JP2003132540A - Optical disc drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disc drive that can correctly obtain the optimum recording power by reliably detecting the beginning position to record without error when making a test recording of PCA. SOLUTION: When detecting the beginning position 13 to make a test recording, amplitude change B is calculated for the reproduced signals between adjacent frames in step S111 and step S112. The beginning position 13 is found from the position where the amplitude change B is the predetermined B' or larger.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device, and more particularly to detection of a recording start position avoiding overwrite recording in a trial writing area and calculation of stable and optimum recording power.

[0002]

2. Description of the Related Art In a conventional optical disc apparatus, when recording on a data area of a recordable optical disc, first, a process for obtaining an optimum recording power on the optical disc is required before recording on the data area. Trial writing area (hereinafter “PCA (Power Calibrat
ion area) ". ). PCA above
Is divided into two areas, and a test writing recording area (hereinafter referred to as “Test Area”).
And a trial writing frequency recording area (hereinafter, referred to as “count area”).

The process for obtaining the optimum recording power is to detect the reproduction signal located on the innermost side in the test area, and then perform a predetermined number of test writing frames (1 frame = corresponding to 1/75 second) from the detection position. The front position is set as the recording start position in the trial writing recording to be performed from now on, and the trial writing recording of a predetermined number of trial writing frames is performed while the recording power is changed step by frame from the recording starting position. It should be noted that the predetermined number of trial writing frames referred to here is a unique value provided for each optical disk device of each company. Then, in the test area, the area in which the trial write recording has been performed is reproduced, the optimum recording power is calculated from the reproduction signal for each frame (a process for obtaining the optimum recording power), and then the calculated optimum recording is performed. Data is recorded in the count area and the data area with power.

The operation of recording data in the data area of the conventional recordable optical disk in the optical disk device will be described below with reference to FIGS. 20 to 25. First,
FIG. 20 is a diagram showing an example of the configuration of the optical disc device. When the optical disc 1 is inserted into the optical disc device, the CPU 2 issues a command to the laser light irradiation circuit 3 to change the laser power of the pickup 4 to the reproduction power. Then, the rotation control circuit 5 is commanded to rotate the motor 6 to spin up the optical disc 1. Also, CP
By issuing a command to the pickup drive circuit 7, U2
The pickup 4 seeks to each area of the optical disc 1. The reproduction signal generation circuit 8 generates a reproduction signal from the voltage signal input from the pickup 4 during reproduction of the recording area.
The center detection circuit 9 detects each signal level of the peak level, the bottom level, and the center level, which are the maximum value, the minimum value, and the average value of the reproduction signal. Then, the CPU 2 calculates the degree of modulation from each of the signal levels, calculates the optimum recording power from the degree of modulation, and determines whether the corresponding area of the optical disc 1 is the recording area from the amplitude value of the reproduction signal. It is determined whether or not it is an unrecorded area. Further, the EFM / encode / decode circuit 10 is
The data conversion process is performed when reading the information recorded on the optical disc 1 and the data conversion process is performed when writing the information to be recorded on the optical disc 1.

FIG. 21 shows the recording power (FIG. 21 (a)) in the optical disk device having the above-described structure when the 15-frame trial write recording is performed while gradually increasing the laser power. 21 shows the relationship among the amplitude value (FIG. 21 (b)), the center level (FIG. 21 (c)), and the modulation degree (FIG. 21 (d)) of the reproduction signal generated on the recording surface of No. 1, As shown in FIG. 21, when the recording power of the optical disk device is gradually increased, the amplitude value and the modulation degree of the reproduction signal gradually increase, and the center level of the reproduction signal gradually decreases.

Next, a conventional recording start position detection processing operation in the trial write recording of the optical disc apparatus will be described with reference to FIGS. 23 and 24 in accordance with the flowchart of FIG. FIG. 22 is a flowchart showing a conventional recording start position detection process in the trial write recording of the optical disc apparatus, and FIG.
FIG. 24 is a diagram showing an example of a disc format in the vicinity of CA, and FIG. 24 is a diagram showing in detail a previous trial write recording portion (F portion in FIG. 23) in the PCA test area in the optical disc 1. Then, the last trial writing record,
It is assumed that 15 frames are recorded while gradually increasing the laser power. Further, FIG. 25 is a diagram showing the difference in the detected recording start position when the recording start position is detected from the reproduction signal of the same recording area in the two optical disk devices.

In the conventional optical disc apparatus, first, in step S2201, with the optical disc 1 inserted,
When a WRITE command is issued from the host computer (not shown), in step S2202, the CPU
Reference numeral 2 controls the pickup driving circuit 7 to cause the pickup 4 to seek the count area of the optical disc 1 and start recording of the previous trial write recording expected from the number of recorded frames in the count area of the optical disc 1. The position 11 is calculated. Then, in step S2203, the pickup 4 is made to seek to the recording start preliminary position 12 that is before the recording start position 11 of the previous trial writing recording, and is reproduced from the recording start preliminary position 12 (Fig. 24). In step S2204, the reproduction signal generation circuit 8 detects the reproduction signal for each frame and calculates the amplitude value A of the reproduction signal. In steps S2205 and S2206, the amplitude value A is set to a predetermined value. The previous recording start position 11 which is A'or more is detected. Then, in step S2207, the recording start position 13 in the trial writing recording to be performed is calculated from the recording start position 11 in the previous trial writing recording, and the pickup 4 seeks to the recording start position 13 to be performed (FIG. 24). In step S2208, trial write recording is started from the recording start position 13 by performing a predetermined number of frames while irradiating different recording powers in a stepwise manner. The recording start position 13 here
Is (recording start position 13) = (previous recording start position 11) −
It is calculated from (predetermined number of trial writing frames).

[0008]

In the above-described method of detecting the previous recording start position 11 in the conventional optical disk apparatus, it is determined whether the corresponding area of the optical disk 1 is a recorded area or an unrecorded area. In addition, a threshold value A'is provided for the amplitude value of the reproduced signal, and when the detected amplitude value A of the reproduced signal is equal to or more than the threshold value A ', it is determined that the corresponding area is a recording area, If not, the previous recording start position 11 is detected by determining the unrecorded area. However, in such a detection method, when the previous recording start position 11 to be detected is an area recorded with a small recording power, the amplitude value of the reproduction signal is calculated to be small, and in the optical disc device shown in FIG. ),
It suffices if the amplitude value A is larger than the threshold value A ′ and the recorded area and the unrecorded area are normally judged, and the previous recording start position 11 can be detected, but as shown in FIG. A is smaller than the threshold value A ′, the original previous recording start position 11 is erroneously determined as an unrecorded area, and the previously determined recording start position 11 is erroneously determined.
Sometimes 1'is detected. Then, similar to the conventional method, if the recording start position 13 to be performed is calculated from the erroneously determined recording start position 11 ′ and the trial writing recording is performed, the previous trial writing area is overwritten. As a result, the optimum recording power calculated from the reproduction signal of the area overwritten and recorded is not the original optimum recording power, and if the data area is recorded with that recording power, the recording quality is poor and reproduction is not possible. There was a problem of creating a disc.

The present invention has been made to solve such a problem, and stably detects the recording start position in trial writing recording without erroneous detection, and an optimum recording power can be accurately obtained. An object is to provide an optical disk device.

[0010]

In order to solve the above-mentioned problems, the optical disk device according to the first aspect of the present invention uses a laser on an optical disk capable of recording information and provided with a trial writing area. A laser light irradiating means including a pickup for irradiating light, the recording power of which is adjustable, and the recording power in the trial writing area is adjusted stepwise to reproduce the trial writing and recorded area. By determining the reproduction signal detecting means for detecting and the amplitude value of the reproduction signal, it is determined whether the area is a recording area in which pits exist on the recording surface of the optical disc or an unrecorded area in which no pits exist. Area detection means for detecting the position of the determined area, modulation degree calculation means for calculating the modulation degree of the reproduction signal, and optimum recording power is calculated from the modulation degree. An optical disk device comprising an appropriate power calculating means, wherein the recording start position of the trial writing recording to be performed in the trial writing area, which is detected when the optimum recording power is obtained, is the reproduction signal detecting means. In the trial writing area, the reproduction signal in the trial writing recording immediately before the trial writing recording to be performed from now on is reproduced and detected, and the area detecting means reproduces the reproduction signal in the trial writing recording immediately before. The amplitude value of the signal is calculated for each step, and is calculated from the position where the amount of change in the amplitude value between adjacent steps is equal to or greater than a predetermined value.

An optical disk device according to a second aspect of the present invention is the optical disk device according to the first aspect,
The recording start position of the trial writing recording to be performed in the trial writing area, which is detected when the optimum recording power is obtained, is the reproduction signal detecting means, and the recording start position of the previous one in the trial writing recording area. At the time of reproducing the trial writing record, the position where the reproduction signal is detected for the first time is obtained by the area detection means, and the position where the reproduction signal is detected for the first time and the amount of change in the amplitude value are a predetermined value. It is calculated from the positional relationship with the above positions.

An optical disk device according to a third aspect of the present invention is the optical disk device according to the second aspect.
The recording start position of the trial write recording to be performed from now on is the previous trial in the trial writing area from the positional relationship between the position where the amount of change in the amplitude value becomes a predetermined value or more and the position where the reproduction signal is detected for the first time. The writing / recording is performed by adjusting the recording power from a large recording power to a small recording power in a stepwise manner, or by performing the trial writing recording by adjusting the recording power from a small recording power to a large recording power in a stepwise manner. It is determined whether or not there is, and the calculation is performed by a calculation method according to the determination result.

Further, in the optical disk device according to the fourth aspect of the present invention, the recording power is adjusted, including an optical disk which is capable of recording information and which has a trial writing area and which includes a pickup for irradiating a laser beam. A possible laser light irradiating means, a reproduction signal detecting means for detecting the reproduction signal by reproducing the area recorded in the trial writing by adjusting the recording power in stages in the trial writing area, An area for calculating the amplitude value to determine whether the area is a recording area in which pits exist on the recording surface of the optical disc or an unrecorded area in which no pits exist, and the position of the determined area is detected. An optical disc provided with a detection means, a modulation degree calculation means for calculating the modulation degree of the reproduction signal, and an optimum power calculation means for calculating an optimum recording power from the modulation degree. In a trial writing recording by irradiating the trial writing area with different recording powers, which is performed when obtaining the optimum recording power, the recording start position of the trial writing recording is changed. The position information is recorded by trial writing as recording information.

An optical disk device according to a fifth aspect of the present invention is the optical disk device according to the fourth aspect.
The recording start position of the trial writing recording to be performed in the trial writing area, which is detected when obtaining the optimum recording power, is the trial writing recording to be performed in the trial writing area in the trial writing area by the reproduction signal detecting means. It is calculated from the position information of the recording start position recorded in the preceding trial writing record read when the preceding trial writing record is reproduced.

Further, in the optical disk device according to a sixth aspect of the present invention, the recording power is adjusted, including a pickup for irradiating a laser beam on an optical disk capable of recording information and provided with a trial writing area. A possible laser light irradiating means, a reproduction signal detecting means for detecting the reproduction signal by reproducing the area recorded in the trial writing by adjusting the recording power in stages in the trial writing area, An area for calculating the amplitude value to determine whether the area is a recording area in which pits exist on the recording surface of the optical disc or an unrecorded area in which no pits exist, and the position of the determined area is detected. An optical disc provided with a detection means, a modulation degree calculation means for calculating the modulation degree of the reproduction signal, and an optimum power calculation means for calculating an optimum recording power from the modulation degree. When the optimum recording power is obtained, the trial writing recording performed in the trial writing area is performed by a predetermined number of steps while irradiating the trial writing area with different recording powers stepwise. After recording, when the optimum recording power is calculated from the test-write recorded area by the reproduction signal detecting means and the modulation degree calculating means, the center level which is the average value of the reproduction signal is stepped. It is calculated for each step, and when the amount of change in the center level between adjacent steps is equal to or larger than a predetermined value, the trial write recording is performed again.

An optical disk device according to a seventh aspect of the present invention is the optical disk device according to the sixth aspect.
The test writing recording performed in the test writing area when determining the optimum recording power is performed in the test writing area.
After performing the trial writing recording of a predetermined number of steps while irradiating the recording power different in stages, the reproduction signal detecting means,
And when calculating the optimum recording power from the trial-written and recorded area by the modulation degree calculating means, the modulation degree of the reproduction signal is calculated for each step, and the change amount of the modulation degree between adjacent steps is calculated. If is greater than or equal to a predetermined value, the trial writing recording is performed again.

Further, an optical disk device according to an eighth aspect of the present invention is the optical disk device according to the sixth or seventh aspect, in which the trial writing area is irradiated with the stepwise different recording powers. When performing trial writing recording of the number of steps, the above-mentioned stepwise different recording power actually irradiated is monitored.

The optical disk device according to a ninth aspect of the present invention includes a pickup for irradiating a laser beam onto an optical disk capable of recording information and provided with a trial writing area, and adjusting the recording power. A possible laser light irradiating means, a reproduction signal detecting means for detecting the reproduction signal by reproducing the area recorded in the trial writing by adjusting the recording power in stages in the trial writing area, An area for calculating the amplitude value to determine whether the area is a recording area in which pits exist on the recording surface of the optical disc or an unrecorded area in which no pits exist, and the position of the determined area is detected. An optical disc provided with a detection means, a modulation degree calculation means for calculating the modulation degree of the reproduction signal, and an optimum power calculation means for calculating an optimum recording power from the modulation degree. When the optimum recording power is obtained, the trial writing recording performed in the trial writing area is performed by a predetermined number of steps while irradiating the trial writing area with different recording powers stepwise. After recording, the pickup is moved to a predetermined position, the reproduction signal detecting means and the area detecting means calculate a reproduction signal from the predetermined position for each step, and a change in amplitude value between adjacent steps. If the amount is less than or equal to the predetermined value, the trial writing recording is performed again.

Further, an optical disk device according to a tenth aspect of the present invention is the optical disk device according to any one of the sixth, seventh and ninth aspects, and is detected when the optimum recording power is obtained. The recording start position of the trial writing record to be performed again in the trial writing area is the recording start position in the trial writing recording when the trial writing recording is performed in the trial writing area. It is calculated from the recording start position.

The optical disk device according to claim 11 of the present invention is the optical disk device according to any one of claim 1, claim 4, claim 6, claim 7, and claim 9, When detecting the recording start position of the above-mentioned trial writing recording in the writing area, according to the number of trial writing recordings recorded in the trial writing number recording area,
The expected position, which is assumed to be the recording start position of the trial writing recording to be performed from now on, is calculated in advance, the pickup is moved to a position before the expected position, and the reproduction signal detecting means is provided.
The area detection means starts and continues the calculation of the amplitude value of the reproduction signal from the position before the planned position.

The optical disk device according to a twelfth aspect of the present invention is the optical disk device according to the eleventh aspect, wherein the reproduction signal detecting means and the area detecting means calculate the front position of the planned position. At the starting position,
When the amplitude value of the predetermined value or more is calculated, the pickup is moved further to the front side of the planned position, and the amplitude of the reproduction signal is changed from the position where the amplitude value of the calculation start position is the predetermined value or less. The calculation of the value is started and continued.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION (Embodiment 1)
Embodiment 1 of the present invention will be described with reference to FIGS. 3 and 20. In the first embodiment, in the optical disc device, a threshold value A ′ (hereinafter, “predetermined value” which is an amplitude value of a reproduction signal for determining whether the corresponding area of the optical disc 1 is a recorded area or an unrecorded area). Value A ′ ”) and a threshold value B ′ (hereinafter referred to as“ predetermined value ”) that is a variation amount of an amplitude value between adjacent frames for detecting a trial writing recording start position and a trial writing recording end position. Value B ′ ”), and a position obtained by comparing the amplitude value A of the reproduction signal with a predetermined value A ′, and a change amount B of the amplitude value between the adjacent frames and a predetermined value B. Based on the positional relationship with the position obtained by the comparison with ', the recording start position in the trial writing recording to be performed is detected.

First, the configuration of the optical disc device according to the first embodiment of the present invention is the same as that of the conventional optical disc device shown in FIG. 20, and therefore its explanation is omitted here. Next, the operation of the detection processing of the recording start position in the trial writing recording of the optical disk device according to the first embodiment will be described according to the flowchart of FIG. 1 and with reference to FIGS.

FIG. 1 is a flowchart showing the recording start position detection processing in the trial write recording of the optical disc apparatus according to the first embodiment, and FIGS. 2 and 3 are the optical disc tests according to the first embodiment. FIG. 3 is a diagram showing in detail the previous trial writing recording area in the area. FIG. 2 shows a case where the last trial writing recording is recorded for 15 frames while gradually increasing the laser power, and in FIG.
The case where the previous trial writing recording is performed for 15 frames while gradually lowering the laser power is shown.

First, in step S101, when the WRITE command is issued from the host computer (not shown) with the optical disc 1 inserted, the CPU 2 controls the pickup drive circuit 7 in step S102. Then, the pickup 4 is sought in the count area of the optical disc 1, and the recording start position 11 in the previous trial writing recording, which is expected from the number of recorded frames in the count area, is calculated. Then, in step S103, the pickup 4 is caused to seek to the recording start preliminary position 12 which is before the recording start position 11 in the previous trial writing recording (steps in FIGS. 2 and 3),
Playback is performed from the recording start preliminary position 12. Then, during reproduction (steps in FIGS. 2 and 3), step S104
Then, the reproduction signal generation circuit 8 detects the reproduction signal for each frame and calculates the amplitude value A of the reproduction signal, and in steps S105 to S108, the pickup 4 is at a position other than the recording start preliminary position 12. First, the recording area in the previous trial writing recording in which the amplitude value A becomes equal to or larger than the predetermined value A'is detected for the first time, and the current position 16 of the detected recording area is acquired, and then reproduction is continued (steps in FIGS. 2 and 3). During). If the amplitude value A of the reproduced signal is equal to or larger than the predetermined value A'at the recording start preliminary position 12, the pickup 4 is made to seek further before the recording start preliminary position 12 in step S109, and the step is performed again. The steps from S104 to S108 are performed.

Then, in step S110, a change (difference) amount B between the amplitude value A at the current position 16 and the amplitude value A immediately before the current position 16 is calculated. Then, in steps S111 and S112, the recording end position 14 in the previous trial writing recording in which the change amount B becomes equal to or more than the predetermined value B ′ is detected, and the current position 16 acquired in step S108 and the Based on the positional relationship with the recording end position 14, it is determined whether the previous trial writing recording was performed while gradually increasing the laser power or gradually lowering the laser power, and according to the last trial writing recording. Then, the recording start position 13 of the trial writing recording to be performed is calculated.

Here, as shown in FIG. 2, if the current position 16 and the recording end position 14 are different (current position 16 ≠ recording end position 14), the previous trial writing recording is performed with the laser power. It is discriminated that 15 frames have been recorded while gradually increasing (FIG. 2). In this case, the recording start position 13 is (recording start position 13) = (recording end position 14) − (2 ×
It is calculated from a predetermined number of trial writing frames).

Further, as shown in FIG. 3, the present position 1
6 is the same as the recording end position 14 (current position 1
6 = recording end position 14), it is determined that the previous trial writing recording has been recorded for 15 frames while gradually increasing the laser power (FIG. 3). In this case, the recording start position 13 is The recording start position 13) = (recording start position 11) − (predetermined number of trial writing frames).

Then, in step S113, the pickup 4 is sought at the recording start position 13 detected in step S112 (steps of FIGS. 2 and 3), and in step S114, different recording powers are applied stepwise. Meanwhile, trial writing recording of a predetermined number of frames is started.

As described above, according to the first embodiment,
As shown in FIG. 2 or FIG. 3, the optical disk device performs trial writing recording of a predetermined number of steps on the optical disk 1 while gradually increasing or gradually lowering the laser power to perform optimum recording. When calculating the recording start position 13 of the trial write recording to be performed when calculating the power, the position where the amplitude value A of the reproduction signal is equal to or larger than the predetermined value A ′ and the amount of change B of the amplitude value between adjacent frames are calculated. A position that is equal to or greater than a predetermined value B'is obtained, and if the two positions are different, a position where the amplitude value of the reproduction signal between adjacent frames changes greatly, that is, an area recorded with a large recording power and a small recording power. The recording start position 13 is calculated from the boundary position (= recording end position 14 in FIG. 2) with the recorded area. Boundary position between the recorded area and the unrecorded area in the power (= recording start position in FIG 1
Since the recording start position 13 is calculated from 1), it is possible to stably detect the recording start position 13 in the trial writing recording on the optical disc 1.
Further, as a result, it becomes possible to accurately calculate the optimum recording power for the optical disc 1.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to FIGS. 4 to 8 and 20. In the second embodiment, in the optical disc device,
A threshold value A ′ (hereinafter referred to as “predetermined value A ′”) which is an amplitude value of a reproduction signal for determining whether the corresponding area of the optical disc 1 is a recorded area or an unrecorded area is provided. When the previous trial writing recording is performed, the recording start position where the trial writing recording is started is recorded in advance in the trial writing recording area, and the amplitude value A of the reproduction signal is compared with the predetermined value A ′. By reading the recorded recording start position, the recording start position in the trial writing recording to be performed will be detected. Since the configuration of the optical disc device according to the second embodiment is the same as that of the conventional optical disc device as in the first embodiment, the description thereof will be omitted.

The operation of the trial writing recording process and the trial writing recording detection process of the trial writing recording in the second embodiment will be described below with reference to FIGS. A description will be given according to the flowchart of FIG. FIG. 4 is a flowchart showing a trial writing recording process of the optical disc device according to the second embodiment.
FIG. 6 is a diagram showing a trial writing recording area, which is performed before the trial writing recording area to be performed in the test area of the optical disc in the second embodiment.
Here, the trial writing recording is recorded for 15 frames while gradually increasing the laser power. Further, FIG. 5 is a flowchart showing a recording start position detection process of trial writing recording to be performed at the time of performing trial writing recording of the optical disk device according to the second embodiment, and FIGS.
FIG. 7 is a diagram showing in detail the previous trial writing recording area in the test area of the optical disc in the second embodiment. FIG. 7 shows that the last trial writing recording is performed for 15 frames while gradually increasing the laser power. FIG. 8 shows a case where the previous trial write recording is performed for 15 frames while gradually reducing the laser power.

First, the trial write recording process of the optical disc device according to the second embodiment will be described with reference to FIGS. 4 and 6. In step S401, the optical disc device starts recording of the pickup 4 in trial write recording. Seek to position 11, and in step S402, EFM
The recording start position 11 is set in the encode / decode circuit 10 as the recording information, and in step S403, the laser power is gradually changed, and the predetermined test area is set during the trial writing recording (during the step of FIG. 6). In the trial writing frame of (frame 20 with a dotted line portion in FIG. 6),
The recording information, that is, the position information of the recording start position 11 is written.

After the trial writing recording described above is completed,
The operation of the recording start position detection processing in the trial writing recording which will be performed next will be described with reference to FIGS. 5, 7, and 8. In step S501, with the optical disc 1 inserted, When a WRITE command is issued from the host computer (not shown), the CPU 2 controls the pickup driving circuit 7 to move the pickup 4 to the optical disc 1 in step S502.
Then, the recording start position 11 of the previous trial writing recording, which is expected from the number of frames recorded in the count area, is calculated. Then, in step S503, the pickup 4 is caused to seek to the recording start preliminary position 12 which is before the recording start position 11 in the previous trial writing recording (steps in FIGS. 7 and 8), and the recording start preliminary position 12 is set. To play from. Then, during reproduction (-1 step in FIGS. 7 and 8), in step S504, the reproduction signal generation circuit 8 detects the reproduction signal for each frame and calculates the amplitude value A of the reproduction signal, and then in step S505. And in step S506,
The recording area in the previous trial writing recording in which the amplitude value A becomes equal to or larger than the predetermined value A ′ for the first time is detected, and a certain frame (here,
The recording information (recording start position 11 in the previous trial writing recording) recorded in the frame 20) is set to EFM.
A process of reading by the encode / decode circuit 10 is performed (step -2 in FIGS. 7 and 8). Then, in step S507, when the recording information, that is, the recording start position 11 in the previous trial writing recording (corresponding to the recording start position 11 in FIG. 5) is acquired, step S5
At 07, the recording start position 13 is calculated by (recording start position 13) = (recording start position 11) − (predetermined number of trial writing frames), and the pickup 4 is moved to the recording start position 13
To seek (steps in FIGS. 6 and 7). Then, in step S509, the trial write recording of a predetermined number of frames is started from the recording start position 13 in the test area while irradiating recording power different in stages.

As described above, according to the second embodiment,
At the time of the last trial writing recording, the recording start position 11 in the last trial writing recording is written in advance in the recorded frame (section D in FIGS. 6 and 7) in the last trial writing recording as the recording information. Since the optical disc device detects the recording start position 13 in the trial writing recording to be performed in order to calculate the optimum recording power, the optical disc device has the optimum recording power in the trial writing recording in the test area. From the vicinity of the frame 20 recorded in (the section D in FIGS. 6 and 7), the recording information,
That is, the recording start position 11 in the previous trial writing recording can be read, and the recording starting position 13 in the trial writing recording to be performed can be stably detected from the recording starting position 11. Further, as a result, it becomes possible to accurately calculate the optimum recording power for the optical disc 1.

(Embodiment 3) Below, FIGS.
The third embodiment will be described with reference to FIGS. In the third embodiment, a threshold value A ′ (hereinafter, referred to as “predetermined value”, which is an amplitude value of a reproduction signal for determining whether the corresponding area of the optical disk 1 is a recorded area or an unrecorded area, in the optical disk device Value A ′ ”) and a threshold value C ′, which is the amount of change in the center level between adjacent frames, for determining whether or not overwriting is performed.
(Hereinafter, referred to as “predetermined value C ′”) is provided, and after trial writing and recording, the area is reproduced, and the change amount C of the center level of the reproduction signal between adjacent frames is equal to or larger than the predetermined value C ′. It is detected whether or not there is such a position, and the optimum recording power is calculated based on the detection result.

The configuration of the optical disc according to the third embodiment of the present invention is the same as that of the conventional optical disc device as in the case of the above-mentioned first embodiment, and the description thereof will be omitted. Hereinafter, regarding the operation of the optimum recording power calculation process in the trial write recording of the optical disk device according to the third embodiment,
This will be described with reference to the flowchart of FIG. 9 with reference to FIGS.

FIG. 9 is a flow chart showing the optimum recording power calculation processing in the optical disk device according to the third embodiment, and FIG. 10 shows details of the test area when the trial write recording is performed without overwriting. In the figure, the dotted line shows the trial writing recording area of this time performed without overwriting, and the solid line shows the previous trial writing recording area. Further, FIG. 11 is a diagram showing in detail the test area when the trial writing recording is performed by overwriting, and the dotted line portion shows the current trial writing recording area performed by overwriting. The one-dot broken line area indicates that if the trial writing record is overwritten,
The next trial writing recording area to be performed again is shown. Also,
FIG. 12 is a diagram showing a center level of a reproduction signal calculated when reproducing a test area (dotted line portion in FIG. 10) in which trial writing recording is performed without overwriting,
FIG. 13 is a diagram showing the center level of the reproduction signal calculated when reproducing the test area (dotted line portion in FIG. 11) in which the test writing recording is performed by overwriting.

Normally, as shown in FIG. 11, when the trial writing recording this time (dotted line portion) is overwritten on the previous trial writing recording area (solid line portion), the overwritten area (overwriting in FIG. 11). When the reproduction from the start position 18 to the overwrite end position 19) is performed, the center level of the overwritten area becomes small as a whole (from the overwrite start position 18 to the overwrite end in FIG. 13). Up to position 19).

Therefore, in the optical disk device according to the third embodiment, first, in step S901, the pickup 4 is made to seek to the recording start position 13 in the trial writing recording to be performed, and the steps S902 and S9 are performed.
At 03, the laser power is changed for each frame, and the trial writing recording of a predetermined number of trial writing frames is performed while acquiring the laser power actually applied for each frame (steps in FIGS. 10 and 11). . Then, in step S904, the pickup 4 is sought and reproduced at the recording start position 13 where the trial writing recording was performed previously.
During reproduction (steps in FIGS. 10 and 11), in step S905, the CPU 2, the reproduction signal generation circuit 8, and the peak / bottom center detection circuit 9 detect the reproduction signal for each frame and average the reproduction signals. In step S906, the center level change (difference) amount C between the adjacent frames is calculated while calculating the value of the center level and the degree of modulation. Then, in steps S907 and S909, the center level change amount C between the adjacent frames calculated in step S906 is calculated.
Is greater than or equal to a predetermined value C ′, and as shown in FIG. 12, the change amount C between adjacent frames is equal to or more than the predetermined value C ′.
If not, it is determined that the center level is gradually decreasing, and in this case, the test writing record of this time is
It is determined that the previous test writing recording area was performed without being overwritten (optical disk as shown in FIG. 10). Then, in step S910, the above step S90.
The optimum recording power is calculated from the modulation degree calculated in 5.
In step S911, a predetermined number of frames is recorded in the count area (1 count area is added for every 15 test recordings of the test area).

On the other hand, if the center level change amount C between the adjacent frames is equal to or greater than the predetermined value C'in step S907, in step S908.
The cause of the change in center level between adjacent frames is
It is confirmed whether or not it is due to a sudden change in the actually irradiated laser power, and if the laser power is gradually increasing, it is determined that the center level change amount C has changed significantly, and In this case, it is determined that the trial writing recording of this time is overwritten in the trial writing recording area of the previous time (optical disc as shown in FIG. 11). Then, in step S91
2, the recording start position 1 in the trial writing recording performed again
3 ′ is calculated from (recording start position 13 ′) = (recording start position 13) − (predetermined number of trial writing frames), and the pickup 4 is sought to the recording start position 13 ′ in the trial writing recording to be performed again. (Fig. 11
The process from step S902 to step S911 is performed again.

As described above, according to the third embodiment,
While performing trial writing and recording by the optical disk device, the actually irradiated laser power is acquired, the change amount C of the center level between adjacent frames is calculated and compared with a predetermined value C ′, and the change amount C is predetermined. If it does not exceed the value C ',
The optimum recording power is calculated from the degree of modulation obtained in the trial writing recording performed this time, and when the change amount C is equal to or larger than the predetermined value C ′, the change amount is not due to a large change in irradiation power. After confirming the above, the test recording is performed again, and the optimum recording power is calculated from the modulation degree obtained in the test recording performed again. It is possible to determine whether or not the test recording area has been overwritten, and when it is determined that the result is overwritten, the test recording is performed again to determine the optimum recording power for the optical disc 1. It is possible to perform stable and accurate calculation.

(Embodiment 4) Below, FIG. 14 to FIG.
The fourth embodiment will be described with reference to FIGS. In the optical disk device according to the fourth embodiment, a threshold value A ′ (hereinafter referred to as “predetermined value A”) that is an amplitude value of a reproduction signal for determining whether the corresponding area of the optical disk 1 is a recorded area or an unrecorded area ")" And a threshold value D '(hereinafter, referred to as a change amount of the modulation degree between adjacent frames for determining whether or not the data is overwritten).
This is referred to as "predetermined value D '". ) Is provided, and after trial writing and recording, the area is reproduced, and it is detected whether or not there is a position where the variation D of the modulation degree of the reproduction signal between adjacent frames is equal to or more than a predetermined value D ′. Based on the above, the optimum recording power is calculated.

Since the structure of the optical disk according to the fourth embodiment of the present invention is the same as that of the conventional optical disk device as in the case of the above-mentioned first embodiment, the description thereof will be omitted. Next, the optimum recording power calculation process in the trial write recording of the optical disk device according to the fourth embodiment will be described with reference to FIG.
16 will be described with reference to the flowchart of FIG.

FIG. 14 is a diagram showing the modulation factor of the reproduction signal calculated when reproducing the test area (dotted line portion in FIG. 10) in which the trial writing recording is performed without overwriting, and FIG. FIG. 12 is a diagram showing a modulation degree of a reproduction signal calculated when a test area (dotted line portion in FIG. 11) in which trial writing recording is performed by overwriting is reproduced. 16 is a flowchart showing the optimum recording power calculation processing in the optical disk device according to the fourth embodiment.

Normally, as shown in FIG. 11, the trial write recording of this time (dotted line portion) is overwritten in the previous trial write recording area (solid line portion), and the overwritten area (overwrite start position in FIG. 11). When reproducing from 18 to the overwrite end position 19, as shown in FIG. 15, the modulation degree of the overwritten area becomes large as a whole (from the overwrite start position 18 to the overwrite end position in FIG. 15). Between 19).

Therefore, in the optical disk device according to the fourth embodiment, first, in step S1601, the pickup 4 is sought to the recording start position 13 in the trial writing recording to be performed, and the laser power is changed in steps S1602 and S1603. While changing for each frame and acquiring the laser power that is actually applied for each frame, trial writing recording of a predetermined number of trial writing frames is performed (steps in FIGS. 10 and 11). Then, in step S1604, the pickup 4 is sought to the recording start position 13 where the trial writing recording was performed,
To play. During reproduction (steps in FIGS. 10 and 11), in step S1605, the CPU 2, the reproduction signal generation circuit 8, and the peak / bottom center detection circuit 9 detect the reproduction signal for each frame and modulate from the reproduction signal. While calculating the degree, in step S1606, the change (difference) amount D of the modulation degree between adjacent frames is calculated. Then, steps S1607 and S16
At 08, it is determined whether or not the variation amount D of the modulation degree between the adjacent frames calculated at step S1606 is equal to or more than a predetermined value D ′, and as shown in FIG. If the amount of change D is not greater than or equal to the predetermined value D ′, it is determined that the degree of modulation is gradually increasing, and in this case, the trial writing record of this time is not overwritten in the trial writing recording area of the previous time. It is determined that it has been performed (optical disc as shown in FIG. 10). Then, step S1609
In step S1605, the optimum recording power is calculated from the modulation degree calculated in step S1605, and in step S1610, the count area is set to 1 every time a predetermined number of frames (test area 15 test recordings are recorded). Add frame) is recorded.

On the other hand, in step S1607, when the amount of change D in the modulation degree between adjacent frames is equal to or greater than the predetermined value D ', in step S1611, the cause of the change in the modulation degree between adjacent frames is It is confirmed whether or not it is due to a sudden change in the recording power actually applied, and here, when the laser power is gradually increased, it is determined that the change amount D of the modulation degree has changed greatly, In this case, it is determined that the trial writing recording of this time is overwritten in the trial writing recording area of the previous time (optical disc as shown in FIG. 11). Then, in step S1612, the recording start position 13 ′ in the trial writing recording to be performed again is calculated from (recording start position 13 ′) = (recording start position 13) − (predetermined number of trial writing frames), and the pickup 4 is set. , Seek to the recording start position 13 ′ in the trial writing recording performed again (see FIG. 1).
Step 1), the steps from Step S1602 to Step S1610 are performed again.

As described above, according to the fourth embodiment,
While performing trial writing and recording by the optical disk device, the actually irradiated laser power is acquired, the variation D of the modulation degree between adjacent frames is calculated and compared with a predetermined value D ′, and the variation D is predetermined. If it does not exceed the value D ', the optimum recording power is calculated from the modulation degree obtained in the trial writing recording performed this time, and if the above-mentioned variation D exceeds the predetermined value D', the variation is the irradiation power. Is not caused by a large change, the test recording is performed again, and the optimum recording power is calculated from the modulation degree obtained by the test writing performed again. It is possible to determine whether or not the test writing record of this time by the device has been overwritten in the previous trial writing recording area, and when it is determined that the test recording has been overwritten, the test writing is performed again. By recording, an optimum recording power to the optical disk 1 in a stable manner, it is possible to accurately calculate.

(Fifth Embodiment) Below, FIGS.
The fifth embodiment will be described with reference to. In the optical disk device according to the fifth embodiment, a threshold value A ′ which is an amplitude value of a reproduction signal for determining whether the corresponding area of the optical disk 1 is a recorded area or an unrecorded area.
(Hereinafter, referred to as “predetermined value A ′”), and a threshold value B ′ (hereinafter, referred to as an amount of change in amplitude value between adjacent frames for detecting the trial write recording start position and the recording end position).
This is referred to as "predetermined value B '". ) Is provided, the amount of change in the amplitude value at the predetermined trial writing frame number backward position from the trial writing recording position after the trial writing recording is detected, and the optimum recording power is calculated based on the detection result. It is a thing.

Since the structure of the optical disk according to the fifth embodiment of the present invention is the same as that of the conventional optical disk device as in the case of the above-described first embodiment, the description thereof will be omitted. Hereinafter, the optimum recording power calculation process in the trial write recording of the optical disk device according to the fifth embodiment will be described with reference to FIG.
17 will be described with reference to the flowchart of FIG.

FIG. 17 is a flow chart showing the optimum recording power calculation processing in the optical disk device according to the fifth embodiment, and FIG. 18 shows the test area in detail when the trial write recording is performed without overwriting. In the figure, the dotted line portion shows the trial writing recording area of this time performed without overwriting, and from the recording end position 17 in the trial writing recording (= the recording start position 11 in the previous trial writing recording). The recording end position 14 in the previous trial writing recording is located behind the predetermined number of trial writing frames (section E). Further, FIG. 19 is a diagram showing in detail the test area in the case where the trial write recording is performed by overwriting.
The dotted line portion shows the trial writing area of this time in which trial writing recording is performed by overwriting, and the area after the predetermined trial writing frame number (section E) from the recording end position 17 in the trial writing recording of this time is from the previous time. The position is 14 'in the immediately preceding trial writing record, and the one-dot broken line portion shows the next trial writing recording area to be performed again when it is determined that the present trial writing record is overwritten. ing.

In the optical disc device according to the fifth embodiment, first, in step S1701, the pickup 4 seeks to the recording start position 13 in the trial writing recording,
In steps S1702 and S1703, trial writing recording with a predetermined number of trial writing frames is performed while gradually changing the laser power (steps in FIGS. 18 and 19). Then, in step S1704, the pickup 4 seeks from the recording end position 17 in the present trial writing recording to the recording end preliminary position 15 one frame before the predetermined number of trial writing frames (section E) (see FIG. 18 and step -1 in FIG. 19), 2 frames are reproduced from the recording end preliminary position 15. During reproduction (step -2 in FIGS. 18 and 19), step S1
At 705, the reproduction signal detection circuit 8 calculates the amplitude value A of the reproduction signal of two frames and the change amount B of the amplitude value A between the two frames.

In the case of an optical disc in which trial writing recording is performed without overwriting as shown in FIG. 18, a predetermined trial writing frame number (section E) is located behind the recording end position 17 in the present trial writing recording. , The recording end position 14 in the previous trial writing recording, and the change amount B at the recording end position 14 is large because it is the boundary position between the area recorded with a large recording power and the area recorded with a small recording power. It becomes a value.

Therefore, in step S1706, when the change amount B is equal to or more than the predetermined value B ', the predetermined test writing frame number (section E) behind the recording end position 17 is as follows.
It is determined that the recording end position 14 in the previous trial writing recording shown in FIG. 18 is reached, and the trial writing recording (dotted line portion) performed this time is performed without being overwritten in the previous trial writing recording area (FIG. 18). The optical disc shown in FIG.
Therefore, in step S1707, the pickup 4
Is sought to the recording start position 13 in the trial writing recording of this time (steps in FIGS. 18 and 19) and reproduced. Then, in steps S1708 and S1709, the degree of modulation for each frame of the trial-written and recorded area is calculated, and in step S1710, the above-described step S170.
Calculate the optimum recording power from the degree of modulation calculated in 8.
In step S1711, a predetermined number of frames is recorded in the count area (1 count area is added every 15 test recordings of the test area).

In the case of an optical disc in which trial writing recording is performed by overwriting as shown in FIG. 19, a predetermined number of trial writing frames (section E) from the recording end position 17 in the present trial writing recording. The rear side is not the recording end position 14 in the previous trial writing recording, but the position 14 'which is one before the previous trial writing recording, so the change amount B at the position 14' is a small value.

Therefore, in step S1706, when the change amount B is equal to or more than the predetermined value B ', the predetermined trial writing frame number (section E) behind the recording end position 17 in the present trial writing recording is shown in FIG. It is determined that it is not the recording end position 14 in the previous trial writing recording shown in (4), and it is determined that the trial writing recording performed this time is overwritten in the previous trial writing recording area (optical disc shown in FIG. 18). Then, in step S1712, the recording start position 13 ′ in the trial writing recording to be performed again is calculated from (recording start position 13 ′) = (recording start position 13) − (predetermined number of trial writing frames), and the pickup 4 is set. , Seek to the recording start position 13 ′ in the trial writing recording performed again (see FIG. 17).
The process from step S1701 to step S1711 is performed again.

As described above, according to the fifth embodiment, after the trial writing recording is performed, the amplitude value A of the predetermined trailing number of trial writing frames (section E) from the trial writing recording end position 17 is changed. When the change amount B is calculated and the change amount B is equal to or larger than the predetermined value B ′, the predetermined test writing frame number (section E) behind the recording end position 17 is as shown in FIG.
It is determined that the recording end position 14 in the previous trial writing recording is, and it is determined that the trial writing recording is performed without overwriting. On the other hand, if the change amount B is not equal to or more than the predetermined value B ′, the recording end is performed. The position after the predetermined number of trial writing frames (section E) from the position 11 is not the recording end position 14 in the previous trial writing recording of FIG. 18 (while the laser power is gradually increased, which is one before the previous trial writing recording). It is determined that the position is 14 'during the trial writing recording), it is determined that the trial writing recording of this time is overwritten on the previous trial writing recording, and if it is determined that the trial writing recording is overwritten, Since the trial writing recording is performed, a predetermined number of trial writing frames (section E) from the recording end position 17 above.
Whether or not the trial writing record performed this time is overwritten in the area where the previous trial writing recording is performed can be determined based on whether or not the last trial writing recording end position 14 exists behind. When it is determined that the data is overwritten based on the determination result, the optimum write power for the optical disc 1 can be stably and accurately calculated by performing the trial write recording again.

[0059]

As described above, according to the optical disk device of the first aspect of the present invention, a pickup for irradiating a laser beam onto an optical disk capable of recording information and provided with a trial writing area. A laser beam irradiating means capable of adjusting the recording power, and a reproduction signal detection for detecting the reproduction signal by reproducing the area recorded in the trial writing by adjusting the recording power stepwise in the trial writing area. Means and
By calculating the amplitude value of the reproduction signal, it is determined whether the area is a recording area in which pits exist on the recording surface of the optical disc or an unrecorded area in which no pits exist, and the position of the determined area An optical disk device comprising: an area detecting means for detecting; a modulation degree calculating means for calculating a modulation degree of the reproduction signal; and an optimum power calculating means for calculating an optimum recording power from the modulation degree. The recording start position of the trial writing record to be performed in the trial writing area, which is detected when obtaining the optimum recording power, is the recording start position of the trial writing recording to be performed in the trial writing area in the trial writing area by the reproduction signal detecting means. The reproduction signal in the preceding trial writing recording is reproduced and detected, and the area detecting means detects the amplitude value of the reproduction signal in the preceding trial writing recording. Since it is calculated for each step, and is calculated from the position where the amount of change in the amplitude value between adjacent steps is equal to or greater than a predetermined value, the amount of change in the amplitude value between adjacent steps in the trial writing area is calculated. The detection of the recording start position in the trial writing recording described above is performed by detecting the position of the boundary between the area recorded with a large recording power and the area recorded with a small recording power, which is the position where the amplitude value changes greatly, or the large recording power. It is possible to easily detect the recording start position from the boundary position between the area recorded in and the unrecorded area, and as a result, it is possible to stably detect the recording start position. .

According to a second aspect of the present invention, in the optical disc apparatus according to the first aspect, in the trial writing area, which is detected when the optimum recording power is obtained, The recording start position of the trial writing record to be performed from now on is that the reproduction signal is detected by the reproduction signal detecting means when the reproduction signal detecting means reproduces the preceding test writing record in the trial writing recording area. Since the position detected for the first time is obtained and calculated from the positional relationship between the position where the reproduction signal is detected for the first time and the position where the amount of change in the amplitude value is equal to or more than a predetermined value, the reproduction signal is not calculated for the first time. From the positional relationship between the position information of the position where the signal is detected and the position where the amount of change in the amplitude value of the reproduction signal between the adjacent steps is equal to or more than a predetermined value, the recording start position is set to be more stable. Can be calculated, there is an effect that.

Further, according to the optical disc apparatus of the third aspect of the present invention, the recording start position of the trial writing recording to be performed from now on is such that the change amount of the amplitude value becomes a predetermined value or more and the reproduction signal. From the positional relationship with the position detected for the first time, the previous trial writing record in the trial writing area is
Determine whether the test writing was performed by adjusting the recording power from a large recording power to a small recording power stepwise or the test writing recording was adjusted from a small recording power to a large recording power stepwise. However, since the calculation is performed by the calculation method according to the determination result, when the recording start position in the trial writing recording to be performed above is detected, the recording area recorded by the trial writing so far has a large recording power. It is possible to easily determine whether the data is recorded for each frame while gradually decreasing from the above, or is recorded for each frame while gradually increasing from a small recording power.
The effect is that detection can be performed more stably.

Further, according to the optical disk device of the fourth aspect of the present invention, the recording power including the pickup for irradiating the laser beam on the optical disk capable of recording information and having the trial writing area is provided. Adjustable laser beam irradiating means, reproduction signal detecting means for detecting the reproduction signal by reproducing the area recorded in the trial writing by adjusting the recording power stepwise in the trial writing area, and the reproducing By calculating the amplitude value of the signal, it is determined whether the area is a recording area with pits on the recording surface of the optical disc or an unrecorded area without pits, and the position of the determined area is detected. An area detecting means for performing, a modulation degree calculating means for calculating the modulation degree of the reproduction signal, and an optimum power calculating means for calculating an optimum recording power from the modulation degree are provided. In the disc device, when performing the trial writing recording by irradiating the trial writing areas with different recording powers, which is performed when obtaining the optimum recording power, the recording start position of the trial writing recording is changed. Since the position information is recorded by trial writing as the recording information, when the recording start position in the trial writing recording to be performed is detected, the position information is the recording information 1
Since the recording start position in the previous trial writing record can be read, there is an effect that the recording start position in the trial writing record to be performed can be easily detected.

According to a fifth aspect of the present invention, in the optical disc apparatus according to the fourth aspect, the optical disc apparatus in the trial writing area, which is detected when obtaining the optimum recording power, is to be detected. The recording start position of the trial writing record to be performed is read by the reproduction signal detecting unit when the trial writing record immediately before the trial writing record to be performed in the trial writing area is reproduced. Since it is calculated from the position information of the recording start position recorded in the previous trial writing record, when detecting the recording start position in the trial writing record to be performed from now on,
Since the recording start position in the immediately preceding trial writing record, which is the recording information, can be read, there is an effect that the recording start position of the trial writing record to be performed can be easily detected.

Further, according to the optical disc apparatus of the sixth aspect of the present invention, the recording power including the pickup for irradiating the laser beam to the optical disc capable of recording information and having the trial writing area is provided. Adjustable laser beam irradiating means, reproduction signal detecting means for detecting the reproduction signal by reproducing the area recorded in the trial writing by adjusting the recording power stepwise in the trial writing area, and the reproducing By calculating the amplitude value of the signal, it is determined whether the area is a recording area with pits on the recording surface of the optical disc or an unrecorded area without pits, and the position of the determined area is detected. An area detecting means for performing, a modulation degree calculating means for calculating the modulation degree of the reproduction signal, and an optimum power calculating means for calculating an optimum recording power from the modulation degree are provided. In the disk device, when the optimum recording power is obtained, the trial writing recording performed in the trial writing area is performed in a predetermined number of steps while irradiating the trial writing area with different recording powers stepwise. After recording, when the optimum recording power is calculated from the test-write recorded area by the reproduction signal detecting means and the modulation degree calculating means, the center level which is the average value of the reproduction signal is stepped. The trial writing recording is performed again when the amount of change in the center level between adjacent steps is equal to or more than a predetermined value. Therefore, the trial writing recording to be performed from now on is the previous trial writing. It is possible to surely avoid the overwrite recording in the write recording area, and as a result, it is possible to accurately calculate the optimum recording power.

According to a seventh aspect of the present invention, in the optical disc apparatus according to the sixth aspect, the trial writing recording performed in the trial writing area when obtaining the optimum recording power is performed. Is an area where the trial writing recording is performed by the reproduction signal detecting means and the modulation degree calculating means after performing the trial writing recording of a predetermined number of steps while irradiating the trial writing area with different recording powers. From the above, when calculating the optimum recording power, the degree of modulation of the reproduction signal is calculated for each step, and when the amount of change in the degree of modulation between adjacent steps is equal to or greater than a predetermined value, the trial write recording is performed again. Since it is performed, it is possible to surely avoid the above-described trial writing recording from being overwritten and recorded in the preceding trial writing recording area. Can be calculated accurately is Do recording power, there is an effect that.

According to an eighth aspect of the present invention, in the optical disc apparatus according to the sixth or seventh aspect, the trial writing area is irradiated with the recording power that is different in stages. However, when performing trial writing recording of a predetermined number of steps, the stepwise different recording power that is actually irradiated is monitored. The reason why each degree of change is more than the specified value
It is possible to confirm whether or not it is due to the sudden change in the recording power during the trial writing recording, and when there is no sudden change in the recording power during the recording, the trial writing recording is performed as described above. It can be assumed that overwriting is recorded in the previous test writing recording area, and in that case, there is an effect that the optimum recording power can be accurately calculated by performing the trial writing recording again. .

Further, according to the optical disc apparatus of the ninth aspect of the present invention, the recording power including the pickup for irradiating the laser beam to the optical disc capable of recording information and having the trial writing area is provided. Adjustable laser beam irradiating means, reproduction signal detecting means for detecting the reproduction signal by reproducing the area recorded in the trial writing by adjusting the recording power stepwise in the trial writing area, and the reproducing By calculating the amplitude value of the signal, it is determined whether the area is a recording area with pits on the recording surface of the optical disc or an unrecorded area without pits, and the position of the determined area is detected. An area detecting means for performing, a modulation degree calculating means for calculating the modulation degree of the reproduction signal, and an optimum power calculating means for calculating an optimum recording power from the modulation degree are provided. In the disk device, when the optimum recording power is obtained, the trial writing recording performed in the trial writing area is performed in a predetermined number of steps while irradiating the trial writing area with different recording powers stepwise. After recording, the pickup is moved to a predetermined position, the reproduction signal detecting means and the area detecting means calculate a reproduction signal from the predetermined position for each step, and a change in amplitude value between adjacent steps. If the amount is less than or equal to the predetermined value, the trial writing recording is performed again. Therefore, if the amount of change in the amplitude value of the reproduction signal at the predetermined position is not greater than or equal to the predetermined value, the trial writing recording is There is an effect that it is possible to assume that the previous trial writing recording area is overwritten. Also, by performing the trial write recording again, you can surely avoid the overwrite recording,
And the optimum recording power can be calculated accurately.

Next, the invention described in claim 10 of the present invention is detected when the optimum recording power is obtained in the optical disk device according to claim 6, claim 7, or claim 9. The recording start position of the trial writing recording to be performed again in the trial writing area is the recording start position in the trial writing recording when the trial writing recording is performed in the trial writing area. Since the calculation is performed from the set recording start position, when it is determined that the trial writing record is overwritten on the preceding trial writing record, the trial writing record is performed again from the acquired recording start position. There is an effect that the recording start position in the trial writing recording can be easily detected, and the overwrite recording can be surely avoided.

According to the optical disk device of the eleventh aspect of the present invention, in the optical disk device of any one of the first, fourth, sixth, seventh, and ninth aspects, When detecting the recording start position of the trial writing recording to be performed in the trial writing area, the recording start position of the trial writing recording to be performed will be determined according to the number of trial writing recordings recorded in the trial writing number recording area. An assumed planned position is calculated in advance, the pickup is moved to a position before the planned position, and the reproduction signal detection means and the area detection means make the amplitude of the reproduction signal from the front position of the planned position. Since the calculation of the value is started and continued, when the recording start position in the trial writing recording to be performed above is detected, the trial writing is performed from the trial writing recording count. It is possible to previously calculate a recording start position assumed to be the recording start position, move the pickup to a position before the recording start position, and shorten the time until the reproduction signal in the trial writing area is detected. There is an effect that you can.

Further, according to an optical disk device according to a twelfth aspect of the present invention, in the optical disk device according to the eleventh aspect, the reproduction signal detecting means and the area detecting means are provided at a position before the planned position. When an amplitude value equal to or larger than a predetermined value is calculated at a certain calculation start position, the pickup is moved further to the front side of the planned position, and from the position where the amplitude value of the calculation start position is equal to or smaller than a predetermined value. Since the calculation of the amplitude value of the reproduction signal is started and continued, the trial writing record of the predetermined number of steps from the recording start position in the trial writing recording to be performed is the previous trial writing recording. There is an effect that overwrite recording in the recording area can be surely avoided.

[Brief description of drawings]

FIG. 1 is a flowchart showing a recording start position detection process of trial writing recording according to the first embodiment of the present invention.

FIG. 2 is a diagram showing the vicinity of a test area when the last trial writing recording is performed for 15 frames while gradually increasing the laser power.

FIG. 3 is a diagram showing the vicinity of a test area when the last trial writing recording is recorded for 15 frames while gradually decreasing the laser power.

FIG. 4 is a flowchart showing a trial writing recording process according to the second embodiment of the present invention.

FIG. 5 is a flowchart showing a recording start position detection process when trial writing recording is performed in the second embodiment of the present invention.

FIG. 6 shows a test area in a case where trial writing recording performed before trial writing recording to be performed in the second embodiment of the present invention is 15 frames of trial writing recording while gradually increasing laser power. FIG.

FIG. 7 is a diagram showing the vicinity of a test area in the case where the last trial write recording is performed for 15 frames while gradually increasing the laser power in the second embodiment of the present invention.

FIG. 8 is a diagram showing the vicinity of a test area in the case where the last trial write recording is performed for 15 frames while gradually lowering the laser power in the second embodiment of the present invention.

FIG. 9 is a flowchart showing an optimum recording power calculation process in the third embodiment of the present invention.

FIG. 10 is a diagram showing the vicinity of the test area when trial writing recording (dotted line portion) to be performed in the third embodiment of the present invention is performed without overwriting.

FIG. 11 is a diagram showing the vicinity of a test area when trial writing recording (dotted line portion) to be performed in the third embodiment of the present invention is performed by overwriting.

FIG. 12 is a diagram showing a center level of a reproduction signal calculated when reproducing a test area (dotted line portion in FIG. 10) in which trial writing recording is performed without overwriting.

FIG. 13 is a diagram showing a center level of a reproduction signal calculated when a test area (dotted line portion in FIG. 11) in which test writing recording is performed by overwriting is reproduced.

FIG. 14 is a diagram showing a modulation factor of a reproduction signal calculated when reproducing a test area (dotted line portion in FIG. 10) in which trial writing recording is performed without overwriting.

FIG. 15 is a diagram showing a modulation factor of a reproduction signal calculated when a test area (dotted line portion in FIG. 11) in which test writing recording is performed by overwriting is reproduced.

FIG. 16 is a flowchart showing an optimum recording power detection process in the fourth embodiment of the invention.

FIG. 17 is a flowchart showing an optimum recording power detection process in the fifth embodiment of the present invention.

FIG. 18 is a diagram showing the vicinity of a test area in the case where trial writing recording to be performed in the fifth embodiment of the present invention is performed without overwriting.

FIG. 19 is a diagram showing the vicinity of a test area when trial writing recording to be performed in the fifth embodiment of the present invention is performed by overwriting.

FIG. 20 is a diagram showing a configuration example of a conventional optical disc device.

FIG. 21 is a diagram showing the relationship between the recording power, the amplitude value of the reproduction signal, the center level, and the modulation degree when 15-frame trial write recording is performed while gradually increasing the laser power.

FIG. 22 is a flowchart showing a conventional recording start position detection process for trial writing recording.

FIG. 23 is a diagram showing an example of a disc format near the PCA of the optical disc.

FIG. 24 is a diagram showing in detail the vicinity of the test area in the PCA of the optical disc.

FIG. 25 is a diagram showing a difference in recording start position, which is calculated when the reproduction signals of the same recording area are detected by the two optical disk devices a and b.

[Explanation of symbols]

1 Optical Disk 2 CPU 3 Laser Light Irradiation Circuit 4 Pickup 5 Rotation Control Circuit 6 Motor 7 Pickup Drive Circuit 8 Playback Signal Generation Circuit 9 Peak / Bottom / Center Detection Circuit 10 EFM / Encode / Decode Circuit 11 Recording Start in the Previous Test Writing Recording Position 11 'Recording start position 12 erroneously determined Recording start preliminary position 13 Recording start position 13' in trial writing recording to be performed again Recording start position 14 in trial writing recording performed again Recording end position 14 'in previous trial writing recording 14' Position 15 in the previous trial writing recording 16 Recording end preliminary position 16 Current position determined to be the recording area 17 Recording end position 18 in trial writing recording to be performed 18 Overwrite recording start position 19 Overwrite recording end position 20 Recording with optimum recording power Frame

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5D090 AA01 BB04 CC01 CC05 CC16                       CC18 EE02 FF33 HH01 JJ12                       KK03 LL08                 5D119 AA23 BA01 BB03 DA01 DA09                       EC09 HA19 HA45                 5D789 AA23 BA01 BB03 DA01 DA09                       EC09 HA19 HA45

Claims (12)

[Claims] 1. A laser beam irradiating means capable of adjusting recording power, including a pickup for irradiating a laser beam onto an optical disc capable of recording information and provided with a trial writing area, and an inside of the trial writing area. Of the above, the recording power is adjusted stepwise to reproduce the area where the trial writing is recorded,
Whether the area is a recorded area having pits or an unrecorded area having no pits on the recording surface of the optical disc by calculating a reproduced signal detecting means for detecting a reproduced signal and an amplitude value of the reproduced signal. Area detecting means for determining the position of the determined area, modulation degree calculating means for calculating the modulation degree of the reproduction signal, and optimum power calculating means for calculating the optimum recording power from the modulation degree. The recording start position of the trial writing recording to be performed in the trial writing area, which is detected when the optimum recording power is obtained, is the optical disc device including In the area, the reproduction signal in the trial writing recording immediately before the trial writing recording to be performed next is reproduced and detected, and the one of the reproduction signals is detected by the area detecting unit. Of the amplitude value of the reproduced signal in the trial writing recorded calculated for each step from the position where the amount of change in amplitude value between the adjacent steps is greater than or equal to a predetermined value, and calculates, optical disk apparatus characterized by. 2. The optical disk device according to claim 1, wherein the recording start position of the trial writing recording to be performed in the trial writing area, which is detected when the optimum recording power is obtained, is the reproduction signal detection. When reproducing the previous trial writing record in the trial writing recording area by means, the area detecting means obtains the position where the reproduction signal is detected for the first time, and the reproduction signal is recorded for the first time. An optical disk device characterized in that it is calculated from the positional relationship between the detected position and the position where the amount of change in the amplitude value is equal to or greater than a predetermined value. 3. The optical disk device according to claim 2, wherein the recording start position of the trial writing recording to be performed from now on is a position where the amount of change in the amplitude value becomes a predetermined value or more and a position where the reproduction signal is detected for the first time. From the positional relationship with the above, the previous trial writing recording in the trial writing area is the one for which the trial recording is performed by gradually adjusting from the large recording power to the small recording power, or the large recording is performed from the small recording power. An optical disk device characterized in that it is judged whether or not the data is adjusted for power stepwise and recorded by trial writing, and a calculation method is used according to the judgment result. 4. A laser light irradiating means capable of adjusting recording power, including a pickup for irradiating a laser light onto an optical disk capable of recording information and provided with a trial writing area, and the inside of the trial writing area. Of the above, the recording power is adjusted stepwise to reproduce the area where the trial writing is recorded,
Whether the area is a recorded area having pits or an unrecorded area having no pits on the recording surface of the optical disc by calculating a reproduced signal detecting means for detecting a reproduced signal and an amplitude value of the reproduced signal. Area detecting means for determining the position of the determined area, modulation degree calculating means for calculating the modulation degree of the reproduction signal, and optimum power calculating means for calculating the optimum recording power from the modulation degree. In an optical disc apparatus including the test writing recording in the trial writing recording by irradiating the trial writing area with different recording powers step by step when the optimum recording power is obtained. An optical disk device characterized in that position information of a recording start position is recorded by trial writing as recording information. 5. The optical disk device according to claim 4, wherein the recording start position of trial writing recording to be performed in the trial writing area, which is detected when the optimum recording power is obtained, is the reproduction signal detecting means. Then, in the trial writing area, the recording start position recorded in the trial writing record one before, which is read when the trial writing record one before the trial writing record to be performed is reproduced. An optical disc device characterized in that it is calculated from the position information of. 6. A laser beam irradiating means capable of adjusting recording power, including a pickup for irradiating a laser beam onto an optical disc capable of recording information and provided with a trial writing area, and a test writing area within the trial writing area. Of the above, the recording power is adjusted stepwise to reproduce the area where the trial writing is recorded,
Whether the area is a recorded area having pits or an unrecorded area having no pits on the recording surface of the optical disk by calculating a reproduction signal detecting means for detecting a reproduction signal and an amplitude value of the reproduction signal. Area detecting means for determining the position of the determined area, modulation degree calculating means for calculating the modulation degree of the reproduction signal, and optimum power calculating means for calculating the optimum recording power from the modulation degree. In the optical disc device having the following, when performing the optimum writing power, the trial writing recording performed in the trial writing area is performed in predetermined steps while irradiating the trial writing area with different recording powers stepwise. After performing the trial write recording for the number of times, the reproduction signal detecting means and the modulation degree calculating means perform the optimum recording pattern from the area where the trial writing is recorded. The center level, which is the average value of the reproduction signal, is calculated for each step when calculating the value, and if the change amount of the center level between adjacent steps is equal to or more than a predetermined value, the trial write recording is performed again. An optical disk device characterized by the following. 7. The optical disc apparatus according to claim 6, wherein when the optimum recording power is obtained, the trial writing recording performed in the trial writing area has different recording powers in stages in the trial writing area. After performing the trial writing recording of a predetermined number of steps while irradiating, when the optimum recording power is calculated from the trial writing recorded area by the reproduction signal detecting means and the modulation degree calculating means, the reproduction signal Is calculated for each step, and the trial write recording is performed again when the amount of change in the modulation degree between adjacent steps exceeds a predetermined value. 8. The optical disk device according to claim 6 or 7, wherein the test writing area is actually written with a predetermined number of steps while irradiating the stepwise different recording powers. An optical disk device characterized in that the irradiated recording power that is different in stages is monitored. 9. A laser beam irradiating means capable of adjusting recording power, including a pickup for irradiating a laser beam onto an optical disk capable of recording information and provided with a trial writing area, and the inside of the trial writing area. Of the above, the recording power is adjusted stepwise to reproduce the area where the trial writing is recorded,
Whether the area is a recorded area having pits or an unrecorded area having no pits on the recording surface of the optical disc by calculating a reproduced signal detecting means for detecting a reproduced signal and an amplitude value of the reproduced signal. Area detecting means for determining the position of the determined area, modulation degree calculating means for calculating the modulation degree of the reproduction signal, and optimum power calculating means for calculating the optimum recording power from the modulation degree. In the optical disc device, the trial writing recording performed in the trial writing area when obtaining the optimum recording power is performed in predetermined steps while irradiating the trial writing area with different recording powers stepwise. After making a number of trial writing records,
The pickup is moved to a predetermined position, and the reproduction signal detecting means and the area detecting means calculate the reproduction signal from the predetermined position for each step, and the change amount of the amplitude value between the adjacent steps is equal to or less than the predetermined value. In some cases, the trial write recording is performed again, and the optical disk device. 10. The method according to claim 6, claim 7, or claim 9.
In the optical disc device described in any one of 1, the recording start position of the trial writing recording to be performed again in the trial writing area, which is detected when obtaining the optimum recording power, is An optical disk device, wherein a recording start position in the trial writing recording is recorded in advance, and the recording start position is calculated from the acquired recording start position. 11. The optical disk device according to claim 1, claim 4, claim 6, claim 7, or claim 9, wherein recording of the trial writing record to be performed in the trial writing area is performed. At the time of detecting the start position, the planned position assumed to be the recording start position of the trial writing recording to be performed is calculated in advance in accordance with the number of times of trial writing recording recorded in the trial writing number recording area, The pickup is moved to a front position, and the reproduction signal detection unit and the area detection unit start and continue the calculation of the amplitude value of the reproduction signal from the front position of the planned position. Optical disk device. 12. The optical disk device according to claim 11, wherein the reproduction signal detecting means and the area detecting means calculate an amplitude value of a predetermined value or more at a calculation start position which is a position before the planned position. In this case, the pickup is moved further to the front of the planned position, and the calculation of the amplitude value of the reproduction signal is started and continued from the position where the amplitude value of the calculation start position is equal to or less than a predetermined value. An optical disk device characterized by the above.