JP2004054963A - Optical disk drive and its recording power control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk drive and its recording power control method, by which the data recording power is appropriately adjustable. <P>SOLUTION: In the recording power control method of the optical disk drive for recording the data at a recording speed selected from plural kinds of recording speeds with respect to the optical disk, the 1st recording power is decided by irradiating a trial writing area of the optical disk by light beams at the 1st recording speed among the plural kinds of recording speeds, and the 2nd recording power is decided by irradiating the trial writing area by the light beams at the 2nd recording speed other than the 1st recording speed among the plural kinds of recording speeds. Then, this method is characterized in that the optimum recording power at the recording speed other than the 1st and 2nd recording speeds is decided in accordance with the decided 1st and 2nd recording powers. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical disk device that records data on an optical disk and reproduces data recorded on the optical disk. The present invention also relates to a recording power control method for controlling the irradiation power of a light beam for recording data on an optical disk.
[0002]
[Prior art]
As is well known, in recent years, optical disks capable of recording and reproducing data, such as CDs (Compact Disk) -R (Recordable) and DVDs (Digital Versatile Disk) -R, have been developed and put into practical use.
[0003]
On the other hand, an optical disc apparatus for recording and reproducing data on and from this kind of optical disc has a high-speed recording function capable of recording in a ZCLV (Zone Constant Linear Velocity) system in which the speed is changed for each zone during recording. .
[0004]
This high-speed recording function can record data at a speed several times to ten and several times the standard recording speed. For example, the data can be recorded in advance at four times, eight times, 12 times, and 16 times the standard recording speed. This is executed by the user selecting a desired speed from a plurality of set high-speed recording speeds.
[0005]
By the way, in an optical disk apparatus having such a high-speed recording function, first, test writing is performed on an optical disk at a preset recording double speed (for example, 4 × speed), and the recording power is controlled to an optimum state. ing.
[0006]
Controlling the recording power by such test writing actually requires extremely complicated processing, but at present, the OPC (Optimum Power Control) method is widely used.
[0007]
According to the OPC method, simply put, a plurality of types of test patterns having different polarity reversal intervals are sequentially changed in a test writing area (PCA: Power Calibration Area) on an optical disk while changing the recording power in a stepwise manner. Record. Then, each type of test pattern recorded is reproduced from the optical disk while changing the recording power stepwise, and the recording power at which the asymmetry is almost “0” is determined as the optimum recording power at the high recording speed. This is set to a PMA (Power Management Area) on the optical disc.
[0008]
In an optical disk apparatus that records data on an optical disk by the conventional ZCLV recording method, when recording data at a high recording speed, for example, 36 times speed, it is not possible to measure the recording power in a test writing area on the inner peripheral side. That is, it is physically impossible at present to rotate at a high speed of about 36 times in the inner circumference. Therefore, the recording power at the quadruple speed of the low reference obtained above is first determined, and the optimum recording power at the time of the recording double speed other than the quadruple speed is determined by using a calculation formula in the obtained recording power. .
[0009]
[Problems to be solved by the invention]
However, in the above-described optical disc apparatus, since the recording power of each double speed is determined only once in a preset recording double speed (for example, quadruple speed) OPC, the reference OPC at quadruple speed is greatly shifted. In this case, as the recording speed increases, a deviation from the recording power required by the optical disc occurs. That is, at an arbitrary double speed of ZCLV recording, the recording power becomes higher than required by the optical disc, and at a certain double speed, the recording power required by the optical disc cannot be output.
[0010]
Therefore, the present invention has been made to solve the above-described problem. In the ZCLV recording method, OPC is performed not only once but also several times at different double speeds, and a straight line is passed so that these OPCs pass. It is an object of the present invention to provide an optical disk device capable of determining the recording power in a specific manner and a recording power control method for the optical disk device.
[0011]
[Means for Solving the Problems]
The present invention is directed to an apparatus for recording data on an optical disc at a high-speed recording speed selected from a plurality of types of high-speed recording speeds. A first recording power determining means for irradiating the test writing area of the optical disc with a light beam at a first recording speed of the plurality of types of recording speed to determine a first recording power; A second recording power determining means for irradiating the test writing area with a light beam at a second recording speed other than the first recording speed to determine a second recording power; and first and second recording powers. And a third recording power determining unit that determines an optimum recording power at a recording speed other than the first and second recording speeds based on the first and second recording powers determined by the power determining unit. It was made.
[0012]
According to the above configuration, the recording power at the first recording speed is determined by trial writing, the recording power at the second recording speed is determined, and the first and second recording powers are determined based on the determined recording power. The recording power at a recording speed other than the recording speed of No. 2 is determined. Therefore, even if the recording power determined at the first recording speed is largely deviated, the recording power at another recording speed does not cause much deviation.
[0013]
According to another aspect of the present invention, there is provided an optical disk apparatus for performing data recording on an optical disk at a recording speed selected from a plurality of types of recording speeds. A first determining means for irradiating a test beam area of the optical disk with a light beam to determine the respective recording power at a double speed at which the method can be performed, and linearly connecting the respective recording powers determined by the determining means. , A second determining means for determining an optimum recording power at double speed where OPC cannot be performed.
[0014]
According to the above configuration, the recording power at the double speed at which the OPC can be performed, that is, the double speed (4 ×, 8 ×, 12 ×, 16 ×, and 24 × speed) at which the disk motor can be physically rotated is determined. Based on the determined recording power, the recording power at the recording double speed at which OPC cannot be performed is determined. Therefore, since there are a plurality of initially determined recording powers, the recording powers do not significantly deviate, and the recording power at the recording double speed at which OPC cannot be performed can be accurately determined.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. That is, FIG. 1 shows an overall configuration of an optical disk device capable of recording data on an optical disk by the ZCLV recording method described in this embodiment.
[0016]
This optical disc apparatus can record a plurality of types of high-speed recording speeds (for example, four times or eight times the standard recording speed) on an optical disc 1 such as a CD-R, a CD-RW (rewritable), a DVD-R, and a DVD-RW. , 12 times, 16 times, etc.). The optical disk device includes a system controller 10, a disk motor 12, an optical pickup 14, an RF amplifier 16, a signal processing circuit 18, a laser emission driver 20, a laser output setting circuit 22, a comparison correction circuit 24, an RF signal amplitude value detection circuit 26, and an encode. It includes a processing circuit 28, a buffer memory 30, and an interface 32.
[0017]
The system controller 10 controls each unit to record data on the optical disk 1 and reproduce data recorded on the optical disk 1. The disk motor 12 drives the optical disk 1 to rotate at a constant linear velocity, for example. The optical pickup 14 includes a semiconductor laser that irradiates the optical disc 1 with a light beam. This semiconductor laser outputs a light beam of recording power and a light beam of reproduction power. The optical pickup 14 includes a photodetector (not shown) that detects light reflected from the optical disc 1. The photodetector converts reflected light from the optical disc 1 into an electric signal, that is, a reproduced signal, and outputs the signal.
[0018]
The RF amplifier 16 generates an RF signal and a servo signal from the reproduced signal. The signal processing circuit 18 decodes the RF signal. The signal processing circuit 18 generates a control signal for controlling the focus and tracking of the optical pickup from the servo signal. Further, the signal processing circuit 18 generates a control signal for controlling the rotation of the disk motor 12 from the servo signal.
[0019]
The laser output setting circuit 22 sets the recording power and the reproduction power of the light beam supplied from the system controller 10. Further, the laser output setting circuit 22 adjusts the set value of the recording power based on the reflectance fluctuation obtained from the RF signal. The laser emission driver 20 causes a semiconductor laser mounted on the optical pickup 14 to emit a light beam having a power based on the setting by the laser output setting circuit 22.
[0020]
The RF signal amplitude value detection circuit 26 detects the symmetry of the reproduced signal. That is, as shown in FIG. 2, the RF signal amplitude value detection circuit 26 detects the average value of the amplitude of the reproduction signal and detects an intermediate value between the peak level and the bottom level of the reproduction signal. The comparison correction circuit 24 compares the average amplitude value with the intermediate value, and supplies a correction signal to the laser emission driver 20 based on the comparison result. More specifically, the comparison correction circuit 24 compares the average amplitude value with the intermediate value, and when the average amplitude value is lower than the intermediate value, outputs a correction signal for lowering the laser emission output from the set value by the laser output setting circuit. Output. Conversely, the comparison correction circuit 24 compares the amplitude average value with the intermediate value, and outputs a correction signal for increasing the laser emission output from the value set by the laser output setting circuit when the amplitude average value is higher than the intermediate value.
[0021]
The encoding processing circuit 28 encodes the recording data. The buffer memory 30 temporarily stores the data processed by the encoding processing circuit 28 and the processed data. The interface 32 supplies recording data from the outside to the encoding processing circuit 28 and supplies reproduction data decoded by the signal processing circuit 18 to the outside.
[0022]
(Recording power control)
Next, recording power control in the optical disk device of the present invention will be described. FIG. 3 is a flowchart for explaining the recording power control.
First, the system controller 10 determines whether the power of the optical disk device in which the optical disk 1 is loaded is turned on or whether the optical disk 1 is loaded in the optical disk device in which the power is turned on (ST1). . If the power is not turned on or the optical disc 1 is not loaded (N in ST1), the process of ST1 is repeated. When the power is turned on or the optical disk 1 is loaded (Y in ST1), the system controller 10 sets the test writing area on the inner circumference side of the optical disk 1 to a preset recording double speed (supported by the optical disk device). The disk motor 12 is controlled to drive the optical disk 1 to a reference double speed (here, for example, 4 × speed) (ST3).
[0023]
Then, the system controller 10 causes the encoding processing circuit 28 to generate a test pattern, and supplies the test pattern to the laser emission driver 20 (ST5). In response to this, the laser emission driver 20 causes the semiconductor laser to emit light in the test writing area corresponding to the test pattern (ST7). At this time, the system controller 10 supplies the laser output setting circuit 22 with an output value such that the laser power changes stepwise. Along with this, the power of the semiconductor laser changes stepwise. That is, the test pattern is recorded in the test writing area by the laser power that changes stepwise. By reproducing this test pattern, the recording power at which the asymmetry becomes substantially "0" is determined as the optimum recording power at the quadruple speed (ST9, ST11). The system controller 10 controls the encoding processing circuit 28 to cause the laser emission driver 20 to record the value of the recording power obtained in ST11 in the PMA area of the optical disc 1 (ST13).
[0024]
Next, the system controller 10 controls the disk motor 12 to rotate the optical disk 1 so that the test writing area of the optical disk 1 becomes a support double speed (here, 8 × speed) other than 4 × speed (ST15).
[0025]
Then, the system controller 10 causes the encoding processing circuit 28 to generate a test pattern, and supplies the test pattern to the laser emission driver 20 (ST17). In response, the laser emission driver 20 causes the semiconductor laser to emit light in the test writing area corresponding to the test pattern (ST19). At this time, the system controller 10 supplies the laser output setting circuit 22 with an output value such that the laser power changes stepwise similarly to the above, and changes the power of the semiconductor laser stepwise. By reproducing this test pattern, the recording power at which the asymmetry becomes substantially “0” is determined as the optimum recording power at 8 × speed (ST21, ST23). The system controller 10 controls the encoding processing circuit 28 to cause the laser emission driver 20 to record the value of the recording power obtained in ST23 in the PMA area of the optical disc 1 (ST25).
[0026]
Then, based on each recording power recorded in the PMA area in ST13 and ST25, as shown in FIG. 4, the system controller 10 optimizes the recording power at recording speeds other than quadruple speed and octuple speed (supported by the optical disc device). The recording power at all recording double speeds) is obtained (ST27). As a method of obtaining the recording power, the points of the recording power at 4 × speed and the recording power at 8 × speed are connected linearly as shown in FIG. 4 to determine the optimum recording power at each speed. That is, the correlation is determined by obtaining the correlation between the recording double speed and the recording power at that time.
[0027]
When the optimum recording power at each double speed is determined in ST27, the system controller 10 controls the encoding processing circuit 28 to cause the laser emission driver 20 to perform recording on the PMA area of the optical disc 1 (ST29).
[0028]
As described above, in the present invention, in addition to the recording power (first time) at quadruple speed (set in advance by the optical disc device) obtained at ST13, the recording power (second time) at eight times speed is obtained, and these recordings are performed. On the basis of the power, the optimum recording power at a double speed other than the quadruple speed and the octuple speed is obtained when the power is turned on or when the optical disk is loaded. As a result, the optimum recording power at another recording double speed supported by the optical disc device can be obtained, and the accuracy of the recording power is significantly improved as compared with the case where the recording power is determined only once by the OPC. In the description here, two quadruple-speed and eight-fold speed recording powers are obtained in ST3 and ST15, but the present invention is not limited to this. For example, four-times, eight-times, and twelve-times recording powers are used. Or three recording speeds supported by the optical disk device (however, if the inner peripheral side of the disk is too high in speed, it cannot physically rotate, so the disk motor can rotate. (Double speed) recording power. That is, in FIG. 5, since the double speed at which OPC can be performed is up to 24 × speed, the recording power is obtained from 4 × speed to 24 × speed, and the obtained recording powers are linearized, and the physical influence of OPC is obtained. It is also possible to find the recording power at a double speed that cannot be performed by the above, that is, at a double speed higher than 24 × speed.
[0029]
The present invention is not limited to the above-described embodiment, and can be variously modified in an implementation stage without departing from the gist of the invention.
[0030]
【The invention's effect】
As described above, when the power is turned on or the optical disk is loaded, the OPC is performed at the preset recording double speed (for example, 4 × speed) in the optical disk device to obtain the optimum recording power, and the optical disk device supports it. OPC is performed at double speeds other than the 4 × speed (for example, 8 × speed, 12 × speed, 16 × speed, and 24 × speed) to determine the optimum recording power. (For example, 32 × speed, 48 × speed, etc.), the optimum recording power is determined. For this reason, the recording power at all the double speeds supported by the optical disc device can be determined more accurately than before, and the recording power becomes higher than required by the optical disc at any double speed of ZCLV recording. Further, it is possible to solve the problem that the recording power required by the optical disc cannot be output at a certain double speed.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of an optical disc device according to an embodiment of the present invention.
FIG. 2 is a diagram for explaining an average amplitude value of a reproduction signal and an intermediate value between a peak level and a bottom level of the reproduction signal.
FIG. 3 is a flowchart for controlling a recording power.
FIG. 4 is a correlation diagram between the recording power and the recording speed shown by the OPC.
FIG. 5 is a diagram showing a boundary between a double speed at which OPC can be performed and a double speed at which OPC cannot be performed.
[Explanation of symbols]
Reference Signs List 10 System controller 12 Disk motor 14 Optical pickup 16 RF amplifier 18 Signal processing circuit 20 Laser emission driver 22 Laser output setting circuit 24 Comparison correction circuit 26 RF signal amplitude value detection circuit 28 Encoding processing circuit 30 Buffer memory 32 Interface

Claims (8)

In an optical disc device that performs data recording on an optical disc at a recording speed selected from a plurality of types of recording speeds,
First recording power determining means for irradiating a test beam area of the optical disc with a light beam to determine a first recording power at a first recording speed of the plurality of types of recording speeds;
Second recording power determining means for irradiating the test writing area with a light beam at a second recording speed other than the first recording speed among the plurality of types of recording speeds to determine a second recording power; ,
Determining an optimum recording power at a recording speed other than the first and second recording speeds based on the first and second recording powers determined by the first and second recording power determining means; 3. An optical disk device comprising: a recording power determining unit according to (3). In an optical disc device that performs data recording on an optical disc at a recording speed selected from a plurality of types of recording speeds,
First determining means for irradiating a test beam area of the optical disk with a light beam at a double speed capable of performing the OPC method among the plurality of types of recording speeds and determining respective recording powers;
An optical disc apparatus comprising: a second determining unit that linearly connects the respective recording powers determined by the determining unit to determine an optimum recording power at a double speed at which OPC cannot be performed. The third recording power determining means obtains a correlation between the first recording speed and the second recording speed and the first recording power and the second recording power, and calculates an optimum recording speed at all recording speeds. 2. The optical disk apparatus according to claim 1, wherein the recording power is determined. 2. The optical disc apparatus according to claim 1, wherein the first recording power determining means and the second recording power determining means determine the recording power by trial writing, using an OPC method. In a recording power control method of an optical disk device for performing data recording on an optical disk at a recording speed selected from a plurality of types of recording speeds,
A first step of irradiating a test writing area of the optical disc with a light beam at a first recording speed of the plurality of types of recording speeds to determine a first recording power;
A second step of irradiating the test writing area with a light beam at a second recording speed other than the first recording speed among the plurality of types of recording speeds to determine a second recording power;
A third step of determining an optimum recording power at a recording speed other than the first and second recording speeds based on the determined first and second recording powers. A recording power control method for an optical disk device. In a recording power control method of an optical disk device for performing data recording on an optical disk at a recording speed selected from a plurality of types of recording speeds,
Irradiating a test beam area of the optical disk with a light beam at a double speed at which the OPC method can be performed among the plurality of types of recording speeds, and determining respective recording powers;
Determining the optimum recording power at double speed at which OPC cannot be performed by linearly connecting the determined recording powers. In the third step, a correlation between the first recording speed and the second recording speed and the first recording power and the second recording power is obtained to determine an optimum recording power at all recording speeds. 6. The recording power control method for an optical disk device according to claim 5, wherein: 6. The recording power control method for an optical disk device according to claim 5, wherein the determination of the recording power by test writing in the first step and the second step uses an OPC method.

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