JP3254120B2 - Optical disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a CD-R device,
The present invention relates to a data writable optical disk device such as a CD-E device.

[0002]

2. Description of the Related Art A data write type optical disk device (hereinafter, referred to as "optical disk drive")
In writing data to an optical disk in an “optical disk device”, setting an optimum recording power value of laser light (referred to as an “optimal recording power value”) can improve the recording and reproduction quality of data. Important to maintain.

Conventionally, in an optical disc apparatus, the above-described optimum recording power value is set based on a setting method in which an optimum power control (OPC) is specified as power calibration in the Orange Book Part 2. (See, for example, JP-A-7-12996
No. 1).

In this method, predetermined data is recorded in a power calibration area (PCA) of an optical disk by changing a recording power value (laser power) of a laser beam within a certain range for each step, and the data is reproduced. The peak value: A1 and the bottom value: A2 of the RF signal are detected, and β = (A1 + A2) / (A1
The recording power value when the β value obtained from -A2) is a predetermined value is set as the optimum recording power value. The predetermined value of the β value is defined as 0 to 8% in the Orange Book.

[0005]

However, in the above-described method of setting the optimum recording power value, the optimum recording power value varies depending on the use environment of the drive of the optical disk device, the type of the optical disk, and the like.

In particular, when the temperature in the drive is low or the sensitivity of the optical disk is low, even if the recording power value is changed within a certain range and predetermined data is recorded, the β value becomes low due to insufficient recording power. In some cases, recording data at an optimum recording power value requires a laser diode (LD) that outputs laser light to have a high output recording power value.

As described above, even if the optimum recording power value exceeds the maximum allowable emission power of the laser diode or is less than the limit value, if the recording power value is set to a high output, the laser diode deteriorates. There has been a problem that data cannot be recorded on an optical disk rapidly due to rapid progress.

Further, if power calibration is performed every time data recording on the optical disk is interrupted, there is a problem that power calibration takes time. Further, the power calibration area (PCA) of the optical disc is divided into a test area and a count area. The test area is an area where power calibration is performed. The count area is an area indicating that the test area has been used, and is used to search for an unused test area.

Therefore, if calibration is performed at a certain line linear speed and the optimum recording power value cannot be calculated, data is recorded in the count area at a recording power value at which recording quality cannot be compensated. In addition, the data in the count area cannot be correctly reproduced, and the power calibration is performed again in the recorded test area.
There is also a problem of overwriting.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and a first object of the present invention is to make it possible to set an optimum recording power value at the time of data recording with a recording power value which does not cause deterioration of a laser diode. I do. It is a second object of the present invention to shorten the power calibration processing of the optical disc. A third object is to prevent the power calibration from being performed again on the recorded test area.

[0011]

According to the present invention, in order to achieve the above object, an optical disk having a power calibration area is rotated at a predetermined linear velocity to record and reproduce data in a recording area of the optical disk. In the optical disc device, data is recorded in the power calibration area with a plurality of levels of recording power values,
A peak value and a bottom value of a reproduced signal when the recorded data is reproduced are detected, a β value which is a signal ratio between the detected peak value and the bottom value is obtained, and the data value is determined based on the β value. Power calibration means for setting an optimum recording power value at the time of recording, and when the β value determined by the means does not reach a predetermined allowable range, the rotational linear velocity of the optical disc is reduced by the power calibration means. And means for performing power calibration again.

The power calibration means may be a means for setting an optimum recording power value to a recording power value obtained by linear approximation of the plurality of β values and each of the recording power values. Further, it is preferable that a means is provided for recording the data of the use area of the power calibration area in the count area of the optical disc with the optimum recording power value set based on the β value that has reached the predetermined allowable range.

An optical disk apparatus according to the present invention records data in a power calibration area of an optical disk at a plurality of levels of recording power values, and detects a peak value and a bottom value of a reproduced signal when reproducing the recorded data. A β value, which is a signal ratio between the detected peak value and the bottom value, is determined, and based on the β value, an optimum recording power value at the time of recording the data is set. When the optical disk does not reach the allowable range, the rotational linear velocity of the optical disk is reduced and the power calibration is performed again. Therefore, the optimum recording power value exceeds the maximum allowable output power of the laser diode or is less than the limit value. However, it is possible to prevent the recording power value from being set to a high output.

If the optimum recording power value is set to a recording power value obtained by linear approximation of the plurality of β values and the respective recording power values, every time the recording of data on the optical disc is interrupted. The optimum recording power value can be set without performing power calibration.

Further, the optimum recording power value set based on the β value reaching the predetermined allowable range,
If the data in the use area of the power calibration area is recorded in the count area of the optical disc, the data in the count area can be correctly reproduced, and the power calibration can always be performed in an unused test area. it can.

[0016]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 2 is a diagram showing a schematic configuration of an optical disk device according to an embodiment of the present invention. This optical disc apparatus includes a spindle motor 1 for rotating an optical disc 4 at a predetermined linear rotation speed, an optical pickup 3 mounted with a laser diode (LD) to irradiate a recording area of the optical disc 4 with a laser beam L, and the optical pickup 3 3 is provided with a coarse movement motor 2 for moving the optical disc 4 in the radial direction of the optical disc 4 in cooperation with a seek motor provided therein.

A rotation control system 5 for controlling the rotation of the spindle motor 1, a coarse motor control system 6 for controlling the drive of the coarse motor 2, a pickup control system 7 for controlling the optical pickup 3, and A signal processing system 8 for transmitting and receiving a signal of data read by the pickup 3 and a signal of data to be written to a recording area of the optical disc 4, a drive controller 9 for controlling the control system and the processing system, and performing processing according to the present invention are also provided. ing.

Further, the drive controller 9 is connected to a host computer via an external interface 10 and performs processing for sending data read from the optical disk 4 to the host computer and receiving data to be written on the optical disk 4 from the host computer.

The optical disk 4 is mounted on the spindle motor 1
The optical pickup 3 is moved in the radial direction of the optical disk 4 while rotating, and the laser diode L of the optical pickup 3 irradiates the recording area on the recording surface of the optical disk 4 with the laser beam L to control data recording or reproduction. Then, setting processing of the optimum recording laser power value by the power calibration according to the present invention is performed.

In this optical disk apparatus, when data is recorded, the power calibration using the power calibration area on the optical disk according to the present invention is performed under the control of the drive controller 9 to set the optimum recording laser power value. The recording area is irradiated with a laser beam L by the optical pickup 3 at the optimum recording laser power value, and various data are recorded on the optical disc 4.

At the time of reproducing information, the recording area of the optical disk 4 is irradiated with laser light L by the optical pickup 3 at the reproduction laser power value under the control of the drive controller 9 and recorded on the recording area based on the reflected light. Read and play back the data.

That is, the drive controller 9 of the optical disk device records data at a plurality of levels of recording power values in the power calibration area of the optical disk by the optical pickup 3, and reproduces the recorded data by the signal processing system 8. The peak value and the bottom value of the reproduction signal at the time are detected, a β value which is a signal ratio between the detected peak value and the bottom value is obtained, and the optimum recording power value at the time of recording the data is determined based on the β value. Power calibration means for setting the rotation speed of the optical disk of the spindle motor 1 by the rotation control system 5 when the obtained β value does not reach the predetermined allowable range, and the power calibration is performed again. Acts as a means.

Also, it functions as a means for setting the optimum recording power value to a recording power value obtained by linear approximation of a plurality of β values and their respective recording power values. Further, the optical pickup 3 records the data of the use area of the power calibration area in the count area of the optical disk by the optimum recording power value set based on the β value that has reached the predetermined allowable range. Fulfill.

Next, the data format of the recording surface on the optical disk will be described. FIG. 3 is a diagram showing a format before data writing on a recording surface of an optical disc conforming to the Orange Book Part 2, FIG. 4 is a diagram showing a format after the data writing is completed, and FIG. 5 is a detailed format of the power calibration area. FIG.

As shown in FIG. 3, an area on the recording surface of the optical disk where data can be actually written is an information area. When data is written in the information area, the data is formatted into a power calibration area (PCA), a program memory area (PMA), a lead-in area, a program area, and a lead-out area, as shown in FIG.

The PMA is a temporary TOC information recording area at the time of intermediate recording in a state where additional recording is possible. The lead-in area and the lead-out area are areas for recording information on tracks on which data is recorded. The program area is an area for recording data.

The power calibration area is an area used when performing power calibration according to the present invention. As shown in FIG. 5, the power calibration area includes a test area for performing test writing for setting an optimum recording power value before data recording and a count area for recording data indicating a used test area. Become.

In the format example shown in FIG. 5, the test area is divided into 100 partitions.
Use one partition for power calibration. The count area is also divided into 100 partitions. Each time one partition of the test area is used, data indicating that the partition is used is recorded in the corresponding partition of the count area. This count area is used when searching for an unused partition in the test area.

In this format example, power calibration can be performed 100 times. In addition, since the start position of the 100 partition in the test area, the start position of the count area, and the start position of the PMA are searched, they are not used before and after the test area and after the count area.

Next, the processing at the time of data recording in the optical disk device will be described. FIG. 1 is a flowchart showing a process at the time of data recording in the optical disc device. This processing is performed in steps (indicated by “S” in the figure)
In step 1, the rotational linear velocity of the optical disk is set to double speed.
Calibration is performed by rotating at a double linear velocity.

In the calibration, data is recorded in the test area of the power calibration area at a plurality of levels of recording power values in consideration of variations in the sensitivity of the optical disk, wavelength fluctuations of the laser diode (LD), and the like. For example, in the case of an optical disk defined by the Orange Book, there is a variation in sensitivity of 4 to 11 mW (double speed), so that a predetermined recording power value is set at 10 different recording power values in a range of about 4 to 13 mW in consideration of wavelength fluctuation and the like. Record the data.

Thereafter, in step 2, the peak value and the bottom value of the reproduced signal when the recorded data is reproduced are detected, and the β value, which is the signal ratio between the detected peak value and the bottom value, is determined. That is, when the data recorded in the power calibration area is reproduced, the peak value: A1 and the bottom value: A2 of the RF signal are detected, and based on those values, β = (A1 + A2) / (A1-A2) is obtained. Is calculated. Then, the recording power value when the β value is a predetermined value is provisionally set as the optimum recording power value.

Then, in step 3, it is determined whether or not the β value is in the range of 0 to 8%. According to the Orange Book, the recording power value corresponding to the β value within the allowable range of 0 to 8% is the optimum recording power value.
This is for setting the recording power value closest to% to the optimum recording power value.

If the β value is within the range of 0 to 8% in the judgment in step 3, the process proceeds to step 4 to set the recording power value corresponding to the β value as the optimum recording power value, and then proceeds to step 5. The data is recorded in the program area or the like of the optical disk at the optimum recording power value, and the process ends.

However, if the recording power value corresponding to the β value that does not fall within the allowable range of 0 to 8% is set to the optimum recording power value, the value exceeds the maximum allowable emission power of the laser diode or a value less than the limit value. Even in this case, the recording power value becomes a high output, and the deterioration of the laser diode progresses rapidly, so that data cannot be recorded on the optical disc.

Therefore, if the β value does not reach the predetermined allowable range in the determination in step 3, the process proceeds to step 6 in which the optical disk is rotated by reducing the rotational linear velocity to 1 ×, and
In step 7, calibration is performed again on the other partitions in the test area of the power calibration area, and a recording power value corresponding to a β value within an allowable range of 0 to 8% is obtained. The recording power value obtained by the operation is set as the optimum recording power value, and the process proceeds to step 5 where data is recorded in the program area or the like of the optical disk with the optimum recording power value, and the process ends.

In this way, it is possible to prevent the optimum recording power value from exceeding the maximum allowable output power of the laser diode or setting the recording power value to a high output even if the optimum recording power value is less than the limit value. Can be.

If the drive controller 9 sets the optimum recording power value to a recording power value obtained by linear approximation of a plurality of β values and the respective recording power values, the power calibration process is shortened. be able to.

FIG. 6 is a diagram showing the relationship between the β value obtained by the calibration and the recording power value. The diagram shows the recording power values 6, 7, and 8 mW set as OPC in the power calibration area (PCA) of the optical disk 4 and the β values calculated from the reproduction signal of the data calibrated with the recording power values. The relationship is shown.

According to the definition of the Orange Book, the optimum recording power value should be such that the β value is within the allowable range of 0 to 8%. Therefore, the recording power value whose central value β ₀ = 4% is determined as the optimum recording power value. The value is preferably set to P ₀ . That is, A in the figure
A straight line based on the points A ₁ , A ₂ , and A ₃ is determined, and the recording power value of the point A ₄ corresponding to the center value β ₀ = 4 on the straight line is set as the optimum recording power value P ₀ .

In this manner, the optimum recording power value can be set without performing power calibration every time data recording on the optical disc is interrupted, and power calibration can be performed in a short time. .

Further, the data of the used area of the power calibration area is recorded in the count area of the optical disc by the optimum recording power value set by the drive controller 9 based on the β value reaching the predetermined allowable range. With this configuration, it is possible to prevent the power calibration from being performed again in the recorded test area, thereby preventing double writing.

FIG. 7 is a flowchart showing the processing in that case. In this process, the rotational linear velocity of the optical disk is set to double speed in step (indicated by “S” in the figure) 11,
Calibration is performed by rotating at a rotation speed twice as fast as that.

In the calibration, data is recorded in the test area of the power calibration area with a plurality of levels of recording power values in consideration of variations in the sensitivity of the optical disk, wavelength fluctuations of the laser diode (LD), and the like. For example, in the case of an optical disk defined by the Orange Book, there is a variation in sensitivity of 4 to 11 mW (2 × speed). Record the data.

Thereafter, in step 12, the peak value and the bottom value of the reproduced signal when the recorded data is reproduced are detected, and the β value which is the signal ratio between the detected peak value and the bottom value is obtained. That is, when the data recorded in the power calibration area is reproduced, the peak value: A1 and the bottom value: A2 of the RF signal are detected, and based on those values, β = (A1 + A2) / (A1-A2) is obtained. Is calculated. Then, the recording power value when the β value is a predetermined value is provisionally set as the optimum recording power value.

Then, in step 13, it is determined whether the β value is in the range of 0 to 8%. According to the Orange Book, since the recording power value corresponding to the β value within the allowable range of 0 to 8% is the optimum recording power value, the recording power value closest to 4% of the center value is determined as the optimum recording power value. It is for setting to.

If the value of .beta. Is within the range of 0 to 8% in the judgment at step 13, the routine proceeds to step 14, where the recording power value corresponding to the .beta. Value is set as the optimum recording power value, and the routine proceeds to step 15. Data indicating the used partition of the test area is recorded in the count area, and the process proceeds to step 16 to record the data in the program area or the like of the optical disk at the optimum recording power value, and the process ends.

However, if the recording power value corresponding to the β value that does not fall within the allowable range of 0 to 8% is set to the optimum recording power value, the value exceeds the maximum allowable emission power of the laser diode or becomes less than the limit value. Even in this case, the recording power value becomes a high output, and the deterioration of the laser diode progresses rapidly, so that data cannot be recorded on the optical disc.

If the value of β does not reach the predetermined allowable range in step 13, the process proceeds to step 17, in which the optical disk is rotated by reducing the rotational linear speed to 1 ×, and in step 18 the power calibration area is read. Calibration is again performed on other partitions in the test area to determine a recording power value corresponding to a β value within an allowable range of 0 to 8%, and the process proceeds to step 14 where the recording power value obtained by the 1 × speed calibration is obtained. Is set as the optimum recording power value.

Then, the process proceeds to step 15 where data indicating the used partition of the test area is recorded in the count area, and the process proceeds to step 16 where the data is recorded in the program area or the like of the optical disk at the optimum recording power value. This processing ends.

As described above, since data is recorded in the count area at a recording power value at which recording quality can be compensated,
At the time of power calibration, data in the count area can be correctly reproduced, and power calibration can always be performed in an unused test area. Therefore, it is possible to prevent the power calibration from being performed again in the recorded test area and the double writing from occurring.

[0052]

As described above, according to the optical disk apparatus of the first aspect of the present invention, the optimum recording power value at the time of data recording can be set by the recording power value that does not cause deterioration of the laser diode. . Claim 2
According to the optical disk device, the power calibration processing of the optical disk can be shortened. Furthermore, according to the optical disk device of the third aspect, it is possible to prevent the power calibration from being performed again on the recorded test area.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a process at the time of data recording in an optical disc device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a schematic configuration of an optical disk device according to an embodiment of the present invention.

FIG. 3 is a diagram showing a format before data writing on a recording surface of an optical disc conforming to Orange Book Part 2;

4 is a diagram showing a format after data writing on a recording surface of the optical disc shown in FIG. 5 is completed.

FIG. 5 is a diagram showing a detailed format of a power calibration area shown in FIG. 4;

FIG. 6 is a diagram showing a relationship between a β value obtained by calibration and a recording power value in the optical disc device shown in FIG. 1;

FIG. 7 is a flowchart showing another data recording process in the optical disc device according to the embodiment of the present invention.

[Explanation of symbols]

 1: Spindle motor 2: Coarse movement motor 3: Optical pickup 4: Optical disc 5: Rotation control system 6: Coarse movement motor control system 7: Pickup control system 8: Signal processing system 9: Drive controller 10: External interface

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B ^7/ 00-7/013 G11B 7/125

Claims (3)

(57) [Claims] 1. An optical disc apparatus for recording and reproducing data in a recording area of an optical disc by rotating an optical disc having a power calibration area at a predetermined linear velocity, wherein a plurality of levels of recording power are recorded in the power calibration area. The data is recorded by the value, the peak value and the bottom value of the reproduced signal when the recorded data is reproduced are detected, and the β value which is a signal ratio between the detected peak value and the bottom value is obtained. power calibration means for setting an optimum recording power value at the time of recording the data based on the β value, and when the β value obtained by the means does not reach a predetermined allowable range, the power calibration means Means for lowering the rotational linear velocity of the optical disc and performing power calibration again Optical disc apparatus characterized by. 2. The optical disk device according to claim 1, wherein the power calibration unit sets an optimum recording power value to a recording power value obtained by linear approximation of the plurality of β values and each of the recording power values. An optical disk device comprising means. 3. The optical disc device according to claim 1, wherein the power calibration area is used as a count area of the optical disc by an optimum recording power value set based on the β value that has reached the predetermined allowable range. An optical disc device comprising means for recording area data.