the recorded address information is read before newly recording the user data, and the correction coefficient can be selected based on the position of the recorded area and the position where the user data is to be recorded.

  For example, when user data is recorded on the first recording layer 17, the second recording layer 15 has been recorded in the entire area from the recorded address information included in the recorded recording layer information read in S1, If it is determined that the third recording layer 13 has been recorded halfway, the radial position on the first recording layer 17 where information is to be recorded is changed to the recorded state of the second recording layer 15 in S4. The correction coefficient α3 is selected when the position corresponds to the radial position of the region, and the correction coefficient α1 is selected when the position corresponds to the radial position of the unrecorded region of the third recording layer 13.

  Thus, even if the recording layer disposed on the near side as viewed from the laser beam incident side is partially recorded, the recording on the near side is performed based on the relationship between the radial position of the recorded area and the radial position to be recorded. It is possible to reliably compensate for a decrease in recording sensitivity due to recording of user data in the layer.

  In the case of a write-once optical information recording medium in which recorded user data is not rewritten, it is preferable to determine in advance the order of recording user data in each recording layer. For example, when recording from the recording layer located at the back as viewed from the laser beam incident side to the recording layer located at the front in order, when recording information on the target recording layer, it is more than the target recording layer. Since all the recording layers located on the near side are in an unrecorded state, user data can be correctly recorded under the pulse conditions obtained by the learning operation. When information is recorded in order from the nearer recording layer to the farther recording layer, since the recording layers located before the target recording layer are all in the recording state, the control of the laser beam intensity is simplified. .

  When the order of the recording layers to be recorded is determined in advance, the recorded recording layer information and the recorded address information are recorded in a specific location of the optical information recording medium, and before recording new user data, Reads recorded recording layer information and recorded address information, performs learning operation only on the recording layer that records user data in the order from the recording layer that matches the recorded recording layer information, and determines pulse conditions for recording user data May be. In this case, since the test recording is performed only on the recording layer that may record the user data, the time required for the learning operation can be reduced.

FIG. 1 is a cross-sectional view showing an embodiment of the optical information recording medium of the present invention. FIG. 2 is a sectional view showing the optical information recording medium shown in FIG. 1 in more detail. FIG. 5 is a relationship diagram showing a relationship between the intensity of laser light and the jitter value of a reproduced signal at the time of test recording according to an embodiment of the present invention. FIG. 5 is a relationship diagram showing a relationship between the intensity of laser light and the jitter value of a reproduced signal at the time of test recording according to an embodiment of the present invention. FIG. 6 is a cross-sectional view showing another embodiment of the optical information recording medium of the present invention. FIG. 1 is a block diagram illustrating an embodiment of an optical recording / reproducing apparatus according to the present invention. 7 is a flowchart showing an optical recording / reproducing method using the optical recording / reproducing apparatus of FIG. FIG. 9 is a perspective view showing a conventional optical information recording medium.

Explanation of reference numerals

1,11 Optical information recording medium 2,12 Protective layer 3,5,13,15,17 Recording layer 4,14,16 Transparent separation layer 6,18 Substrate 101,104,111,114,117 Lead-in area 102, 105, 112, 115, 118 Test recording area 103, 106, 113, 116, 119 Information recording area 201, 203, 204, 206 Protective film 202, 205 Phase change film 207 Reflective film 601 Optical head 602 Spindle motor 603 Controller 604 Modulation 605 Laser drive circuit 606 Preamplifier 607 Binarization circuit 609 Signal quality judgment circuit 610 Correction coefficient storage circuit 611 Recorded recording layer information storage circuit 612 Recording condition storage circuit 613 Pulse condition setting circuit 614 Focus control circuit 615 Tracking control circuit 616 Difference control circuit 617 moving means

Claims (29)

It includes first to Nth recording layers (N is an integer of 2 or more) arranged in order from the side opposite to the laser light incident side, and the laser light incident from one surface is the first to Nth recording layers. An optical information recording medium in which information is recorded and reproduced by being irradiated on any one of the recording layers,
A correction information recording unit is provided in at least one of the first to Nth recording layers, and the correction information recording unit includes an unrecorded state and a recorded state in the second to Nth recording layers. An optical information recording medium, on which correction information for correcting a laser beam intensity based on a change in transmittance during the recording is recorded. At least one of the first to Nth recording layers includes a read-only read-in area,
The optical information recording medium according to claim 1, wherein the correction information recording unit is provided in the lead-in area. The optical information recording medium has a disk shape,
The first to Nth recording layers include at least a test recording area for performing test recording and an information recording area for recording user data,
The test recording area of the K-th recording layer (K is an arbitrary integer satisfying 1 ≦ K ≦ N−1) is the test recording area and the information recording area of the K + 1-th to N-th recording layers. 2. The optical information recording medium according to claim 1, wherein the optical information recording medium is arranged at different radial positions. The first to Nth recording layers are provided with guide grooves for tracking laser light,
In the K + 1-th to N-th recording layers, a guide groove having substantially the same shape as the guide groove of the information recording area is provided at a radial position where the test recording area of the K-th recording layer is arranged. 4. The optical information recording medium according to claim 3, wherein:   2. The optical information recording medium according to claim 1, wherein the correction information is a correction coefficient obtained from the transmittance T1 in the unrecorded state and the transmittance T2 in the recorded state in the second to Nth recording layers. The correction information is a correction coefficient,
The correction coefficient is at least one of the (K + 1) th to Nth recording layers disposed closer to the laser beam incident side than the Kth recording layer (K is any integer satisfying 1 ≦ K ≦ N−1). When any one is in an unrecorded state, the quality of a reproduction signal of information recorded on the Kth recording layer using the correction laser light corrected by the correction coefficient is set to satisfy a predetermined standard. 2. The optical information recording medium according to claim 1, wherein:   2. The optical information recording medium according to claim 1, wherein the correction information is transmittance change information indicating whether the transmittance is reduced or increased by recording information on the second to Nth recording layers. 3. .   2. The correction information recording unit according to claim 1, wherein target recording layer information for specifying a recording layer on which user data is to be recorded using the laser light corrected by the correction information is recorded together with the correction information. The optical information recording medium according to the above.   A recording layer specifying information for specifying any of the recording layers disposed on the laser beam incident side of the target recording layer is recorded in the correction information recording section together with the correction information and the target recording layer information. Item 10. An optical information recording medium according to Item 8.   The first to Nth recording layers include an information recording area for recording user data, and at least one of the information recording areas included in the first to Nth recording layers includes the information recording area. The optical information recording medium according to claim 1, further comprising a recorded recording layer information recording unit that records recorded recording layer information indicating a recording layer in which a recording area has been recorded.   The optical information recording medium according to claim 10, wherein the recorded recording layer information includes recorded address information for specifying a position of a recorded area. It includes first to Nth recording layers (N is an integer of 2 or more) arranged in order from the side opposite to the laser beam incident side, and includes at least one of the first to Nth recording layers. Is provided with a correction information recording section, and the correction information recording section corrects a laser beam intensity based on a change in transmittance between an unrecorded state and a recorded state in the second to Nth recording layers. An optical recording and reproducing method for recording and reproducing information on an optical information recording medium on which correction information for recording is recorded,
When recording / reproducing information on the K-th recording layer (K is an arbitrary integer satisfying 1 ≦ K ≦ N−1), the pulse condition including the intensity of the laser beam using the correction information is used. And an optical recording / reproducing method. The optical information recording medium has a disk shape, and the first to Nth recording layers include at least a test recording area for performing test recording and an information recording area for recording user data. The test recording area of the K-th recording layer is located at a different radial position from the test recording area and the information recording area of the (K + 1) -th to N-th recording layers.
When information is recorded on the Kth recording layer, a test recording is performed in a test recording area of the Kth recording layer, and a pulse including the intensity of laser light is used by using the result of the test recording and the correction information. The optical recording / reproducing method according to claim 12, wherein the condition is determined. When the correction information is a correction coefficient, and the correction coefficient is at least one of the (K + 1) th to (N) th recording layers disposed closer to the laser beam incident side than the (K) th recording layer, an unrecorded state is provided. The quality of a reproduction signal of information recorded on the Kth recording layer using the correction laser light corrected by the correction coefficient is set so as to satisfy a predetermined criterion,
13. The optical recording / reproducing method according to claim 12, wherein when recording information on the K-th recording layer, a pulse condition including the intensity of laser light is determined using the correction coefficient.   The optical recording / reproducing method according to claim 14, wherein the quality of the reproduced signal is evaluated by measuring a jitter value of the reproduced signal. The correction information is transmittance change information indicating whether the transmittance is reduced or increased by recording information for the second to Nth recording layers,
13. The optical recording / reproducing method according to claim 12, wherein when recording information on the Kth recording layer, the intensity of the laser beam is changed according to the transmittance change information. The optical information recording medium, the correction information recording unit, the target recording layer information to specify a target recording layer to record user data using a laser beam corrected by the correction information, the target Recording layer specifying information for specifying any of the recording layers disposed on the laser beam incident side of the recording layer to be recorded together with the correction information, and in the first to Nth recording layers In a recorded recording layer information recording section provided in at least one of the included information recording areas, recorded recording layer information indicating a recording layer in which the information recording area is recorded is recorded, and further, The correction information includes a plurality of correction coefficients,
When information is recorded on the K-th recording layer, target recording layer information that matches the K-th recording layer is read out, and the recording layer identification information recorded together with the read target recording layer information is used. A correction coefficient recorded together with the recording layer identification information that matches the recorded recording layer information is selected from the plurality of correction coefficients, and a pulse condition including the intensity of the laser beam is determined using the selected correction coefficient. An optical recording / reproducing method according to claim 12.   According to the recorded recording layer information, it is determined whether or not each recording layer disposed on the laser beam incident side of the target recording layer is recorded, and a correction coefficient is selected according to the recorded recording layer. Item 18. An optical recording / reproducing method according to Item 17.   18. The optical system according to claim 17, wherein the recorded recording layer information includes recorded address information for specifying a position of a recorded area, and the recorded address information is further used when selecting the correction coefficient. Recording and playback method. Laser light is irradiated from one side to an optical information recording medium including first to Nth recording layers (N is an integer of 2 or more) arranged in this order from the side opposite to the laser light incident side. An optical recording and reproducing method for recording and reproducing information by
The order in which user data is recorded on the first to Nth recording layers is determined in advance, and recorded recording layer information for specifying a recording layer on which user data is already recorded is recorded on the optical information recording medium. The recording is performed at a predetermined location, the recorded recording layer information is read out before recording new user data, and a predetermined order is determined for the recording layers subsequent to the recording layer that matches the recorded recording layer information. An optical recording / reproducing method, characterized in that user data is recorded by the method.   21. The optical recording / reproducing method according to claim 20, wherein the recorded recording layer information includes recorded address information for specifying a position of a recorded area. It includes first to Nth recording layers (N is an integer of 2 or more) arranged in order from the side opposite to the laser light incident side, and includes at least one of the first to Nth recording layers. Is provided with a correction information recording section, and the correction information recording section corrects a laser beam intensity based on a change in transmittance between an unrecorded state and a recorded state in the second to Nth recording layers. An optical recording and reproducing apparatus that performs recording and reproduction of information on an optical information recording medium on which correction information for recording is recorded,
A correction information storage unit that stores the correction information recorded on the optical information recording medium,
Using the correction information stored in the correction information storage unit, a control unit that determines a pulse condition for recording user data,
An optical recording / reproducing apparatus, comprising: a pulse condition setting unit configured to control a laser beam using the pulse condition determined by the control unit. The optical information recording medium has a disk shape, and the first to Nth recording layers include at least a test recording area for performing test recording and an information recording area for recording user data. The test recording area of the K-th recording layer (K is an arbitrary integer satisfying 1 ≦ K ≦ N−1) includes the test recording area and the information recording area of the (K + 1) to N-th recording layers. Are located at different radii,
The optical recording / reproducing apparatus further includes a signal quality determination unit that determines the quality of a reproduction signal of test-recorded information, wherein the control unit uses the correction information and a result of the test recording to convert user data. The optical recording / reproducing apparatus according to claim 22, wherein pulse conditions for recording are determined. The optical information recording medium, the correction information recording unit, the target recording layer information to specify a target recording layer to record user data using a laser beam corrected by the correction information, the target Recording layer specifying information for specifying any of the recording layers disposed on the laser beam incident side of the recording layer to be recorded together with the correction information, and in the first to Nth recording layers In the recorded recording layer information recording portion provided in at least one of the included information recording areas, recorded recording layer information indicating a recording layer in which the information recording area is recorded, is recorded,
The optical recording and reproducing device,
The optical information recording medium further includes a recorded recording layer information storage unit that stores recorded recording layer information recorded on the optical information recording medium, the control unit, using the correction information and the recorded recording layer information 23. The optical recording and reproducing apparatus according to claim 22, wherein a pulse condition for recording user data is determined. The correction information includes a plurality of correction coefficients,
When recording information on the K-th recording layer (K is an integer that satisfies 1 ≦ K ≦ N−1), the control unit performs target recording that matches the K-th recording layer. The layer information is read, and among the recording layer specifying information recorded together with the read target recording layer information, the correction coefficient recorded together with the recording layer specifying information coinciding with the recorded recording layer information is used as the plurality of correction coefficients. The optical recording / reproducing apparatus according to claim 24, wherein a pulse condition for recording user data is determined using the selected correction coefficient.   The control unit determines, based on the recorded recording layer information, whether or not each recording layer disposed closer to the laser beam incident side than the target recording layer has been recorded, and corrects according to the recorded recording layer. The optical recording / reproducing apparatus according to claim 25, wherein the coefficient is selected.   26. The recorded recording layer information includes recorded address information for specifying a position of a recorded area, and the control unit further uses the recorded address information when selecting the correction coefficient. The optical recording / reproducing apparatus according to claim 1.   24. The optical recording / reproducing apparatus according to claim 23, wherein the signal quality determining unit measures a jitter value of the reproduced signal to evaluate the quality of the reproduced signal.   23. The optical recording / reproducing apparatus according to claim 22, wherein the pulse condition includes a laser beam intensity, a pulse length, and a generation timing, and is set according to at least one of a mark length and a mark interval to be recorded.

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