JP2000215454A - Optical disk recorder and method for recording information on optical disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely correct write-in power of a laser regardless of a kind of an optical disk. SOLUTION: The kind of the optical disk is discriminated by the special information of the optical disk, or the kind of the optical disk is discriminated from a detection result of a reflected beam intensity level by a B value/peak value operation circuit 10, and the timing sampling and holding a B value is switched according to the kind of the optical disk by a timing control circuit 9. Thus, the B value is sampled at the timing that the variable amount of the B value for the change of the write-in power of an LD(laser diode) becomes large, and the write-in power is corrected precisely by running OPC(optimum power control) regardless of the kind of the optical disk.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a write-once optical disc (Compact Disk-Recordable:
The present invention relates to an optical disk recording device for writing data by irradiating a light beam from a light source such as a laser to R) and a method of recording information on an optical disk.

[0002]

2. Description of the Related Art Conventionally, in an optical disk recording device, C
When a data signal is recorded on an optical disk such as a DR, a CIRC (Cross Interleaved Read-So
lomonCode) and the like, a parity for error correction is added, and this is further added to EFM (Eight to Fourtee).
Recording is performed by modulating according to the (n Modulation) method. By performing the EFM modulation, nine time widths (hereinafter, referred to as 3T to 11T time widths) of 3 to 11 times the predetermined reference time width T are set as the high and low level time widths of the reference digital signal. Is given. The optical disk recording device irradiates a laser beam to the optical disk by a laser based on the reference digital signal, and forms a pit portion in the recording layer. For example, a pulsed laser beam having an intensity capable of forming a pit portion is irradiated during a high level period of the reference digital signal.

When information is recorded on a write-once optical disc, first, a write power by a laser (Write Power) is used.
Optimization is performed. This optimization is based on OPC (Optimum
Power Control), a power calibration area (hereinafter referred to as P) of the optical disc.
CA) is irradiated with a laser beam to record predetermined information, and the recorded information is reproduced to optimize the writing power of the laser. The PCA is divided into a test area and a count area, each of which is divided into 100 partitions.

[0004] OPC will be described with reference to FIG.
As shown in FIG. 5A, one partition of the test area is composed of 15 frames, and one partition is used in one trial writing.
Partitions are used. 1 in this test area
Trial writing is performed in 15 steps with laser writing power in 5 frames, and the writing power with the best recording state is selected. Then, the subsequent information recording is performed with the determined write power to form a pit portion on the optical disk. Also, as shown in FIG.
When performing 15 tests in the test area of the PCA, if the writing power of the laser is increased stepwise,
The peak value increases accordingly (see FIG. 5 (c)).
Here, the peak value is the maximum value of the intensity of the reflected light from the pit during information recording, and is the intensity of the reflected light from the tip of the pit. In addition, in the case of a cyanine-based optical disc, the B value, which is the minimum value of the reflected light intensity from the pit portion during information recording, is increased as the laser writing power increases, as shown in FIG. On the other hand, in the case of a phthalocyanine-based optical disk, the B value decreases at first according to the write power, but as shown in FIG. Conversely, it tends to increase. This B value is usually the intensity of light reflected from the rear end of the pit.

Incidentally, the optical disk recording apparatus has a B value detecting circuit for detecting a B value which is the intensity of light reflected from the rear end of the pit. When recording information, the B value detecting circuit detects the B value. Thus, the writing power of the laser is corrected as needed. In this way, when actual information is recorded, the laser writing power is corrected and controlled at any time, which is referred to as running OPC. The running OPC compares the intensity of light reflected from the pit at the time of OPC with the intensity of light reflected from the pit at the time of information recording by the B value detection circuit, and obtains the intensity at the time of OPC based on the comparison result. Information recording is performed while correcting the writing power of the laser as needed. Here, as the pit portion for obtaining the reflected light intensity, a pit portion having a reference time width of, for example, an 11T time width is used. In the running OPC, the B value which is the reflected light intensity from the rear end of the pit portion is used. used.

[0006]

FIG. 6 is a diagram showing a change in the reflected light intensity level between the cyanine optical disk and the phthalocyanine optical disk with respect to the optical output. FIG. 6 (a) shows the optical output, and FIG. 6 (b) shows the optical output. FIG. 6C shows the reflected light intensity level of the cyanine-based optical disk, and FIG. 6C shows the reflected light intensity level of the phthalocyanine-based optical disk. In the above-mentioned conventional write-once optical disc recording apparatus, the writing power of the laser is corrected based on the B value which is the intensity of the reflected light from the rear end of the pit portion having an 11T time width during information recording. As shown in FIG. 6, with respect to the reflected light intensity B value from the rear end of the pit portion having a time width of 11T, since the pit portion is formed to some extent at this rear end portion, the writing power of the laser is increased. However, the amount of change in the reflected light intensity level due to the change in the writing power of the laser is small as shown in FIGS. 6 (b) and 6 (c), and is very small especially for a phthalocyanine-based optical disk.

FIG. 7 is a schematic diagram showing a change in B value / peak value with respect to a change in laser writing power. In FIG. 7, the horizontal axis represents the write power of the laser (Write Power).
), And the vertical axis indicates the value of B value / peak value. As shown in FIGS. 5 (d) and 5 (e), when the writing power of the laser is gradually increased between the cyanine-based optical disk and the phthalocyanine-based optical disk, in the case of the cyanine-based optical disk, B increases in accordance with the increase in the writing power. On the other hand, in the case of a phthalocyanine-based optical disk, the B value initially decreases in accordance with the write power, but when the write power increases to some extent, the B value tends to saturate and conversely increase. Since there is such a tendency between the cyanine-based optical disc and the phthalocyanine-based optical disc, the change in the B value / peak value when the writing power of the laser is increased is shown by the solid line in FIG. As described above, according to the increase in the write power, the B value / peak
On the other hand, in the phthalocyanine series, the value of the B value / peak value initially decreases as the write power increases, as shown by the dotted line in FIG. 7, but when the write power is increased to some extent, the B value / peak value decreases. The peak value does not change and tends to saturate. Therefore, in the phthalocyanine-based optical disk, even if the write power changes around the optimum recording power of the laser, the change amount of the B value / peak value is small, and the detection sensitivity of the change in the write power of the laser is poor. . As described above, depending on the type of the optical disk used, the detection sensitivity of the fluctuation of the writing power of the laser may be greatly reduced, so that the fluctuation of the writing power of the laser may not be detected or may be erroneously detected. Therefore, there is a problem that it is difficult to accurately correct the writing power of the laser in the running OPC regardless of the type of the optical disc. The present invention has been made in view of the above problems, and provides an optical disc recording apparatus and a method for recording information on an optical disc that can accurately correct the writing power of a light source during information recording regardless of the type of the optical disc. .

[0008]

According to a first aspect of the present invention, there is provided an optical disk recording apparatus comprising: a light source for irradiating a laser beam onto an optical disk to form a pit portion on which information is recorded; An optical output control means for correcting the write power of the laser light based on the B value as the intensity of the reflected light from the optical disk, the intensity of the reflected light from the pit portion accompanying the change in the write power of the light source An optical disc discriminating means for discriminating the type of the optical disc from the magnitude of the level inclination; and timing control means for switching the timing for sampling and holding the B value according to the type of the optical disc discriminated by the optical disc discriminating means. It is a feature.

An optical disk recording device according to a second aspect of the present invention is the optical disk recording device according to the first aspect,
The optical disc discriminating means discriminates the type of the optical disc as a phthalocyanine optical disc if the magnitude of the reflected light intensity level is larger than a predetermined value, and if the magnitude of the reflected light intensity level is smaller than a predetermined value, the type of the optical disc. When the type of the optical disc is determined to be a cyanine-based optical disc by the optical disc discriminating means, the timing control means switches to a timing for sampling and holding the B value from the latter half of the pit portion. When the type of the optical disc is determined to be a phthalocyanine-based optical disc by the optical disc discriminating means, the timing is switched to the timing for sampling and holding the B value in the first half of the pit portion.

According to a third aspect of the present invention, there is provided a method for recording information on an optical disk, wherein, prior to actual recording of information, a trial write is performed by irradiating the optical disk with a laser beam, and the trial written information is read out. The optimum power of the laser light is determined, and based on the B value as the reflected light intensity from the rear end of the pit formed by the irradiation of the laser light when actual information is recorded using the optimum power. In the method for recording information on an optical disk, wherein information is recorded on the optical disk while correcting the optimum power of the information, the information recorded in the special information of the optical disk or the magnitude of the gradient of the reflected light intensity level accompanying a change in the writing power of the laser light. A timing for discriminating the type of the optical disc and sampling and holding the B value according to the type of the optical disc based on the discrimination result. It is characterized in that to perform the switching.

According to a fourth aspect of the present invention, there is provided a method for recording information on an optical disk according to the third aspect, wherein the pit portion has a reference time width T serving as a timing for irradiating a laser beam. Time width 1 which is 11 times of
If the type of the optical disc has 1T, and the type of the optical disc is a cyanine-based optical disc, the B value is sampled and held at the timing of the latter half of the pit portion that is 4T or later of the time width 11T, and the type of the optical disc is the phthalocyanine-based In the case of an optical disk, two or three of the time width 11T are used.
The sample and hold of the B value is performed at the timing of the first half of the pit portion serving as T.

[0012]

Embodiments of the present invention will be described below. FIG. 1 is a block diagram showing a configuration of an optical disk recording device according to an embodiment of the present invention. As shown in FIG. 1, an optical disk recording apparatus according to the present embodiment includes a laser diode (hereinafter, referred to as an LD) 1.
Irradiates the optical disk 11 with laser light from the
And writing data by forming a pit portion in the pit portion, wherein B is a reflected light intensity from a rear end portion of the pit portion.
An optical output control circuit 5 that controls the write power of the LD 1 as needed based on the value is provided. In the present embodiment, a pit having 11 times (11T time width) the reference time width T of the high level and the low level of the reference digital signal to be recorded is used. The optical disk recording apparatus according to the present embodiment includes a monitor photodiode 2, a servo / RF photodiode 3, an APC (Automatic Power Control).
l) A circuit 4 and a running OPC loop filter circuit 6 are provided. The LD 1 is a light source for irradiating the optical disc 11 with a laser beam to form a pit portion for recording information on a recording layer of the optical disc 11. The monitoring photodiode 2 receives a part of the laser beam irradiated on the optical disk 11, monitors the light output level, and converts the output level into an electric signal. The APC circuit 4 corrects the optical output of the LD 1 using the output of the monitoring photodiode 2, and thereby,
And the recording power at the time of recording and the recording power at the time of recording are kept at predetermined values. The servo / RF photodiode 3 receives the reflected light of the laser light applied to the optical disk 11 and converts the reflected light into an electric signal. Also,
The optical output control circuit 5 detects a B value from the outputs of the servo / RF photodiode 3 and controls the write power of the LD 1 based on the B value. The configuration of the light output control circuit 5 will be described later. The running OPC loop filter circuit 6, based on a command from the light output control means 5,
The control band and the gain of the running OPC are set. As described in the background art, running OPC compares the intensity of light reflected from a pit during test writing with the intensity of light reflected from a pit during information recording. That is, information recording is performed while correcting the optimum power of the LD 1 as needed. The set value of the recording power by the LD 1 of the APC circuit 4 is changed by the output of the running OPC loop filter circuit 6, whereby the recording power of the LD 1 is varied and the B value is controlled to a predetermined value.

FIG. 2 is a diagram showing a configuration of the light output control circuit 5. As shown in FIG. As shown in FIG. 2, the light output control circuit 5 includes a peak detection circuit 7, a sample and hold circuit 8 for detecting a B value, a timing control circuit 9 for setting a sample and hold timing, and a B value for obtaining a B value / peak value. / Peak value calculation circuit 10. The peak detection circuit 7 detects a peak value from the output of the servo / RF photodiode 3. Sample hold circuit 8
In the output of the servo / RF photodiode 3,
The B value is detected. The timing control circuit 9 controls the timing at which the sample and hold circuit 8 samples and holds the B value. In this timing control, the timing of sampling the B value is switched depending on whether the optical disk 11 for recording is a cyanine optical disk or a phthalocyanine optical disk. Specifically, if the type of the optical disk 11 is a cyanine-based optical disk, the optical disc 11 is performed at a later timing corresponding to a portion after 4T of a pit portion having a reference time width of 11T. The sample timing is switched so as to be performed at an earlier timing corresponding to the 3T portion. In the B value / peak value calculation circuit 10, p obtained from the peak detection circuit 7 and the sample hold circuit 8 are obtained.
The value of B value / peak value is calculated from the eak value and the B value. If the calculated value is equal to or greater than a predetermined value, the type of the optical disk 11 is recognized as a cyanine-based optical disk. Is recognized as a phthalocyanine optical disk. Then, the type of the optical disc 11 determined by the B value / peak value calculation circuit 10 is sent to the timing control circuit 9.

Next, the operation of the optical disk recording apparatus according to the present embodiment will be described. Prior to recording actual information on the optical disc 11, the optimum power of the LD 1 is determined, and the type of the optical disc 11 is determined. First, the discrimination of the type of the optical disc 11 is based on the fact that the disc information recorded on the optical disc 11 is read from the special information of the optical disc 11 at the time of data recording, and from the special information, the maker of the optical disc 11 is an existing disc maker. If specified, the disc manufacturer will clarify whether the type of the optical disc 11 is a cyanine-based optical disc or a phthalocyanine-based optical disc. However, if the disc maker is a new disc maker rather than an existing disc maker, it is impossible to determine the type of the optical disc 11, and in that case, as described below, the optimum power of the LD 1 is determined and the The type is determined.

In order to determine the optimum power of the LD 1, as described with reference to FIG.
In the PCA test area, test writing is performed with 15 levels of writing power, and the test power is reproduced. The writing power with the best recording state is selected as the optimum power, and is determined as the writing power for information recording. The light output control circuit 5 uses the reflected light of the optical disk 11 received by the servo / RF photodiode 3 to generate
The peak value is detected by the k detection circuit 7, and the B value is detected by the sample and hold circuit 8. And
In the B value / peak value calculation circuit 10, the B value / peak value
The value of the value is determined. As shown in FIG. 7, the change in the B value / peak value due to the change in the write power to the optical disk 11 gradually decreases as the write power increases in the phthalocyanine-based optical disk.
In a phthalocyanine-based optical disk, the value of the B value / peak value gradually decreases with an increase in the writing power at first, but when the writing power increases, the B value / peak value increases.
The change amount of the peak value becomes smaller, and the B value / peak value eventually converges to a certain level. Therefore, the inclination of the phthalocyanine-based optical disk near the optimum laser power is smaller than that of the cyanine-based optical disk. Therefore, the type of the optical disk is determined using such a tendency.

FIG. 3 shows a method of discriminating an optical disk. The discrimination of this optical disc is performed by the B value /
This is performed in the peak value calculation circuit 10. FIG. 3 shows a change in the B value / peak value due to a change in the write power (WritePower) obtained from 15 power tests in the test area of the PCA. At this time, the optimum recording power P is also obtained. First, when discriminating the optical disk 11, when the writing power is around the optimum recording power, the slope of the change of the B value / peak value with respect to the change of the writing power is large in the cyanine-based optical disk, whereas the B value / peak is changed in the phthalocyanine-based optical disk. The peak value almost converges to a certain value, and its slope is small. Therefore, from the difference in the value of B value / peak value, the optical disc 1
1 is determined. That is, as an example of disc discrimination, in FIG. 3, the optimum recording power P
The slope a of the B value / peak value in the range of ± 0.5 mW is obtained.

[0017]

(Equation 1)

If the absolute value of the gradient a of the B value / peak value is not less than 0.1, it is determined that the type of the optical disk 11 is a cyanine optical disk, and the absolute value of a is less than 0.1. If so, it is determined that the optical disk is a phthalocyanine-based optical disk. As described above, the type of the optical disk is determined. Therefore, even in the case of an optical disk of a new disk maker or the like and the type of the optical disk cannot be determined from the special information, the characteristic of the reflected light intensity level of the optical disk can be determined. Thus, the type of the optical disc can be determined accurately.

Next, switching of the timing for sampling and holding the B value will be described. The switching control of the sample-hold timing of the B value is performed by the timing control circuit 9 based on the calculation result of the B value / peak value calculation circuit 10 in the light output control circuit 5. FIG. 4 shows the switching of the sample hold timing. In FIG. 4, the change in the reflected light level of the cyanine-based optical disk (FIG. 4A) and the phthalocyanine-based optical disk (FIG. 4B) when the write power of the LD 1 is large and small, and the B value at that time. The difference in sample timing is shown. The sampling of the B value for correcting the write power of the LD 1 is first performed at the rear end of the pit having an 11T time width during information recording. In a cyanine-based optical disc, as shown in FIG. 4 (a), the reflected light intensity level at the rear end of the pit greatly changes due to a change in the write power, so that the write power is determined based on the B value detected at the current sample timing. Can be easily corrected. However, in a phthalocyanine-based optical disk, since the change in the reflected light intensity level at the rear end of the pit is small, the LD value is determined based on the B value detected at the current sample timing.
The correction accuracy of the writing power of No. 1 is deteriorated. for that reason,
After discriminating the type of the optical disk by the above method, FIG.
As shown in (a) and (b), when the type of the optical disc is a cyanine-based optical disc, four pits having an 11T time width are used.
The B value is sampled and held at a later timing of the latter half corresponding to T or later, while the B value is obtained at an earlier timing of the first half corresponding to 2T to 3T of a pit portion having an 11T time width in the case of a phthalocyanine optical disk. Of sample hold. Thus, the B value can be sampled from the portion where the reflected light intensity changes greatly in the pit portion regardless of the type of the optical disk.

As described above, according to the optical disk recording apparatus of the present embodiment, the B value / value depends on the type of the optical disk.
Utilizing the fact that the slope of the peak value is different, the B value / peak value calculation circuit 10 in the light output control circuit 5 calculates the B value / peak value from the reflected light of the pit portion of the optical disk 1 to determine the type of the optical disk 11. It can be easily determined. When the type of the optical disk is specified, the timing for sampling and holding the B value is switched by the timing control circuit 9 in the optical output control circuit 5 according to the type of the optical disk.
The B value can be sampled at a timing when the amount of change of the B value with respect to the change of the write power becomes large.
Regardless of the type of the optical disk, it is possible to accurately correct the writing power by the running OPC.

In the optical disk recording apparatus according to the present invention, the light output control circuit 5 can be constituted by hardware or software. Further, when the light output control circuit 5 is configured by software, a program according to the above-described method of discriminating the type of the optical disc and switching the sample / hold timing of the B value is recorded on a recording medium, and the recording medium is read by a computer. It is also possible to realize it.

[0022]

As described above, according to the optical disc recording apparatus of the first aspect of the present invention, the magnitude of the gradient of the intensity level of the reflected light from the pit caused by the change in the writing power of the light source is determined by the optical disc discriminating means. , The type of the optical disk can be easily determined even if the optical disk is from a new disk maker.
Further, since the timing for sampling and holding the B value is switched by the timing control means in accordance with the type of the optical disk determined by the optical disk determination means, regardless of the type of the optical disk, the B value which is the intensity of the reflected light from the pit portion is obtained. This makes it possible to improve the detection sensitivity, thereby making it possible to perform the running OPC more stably, and to record information on the optical disk with the optimum recording power regardless of the type of the optical disk. is there.

According to a second aspect of the present invention, in the optical disk recording apparatus according to the first aspect, the optical disk discriminating means determines whether the reflected light intensity level is greater than a predetermined value. The type is determined as a phthalocyanine-based optical disk, and if the inclination of the reflected light intensity level is smaller than a predetermined value, the type of the optical disk is determined as a cyanine-based optical disk. When the optical disk is determined to be a system optical disk, the timing is switched to the timing for sampling and holding the B value in the second half of the pit portion. When the type of optical disk is determined to be a phthalocyanine optical disk, the timing for sampling and holding the B value in the first half of the pit portion is switched. To switch to The B value change is large in the latter half of the pit portion, and the B value can be sampled and held in the phthalocyanine-based optical disc in response to the large B value change in the first half of the pit portion, so that the B value detection sensitivity is more accurate. There is an effect that it can be made.

According to the method of recording information on an optical disk according to a third aspect of the present invention, prior to actual recording of information, a test write is performed by irradiating the optical disk with a laser beam. The information is read to determine the optimum power of the laser light, and when the actual information is recorded using the optimum power, the laser light is reflected based on the B value, which is the intensity of light reflected from a pit formed by laser light irradiation. In the method for recording information on an optical disk, wherein information is recorded on the optical disk while correcting the optimum power of the information, the information recorded in the special information of the optical disk or the magnitude of the gradient of the reflected light intensity level accompanying a change in the writing power of the laser light. Then, the type of the optical disk is determined, and the B value is sampled and held according to the type of the optical disk based on the determination result. Switching, the type of optical disk can be determined even for an optical disk of a new disk maker, and furthermore, the B value can be determined in response to the difference in the response of reflected light at the time of pit formation depending on the type of optical disk. By changing the sample timing, the detection sensitivity of the B value can be made equal irrespective of the type of the optical disc, so that there is an effect that the running OPC can be performed more stably.

According to a fourth aspect of the present invention, in the method of recording information on an optical disk according to the third aspect, the pit portion has a timing of irradiating a laser beam. If the type of the optical disc has a time width 11T which is 11 times the reference time width T and the type of the optical disc is a cyanine-based optical disc, a sample of the B value is sampled at the timing of the latter half of the pit portion which is 4T or later of the time width 11T. In the case of a phthalocyanine optical disk, the B value is sampled and held at the timing of the first half of the pit portion, which is 2 to 3T of the time width 11T. The B value changes greatly, and in the phthalocyanine-based optical disc, the B value changes in response to the large B value change in the first half of the pit. Can Ruhorudo, therefore, there is an effect that the B value detection sensitivity more can be accurately ones.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an optical disk recording device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a light output control circuit in the optical disc recording device.

FIG. 3 is a diagram showing a method of determining the type of an optical disc.

FIG. 4 is a diagram showing a sample timing depending on a difference between optical disks.

FIG. 5 is a diagram showing a power 15 test of PCA and a change in a B value in a cyanine optical disk and a phthalocyanine optical disk.

FIG. 6 is a diagram showing changes in reflected light levels of a cyanine-based optical disc and a phthalocyanine-based optical disc with respect to light output.

FIG. 7 is a diagram showing a change in a B value / peak value with respect to a change in a write power (Write Power) of an LD.

[Explanation of symbols]

 Reference Signs List 1 laser diode 2 monitoring photodiode 3 servo / RF photodiode 4 APC circuit 5 optical output control circuit 6 loop filter circuit 7 peak detection circuit 8 sample hold circuit 9 timing control circuit 10 B value / peak value calculation circuit 11 optical disk

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5D090 AA01 BB03 BB07 CC01 CC16 CC18 HH07 JJ12 5D119 AA23 BA01 BB02 DA01 FA05 HA17 HA19 HA45

Claims (4)

[Claims] A light source for forming a pit portion on which information is recorded by irradiating the optical disc with a laser beam; and writing the laser beam based on a B value as a reflected light intensity from a rear end portion of the pit portion. An optical disc recording apparatus comprising: an optical output control unit for correcting power; an optical disc discriminating unit for discriminating a type of an optical disc from a magnitude of a gradient of a reflected light intensity level from a pit portion due to a change in writing power of the light source; An optical disc recording apparatus, comprising: timing control means for switching a timing at which the B value is sampled and held according to the type of the optical disc determined by the optical disc determination means. 2. The optical disc recording apparatus according to claim 1, wherein the optical disc discriminating means discriminates the type of the optical disc as a phthalocyanine-based optical disc if the magnitude of the gradient of the reflected light intensity level is larger than a predetermined value, and outputs the reflected light. If the magnitude of the gradient of the intensity level is smaller than a predetermined value, the type of the optical disk is determined to be a cyanine-based optical disk. When the type of the optical disk is determined to be a cyanine-based optical disk by the optical disk determination unit, the pit is determined. When the type of the optical disc is determined to be a phthalocyanine-based optical disc by the optical disc discriminating means, the timing is switched to the timing for sampling and holding the B value in the first half of the pit portion. A light source, Click recording device. 3. Prior to actual recording of information, test writing is performed by irradiating the optical disc with laser light, and the test-written information is read to determine the optimum power of the laser light. An optical disc for recording information on an optical disc while correcting the optimum power of the laser light based on a B value as a reflected light intensity from a rear end of a pit formed by laser light irradiation when recording the information In the method of recording information on the optical disc, the type of the optical disc is determined from the information recorded in the special information of the optical disc, or the magnitude of the inclination of the reflected light intensity level accompanying a change in the writing power of the laser light. Switching the timing for sampling and holding the B value in accordance with the type of optical disc. Method of recording information to click. 4. The method for recording information on an optical disk according to claim 3, wherein the pit portion has a time width 11T that is 11 times a reference time width T that is a timing for irradiating a laser beam. If the type of the optical disk is a cyanine-based optical disk, the B value is sampled and held at the timing of the latter half of the pit portion that is 4T or later of the time width 11T. A method for recording information on an optical disc, characterized in that a B value is sampled and held at a timing of a first half of a pit portion which is 2 to 3T of a width 11T.