JP2003091852A - Optical disk recording/reproducing device and laser power determining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk recording/reproducing device capable of enhancing recording quality by optimizing a plurality of parameters regarding the recording quality while one partition is used in an OPC operation like a conventional case in a single OPC operation. SOLUTION: A fig. 2 (a) is a cross-sectional drawing of an optical disk 1 and a recording surface of the optical disk 1 is constituted of a date area 21 and a power calibration area (abbreviated as PCA afterward) 22 for test write when an optical recording power value is calculated at an inner peripheral part. A fig 2 (b) is an enlarged cross-sectional drawing of a PCA part, constituted of a teat area 23 and a count area 24 and the test area 23 is constituted of 100 partitions. A fig. 2 (c) is an enlarged cross-sectional drawing of one partition and the respective partitions are constituted of 15 frames 25. A fig 2 (d) is the one that represents characteristic values corresponding to the respective frames.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording / reproducing apparatus and a laser power determining method, and more particularly to a test writing recording means for recording by changing a laser power stepwise in a test writing area.

[0002]

2. Description of the Related Art In write-once or rewritable optical disk recording, the drive current to be applied to the laser is floating due to the characteristics of the optical disk and the characteristics of the recording drive. Generally, before recording to the actual data area, the power calibration area for test writing in the innermost circumference of the disc: PCA (Power Calib)
test writing (hereinafter referred to as OPC write) while changing the power stepwise in the (ration area), and the recorded PCA
OPC for obtaining the optimum laser power is performed by examining the area (hereinafter referred to as OPC lead). JP-A-10
Japanese Patent Publication No. 293925 discloses a technique of determining the optimum power for recording information and improving the reliability of recording. According to this, the optical disc is rotated by the rotating means, and the test pattern is prewritten a plurality of times while the light intensity of the laser beam is modulated by the modulating means. The test pattern is held by the data holding unit, and the selection unit selects a different pattern for each prewrite. The information pre-written by the reproducing means is reproduced after the pre-writing, and the optimum power at the time of recording is determined by the determining means from the reproduced information.

[0003]

If the optimum power is detected and the information is recorded as described above, the recording quality is set to the target value. However, in reality, the parameter that determines the recording quality is There are other types, such as offset of the objective lens in the focus direction and displacement in the track direction. However, the OPC in the conventional optical disk device
In the operation, only the laser power is used as a parameter, and other parameters relating to recording quality are not used, so that there is a problem in the accuracy of OPC. The present invention has been made in view of the above problems, in one OPC operation,
An object of the present invention is to provide an optical disc recording / reproducing apparatus and a laser power determining method capable of improving a recording quality by optimizing a plurality of parameters relating to recording quality while keeping one partition used during OPC operation as in the conventional case. And

[0004]

In order to solve the above problems, the present invention provides a recording / reproducing of information by controlling the rotation of a recordable information recording medium and irradiating it with a laser beam. Then, in order to determine the optimum laser power for recording on the information recording medium, an optical disc recording having a trial writing recording means for recording by changing the laser power stepwise in the trial writing area on the information recording medium In the reproducing apparatus, in the process of gradually changing the laser power, a parameter changing means for changing a parameter affecting recording quality of the information recording medium at the same time as the laser power, and a reproduction signal of the trial writing area are used. And a parameter determining means for determining a parameter that provides optimum recording power and optimum recording quality from the obtained characteristic value. The OPC is set so that the recording quality will be a target value to some extent if the optimum power is detected by only the laser power and the information is recorded, but in reality, there are other parameters that determine the recording quality. For example, there is an offset in the focus direction of the objective lens, a displacement amount in the track direction, or a displacement amount in combination thereof. However, in the OPC operation in the conventional optical disk device, only the laser power is used as a parameter, and it is not performed for other parameters relating to the recording quality, so there is a problem in the accuracy of OPC. Therefore,
A method is conceivable in which the parameter affecting the recording quality is changed at the same time as the laser power. According to this invention, in the process of gradually changing the laser power, the parameter affecting the recording quality of the information recording medium is changed at the same time as the laser power.
It is possible to determine the parameter that provides the optimum recording quality without performing the above, and it is possible to improve the accuracy of OPC. Further, the invention of claim 2 is also characterized in that the parameter determining means obtains the optimum recording power and the optimum recording quality parameter by selecting the parameter when the recording power becomes the minimum value. It is an effective means. Among the parameters obtained by the parameter determining means, the parameter closest to the target value of the characteristic value is not necessarily the optimum parameter. The reason is that it is generally desirable that the recording power be small from the viewpoint of the life of the laser, etc.
It is possible to obtain the optimum recording parameter and the optimum recording power. According to such a technical means, since the parameter when the recording power becomes the minimum value is selected, the life of the laser diode can be extended.

The invention of claim 3 is also effective in that the variable frequency of the parameter affecting the recording quality of the information recording medium is made sufficiently smaller than the variable frequency of the laser power. It is a means. The parameter that most affects the OPC is, of course, the recording laser power itself. Therefore, if the variable frequency of other parameters different from the recording power is made sufficiently smaller than the variable frequency of the recording power, the error in the relationship between the characteristic value and the recording power is reduced. According to such a technical means, the variable frequency of the parameter is made sufficiently smaller than the frequency of changing the laser power stepwise, so that it is possible to accurately determine the recording power with the highest importance of the parameter determined during OPC. It will be possible. According to the invention of claim 4, the variable frequency of a plurality of parameters affecting the recording quality of the information recording medium is sufficiently reduced as compared with the frequency of changing the laser power stepwise, and It is also an effective means of the present invention to obtain the parameters which become the optimum recording power and the optimum recording quality by combining the values. The most important parameter determined during OPC is the recording power. The parameter different from that is not limited to one kind, and there are plural kinds. In such a case, a method of effectively using a plurality of parameters without affecting the recording power is to combine them so that the variable frequency is sufficiently reduced. According to such a technical means, it is possible to change a plurality of parameters that are different from the recording power and affect the recording quality, so that it is possible to further optimize the recording quality. Further, in the invention of claim 5, it is an effective means of the present invention to use the amount of shift in the focus direction of the objective lens as the parameter affecting the recording quality of the information recording medium. As an actually variable parameter, the amount of defocus in the focus direction of the objective lens can be used. Generally, when defocusing is performed, the effective power on the board surface of the optical disc on which information is recorded changes. Therefore, by recording at the optimum defocus position, the recording power can be reduced without changing the recording quality, and it is most effective in consideration of the life of the laser. According to such a technical means, the OPC operation is performed by changing the defocus amount together with the recording power,
It is possible to optimize the recording power and determine the optimum defocus position.

Further, the invention of claim 6 is an effective means of the present invention, wherein the parameter affecting the recording quality of the information recording medium uses the amount of displacement of the objective lens in the track error direction. The amount of displacement (detrack) in the track error direction of the objective lens can be used. Generally, if detracking is performed, the recording quality will deteriorate, but in an actual device, it is better to record in a detracked state due to a control offset or an electrical circuit offset. May be. for that reason,
The recording quality can be improved by recording at the optimum detrack position. According to such a technical means, it is possible to optimize the recording power and determine the optimum detrack position by changing the detrack amount together with the recording power and performing the OPC operation. Further, in the invention of claim 7, it is an effective means of the present invention to use the displacement amount in the focus direction and the track error direction of the objective lens as the parameter affecting the recording quality of the information recording medium. The defocus amount and the detrack amount of the objective lens can be used as the actually variable parameters. According to such a technical means, it becomes possible to determine the optimum defocus position and detrack position by one OPC operation. The invention of claim 8 records and reproduces information by controlling the rotation of a recordable information recording medium and irradiating a laser beam, and determines the optimum laser power for recording on the information recording medium. In order to improve the recording power of the information recording medium, the recording quality of the information recording medium may be changed in the process of changing the laser power stepwise in a method of determining the laser power by changing the laser power stepwise in the test writing area on the information recording medium. The parameter that affects the recording power is changed at the same time as the laser power, and the parameters for the optimum recording power and the optimum recording quality are determined from the characteristic values obtained from the reproduction signal of the trial writing area. According to this invention, the same effect as that of the first aspect is achieved.

The present invention is also effective in that the optimum recording power and the optimum recording quality are obtained by selecting the parameter when the recording power has a minimum value. It is a means. According to this technical means, the same operational effect as that of claim 2 is achieved. Further, the invention of claim 10 is an effective means of the present invention, wherein the variable frequency of the parameter affecting the recording quality of the information recording medium is made sufficiently smaller than the frequency of changing the laser power stepwise. is there. According to this technical means, the same operational effect as that of claim 3 is achieved. Also,
According to an eleventh aspect of the present invention, the variable frequency of a plurality of parameters affecting the recording quality of the information recording medium is sufficiently reduced as compared with the frequency of stepwise changing of the laser power, and the values of the plurality of parameters are set. It is also an effective means of the present invention to obtain the parameters which become the optimum recording power and the optimum recording quality by combining them.
According to this technical means, the same operational effect as that of the fourth aspect is achieved. In the twelfth aspect of the present invention, it is an effective means of the present invention to use the amount of displacement of the objective lens in the focus direction as the parameter that affects the recording quality of the information recording medium. According to this technical means, the same operational effect as that of claim 5 is achieved. In the thirteenth aspect of the present invention, it is also an effective means of the present invention to use the displacement amount of the objective lens in the track error direction as the parameter that affects the recording quality of the information recording medium. According to this technical means, the same operational effect as that of claim 6 is achieved. In the fourteenth aspect of the present invention, it is also an effective means of the present invention to use the amount of displacement in the focus direction and the track error direction of the objective lens as the parameter affecting the recording quality of the information recording medium. According to this technical means, the same operational effect as that of the seventh aspect is achieved.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings. However, the constituent elements, types, combinations, shapes, relative arrangements, and the like described in this embodiment are merely explanatory examples, not the gist of limiting the scope of the present invention thereto, unless specifically stated. .. FIG. 1 is a block diagram showing the configuration of an optical disc recording / reproducing apparatus using an information storage medium according to an embodiment of the present invention. This optical disk device 100 has a structure in which a CD optical disk 1 that is driven to rotate by a spindle motor 2 and a Z disk.
A spindle motor 2 controlled by CLV (Zone Constant Linear Velocity) or the like, a motor driver 3 for driving an actuator in an optical pickup 5 not shown, and a signal for servo control to the motor driver 3. A servo circuit 4 for generating a signal, a read amplifier 6 for processing each signal from a light receiving element (not shown) in the optical pickup 5, a semiconductor laser light source for CD, an optical system such as an objective lens, and an actuator. An optical pickup 5, a laser control circuit 16 for controlling the light amount of a laser light source, an ATIP decoder 13 for taking out ATIP (Absolute Time In Pregroove) information engraved on the optical disk 1, and an accurate writing start position for data. The CD encoder 14 and the binarized RF signal are converted into EFM (Eight to Fourteen Modulatio). n)
A CD decoder 7 for modulation, a buffer RAM 10 for temporarily storing data, a buffer manager 9 for controlling the buffer RAM 10, a host interface 11 connected to the buffer RAM 10 and having an ATAPI or SCSI interface, and a CD decoder 7. D / A converter 12 which outputs an audio signal
And a CD-ROM decoder 8 for performing error correction processing,
CD that adds error correction code and interleaves-
It comprises a ROM encoder 15, a ROM 18 containing a control program and a RAM 19 as a memory, and is composed of a CPU 17 which controls all the control.

Next, an outline of the operation of the optical disk drive device according to this configuration will be described. The optical disc 1 is rotationally driven by a spindle motor 2. The spindle motor 2 is controlled by the motor driver 3 and the servo circuit 4 so that the linear velocity becomes constant. This linear velocity can be changed stepwise like ZCLV (Zone Constant Linear Velocity). The optical pickup 5 incorporates a semiconductor laser, an optical system, a focus actuator, a track actuator, a light receiving element and a position sensor (not shown), and irradiates the optical disc 1 with laser light. Also, this optical pickup 5
It is possible to move in the sledge direction by a seek motor (not shown). In these focus actuator, track actuator, and seek motor, based on the signals obtained from the light receiving element and the position sensor, the motor driver 3 and the servo circuit 4 cause the laser light spot to be positioned at a desired position on the optical disc 1. Controlled by.

Next, the read operation will be described. The reproduction signal obtained by the optical pickup 5 is amplified by the read amplifier 6 and binarized, and then input to the CD decoder 7. The input binarized data is sent to the EFM (Eight to Fourteen Modulatio) at the CD decoder 7.
n) demodulated. It should be noted that the recorded data is grouped by 8 bits and subjected to EFM modulation. In this EFM modulation, 8 bits are converted into 14 bits and 3 combined bits are added to make a total of 17 bits. In this case, the combined bits are added such that the numbers of “1” and “0” up to that point are equal on average. This is referred to as "DC component suppression", and the slice level fluctuation of the DC-cut reproduction signal is suppressed by this. Then, the demodulated data is subjected to deinterleaving and error correction processing.
Thereafter, this data is input to the CD-ROM decoder 8 and further subjected to error correction processing in order to improve the reliability of the data. The data that has been subjected to the error correction processing twice as described above is temporarily stored in the buffer RAM 10 by the buffer manager 9 and is stored as sector data in a state where it is sent to the host computer (not shown) at once through the host interface 11. Transferred. In the case of music data, the data output from the CD decoder 7 is input to the D / A converter 12 and taken out as an analog audio output signal.

In the write operation, data sent from the host computer through the host interface 11 is temporarily stored in the buffer RAM 10 by the buffer manager 9. And the buffer R
The write operation is started with a certain amount of data accumulated in the AM 10, but in this case, the laser spot must be moved to the write start position before that. This position is obtained from the wobble signal previously recorded on the optical disc 1 due to the meandering of the track. The wobble signal includes absolute time information called ATIP, and this information is used by the ATIP decoder 13
Taken out by. Also, this ATIP decoder 1
The sync signal generated by the CD encoder 3 is the CD encoder 14
Is input to the optical disc 1 to enable writing of data to an accurate position. The data in the buffer RAM 10 is stored in the CD-ROM encoder 15 or the CD encoder 1.
4, an error correction code is added and interleaving is performed, and the data is recorded on the optical disc 1 via the laser control circuit 16 and the optical pickup 5. And
The information recording / reproducing apparatus 100 determines an optimum recording power value by a power calibration process in a power calibration area of an optical disc on which information is to be recorded under the control of the CPU 17, and when recording information,
The recording operation is performed based on the optimum recording power value.

FIG. 2 is an explanatory diagram of a recording surface format of the optical disc 1 according to the first embodiment of the present invention. Figure 2
(A) is a cross-sectional view of the optical disc 1, and the recording surface of the optical disc 1 has a data area 21 and a power calibration area (hereinafter referred to as PCA) for trial writing when obtaining the optimum recording power value in the inner peripheral portion. ) 22. Figure 2
(B) is an enlarged cross-sectional view of the PCA portion, which is composed of a test area 23 and a count area 24, and the test area 23 is composed of 100 partitions. FIG. 2C is an enlarged cross-sectional view of one partition, and each partition has 15 frames 2.
It is composed of 5. FIG. 2D is a diagram showing characteristic values corresponding to each frame. General OP with reference to FIG.
The C operation will be described. One of the partitions is used in one OPC operation, and test recording is performed with at least two laser powers for 15 frames included in each of the partitions. In this example, as shown in FIG. 2C, the power is changed in 15 steps and recorded for one partition.
The recording power of each frame at that time is pw1 to pw15. Then, the test signal in each frame is reproduced, the characteristic value of this reproduced signal (hereinafter, this characteristic value is referred to as β) is set to β1 to β15, and the target value is compared, and the both coincide with each other. The laser power of is detected as the optimum power. However, there are other parameters that affect the recording quality when information is recorded on the optical disc. Therefore, as a characteristic value (β) of the reproduction signal, a parameter that affects the recording quality (this parameter is hereinafter referred to as X) is changed at the same time as the laser power during one OPC operation, and trial writing is performed to set β. By obtaining it, not only the relationship between the laser power and β but also the relationship between X and β can be measured. From this relationship, it is possible to determine the parameter X that provides the optimum recording quality.

For example, the recording power pw varied in each of the 15 frames shown in FIG. 2C so that the conventional OPC is performed.
1 to pw15 and the characteristic values β1 to β15 of FIG. 2D selected from the respective reproduced signals, the following relationship is obtained. β = F [pw] (1) Here, F [] represents a function represented by a variable in []. At this time, the optimum recording power is determined by determining pw that matches the _target characteristic value β _target . Here, while changing the recording power in each of 15 frames, for example, 2, 3, 4, 6, 7, 8, 10, 11, 1,
In the second frame, the new parameter pa is also changed and recorded similarly to the power. In other frames,
pa is the default state that has not changed, and this is p
Let a0. The values of the parameters to be changed are 2, 6, 1
0 frame is pa-1 and 3, 7 and 11 frames are p
a1, and frames 4, 10, and 12 are pa2. Then, the following relation is obtained based on the characteristic value obtained from the reproduced signal just recorded. β = F ₁ [pw] (pa = pa ₀ ) (2) (calculated from 1, 5, 9, 13, 14, and ₁₅ frames) β = F ₂ [pw] (pa = pa ₋₁ ) (3) ) (Calculated from 2, 6 and 10 frames) β = F ₃ [pw] (pa = pa ₁ ) (4) (calculated from 3, 7, 11 frames) β = F ₄ [pw] (pa = pa ₂ ) ... (5) (calculated from 4, 8 and 12 frames)

FIG. 3 is a diagram showing the relationship between the optimum power and the characteristic value according to the first embodiment of the present invention. The point of each graph represents the frame number. For example, when pa = pa1 is plotted, frames 3, 7, and 11 have this characteristic. Pw as to match the characteristic value beta _{ta rget} which is a target value at this time
Is calculated from the relationships (2) to (5), the parameter pa
The relation of the optimum recording power pw with respect to is selected as follows. Pw = F ′ ₁ [pa] (6) That is, from FIG. 3, when the values at which each graph intersects the β _target line are plotted on the optimum pa below, a to d are obtained.
You can make a normal curve of Generally, it is desirable that the recording power is small from the viewpoint of the life of the laser. Here, by finding pa satisfying the minimum pw from the above relationship (6),
The optimum recording parameter pa and the optimum recording power pw
It is possible to ask. That is, the points a and b in FIG. 3 are closest to the optimum pa, but the point a is the closest as the pa satisfying the minimum pw. In addition, these parameters are (2)-
Since the relationship of (5) is satisfied, it goes without saying that the target characteristic value β _target after recording is also satisfied. As described above, the OPC is set so that the recording quality reaches a target value to some extent if the optimum power is detected only by the laser power and information is recorded. Also exists. However, in the OPC operation in the conventional optical disk device, only the laser power is used as a parameter, and it is not performed for other parameters relating to the recording quality, so there is a problem in the accuracy of OPC. Therefore, if the parameter that affects the recording quality is changed at the same time as the laser power, it becomes possible to determine the parameter having the optimum recording quality without performing redundant OPC, and improve the accuracy of OPC. be able to. Further, the parameter obtained by the parameter determining means is not necessarily the parameter that is the closest to the target value of the characteristic value. The reason is that it is generally desirable that the recording power is small from the viewpoint of the life of the laser, etc. Therefore, it is possible to obtain the optimum recording parameter and the optimum recording power by obtaining the parameter that satisfies the minimum power. Become. As a result, the parameter when the recording power becomes the minimum value is selected, so that the life of the laser diode can be extended.

FIG. 4 is a diagram showing the relationship between the optimum power and the characteristic value according to the second embodiment of the present invention. The point of each graph represents the frame number. For example, when pa = pa1 is plotted, frames 3, 6, 9, 12, and 15 have this characteristic. While changing the recording power pw in each of 15 frames, suppose that 2, 3, 5, 6, 8, 9, 11, 12, 1,
In the 4th and 15th frames, the new parameter pa is also changed and recorded similarly to the power. In other frames, pa is the same as the default state,
This is set to pa0. The value of the parameter to be changed is pa-1 for 2, 5, 8, 11, and 14 frames,
The frames 3, 6, 9, 12, and 15 are pa1. As a result, the following relationship is selected based on the characteristic value selected from the reproduced signal just recorded. β = F ₅ [pw] (pa = pa ₀ ) (7) (calculated from 1, 4, 7, 10, 13 frames) β = F ₆ [pw] (pa = pa ₋₁ ) (8) ( Calculated from 2, 5, 8, 11, 14 frames) β = F ₇ [pw] (pa = pa ₁ ) (9) (calculated from 3, 6, 9, 12, 15 frames) Recording as described above When the variable frequency of the parameter pa different from the power is made sufficiently smaller than the variable frequency of the recording power pw, the error in the relationship between the characteristic value β and the recording power pw is reduced. That is, when the values at which the graphs in FIG. 4 intersect the β _target line are plotted in the optimum pa below,
A normal curve of c is created. In this example, point a is almost optimal pa
And the optimum pw. In this way, it is possible to accurately determine the recording power pw in which the parameter that is determined during OPC has the highest importance. As described above, the parameter that most affects the OPC is the laser power itself for recording. Therefore, if the variable frequency of other parameters different from the recording power is made sufficiently smaller than the variable frequency of the recording power, the error in the relationship between the characteristic value and the recording power is reduced. As a result, it becomes possible to accurately determine the recording power in which the parameter that is determined during OPC is most important.

FIG. 5 is a diagram showing the relationship between the optimum power and the characteristic value according to the third embodiment of the present invention. As shown in FIG. 5, the points of each graph represent frame numbers, and for example, pa = p
In a0, pb = pb0, frames 1, 2, 3, 4, 7,
If 10 and 13 are plotted, this characteristic is obtained. While changing the recording power pw in each of 15 frames, in the 5th, 6th, 11th, and 12th frames, the new parameter pa is also changed and recorded similarly to the power. In other frames, pa is the default state that has not changed, and this is set as pa0. The parameter values to be changed are pa-1 for frames 5 and 11, and 6 and 1
Two frames are pa1. Furthermore, 8, 9, 14, 15
In the second frame, a parameter pb that affects recording quality different from pa is also variably recorded. In other frames, pb is the default state that has not changed, and this is set as pb0. The variable parameter values are pb-1 for frames 8 and 14, and 9 and 15
The frame is pb1.

As a result, the following relations are obtained based on the characteristic values obtained from the reproduced signal recorded as described above. β = F ₈ [pw] (pa = pa ₀ , pb = pb ₀ ) (10) (calculated from 1, 2, 3, 4, 7, 10, ₁₃ frames) β = F ₉ [pw] (pa = pa ₋₁ , pb = pb ₀ ) (11) (calculated from 5 and 11 frames) β = F ₁₀ [pw] (pa = pa ₁ , pb = pb ₀ ) (12) (calculated from 6 and 12 frames) ) Β = F ₁₁ [pw] (pa = pa ₀ , pb = pb ₋₁ ) (13) (calculated from 8 and 14 frames) β = F ₁₂ [pw] (pa = pa ₀ , pb = pb ₁ ) (14) (calculated from 9th and 15th frames) When the pw that matches the _target characteristic value β _target at this time is obtained from the relationships (10) to (12), the relationship between the optimum recording power pw and the parameter pa is obtained. Is obtained as follows. Pw = F ′ ₂ [pa] (15) Similarly, if the relation (10), (13), (14) is obtained, the relation between the optimum recording power pw and the parameter pb is obtained as follows. Pw = F ′ ₃ [pb] (16) From the above (15) and (16), it is possible to determine the parameters pa and pb which are optimum parameters, respectively. Figure 5
By plotting the values at which each graph intersects the β _target line in the optimum pa below, normal curves a to c and d to f are created. In this example, points a and d are almost optimal pa and pb.
And the optimum pw. However, the optimum parameters pa and pb do not always satisfy the same pw. In such a case, it is possible to determine the optimum value for all the parameters, for example, by determining the priority of the parameters. As described above, the recording power has the highest importance for the parameter determined during OPC. The parameter different from that is not limited to one kind, and there are plural kinds. In such a case, a method of effectively using a plurality of parameters without affecting the recording power is to combine them so that the variable frequency is sufficiently reduced. This makes it possible to make a plurality of parameters different from the recording power, which influence the recording quality, variable, so that the recording quality can be further optimized.

The fourth embodiment of the present invention uses the amount of displacement (hereinafter, defocus) of the objective lens in the focus direction as a parameter that is actually variable. Generally, when defocusing is performed, the effective power on the board surface of the optical disc on which information is recorded changes. for that reason,
By recording at the optimum defocus position, it is possible to reduce the recording power without changing the recording quality, and it is most effective when considering the life of the laser. Therefore, by changing the defocus amount along with the recording power and performing the OPC operation, the recording power can be optimized and the optimum defocus position can be determined.
The fifth embodiment of the present invention uses the amount of displacement (hereinafter, detrack) of the objective lens in the track error direction as a parameter that is actually variable. Generally, when detracking is performed, the recording quality should be degraded, but in an actual device, it is better to record in a slightly detracked state due to a control offset or an electrical circuit offset. It can get better. Therefore, the recording quality can be improved by recording at the optimum detrack position. As a result, by changing the detrack amount together with the recording power and performing the OPC operation,
It is possible to optimize the recording power and determine the optimum detrack position. The sixth embodiment of the present invention is
The defocus amount and the detrack amount of the objective lens are used as the actually variable parameters. As a result, the optimum defocus position and detrack position are set to 1
It is possible to make a decision by performing the OPC operation once.

[0019]

As described above, according to the present invention, in the first and eighth aspects, in the process of stepwise changing the laser power, the parameter that affects the recording quality of the information recording medium is set to the laser power. Since the parameters are changed at the same time, it is possible to determine the parameter that provides the optimum recording quality without performing redundant OPC, and it is possible to improve the accuracy of OPC. According to the second and ninth aspects, since the parameter when the recording power becomes the minimum value is selected, the life of the laser diode can be extended. Claim 3, 1
When 0 is set, the variable frequency of the parameter is sufficiently less than the frequency of changing the laser power stepwise.
It is possible to accurately determine the recording power where the parameter determined at the time of C is the most important. According to the fourth and eleventh aspects, since it is possible to make a plurality of parameters different from the recording power and affecting the recording quality variable, it is possible to further optimize the recording quality. Claim 5,
12 changes the defocus amount together with the recording power to O
By operating the PC, while optimizing the recording power,
The optimum defocus position can be determined. The sixth and thirteenth aspects can optimize the recording power and determine the optimum detrack position by changing the detrack amount together with the recording power and performing the OPC operation. According to claims 7 and 14, the optimum defocus position and detrack position can be determined by one OPC operation.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an optical disc recording / reproducing apparatus using an information storage medium according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a recording surface format of the optical disc 1 according to the first embodiment of the present invention, in which (a) is the optical disc 1.
2B is an enlarged sectional view of the PCA portion, FIG. 3C is an enlarged sectional view of one partition, and FIG. 3D is a diagram showing characteristic values corresponding to each frame. .

FIG. 3 is a diagram illustrating a relationship between an optimum power and a characteristic value according to the first embodiment of this invention.

FIG. 4 is a diagram illustrating a relationship between an optimum power and a characteristic value according to the second embodiment of this invention.

FIG. 5 is a diagram showing a relationship between an optimum power and a characteristic value according to a third embodiment of the present invention.

[Explanation of symbols]

1 optical disk, 2 spindle motor, 3 motor driver, 4 servo circuit, 5 optical pickup, 6 read amplifier, 7 CD decoder, 8 CD-ROM decoder, 9 buffer manager, 10 buffer RA
M, 11 host interface, 12 D / A converter, 13 ATIP decoder, 14 CD encoder, 15 CD-ROM encoder, 16 laser control circuit

Continued front page    F-term (reference) 5D090 AA01 CC01 CC18 DD03 EE01                       HH01 JJ12 KK03                 5D118 AA16 BA01 BB03 BB05 BF06                       CD02 CD03                 5D119 AA23 BA01 BB02 BB03 DA01                       EA02 EA03 HA19 HA45 JA42                 5D789 AA23 BA01 BB02 BB03 DA01                       EA02 EA03 HA19 HA45 JA42

Claims (14)

[Claims] 1. A method for recording and reproducing information by irradiating a laser beam while controlling rotation of a recordable information recording medium to determine an optimum laser power for recording on the information recording medium, In an optical disc recording / reproducing apparatus having a trial writing recording means for recording a trial writing area on an information recording medium by changing the laser power stepwise, in the process of changing the laser power stepwise, recording of the information recording medium Parameter changing means for changing a parameter affecting quality at the same time as the laser power, and parameter determining means for deciding a parameter to be the optimum recording power and the optimum recording quality from the characteristic value obtained from the reproduction signal of the trial writing area. An optical disk recording / reproducing apparatus, further comprising: 2. The parameter determining means selects a parameter when the recording power has a minimum value,
2. The optical disk recording / reproducing apparatus according to claim 1, wherein the optimum recording power and the optimum recording quality parameters are obtained. 3. The optical disk recording / reproducing according to claim 1, wherein the variable frequency of the parameter affecting the recording quality of the information recording medium is sufficiently less than the variable frequency of the laser power. apparatus. 4. The variable frequency of a plurality of parameters affecting the recording quality of the information recording medium is sufficiently reduced as compared with the frequency of stepwise changing of the laser power, and the values of the plurality of parameters are combined. The optical disc recording / reproducing apparatus according to claim 1, wherein the parameters for obtaining the optimum recording power and the optimum recording quality are obtained in this way. 5. The optical disk recording / reproducing apparatus according to claim 1, wherein the parameter affecting the recording quality of the information recording medium uses the amount of displacement of the objective lens in the focus direction. 6. The optical disk recording / reproducing apparatus according to claim 1, wherein a parameter affecting the recording quality of the information recording medium uses a displacement amount of the objective lens in a track error direction. 7. The optical disk recording / reproducing apparatus according to claim 1, wherein the parameter affecting the recording quality of the information recording medium uses the amount of displacement of the objective lens in the focus direction and the track error direction. 8. The information recording / reproducing is performed by controlling the rotation of a recordable information recording medium and irradiating a laser beam to determine the optimum laser power for recording on the information recording medium. A method for determining a laser power in which a trial writing is performed by gradually changing a laser power in a trial writing area on an information recording medium, wherein a recording quality of the information recording medium is affected in a process of gradually changing the laser power. A laser power determining method, wherein a parameter is changed at the same time as the laser power, and a parameter having an optimum recording power and an optimum recording quality is determined from a characteristic value obtained from a reproduction signal in the trial writing area. 9. The laser power determination according to claim 8, wherein the optimum recording power and the optimum recording quality are obtained by selecting the parameter when the recording power has a minimum value. Method. 10. The laser power determination according to claim 8, wherein the variable frequency of the parameter affecting the recording quality of the information recording medium is made sufficiently smaller than the frequency of changing the laser power stepwise. Method. 11. The variable frequency of a plurality of parameters affecting the recording quality of the information recording medium is sufficiently reduced as compared with the frequency of stepwise changing of the laser power, and the values of the plurality of parameters are combined. 9. The laser power determining method according to claim 8, wherein the parameters for obtaining the optimum recording power and the optimum recording quality are obtained by the above. 12. The laser power determining method according to claim 8, wherein the parameter affecting the recording quality of the information recording medium is a displacement amount of the objective lens in the focus direction. 13. The laser power determination method according to claim 8, wherein the parameter affecting the recording quality of the information recording medium is a displacement amount of the objective lens in the track error direction. 14. The laser power determining method according to claim 8, wherein the parameter affecting the recording quality of the information recording medium is a shift amount of the objective lens in the focus direction and the track error direction.