JP2002304732A - Optical disk recording speed deciding method and optical disk recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decide the range of a recording speed which can actualize excellent recording with a small number of errors when some optical disk is recorded. SOLUTION: A β-C1 error characteristic derivation part 203 finds the relation between β values by recording speeds and C1 error values from the β values and C1 error values detected through test recording. A C1 error proper value information storage part 200 is stored with information showing a possible range of C1 error values for excellent recording previously found through experimentation and a recording speed-β value characteristic derivation part 204 finds the relation with possible ranges of recording speeds and β values according to the relation between the β values and C1 error values. A recordable speed derivation part 205 finds the maximum recording speed at which the recording device can perform excellent recording from the information showing a proper range of the β values stored in the β proper value information storage part 202 and the relation between the ranges of the recording speeds and βvalues.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a CD-R (Compac
t Disc-Recordable) and CD-RW (Compact Disc-ReWr)
The present invention relates to an optical disk recording speed determination method and an optical disk recording device that determine a recording speed at which good recording can be performed when information is recorded on an optical disk such as an itable.

[0002]

2. Description of the Related Art Conventionally, CD-Rs and DVD-Rs (Digi
As a recording method for an optical disc such as a tal versatile disc-recordable (high-speed recording), recording is performed at a linear velocity (for example, 2 ×, 4 ×,...) higher than a standard linear velocity (1 ×). .

Conventionally, by changing the so-called strategy for adjusting the recording laser power, irradiation time, irradiation start timing, and the like according to the recording speed magnification as described above, recording is performed with less reading errors at each double-speed recording speed. I was

[0004]

However, some types of optical discs to be recorded are not compatible with high-speed recording, and when recording is performed on such an optical disc at a high speed, a recording error occurs. There is a high risk of occurrence. Also,
Even when recording is performed on an optical disk that supports high-speed recording, a recording error may occur depending on the compatibility between the recording device and the optical disk. In some cases, playback may not be possible.

Conventionally, prior to actual recording, test recording is performed in a predetermined area on an optical disk at a set recording speed, and an OPC (Optimum Power Control: Recording) for obtaining a recording laser power capable of performing optimum recording at the recording speed. Beam power adjustment) has been implemented,
OPC cannot determine at what speed recording can be performed. An optical disc to be recorded;
If it is possible to determine how fast recording can be performed in combination with a recording device that performs recording on the optical disc, a combination of the optical disc and the recording device will not cause a recording error and can be performed in a shorter time. Although it is possible to perform recording, conventionally, no effective method has been proposed for determining the range of the recording speed at which good recording can be realized.

The present invention has been made in view of the above circumstances, and when performing recording on a certain optical disc,
It is an object of the present invention to provide an optical disk recording speed determination method and an optical disk recording device capable of determining a recording speed capable of realizing good recording with few recording errors.

[0007]

In order to solve the above problems, an optical disk recording speed determination method according to the present invention comprises a test recording step of performing test recording on an optical disk prior to actual recording of the optical disk; A reproduction step of obtaining a reproduction signal of the test-recorded area on the optical disc; and a relationship between a β value or a recording laser power value and a predetermined parameter relating to the quality of a recording state based on the reproduction signal of the test recording area. A first deriving step of obtaining a first recording characteristic for each of one or a plurality of recording speeds, a first recording characteristic obtained for each of the one or a plurality of recording speeds, and good recording stored in advance. A recording speed based on first suitable value information indicating a value that the predetermined parameter can take,
A second deriving step of obtaining a second recording characteristic indicating a relationship between the β value for obtaining a value indicated by the preferred value information or a range in which the recording laser power value can be taken; A recordable speed at which the optical disc can be properly recorded on the optical disk based on the β value or second suitable value information indicating a value that the recording laser power value can take to perform good recording stored in advance. And a recording speed deriving step of determining the recording speed.

According to the present invention, test recording is performed on an optical disc on which actual recording is to be performed, and from the result of the test recording, a β value or a recording laser is set such that a parameter relating to the quality of a recording state falls within a suitable range. Since the power value range can be derived and the recording speed at which the derived β value or recording laser power value falls within a suitable value can be obtained, the recording speed at which good recording with few recording errors can be realized Can be determined.

In the above-mentioned method, the method further comprises a discriminating step of discriminating the type of the optical disk, and in the second deriving step, a plurality of pieces of the first suitable value information recorded for each type of the disk are provided. From among
A disc corresponding to the disc type determined in the discriminating step is selected, and in the recording speed deriving step, the discriminating step is performed based on the second suitable value information recorded for each disc type. Alternatively, a disc corresponding to the disc type determined in step (1) may be selected.
Further, in the above method, the predetermined parameter may include at least one of the number of detections of a synchronization signal within a predetermined period, a C1 error, a jitter, a deviation, a modulation factor, a reflectance, and an amplitude of a reproduction signal.

An optical disk recording apparatus according to the present invention is an optical disk recording apparatus for recording information by irradiating a laser beam onto an optical disk, and performs test recording on the optical disk prior to actual recording on the optical disk. Test recording means for obtaining a reproduction signal of the test-recorded area on the optical disc; and a β value or recording laser power based on the reproduction signal of the test recording area reproduced by the reproduction means. First deriving means for determining, for each of one or a plurality of recording speeds, a first recording characteristic indicating a relationship between the value and a predetermined parameter relating to the quality of the recording state; First storage means for storing first suitable value information indicating a possible value; 1 based on the recording characteristics and the first preferred value information stored in the first storage means, and the β value for taking a value indicated by the first preferred value information. Alternatively, a second deriving unit for obtaining a second recording characteristic indicating a relationship with a range in which the recording laser power value can be taken, and indicating a value that the β value or the recording laser power value can take in order to perform good recording. Appropriate recording on the optical disc based on second storage means for storing second preferred value information, the second recording characteristic, and second preferred value information stored in the second storage means. Recording speed deriving means for obtaining a recordable speed at which recording can be performed.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. A. 1. Configuration of Embodiment First, FIG. 1 is a block diagram showing a configuration of an optical disc recording / reproducing apparatus according to an embodiment of the present invention. As shown in FIG. 1, the optical disc recording / reproducing apparatus includes an optical pickup 10, a spindle motor 11, an RF amplifier 12,
Servo circuit 13, address detection circuit 14, decoder 15, control unit 16, encoder 17, strategy circuit 18, laser driver 19, laser power control circuit 20, frequency generator 21, envelope detection circuit 22, a C1 error detection circuit 23, and a β detection circuit 24
And

A spindle motor 11 is an optical disk (here, a CD-R) on which data is recorded.
D is a motor that drives D to rotate. Optical pickup 10
Has an optical system such as a laser diode, a lens and a mirror, and a return light receiving element, and irradiates a laser beam to the optical disk D during recording and reproduction, and receives and receives return light from the optical disk D. EFM (Eigh
t to Fourteen Modulation)
Output to the amplifier 12. The optical pickup 10 has a monitor diode, and a current is generated in the monitor diode by the return light of the optical disk D, and the current is supplied to the laser power control circuit 20.

The RF amplifier 12 amplifies the EFM-modulated RF signal supplied from the optical pickup 10, and converts the amplified RF signal into a servo circuit 13, an address detection circuit 14,
An RF signal is output to the envelope detection circuit 22, the β detection circuit 24, and the decoder 15. At the time of reproduction, the decoder 15 performs EFM demodulation of the EFM-modulated RF signal supplied from the RF amplifier 12 to generate reproduction data.

On the other hand, at the time of recording, the decoder 15 performs EFM demodulation of the RF signal supplied from the RF amplifier 12 when reproducing the area recorded by the test recording, and the C1 error detection circuit 23 performs the demodulation based on the demodulated signal. The C1 error is detected and output to the control unit 16. The C1 error detection circuit 23 applies a CIRC (Cross
s Error correction using an error correction code called Interleaved Read Solomon Code) is performed to detect the number of frames for which the first error correction cannot be performed in one subcode frame (98 EFM frame), that is, the number of C1 errors. is there.

In the optical disk recording / reproducing apparatus according to the present embodiment, when performing recording, prior to the actual recording, test recording is performed on a predetermined area on the inner peripheral side of the optical disk D (see FIG. 2). Based on the reproduction result of the recorded area, a recording speed at which good recording can be performed on the optical disc D is determined. The C1 error detection circuit 23 detects the C1 error of the reproduction signal in the area where the test recording is performed and outputs the C1 error to the control unit 16.

Here, referring to FIG.
An area for performing (CD-R) test recording will be described. A section of the optical disc D having a diameter of 46 to 50 mm is prepared as a lead-in area 114, and a program area 118 for recording data and a remaining area 120 are provided on the outer peripheral side. On the other hand, an inner side PCA (Power Calibration Area) area 112 is provided on the inner side of the lead-in area 114. A test area 112a and a count area 112b are provided in the inner PCA area 112, and a test recording prior to the above-described actual recording processing is performed in the test area 112a. Here, an area in which test recording can be performed many times is prepared as the test area 112a, and an EFM signal indicating to which part of the test area 112a the recording has been completed at the end of the test recording is provided in the count area 112b. Be recorded. Therefore, the next time test recording is performed on the optical disc D, the EF of the count area 112b
By reading the M signal, it is possible to know from which position in the test area 112a the test recording should be performed. In the optical disc recording / reproducing apparatus according to the present embodiment, the test area 112 a
The test record is being made at that time.

Returning to FIG. 1, the address detection circuit 14
A wobble signal component is extracted from the EFM signal supplied from the F amplifier 12, and time information (address information) of each position included in the wobble signal component, identification information for identifying the disk (disk ID), a dye of the disk, and the like. , And outputs the information to the control unit 16.

The β detection circuit 24 supplies E supplied from the RF amplifier 12 when reproducing the test recording area described above.
A β (asymmetry) value is calculated from the FM-modulated RF signal as a parameter relating to the reproduction signal quality, and the calculation result is output to the control unit 16. The β value is determined by (a + b) / (ab), where a is the peak level (sign is +) and b is the bottom level (sign is −) of the EFM-modulated signal waveform.

Before performing the above-described test recording, the envelope detection circuit 22 detects the portion of the predetermined test area of the optical disk D from which the test recording is to be started. E
The envelope of the FM signal is detected.

The servo circuit 13 includes a spindle motor 11
And the focus control, tracking control, and feed control of the optical pickup 10. In the optical disk recording / reproducing apparatus according to the present embodiment, a method of driving the optical disk D at a constant angular velocity during recording (CAV: Constant A)
ngular velocity (CLV) and a method of driving the optical disc D while keeping the linear velocity constant (CLV: Constant Linear Velocit)
y), and the servo circuit 13 switches between CAV control and CLV control in accordance with a control signal supplied from the control unit 16.
Here, in the CAV control by the servo circuit 13, the control is performed such that the rotation speed of the spindle motor 11 detected by the frequency generator 21 matches the set rotation speed. In the CLV control by the servo circuit 13, the RF
The spindle motor 11 is controlled so that the wobble signal of the EFM-modulated signal supplied from the amplifier 12 has the set linear velocity magnification.

The encoder 17 performs EFM modulation on the supplied recording data, and outputs the recording data to the strategy circuit 18. The strategy circuit 18 uses the EF supplied from the encoder 17
A time axis correction process or the like is performed on the M signal and output to the laser driver 19. The laser driver 19 drives the laser diode of the optical pickup 10 under the control of the signal modulated according to the recording data supplied from the strategy circuit 18 and the laser power control circuit 20.

The laser power control circuit 20 controls the laser power emitted from the laser diode of the optical pickup 10. Specifically, the laser power control circuit 20 determines the optimum laser power based on the current value supplied from the monitor diode of the optical pickup 10 and information indicating the optimum laser power target value supplied from the control unit 16. Optical pickup 10 with high laser power
The laser driver 19 is controlled so as to be irradiated from the.

The control unit 16 has a CPU (Central Process
ng Unit), ROM (Read Only Memory) and RAM
(Random Access Memory), etc.
In accordance with the program stored in M, each unit of the optical disk recording / reproducing apparatus is controlled.

First, the control unit 16 controls each unit of the optical disk D so as to perform test recording on a predetermined area of the optical disk D set in the optical disk recording / reproducing apparatus before the actual recording as described above. Further, the control unit 16
Is the β detected by the β detection circuit 24 from the signal obtained when the above-described test-recorded area is being reproduced.
Value and C detected by the C1 error detection circuit 23.
Based on the count value of one error and the like, the optical disc recording / reproducing apparatus performs a recording speed determination process for finding a recordable speed at which good recording without a recording error can be performed on the optical disc D on which test recording has been performed. Thus, the control unit 1 performs the recording speed determination processing for obtaining the recordable speed.
6 shows the functional configuration of FIG.

As shown in FIG. 1, the control unit 16 includes a C1 error preferred value information storage unit (first preferred value information storage means) 2
00, a recording speed-β characteristic function storage unit 201, a β preferred value information storage unit (second preferred value information storage unit) 202,
β-C1 error characteristic deriving unit (first deriving unit) 203;
It has a recording speed-β characteristic deriving unit (second deriving unit) 204 and a recordable speed deriving unit (recording speed deriving unit) 205.

The β-C1 error characteristic deriving section 203 calculates the β value detected by the above-described β detection circuit 24 and the count value of the C1 error detected by the C1 error detection circuit 23 (hereinafter referred to as C1 error value). Based on the supplied β value and the supplied C1 error value, a plurality of recording speeds (V1, V2, V2 in the illustrated example) as shown in FIG.
3: A recording characteristic indicating the relationship between the β value for each of V1 <V2 <V3) and the count value of the C1 error is obtained. In order to obtain the characteristics for each of a plurality of recording speeds, three recording speeds V
Test recording is performed at 1, V2, and V3, and the recording characteristics at each speed may be obtained from the β value and the C1 error value detected from the reproduction signal of the area recorded at each speed. Note that test recording was not performed at each speed for obtaining the recording characteristics as shown in FIG. 3, but was performed only at a certain recording speed, for example. The characteristics of the recording speed other than the speed at which the test recording was performed may be obtained by using other speed estimation data created based on experimental results and the like. The test recording may be performed once for a certain speed (one or a plurality of speeds), or may be performed a plurality of times, but in order to obtain a more accurate determination result. Is preferably performed a plurality of times.

The recording speed-β characteristic deriving unit 204 calculates the β-C1 error characteristic for each of a plurality of recording speeds obtained by the β-C1 error characteristic deriving unit 203 and the C1
Based on the C1 error preferred value information stored in the error preferred value information storage unit 200, a recording speed-β characteristic indicating the relationship between the recording speed and the β value as shown in FIG.
As shown in FIG. 5, the C1 error preferred value information storage unit 200
For each type of optical disc D (manufacturer and dye),
Information indicating the range of the C1 error value for performing good recording is stored. In the example shown in the figure, the type A disk has a C1 error value of 0 to 10 (the maximum C1 error value is 98). Information that good recording can be performed within the range is stored. Here, the information stored in the C1 error preferred value information storage unit 200 is a value previously obtained for each type of disc by an experiment or the like. Recording speed-β
The characteristic deriving unit 204 uses the C1 error preferred value information stored in the C1 error preferred value information storage unit 200 to obtain a recording speed-β characteristic as shown in FIG.

First, the recording speed-β characteristic deriving unit 204
From the preferred value information stored in the C1 error preferred value information storage unit 200, the C1 error preferred value information corresponding to the type information of the optical disc D detected by the address detection circuit 14 is obtained. Then, based on the acquired C1 error preferable value information and the β-C1 error characteristic shown in FIG. 4A obtained by the above-described β-C1 error characteristic deriving unit 203, for each of the three types of recording speeds, The upper limit and the lower limit of the β value within which the C1 error value falls within the range indicated by the acquired C1 error suitable value information are obtained. For example, when the type information of the disk detected by the address detection circuit 14 is A, the preferred value corresponding to the type A is selected from the C1 error preferred value information stored in the C1 error preferred value information storage unit 200. Acquire information (0 to 10). And FIG.
As shown in (b), the upper limit values PJ1, PJ2, P that the β value can take in order to keep the C1 error value within the range of 1 to 10 indicated in the acquired C1 error preferred value information.
J3 and the lower limit values PK1, PK2, PK3 are determined.

As described above, the upper limit values PJ1, PJ2, PJ3 and the lower limit values PK1, PJ that the β value can take for each recording speed are obtained.
When K2 and PK3 are obtained, the recording speed-β characteristic deriving unit 20
4 is based on the obtained upper limit values PJ1, PJ2, PJ3 and lower limit values PK1, PK2, PK3 and the function information stored in the recording speed-β characteristic function storage unit 201.
The relationship between the recording speed as shown in (b) and the range between the upper limit and the lower limit of the β value is obtained. Recording speed-
The β characteristic function storage unit 201 stores function information indicating how each of the upper limit and the lower limit of the β value in which the C1 error value falls within a suitable range as described above changes with a change in recording speed. It is remembered. Here, the function information is created based on the upper limit value and the lower limit value of the β value for a large number of recording speeds obtained by an experiment in which test recording is performed at a large number of recording speeds in advance. A linear function (that is, a function that changes on a straight line in the graph shown in FIG. 4B) is stored. As for this function information, optimal information may be stored for each type of optical disc D (manufacturer and dye), and may be appropriately selected according to the type information of optical disc D. Such function information, the upper limit value PJ1, PJ2, PJ3, and the lower limit value P
From K1, PK2, and PK3, the displacement of the upper limit value and the lower limit value of β with respect to the recording speed can be defined by the straight line L1 and the straight line L2 in the graph shown in FIG. By defining such straight lines L1 and L2, it is possible to obtain the relationship between the value βm indicating the range of β values represented by (upper limit value of β−lower limit value of β) and the recording speed. 6
The recording speed-β range characteristic shown in FIG. Note that, as described above, the characteristic for each of the three recording speeds
Upper limit PJ1, PJ2, PJ3 and lower limit PK
1, PK2, and PK3, and the relationship between the range βm in which the β value can be taken and the recording speed may be obtained. However, the upper limit value and the lower limit value are stored in the recording speed-β characteristic function storage unit 201. If two functions (for example, a linear function y = ax + b + c (c is a variable value for substituting an upper limit value or a lower limit value of an actual measurement, a and b are fixed values)) are obtained, a certain speed, For example, when the upper limit value PJ1 and the lower limit value PK1 of V1 are obtained, the straight line L is calculated using the above linear function.
1, L2 can be defined, whereby the relationship between the range βm in which the β value can be taken and the recording speed can be obtained.
In this manner, the β-C1 error characteristic of one speed
The relationship between the range βm in which the value can be taken and the recording speed may be obtained. In this case, it goes without saying that test recording should be performed only at a single speed. Also,
Rather than preparing two functions for the upper limit value and the lower limit value as described above, a function indicating the relationship between the range βm that the β value can take and the recording speed (for example, a linear function y = Ax + B + C)
(C is a variable value for substituting the difference between the upper limit value and the lower limit value of one actually measured speed, and A and B are fixed values). The relationship between the range βm in which the β value can be taken and the recording speed may be determined from the measured value of the difference between the upper limit and the lower limit.

The recordable speed deriving unit 205 stores the recording speed-β range characteristic obtained by the recording speed-β characteristic deriving unit 204 as described above and the β preferable value stored in the β preferable value information storage unit 202. Based on the information, the maximum speed at which the optical disk recording / reproducing apparatus can perform recording on the optical disk D on which test recording has been performed while maintaining good recording quality is obtained. As shown in FIG. 7, the β suitable value information storage unit 202 stores information indicating a value that allows a fluctuation range of the β value for performing good recording for each type of optical disc D (manufacturer and dye). In the example shown in the figure, information indicating that a good recording can be performed when the range of the β value is 10 or more is stored in the type A disk. In other words, it becomes more difficult for the optical disc recording / reproducing apparatus to control the β value within the smaller value range due to the warp of the optical disc D, uneven dye, or the like, as the range of the target suitable β value becomes smaller. Become. The β preferable value information storage unit 202 considers that control becomes difficult if the range of the target β value is very small, and the optical disk recording / reproducing apparatus is provided even if the optical disk D is warped or the dye is uneven. Is stored so that the β value can be sufficiently controlled within the target range. Here, the β suitable value information storage unit 20
The information stored in No. 2 is a value obtained in advance for each disc type by an experiment or the like. Recordable speed derivation unit 205
The maximum recording in which the range of β falls within the range indicated by the suitable value information based on the characteristics shown in FIG. 6 using the suitable value information of the range of β values stored in the β suitable value information storage unit 202 as described above. The speed is determined as the maximum speed at which the optical disc recording / reproducing apparatus can perform recording on the optical disc D on which test recording has been performed while maintaining the recording quality.
In the example shown in FIG. 6, the suitable value information of the β value range βm is 10
The above case is shown. In this case, the characteristic straight line L3 and βm
The recording speed Vmax at which the = 10 straight line L4 intersects is determined as the maximum recordable speed.

Returning to FIG. 1, the control unit 16 in the optical disk recording / reproducing apparatus according to the present embodiment performs control for switching the recording mode between CAV and CLV based on the maximum recordable speed obtained as described above. Has become. Specifically, the control unit 16 controls the servo circuit 13 so as to perform recording by the CAV method at the time of recording on the innermost peripheral side. After starting the recording in this manner, the control unit 16 specifies the radial position of the optical disc D based on the address information supplied from the address detection circuit 14 and drives the spindle motor 11 at a predetermined angular velocity. When it is detected that the position corresponds to the maximum speed obtained as described above, CA
A control signal for switching from the V system to the CLV system is output to the servo circuit 13. As shown in FIG. 8, when the spindle motor 11 is driven by the CAV method at a rotation speed corresponding to a linear speed of 12 times at the innermost peripheral position, the maximum speed at which the linear speed is obtained at this rotation speed ( Here, when it is detected that the position in the radial direction has reached 16 × speed, the control unit 16 outputs a control signal to the servo circuit 13 to instruct to switch to CLV. Thus, thereafter, the spindle motor 11 is driven by the servo circuit 13 in the 16 × CLV system.

During recording in the CAV system, the control section 16 sequentially outputs information indicating a target value of the optimum laser power corresponding to the linear velocity to the laser power control circuit 20.
That is, when performing the CAV recording, since the linear velocity changes sequentially during the recording, the information indicating the target value of the laser power optimal for the linear velocity that changes sequentially is output. In particular,
As recording on the outer peripheral side of the disk proceeds, that is, as the linear velocity becomes higher, a larger laser power is sequentially output to the laser power control circuit 20 as a target value. here,
The optimal laser power target value corresponding to the linear velocity may be obtained by referring to a data table created in advance by experiments or the like, or the optical disk D may be obtained before actual recording.
The test recording may be performed in the innermost peripheral portion of, and the optimum laser power target value at each linear velocity may be obtained from the reproduced signal obtained by reading the recorded portion by performing so-called OPC.

B. Operation of the Embodiment The configuration of the optical disc recording / reproducing apparatus according to an embodiment of the present invention has been described above. Hereinafter, the operation of the optical disc recording / reproducing apparatus having the above configuration at the time of recording will be described with the control unit 16 shown in FIG. This will be described with reference to the flowchart of the process to be executed.

First, when the user sets the optical disc D in the optical disc recording / reproducing apparatus and instructs the start of recording, the test area 11 of the set optical disc D is set.
Test recording is performed on 2a (step Sa1). And
The control unit 16 uses the β value and the C1 error value detected from the reproduction signal in the test recording area to determine the maximum recording speed at which the optical disc recording / reproducing apparatus can perform good recording on the set optical disc D. It is derived (step Sa2).

Thereafter, the control unit 16 instructs the servo circuit 13 to drive the optical disc D by the CAV method (step Sa4), and executes the recording by the CAV method. When the recording in the CAV system is started, the control unit 16
Outputs to the laser power control circuit 20 information indicating an optimum target value of the laser power corresponding to the change in the linear velocity in order to increase the laser power in accordance with the increase in the linear velocity. As a result, the laser power control circuit 20
The laser power is feedback-controlled so as to reach the target value supplied from 6.

Further, the control unit 16 controls the address detection circuit 1
Optical disk D based on the address information detected from
It is determined whether the linear velocity at the recording position has reached the maximum recordable velocity obtained as described above (step Sa4). Here, when it is determined that the linear velocity at the recording position has not reached the maximum recordable velocity, the control unit 16 continues recording in the CAV method, and terminates the recording processing when all data to be recorded is recorded. Yes (the determination “YE
S "). On the other hand, if it is determined in step Sa4 that the linear velocity at the recording position has reached the maximum recordable velocity,
The control unit 16 outputs to the servo circuit 13 a control signal for instructing switching of the recording method from the CAV method to the CLV method, and executes recording in the CLV method (step Sa).
6).

Thereafter, when recording is performed in the CLV system, the control section 16 determines whether or not the recording has been completed (step Sa7). If all the data to be recorded has been recorded or if the user has instructed to terminate the recording, the determination is “YES”, and the recording process ends.

In the present embodiment, test recording is performed prior to the actual data recording processing, and the maximum recording speed at which good recording can be obtained on the optical disc D is obtained from the reproduction signal in the test recorded area. Can be. In the actual recording, CAV recording is performed until the obtained maximum recording speed is reached, and after reaching the maximum recording speed, CLV recording is performed at that speed, so that good recording quality can be maintained for a short time. Can be recorded. Therefore, if the user gives a recording instruction without paying attention to the recording speed corresponding to the optical disc D and the compatibility between the optical disc D and the optical disc recording / reproducing apparatus, the recording is automatically performed in a short time with good recording quality. You can do it.

C. Modifications The present invention is not limited to the above-described embodiment, and various modifications as exemplified below are possible.

(Modification 1) In the above-described embodiment, CAV recording is performed until the maximum recording speed obtained according to the test recording result is reached, and CLV recording is performed after the maximum recording speed is reached. However, CLV recording may be performed from the beginning at a speed equal to or lower than the maximum recording speed.

Also, when the maximum recording speed determined as described above is 12 ×, and the user instructs CLV recording at 16 × speed, good recording cannot be performed with CLV recording at 16 × speed. The user may be notified to prompt the user to reset the recording speed. Further, when the recording speed set by the user is higher than the maximum recording speed obtained as described above, instead of prompting the user to reset the recording speed as described above, the recording speed lower than the automatically determined maximum recording speed is used. The recording speed may be changed and set, and recording may be performed at the changed and set recording speed. In this case, the time required for recording at the changed recording speed may be estimated, and the estimated time may be reported to the user.

(Modification 2) In the above-described embodiment, the maximum recording speed at which good recording is possible is determined. However, it is conceivable that the recording quality may deteriorate during low-speed recording (see FIG. 10). As described above, the range βm of the β value in which the C1 error value falls within the preferable range becomes smaller as the speed becomes lower. In such a case, as shown in FIG. 11, the minimum recording speed Vmi at which good recording can be performed is set to a speed that becomes a value (10 or more in the illustrated example) indicated by the β suitable value information.
What is necessary is just to obtain it as n.

At the time of actual recording when the minimum recording speed is obtained in this manner, as shown in FIG. 12, CLV recording at a recording speed higher than the obtained minimum recording speed (in the example shown, quadruple speed) is performed. Alternatively, when the linear velocity at the time of performing the CAV recording becomes higher than the minimum recording speed, the recording may be switched to the CAV recording.

(Modification 3) In the above-described embodiment, the recordable speed is determined based on the β value. However, the present invention is not limited to this. The recordable speed is determined based on the recording laser power value. It may be. in this case,
The control unit 16 controls the C supplied from the C1 error detection circuit 23.
From one error value, the relationship between the recording laser power value and the C1 error value as shown in FIG. 13A is obtained for each of a plurality of recording speeds. Here, when the recording laser power value is used as a reference instead of the β value as shown in the drawing, the recording power value increases as the recording speed increases. Therefore, when the recordable speed is obtained based on the recording laser power value, the above-mentioned characteristics for each speed and the optimum recording laser power values PL1, PL2, and PL3 for each speed obtained by OPC are used. Upper limit values PJ1 ', PJ of the power value at which the C1 error value is equal to or less than the reference value ("10" in the illustrated example).
2 ′, PJ3 ′ and lower limit values PK1 ′, PK2 ′, PK
The ratio of the difference between the optimum recording laser power value 3 ′ and the optimum recording laser power value, that is, the ratio (%) of the allowable power value from the optimum recording laser power value is determined. For example, the upper limit allowable range value PJ01 (%) for the recording speed V1 is obtained by the following equation. PJ01 =
(PJ1'-PL1) / PL1 * 100 In this way, as shown in FIG. 13B, the allowable upper limit range values PJ01, PJ02, PJ02 of the recording laser power at each recording speed are obtained.
PJ03 and allowable lower limit range values PK01, PK02, P
K03 is obtained, and the relationship between the allowable range of the recording laser power value and the recording speed as shown in FIG. 14 is obtained. What should I do?

(Modification 4) In the above-described embodiment, the recordable speed is determined based on the range of the β value in which the C1 error value is smaller than a predetermined value. As parameters related to quality,
Not only the C1 error but also other parameters may be used. For example, as shown in FIG. 15, a frame synchronization signal detection and counting circuit 140 is provided in place of the C1 error detection circuit 23, and a frame synchronization signal detection circuit 140a and a frame synchronization signal detection circuit are provided in place of the C1 error value. A counter circuit 140b for counting the number of detections of the frame synchronization signal detected by the circuit 140a may be provided, and the recordable speed may be obtained using the number of detections of the frame synchronization signal counted by the counter circuit 140b. Here, the frame synchronization signal detection circuit 140a and the counter circuit 140b perform the EFM demodulation of the reproduction signal in the test-recorded area, detect the EFM frame synchronization signal from the obtained signal, and perform the number of times of detection. And outputs the count result to the control unit 16.

In the method using the number of times of detection of the frame synchronization signal instead of the C1 error value, first, the number of times of detection of the frame synchronization signal supplied from the sync equal detection circuit 140 and the β value supplied from the β detection circuit 24 are FIG.
The relationship between the number of detections of the frame synchronization signal and the β value is acquired for each of a plurality of recording speeds as shown in FIG. And FIG.
As shown in FIG. 6B, each recording speed (V1, V2, V
For each 3), the upper limit value SPJ of the β value is within the range of the number of detections of the frame synchronization signal (90 or more in the illustrated example) capable of maintaining good recording quality previously obtained by experiment.
1, SPJ2, SPJ3 and lower limit values SPK1, SPK
2, SPK3 is determined, and a recording speed-β range characteristic indicating a relationship between the recording speed and a value βm indicating a range of β values is determined by using a function (a linear function in the illustrated example) determined in advance by an experiment. After the recording speed-β range characteristic is obtained as described above, the recording speed deriving unit 20 in the above-described embodiment is used.
As in the case of 5, the maximum recordable speed may be obtained.

As shown in FIG. 17, a jitter detection circuit 160 is provided in place of the C1 error detection circuit 23, and the jitter detection circuit 16 is provided in place of the C1 error value.
The recordable speed may be obtained using the jitter value detected by 0. Here, the jitter detection circuit 160
Is an equalizer, a slicer, and a PLL (phase-locked
loop) circuit and a jitter measuring device. The RF signal supplied from the RF amplifier 12 passes through an equalizer, and the signal passing through the equalizer is binarized by a slicer. Then, the binarized RF signal is supplied to both the PLL circuit and the jitter measuring device. In the PLL circuit,
A clock is generated from the binarized RF signal, and the generated clock is sent to a jitter measuring instrument. The jitter measuring device uses the clock and the binarized RF signal to calculate
The jitter, which is the standard deviation of the difference between the recorded pit and the reference length, is measured.

In the method using the jitter value instead of the C1 error value, first, the jitter value supplied from the jitter detection circuit 160 and the β value supplied from the β detection circuit 24 are used as shown in FIG. The relationship between the jitter value and the β value is acquired for each of a plurality of recording speeds. And FIG.
As shown in (b), each recording speed (V1, V2, V3)
In each case, the range of the jitter value that can maintain good recording quality previously determined by an experiment (in the illustrated example, the jitter value 3
5 or less).
2, JPJ3 and lower limit values JPK1, JPK2, JPK
Then, a recording speed-β range characteristic indicating the relationship between the recording speed and the value βm indicating the range of the β value is determined using a function (a linear function in the illustrated example) obtained in advance by experiment. After the recording speed-β range characteristic is obtained in this manner, similarly to the recordable speed deriving unit 205 in the above-described embodiment,
The maximum recordable speed may be obtained.

Also, as shown in FIG. 19, a deviation detection circuit 180 is provided in place of the C1 error detection circuit 23, and the deviation value detected by the deviation detection circuit 180 is used in place of the C1 error value. Alternatively, the recordable speed may be obtained by using the following method.
Here, the deviation detection circuit 180 includes an equalizer, a slicer, and a PLL circuit similar to the above-described jitter detection circuit 160, and further includes a clock supplied from the PLL circuit instead of the jitter measuring device, and a slicer. And a deviation measuring device for detecting a deviation (a difference between a recording pit and a reference length) from a binary RF signal supplied from the device.

In the method of using the deviation value in place of the C1 error value, first, the deviation value supplied from the deviation detection circuit 180 and the β value supplied from the β detection circuit 24 are used as shown in FIG. The relationship between the deviation value and the β value is acquired for each of a plurality of recording speeds. Then, as shown in FIG. 20 (b), for each recording speed (V1, V2, V3), the range of the jitter value (−20 in the illustrated example) capable of maintaining good recording quality previously determined by experiment. The upper limit values DPJ1, DPJ2, and DPJ3 and the lower limit values DPK1, DPK2, and DPK3 of the β value that satisfy ≦ (deviation value ≦ 20) are obtained, and a function (a linear function in the illustrated example) obtained in advance by experiment is used. A recording speed-β range characteristic indicating a relationship between the recording speed and a value βm indicating a range of the β value is obtained. Thus, the recording speed-β
After the range characteristic is obtained, the maximum recordable speed may be obtained similarly to the recordable speed deriving unit 205 in the above-described embodiment.

Further, instead of the C1 error value, the recordable speed may be obtained by using parameters such as the amplitude, modulation degree, and reflectance of the RF signal supplied from the RF amplifier 12 during reproduction of the test recording area. . Here, as shown in FIG. 21A, the relationship between the amplitude of the RF signal and the β value is such that the amplitude value increases as the β value increases, and the amplitude value saturates when it increases to some extent. Such characteristics are obtained for each of a plurality of types of recording speeds, and, similarly to the above-described embodiment, the upper limit and the lower limit of the β value that fall within the range of the amplitude of the RF signal obtained in advance by experiment are obtained for each recording speed.
Thereafter, a recordable speed can be obtained by the same method as in the above embodiment.

FIG. 21 shows the relationship between the modulation factor and the β value.
As shown in (b), the characteristic is similar to the amplitude of the RF signal. Such characteristics are obtained for each of a plurality of types of recording speeds, and the upper limit value and the lower limit value of the β value which fall within the range of the modulation degree obtained by experiment in advance are obtained for each recording speed, as in the above embodiment. Thereafter, a recordable speed can be obtained by the same method as in the above embodiment. Note that the modulation degree is such that the maximum value of the RF signal is Imax and the minimum value is Im.
In the case of in, the degree of modulation = (Imax−Imin) / I
max.

FIG. 21 shows the relationship between the reflectance and the β value.
As shown in (c), as the β value increases, the reflectance decreases, which is almost a linear function. Such characteristics are obtained for each of a plurality of types of recording speeds, and similarly to the above-described embodiment, the upper limit and the lower limit of the β value that fall within the range of the reflectance previously obtained by experiment are obtained for each recording speed. After this,
The recordable speed can be obtained by the same method as in the above embodiment. The reflectance can be obtained by averaging the RF signal through a low-pass filter.

In the above example, the relationship between each parameter used in place of the C1 error value and the β value is determined to determine the recordable speed. However, as described in the above-described modification, The relationship between each parameter and the recording laser power value may be determined to determine the recordable speed.

Further, using a plurality of parameters (for example,
C1 error value and jitter value), and the recordable speed may be obtained. For example, when obtaining the maximum recording speed, the smaller one of the recording speeds obtained using both parameters is adopted as the maximum recording speed, and when obtaining the minimum recording speed, the recording speed obtained using both parameters is used. The larger one of the speeds may be adopted as the minimum recording speed.

(Modification 5) In the above-described embodiment, the case where the CD-R is used as the optical disk D has been described as an example.
R, DVD-RAM (DVD-Random Access Memory) and the like can also be applied to recording.

(Modification 6) In the above-described embodiment, the maximum recordable speed obtained according to the result of the test recording is used (for example, when the speed is reached, the maximum recording speed is changed from CAV to CL).
V, etc.) to record.
When it is determined that the optical disc D set in the optical disc recording / reproducing apparatus cannot perform recording at the linear velocity set by the user or the like, test recording is not performed, and the linear velocity is set to a linear velocity lower than the set velocity. The recording speed may be automatically changed to perform the recording. Specifically, each of the plurality of disc types and the maximum recordable linear velocity are stored in advance in a ROM or the like of the control unit 16 based on the results obtained by experiments and the like. When the optical disc D is set, the control unit 16 obtains disc type information by reading information described in the lead-in area or the like, and obtains the disc type information from the obtained information and the above storage contents. The maximum recordable speed of the set optical disc D is ascertained. Then, the grasped maximum speed is compared with the recording linear velocity set by the user or the like (which may be a CLV set speed or a switching speed from CAV to CLV) and grasped. When the maximum speed is small, the control unit 16 does not perform the OPC including the test record,
The recording is executed with the determined maximum speed as the set speed. By doing so, it is possible to perform recording with few errors on the optical disc D where it is apparent that recording at a preset speed is impossible, without taking time such as performing test recording. Can be.

(Modification 7) In the above-described embodiment, test recording or the like is performed to derive the maximum recording linear velocity to perform recording irrespective of the type of the optical disc D set. However, depending on the type of the optical disc D, good recording cannot be performed even if any control is performed. In order to prevent the recording from being performed when the optical disc D is set, if a certain type of optical disc D is set, the optical disc D is ejected without performing any recording processing. The recording may be prohibited to notify the user of a warning or the like, or both may be performed. Specifically, the type of the optical disc on which good recording cannot be performed as described above is stored in advance in a ROM or the like of the control unit 16 based on a result obtained in advance by an experiment or the like. And the optical disk D
Is set, the control unit 16 acquires the disc type information by reading the information described in the lead-in area. The type of the obtained optical disk is ROM
If it is included in the type of non-recordable optical disk stored in the optical disk D, the control unit 16 controls an optical disk tray drive mechanism (not shown) to eject the optical disk D set therein, and displays a display screen (not shown). Control to display a warning message on the monitor, and control to generate a warning sound by driving an alarm sound generator (not shown) to warn the user that the disc is a non-recordable disc.
By doing so, it is possible to prevent recording on the optical disc D for which good recording cannot be performed even if various controls are performed.

(Modification 8) The control unit 16 that executes the recording process including the above-described process of determining the recordable speed.
May be configured by a dedicated hardware circuit, or configured by a CPU (Central Processing Unit) or the like, and by executing a program stored in a storage unit such as a ROM (Read Only Memory). The processing may be realized by software. In the case where the above processing is performed by software as described above, a CD that records a program for causing a computer to perform the above processing is provided.
-Various recording media such as a ROM and a floppy (registered trademark) disk may be provided to the user, or may be provided to the user via a transmission medium such as the Internet.

[0060]

As described above, according to the present invention,
When performing recording on a certain optical disk, it is possible to determine the range of the recording speed at which good recording with few recording errors can be realized.

[Brief description of the drawings]

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

FIG. 2 is a diagram for explaining an area on an optical disk where test recording is performed by the optical disk recording / reproducing apparatus.

FIG. 3 is a block diagram showing a functional configuration of a control unit which is a component of the optical disc recording / reproducing apparatus.

FIG. 4 is a diagram for explaining a method of deriving a maximum recordable speed by the control unit.

FIG. 5 is a diagram for explaining storage contents of a C1 error preferred value information storage unit which is a component of the control unit.

FIG. 6 is a diagram for explaining a method of deriving a maximum recordable speed by the control unit.

FIG. 7 is a diagram for explaining the storage contents of a β suitable value information storage unit which is a component of the control unit.

FIG. 8 is a diagram for explaining the timing of switching between the CAV system and the CLV system of the optical disk recording / reproducing apparatus.

FIG. 9 is a flowchart showing a process executed by the control unit when recording is performed by the optical disc recording / reproducing apparatus.

FIG. 10 is a diagram for explaining a method of deriving a minimum recordable speed by the control unit in a modification of the optical disc recording / reproducing apparatus.

FIG. 11 is a diagram for explaining a method of deriving a minimum recordable speed by the control unit in a modification of the optical disc recording / reproducing apparatus.

FIG. 12 is a diagram for explaining switching timing between a CAV system and a CLV system in a modification of the optical disk recording / reproducing apparatus.

FIG. 13 is a diagram for explaining another method of deriving the maximum recordable speed by the control unit.

FIG. 14 is a diagram for explaining another method of deriving the maximum recordable speed by the control unit.

FIG. 15 is a block diagram showing a configuration of another modified example of the optical disc recording / reproducing apparatus.

FIG. 16 is a diagram for explaining a method of deriving a maximum recordable speed by a control unit of another modification of the optical disc recording / reproducing apparatus.

FIG. 17 is a block diagram showing a configuration of another modification of the optical disc recording / reproducing device.

FIG. 18 is a diagram for explaining a method of deriving a maximum recordable speed by a control unit of another modification of the optical disc recording / reproducing apparatus.

FIG. 19 is a block diagram showing a configuration of still another modified example of the optical disc recording / reproducing device.

FIG. 20 is a diagram for explaining a method of deriving a maximum recordable speed by a control unit of still another modification of the optical disc recording / reproducing apparatus.

FIG. 21 is a graph showing a relationship between a parameter relating to recording quality that can be used for deriving a recordable speed by the optical disc recording / reproducing apparatus and a β value.

[Explanation of symbols]

10 optical pickup 11 spindle motor
12 RF amplifier, 13 servo circuit, 14 address detection circuit, 15 decoder, 16 control unit,
Reference numeral 22: envelope detection circuit, 23: C1 error detection circuit, 24: β detection circuit, 112: inner PCA
Area, 112a test area, 140a frame synchronization signal detection circuit, 140b counter circuit, 160
... Jitter detection circuit, 180... Deviation detection circuit, 200... C1 error preferred value information storage unit, 201
... Recording speed-β characteristic function storage unit, 202 .beta. Suitable value information storage unit, 203 .beta.-C1 error characteristic derivation unit, 2
04: Recording speed-β characteristic deriving unit, 205: Recordable speed deriving unit, D: Optical disk

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5D090 AA01 BB04 CC01 CC05 CC14 CC16 EE01 GG17 GG33 HH01 HH03 JJ12 LL08 5D119 AA23 AA41 BA01 DA01 DA09 HA19 HA61

Claims (13)

[Claims] 1. A test recording step for performing test recording on an optical disc prior to actual recording on the optical disc; a reproducing step for acquiring a reproduction signal of the test-recorded area on the optical disc; A first deriving step of obtaining, for each one or a plurality of recording speeds, a first recording characteristic indicating a relationship between a β value or a recording laser power value and a predetermined parameter relating to the quality of a recording state, based on the reproduced signal of Based on the first recording characteristics obtained for each of the one or more recording speeds, and first suitable value information indicating a value that can be taken by the predetermined parameter in order to perform good recording stored in advance. The relationship between the recording speed and the range in which the β value or the recording laser power value for taking the value indicated in the first preferred value information can be defined. A second deriving step for obtaining a second recording characteristic, a second recording characteristic, and a second value indicating a value that the β value or the recording laser power value can take for performing pre-stored good recording. A recording speed deriving step of obtaining a recordable speed at which a proper recording can be performed on the optical disk based on the second preferable value information. 2. The method according to claim 1, further comprising: determining the type of the optical disk. Selecting a disc corresponding to the disc type determined in the step, and in the recording speed deriving step, from among the plurality of second preferred value information recorded for each disc type,
2. The method according to claim 1, wherein a disc corresponding to the disc type determined in the determining step is selected. 3. The method according to claim 1, wherein the predetermined parameter includes at least one of the number of detections of a frame synchronization signal, a C1 error, a jitter, a deviation, a modulation factor, a reflectance, and an amplitude of a reproduction signal. 3. The method for determining a recording speed of an optical disk according to item 2. 4. An optical disk recording apparatus for recording information by irradiating a laser beam onto an optical disk, comprising: test recording means for performing test recording on the optical disk prior to actual recording on the optical disk; A reproducing means for obtaining a reproduced signal of the test-recorded area in the above-mentioned step; and a β value or a recording laser power value based on the reproduced signal of the test recording area reproduced by the reproducing means; A first deriving means for obtaining, for each of one or a plurality of recording speeds, a first recording characteristic indicating a relationship with the first parameter, and a first preferable value indicating a value which the predetermined parameter can take in order to perform good recording. First storage means for storing value information; first recording characteristics determined for each of the one or more recording speeds; Based on the stored first preferred value information, the recording speed and the β value for obtaining the value indicated by the first preferred value information or the range in which the recording laser power value can be taken. Second showing relationship
A second deriving unit for obtaining a recording characteristic of the second storage unit; a second storage unit for storing second suitable value information indicating a value that the β value or the recording laser power value can take for performing good recording; Recording speed deriving means for obtaining a recordable speed at which proper recording on the optical disc can be performed based on the recording characteristics of No. 2 and the second suitable value information stored in the second storage means. An optical disk recording device characterized by the above-mentioned. 5. The apparatus according to claim 1, further comprising: a disc type discriminating unit for discriminating a type of the optical disc;
The second storage means stores the second value information for each type of the disk.
The second deriving means stores the preferred value information of the disc determined by the disc type discriminating means from among the plurality of first preferred value information recorded for each disc type. The recording speed deriving means selects a disc corresponding to the disc type, from among the plurality of second suitable value information recorded for each disc type, disc type discriminated by the disc discriminating means. 5. The optical disk recording apparatus according to claim 4, wherein a device corresponding to the above is selected. 6. The apparatus according to claim 4, wherein the predetermined parameter includes at least one of the number of times of detection of a frame synchronization signal, C1 error, jitter, deviation, degree of modulation, reflectance, and amplitude of a reproduced signal. 6. The optical disk recording device according to 5. 7. A setting unit for setting a recording speed in accordance with a user's instruction; a recording speed set by the setting unit; and a recordable speed derived by the recording speed derivation unit. 7. The optical disc recording apparatus according to claim 4, further comprising a recording discriminating unit for discriminating whether or not recording at the recording speed is possible. 8. When the recording determination unit determines that recording is impossible, the recording speed set by the setting unit is set to a value within the recordable speed derived by the recording speed derivation unit. 8. The optical disc recording apparatus according to claim 7, further comprising a speed changing means for changing the speed. 9. A time estimating means for estimating a time required for recording when recording is performed at a speed changed by the speed changing means, and a notifying means for informing a user of the time estimated by the time estimating means. The optical disk recording device according to claim 8, further comprising: 10. A disk drive means for selectively executing both a constant linear speed mode for driving the optical disk at a constant linear speed and a constant angular speed mode for driving the optical disk at a constant angular speed when recording on the optical disk; 10. The drive mode control unit according to claim 4, further comprising: a drive mode control unit that controls a drive mode of the disk drive unit based on a recordable speed derived by the recording speed derivation unit. Optical disk recording device. 11. A disc type discriminating means for discriminating a type of the optical disc set in the apparatus, a speed information storing means corresponding to the type information of the optical disc and the maximum recordable speed information, and the speed information storage. Referring to the storage contents of the means, obtaining the maximum recordable speed based on the type of the optical disc determined by the disc type determination means, comparing the obtained maximum recordable speed with the set speed, and obtaining The recording apparatus according to claim 4, further comprising: a recording execution unit configured to execute recording with the acquired maximum recordable speed as a set speed when the maximum recordable speed obtained is lower than the set speed. Optical disk recording device. 12. A disc type discriminating means for discriminating a type of the optical disc set in the apparatus, a non-recordable disc storage means storing type information of an optical disc in which good recording cannot be performed in the apparatus, When the type of the optical disc determined by the discriminating means is included in the optical disc type information stored in the non-recordable disc storage means, a prohibition means for prohibiting execution of recording on the optical disc is further provided. The optical disk recording device according to claim 4, wherein 13. A disc type discriminating means for discriminating a type of the optical disc set in the apparatus, a non-recordable disc storage means storing type information of an optical disc in which good recording cannot be performed in the apparatus, When the type of the optical disk determined by the determination unit is included in the optical disk type information stored in the non-recordable disk storage unit, the optical disk further includes a notification unit that notifies the user of the fact. The optical disk recording device according to claim 4, wherein