JP2004030893A - Optical disk recording method and optical disk recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain recording with high quality by controlling a light beam to have a proper recording power at each point of time in the case of variably recording line velocity magnification in accordance with the radial direction position of an optical disk. <P>SOLUTION: The recording power y of a light beam is variably controlled according to a function y=ax+b, wherein x is the line velocity magnification. A fixed value depending on the type of disk is adopted for the value (a) of the function. Prior to recording of the optical disk, a test recording is conducted at a proper line velocity magnification to obtain a proper recording power at the line velocity magnification. The value b providing a solution of the function at the line velocity magnification by using the obtained recording power is obtained. In the case of the real recording, the proper recording power is obtained on the basis of the function in accordance with the line velocity magnification at each radial position and the light beam is controlled to have the obtained recording power. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a recording method and a recording apparatus for a recordable optical disc such as a CD-R (CD recordable) disc and a DVD-R (DVD recordable) disc, and a variable linear velocity magnification according to a radial position of the optical disc. In order to perform high-quality recording by controlling the correction amount of the recording strategy related to the irradiation time of the light beam to an appropriate value or controlling the light beam to an appropriate recording power at each time point. It was done.
[0002]
[Prior art]
As a recording method of a constant linear velocity (CLV) recording type optical disc such as a CD-R or a DVD-R, high-speed recording in which recording is performed at a linear velocity higher than a standard linear velocity (1x velocity) is sometimes used.
[0003]
[Problems to be solved by the invention]
In constant linear velocity recording, the spindle rotation speed becomes higher toward the inner circumference of the optical disk. This is particularly remarkable in the case of high-speed recording. For example, at 16 × speed, the innermost circumference becomes 8000 rpm or more. For this reason, in the recording on the inner peripheral side of the disk, the self-excited vibration of the drive becomes large (especially in the case of an eccentric disk), and pit formation becomes unstable. Also, when so-called on-the-fly writing, in which writing is performed from another CD-ROM drive to a CD-R drive without creating an image file on the hard disk at a high speed, the CD-ROM drive is played back at a constant rotational speed (CAV) at a high speed. There is a method in which the CD-R drive performs high-speed recording at a constant linear velocity to perform recording. At this time, the linear velocity of the CD-ROM drive in which the CAV reproduction is performed is about 32 times faster on the outer circumference than on the inner circumference. There is only a 16-times speed on the side, and data transfer cannot be performed in time for reproduction on the inner peripheral side, so that a so-called buffer underrun occurs and writing may fail.
[0004]
As a method for solving these problems, as shown in FIG. 2, a method of recording a CD-R by CAV on the inner peripheral side and by CLV on the outer peripheral side has been considered. That is, CAV recording is started at a rotational speed corresponding to, for example, a 12-times speed at the innermost peripheral position of the program area, and when the linear speed reaches, for example, 16-times speed at this rotational speed, CLV recording is performed at a 16-times speed thereafter. . By switching between CAV recording and CLV recording in this manner, the maximum number of revolutions is suppressed, self-excited vibration is suppressed, and failure of on-the-fly writing is prevented.
[0005]
In the method of performing recording by switching between CAV recording and CLV recording in this manner, the linear velocity changes during CAV recording, so that the optimum recording power of the recording light beam changes sequentially. In addition, as a recording strategy regarding the irradiation time of the recording light beam,
(N + k) T
Here, T: time corresponding to unit pit length
n: multiple of pit length to be formed with respect to unit pit length (natural number)
k: correction amount
Is used, but the appropriate value of the correction amount k also changes according to the linear velocity at the time of recording.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and in the case where the linear velocity magnification is variably recorded according to the radial position of the optical disc, the correction amount of the recording strategy relating to the irradiation time of the light beam is appropriately adjusted at each time. It is an object of the present invention to provide an optical disc recording method and a recording apparatus capable of performing high-quality recording by controlling the optical beam to an appropriate value or controlling the light beam to an appropriate recording power.
[0007]
[Means for Solving the Problems]
According to the recording method of the optical disk of the present invention, the irradiation time of the recording light beam is set according to the pit length to be formed.
(N + k) T
Here, T: time corresponding to unit pit length
n: multiple of pit length to be formed with respect to unit pit length (natural number)
k: correction amount
In the method of recording on an optical disc by controlling the linear velocity magnification, the recording power of the light beam is increased as the recording linear velocity magnification increases, and a predetermined linear velocity magnification is used as a boundary. If the speed magnification is lower than the speed magnification, the value of the correction amount k is changed in accordance with the linear speed magnification. If the speed magnification is higher than the speed magnification, the value of the correction amount k is fixed and recording is performed. That is, according to the experiment of the present inventor, as described later, when the recording power of the light beam is increased as the recording linear velocity magnification increases, the value of the correction amount k at which a good reproduction signal quality is obtained is: It was found that the change was large in the region where the recording linear velocity was relatively low, and was substantially constant in the region where the recording linear velocity was relatively high. Therefore, in the present invention, the value of the correction amount k is changed according to the linear speed magnification when the speed is lower than the predetermined linear speed magnification, and the value of the correction amount k is fixed when the speed magnification is higher than the predetermined speed. By performing the recording, high-quality recording can be performed. In this case, although the linear velocity magnification at the boundary slightly differs depending on the type of the optical disk (difference in dye used, difference in maker, etc.), it was found that the magnification can be set to about 8 × speed or higher (eg, 8 × speed, 10 × speed, etc.). . According to the present invention, when the recording is performed by changing the linear velocity only at the linear velocity magnification of the boundary or higher, the recording can be performed with the correction amount k fixed at a constant value. When the linear velocity magnification is variably recorded in accordance with the radial position of the optical disc and the linear velocity magnification at the boundary is a linear velocity magnification in the middle of the linear velocity magnification variable range, the linear velocity magnification is set to When the linear velocity magnification is less than the boundary linear velocity magnification, the correction amount k is changed in accordance with the linear velocity magnification. When the linear velocity magnification is greater than the boundary, the correction amount k can be fixed at a constant value.
[0008]
An optical disk recording method according to the present invention is a method of variably recording a linear velocity magnification according to a radial position of an optical disk, which is lower than a variable range of a linear velocity magnification used in actual recording prior to recording on an optical disk. Perform test recording at each of a plurality of linear velocity magnifications, find the appropriate recording power at each of the linear velocity magnifications, and set the characteristics of the appropriate recording power for the linear velocity magnification based on the appropriate recording powers determined for the plurality of linear velocity magnifications. Then, at the time of actual recording, an appropriate recording power value is obtained based on the characteristics according to the linear velocity magnification at each radial position, and the light beam is controlled to the obtained recording power value. According to the present invention, the test recording is performed at a plurality of linear velocity magnifications lower than the variable range of the linear velocity magnification used in the actual recording, so that the linear velocity magnification used in the actual recording is high. Even if there is, test recording can be performed at a relatively low rotational speed, self-excited vibration during test recording can be suppressed, appropriate recording power can be detected stably, and actual recording can be performed with high quality . An optical disk recording method according to the present invention is a method of variably recording a linear velocity magnification according to a radial position of an optical disk. Prior to recording on an optical disk, one linear velocity magnification within a variable range used in actual recording is used. Test recording is performed at one or more linear velocity magnifications lower than the variable range, and an appropriate recording power at each linear velocity magnification is determined, and a linear recording power is determined based on the appropriate recording power determined for the plurality of linear velocity magnifications. The characteristic of the appropriate recording power with respect to the speed magnification was set, and during the actual recording, the appropriate recording power value was determined based on the characteristic according to the linear velocity magnification at each radial position, and the light beam was determined. It controls the recording power value. According to the present invention, the test recording is performed at one linear velocity magnification within the variable range used in the actual recording and at one or more linear velocity magnifications lower than the variable range. Can perform test recording at a relatively low rotational speed, suppress self-excited vibration during test recording, stably detect an appropriate recording power, and perform high-quality recording in actual production. In addition, since test recording is performed at a linear velocity magnification within a variable range used for actual recording and at a linear velocity magnification lower than the variable range, test recording can be performed at linear velocity magnifications that are apart from each other. Can be set with a small error.
[0009]
Note that the characteristic of the appropriate recording power can be simply constituted by, for example, one linear function or one quadratic function or more. In the case of using one linear function, for example, the recording power y of the light beam is variably controlled according to the function y = ax + b according to the linear velocity magnification x, and is used in actual recording before recording on the optical disc. Test recording is performed at two linear velocity magnifications within the variable range to be performed and at a linear velocity magnification lower than the range (or at each of two linear velocity magnifications lower than the variable range used in actual recording). Recording is performed), an appropriate recording power is obtained at the two linear velocity magnifications, and the values of a and b are set so that the two recording powers are solutions of the function at the respective linear velocity magnifications. Sometimes, according to the linear velocity magnification at each radial position, the values of a and b are used to determine an appropriate recording power value based on the set function, and the light beam is controlled to the determined recording power value. Also It can be.
[0010]
An optical disk recording method according to the present invention is a method of variably recording a linear velocity magnification according to a radial position of an optical disk, wherein a recording power y of a light beam is varied according to a linear velocity magnification x according to a function y = ax + b. It is assumed that the value of a of the function is a fixed value corresponding to the disc type, and an appropriate linear velocity magnification, for example, a linear velocity magnification within a variable range used in actual recording, prior to recording on the optical disk. Alternatively, test recording is performed at a linear velocity magnification｝ outside the variable range (for example, below the variable range), an appropriate recording power at the linear velocity magnification is obtained, and the recording power is calculated by solving the function at the linear velocity magnification. In the actual recording, the appropriate recording power value is determined based on the function in which the values of a and b are set according to the linear velocity magnification at each radial position. Light beam And controls in order was the recording power value. An optical disk recording method according to the present invention is a method of variably recording a linear velocity magnification according to a radial position of an optical disk, wherein a recording power y of a light beam is varied according to a linear velocity magnification x according to a function y = ax + b. The value of a of the function is set to a fixed value according to the type of the disk, and two linear velocity magnifications (for example, one linear range within a variable range used in actual recording) are appropriately set before recording on the optical disk. Test recording is performed at a speed magnification and one linear velocity magnification lower than the variable range, or two linear velocity magnifications lower than the variable range used in actual recording, and an appropriate recording power at the both linear velocity magnifications is determined. The value of b at which the sum of squares of the error of the two recording powers obtained with respect to the solution of the function at the two linear velocity magnifications is minimized, and the linear velocity at each radial position during actual recording. According to magnification Te, the seeking appropriate recording power value based on the function value is set in a and b, and the light beam and controls the recording power value obtained said. According to the experiment of the present inventor, when the recording power y of the light beam can be variably controlled according to the linear velocity magnification x according to the function y = ax + b, the value of a of the function is set to a fixed value corresponding to the disc type. It has been found that the value of b can be set for each disc based on test recording at an appropriate linear velocity magnification. According to the present invention, by accurately determining and setting the value of a in advance, it is possible to reduce the measurement error of the value of a as compared with the case where both the values of a and b are determined by test recording. it can.
In the present invention, as a method of variably recording the linear velocity magnification according to the radial position of the optical disk, for example, by controlling the optical disk at a constant rotational speed, the linear velocity magnification is adjusted according to the radial position of the optical disk. Includes the case of changing sequentially. In this case, for example, the linear velocity at each time point is calculated based on the rotational speed of the constant rotational speed control and time information read from the wobble of the optical disc, and after the linear velocity reaches a predetermined value, the linear velocity is controlled to be constant on the outer peripheral side. Can be recorded.
[0011]
An optical disk recording apparatus according to the present invention includes a disk servo for driving an optical disk to rotate, an optical pickup for irradiating the optical disk with a light beam to perform recording and reproduction, and an optical power for controlling the power of the light beam emitted from the optical pickup. Control unit and the irradiation time of the recording light beam according to the pit length to be formed
(N + k) T
Here, T: time corresponding to unit pit length
n: multiple of pit length to be formed with respect to unit pit length (natural number)
k: correction amount
And a strategy part for controlling the recording power of the light beam with respect to the recording linear velocity magnification, as a characteristic of the recording power of the light beam as the recording linear velocity magnification increases. As a characteristic of the correction amount k, the value of the correction amount k changes according to the linear speed magnification when the linear speed magnification is less than the predetermined linear speed magnification as a boundary, and the value of the correction amount k is higher than the speed magnification. A storage unit for storing a fixed characteristic; and, when recording the optical disc, the light power control unit based on the recording power characteristic of the light beam stored in the storage unit in accordance with a recording linear velocity magnification. And a system control unit that controls the strategy unit to instruct the correction amount k based on the characteristic of the correction amount k stored in the storage unit. That. In this case, for example, the storage unit stores the characteristic of the correction amount k with respect to the recording linear velocity magnification for each disc type, and the system control unit determines the disc type and stores the disc type in the storage unit. A control for instructing the strategy unit to the correction amount k may be performed based on the corresponding characteristic among the characteristics of the correction amount k.
[0012]
An optical disk recording apparatus according to the present invention is an optical disk recording apparatus that variably records a linear velocity magnification in accordance with a radial position of an optical disk. The optical disk recording apparatus includes: a disk servo that rotationally drives the optical disk; An optical pickup for performing recording and reproduction, an optical power control unit for controlling the power of a light beam emitted from the optical pickup, and a predetermined parameter value relating to reproduction signal quality based on a reproduction signal detected by the optical pickup A signal quality detection unit; and a system control unit, wherein the system control unit is lower than a variable range of a linear velocity magnification used in actual recording in a predetermined test area prior to actual recording of the optical disc. Test recording is performed at each of a plurality of linear velocity magnifications, and the reproduction signal quality is determined based on the reproduction signal of each test recording. A recording power value at which a predetermined parameter becomes an appropriate value is obtained, and a characteristic of an appropriate recording power for the linear velocity magnification is set based on the appropriate recording power obtained for the plurality of linear velocity magnifications. In accordance with the linear velocity magnification at the directional position, an appropriate recording power value is determined based on the characteristic, and control is performed to instruct the optical power control unit with the determined recording power value.
[0013]
An optical disk recording apparatus according to the present invention is an optical disk recording apparatus that variably records a linear velocity magnification in accordance with a radial position of an optical disk. The optical disk recording apparatus includes: a disk servo that rotationally drives the optical disk; An optical pickup for performing recording and reproduction, an optical power control unit for controlling the power of a light beam emitted from the optical pickup, and a predetermined parameter value relating to reproduction signal quality based on a reproduction signal detected by the optical pickup A signal quality detection unit; and a system control unit, which, prior to the actual recording of the optical disc, performs a linear velocity multiplication within a variable range used in the actual recording in a predetermined test area. And test recording is performed at one or more linear velocity magnifications lower than the variable range, and the test recording is repeated. Based on the signal, a recording power value at which a predetermined parameter relating to reproduction signal quality becomes an appropriate value is obtained, and a characteristic of an appropriate recording power for the linear velocity magnification is set based on the appropriate recording power obtained for the plurality of linear velocity magnifications. During actual recording, a control is performed to determine an appropriate recording power value based on the characteristic according to the linear velocity magnification at each radial position and instruct the optical power control unit to the determined recording power value. Is what you do.
[0014]
An optical disk recording apparatus according to the present invention is an optical disk recording apparatus that variably records a linear velocity magnification in accordance with a radial position of an optical disk. The optical disk recording apparatus includes: a disk servo that rotationally drives the optical disk; An optical pickup for performing recording and reproduction, an optical power control unit for controlling the power of a light beam emitted from the optical pickup, and a predetermined parameter value relating to reproduction signal quality based on a reproduction signal detected by the optical pickup A signal quality detector and a function as a characteristic of a recording power y of the light beam with respect to a recording linear velocity magnification x;
y = ax + b
Where a is a fixed value according to the disc type
And a system control unit. The system control unit performs test recording at an appropriate linear velocity magnification in a predetermined test area prior to actual recording of the optical disc. On the basis of the reproduction signal of the test recording, a recording power value at which a predetermined parameter relating to the reproduction signal quality becomes an appropriate value is obtained, and the value of b at which the recording power is a solution of the function at the linear velocity magnification is obtained. At the time of recording, an appropriate recording power value is obtained based on the function according to the linear velocity magnification at each radial position, and control is performed to instruct the optical power control unit to the obtained recording power value. Things.
[0015]
An optical disk recording apparatus according to the present invention is an optical disk recording apparatus that variably records a linear velocity magnification in accordance with a radial position of an optical disk. The optical disk recording apparatus includes: a disk servo that rotationally drives the optical disk; An optical pickup for performing recording and reproduction, an optical power control unit for controlling the power of a light beam emitted from the optical pickup, and a predetermined parameter value relating to reproduction signal quality based on a reproduction signal detected by the optical pickup A signal quality detector and a function as a characteristic of a recording power y of the light beam with respect to a recording linear velocity magnification x;
y = ax + b
Where a is a fixed value according to the disc type
And a system control unit. The system control unit performs test recording at an appropriate two linear velocity magnifications in a predetermined test area prior to actual recording of the optical disc. Based on the reproduction signal of the test recording, a recording power value at which a predetermined parameter relating to the reproduction signal quality becomes an appropriate value is obtained, and a square of an error between the obtained recording power and the solution of the function at the both linear velocity magnifications. Determine the value of b where the sum is the minimum, during actual recording, according to the linear velocity magnification at each radial position, determine the appropriate recording power value based on the function, for the optical power control unit, The control for instructing the obtained recording power value is performed.
[0016]
An optical disk recording apparatus according to the present invention is an optical disk recording apparatus that variably records a linear velocity magnification in accordance with a radial position of an optical disk. The optical disk recording apparatus includes: a disk servo that rotationally drives the optical disk; An optical pickup for performing recording and reproduction, an optical power control unit for controlling the power of a light beam emitted from the optical pickup, and a predetermined parameter value relating to reproduction signal quality based on a reproduction signal detected by the optical pickup A signal quality detector and a function as a characteristic of a recording power y of the light beam with respect to a recording linear velocity magnification x;
y = ax²+ Bx + c
Where a and b are fixed values according to the disc type.
And a system control unit. The system control unit performs test recording at an appropriate linear velocity magnification in a predetermined test area prior to actual recording of the optical disc. Based on the reproduction signal of the test recording, a recording power value at which a predetermined parameter relating to the reproduction signal quality becomes an appropriate value is obtained, and the value of c at which the recording power is a solution of the function at the linear velocity magnification is obtained. At the time of recording, an appropriate recording power value is obtained based on the function according to the linear velocity magnification at each radial position, and control is performed to instruct the optical power control unit to the obtained recording power value. Things.
[0017]
An optical disk recording apparatus according to the present invention is an optical disk recording apparatus that variably records a linear velocity magnification in accordance with a radial position of an optical disk. The optical disk recording apparatus includes: a disk servo that rotationally drives the optical disk; An optical pickup for performing recording and reproduction, an optical power control unit for controlling the power of a light beam emitted from the optical pickup, and a predetermined parameter value relating to reproduction signal quality based on a reproduction signal detected by the optical pickup A signal quality detector and a function as a characteristic of a recording power y of the light beam with respect to a recording linear velocity magnification x;
y = ax²+ Bx + c
Where a and b are fixed values according to the disc type.
And a system control unit. The system control unit performs test recording at an appropriate two linear velocity magnifications in a predetermined test area prior to actual recording of the optical disc. Based on the reproduction signal of the test recording, a recording power value at which a predetermined parameter relating to the reproduction signal quality becomes an appropriate value is obtained, and a square of an error between the obtained recording power and the solution of the function at the both linear velocity magnifications. Determine the value of c that minimizes the sum, at the time of actual recording, according to the linear velocity magnification at each radial position, determine an appropriate recording power value based on the function, for the optical power control unit, The control for instructing the obtained recording power value is performed.
[0018]
In the optical disk recording apparatus of the present invention, for example, the storage unit stores the characteristic of the recording power y of the light beam with respect to the recording linear velocity magnification x for each disk type. And controlling to instruct the recording power y of the light beam based on the corresponding characteristic of the recording power y of the light beam stored in the storage unit. Further, for example, the system control unit drives the disk servo at a constant rotational speed on the inner peripheral side with an appropriate radial position of the optical disk as a boundary, and on the outer peripheral side, the linear velocity in the constant rotational speed control. A command to drive the linear velocity constant at the final magnification value may be issued. Further, the optical disc recording apparatus of the present invention further comprises a time information reading unit for reading time information from the wobble of the optical disc, wherein the system control unit is configured to read from the wobble of the optical disc and the rotation speed of the constant rotation speed control. The linear velocity at each time point is calculated based on the time information, and after the linear velocity reaches a predetermined value, the linear velocity is controlled to be constant on the outer peripheral side and recorded.
[0019]
In the present invention, test recording can be performed, for example, by using a PCA (Power Calibration Area: power calibration area) on the innermost circumference of the disc. Further, the present invention can be applied to the recording of a dye-based write-once type constant linear velocity optical disk such as a CD-R disk and a DVD-R disk, and various optical disks to which the present invention can be applied.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below. Here, a case will be described in which the present invention is applied when recording a CD-R disc by switching between CAV recording and CLV recording according to its radial position. FIG. 3 shows the area division of the CD-R disc. In the optical disc 10 (CD-R disc), a section having a diameter of 46 to 50 mm is prepared as the lead-in area 14, and a PCA area (Power Calibration Area: power calibration area) 12 is provided on the inner side of the section. The PCA area 12 includes a test area 12a and a count area 12b. In the test area 12a, test recording of OPC (Optimum Power Control: adjustment of optimum recording power of recording beam) is performed. In this test recording, for example, one test recording is performed by changing the recording power in 15 steps, and an EFM signal for one subcode frame (not limited to this) is recorded for one recording power, and a total of 15 subcodes are recorded. This is performed by recording EFM signals for frames. The test area 12a is assigned a capacity (for example, 1500 subcode frames) for performing this test recording for, for example, 100 times (the test recording is performed once in one OPC, and thus 100 times for OPC). The EFM signal for one subcode frame is recorded in the count area 12b every time the OPC is performed. The count area 12b is allocated the same number of OPC times as the test area 12a (for example, 100 subcode frames for 100 OPCs). When performing the OPC, it is detected in advance how far the EFM signal in the count area 12b has been recorded, and it is determined where in the test area 12a the current test recording should be performed.
[0021]
A program area 18 is provided adjacent to the lead-in area 14 and on the outer peripheral side thereof. In the wobble of the track (pre-groove) in the entire information area 16, time information and the like are recorded as ATIP information. The ATIP time information records a value that is continuous (simply increases) from the start position of the program area 18 to the outer peripheral end of the information area 16 on the outer peripheral side, and is stored in the information area 16 on the inner peripheral side. A value that is continuous (simply decreases) up to the peripheral end is recorded. The lead-out area is formed immediately after the end of the program area 18 (the position where the recording is closed).
[0022]
FIG. 1 shows an embodiment of an optical disk recording apparatus according to the present invention. The optical disk 10 (CD-R disk) is driven to rotate by a spindle motor 24. The rotation speed of the spindle motor 24 is detected by a frequency generator 26. The optical pickup 28 irradiates the optical disk 10 with a light beam (laser light) to record and reproduce information. The return light receiving signal (EFM signal) of the optical pickup 28 is supplied to the RF amplifier 30. The ATIP detection circuit 32 extracts a wobble signal component from the EFM signal and decodes ATIP information included in the wobble signal component. The ATIP information includes time information (address information) of each position and identification information (disk ID) indicating a disk type. The β value detection circuit 34 calculates a β value (asymmetry value) from the EFM signal waveform as a parameter relating to the reproduction signal quality. The β value is obtained by (a + b) / (ab) where a is the peak level (sign is +) of the reproduced EFM signal waveform and b is the bottom level (sign is −). The envelope detection circuit 36 detects the envelope of the EFM signal. This envelope detection is used to detect how far the EFM signal has been recorded in the count area 12b (FIG. 3) in advance when performing OPC. The decoder 38 performs EFM demodulation on the EFM signal to obtain reproduced data.
[0023]
The servo circuit 40 controls the rotation of the spindle motor 24 and controls the focus, tracking, and feed of the optical pickup 28. The control of the spindle motor 24 is performed by switching between CAV control and CLV control according to the radial position. The CAV control is performed by controlling the spindle motor 24 such that the rotation speed detected by the frequency generator 26 matches the set rotation speed. The CLV control is performed by controlling the spindle motor 24 so that the wobble signal detected from the EFM signal has a set linear velocity magnification. The laser driver 42 drives a laser source in the optical pickup 28. The optical power control circuit 44 controls the laser driver 42 to control the laser power during recording (during test recording and actual recording) and during reproduction. The recording data is EFM-modulated by the encoder 46, the time axis is corrected by the strategy circuit 48, and the laser drive signal of the laser driver 42 is modulated. By driving the laser source of the optical pickup 28 with the modulated laser drive signal, information is recorded. During reproduction, the laser driver 42 drives the laser source of the optical pickup 28 with a predetermined reproduction power.
The memory 52 is composed of a flash ROM or the like, and stores, for each disk ID, the characteristics of the correction value k of the recording strategy with respect to the recording linear velocity magnification and the characteristics of the recording power with respect to the recording linear velocity magnification. These characteristic information can be updated by downloading.
[0024]
A system control circuit 50 (CPU) controls the entire optical disk recording device. The system control circuit 50 relates to the present invention, and particularly performs the following control.
(A) The type of the disc is determined based on the disc ID detected by the ATIP detection circuit 32, and the corresponding characteristic among the characteristics of the correction amount k of the recording strategy stored in the memory 52 and the characteristics of the recording power of the light beam. Is specified.
(B) Prior to the actual recording of the optical disk 10, test recording is performed in the PCA area 12, and based on a reproduction signal of the test recording, a recording power value at which the β value detected by the β value detection circuit 34 becomes an appropriate value is determined. Then, based on this measurement, an undetermined constant in the characteristic function of the recording power of the light beam is set.
(C) At the time of actual recording, the linear speed magnification at each time point is determined based on the commanded rotation speed of the rotation speed constant control (the rotation speed upper limit value preset in the drive, etc.) and the time information detected by the ATIP detection circuit 32. The servo circuit 40 performs a constant rotation speed drive at the command rotation speed on the inner peripheral side before the linear speed magnification reaches the command linear speed magnification (linear speed magnification commanded by the user or the like) to the servo circuit 40. After the linear velocity magnification reaches the command linear velocity magnification, a constant linear velocity drive is commanded on the outer peripheral side at the command linear velocity magnification. In this case, the linear velocity magnification V at each point in time is obtained, for example, by the following equation.
[0025]
V = 2πR · V_CAV/ V_CLV
Where R is the radius value of the position
V_CAV: Command speed for constant speed control
V_CLV: Disc-specific linear velocity
In the above equation, the radius value R at the corresponding position is obtained by, for example, the following equation.
R = ｛(TPPV_CLV/ Π) + R₀ ²｝^1/2
Here, T: ATIP time information of the corresponding position
P: Track pitch specific to the disc
R₀: Inner radius of the program area
For example, P = 1.6 μm, V_CLV= 1.2 m / sec._CAV= 6000 rpm, assuming CAV driving, the radius value R at the position of T = 5:00:00 frame is:
R = [｛(5 · 60) · (1.6 · 10^-3) ・ (1.2 ・ 10³) / Π｝ +25²]^1/2= 28.43mm
Therefore, the linear velocity magnification V at that position is
V = 2π · 28.43 · (6000/60) / (1.2 · 10³) = 14.88x speed
Is obtained as Note that the linear velocity V specific to the disc_CLVFor example, the value of the track pitch P unique to the disc is obtained by inserting the optical disc 10 into the optical disc recording apparatus and measuring it before actual recording, or by storing these values for each disc type in the memory 52. be able to.
(D) At the time of actual recording, the recording power of the light beam is commanded to the light power control circuit 44 based on the characteristic of the recording power of the light beam according to the recording linear velocity magnification, and based on the characteristic of the correction amount k of the recording strategy. The correction amount k is instructed to the strategy circuit 48.
[0026]
If the optical disc 10 is of a disc type not stored in the memory 52, the system control circuit 50 performs test recording for at least two linear velocity magnifications and obtains the overall characteristics of the recording power of the light beam with respect to the recording linear velocity magnification. Set. At this time, as for the correction amount k of the recording strategy, for example, a standard characteristic is stored in the memory 52 and used.
[0027]
The adjustment of the correction amount of the irradiation time of the recording light beam by the optical disk recording apparatus of FIG. 1 will be described. The strategy circuit 48 sets the irradiation time of the recording light beam to (n + k) T according to the bit length to be formed.
Here, T: time corresponding to unit pit length
n: multiple of pit length to be formed with respect to unit pit length (natural number from 3 to 11)
k: correction amount
To control. FIG. 4 shows a correction in which characteristics such as C1 error and jitter of a reproduced signal become good when recording is performed while changing the recording linear velocity magnification while maintaining the power of the recording light beam (recording power) appropriately. It shows the range of the amount k (region indicated by hatching). According to this, when the recording linear velocity magnification is about 8 magnifications as a boundary, the range of the appropriate k value with respect to the recording linear velocity magnification fluctuates greatly. It can be seen that the range of the k value does not change much. FIG. 5 shows a characteristic example of the correction amount k by the strategy circuit 48 when the optical disk having the characteristic of FIG. 4 is used. In the characteristics shown in FIG. 5, the correction amount k is changed linearly (or may be curved) according to the recording linear velocity magnification below 8 × speed, and a constant value above 8 × speed. kc. The characteristic of the correction amount k for each disk type is stored in the memory 52 in advance, and the characteristic corresponding to the detected disk ID is read and used.
[0028]
FIGS. 6 to 8 show changes in the linear velocity magnification and the correction amount k with respect to the position in the disk radial direction when recording is performed by switching between CAV recording and CLV recording using the characteristic of the correction amount k in FIG. FIG. 6 shows the case where the linear velocity magnification of CAV recording is always 8 times or less (Vi indicates the initial value of the linear velocity magnification of CAV recording, and Ve indicates the final value of the linear velocity magnification). Varies over the entire CAV recording area. FIG. 7 shows a case where the linear velocity magnification of the CAV recording changes across the 8 × speed. At this time, the correction amount k is fixed to a constant value kc after reaching the 8 × speed. FIG. 8 shows a case where the linear velocity magnification of CAV recording is always equal to or higher than 8 × speed. At this time, the correction amount kc is fixed to a constant value kc over the entire program area.
[0029]
Next, the power control of the recording light beam by the optical disk recording apparatus of FIG. 1 will be described. Here, recording is performed while changing the recording linear velocity magnification as shown in FIG. That is, the linear velocity magnification for CLV recording is set to Ve (linear velocity magnification instructed by the user or the like), and the rotation speed is commanded by the linear velocity magnification Ve in the program area 18 (the rotational velocity preset in the drive). CAV recording is performed at the commanded rotation speed for an area on the inner peripheral side that is equal to or larger than the upper limit value. The initial value of the linear velocity magnification of the CAV recording is Vi, and the final value of the linear velocity magnification is Ve. FIG. 9B shows the change in the recording power of the light beam at this time. In the CAV recording area, the recording power increases as the linear velocity magnification increases (the recording power at the initial linear velocity magnification value Vi is Pi, and the recording power at the final linear velocity magnification value Ve is Pe). It becomes constant at Pe.
[0030]
A specific example of how to determine the recording power characteristic with respect to the recording linear velocity magnification when recording is performed by controlling the recording linear velocity magnification and recording power as shown in FIG. 9 will be described.
[Example 1] Example in which a super cyanine-based CD-R disc of Company A (hereinafter referred to as "Disc A") is used
FIG. 10 shows the characteristics of the β value of the reproduced RF signal with respect to the recording power when recording was performed using the disk A at various linear velocity magnifications with various recording powers. FIG. 11 shows a characteristic of a C1 error with respect to a β value when the reproduction RF signal is subjected to EFM demodulation. FIG. 12 shows the characteristics of the pit jitter with respect to the β value of the reproduced RF signal. FIG. 13 shows the characteristics of the recording power with respect to the recording linear velocity magnification for each β value obtained by developing the characteristics of FIG. According to FIG. 13, the characteristic of the recording power with respect to the linear velocity magnification when recording while maintaining the β value at a predetermined value is a linear function.
y = ax + b
Where y: recording power
x: linear velocity magnification
Can be approximated by According to FIGS. 11 and 12, in the case of the disk A, the power margin is sufficiently wide even at the time of high-speed recording (the range of the β value is large when the C1 error and the pit jitter are low). The target value of β value (target β) can be set to a constant value. Therefore, if the target value of the β value is set to be constant at, for example, 5%, the values of the a (slope) and b (y intercept) of the characteristic function y = ax + b of the recording power with respect to the recording linear velocity magnification are obtained from FIG. It can be seen that 1.8258 and b = 3.8579 can be set.
[0031]
The characteristics shown in FIG. 10 are for the case where the wavelength of the light beam is 787 nm. Since the wavelength of the light beam is slightly different for each drive, it is necessary to consider the influence of this difference in wavelength. FIG. 14 shows the characteristics of the β value of the reproduced RF signal with respect to the recording power when recording was performed on the disk A by changing the recording power at various linear velocity magnifications using a drive having a light beam wavelength of 783.7 nm. Show. FIG. 15 shows the characteristics of the recording power with respect to the recording linear velocity magnification for each β value, obtained by developing the characteristics of FIG. According to FIG. 15, the values of a and b of the function y = ax + b when the β value is 5% are a = 1.8244 and b = 3.1841. When these values are compared with the values of a and b when the β value shown in FIG. 13 is 5%, the value of a is almost equal, and the value of b changes relatively largely. Therefore, from this result, it can be seen that the value of a is fixed and only the value of b needs to be changed even if the wavelength of the light beam is slightly different. Therefore, y = ax + b (a is fixed, b is undecided) is previously stored in the memory 52 as a characteristic function of the recording power with respect to the recording linear velocity magnification for the disk A, and the test recording (OPC) is performed before the actual recording. To set the value of b.
[0032]
A specific example of a method of obtaining and setting the value of b in test recording will be described.
(Method of FIG. 16)
OPC is performed at an appropriate linear velocity magnification V1 within the variable range (Vi to Ve) or outside the variable range (for example, below the variable range) used in the actual recording, and the linear velocity magnification V1 is used. Of the recording power P1 (recording power at which the set target β value is obtained) is obtained, and the value of b at which the recording power P1 is a solution of the characteristic function y = ax + b at the linear velocity magnification V1 is obtained and set. .
[0033]
(Method of FIG. 17)
Two linear velocity magnifications V1 and V2 lower than the linear velocity magnification variable range (Vi to Ve) used during actual recording (for example, when Vi = 10 ×, Ve = 16 ×, V1 = 4 ×, V2 = OPC is performed at 8 × speed, etc., and appropriate recording powers (recording powers for obtaining a set target β value) P1 and P2 at these linear velocity magnifications V1 and V2 are obtained, and P1 and P2 for the characteristic function y = ax + b are obtained. The value of b that minimizes the sum of squares of the error is determined and set by the least square method. Alternatively, the OPC may be performed at three or more linear velocity magnifications lower than the variable range (Vi to Ve) of the linear velocity magnification used in the actual recording, and the value of b may be similarly obtained and set by the least square method. it can.
[0034]
(Method of FIG. 18)
One linear velocity magnification V1 lower than the linear velocity magnification variable range (Vi to Ve) used during actual recording and one linear velocity magnification V2 within the range (for example, Vi = 10 ×, Ve = 16 ×) In this case, OPC is performed at V1 = 8 × speed, V2 = 12 × speed, etc.), and appropriate recording powers (recording powers for obtaining the set target β value) P1 and P2 at these linear velocity magnifications V1 and V2 are obtained. The value of b that minimizes the sum of the squares of the errors of P1 and P2 with respect to the characteristic function y = ax + b is obtained and set by the least square method. Alternatively, OPC is performed with two or more linear velocity magnifications lower than the variable range (Vi to Ve) of the linear velocity magnification used in the actual recording and one linear velocity magnification within the range, and the least square method is similarly performed. The value of b can be determined and set.
[0035]
[Example 2] Example of using a cyanine-based CD-R disc of Company B (hereinafter referred to as "Disc B")
FIG. 19 shows the characteristics of the β value of the reproduced RF signal with respect to the recording power when recording was performed by using the disk B with various recording powers at various linear velocity magnifications. FIG. 20 shows a characteristic of a C1 error with respect to a β value when the reproduction RF signal is subjected to EFM demodulation. FIG. 21 shows the characteristics of the pit jitter with respect to the β value of the reproduced RF signal. FIG. 22 shows the characteristics of the recording power with respect to the recording linear velocity magnification for each β value obtained by developing the characteristics of FIG. According to FIG. 22, the characteristic of the recording power with respect to the linear velocity magnification when recording while maintaining the β value at a predetermined value is a linear function.
y = ax + b
Where y: recording power
x: linear velocity magnification
Can be approximated by However, according to FIGS. 20 and 21, in the case of the disc B, the power margin at the time of high-speed recording is narrow (the range of the β value when the C1 error and the pit jitter are low) is narrow. It is desirable to change the target value. The thick line in FIG. 22 shows an example of the characteristic of the recording power with respect to the recording linear velocity magnification when the β value is changed so that the C1 error and the pit jitter are kept small according to the recording linear velocity magnification. This property is a quadratic function
y = ax²+ Bx + c
In this example, a = −0.0217, b = 1.8169, and c = 4.408. However, the value of c changes relatively largely according to the wavelength of the light beam. Therefore, y = ax is stored in the memory 52 as a characteristic function of the recording power with respect to the recording linear velocity magnification for the disk B.²+ Bx + c (a and b are fixed, c is undecided) is stored in advance, and test recording (OPC) is performed prior to the actual recording to set the value of c.
[0036]
A specific example of a method of obtaining and setting the value of c in test recording will be described.
(Method of FIG. 23)
OPC is performed at an appropriate linear velocity magnification V1 within the variable range (Vi to Ve) or outside the variable range (for example, below the variable range) used in the actual recording, and the linear velocity magnification V1 is used. Is determined, and the recording power P1 is determined by the characteristic function y = ax at the linear velocity magnification V1.²The value of c, which is the solution of + bx + c, is determined and set.
[0037]
(Method of FIG. 24)
Two linear velocity magnifications V1 and V2 lower than the linear velocity magnification variable range (Vi to Ve) used during actual recording (for example, when Vi = 10 ×, Ve = 16 ×, V1 = 4 ×, V2 = OPC is performed at 8 × speed, etc., and appropriate recording powers (recording powers at which target β values set for the respective linear speed magnifications V1 and V2 are obtained) P1 and P2 are obtained at these linear speed magnifications V1 and V2. Characteristic function y = ax²The value of c that minimizes the sum of the squares of the errors of P1 and P2 with respect to + bx + c is determined and set by the least square method. Alternatively, OPC may be performed at three or more linear velocity magnifications lower than the variable range (Vi to Ve) of the linear velocity magnification used at the time of actual recording, and the value of c may be similarly obtained and set by the least square method. it can.
[0038]
(Method of FIG. 25)
One linear velocity magnification V1 lower than the linear velocity magnification variable range (Vi to Ve) used during actual recording and one linear velocity magnification V2 within the range (for example, Vi = 10 ×, Ve = 16 ×) In this case, OPC is performed at V1 = 8 × speed, V2 = 12 × speed, etc., and an appropriate recording power at each of these linear velocity magnifications V1 and V2 (a target β value set for each of the linear velocity magnifications V1 and V2) is obtained. Recording power) P1 and P2 are obtained, and the characteristic function y = ax²The value of c that minimizes the sum of the squares of the errors of P1 and P2 with respect to + bx + c is determined and set by the least square method. Alternatively, OPC is performed with two or more linear velocity magnifications lower than the variable range (Vi to Ve) of the linear velocity magnification used in the actual recording and one linear velocity magnification within the range, and the least square method is similarly performed. The value of c can be determined and set.
[0039]
[Example 3] Example in which a phthalocyanine-based CD-R disc of Company C (hereinafter referred to as "Disc C") is used.
FIG. 26 shows the characteristics of the β value of the reproduced RF signal with respect to the recording power when recording was performed using the disk C with various recording powers at various linear velocity magnifications. FIG. 27 shows characteristics of a C1 error with respect to a β value when the reproduction RF signal is subjected to EFM demodulation. FIG. 28 shows the characteristics of the pit jitter with respect to the β value of the reproduced RF signal. FIG. 29 shows the characteristics of the recording power with respect to the recording linear velocity magnification for each β value obtained by developing the characteristics of FIG. According to FIG. 29, the characteristic of the recording power with respect to the linear velocity magnification when recording while maintaining the β value at a predetermined value is a linear function.
y = ax + b
Where y: recording power
x: linear velocity magnification
Can be approximated by However, according to FIGS. 27 and 28, in the case of the disc C, the power margin at the time of high-speed recording is narrow (the range of the β value when the C1 error and the pit jitter are low) is narrow. It is desirable to change the target value. The thick line in FIG. 29 shows an example of the characteristic of the recording power with respect to the recording linear velocity magnification when the β value is changed so as to keep the C1 error and the pit jitter small according to the recording linear velocity magnification. This property is a quadratic function
y = ax²+ Bx + c
In this example, a = −0.0148, b = 1.4322, and c = 4.5933. However, the value of c changes relatively largely according to the wavelength of the light beam. Therefore, y = ax is stored in the memory 52 as a characteristic function of the recording power with respect to the recording linear velocity magnification for the disk C.²+ Bx + c (a and b are fixed, c is undecided) is stored in advance, and test recording (OPC) is performed prior to the actual recording to set the value of c. As a method for obtaining and setting the value of c in the test recording, a method similar to that shown in FIGS.
[0040]
Next, a specific example of a method of setting a recording power characteristic function with respect to a recording linear velocity magnification when an optical disk that is not stored in the memory 52 is inserted will be described.
(Method of FIG. 30)
Two linear velocity magnifications V1 and V2 lower than the linear velocity magnification variable range (Vi to Ve) used during actual recording (for example, when Vi = 10 ×, Ve = 16 ×, V1 = 4 ×, V2 = OPC is performed at 8 × speed, etc., and appropriate recording powers (recording powers for obtaining the set target β value) P1 and P2 at these linear velocity magnifications V1 and V2 are obtained, and these P1 and P2 are solved. The function y = ax + b is obtained and set. Alternatively, OPC is performed at three or more linear velocity magnifications lower than the variable range (Vi to Ve) of the linear velocity magnification used during actual recording, and the entire characteristic function y = ax + b is obtained by the least squares method. It is also possible to connect and set one or more appropriate recording power values with a straight line or a curve to obtain and set a characteristic function by linear approximation or curve approximation.
[0041]
(Method of FIG. 31)
One linear velocity magnification V1 lower than the linear velocity magnification variable range (Vi to Ve) used during actual recording and one linear velocity magnification V2 within the range (for example, Vi = 10 ×, Ve = 16 ×) In this case, OPC is performed at V1 = 8 × speed, V2 = 12 × speed, etc.), and appropriate recording powers (recording powers for obtaining the set target β value) P1 and P2 at these linear velocity magnifications V1 and V2 are obtained. A characteristic function y = ax + b that solves these P1 and P2 is obtained and set. Alternatively, OPC is performed with two or more linear velocity magnifications lower than the variable range (Vi to Ve) of the linear velocity magnification used in actual recording and one linear velocity magnification within the range, and the characteristic function is calculated by the least square method. y = ax + b may be obtained as a whole, or the characteristic function may be obtained by connecting the three or more recording power values with a straight line or a curve to obtain a characteristic function by linear approximation or curve approximation.
In the first embodiment, the β value is used as a parameter relating to the reproduction signal quality. However, only the CI error or the pit jitter or other parameters relating to the reproduction signal quality may be used.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of an optical disc recording apparatus according to the present invention.
FIG. 2 is an explanatory diagram of a method of performing CD-R recording by CAV on the inner circumference side and CLV on the outer circumference side.
FIG. 3 is a sectional view in the radial direction showing a region division of a CD-R disc.
FIG. 4 is a characteristic diagram showing an example of an appropriate range of a correction amount k with respect to a recording speed magnification of a CD-R disc.
5 is a diagram showing a characteristic example of a correction amount k by the strategy circuit 48 of FIG. 1 when an optical disc having the characteristics of FIG. 4 is used.
FIG. 6 is a diagram illustrating an example of a change characteristic of a linear velocity magnification and a correction amount k with respect to a position in a disk radial direction when recording is performed by switching between CAV recording and CLV recording using the characteristic of the correction amount k in FIG. It is.
7 shows another example of a change characteristic of the linear velocity magnification and the correction amount k with respect to the position in the disk radial direction when recording is performed by switching between CAV recording and CLV recording using the characteristic of the correction amount k in FIG. FIG.
8 shows still another example of the change characteristics of the linear velocity magnification and the correction amount k with respect to the position in the disk radial direction when recording is performed by switching between CAV recording and CLV recording using the characteristic of the correction amount k in FIG. FIG.
FIG. 9 is a diagram showing an example of a change characteristic of a recording linear velocity magnification and a recording power of a light beam with respect to a radial position of an optical disc.
FIG. 10 is a diagram showing the characteristics of the β value of the reproduced RF signal with respect to the recording power when recording is performed by using the disk A and changing the recording power at various linear velocity magnifications.
11 is a diagram illustrating characteristics of a C1 error with respect to a β value when the reproduction RF signal by the recording in FIG. 10 is subjected to the EFM demodulation.
12 is a diagram showing the characteristics of pit jitter with respect to the β value of the RF signal reproduced by the recording of FIG.
13 is a characteristic diagram of recording power with respect to a recording linear velocity magnification for each β value, obtained by developing the characteristic of FIG. 10;
FIG. 14 is a diagram showing the characteristics of the β value of the reproduced RF signal with respect to the recording power when recording is performed on the disk A by changing the recording power at various linear velocity magnifications using drives having different light beam wavelengths. It is.
15 is a characteristic diagram of a recording power with respect to a recording linear velocity magnification for each β value, obtained by developing the characteristic of FIG. 14;
FIG. 16 is a diagram showing an example of a technique for obtaining the value of b of the recording power characteristic y = ax + b by test recording on the disc A.
FIG. 17 is a diagram showing another example of a method for obtaining the value of b of the recording power characteristic y = ax + b in the test recording for the disk A.
FIG. 18 is a diagram showing still another example of a method of obtaining the value b of the recording power characteristic y = ax + b in test recording on the disk A.
FIG. 19 is a diagram illustrating the characteristics of the β value of the reproduced RF signal with respect to the recording power when recording is performed by using the disk B and changing the recording power at various linear velocity magnifications.
20 is a diagram illustrating characteristics of a C1 error with respect to a β value when the reproduction RF signal by the recording in FIG. 19 is EFM demodulated.
21 is a diagram showing characteristics of pit jitter with respect to a β value of a reproduced RF signal by the recording of FIG. 19;
FIG. 22 is a characteristic diagram of recording power with respect to a recording linear velocity magnification for each β value, obtained by developing the characteristic of FIG. 19;
FIG. 23 shows recording power characteristic y = ax in test recording for disk B.²FIG. 9 is a diagram illustrating an example of a technique for obtaining values of b and c of + bx + c.
FIG. 24 shows a recording power characteristic y = ax in test recording with respect to a disc B;²It is a figure which shows the other example of the technique of calculating | requiring the value of b and c of + bx + c.
FIG. 25 shows recording power characteristic y = ax in test recording for disk B.²FIG. 14 is a diagram showing still another example of a method for calculating the values of b and c of + bx + c.
FIG. 26 is a diagram showing the characteristics of the β value of the reproduced RF signal with respect to the recording power when recording is performed by using the disk C and changing the recording power at various linear velocity magnifications.
27 is a diagram illustrating characteristics of a C1 error with respect to a β value when the reproduction RF signal by the recording in FIG. 26 is EFM-demodulated.
FIG. 28 is a diagram showing characteristics of a pit jitter with respect to a β value of an RF signal reproduced by recording in FIG. 26;
FIG. 29 is a characteristic diagram of recording power with respect to a recording linear velocity magnification for each β value, obtained by developing the characteristic of FIG. 26.
30 is a diagram illustrating an example of a setting method of a characteristic function of recording power with respect to a recording linear velocity magnification when an optical disk that is not stored in the memory 52 of FIG. 1 is inserted.
31 is a diagram illustrating another example of a method of setting a characteristic function of recording power with respect to a recording linear velocity magnification when an optical disk that is not stored in the memory 52 of FIG. 1 is inserted.
[Explanation of symbols]
Reference Signs List 10 CD-R disk (optical disk), 40 servo circuit (disk servo), 28 optical pickup, 28 ATIP detection circuit (time information reading unit), 44 optical power control circuit (optical power control unit), 48 ... Strategy circuit (strategy section), 52... Memory (storage section), 50... System control circuit (system control section), 34 .beta. Value detection circuit (signal quality detection section).

Claims (18)

A method of variably recording a linear velocity magnification according to a radial position of an optical disc,
Prior to recording on an optical disk, test recording is performed at a plurality of linear velocity magnifications lower than the variable range of the linear velocity magnification used in actual recording, and an appropriate recording power at each linear velocity magnification is obtained. Based on the appropriate recording power obtained for the magnification, set the characteristics of the appropriate recording power for the linear velocity magnification,
An optical disc recording method for obtaining an appropriate recording power value based on the characteristics according to the linear velocity magnification at each radial position during actual recording, and controlling the light beam to the obtained recording power value. A method of variably recording a linear velocity magnification according to a radial position of an optical disc,
Prior to recording on the optical disk, test recording is performed at one linear velocity magnification within a variable range used for actual recording and at one or more linear velocity magnifications lower than the variable range, and appropriate recording at each linear velocity magnification is performed. Determine the recording power, set the characteristic of the appropriate recording power for the linear velocity magnification based on the appropriate recording power determined for these multiple linear velocity magnifications,
An optical disc recording method for obtaining an appropriate recording power value based on the characteristics according to the linear velocity magnification at each radial position during actual recording, and controlling the light beam to the obtained recording power value. 3. The optical disc recording method according to claim 1, wherein the characteristic is constituted by one linear function or one quadratic function or more. A method of variably recording a linear velocity magnification according to a radial position of an optical disc,
The recording power y of the light beam is set to a function y = ax + b according to the linear velocity magnification x.
Variable control according to
The value of a of the function is a fixed value according to the disc type,
Prior to recording on the optical disc, test recording is performed at an appropriate linear velocity magnification, an appropriate recording power at the linear velocity magnification is obtained, and the recording power is a solution of the function at the linear velocity magnification. Find the value,
At the time of actual recording, an appropriate recording power value is obtained based on the function in which the values of a and b are set according to the linear velocity magnification at each radial position, and the obtained recording power is applied to the light beam. An optical disc recording method that controls the value. A method of variably recording a linear velocity magnification according to a radial position of an optical disc,
The recording power y of the light beam is set to a function y = ax + b according to the linear velocity magnification x.
Variable control according to
The value of a of the function is a fixed value according to the disc type,
Prior to recording on the optical disc, test recording is performed at appropriate two linear velocity magnifications, an appropriate recording power at the two linear velocity magnifications is determined, and the two recordings are determined with respect to the solution of the function at the two linear velocity magnifications. Finding the value of b that minimizes the sum of squares of power error,
At the time of actual recording, an appropriate recording power value is obtained based on the function in which the values of a and b are set according to the linear velocity magnification at each radial position, and the obtained recording power is applied to the light beam. An optical disc recording method that controls the value. A method of variably recording a linear velocity magnification according to a radial position of an optical disc,
The function y = ax ² + bx + c is obtained by changing the recording power y of the light beam according to the linear velocity magnification x.
Variable control according to
The values of a and b of the function are fixed values according to the disc type,
Prior to recording on the optical disk, test recording is performed at an appropriate linear velocity magnification, an appropriate recording power at the linear velocity magnification is determined, and the recording power is a solution of the function at the linear velocity magnification. Find the value,
At the time of actual recording, the appropriate recording power value was obtained based on the function in which the values of a, b, and c were set according to the linear velocity magnification at each radial position, and the light beam was obtained. An optical disk recording method for controlling a recording power value. A method of variably recording a linear velocity magnification according to a radial position of an optical disc,
The function y = ax ² + bx + c is obtained by changing the recording power y of the light beam according to the linear velocity magnification x.
Variable control according to
The values of a and b of the function are fixed values according to the disc type,
Prior to recording on the optical disc, test recording is performed at appropriate two linear velocity magnifications, an appropriate recording power at the two linear velocity magnifications is determined, and the two recordings are determined with respect to the solution of the function at the two linear velocity magnifications. Finding the value of c that minimizes the sum of squares of the power error,
At the time of actual recording, the appropriate recording power value was obtained based on the function in which the values of a, b, and c were set according to the linear velocity magnification at each radial position, and the light beam was obtained. An optical disk recording method for controlling a recording power value. 8. The optical disk recording method according to claim 1, wherein the linear velocity magnification variable control recording according to the radial position of the optical disk is performed by controlling the rotation speed of the optical disk to be constant. The linear velocity at each time point is calculated based on the rotational speed of the constant rotational speed control and time information read from the wobble of the optical disc, and after the linear velocity reaches a predetermined value, recording is performed by controlling the linear velocity to be constant on the outer peripheral side. The optical disc recording method according to claim 8, wherein An optical disk recording apparatus that variably records a linear velocity magnification according to a radial position of an optical disk,
A disk servo that rotationally drives the optical disk;
An optical pickup that performs recording and reproduction by irradiating the optical disc with a light beam;
An optical power control unit that controls the power of a light beam emitted from the optical pickup;
A signal quality detection unit that calculates a predetermined parameter value related to the quality of the reproduced signal based on the reproduced signal detected by the optical pickup;
System control unit,
Prior to the actual recording of the optical disc, the system control unit performs test recording in a predetermined test area at a plurality of linear velocity magnifications lower than a variable range of the linear velocity magnification used in the actual recording. Based on the reproduction signal of the test recording, a recording power value at which a predetermined parameter relating to the reproduction signal quality becomes an appropriate value is obtained, and an appropriate recording power for the linear velocity magnification is obtained based on the appropriate recording power obtained for the plurality of linear velocity magnifications. The characteristic is set, and at the time of actual recording, an appropriate recording power value is obtained based on the characteristic according to the linear velocity magnification at each radial position, and the obtained recording power value is transmitted to the optical power control unit. Optical disk recording device that performs control for instructing a command. An optical disk recording apparatus that variably records a linear velocity magnification according to a radial position of an optical disk,
A disk servo that rotationally drives the optical disk;
An optical pickup that performs recording and reproduction by irradiating the optical disc with a light beam;
An optical power control unit that controls the power of a light beam emitted from the optical pickup;
A signal quality detection unit that calculates a predetermined parameter value related to the quality of the reproduced signal based on the reproduced signal detected by the optical pickup;
System control unit,
Prior to the actual recording of the optical disk, the system control unit is configured to perform, in a predetermined test area, one linear velocity magnification within a variable range used for actual recording and one or more linear velocities lower than the variable range. Test recording is performed at each magnification, and based on the reproduction signal of each test recording, a recording power value at which a predetermined parameter relating to reproduction signal quality becomes an appropriate value is obtained, and an appropriate recording power obtained at these linear velocity magnifications is obtained. Based on the linear velocity magnification, a characteristic of an appropriate recording power is set, and during actual recording, an appropriate recording power value is obtained based on the characteristic according to the linear velocity magnification at each radial position, and the optical power control unit is used. An optical disc recording apparatus that performs control for instructing the obtained recording power value to the recording medium. An optical disk recording apparatus that variably records a linear velocity magnification according to a radial position of an optical disk,
A disk servo that rotationally drives the optical disk;
An optical pickup that performs recording and reproduction by irradiating the optical disc with a light beam;
An optical power control unit that controls the power of a light beam emitted from the optical pickup;
A signal quality detection unit that calculates a predetermined parameter value related to the quality of the reproduced signal based on the reproduced signal detected by the optical pickup;
As a characteristic of the recording power y of the light beam with respect to the recording linear velocity magnification x, a function y = ax + b
Here, a: a storage unit for storing a fixed value corresponding to the disc type;
System control unit,
Prior to the actual recording of the optical disc, the system control unit performs test recording at a predetermined linear velocity magnification in a predetermined test area, and based on a reproduction signal of the test recording, a predetermined parameter relating to reproduction signal quality. Is determined as a recording power value at which the recording power is a proper value, and the value of b is determined so that the recording power is a solution of the function at the linear velocity magnification. At the time of actual recording, according to the linear velocity magnification at each radial position. An optical disc recording apparatus that obtains an appropriate recording power value based on the function and controls the optical power control unit to instruct the obtained recording power value. An optical disk recording apparatus that variably records a linear velocity magnification according to a radial position of an optical disk,
A disk servo that rotationally drives the optical disk;
An optical pickup that performs recording and reproduction by irradiating the optical disc with a light beam;
An optical power control unit that controls the power of a light beam emitted from the optical pickup;
A signal quality detection unit that calculates a predetermined parameter value related to the quality of the reproduced signal based on the reproduced signal detected by the optical pickup;
As a characteristic of the recording power y of the light beam with respect to the recording linear velocity magnification x, a function y = ax + b
Here, a: a storage unit for storing a fixed value corresponding to the disc type;
System control unit,
Prior to the actual recording of the optical disk, the system control unit performs test recording in a predetermined test area at an appropriate two linear velocity magnifications, and based on reproduction signals of the test recording, a predetermined parameter relating to reproduction signal quality. Is determined as the appropriate value, and the value of b is determined so that the sum of the squares of the error between the determined recording power and the solution of the function at the linear velocity magnification is minimized. Occasionally, according to the linear velocity magnification at each radial position, an appropriate recording power value is obtained based on the function, and the optical power recording unit performs control to instruct the optical power control unit to the obtained recording power value. apparatus. An optical disk recording apparatus that variably records a linear velocity magnification according to a radial position of an optical disk,
A disk servo that rotationally drives the optical disk;
An optical pickup that performs recording and reproduction by irradiating the optical disc with a light beam;
An optical power control unit that controls the power of a light beam emitted from the optical pickup;
A signal quality detection unit that calculates a predetermined parameter value related to the quality of the reproduced signal based on the reproduced signal detected by the optical pickup;
As a characteristic of the recording power y of the light beam with respect to the recording linear velocity magnification x, a function y = ax ² + bx + c
However, a, b: a storage unit for storing a fixed value according to the disk type;
System control unit,
Prior to the actual recording of the optical disc, the system control unit performs test recording at a predetermined linear velocity magnification in a predetermined test area, and based on a reproduction signal of the test recording, a predetermined parameter relating to reproduction signal quality. Is determined as a proper value, the recording power is determined as the value of c, which is a solution of the function at the linear velocity magnification, and during the actual recording, according to the linear velocity magnification at each radial position. An optical disc recording apparatus that obtains an appropriate recording power value based on the function and controls the optical power control unit to instruct the obtained recording power value. An optical disk recording apparatus that variably records a linear velocity magnification according to a radial position of an optical disk,
A disk servo that rotationally drives the optical disk;
An optical pickup that performs recording and reproduction by irradiating the optical disc with a light beam;
An optical power control unit that controls the power of a light beam emitted from the optical pickup;
A signal quality detection unit that calculates a predetermined parameter value related to the quality of the reproduced signal based on the reproduced signal detected by the optical pickup;
As a characteristic of the recording power y of the light beam with respect to the recording linear velocity magnification x, a function y = ax ² + bx + c
However, a, b: a storage unit for storing a fixed value according to the disk type;
System control unit,
Prior to the actual recording of the optical disk, the system control unit performs test recording in a predetermined test area at an appropriate two linear velocity magnifications, and based on reproduction signals of the test recording, a predetermined parameter relating to reproduction signal quality. Is determined, and the value of c at which the sum of squares of the error of the determined recording power with respect to the solution of the function at the linear velocity magnification is minimized is determined. Occasionally, according to the linear velocity magnification at each radial position, an appropriate recording power value is obtained based on the function, and the optical power recording unit performs control to instruct the optical power control unit to the obtained recording power value. apparatus. The storage unit stores a characteristic of a recording power y of the light beam with respect to the recording linear velocity magnification x for each disc type,
The system control unit discriminates a disc type and performs control for instructing a recording power y of the light beam based on a corresponding characteristic among recording power y characteristics of the light beam stored in the storage unit. 16. The optical disc recording device according to any one of 12 to 15. The system control unit drives the disk servo at a constant rotational speed on the inner peripheral side with an appropriate radial position of the optical disk as a boundary, and on the outer peripheral side, the linear velocity magnification final value in the rotational speed constant control. 17. The optical disk recording apparatus according to claim 10, wherein a command is issued to drive the linear velocity constant. A time information reading unit for reading time information from the wobble of the optical disc;
The system control unit calculates the linear velocity at each point in time based on the rotational speed of the constant rotational speed control and time information read from the wobble of the optical disc, and after the linear velocity reaches a predetermined value, the linear velocity on the outer peripheral side. 18. The optical disk recording apparatus according to claim 17, wherein recording is performed with constant control.

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