JP2000030255A - Recording method of optical disk and recorder thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve grade of recording signal by decreasing jitters, etc. SOLUTION: A timing for starting the irradiation of the laser beam of a recording power for forming the following pit is corrected according to the next pit length. Namely, the longer the next pit is, the more the timing to start emitting the laser beam for the recording power is delayed. Moreover, the timing for finishing the irradiation of the laser beam of the recording power for forming the previous pit is corrected according to the next land length. Namely, the shorter the next land length becomes, the more the timing for finishing irradiation of the laser beam of the recording power is advanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mark length recording type optical disk recording method for recording information by irradiating a recording surface of an optical disk with laser light to form pits.
The recording signal quality (jitter, deviation, error rate, etc.) is improved.

[0002]

2. Description of the Related Art As one of the recording methods of a writable optical disk, there is a CD-WO (CD Write Once) standard. CD-WO standard (commonly known as Orange Book standard)
Then, the information is 3T to 11T (1T is 1/4.
3218 MHz = 231 ns, 2x speed is 1/1 of 1x speed
At 2x and 4x speeds, 1/4 at 1x speed, at 6x speed, 1/6 at 1x speed,...) Pits and lands (portions between pits) are recorded on the optical disc. . C
As shown in FIG. 2, the beam power of the recording laser beam of the D-WO disk (commonly called CD-R) is set to the recordable top power (recording power) in the section where pits are formed, and the section where lands are formed. Is set to a bottom power (reproducing power) that can be reproduced and cannot be recorded. In this case, if the pit is formed while maintaining the top power for the length of the pit, the pit is actually formed about 1T longer due to the residual heat of the laser beam. Therefore, the so-called (nK) T
+ Α (nT) called strategy
The pits are formed by shortening the duration of the top power by about KT from the pit length nT to be formed. Note that α (nT) is the correction amount for each pit length (the amount added to the end timing of top power (the amount to delay the end of top power)), and α (3T) ≧ α (4T) ≧ α (5T) ≧. ... ≧ α (11T) (α (3T)> α (11T)).

As another recording strategy, the duration of the top power is determined by the following equation: (n−K) T + α (nT) −β (mT) where K is the length of the pit to be formed and mT is the land length immediately before the pit. : Constant α (nT): correction amount for each pit length (added to the end timing of top power (delays the end of top power)
At least α (3T) ≧ α (4T) ≧ α (5T) ≧... ≧ α (8T) (where α (3T)> α (8T)) β (mT): Land length immediately before The correction amount (the amount added to the start timing of the top power (the amount to delay the start of the top power)) is at least β (3T) ≧ β (4T) ≧ β (5T) ≧... ≧ β (8T) ( However, β (3T)> β (8T)) has also been proposed.

[0004]

The recording strategy (n−K) T + α (nT) or (n−K) T + α (nT) −β (mT)
The correction amounts α (nT) and β (mT) are the pit front end position (= land end position) and pit end position (= land front end position) depending on the magnitude of heat inflow from the front (the part where recording was performed earlier). )
This cancels out the error of (1) and improves the quality of the recording signal (jitter and the like). However, these correction amounts α (nT), β (m
There is a limit to the improvement of the recording signal quality (jitter and the like) only by the adjustment of T). In particular, as pits and lands become shorter as in the case of high-density recording, the quality of a recording signal deteriorates.

An object of the present invention is to provide an optical disk recording method which solves the above-mentioned problems in the prior art and improves the quality of a recording signal.

[0006]

According to the inventors' experiments,
Not only the influence of heat from the front but also the influence of heat from the rear (the part where recording was performed later) can cause errors in the pit front end position and pit rear end position, deteriorating signal quality such as jitter. all right.

Therefore, according to the present invention, the irradiation start timing of the laser beam of the recording power for starting the pit formation or the land formation is started in accordance with the pit length or the land length to be formed later (that is, to be formed from now). The laser beam irradiation end timing of the recording power for starting is corrected.

That is, the optical disk recording method of the present invention is a method for correcting the irradiation start timing of the laser beam of the recording power for starting the formation of the pit according to the length of the pit to be formed. When the immediately preceding land length is the same, the irradiation start timing is relatively delayed when a long pit is formed as compared to when a shorter pit is formed. According to this,
When a longer pit is formed, the heat accumulation increases and the front end of the pit tends to extend forward.Therefore, the irradiation start timing for forming the front end of the pit is set to be shorter when forming a shorter pit. By relatively delaying this tendency, this tendency can be canceled and the front end position of the pit can be correctly formed at the specified position, and the jitter and deviation can be reduced and the quality of the recording signal can be improved.

Further, another optical disk recording method of the present invention is a method for correcting the irradiation end timing of a laser beam having a recording power for starting the formation of a land according to a land length to be formed. When the pit lengths immediately before the lands are the same, the irradiation end timing is relatively earlier when a shorter land is formed than when a longer land is formed. According to this, as the shorter land is formed, the heat at the time of forming the next pit is transmitted to the previous pit via the land, and the rear end of the previous pit tends to extend rearward. Irradiation end timing for forming the rear end of the previous pit,
By canceling this tendency by making it relatively faster than when a longer land is formed, the pit trailing end position can be correctly formed at a specified position, and jitter and deviation are reduced and the recording signal quality is improved. be able to.

An optical disk recorded according to the CD-WO standard or the like has 4T out of 3T-11T pits or lands.
T pits or 4T lands each have a total of about 30
% Pits or lands, each having a probability of about 36% of the total, and pits or lands longer than 4T each having a remaining probability of 4T pits or 4T lands. In the case of forming a pit, the irradiation start timing is in accordance with a reference timing which is a timing without correction, and when forming a pit or land shorter than 4T, the irradiation start or end timing is earlier than the reference timing and longer than 4T. When pits or lands are formed, by delaying the irradiation start timing from the reference timing, the correction amount can be made close to 0 as a whole, and an increase in the DC component in the reproduced signal due to the correction can be prevented. Specifically, for example, the amount advanced from the reference timing when forming 3T pits or 3T lands is set to a time corresponding to 0 to 12% of 1T, and the reference when forming 5T to 11T pits or 5T to 11T lands. 1T delay from timing
0 to 6% of the time.

According to still another optical disc recording method of the present invention, according to a combination of a pit length to be formed and a land length immediately before the pit length, a laser beam irradiation start timing of a recording power for starting the formation of the pit is determined. It corrects the irradiation end timing of the recording power laser beam for starting the formation of the land in accordance with the combination of the land length to be formed and the pit length immediately before the land. When the irradiation start timing is corrected, the irradiation start timing is relatively delayed as compared to the case where a longer pit is formed and the shorter pit is formed when the land length immediately before the pit is the same. When the land is formed, the irradiation start timing is relatively delayed as compared with the case where the longer immediately preceding land is formed. When the pit length immediately before the land is the same, the correction of the irradiation end timing of the laser beam of the recording power is shorter when the shorter land is formed than when the longer land is formed. Is relatively advanced, and the irradiation end timing is relatively advanced when a long pit is formed as compared with a case where a shorter pit is formed.

According to this, the correction is performed in accordance with the combination of the pit length to be formed and the land length immediately before the pit, and the combination of the land length to be formed and the pit length immediately before the pit length. The position can be formed at a more correct position, jitter and deviation can be reduced, and the quality of a recording signal can be further improved.

Further, the optical disk recording apparatus of the present invention comprises:
The correction amount of the laser beam irradiation start timing of the recording power for starting the formation of the pit according to the combination of the pit length to be formed and the land length immediately before the pit, and the land length to be formed and the immediately preceding pit Storage means for storing the correction amount of the laser beam irradiation end timing of the recording power for starting the formation of the land in accordance with the combination of the lengths; the pit length of the input recording signal and the land length immediately before it; And the combination of the land length and the immediately preceding pit length are respectively detected, and the correction amount of the irradiation start timing or the irradiation end timing according to the combination is read out from the storage unit, and the irradiation start timing of the recording power laser beam or The irradiation end timing is read with respect to the reference timing which is the timing without correction. Those formed by and a correction amount correction control means that.

According to this, the irradiation start timing or the irradiation of the laser beam of the recording power is determined according to the combination of the pit length of the input recording signal and the land length immediately before or the combination of the land length and the immediately preceding pit length. Since the correction amount of the end timing is read out from the storage means and both timings are corrected, the correction can be performed without requiring a complicated calculation for obtaining the correction amount at the time of recording, and high-speed recording can be performed. it can.

[0015]

Embodiments of the present invention will be described below. FIG. 3 shows a system configuration of an optical disc recording / reproducing apparatus 1 to which the present invention is applied. Input device 28
In, the recording speed magnification is set by an operator's operation or the like. In response to a command from the system controller 19, the disk servo circuit 16 controls the spindle motor 12 to maintain a constant linear velocity at the set recording speed magnification (1.2 m / x at 1 × speed).
s to 1.4 m / s, the rotation speed is controlled at twice the speed at the time of double speed at the time of double speed, and at four times the speed at the time of normal speed at the time of double speed,... In the linear velocity constant control, in the case of the CD-WO standard, the wobble (Wobble) of the pre-group is specified to be 22.05 kHz. It can be detected from the remaining signal.) This is a predetermined frequency (2 times at 1 × speed).
2.05kHz, 44.1kHz at 2x speed, 8 at 4x speed
This is realized by performing PLL control on the spindle motor 12 so as to be detected at 8.2 kHz (...).

The focus servo and tracking servo circuit 18 controls the focus and tracking of the laser beam 11 emitted from the semiconductor laser in the optical head 13 according to a command from the system controller 19. The tracking control is performed by detecting a pre-groove formed on the disk 10. The feed servo circuit 17 drives the feed motor 20 in accordance with a command from the system controller 19 to move the optical head 13 in the radial direction of the optical disk 10.

An input signal to be recorded on the optical disk 10 (CD-WO disk) is input directly to the recording signal forming circuit 22 in the case of a digital signal at a speed corresponding to the recording speed magnification, and an A / D signal in the case of an analog signal. The signal is input to the recording signal forming circuit 22 via the converter 24. Recording signal forming circuit 2
2 interleaves the input data to add an error check code, and also adds TOC information and subcode information generated by the TOC and subcode generation circuit 23, and performs EFM modulation to format and record a CD standard. A series of serial data is formed at a transfer rate corresponding to the speed magnification and output as a recording signal.

This recording signal is supplied to the recording signal correction circuit 26 (irradiation control means) via the drive interface 15.
Then, the data is modulated by a recording strategy selected in accordance with the type of disk (type of dye material), linear velocity, recording speed magnification, and the like, and is input to the laser generation circuit 25. The laser generation circuit 25 drives the semiconductor laser in the optical head 13 according to the recording signal to irradiate the laser light 11 to the recording surface of the optical disk 10 to form pits and perform recording. At this time, the laser power is commanded to a value corresponding to the recording speed magnification and, if necessary, the linear velocity, and the ALPC (Automatic Laser Po
wer Control) The power is controlled with high precision by this circuit. As a result, the optical disc 10 has a CD-W
Format, transfer speed and linear speed of O standard (1.2
〜1.4 m / s).

The optical disk 10 recorded as described above
When reproduction is performed by irradiating a laser beam for reproduction (lower power than the laser beam of the recording power) to the reproduction, the read data is demodulated by the signal reproduction processing circuit 30 and directly converted into a digital signal.
The signal is converted into an analog signal by the D / A converter 31 and output.

FIG. 1 shows a control block of recording control by the system controller 19 shown in FIG. The recording speed magnification setting means 28 corresponds to the input device 28 in FIG. 3, and sets the recording speed magnification (× 1, × 2, × 4,...) By the operation of the operator. The disc type and linear velocity discriminating means 32 discriminates the disc type and linear velocity of the optical disc 10 set in the apparatus. The disc type can be determined using, for example, information indicating the disc type among the disc IDs recorded in advance on the optical disc 10. For the linear velocity, for example, the recording time (63-minute type, 74-minute type, and other intermediate types) recorded in the ATIP signal at the lead-in portion of the disk is read, and the corresponding linear velocity is determined (63 minutes). It can be calculated from the encoder output of the spindle motor or 1.4 m / s for the type and 1.2 m / s for the 74 minute type.

The recording strategy storage means 34 stores an optimal recording strategy (time modulation amount, recording power, etc.) according to the combination of the disc type, linear velocity, and recording speed magnification. The recording strategy selection means 36 reads out a corresponding recording strategy from the recording strategy storage means 34 according to the information of the inputted disc type, linear velocity, and recording speed magnification. The control means 38 controls the recording signal correction circuit 26 according to the read recording strategy to modulate the length of the pit forming portion and the land forming portion of the recording signal. Also, by controlling the laser generation circuit 25,
Control the laser power. Also, disk servo circuit 1
6 to control the rotation of the spindle motor 12 to a speed corresponding to the commanded recording speed magnification.

The specific contents of the control of the irradiation time of the recording laser beam by the control means 38 in FIG. 1 will be described. [1] Correction of laser beam irradiation start timing of recording power based on the next pit length When a longer pit is formed, heat accumulation increases and the pit front end tends to extend forward, so that a shorter pit is formed. The irradiation start timing of the laser beam of the recording power for forming the front end of the pit is relatively delayed. FIG. 4 shows the reference timing (without correction) of the irradiation start timing based on the length nT of the next pit (the pit to be formed next) when the length mT of this land (currently formed land) is constant. 3 shows the change of the correction amount γ (m, n) from the timing in the case of FIG. The amplitude of each waveform indicates a laser power, Pt indicates a recordable top power (recording power), and Pb indicates a reproducible and non-recordable bottom power (reproducing power). The correction amount γ (m, n) is set so as to satisfy the conditions of Expressions (1) to (4). The numerical value (%) of the correction amount is 1
It is a ratio to the length of T.

When the next pit length is 3T: −12% ≦ γ (3,3) ≦ γ (4,3) ≦... ≦ γ (11,3) ≦ 0% (However, γ (3,3) <Γ (11,3)) (1) When the next pit length is 4T: γ (3,4) = γ (4,4) =... = Γ (11,4) = 0% (2) Next pit When the length is 5-11T: 6% ≧ γ (3, n) ≧ γ (4, n) ≧ ... ≧ γ (11, n) ≧ 0% (However, γ (3, n)> γ (11 , N)) (3) When the land lengths mT are the same: -12% ≦ γ (m, 3) ≦ γ (m, 4) = 0% ≦ γ (m, 5) ≦ γ (m, 6) ≦ ... ≦ γ (m, 11) ≦ 6% (However, γ (m, 3) <γ (m, 11)) (4)

[2] Correction of laser beam irradiation end timing of recording power by next land length The shorter a land is formed, the more the heat at the time of forming the next pit is transmitted to the previous pit via the land, and Since the trailing edge of the preceding pit tends to extend backward, the irradiation end timing of the laser beam of the recording power for forming the trailing edge of the preceding pit is relatively shorter than when a longer land is formed. Quickly. FIG. 5 shows the correction amount from the reference timing of the irradiation end timing based on the length mT of the next land (land to be formed next) when the length nT of this pit (the pit currently formed) is fixed. λ
9 shows a change in (n, m). The correction amount λ (n,
m) is set so as to satisfy the conditions of Expressions (5) to (8). The numerical value (%) of the correction amount is a ratio to the length of 1T.

When the next land length is 3T: −12% ≦ λ (3,3) ≦ λ (4,3) ≦... ≦ λ (11,3) ≦ 0% (where λ (3,3) <Λ (11,3)) (5) When the next land length is 4T: λ (3,4) = λ (4,4) =... = Λ (11,4) = 0% (6) Next land When the length is 5 to 11T: 6% ≧ λ (3, m) ≧ λ (4, m) ≧ ... ≧ λ (11, m) ≧ 0% (where λ (3, m)> λ (11 , M)) (7) When the pit length nT is the same: -12% ≦ λ (n, 3) ≦ λ (n, 4) = 0% ≦ λ (n, 5) ≦ λ (n, 6) ≦ ... ≦ λ (n, 11) ≦ 6% (where λ (n, 3) <λ (n, 11)) (8)

[3] Correction of laser beam irradiation start timing of recording power based on the land length immediately before and correction of laser beam irradiation end timing of recording power based on the pit length described above (n−K) T + α (nT) − By the β (nT) strategy, the pit length n
(N−K) T + α (nT) −β (mT) where K is a constant α (nT) is a correction amount for each pit length (added to the end timing of the top power). At least α (3T) ≧ α (4T) ≧ α (5T) ≧... ≧ α (8T) (where α (3T)> α (8T) (9) β (mT): The correction amount for each land length immediately before (the amount added to the start timing of top power (the amount to delay the start of top power)), and at least β (3T) ≧ β (4T) ) ≧ β (5T) ≧ ... ≧ β (8T) (where β (3T)> β (8T)) (10)

The control means 38 shown in FIG.
Controls [2] and [3] are performed together. That is, the irradiation start timing of the laser beam of the recording power is shown in FIG.
As shown in (1), correction is performed by adding the correction amount β (mT) based on the land length and the correction amount γ (m, n) based on the next pit length. As shown in FIG. 7, the laser beam irradiation end timing of the recording power is corrected by adding the correction amount α (nT) based on the pit length and the correction amount λ (n, m) based on the next land length. Do.

Specifically, the recording strategy storage means 34 of FIG. 1 stores, in the recording strategy storage means 34, an added value β (mT) + γ (m, m) of the correction amount of the irradiation start timing according to the combination of the land length and the next pit length.
n) is stored in advance for each combination, and the added value α (nT) + λ of the correction amount corresponding to the combination of the pit length and the next land length is stored.
(N, m) is stored in advance for each combination.

Table 1 shows the correction amount β (mT) + γ (m, n) of the irradiation start timing for each combination of the land length and the next pit length.
Shown in Table 2 shows the correction amount α (nT) + λ (n, m) of the irradiation end timing for each combination of the pit length and the next land length.

[0030]

[Table 1]

[0031]

[Table 2] The control means 38 detects the combination of the land length and the next pit length of the input recording signal, reads out the corresponding correction amount β (mT) + γ (m, n) from the recording strategy storage means 34, and The irradiation start timing of the laser beam of the recording power for starting the pit formation is corrected by the correction amount. Also,
The combination of the pit length and the next land length of the recording signal is detected, the corresponding correction amount α (nT) + λ (n, m) is read from the recording strategy storage means 34, and the recording power at which the formation of the pit is completed. The laser beam irradiation end timing is corrected by the correction amount.

FIG. 8 shows an example of the correction operation by the control means 38.
Shown in (A) is a recording signal before correction, (b) is a signal obtained by correcting the KT of the recording signal, and (c) is β (mT) + γ.
This is a final laser drive signal corrected by (m, n), α (nT) + λ (n, m).

Table 3 shows setting examples (%) of the correction amount β (mT) + γ (m, n). In addition, the correction amount α (nT) + λ (n,
Table 4 shows setting examples (%) of m). The set values in Tables 3 and 4 are obtained when double-speed recording is performed on a cyanine-based high-density disc. The pit jitter characteristic when recording is performed with these settings is shown by a dotted line in FIG. 9, and the land jitter characteristic is shown by a dotted line in FIG. Under the same recording conditions, the correction amounts γ (m, n) and λ (n, m) are all 0%.
In other words, the pit jitter characteristic when the correction is made only by α (nT) and β (mT) is shown by a solid line in FIG. 9, and the land jitter characteristic is shown by a solid line in FIG. Note that β (%) on the horizontal axis in FIGS. 9 and 10 is a parameter related to the recording power determined by the CD-WO standard, and the correction amount β (mT)
Is another parameter.

[0034]

[Table 3]

[0035]

[Table 4] According to FIGS. 9 and 10, when the correction by γ (m, n) and λ (n, m) is performed (dotted line), the jitter is reduced and the recording signal is reduced as compared with the case without correction (solid line). It can be seen that the quality has been improved.

In the above embodiment, the present invention is applied to a CD.
Although the case where the present invention is applied to optical disc recording of the WO standard has been described, the present invention can also be applied to optical disc recording of another standard of the mark length recording method.

[Brief description of the drawings]

FIG. 1 is a control block diagram of recording control by a system controller of FIG. 3;

FIG. 2 is a waveform diagram of a recording laser beam.

FIG. 3 is a block diagram showing an embodiment of the optical disc recording apparatus of the present invention.

FIG. 4 is a waveform diagram illustrating correction of laser beam irradiation start timing correction of recording power based on the next pit length.

FIG. 5 is a waveform diagram illustrating correction of laser irradiation end timing correction of recording power based on the next land length.

FIG. 6 is a waveform diagram illustrating correction of laser beam irradiation start timing of recording power by a combination of the land length and the next pit length.

FIG. 7 is a waveform diagram illustrating correction of laser beam irradiation end timing correction of recording power based on a combination of the pit length and the next land length.

FIG. 8 is a waveform chart showing an example of a correction operation by the control means 38 of FIG.

FIG. 9 is a diagram showing pit jitter characteristics when the irradiation start timing is corrected based on the next pit length and the next land length and when it is not corrected.

FIG. 10 is a diagram showing land jitter characteristics when the irradiation start timing is corrected based on the next pit length and the next land length, and when the correction is not performed.

[Explanation of symbols]

 Reference Signs List 10 optical disk 11 laser beam 34 recording strategy storage means (storage means) 38 control means Pt top power (recording power)

Claims (9)

[Claims] An optical disk recording system for irradiating a recording laser beam modulated by a recording signal onto a recording surface of a recordable optical disk to form pits and lands alternately by a mark length recording method and record the information. A method for correcting the irradiation start timing of a laser beam having a recording power for starting the formation of a pit according to the length of the pit to be formed, wherein when a land length immediately before the pit is the same, a long pit is formed. The method of recording an optical disc, wherein the irradiation start timing is relatively delayed as the pits are formed, as compared with the case of forming shorter pits. 2. The irradiation start timing for forming a 4T pit is the same as the reference timing which is a timing without correction, and when forming a pit shorter than 4T, the irradiation start timing is set earlier than the reference timing.
2. The optical disk recording method according to claim 1, wherein when forming a pit longer than T, the irradiation start timing is delayed from the reference timing. 3. An amount advanced from a reference timing for forming a 3T pit is set to a time corresponding to 0 to 12% of 1T, and
3. The optical disc recording method according to claim 2, wherein the amount of delay from the reference timing for forming a pit of .about.11T is a time corresponding to 0-6% of 1T. 4. A recording surface of a recordable optical disk is irradiated with a recording laser beam modulated by a recording signal, and pits and lands are alternately formed by a mark length recording system to record the information. A method for correcting the irradiation end timing of a laser beam of a recording power for starting the formation of a land according to a land length to be formed, wherein a short land is used when a pit length immediately before the land is the same. The recording method of an optical disk, in which the irradiation end timing is relatively earlier when forming the laser beam than when forming a longer land. 5. The irradiation end timing when forming a 4T land is the same as the reference timing which is a timing without correction, and when forming a land shorter than 4T, the irradiation end timing is set earlier than the reference timing. 5. The optical disk recording method according to claim 4, wherein when forming a long land, the irradiation end timing is delayed from the reference timing. 6. An amount advanced from a reference timing when forming a 3T land is set to a time corresponding to 0 to 12% of 1T, and
6. The optical disk recording method according to claim 5, wherein the amount of delay from the reference timing for forming a land of up to 11T is a time corresponding to 0 to 6% of 1T. 7. A recording surface of a recordable optical disk, which is irradiated with a recording laser beam modulated by a recording signal, and pits and lands are alternately formed by a mark length recording system to record the information. In the method, according to a combination of a pit length to be formed and a land length immediately before the pit, irradiation start timing of a laser beam of a recording power for starting formation of the pit is corrected, and the land length to be formed and the immediately preceding land length are corrected. According to the combination of the pit lengths, the irradiation end timing of the laser beam of the recording power for starting the formation of the land is corrected, and the correction of the irradiation start timing of the laser beam is performed by correcting the land length immediately before the pit. When the irradiation start timing is relatively delayed, the longer the pit is formed, the shorter the pit is formed. In addition, the irradiation start timing is relatively delayed when the shortest land is formed as compared with the case where the longer land is formed, and the irradiation end timing of the laser beam of the recording power is corrected. However, when the pit length immediately before the land is the same, the shorter the land is formed, the earlier the irradiation end timing is, as compared to the case of forming a longer land, and
An optical disk recording method in which the longer the pits are formed, the earlier the irradiation end timing is made, compared to the case of forming shorter pits. 8. A recording surface of a recordable optical disk, which is irradiated with a recording laser beam modulated by a recording signal, and pits and lands are alternately formed by a mark length recording system to record the information. In the apparatus, according to a combination of a pit length to be formed and a land length immediately before the pit, a correction amount of a laser beam irradiation start timing of recording power for starting formation of the pit, and a land length to be formed and its Storage means for storing the correction amount of the laser beam irradiation end timing of the recording power for starting the formation of the land in accordance with the combination of the immediately preceding pit length; The combination of the land length and the combination of the land length and the pit length immediately before the land length are detected, and the combination is stored in the storage means. The correction amount of the irradiation start timing or the irradiation end timing is read, and the irradiation start timing or the irradiation end timing of the laser beam of the recording power is corrected by the read correction amount with respect to the reference timing that is the timing without correction. An optical disk recording device comprising a control unit. 9. The correction amount of the irradiation start timing of the laser beam of the recording power is such that when the land length immediately before the pit is the same, a longer pit is formed as compared with a case where a shorter pit is formed. The start timing is relatively delayed, and the irradiation start timing is set to a value that delays the irradiation start timing relatively more in the case of forming the land immediately before it is shorter than in the case of forming the land immediately before it is longer. When the correction amount of the laser beam irradiation end timing of the power is the same as the pit length immediately before the land, the shorter the land is formed, the shorter the irradiation end timing is made compared to the case of forming a longer land. In addition, a value that makes the irradiation end timing relatively earlier when a long pit is formed, compared to when a shorter pit is formed. 9. The optical disk recording apparatus according to claim 8, wherein the setting is made as: