JP4480644B2 - Optical recording method, optical recording apparatus, one-chip CPU element, and computer program - Google Patents

Description

  The present invention relates to information recording on an optical recording medium having a plurality of recording layers, and more particularly to an optical recording method, an optical recording apparatus, a micro CPU element, and a computer program capable of shortening a test time during information writing. Is.

  2. Description of the Related Art Conventionally, in an optical recording apparatus that records data on a well-known optical recording medium (optical recording medium) such as a DVD using laser light, when information is recorded on a predetermined recording medium, generally, actual information is recorded. Prior to recording, a recording condition suitable for the recording medium is obtained by test recording using a test recording area provided in the recording medium.

  However, when recording information on a multi-layer optical recording medium having a plurality of recording layers in an optical recording apparatus in which the demand for high-speed and large-capacity recording increases, recording sensitivity, light reflectance, thermal conductivity, etc. Therefore, it is necessary to obtain a recording pulse condition corresponding to each recording layer.

  As a conventional technique for obtaining such a recording pulse condition, as shown in FIGS. 19 and 20, good recording can be made for each recording layer in accordance with conditions such as recording speed for each type of recording medium. A data table in which recording pulse conditions are recorded is stored in advance in a memory of a recording drive (optical recording device), and when information is actually recorded on a recording medium, it depends on the recording medium type, recording layer, and recording speed. A method is generally used in which the recording pulse conditions are read from the data table, set, and recorded.

In addition, in consideration of individual differences and variations in the recording drive itself, temperature dependency of the laser, etc., a method of adjusting only the recording laser power condition in test recording performed prior to information recording is also generally used. ing.
JP 2005-100610 A JP 2003-22532 A JP 2004-171740 A JP 2004-247024 A WO2002-029791 JP 2003-178448 A

  However, in the above prior art, the burden on the memory capacity of the finite recording drive is large, and the use of a high-capacity memory leads to an increase in the cost of the recording drive. The first problem is as follows.

  In addition, recording media and recording drives that cannot be compensated for by recording laser power alone cannot be fully dealt with, and recording media and recording drives that were not previously stored in the memory of the recording drive were released after the release. Some of the “unknown types of optical recording media” such as media are also supported in the form of firmware upgrades, but have a second problem that they cannot be adequately handled.

  Furthermore, there is a third problem that a required time other than information recording increases due to test recording in a plurality of layers.

  There is a demand for the construction of a recording condition optimization method for a multi-layered optical disk corresponding to the above three problems.

  The present invention has been made in view of the above problems, and an object thereof is to provide an optical recording method, an optical recording apparatus, and a one-chip CPU capable of recording information in a short time by shortening a test time before information recording. It is to provide an element and a computer program.

In order to achieve the above object, the present invention provides an optical recording apparatus for recording information by irradiating a laser beam pulse onto a recording medium composed of a plurality of layers including one recording layer and another recording layer. An optical recording method for recording and reproducing test data in a test area of the recording layer to derive a recording pulse condition and irradiating the recording medium with a laser light pulse based on the recording pulse condition to record information The optical recording apparatus records test data having a predetermined data pattern on one recording layer prior to actual information recording and reproduces the test data, and is suitable for one recording layer by the test recording. First recording step for deriving the recording pulse condition and test recording in the other recording layer using a data pattern in which only signals having a short pulse width are arranged to derive the recording pulse condition for the other recording layer Do We propose an optical recording method of performing a 2 derivation step.

According to the optical recording method of the present invention, test data having a predetermined data pattern is recorded on one recording layer prior to actual information recording, and this is reproduced, and this test recording is suitable for one recording layer. A recording pulse condition is derived. Further, in the other recording layer, test recording is performed using test data having a data pattern in which only signals having a short pulse width are arranged, and the recording pulse condition of the other recording layer is derived.

In order to achieve the above object, the present invention provides an optical recording apparatus having means for executing each processing step in the optical recording method, a one-chip CPU element used in the optical recording apparatus, and the optical recording apparatus. A computer program for executing the optical recording method by driving a CPU to be used is proposed.

According to the optical recording method of the present invention, test data having a predetermined data pattern is recorded on one recording layer prior to actual information recording, and this is reproduced, and this test recording is suitable for one recording layer. The recording pulse condition is derived, and in the other recording layer, test recording is performed using test data having a data pattern in which only signals having a short pulse width are arranged, and the recording pulse condition of the other recording layer is derived. Therefore, the test time for deriving the recording pulse conditions of the other recording layers can be shortened, and the test time before information recording can be shortened to record information in a short time. Furthermore, the recording area used for test recording can be reduced as compared with the conventional case.

  Moreover, according to the optical recording apparatus of the present invention, the above optical recording method can be easily realized.

  Furthermore, according to the micro CPU element of the present invention, the above optical recording method can be easily realized.

  In addition, according to the computer program of the present invention, the optical recording method can be easily realized using an arbitrary CPU.

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

  FIG. 1 is a diagram showing a configuration of an optical recording apparatus and a configuration of an optical disc in the first embodiment of the present invention. In the figure, reference numeral 10 denotes an optical disk, which is a known multi-layer optical recording medium such as a DVD, HD-DVD, or Blu-ray disk. In this embodiment, the first recording layer 11 from the position farthest from the laser light irradiation surface, The optical recording medium has two recording layers in the order of the second recording layer 12. In this embodiment, an optical recording medium having two recording layers will be described. However, information can be recorded / reproduced by the optical recording apparatus 100 using an optical recording medium having three or more recording layers as an optical disc 10. it can.

  An optical recording apparatus 100 includes an optical pickup 110, a laser diode (hereinafter referred to as LD) driver 121, a slicer 122, a data demodulation circuit 123, a characteristic value detection unit 124, and a one-chip CPU element (hereinafter referred to as CPU) 125. A memory 127 and an interface (hereinafter referred to as I / F) 128. Here, only components that are particularly relevant to the present invention will be described.

  Further, the optical recording apparatus 100 is connected with a display unit 131 including a personal computer and a display, and an operation unit 132 including a keyboard.

  The optical pickup 110 includes a laser diode (hereinafter referred to as LD) 111, a photodetector (hereinafter referred to as PD) 112, a collimator lens 113, an objective lens 114, a detection lens 115, and a beam splitter 116. The laser light emitted from the LD 111 passes through the collimating lens 113, the beam splitter 116, and the objective lens 114, and is irradiated onto the optical disc 10. Further, the laser beam reflected by the optical disk 10 passes through the objective lens 114, is reflected by the beam splitter 116, and enters the PD 112 via the detection lens 115. The PD 112 outputs a current having a value corresponding to the amount of incident light.

  The LD driver 121 supplies a drive current to the LD 111 based on the recording signal input from the CPU element 125 to cause the LD 111 to emit light.

  The slicer 122 slices the output current from the PD 112 with a predetermined threshold value, converts it into a binary voltage signal, and outputs it.

  The data demodulating circuit 123 is a circuit that demodulates the coded binary signal output from the slicer 122 and outputs the demodulated signal to the CPU 125. For example, the data demodulating circuit 123 outputs the binary voltage signal 3T to A digital signal obtained by demodulating a signal encoded by EFM modulation with a pulse width of 11T is output to the CPU 125.

  The characteristic value detector 124 receives the current signal output from the PD 112, detects the characteristic value from the reflected light from the optical disk 10 based on this current value, and outputs it to the CPU 125 as digital information. The characteristic value detected from the reflected light may be any characteristic value that depends on the recording laser power and the recording pulse condition and is suitable for optimizing the recording pulse condition. In this embodiment, β, asymmetry (Asymmetry), phase, amplitude, etc. are detected.

  The CPU 125 is a well-known one-chip CPU element, and includes a memory circuit 126 in which a computer program for causing the CPU to operate is stored. Further, the CPU 125 controls a drive mechanism (not shown) to adjust the position, tracking, and focus of the light pickup 110 and to control the rotational drive of the optical disc 10, and based on the data table stored in the memory 127. Then, data input from the outside is recorded (written) on the optical disc 10, or data recorded on the optical disc 10 is read and output to an external device. Further, a test at the time of recording information on the optical disk 10 is performed by a process described later to obtain an optimum laser favorable condition so that data can be recorded.

  The memory circuit 127 is connected to the CPU 125, and data corresponding to other types of optical disks is recorded in the data table as a strategy table similar to the conventional example.

  The I / F 128 is an interface for connecting the CPU to the external display unit 131 and the operation unit 132, and transfers recording / reproduction data between the external device and the CPU 125.

  In the above configuration, information is recorded on and reproduced from the optical disk 10 using the laser beam output from the LD 111, and data is transmitted to and received from an external device such as a personal computer (PC). The optical recording apparatus 100 records information in the order of the first recording layer 11 and the second recording 12 when recording data on the optical disc 10.

  When recording information on the optical disc 10, the recording data is encoded, and the encoded recording data is processed by the CPU 125 to determine a strategy as a recording condition for the optical disc 10, and this strategy is used as an LD driver. In 121, the laser beam is converted into a recording pulse, and laser light pulsed based on the recording pulse is output from the LD 111.

  The LD driver 121 drives the LD 111 based on the input recording pulse. The LD 111 controls the output laser beam in response to the recording pulse, and the controlled laser beam is used for the collimating lens 113, the beam splitter 116, the objective. The optical disk 10 rotating at a constant linear velocity or a constant rotational speed is irradiated via the lens 114, whereby a recording pattern composed of pits and space rows corresponding to desired recording data is recorded on the optical disc 10.

  Further, when data is recorded on the optical disk 10, as is well known, test data is recorded in the test area of the optical disk 10 and reproduced, thereby determining the optimum laser light irradiation condition. In the optical recording apparatus 100 of the present embodiment, the test time for determining the laser light irradiation condition can be shortened compared to the conventional case.

  Hereinafter, a method for determining the irradiation condition of the laser beam in the present embodiment will be described in detail.

  FIG. 2 is a flowchart for explaining a recording process on the recording layer in the first embodiment. A computer program for executing this processing is stored in advance in the memory circuit 126 of the CPU 125, and the CPU 125 performs these processing. In this embodiment, the test process for recording data on the first recording layer 11 of the optical disc 10 is substantially the same as the conventional one, but the test process for recording data on a recording layer other than the first recording layer 11 is used. Unlike the test process in the first recording layer 11, the time can be shortened.

  That is, when data is recorded on the first recording layer 11, the process shown in FIG. 2 is executed. When the process is started, it is determined whether or not the recording is performed on the first recording layer 11 of the optical disc 10 (SA1). When recording information on a recording layer other than the first recording layer 11, the process proceeds to the process of SA 9, which will be described later, and when recording data on the first recording layer 11, optimization of the recording laser beam intensity as in the conventional case ( OPC: Optimum Power Control (hereinafter referred to as OPC) is used to perform a predetermined number of tests using laser power adjustment test recording and pulse width adjustment test recording using the adjustment data pattern, and the recorded information is reproduced (SA2). A parameter (characteristic value) under laser light irradiation conditions is detected (SA3). Examples of this parameter include β (Asymmetry), laser beam irradiation power, and pulse phase in the case of DVD. Further, the laser power adjustment test recording is performed by changing the laser power (Wrigte PW) stepwise as shown in FIG. 3, and the pulse width adjustment test recording is similarly performed by changing the pulse width stepwise. When detecting the above parameters, if the strategy table data stored in the memory 127 can be used, it is used, and the strategy table data stored in the memory 127 cannot be used. In the case of the type of optical disk 10, a well-known auto strategy detection process is performed.

  Next, a characteristic relational expression is derived from the obtained parameters (SA4). As this characteristic relational expression, for example, a characteristic relational expression expressing the relationship between the laser power (Wrigte PW) and β as shown in the graph of FIG. 4, and a laser power (Wrigte PW) as shown in the graph of FIG. A characteristic relational expression representing a phase correction parameter in relation to the pulse phase, and a pulse phase in relation to a pulse phase difference (Pluse (Topr, Tlast)) as shown in the graph of FIG. A characteristic relational expression representing the correction parameter is derived. Here, from the test data recorded by changing the laser power stepwise, two types of parameters, that is, a characteristic relational expression expressing the relationship between the laser power (Wrigte PW) and β as shown in the graph of FIG. A characteristic relational expression representing a phase correction parameter in the relationship between the laser power (Wrigte PW) and the pulse phase as shown in the graph of FIG. 5 is derived.

  Thereafter, the optimum recording pulse condition of the laser power and the pulse width is derived using the parameters obtained from the characteristic relational expression obtained (SA5), and the actual recording on the first recording layer 11 is performed using the optimum recording pulse condition. Is recorded (SA6).

  Next, it is determined whether or not the recording layer needs to be changed in the middle of data recording (SA7). When the recording layer needs to be changed, the process proceeds to SA1, and when it is not necessary, the information is recorded. It is determined whether or not the processing has been completed (SA8). If the result of this determination is that recording of information has not ended, the process proceeds to SA6. If recording of information has ended, the process ends.

  On the other hand, when information is recorded on a recording layer other than the first recording layer 11 as a result of the determination of SA1, first, the same adjustment as that used for the test of the first recording layer 11 is performed by the same OPC as before. The test using only the laser power adjustment test recording is performed by the number of times less than the number of times in the first recording layer 11 using the data pattern, and the recorded information is reproduced (SA9). ) Is detected (SA10). The laser power adjustment test recording is performed by changing the laser power (Wrigte PW) step by step as shown in FIG.

  Next, a characteristic relational expression is derived from the obtained parameters (SA11). As this characteristic relational expression, for example, a characteristic relational expression representing a phase correction parameter in the relation between the laser power (Wrigte PW) and the pulse phase as shown in the graph of FIG. 7 is derived. As described above, when recording on the second recording layer 12, only the characteristic relational expression different from that of the first recording layer 11 is derived, so that the time can be shortened.

  Thereafter, using the parameters obtained from the characteristic relational expression obtained above and the characteristic relational expression obtained in the first recording layer 11, the pulse phase correction in the relationship between the pulse positional deviation and the pulse phase in the other recording layer 12 is performed. A characteristic relational expression representing a parameter, that is, a pulse phase correction parameter in relation to a pulse phase and a positional deviation (Pluse (Topr, Tlast)) of the pulse as shown in the graph of FIG. 8 is predicted (SA12). ).

  Next, the optimum recording pulse condition of the laser power and the pulse width is derived using the above characteristic relational expression (SA13). Thereafter, information is recorded on the optical disc 10 using the obtained optimum recording pulse condition (SA6).

  Next, it is determined whether or not the recording layer needs to be changed in the middle of data recording (SA7). When the recording layer needs to be changed, the process proceeds to SA1, and when it is not necessary, the information is recorded. It is determined whether or not the processing has been completed (SA8). If the result of this determination is that recording of information has not ended, the process proceeds to SA6. If recording of information has ended, the process ends.

  According to the above embodiment, test recording is performed on the first recording layer 11 prior to actual information recording, and a recording pulse condition suitable for the first recording layer 11 is derived within a predetermined test time. In the second recording layer 12, only the test for changing the laser power is performed, the test for changing the pulse width that uses a lot of time and the test area is not performed, and the time is shorter than the test time in the first recording layer 11 Since the recording pulse condition is derived, the test time for deriving the recording pulse condition of the second recording layer 12 can be shortened, and the test time before information recording can be shortened to record information in a short time. can do.

  As described above, in the normal test recording, the characteristic relationship between the laser power and β is obtained in the laser power adjustment test, the optimum laser power is derived from this characteristic relationship, and the pulse-to-phase deviation is determined in the pulse width adjustment test. In this embodiment, only the laser power adjustment test is performed for the recording layers other than the first recording layer 11, and the test recording condition is determined. By reducing the number and reducing the test time, a strategy having an optimum laser power and pulse width can be derived.

  Further, according to the optical recording apparatus 100 of the present embodiment, the optical recording method can be easily realized. Furthermore, according to the micro CPU element 125 of the present embodiment, the optical recording method can be easily realized. Further, according to the computer program of the present embodiment, the optical recording device 100 and the optical recording method can be easily realized using an arbitrary CPU.

  In the above embodiment, an example using a well-known multilayer DVD as the optical disk 10 has been described. However, the same effect can be obtained by the same processing when an HD-DVD is used as the optical disk 10. When a well-known Blu-ray disc is used as the optical disc 10, the standard is different from that of DVD. Therefore, in the first recording layer, laser power (Write PW) and asymmetry as shown in the graph of FIG. , A characteristic relational expression expressing a phase correction parameter in a relation between laser power (Write PW) and amplitude as shown in the graph of FIG. 10, and a pulse as shown in the graph of FIG. A characteristic relational expression representing a phase correction parameter in relation to the positional deviation (Pluse (Topr, Tlast)) and amplitude of the leading edge and the trailing edge of the recording layer is derived. The characteristic relational expression showing the phase correction parameter in the relation between the laser power (Write PW) and the amplitude as shown in the graph of Fig. 5 13 to predict a characteristic relational expression representing a phase correction parameter in the relation between the positional deviation (Pluse (Topr, Tlast)) of the pulse and the amplitude as shown in the graph of FIG. 13 in the other recording layer. The optimum value in the other recording layer can be obtained. The pulse width adjustment parameter (evaluation index) means phase shift, length shift, and amplitude shift.

  Next, a second embodiment of the present invention will be described.

  The apparatus configuration of this embodiment is the same as that of the first embodiment described above. The difference from the first embodiment is that the second embodiment uses a CPU 125 that stores a computer program with different recording processing. . In the following description, the same components as those in the first embodiment will be described using the same reference numerals.

  Hereinafter, a method for determining the recording pulse condition of the laser beam in the present embodiment will be described in detail.

  FIG. 14 is a flowchart for explaining the recording process to the recording layer in the second embodiment. A computer program for executing this processing is stored in advance in the memory circuit 126 of the CPU 125, and the CPU 125 performs these processing. In this embodiment, the test process for recording data on the first recording layer 11 of the optical disc 10 is substantially the same as the conventional one, but the test process for recording data on a recording layer other than the first recording layer 11 is used. Unlike the test process in the first recording layer 11, the time can be shortened.

  That is, when data is recorded on the first recording layer 11, as shown in FIG. 14, it is determined whether or not the recording is on the first recording layer 11 of the optical disc 10 (SB1). When recording information on a recording layer other than the first recording layer 11, the process proceeds to SB9, which will be described later. When recording data on the first recording layer 11, an adjustment data pattern is formed by OPC as in the prior art. The test using the laser power adjustment test recording and the pulse width adjustment test recording is performed in a predetermined use area, the recorded information is reproduced (SB2), and the parameter (characteristic value) in the laser light irradiation condition is detected. (SB3). Examples of this parameter include β (Asymmetry), laser beam irradiation power, and pulse phase in the case of DVD. Further, the laser power adjustment test recording is performed by changing the laser power (Wrigte PW) stepwise as shown in FIG. 3, and the pulse width adjustment test recording is similarly performed by changing the pulse width stepwise. When detecting the above parameters, if the strategy table data stored in the memory 127 can be used, it is used, and the strategy table data stored in the memory 127 cannot be used. In the case of the type of optical disk 10, a well-known auto strategy detection process is performed.

  Next, a characteristic relational expression is derived from the obtained parameters (SB4). This characteristic relational expression is the same as in the first embodiment.

  Thereafter, the optimum recording pulse condition of the laser power and the pulse width is derived using the parameters obtained from the characteristic relational expression obtained above (SB5), and the actual recording on the first recording layer 11 is performed using the optimum recording pulse condition. Is recorded (SB6).

  Next, it is determined whether or not the recording layer needs to be changed during the data recording (SB7). When the recording layer needs to be changed, the process proceeds to SB1, and when it is not necessary, the information is recorded. It is determined whether or not the processing has been completed (SB8). If the result of this determination is that recording of information has not ended, the process proceeds to step SB6. If recording of information has ended, the process ends.

  On the other hand, when the information is recorded on the recording layer other than the first recording layer 11 as a result of the determination of SB1, first, the same adjustment as that used for the test of the first recording layer 11 is performed by the same OPC as in the past. The test using only the laser power adjustment test recording using the data pattern is performed using the use area smaller than the use area in the first recording layer 11, and the recorded information is reproduced (SB9). A parameter (characteristic value) is detected (SB10). The laser power adjustment test recording is performed by changing the laser power (Wrigte PW) step by step as shown in FIG.

  Next, a characteristic relational expression is derived from the obtained parameters (SB11). As this characteristic relational expression, for example, a characteristic relational expression representing a pulse phase correction parameter in the relationship between the laser power (Wrigte PW) and the pulse phase as shown in the graph of FIG. 7 is derived. As described above, when recording on the second recording layer 12, only the characteristic relational expression different from that of the first recording layer 11 is derived, so that the time can be shortened.

  Thereafter, using the parameters obtained from the characteristic relational expression obtained above and the characteristic relational expression obtained in the first recording layer 11, the pulse phase correction in the relationship between the pulse positional deviation and the pulse phase in the other recording layer 12 is performed. A characteristic relational expression representing a parameter, that is, a pulse phase correction parameter in relation to a pulse phase and a positional deviation (Pluse (Topr, Tlast)) of a pulse as shown in the graph of FIG. 8 is predicted (SB12). ).

  Next, the optimum recording pulse condition of the laser power and the pulse width is derived using the above characteristic relational expression (SB13). Thereafter, information is recorded on the optical disk 10 using the optimum recording pulse condition obtained (SB6).

  Next, it is determined whether or not the recording layer needs to be changed during the data recording (SB7). When the recording layer needs to be changed, the process proceeds to SB1, and when it is not necessary, the information is recorded. It is determined whether or not the processing has been completed (SB8). If the result of this determination is that recording of information has not ended, the process proceeds to step SB6. If recording of information has ended, the process ends.

  According to the embodiment, test recording is performed in a predetermined test use area on the first recording layer 11 prior to actual information recording, and a recording pulse condition suitable for the first recording layer 11 is within a predetermined test time. In the second recording layer 12, only the test for changing the laser power is performed, and the test for changing the pulse width that uses a lot of time and the test area is not performed. Since the test recording is performed using the test use area smaller than the test use area and the recording pulse condition is derived, the test time for deriving the recording pulse condition of the second recording layer 12 can be shortened. Information can be recorded in a short time by shortening the test time before recording.

  Further, according to the optical recording apparatus 100 of the present embodiment, the optical recording method can be easily realized. Furthermore, according to the micro CPU element 125 of the present embodiment, the optical recording method can be easily realized. Further, according to the computer program of the present embodiment, the optical recording device 100 and the optical recording method can be easily realized using an arbitrary CPU.

  In the above embodiment, an example using a known multi-layer DVD as the optical disk 10 has been described. However, when an HD-DVD or a well-known Blu-ray disk is used as the optical disk 10 as in the first embodiment. The same effect can be obtained by the same processing.

  Next, a third embodiment of the present invention will be described.

  The apparatus configuration of this embodiment is the same as that of the first embodiment described above. The difference from the first embodiment is that the third embodiment uses a CPU 125 that stores a computer program with a different recording process. . In the following description, the same components as those in the first embodiment will be described using the same reference numerals.

  FIG. 15 is a flowchart for explaining a recording process to the recording layer in the third embodiment. A computer program for executing this processing is stored in advance in the memory circuit 126 of the CPU 125, and the CPU 125 performs these processing. In this embodiment, the test process for recording data on the first recording layer 11 of the optical disc 10 is substantially the same as the conventional one, but the test process for recording data on a recording layer other than the first recording layer 11 is used. Unlike the test process in the first recording layer 11, the time can be shortened.

  That is, when data is recorded on the first recording layer 11, as shown in FIG. 15, it is determined whether or not the recording is on the first recording layer 11 of the optical disc 10 (SC1). When recording information on a recording layer other than the first recording layer 11, the process proceeds to the process of SC9, which will be described later. When recording data on the first recording layer 11, an adjustment data pattern is formed by OPC as in the prior art. The test using the laser power adjustment test recording and the pulse width adjustment test recording is performed for a predetermined recording time, the recorded information is reproduced (SC2), and the parameter (characteristic value) in the laser light irradiation condition is detected ( SC3). Examples of this parameter include β (Asymmetry), laser beam irradiation power, and pulse phase in the case of DVD. Further, the laser power adjustment test recording is performed by changing the laser power (Wrigte PW) stepwise as shown in FIG. 3, and the pulse width adjustment test recording is similarly performed by changing the pulse width stepwise. When detecting the above parameters, if the strategy table data stored in the memory 127 can be used, it is used, and the strategy table data stored in the memory 127 cannot be used. In the case of the type of optical disk 10, a well-known auto strategy detection process is performed.

  Next, a characteristic relational expression is derived from the obtained parameters (SC4). This characteristic relational expression is the same as in the first embodiment.

  Thereafter, the optimum recording pulse condition of the laser power and the pulse width is derived using the parameters obtained from the characteristic relational expression obtained above (SC5), and the actual recording on the first recording layer 11 is performed using the optimum recording pulse condition. Is recorded (SC6).

  Next, it is determined whether or not the recording layer needs to be changed in the middle of the data recording (SC7). When the recording layer needs to be changed, the process proceeds to SC1. It is determined whether or not the processing has been completed (SC8). If the result of this determination is that recording of information has not ended, the process proceeds to SC6. If recording of information has ended, the process ends.

  On the other hand, when the information is recorded on the recording layer other than the first recording layer 11 as a result of the determination of SC1, first, the same adjustment as used for the test of the first recording layer 11 is performed by the same OPC as in the prior art. The test using only the laser power adjustment test recording using the data pattern is performed in a recording time shorter than the recording time in the first recording layer 11, the recorded information is reproduced (SC9), and the parameters ( Characteristic value) is detected (SC10). At this time, the time required for reproducing the test data is also shorter than the reproducing time in the first recording layer 11. The laser power adjustment test recording is performed by changing the laser power (Wrigte PW) step by step as shown in FIG.

  Next, a characteristic relational expression is derived from the obtained parameters (SC11). As this characteristic relational expression, for example, a characteristic relational expression representing a pulse phase correction parameter in the relationship between the laser power (Wrigte PW) and the pulse phase as shown in the graph of FIG. 7 is derived. As described above, when recording on the second recording layer 12, only the characteristic relational expression different from that of the first recording layer 11 is derived, so that the time can be shortened.

  Thereafter, using the parameters obtained from the characteristic relational expression obtained above and the characteristic relational expression obtained in the first recording layer 11, the pulse phase correction in the relationship between the pulse positional deviation and the pulse phase in the other recording layer 12 is performed. A characteristic relational expression representing a pulse phase correction parameter in relation to a parameter, that is, a positional deviation (Pluse (Topr, Tlast)) of a pulse as shown in the graph of FIG. 8 and a pulse phase is predicted (SC12). ).

  Next, the optimum recording pulse condition of the laser power and the pulse width is derived using the above characteristic relational expression (SC13). Thereafter, information is recorded on the optical disk 10 using the optimum recording pulse condition obtained (SC6).

  Next, it is determined whether or not the recording layer needs to be changed in the middle of the data recording (SC7). When the recording layer needs to be changed, the process proceeds to SC1. It is determined whether or not the processing has been completed (SC8). If the result of this determination is that recording of information has not ended, the process proceeds to SC6. If recording of information has ended, the process ends.

  According to the above embodiment, the test data is recorded on the first recording layer 11 within a predetermined recording time prior to the actual information recording, and the test data is reproduced within the predetermined reproduction time, so that the first recording is performed. Recording pulse conditions suitable for the layer 11 are derived within a predetermined test time, and the second recording layer 12 performs only the test for changing the laser power, and changes the pulse width that uses a lot of time and the test area. The test that does not perform the test and satisfies at least one of the test recording time shorter than the test recording time in the first recording layer 11 and the test reproduction time shorter than the test reproduction time in the first recording layer 11 Since the recording pulse condition is derived in time, the test time for deriving the recording pulse condition of the second recording layer 12 can be shortened, and the information The information to shorten the test time before recording can be recorded in a short period of time.

  Further, according to the optical recording apparatus 100 of the present embodiment, the optical recording method can be easily realized. Furthermore, according to the micro CPU element 125 of the present embodiment, the optical recording method can be easily realized. Further, according to the computer program of the present embodiment, the optical recording device 100 and the optical recording method can be easily realized using an arbitrary CPU.

  In the above embodiment, an example using a known multi-layer DVD as the optical disk 10 has been described. However, when an HD-DVD or a well-known Blu-ray disk is used as the optical disk 10 as in the first embodiment. The same effect can be obtained by the same processing.

  Next, a fourth embodiment of the present invention will be described.

  The apparatus configuration in the present embodiment is the same as that of the first embodiment described above, and the difference from the first embodiment is that the fourth embodiment uses a CPU 125 that stores a computer program with a different recording process. . In the following description, the same components as those in the first embodiment will be described using the same reference numerals.

  FIG. 16 is a flowchart for explaining the recording process to the recording layer in the fourth embodiment. A computer program for executing this processing is stored in advance in the memory circuit 126 of the CPU 125, and the CPU 125 performs these processing. In this embodiment, the test process for recording data on the first recording layer 11 of the optical disc 10 is substantially the same as the conventional one, but the test process for recording data on a recording layer other than the first recording layer 11 is used. Unlike the test process in the first recording layer 11, the time can be shortened.

  That is, when data is recorded on the first recording layer 11, as shown in FIG. 16, it is determined whether or not the recording is on the first recording layer 11 of the optical disc 10 (SD1). When recording information on a recording layer other than the first recording layer 11, the process proceeds to the process of SD9 described later, and when recording data on the first recording layer 11, the predetermined recording length is adjusted by the same OPC as in the prior art. The test is performed by the laser data adjustment test recording and the pulse width adjustment test recording using the data pattern, the recorded information is reproduced (SD2), and the parameter (characteristic value) in the laser light irradiation condition is detected (SD3). ). Examples of this parameter include β (Asymmetry), laser beam irradiation power, and pulse phase in the case of DVD. Further, the laser power adjustment test recording is performed by changing the laser power (Wrigte PW) stepwise as shown in FIG. 3, and the pulse width adjustment test recording is similarly performed by changing the pulse width stepwise. When detecting the above parameters, if the strategy table data stored in the memory 127 can be used, it is used, and the strategy table data stored in the memory 127 cannot be used. In the case of the type of optical disk 10, a well-known auto strategy detection process is performed.

  Next, a characteristic relational expression is derived from the obtained parameters (SD4). This characteristic relational expression is the same as in the first embodiment.

  Thereafter, the optimum recording pulse condition of the laser power and the pulse width is derived using the parameters obtained from the characteristic relational expression obtained above (SD5), and the actual recording on the first recording layer 11 is performed using the optimum recording pulse condition. Is recorded (SD6).

  Next, it is determined whether or not the recording layer needs to be changed in the middle of data recording (SD7). If the recording layer needs to be changed, the process proceeds to SD1. It is determined whether or not the processing has been completed (SD8). If the result of this determination is that recording of information has not ended, the process proceeds to SD6. If recording of information has ended, the process ends.

  On the other hand, when the information is recorded on the recording layer other than the first recording layer 11 as a result of the determination of SD1, the adjustment data pattern used for the test of the first recording layer 11 is first performed by OPC similar to the conventional one. Using a data pattern for adjustment with a recording length shorter than the recording length of the test, a test is performed only by laser power adjustment test recording, the recorded information is reproduced (SD9), and parameters (characteristic values) under laser light irradiation conditions are set. Detect (SD10). At this time, the time required for recording and reproducing the test data is shorter than the recording time and reproducing time in the first recording layer 11. The laser power adjustment test recording is performed by changing the laser power (Wrigte PW) step by step as shown in FIG.

  Next, a characteristic relational expression is derived from the obtained parameters (SD11). As this characteristic relational expression, for example, a characteristic relational expression representing a phase correction parameter in the relation between the laser power (Wrigte PW) and the pulse phase as shown in the graph of FIG. 7 is derived. As described above, when recording on the second recording layer 12, only the characteristic relational expression different from that of the first recording layer 11 is derived, so that the time can be shortened.

  Thereafter, using the parameters obtained from the characteristic relational expression obtained above and the characteristic relational expression obtained in the first recording layer 11, the pulse phase correction in the relationship between the pulse positional deviation and the pulse phase in the other recording layer 12 is performed. A characteristic relational expression representing a parameter, that is, a pulse phase correction parameter in relation to a pulse phase and a positional deviation (Pluse (Topr, Tlast)) of the pulse as shown in the graph of FIG. 8 is predicted (SD12). ).

  Next, the optimum recording pulse condition of the laser power and the pulse width is derived using the above characteristic relational expression (SD13). Thereafter, information is recorded on the optical disc 10 using the optimum recording pulse condition obtained (SD6).

  Next, it is determined whether or not the recording layer needs to be changed in the middle of data recording (SD7). If the recording layer needs to be changed, the process proceeds to SD1. It is determined whether or not the processing has been completed (SD8). If the result of this determination is that recording of information has not ended, the process proceeds to SD6. If recording of information has ended, the process ends.

  According to the above embodiment, test data within a predetermined information recording length is recorded on the first recording layer 11 prior to actual information recording, and test data within a predetermined information reproduction length is reproduced. Thus, a recording pulse condition suitable for the first recording layer 11 is derived, and in the second recording layer 12, only the test for changing the laser power is performed, and the pulse width that uses a lot of time and the test area is changed. The second test is performed so that at least one of the test recording length smaller than the test recording length in the first recording layer 11 and the test reproduction length smaller than the test reproduction length in the first recording layer 11 is satisfied. Since recording and reproducing of test data is performed on the recording layer 12 to derive the recording pulse condition, the test time for deriving the recording pulse condition of the second recording layer can be shortened. Can be, it can be recorded in a short time information by shortening the test time before recording information.

  Further, according to the optical recording apparatus 100 of the present embodiment, the optical recording method can be easily realized. Furthermore, according to the micro CPU element 125 of the present embodiment, the optical recording method can be easily realized. Further, according to the computer program of the present embodiment, the optical recording device 100 and the optical recording method can be easily realized using an arbitrary CPU.

  In the above embodiment, an example using a known multi-layer DVD as the optical disk 10 has been described. However, when an HD-DVD or a well-known Blu-ray disk is used as the optical disk 10 as in the first embodiment. The same effect can be obtained by the same processing.

  Next, a fifth embodiment of the present invention will be described.

  The apparatus configuration of this embodiment is the same as that of the first embodiment described above. The difference from the first embodiment is that the fifth embodiment uses a CPU 125 storing a computer program with different recording processing. . In the following description, the same components as those in the first embodiment will be described using the same reference numerals.

  FIG. 17 is a flowchart for explaining the recording process to the recording layer in the fifth embodiment. A computer program for executing this processing is stored in advance in the memory circuit 126 of the CPU 125, and the CPU 125 performs these processing. In this embodiment, the test process for recording data on the first recording layer 11 of the optical disc 10 is substantially the same as the conventional one, but the test process for recording data on a recording layer other than the first recording layer 11 is used. Unlike the test process in the first recording layer 11, the time can be shortened.

  That is, when data is recorded on the first recording layer 11, as shown in FIG. 17, it is determined whether or not the recording is on the first recording layer 11 of the optical disc 10 (SE1). When recording information on a recording layer other than the first recording layer 11, the process proceeds to a process of SE 9 described later. When recording data on the first recording layer 11, predetermined adjustment data is obtained by OPC as in the prior art. The test is performed by using the pattern and the laser power adjustment test recording and the pulse width adjustment test recording, the recorded information is reproduced (SE2), and the parameter (characteristic value) in the laser light irradiation condition is detected (SE3). Examples of this parameter include β (Asymmetry), laser beam irradiation power, and pulse phase in the case of DVD. Further, the laser power adjustment test recording is performed by changing the laser power (Wrigte PW) stepwise as shown in FIG. 3, and the pulse width adjustment test recording is similarly performed by changing the pulse width stepwise. When detecting the above parameters, if the strategy table data stored in the memory 127 can be used, it is used, and the strategy table data stored in the memory 127 cannot be used. In the case of the type of optical disk 10, a well-known auto strategy detection process is performed.

  Next, a characteristic relational expression is derived from the obtained parameters (SE4). This characteristic relational expression is the same as in the first embodiment.

  Thereafter, the optimum recording pulse condition of the laser power and the pulse width is derived using the parameters obtained from the characteristic relational expression obtained (SE5), and the actual recording on the first recording layer 11 is carried out using the optimum recording pulse condition. Is recorded (SE6).

  Next, it is determined whether or not the recording layer needs to be changed in the middle of data recording (SE7). When the recording layer needs to be changed, the process proceeds to SE1, and when it is not necessary, the information is recorded. It is determined whether or not the processing has been completed (SE8). If the result of this determination is that recording of information has not ended, the process proceeds to SE6. If recording of information has ended, the process ends.

  On the other hand, when the information is recorded on the recording layer other than the first recording layer 11 as a result of the determination of SE1, first, the adjustment data pattern used for the test of the first recording layer 11 by the same OPC as in the prior art. A test using only the laser power adjustment test recording is performed using a different adjustment data pattern, and the recorded information is reproduced (SE9), and parameters (characteristic values) under the laser light irradiation conditions are detected (SE10). At this time, as the adjustment data pattern used in the second recording layer 12, for example, a data pattern in which signals having a short pulse width in which a variation in pulse width is noticeable is arranged. Since a data pattern in which only signals with short pulse widths are arranged in this way is used, the time required for recording and reproducing the data pattern can be shortened compared to the test of the first recording layer 11. The laser power adjustment test recording is performed by changing the laser power (Wrigte PW) step by step as shown in FIG.

  Next, a characteristic relational expression is derived from the obtained parameters (SE11). As this characteristic relational expression, for example, a characteristic relational expression representing a pulse phase correction parameter in the relationship between the laser power (Wrigte PW) and the pulse phase as shown in the graph of FIG. 7 is derived. As described above, when recording on the second recording layer 12, only the characteristic relational expression different from that of the first recording layer 11 is derived, so that the time can be shortened.

  Thereafter, using the parameters obtained from the characteristic relational expression obtained above and the characteristic relational expression obtained in the first recording layer 11, the pulse phase correction in the relationship between the pulse positional deviation and the pulse phase in the other recording layer 12 is performed. A characteristic relational expression representing a parameter, that is, a pulse phase correction parameter in relation to a pulse phase and a positional deviation (Pluse (Topr, Tlast)) of a pulse as shown in the graph of FIG. 8 is predicted (SE12). ).

  Next, the optimum recording pulse condition of the laser power and the pulse width is derived using the above characteristic relational expression (SE13). Thereafter, information is recorded on the optical disk 10 using the optimum recording pulse condition obtained (SE6).

  Next, it is determined whether or not the recording layer needs to be changed in the middle of data recording (SE7). When the recording layer needs to be changed, the process proceeds to SE1, and when it is not necessary, the information is recorded. It is determined whether or not the processing has been completed (SE8). If the result of this determination is that recording of information has not ended, the process proceeds to SE6. If recording of information has ended, the process ends.

  According to the above-described embodiment, test data having a predetermined data pattern is recorded on the first recording layer 11 prior to actual information recording, and the test data is reproduced, and recording suitable for the first recording layer 11 is performed by the test recording. While the pulse condition is derived, only the test for changing the laser power is performed in the second recording layer 12, and the test for changing the pulse width that uses a lot of time and test area is not performed. Since test recording is performed using test data having a data pattern different from the test data in, and the recording pulse conditions of the second recording layer 12 are derived, the recording pulse conditions for deriving the recording pulse conditions of the second recording layer 12 are derived. The test time can be shortened, and the test time before information recording can be shortened to record information in a short time.

  Further, according to the optical recording apparatus 100 of the present embodiment, the optical recording method can be easily realized. Furthermore, according to the micro CPU element 125 of the present embodiment, the optical recording method can be easily realized. Further, according to the computer program of the present embodiment, the optical recording device 100 and the optical recording method can be easily realized using an arbitrary CPU.

  In the above embodiment, an example using a known multi-layer DVD as the optical disk 10 has been described. However, when an HD-DVD or a well-known Blu-ray disk is used as the optical disk 10 as in the first embodiment. The same effect can be obtained by the same processing.

  Next, a sixth embodiment of the present invention will be described.

  The apparatus configuration in the present embodiment is the same as that of the first embodiment described above. The difference from the first embodiment is that the sixth embodiment uses a CPU 125 that stores a computer program with different recording processing. . In the following description, the same components as those in the first embodiment will be described using the same reference numerals.

  FIG. 18 is a flowchart for explaining the recording process on the recording layer in the sixth embodiment. A computer program for executing this processing is stored in advance in the memory circuit 126 of the CPU 125, and the CPU 125 performs these processing. In this embodiment, the test process for recording data on the first recording layer 11 of the optical disc 10 is substantially the same as the conventional one, but the test process for recording data on a recording layer other than the first recording layer 11 is used. Unlike the test process in the first recording layer 11, the time can be shortened.

  That is, when data is recorded on the first recording layer 11, as shown in FIG. 18, it is determined whether or not the recording is on the first recording layer 11 of the optical disc 10 (SF1). When recording information on a recording layer other than the first recording layer 11, the process proceeds to SF 9, which will be described later. A test by laser power adjustment test recording and pulse width adjustment test recording is performed using the adjustment data pattern, the recorded information is reproduced (SF2), and parameters (characteristic values) in the laser light irradiation conditions are detected ( SF3). Examples of this parameter include β (Asymmetry), laser beam irradiation power, and pulse phase in the case of DVD. Further, the laser power adjustment test recording is performed by changing the laser power (Wrigte PW) stepwise as shown in FIG. 3, and the pulse width adjustment test recording is similarly performed by changing the pulse width stepwise. When detecting the above parameters, if the strategy table data stored in the memory 127 can be used, it is used, and the strategy table data stored in the memory 127 cannot be used. In the case of the type of optical disk 10, a well-known auto strategy detection process is performed.

  Next, a characteristic relational expression is derived from the obtained parameters (SF4). This characteristic relational expression is the same as in the first embodiment.

  Thereafter, the optimum recording pulse condition of the laser power and the pulse width is derived using the parameters obtained from the characteristic relational expression obtained above (SF5), and the actual recording on the first recording layer 11 is performed using the optimum recording pulse condition. Is recorded (SF6).

  Next, it is determined whether or not the recording layer needs to be changed in the middle of data recording (SF7). When the recording layer needs to be changed, the process proceeds to SF1, and when it is not necessary, the information is recorded. It is determined whether or not the process has been completed (SF8). If the result of this determination is that recording of information has not ended, the process proceeds to SF6. If recording of information has ended, the process ends.

  On the other hand, when the information is recorded on the recording layer other than the first recording layer 11 as a result of the determination of SF1, first, a plurality of types of adjustments used for the test of the first recording layer 11 are performed by the same OPC as in the past. A test using only a laser power adjustment test recording is performed using some types of adjustment data patterns of the data patterns for reproduction, and the recorded information is reproduced (SF9), and parameters (characteristic values) in laser light irradiation conditions are reproduced. ) Is detected (SF10). At this time, as the adjustment data pattern used in the second recording layer 12, only a part of the plural types of data patterns used in the first recording layer 11 is used. In comparison, the time required for recording and reproducing the data pattern can be shortened. The laser power adjustment test recording is performed by changing the laser power (Wrigte PW) step by step as shown in FIG.

  Next, a characteristic relational expression is derived from the obtained parameters (SF11). As this characteristic relational expression, for example, a characteristic relational expression representing a phase correction parameter in the relation between the laser power (Wrigte PW) and the pulse phase as shown in the graph of FIG. 7 is derived. As described above, when recording on the second recording layer 12, only the characteristic relational expression different from that of the first recording layer 11 is derived, so that the time can be shortened.

  Thereafter, using the parameters obtained from the characteristic relational expression obtained above and the characteristic relational expression obtained in the first recording layer 11, the pulse phase correction in the relationship between the pulse positional deviation and the pulse phase in the other recording layer 12 is performed. A characteristic relational expression representing a parameter, that is, a pulse phase correction parameter in relation to a pulse phase and a positional deviation (Pluse (Topr, Tlast)) of the pulse as shown in the graph of FIG. 8 is predicted (SF12). ).

  Next, the optimum recording pulse condition of the laser power and the pulse width is derived using the above characteristic relational expression (SF13). Thereafter, information is recorded on the optical disk 10 using the optimum recording pulse condition obtained (SF6).

  Next, it is determined whether or not the recording layer needs to be changed in the middle of data recording (SF7). When the recording layer needs to be changed, the process proceeds to SF1, and when it is not necessary, the information is recorded. It is determined whether or not the process has been completed (SF8). If the result of this determination is that recording of information has not ended, the process proceeds to SF6. If recording of information has ended, the process ends.

  According to the above-described embodiment, test data including a plurality of types of predetermined data patterns is recorded on the first recording layer 11 prior to actual information recording, and this is reproduced, and the test recording records the first recording layer 11 on the first recording layer 11. A suitable recording pulse condition was derived, and in the second recording layer 12, only the test for changing the laser power was performed, the test for changing the pulse width using a lot of time and the test area was not performed, Test recording is performed using some types of data patterns of the plurality of types of data patterns in the one recording layer 11 and the recording pulse conditions of the second recording layer 12 are derived. The test time for deriving the recording pulse condition can be shortened, and the test time before information recording can be shortened to record information in a short time.

  Further, according to the optical recording apparatus 100 of the present embodiment, the optical recording method can be easily realized. Furthermore, according to the micro CPU element 125 of the present embodiment, the optical recording method can be easily realized. Further, according to the computer program of the present embodiment, the optical recording device 100 and the optical recording method can be easily realized using an arbitrary CPU.

  In the above embodiment, an example using a known multi-layer DVD as the optical disk 10 has been described. However, when an HD-DVD or a well-known Blu-ray disk is used as the optical disk 10 as in the first embodiment. The same effect can be obtained by the same processing.

  Moreover, the said embodiment is only a specific example of this invention, and this invention is not limited only to the structure of the said embodiment. For example, in the above embodiment, the optical disk 10 having two recording layers 11 and 12 has been described. However, the same effect can be obtained in recording information on an optical disk having three or more recording layers. Needless to say.

  In each of the above embodiments, the optimum value of the laser beam irradiated to the other recording layer 12 is obtained in a short time with the first recording layer 11 as a reference. However, a recording layer other than the first recording layer is used as a reference. You may make it obtain | require the optimal value of the irradiation laser beam to other recording layers in a short time. In each of the above embodiments, information recording is performed in order from the first recording layer 11 at a position away from the laser light irradiation surface to the second recording layer 12 at a position close to the irradiation surface. The information recording may be performed starting with a recording layer other than the first recording layer 11.

The figure which shows the structure of the optical recording device in 1st Embodiment of this invention, and the structure of an optical disk. The flowchart explaining the recording process to the recording layer in 1st Embodiment of this invention. Diagram for explaining stepwise laser power change in laser power adjustment test recording Diagram showing the relationship between laser power and β Diagram showing the relationship between laser power and pulse phase The figure which shows the characteristic relation which expressed the pulse phase correction parameter in the relation between the positional deviation of the rise and fall of the pulse and the pulse phase The figure which shows the characteristic relation which expressed the phase correction parameter in the relation between laser power and pulse phase The figure which shows the characteristic relation which expressed the pulse phase correction parameter in the relation between the positional deviation of the rise and fall of the pulse and the pulse phase Diagram showing the relationship between laser power and asymmetry The figure which shows the characteristic relation which expressed the phase correction parameter in the relation between laser power and amplitude The figure which shows the characteristic relation which expressed the phase correction parameter in the relation between the positional deviation of the rise and fall of the pulse and the amplitude The figure which shows the characteristic relation which expressed the phase correction parameter in the relation between laser power and amplitude The figure which shows the characteristic relation which expressed the phase correction parameter in the relation between the positional deviation of the rise and fall of the pulse and the amplitude Flowchart for explaining a recording process to a recording layer in the second embodiment of the present invention Flowchart for explaining recording processing to the recording layer in the third embodiment of the present invention Flowchart for explaining recording processing to the recording layer in the fourth embodiment of the present invention Flowchart for explaining recording processing to the recording layer in the fifth embodiment of the present invention Flowchart for explaining the recording process to the recording layer in the sixth embodiment of the present invention The figure which shows the strategy table of a prior art example The figure which shows the strategy table of a prior art example

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Optical disk (recording medium), 11 ... 1st recording layer (one recording layer), 12 ... 2nd recording layer (other recording layers), 100 ... Optical recording apparatus, 110 ... Optical pick-up, 111 ... Laser diode ( LD), 112 ... photo detector (PD), 113 ... collimating lens, 114 ... objective lens, 115 ... detection lens, 116 ... beam splitter, 121 ... LD driver, 122 ... slicer, 123 ... data demodulation circuit, 124 ... characteristic value detection , 125 ... One-chip CPU element (CPU), 126 ... Memory circuit, 127 ... Memory, 128 ... Interface (I / F), 131 ... Display part, 132 ... Operation part.

Claims (7)

When an optical recording apparatus records information by irradiating a laser beam pulse onto a recording medium composed of a plurality of layers including one recording layer and another recording layer, test data is recorded in the test area of the recording layer. And reproducing to derive a recording pulse condition, and irradiating the recording medium with a laser light pulse based on the recording pulse condition to record information,
The optical recording device comprises:
Prior to the actual information recording, test data having a predetermined data pattern is recorded on one recording layer and reproduced, and a recording pulse condition suitable for the one recording layer is derived by the test recording. Steps,
Performing a second recording step of deriving a recording pulse condition of the other recording layer by performing test recording in the other recording layer using a data pattern in which only signals having a short pulse width are arranged. Optical recording method. In the test recording in the one recording layer, the laser irradiation power and the pulse phase are changed,
The optical recording method according to claim 1, wherein only the laser irradiation power is changed in the test recording in the other recording layer. When recording information by irradiating a laser beam pulse to a recording medium composed of a plurality of layers including one recording layer and another recording layer, the test data is recorded and reproduced in the test area of the recording layer. An optical recording apparatus for deriving a recording pulse condition and irradiating the recording medium with a laser light pulse based on the recording pulse condition to record information,
Prior to the actual information recording, test data having a predetermined data pattern is recorded on one recording layer and reproduced, and a recording pulse condition suitable for the one recording layer is derived by the test recording. Means,
And a second derivation means for deriving a recording pulse condition of the other recording layer by performing test recording in the other recording layer using a data pattern in which only signals having a short pulse width are arranged. An optical recording apparatus. In the test recording in the one recording layer, the laser irradiation power and the pulse phase are changed,
The optical recording apparatus according to claim 3, wherein only the laser irradiation power is changed in the test recording in the other recording layer. When recording information by irradiating a laser beam pulse to a recording medium composed of a plurality of layers including one recording layer and another recording layer, the test data is recorded and reproduced in the test area of the recording layer. A one-chip CPU element used in an optical recording apparatus for deriving a recording pulse condition and irradiating the recording medium with a laser beam pulse based on the recording pulse condition to record information,
A memory circuit in which a computer program for controlling the operation is recorded, and a test for recording and reproducing predetermined test data on one recording layer prior to actual information recording is stored in the memory circuit; A first derivation step for deriving a recording pulse condition suitable for the one recording layer based on the result of the test,
A second derivation step of performing a test in the other recording layer using a data pattern in which only signals having a short pulse width are arranged, and deriving a recording pulse condition of the other recording layer based on a result of the test. A one-chip CPU element, wherein a computer program is stored. In the test recording in the one recording layer, the laser irradiation power and the pulse phase are changed,
The one-chip CPU element according to claim 5, wherein only the laser irradiation power is changed in the test recording in the other recording layer. When recording information by irradiating a laser beam pulse to a recording medium composed of a plurality of layers including one recording layer and another recording layer, the test data is recorded and reproduced in the test area of the recording layer. A computer program for deriving a recording pulse condition and operating a CPU element used in an optical recording apparatus that records information by irradiating the recording medium with a laser light pulse based on the recording pulse condition,
A computer program comprising the processing steps according to claim 1, 2, 5 or 6 .

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