JP3300807B2 - Optical information recording device and optical information recording method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an optical information recording apparatus and an optical information recording method for recording information by irradiating a recording medium with a light beam modulated according to a recording signal.

[0002]

2. Description of the Related Art Conventionally, there is an optical information recording apparatus for recording information by using, for example, a semiconductor laser as a light emitting means and irradiating a recording medium with a light beam emitted from the semiconductor laser. The recording medium used in this optical information recording device is:
This optical disk is a magneto-optical disk on which data is magnetically recorded / erased and the recorded data is optically reproduced, and the recording layer has an amorphous state and a crystalline state. There is a phase change optical disk that erases, records, and reproduces data by irradiating a recording layer with light to change the phase by utilizing the difference in light reflectance.

At present, the above-mentioned phase change optical disk is a disk having a diameter of 120 mm, which is the same as a so-called compact disk, and is capable of recording, erasing, and reproducing data a plurality of times, PD (Phase change Dual), CD-RW ( Co
mpact Disc-Rewritable), DVD-RAM (Digital Vid
eo Disc-Random Access Memory).

At the time of data recording on a magneto-optical disk in a conventional optical information recording apparatus, if data has already been recorded, first, an erasing operation for erasing recorded data at the first rotation of the magneto-optical disk is performed. Then, a recording operation for recording new data is performed at the next rotation of the magneto-optical disk. Further, during the next rotation of the magneto-optical disk, a so-called verify reproduction operation is performed. The verify reproduction operation is an operation of recording a recording signal on the magneto-optical disk and, at the same time, reproducing the recorded recording signal to confirm whether or not the recording signal is correctly recorded.

As described above, when data is overwritten on the magneto-optical disk, the magneto-optical disk is rotated three times, and it takes time to record data.

In order to increase the speed in an optical information recording apparatus using the above-described magneto-optical disk, laser light used for the above-described erasing, recording, and reproducing operations is required. Three semiconductor lasers are mounted. Accordingly, three optical components corresponding to these semiconductor lasers are mounted, respectively, and the optical components are expensive.

On the other hand, one semiconductor laser is used for the erasing operation and the recording operation.
An optical disk with a phase change or the like that can perform erasing and recording operations simultaneously by laser light from the one semiconductor laser has been developed. This optical disk is called an overwrite medium.

As a method of recording data on the overwrite medium, a mark length recording method is used in which data is used as a mark and a mark having a length corresponding to the modulated data is recorded. In this mark length recording method,
In order to accurately record a mark in a desired shape, a recording waveform control technique for intermittently outputting the power of a laser beam has been used.

[0009]

Incidentally, in the above optical information recording apparatus, even when the above-mentioned overwrite medium is used, a semiconductor laser for a reproducing operation in a verify reproducing operation is required. Two semiconductor lasers, one for operation and the other for reproduction, are provided. Therefore, two optical system components corresponding to these semiconductor lasers are mounted, respectively, and it is desired to further reduce the cost of these optical system components to achieve cost reduction.

When recording data in the optical information recording apparatus, the overwrite medium is rotated twice for the erasing / recording operation and the reproducing operation, so that the data recording speed is slower than the data reproducing speed and it takes time.

Accordingly, the present invention provides an optical information recording apparatus and an optical information recording method capable of easily performing data recording in a short time and reducing the cost of an optical system component to reduce the cost. The purpose is to provide.

[0012]

In order to solve the above-mentioned problems, an optical information recording apparatus according to the present invention comprises an optical information recording apparatus for recording information by irradiating a recording medium with a light beam modulated according to a recording signal. In the recording apparatus, a recording signal detecting unit that detects an amplitude difference before and after a predetermined level of a detection recording signal that detects reflected light of the light beam from the recording medium and outputs an amplitude signal; The amplitude signal of, compared with a preset reference value, and a recording signal determining means for determining the recording state of the recording signal on the recording medium ,
The recording signal detecting means keeps the detection recording signal for a predetermined time.
Delay means for delaying the detection record signal and the delay means
Addition of the sum signal with the delayed detection recording signal from the stage
Calculating means, and a predetermined level of the sum signal from the adding means.
Detection method that outputs a pulse signal when a sum signal of
Stage and before and after the output of the pulse signal from the detection means
Of the sum signal from the adding means, and
Amplitude detection means for outputting a signal.
You.

Further , the recording signal determination means includes an amplitude reference value output means for outputting a predetermined amplitude reference value of the amplitude signal, a predetermined amplitude reference value from the amplitude reference value output means and the amplitude detection means. And a determination unit for determining the recording state of the recording signal on the recording medium based on the comparison value from the comparison unit.

Further , the optical information recording apparatus of the present invention has a recording signal
Irradiating the recording medium with a light beam modulated according to the
In an optical information recording apparatus for recording information, the light beam
Of the detection recording signal obtained by detecting the reflected light from the recording medium
Outputs an amplitude signal by detecting the amplitude difference before and after a predetermined level
Recording signal detecting means, and vibration from the recording signal detecting means.
The width signal is compared with a preset reference value, and the
A recording signal determination method for determining the recording state of a recording signal on a medium
And a delay means for delaying the detection recording signal by a predetermined time, and an addition means for obtaining a sum signal of the detection recording signal and the delayed detection recording signal from the delay means. Detecting means for outputting a pulse signal when a sum signal of a predetermined level out of the sum signals from the adding means is detected; and reproducing the sum signal from the adding means using the pulse signal from the detecting means. Reproduction clock generation means for generating a reproduction clock to be reproduced, and amplitude detection means for detecting an amplitude difference between the sum signal from the addition means and outputting an amplitude signal before and after the reproduction clock is output from the reproduction clock generation means. And characterized in that:

At this time, the recording signal determination means includes an amplitude reference value output means for outputting a predetermined amplitude reference value of the amplitude signal, a predetermined amplitude reference value from the amplitude reference value output means, and the amplitude detection means. A reproducing data generating means for confirmation for generating a reproducing data for confirmation by comparing the amplitude signal from the reproducing signal with the reproducing signal for confirmation from the reproducing data generating means for confirmation and a recording signal before being recorded on the recording medium. And a comparing / judging means for judging the recording state of the recording signal on the recording medium.

Further , the optical information recording method of the present invention provides a recording signal
Irradiating the recording medium with a light beam modulated according to the
An optical information recording method for recording information, comprising:
Of the detection recording signal obtained by detecting the reflected light from the recording medium
Outputs an amplitude signal by detecting the amplitude difference before and after a predetermined level
A recording signal detection step, and
The recording signal on the recording medium
A recording signal determining step of determining a state; a delaying step of delaying the detection recording signal by a predetermined time; an adding step of obtaining a sum signal of the detection recording signal and the delayed detection recording signal; A detection step of outputting a pulse signal when a sum signal of a predetermined level is detected from the signals, and an amplitude detection of detecting an amplitude difference between the sum signals before and after the output of the pulse signal and outputting an amplitude signal And a step.

Further, the recording signal determining step, the amplitude reference value outputting step for outputting a predetermined amplitude reference value of the amplitude signal, a comparing step of comparing the predetermined reference amplitude value and the amplitude signal, the Determining a recording state of a recording signal on the recording medium based on the comparison value.

Further , the optical information recording method of the present invention can
Irradiating the recording medium with a light beam modulated according to the
An optical information recording method for recording information, comprising:
Of the detection recording signal obtained by detecting the reflected light from the recording medium
Outputs an amplitude signal by detecting the amplitude difference before and after a predetermined level
A recording signal detection step, and
The recording signal on the recording medium
A recording signal determination step of determining a state, wherein the recording signal detection step includes a delay step of delaying the detection recording signal by a predetermined time, and a sum signal of the detection recording signal and the delayed detection recording signal. An adding step of obtaining, a detecting step of outputting a pulse signal when a sum signal of a predetermined level of the sum signal is detected, and a reproduction clock generation for generating a reproduction clock for reproducing the sum signal using the pulse signal And an amplitude detecting step of detecting an amplitude difference of the sum signal before and after outputting the reproduced clock and outputting an amplitude signal.

At this time, the recording signal determination step includes an amplitude reference value output step of outputting a predetermined amplitude reference value of the amplitude signal, and a comparison between the predetermined amplitude reference value and the amplitude signal for confirmation. A reproduction reproduction data generating step of generating reproduction data, and comparing the verification reproduction data with a recording signal before being recorded on the recording medium, and determining a recording state of the recording signal on the recording medium. And a determining step.

[0020]

Embodiments of the present invention will be described below in detail.

FIG . 1 shows a schematic configuration of an embodiment of an optical information recording apparatus according to the present invention. The optical information recording apparatus shown in FIG. 1 illustrates a configuration for explaining an erasing operation, a recording operation, and a reproducing operation of a recording signal on a recording medium at the time of data recording. The detailed description and illustration of the signal processing unit are omitted.

The control circuit 11 generates a recording signal by processing and modulating data for recording. The control circuit 11 controls the laser beam emitted from the optical pickup 12 according to the recording signal, so that the optical beam modulated in accordance with the recording signal irradiates the optical disc 7 as a recording medium. Is done. This allows
The data is recorded.

On the optical disc 7, signal recording tracks are formed in advance in a concentric manner. Data is spirally recorded from the inner circumference to the outer circumference of the optical disk 7 along the recording layer 8 of the signal recording track. Incidentally, data may be recorded from the outer periphery toward the center of the optical disk 7.

The optical pickup 12 includes a semiconductor laser 1, a light beam shaping lens 2, and a beam splitter (PB).
S) 3, an objective lens 4, a focus detection lens 5, a so-called photodetector 6 as a detector, and the like.

[0025] During data recording, it said semiconductor laser 1 is controlled by the control circuit 11, laser light of intensity corresponding to the recording signal data is generated to signal processing to be recorded is emitted. The emitted light beam of the laser light is irradiated onto the recording layer 8 of the signal recording track at a desired position via the light beam shaping lens 2, the beam splitter 3, and the objective lens 4. As a result, a mark 9 corresponding to the recording signal is formed on the optical disc 7.

A mark has already been formed on the recording layer 8 of the signal recording track. When data is further recorded on this mark, a new mark 9 is formed at the position where the mark is formed. If so, the above-described recording operation is performed.

When a new mark 9 is not formed at a position where the mark is formed, the semiconductor laser 1 starts to erase the already formed mark.
A laser beam weaker than the laser beam at the time of recording is emitted. The emitted light beam of the laser light is supplied to the light beam shaping lens 2 and the beam splitter 3 similarly to the recording operation.
Then, the light is irradiated onto the mark formed through the objective lens 4. Thereby, the mark is erased.

Further, light reflected by the said light beam irradiated on the optical disc 7, after being separated from the outgoing light by the beam splitter 3 through the objective lens 4 is detected by the photodetector 6 via the focus detection lens 5 Is converted into an electric signal. This electric signal is input to the recording state detection circuit 10 as a detection recording signal.

[0029] The recording state detection circuit 10, the recording signal detection means for outputting an amplitude signal by detecting the amplitude difference before and after the predetermined level of the detected detection recorded signal light reflected from the optical disc 7 of the light beam Certain recording signal detection circuit 20
A recording signal determination circuit 30 that is a recording signal determination unit that compares the amplitude signal from the recording signal detection circuit 20 with a preset reference value to determine the recording state of the recording signal on the recording medium. Is provided.

[0030] The recording signal detection circuit 20 sets the predetermined level to be detected among the detected recording signal inputted advance and, upon detection of the predetermined level of the detection recording signal, outputs a pulse signal I do. This pulse signal is
It has an amplitude corresponding to the amplitude difference before and after the predetermined level. This pulse signal is input to the recording signal determination circuit 30.

[0031] The recording signal determination circuit 30 is preset the amplitude reference value of the pulse signal, the amplitude of the pulse signal the input as compared with the reference value, recorded on the optical disc 7 It is determined whether the recording state of the recording signal is good.

As described above, in the above-mentioned optical information recording device, the reflected light of the light beam by the laser beam during the data recording operation is detected, and at the same time as the recording operation, the so-called verify reproduction which is the operation for confirming the recording state of the recording signal. Actions can be taken.

In order to separate the emitted light and the reflected light, a quarter-wave plate and a polarizing beam splitter are used instead of the beam splitter 3, and the light is split between the polarizing beam splitter and the objective lens 4. A configuration in which a 波長 wavelength plate is inserted may be adopted.

Further, detection and control method of the focus servo signal and tracking servo signal used for controlling the optical pickup 12 may be used a signal processing method which is conventionally performed, and a detailed description thereof will be omitted.

[0035] Next, the recording state detection circuit 10 will be described.

FIG . 2 shows the first reference of the recording state detection circuit 10 .
Shows a schematic configuration of a form of Reference Example 3 shows the state of each signal in Fig. 2 schematically.

The recording signal detection circuit 20 of the recording state detection circuit 10 includes an edge detecting circuit 21 is detecting means for outputting a pulse signal upon detecting a detection recording signal of the predetermined level, from the edge detection circuit 21 And an edge amplitude detecting circuit 22 which is an amplitude detecting means for detecting an amplitude difference between the detected recording signals before and after the pulse signal is output and outputting an amplitude signal.
An edge amplitude reference value output circuit 32 which is amplitude reference value output means for outputting a predetermined amplitude reference value of the amplitude signal;
A comparison circuit 31 serving as comparison means for comparing a predetermined amplitude reference value from the edge amplitude reference value output circuit 32 with an amplitude signal from the edge amplitude detection circuit 22, based on a comparison value from the comparison circuit 31. A determination circuit 3 for determining the recording state of a recording signal on the optical disk 7
3 is included.

[0038] First, for example, recording data is generated by modulating the channel data obtained by modulating the code data. Incidentally, in this first reference example of the form and other forms state shown below, as a recording signal, 1-7RL
Modulated using an L (run-length limited) modulation code,
It is assumed that the recording signal shown in FIG. 3A is used. Therefore, a mark having a length of 2T to 8T is recorded on the optical disk 7. Here, T indicates a reference clock cycle in the optical information recording device. When the recording signal shown in FIG. 3A is recorded on the optical disk 7, the recording waveform is controlled in accordance with the mark to be formed, so that the pulse signal shown in FIG. 3B is output.

When a signal corresponding to the pulse signal shown in FIG. 3B is applied to the semiconductor laser 1, a laser beam for recording is emitted from the semiconductor laser 1, and a light beam of the laser beam irradiates the optical disk 7. Thus, marks 90 and 91 shown in FIG. 3C are formed.

Further, by detecting the reflected light from the optical disc 7 of the light beam upon the formation of the mark 90, 91 is detected recording signal shown in FIG. 3D is obtained.

[0041] The detection recording signal is input to the edge detection circuit 21 and the edge amplitude detection circuit 22 of FIG. The edge detection circuit 21 presets, for example, a detection level R1 as a predetermined level. Then, when the detection recording signal reaches the detection level R1, a pulse signal shown in FIG. 3E is output. That is, this pulse signal is
This is an edge detection signal output when the rising edge and the falling edge of the B pulse signal are detected. The edge detection signal in FIG. 3E is output to the edge amplitude detection circuit 22.

The edge amplitude detection circuit 22 detects and measures the amplitude before and after the timing at which the edge detection signal shown in FIG. 3E is output in the detection recording signal shown in FIG. 3D, and measures the amplitude by using this amplitude difference as an amplitude. An edge amplitude signal shown in FIG. 3F is output.

[0043] Thus, the recording signal detection circuit 20 detects the amplitude difference of reflected light before and after the rising edge and falling edge of the detection recording signal FIG. 3D, from the optical disc 7 of the light beam for recording operation be able to.

The edge amplitude signal output from the edge amplitude detection circuit 22 is input to the comparison circuit 31 of the recording signal determination circuit 30.

[0045] Here, the edge amplitude reference value output circuit 32, a predetermined amplitude reference value of the edge amplitude signal of Figure 3F is preset. This amplitude reference value is, for example, a value within a predetermined range as shown by amplitude reference values 60a and 60b shown in FIG. 3F. The edge amplitude reference value output circuit 32 outputs the amplitude reference values 60a and 60b to the comparison circuit 31.

[0046] The comparator circuit 31, the edge amplitude reference value 60a from the amplitude reference value output circuit 32, and 60b, compares the edge amplitude signal from the edge amplitude detection circuit 22, the amplitude signal the amplitude reference It is detected whether it is within the range of the values 60a and 60b. When the amplitude exceeds the range of the amplitude reference values 60a and 60b, an alarm signal, for example, is output to the determination circuit 33 as a comparison value.

[0047] The determination circuit 33 based on the alarm signal, determines a recording state of the recording signal on the optical disc 7, and outputs the determination result to the control circuit 11. Specifically, in the determination circuit 33, an upper limit value of a recording signal that is not normally recorded is set in advance for each sector indicating a recording unit of data on the optical disk 7 or for each block including a plurality of sectors. When the number of input alarm signals exceeds the upper limit, the control circuit 1 shown in FIG.
1 to output an error signal.

Since the edge amplitude signal in FIG. 3F is within the amplitude reference values 60a and 60b, the judgment circuit 33
May output a signal indicating a good recording state.

[0049] Further, FIG. 3D edge detection levels R1 and the predetermined amplitude reference values 60a, 60b are, and characteristics of each optical disk, by learning each sector or characteristics of each block of one optical disc, each The value may be changed to a value suitable for the characteristics of each optical disk, each sector or each block.

The control circuit 11 of FIG . 1 performs error processing when an error signal is input. In this error processing, the data at the location where the error has occurred is confirmed and repaired. For example, in the same sector where an error has occurred, E
If the data can be easily repaired by CC (Error Correction Code), leave it as it is. But ECC
However, if the data cannot be repaired, or if the data needs to be repaired at the time of reproduction up to the ECC capacity limit, the sector in which this error has occurred is replaced with another sector, and the data is repaired. The data may be repaired not only in the sector unit but also in the block unit.

Next, using each signal state shown in FIG. 4, will be described such a case where the recording signal is not recorded normally.

[0052] Here, the pulse signal of the recording data and 4B of Figure 4A is the same as the pulse signal of the recording data and 3B in Figure 3A.

[0053] For example, when the defective portion by a metal piece or the like is present occurs on the optical disk 7 is detected recording signal is influenced by the defect. Specifically, when dust or the like is present at a position on the optical disc 7 corresponding to the portion formed at the time t1 of the mark 90, for example, after the mark 90 corresponding to the recording signal shown in FIG. The detection level of the detection recording signal in FIG. 4D becomes higher than the detection level of the detection recording signal in FIG. 3D at time t1.

[0054] Also, when overwriting data on the optical disc 7, the mark signal recorded earlier absorbs light beam for recording, the detection level of the detection recording signal drops. More specifically, FIG.
When the C mark 92 is recorded, this mark 9
4C, the detection level of the detection recording signal in FIG. 4D is lower than the detection level of the detection recording signal in FIG. 3D at time t2.

[0055] As described above, in the case of when and overwrite operation exists defect is detected level of the detection recording signal changes, the timing of the rising edge and falling edge of the recording signal, normally recorded Since the operation is the same as when the operation is performed, the edge detection signal detected by the edge detection circuit 21 using the detection recording signal is as shown in FIG.
As shown in E, the edge detection signal is the same as the edge detection signal of the normally recorded recording signal shown in FIG. 3E.

The edge amplitude signal output from the edge amplitude detection circuit 22 is as shown in FIG. 4F.

[0057] Here, when affected by the defect on the optical disc 7, the amplitude difference between the rising and falling edges of the detection recording signal of FIG. 4D at time t1 is, when it is normally recorded The amplitude difference between the rising edge and the falling edge of the detection recording signal of FIG. 3D at the same time is larger than that of FIG.
At 1 the value is outside the range of the predetermined amplitude reference values 60a and 60b. Accordingly, a signal indicating that the value is outside the range of the predetermined amplitude reference values 60a and 60b is output from the determination circuit 3 shown in FIG.
3 is output.

[0058] Thus, since use of the amplitude difference before and after the rising and falling edges of the detected detected recorded signal in accordance with the recorded the recording signal, the optical disk 7
Even when there is a defective portion on the top, it is possible to accurately detect that the recording was not performed normally.

When the overwriting operation is performed, the operation shown in FIG.
Only the detection level of the detection recording signal of D at time t2 is relatively lower than the detection level at other times, and the amplitude difference between the rising edge and the falling edge of the detection recording signal of FIG. This is the same as the amplitude difference between the rising edge and the falling edge of the 3D detection recording signal. Therefore, the edge amplitude signal in FIG. 4F has a value within the range of the predetermined amplitude reference values 60a and 60b, and a signal indicating that the value is within the range of the predetermined amplitude reference values 60a and 60b is shown in FIG. It is output to the judgment circuit 33.

[0060] Thus, in the overwrite operation, when the optical disk 7 is rotated 1, the erase operation of the data recording operation and performs simultaneously only one light beam, since the verify reproducing operation can be carried out simultaneously, The data recording speed can be made the same as the data reproduction speed, and data can be recorded at high speed.

Further, since there is no influence from the already recorded marks 92, an overwrite medium can be used as the optical disk 7, and a CD-R (Compact Disc-Recordable) which can be written only once, DV
A write-once recording medium such as a DR (Digital Video Disc-Recordable) can also be used.

Next, in FIG. 5, the recording state detection circuit 10
2 shows a schematic configuration of the embodiment of FIG.
2 schematically shows the state of each signal in FIG.

[0063] The configuration and the processing operation of the recording signal detection circuit 20 in the recording state detection circuit 10 shown in FIG. 5 is the same as the configuration and the processing operation of the recording signal detection circuit 20 shown in FIG. 2, a detailed description Is omitted. The recording signal and the detected recording signal are shown in FIGS. 3A to 3F.

The recording signal determination circuit 30 shown in FIG . 5 includes an edge amplitude reference value output circuit 32 which is an amplitude reference value output means for outputting a predetermined amplitude reference value of the edge amplitude signal, and an edge amplitude reference value output circuit. A binarization circuit 34, which is a binarization means for comparing a predetermined amplitude reference value from E.32 with an edge amplitude signal from the edge amplitude detection circuit 22 and outputting a binarized signal; A determination circuit 33 for determining the recording state of the recording signal on the optical disk based on the binarized signal from the optical disc;

In the second embodiment, the edge amplitude signal is binarized to determine the recording state of the recording signal.

The edge amplitude signal of FIG . 6A is the same as the edge amplitude signal of FIG. 3F, and is input to the binarization circuit 34. When the amplitude of the edge amplitude signal is within the range of predetermined amplitude reference values 60a and 60b, the binarization circuit 34 outputs the binarization signal shown in FIG. 6B at intervals of T / 2 seconds. That is, the binarized signal is a signal indicating the rising edge and the falling edge of the detected recording signal when the recording signal is normally recorded. This binarized signal is input to the determination circuit 33.

The determination circuit 33 determines the input binary signal by a predetermined determination process, and outputs a signal indicating the determination result to the control circuit 11.

[0068] Here, FIG. 7 shows a flowchart of a determination procedure in the determination circuit 33. This determination process is a process of determining a mark recording state by detecting an inter-mark signal between a certain mark and a mark following the mark.

[0069] First, at step S1, after the recording gate signal outputted from the control circuit 11 is a ON, within a predetermined time, from a binary signal of FIG. 6B, the top portion of one mark '1001' It is determined whether or not it has been detected. As a result, if it is determined that the head “1001” has not been detected, the process proceeds to step S2, where an error signal is output,
In step S3, the process waits until detecting "0000" indicating a signal between marks between marks.

[0070] On the other hand, in step S1, a leading portion '100
If it is determined that 1 'has been detected, the process proceeds to step S4, and after T / 2 seconds, an edge indicating the edge of the detected recording signal is displayed.
It is determined whether or not 1 'has been detected.

[0071] Thus, if it is determined that not detected '1', i.e., if it is judged that it has detected a '0', the process proceeds to step S5, then, were detected the '000' It is determined whether or not.

[0072] Thus, if it is judged that it has detected the '000', together with the detected "0" in step S4, and thus detecting a mark among signal '0000'.

[0073] On the other hand, in step S5, if it is determined that not detected '000', the process proceeds to step S6, and outputs an error signal, at step S7, detect a mark between the signal '0000' Wait until.

[0074] Further, in step S4, if it is judged that it has detected a '1', the process proceeds to step S8, after the further T / 2 seconds, it is determined whether or not an odd number detecting '1' .

[0075] Thus, if a '1' is determined to have an odd number detected, it is determined that it was possible to detect correctly the mark, the flow advances to step S9, the mark between the signals 00
It is determined whether or not 00 'has been detected.

[0076] Thus, if it is judged that it has detected the '0000', and the detection of the successful inter-mark signal.

[0077] On the other hand, in step S8, '1'
When it is determined that an odd number has not been detected, or when it is determined in step S9 that '0000' has not been detected, the process proceeds to step S6, where an error signal is output. '000
Wait until 0 'is detected.

[0078] When determining the successive marks is performed continuously aforementioned determination process.

In the second embodiment, the recording state of the recording signal is determined for each mark by recognizing the mark pattern. This makes it possible to cope with omission in edge detection.

Next, in FIG. 8, the recording state detection circuit 10
3 shows a schematic configuration of the embodiment of FIG.
2 schematically shows the state of each signal in FIG.

[0081] The configuration and the processing operation of the recording signal detection circuit 20 in the recording state detection circuit 10 shown in FIG. 8 is the same as the configuration and the processing operation of the recording signal detection circuit 20 shown in FIG. 2, a detailed description Is omitted. The recording signal and the detected recording signal are shown in FIGS. 3A to 3F.

The recording signal determination circuit 30 shown in FIG . 8 includes an edge amplitude reference value output circuit 32 which is an amplitude reference value output means for outputting a predetermined amplitude reference value of the edge amplitude signal, and an edge amplitude reference value output circuit. A binarizing circuit 3 which is a binarizing means for comparing a predetermined amplitude reference value from the M.32 with an amplitude signal from the edge amplitude detecting circuit and outputting a binarized signal.
4, a delay circuit 35 which is a delay means for delaying the binary signal from the binary circuit 34 for a predetermined time, a binary signal from the binary circuit 34 and a delay from the delay circuit 35 The verify reproduction data generation circuit 36, which is a verification reproduction data generation means for generating the verification reproduction data by comparing the binarized signal with the binary signal, and the verify reproduction data from the verification reproduction data generation circuit 36 and the verification data. A comparison / judgment circuit 37 which is a comparison / judgment means for judging the recording state of the recording signal on the optical disk by comparing the recording signal before recording.

In the embodiment of the third embodiment, the second embodiment
Using the binarized signal of the edge amplitude signal similar to the binarized signal generated in the example mode and a signal obtained by delaying the binarized signal by a predetermined time, verify reproduction data for a verify reproduction operation is obtained. Then, the recording state of the recording signal is determined using the verify reproduction data.

The binarization circuit 34 of FIG . 8 performs the same processing as the binarization circuit 34 of FIG. For example, the edge amplitude signal of FIG. 6A is input to the binarization circuit 34, and the amplitude of the edge amplitude signal is set to a predetermined amplitude reference value 60a,
When it is within the range of 60b, the binarized signal shown in FIG. 9A is output at an interval of T / 2 seconds. That is, the binarized signal is a signal indicating the rising edge and the falling edge of the detected recording signal when the recording signal is normally recorded. This binarized signal is input to the verify reproduction data generation circuit 36 and also to the delay circuit 35.

The delay circuit 35 delays the input binary signal by T / 2 seconds and outputs the binary signal shown in FIG. 9B to the verify reproduction data generation circuit 36. Note that this delay time can be made variable between 0 and T seconds.

The verify reproduction data generation circuit 36 generates the verify reproduction data shown in FIG. 9C by using the two binarized signals, and outputs it to the comparison / judgment circuit 37. Specifically, the sum (mod) of the two binary signals
2) may be calculated and output every T seconds, or may be calculated and output by processing described later.

[0087] The comparison and decision circuit 37, the verify reproduction data, as compared to the recording signal before recording outputted from the control circuit 11 determines a recording state of the recording signal, a signal indicating the determination result Output to the control circuit 11. For example, if the verify reproduction data and the recording signal before recording do not match, it is regarded as an error, and the number of errors is added.
When the number of errors exceeds a predetermined value, an error signal is output to the control circuit 11.

[0088] Here, FIG. 10 shows a flowchart of a processing procedure in the verify reproduction data generating circuit 36. Here, the combination of the binarized signal of FIG. 9A and the delayed binarized signal of FIG. 9B is (a, b).

[0089] First, at step S11, after the recording gate signal outputted from the control circuit 11 is a ON,
By detecting the state of (a, b) = (1,0),
It detects that it is the leading edge of the mark, and at the same time, outputs “1” as verify reproduction data.

[0090] Next, in step S12, after T seconds, '
Outputs 0 '.

[0091] Next, in step S13, after T seconds,
It is determined whether (a, b) = (0, 1). As a result, if it is determined that (a, b) = (0, 1) has not been detected, the process proceeds to step S14, outputs '0' as verify reproduction data, and returns to the process of step S12.

[0092] On the other hand, in step S13, (a, b) =
If it is determined that (0, 1) has been detected, step S
Proceed to 15 to output '1'.

[0093] Thus, initially, in step S11 (a, b) by detecting a = (1, 0), and outputs the identifying the leading edge of a mark '1', then, (a , B) =
'0' is output every T seconds until (0,1) is detected, and finally (a, b) = (0,1) is detected again to identify the trailing edge of the mark, '1' in step S15
Is output. Therefore, for example, in the case of the 2T mark which is the shortest mark, the process proceeds to step S15 after the process of step S13 without performing the process of step S14, and ends.

[0094] In step S15, after outputting a '1', the process proceeds to step S16, after further T seconds, (a,
b) It is determined whether or not = (1, 0) is detected. As a result, if it is determined that (a, b) = (1, 0) has not been detected, the process proceeds to step S17, where '0' is output, and the process of step S16 is performed again.

[0095] On the other hand, in step S16, (a, b) =
If it is determined that (1, 0) has been detected, step S
The process proceeds to step S18, where "1" indicating the leading edge of the next mark is output, and the process returns to step S12 to process the next mark.

In the third embodiment, the detection recording signal is binarized and compared with the recording signal before recording, so that not only detection of occurrence of an error is output, but also error rate and error The occurrence location can be accurately detected and output.

[0097] Next, in FIG. 11, the recording state detection circuit 10
The schematic configuration of the first embodiment is shown, and FIG. 12 schematically shows the state of each signal in FIG.

[0098] configuration and the processing operation of the recording signal determination circuit 30 in the recording state detection circuit 10 shown in FIG. 11 is the same as the configuration and the processing operation of the recording signal determination circuit 30 shown in FIG. The recording signal, the pulse signal corresponding to the recording laser beam, and the mark are shown in FIGS. 3A to 3C.

The recording signal detection circuit 20 shown in FIG . 11 includes a delay circuit 23 serving as delay means for delaying the detection recording signal by a predetermined time, and a delay circuit 23 for detecting the detection recording signal and the delayed detection recording signal from the delay circuit 23. An adder 24 which is an addition means for obtaining a sum signal; an edge detection circuit 21 which is a detection means for outputting a pulse signal when a sum signal of a predetermined level among the sum signals from the adder 24 is detected; The addition circuit 2 before and after the pulse signal is output from the detection circuit.
And an edge amplitude detection circuit 22 which is an amplitude detection means for detecting an amplitude difference of the sum signal from the signal No. 4 and outputting an edge amplitude signal.

The detection recording signal shown in FIG. 12A is input to the delay circuit 23 and is delayed by T / 2 seconds, so that the delayed detection recording signal shown in FIG.
4 is output.

[0102] The adder 24, the detection recording signal and said delayed detection recording signal is input, a sum signal of the two detecting recording signals shown in FIG. 12C is calculated. This sum signal is supplied to an edge detection circuit 21 and an edge amplitude detection circuit 22.
Is output to

[0102] The edge detecting circuit 21 is set in advance, for example, detection level R2 as a predetermined level. When the sum signal reaches the detection level R2,
The pulse signal shown in FIG. 12D is output. That is, this pulse signal is applied to each of the marks 90 and 91 in FIG.
This is an edge detection signal before and after the rising edge of the first pulse signal and the falling edge of the last pulse signal of the B pulse signal. The edge detection signal in FIG. 12D is output to the edge amplitude detection circuit 22.

The edge amplitude detection circuit 22 detects and measures the amplitude of the sum signal of FIG. 12C before and after the timing at which the edge detection signal of FIG. 12D is output, and measures the amplitude difference as the edge of FIG. Outputs an amplitude signal.

[0104] Thus, the recording signal detection circuit 20, in each mark 90, 91 in FIG. 3C, before and after the falling edge of the first pulse signal of the rising edge and the last pulse signal in the pulse signal in FIG. 3B In addition, it is possible to detect the amplitude difference of the light beam for the recording operation reflected from the optical disk 7.

The edge amplitude signal output from the edge amplitude detection circuit 22 is input to the comparison circuit 31 of the recording signal determination circuit 30.

[0106] Here, the edge amplitude reference value output circuit 32, a predetermined amplitude reference value of the edge amplitude signal of Figure 12E is preset. This amplitude reference value is, for example, as shown in FIG.
This is a value within a predetermined range as shown by the amplitude reference values 62a and 62b shown by E. The edge amplitude reference value output circuit 32
The amplitude reference values 62a and 62b are output to the comparison circuit 31.

[0107] The comparator circuit 31, the edge amplitude reference value 62a from the amplitude reference value output circuit 32, and 62b, compares the edge amplitude signal from the edge amplitude detection circuit 22, the amplitude signal the amplitude reference It is detected whether the value is within the range of the values 62a and 62b. When the amplitude exceeds the range between the amplitude reference values 62a and 62b, an alarm signal, for example, is output to the determination circuit 33 as a comparison value.

[0108] The determination circuit 33 based on the alarm signal, determines a recording state of the recording signal on the optical disc 7, and outputs the determination result to the control circuit 11.

[0109] Thus, in the first embodiment, performs verification reproduction operation using the edge amplitude signals leading and trailing edges only of the recorded mark, since the determination of recording states of the recording signal, A signal processing circuit used for normal data reproduction can be commonly used.

[0110] Next, in FIG. 13, the recording state detection circuit 10
FIG. 14 shows a schematic configuration of the second embodiment, and FIG. 14 schematically shows the state of each signal in FIG.

In the description of the second embodiment,
The recording signal, the pulse signal corresponding to the recording laser beam, and the mark are shown in FIGS. 3A to 3C.

[0112] The recording signal detection circuit 10, the detection record signal is a delay means for a predetermined time delay delay circuit 2
3, an adder 24 serving as an adding means for obtaining a sum signal of the detection record signal and the delayed detection record signal from the delay circuit 23, and a sum of a predetermined level of the sum signal from the adder 24. An edge detection circuit 21 which is a detecting means for outputting a pulse signal when a signal is detected; and a reproduction for generating a reproduction clock for reproducing the sum signal from the adder 24 using the pulse signal from the edge detection circuit 21. A reproduction clock generation circuit 25 serving as a clock generation means, and an amplitude difference between a sum signal from the adder 24 before and after the reproduction clock is output from the reproduction clock generation circuit 25 is detected to output an edge amplitude signal. An edge amplitude detection circuit 22 serving as an amplitude detection means;
An edge amplitude reference value output circuit 32 which is amplitude reference value output means for outputting a predetermined amplitude reference value of the amplitude signal;
Confirmation reproduction data generation for comparing the predetermined amplitude reference value from the edge amplitude reference value output circuit 32 with the edge amplitude signal from the edge amplitude detection circuit 22 to generate verify reproduction data as confirmation reproduction data. The verify reproduction data generation circuit 36, which is a means, compares the verify reproduction data from the verify reproduction data generation circuit 36 with the recording signal before being recorded on the optical disk 7, and records the recording signal on the optical disk 7. A comparison / judgment circuit 37 which is a comparison / judgment means for judging a state.

[0113] Delay circuit 23 in FIG. 13, the adder 24 and the edge detection circuit 21, described in the fourth embodiment, the delay circuit 23 of FIG. 11, the adder 24 and the edge detection circuit 2
The same processing as in step 1 is performed. Therefore, the detection recording signal shown in FIG. 12A is input to the delay circuit 23 and is delayed by T / 2 seconds, so that the delayed detection recording signal shown in FIG. 12B is output to the adder 24.

[0114] The adder 24, the detection recording signal and said delayed detection recording signal is input, a sum signal of the two detecting recording signals shown in FIG. 14A is calculated. This sum signal is supplied to an edge detection circuit 21 and an edge amplitude detection circuit 22.
Is output to

The edge detection circuit 21 previously sets, for example, a detection level R2 as a predetermined level. When the sum signal reaches the detection level R2,
The pulse signal shown in FIG. 14B is output. That is, this pulse signal is applied to each of the marks 90 and 91 in FIG.
This is an edge detection signal that detects the rising edge of the first pulse signal and the falling edge of the last pulse signal of the B pulse signal. The edge detection signal in FIG. 14B is output to the recovered clock generation circuit 25.

A reference clock is input from the control circuit 11 to the reproduction clock generation circuit 25. Based on the reference clock, the reproduced clock generation circuit 25 uses the edge detection signal to generate the reference clock shown in FIG.
A reproduction clock having a period of T seconds shown in C is generated. The cycle of the reproduction clock is the same as the cycle of the recording clock at the time of data recording, and is output to the edge amplitude detection circuit 22.

The edge amplitude detection circuit 22 detects and measures the amplitude of the sum signal of FIG. 14A before and after the timing at which the reproduced clock of FIG. 14C is output, and uses this amplitude difference as the amplitude to obtain the edge amplitude of FIG. 14D. Output a signal.

[0118] Thus, the recording signal detection circuit 20, detecting the amplitude difference between the reflected light before and after the rising edge and the falling edge of the pulse signal in FIG. 3B, from the optical disc 7 of the light beam for recording operation Can be.

The edge amplitude signal output from the edge amplitude detection circuit 22 is input to the verify reproduction data generation circuit 36 of the recording signal determination circuit 30.

[0120] Here, the edge amplitude reference value output circuit 32, a predetermined amplitude reference value of the edge amplitude signal of Figure 14D is set in advance. This amplitude reference value is, for example, as shown in FIG.
D is a value within a predetermined range as shown by the amplitude reference values 63a, 63b, and 63c. The edge amplitude reference value output circuit 32 outputs the amplitude reference values 63a, 63b, 63c to the verify reproduction data generation circuit 36.

[0121] The verify playback data generating circuit 36
When the edge amplitude signal is input, the amplitude reference values 63a, 63a from the edge amplitude reference value output circuit 32
It is detected whether or not the amplitude of the edge amplitude signal from the edge amplitude detection circuit 22 is within the range of 3b. If the amplitude of the edge amplitude signal is within the range of the amplitude reference values 63a, 63b, the verification reproduction data is set to '
1 'is output. Further, the amplitude of the edge amplitude signal is
If it is within the range of the amplitude reference value 63c, "0" is output as the verify reproduction data. Thereby, the verify reproduction data of FIG. 14E is obtained. This verify reproduction data is output to the comparison / judgment circuit 37.

[0122] The comparison and decision circuit 37, the verify reproduction data, as compared to the recording signal before recording outputted from the control circuit 11 determines a recording state of the recording signal, a signal indicating the determination result Output to the control circuit 11. For example, if the verify reproduction data and the recording signal before recording do not match, it is regarded as an error, and the number of errors is added.
When the number of errors exceeds a predetermined value, an error signal is output to the control circuit 11.

[0123] Thus, in the second embodiment, it is possible to easily generate an edge amplitude signal used in generating the verification reproduced data. As a result, the verify reproduction data can be easily generated, and the recording state of the recording signal can be determined accurately and at high speed.

[0124]

As described above, the optical information recording apparatus of the present invention is an optical information recording apparatus for recording information by irradiating a recording medium with a light beam modulated in accordance with a recording signal. A recording signal detecting means for detecting an amplitude difference before and after a predetermined level of a detection recording signal obtained by detecting a reflected light of the beam from the recording medium and outputting an amplitude signal; and an amplitude signal from the recording signal detecting means, Recording signal determination means for determining a recording state of a recording signal on the recording medium in comparison with a set reference value, thereby irradiating the optical disk with a light beam modulated by a recording waveform control technique. When performing data recording, the erasing operation and the recording operation at the time of data recording can be performed at the same time, and the so-called verify reproduction operation using the reflected light from the optical disk can be performed at the same time. Since, at the time of data recording, the optical disk when the one rotation, it is possible to perform erasing operation, the recording operation and the verify reproduction operation at the same time. Therefore, data recording can be performed at high speed. That is, the data recording speed can be made equal to the data reproduction speed. Furthermore, one optical pickup can be used for the erasing operation, the recording operation, and the reproducing operation, and the cost for the optical system components can be reduced, and the cost of the optical information recording device can be reduced.

Here, the recording signal detecting means delays the detection recording signal by a predetermined time , obtains a sum signal of the detection recording signal and the delayed detection recording signal, and determines a predetermined level of the sum signal. A pulse signal is output when the sum signal is detected, and by detecting the amplitude difference of the sum signal before and after the output of the pulse signal and outputting the amplitude signal, only the leading edge and the trailing edge of the mark are output. Is detected and the verify reproduction operation is performed to determine the recording state of the recording signal. Therefore, a signal processing circuit used for normal data reproduction can be commonly used, and the cost of the optical information recording apparatus can be reduced. it can.

Further , the recording signal determining means outputs a predetermined amplitude reference value of the amplitude signal, and based on a comparison value obtained by comparing the predetermined amplitude reference value with the amplitude signal, the recording signal on the recording medium is determined. Since the recording state of the recording signal is determined by detecting the recording state of the recording signal as an amplitude signal, it can be easily determined whether or not the recording has been normally performed .

[0127] Also, the recording signal detection means, said detection recording signal by a predetermined time delay, determine the sum signal of the detection recording signal and the delayed detected recording signal, a predetermined level of said sum signal A pulse signal is output when the sum signal is detected, a reproduced clock for reproducing the sum signal is generated using the pulse signal, and an amplitude difference between the sum signal before and after the output of the reproduced clock is detected. By outputting the amplitude signal, the edge amplitude signal used when generating the verify reproduction data can be easily generated.

At this time, the recording signal determination means outputs a predetermined amplitude reference value of the amplitude signal, compares the predetermined amplitude reference value with the amplitude signal, and generates reproduction data for confirmation. By comparing the confirmation reproduction data with the recording signal before being recorded on the recording medium and determining the recording state of the recording signal on the recording medium, the verify reproduction data can be easily generated. The signal recording state can be determined accurately and at high speed. Therefore, high-speed data recording can be realized.

[0129] Further, the optical information recording method of the present invention, an optical information recording method for recording information by irradiating a light beam modulated in response to the recording signal on the recording medium, from the recording medium of the light beam A recording signal detection step of detecting an amplitude difference before and after a predetermined level of a detection recording signal that has detected reflected light, and outputting an amplitude signal; and comparing the amplitude signal with a preset reference value, A recording signal determination step of determining a recording state of a recording signal on a medium, the data recording is performed even when performing data recording by irradiating an optical beam modulated by a recording waveform control technique onto an optical disc. Erasing and recording operations at the same time,
Since a so-called verify reproduction operation can be performed at the same time using the reflected light from the optical disk, the erase operation, the recording operation, and the verify reproduction operation can be performed simultaneously when the optical disk makes one rotation during data recording. Therefore, data recording can be performed at high speed. That is, the data recording speed can be made equal to the data reproduction speed. Furthermore, one optical pickup can be used for the erasing operation, the recording operation, and the reproducing operation, and the cost for the optical system components can be reduced, and the cost of the optical information recording device can be reduced.

[0130] Here, the recording signal detection step, the addition steps and, the sum of obtaining a delay step of delaying said detection recording signal by a predetermined time, a sum signal of the detection recording signal and the delayed detected recorded signal A detection step of outputting a pulse signal when a sum signal of a predetermined level is detected from the signals, and an amplitude detection of detecting an amplitude difference between the sum signals before and after the output of the pulse signal and outputting an amplitude signal And a step of detecting the leading edge and trailing edge of the mark to perform the reproducing operation and determine the recording state of the recording signal. Therefore, it is possible to commonly use a signal processing circuit for normal data reproduction. As a result, the cost of the optical information recording device can be reduced.

[0131] Also, the recording signal determining step, the amplitude reference value outputting step for outputting a predetermined amplitude reference value of the amplitude signal, a comparing step of comparing the predetermined reference amplitude value and the amplitude signal, the Determining the recording state of the recording signal on the recording medium based on the comparison value, thereby detecting and determining the recording state of the recording signal as an amplitude signal. Can be easily determined .

[0132] Also, the recording signal detection step, a delay step of delaying said detection recording signal by a predetermined time, an adding step of obtaining a sum signal of the detection recording signal and the delayed detected recorded signal, the sum signal Detecting a sum signal of a predetermined level among them, outputting a pulse signal, generating a reproduced clock for reproducing the sum signal using the pulse signal, and outputting the reproduced clock. An amplitude detection step of detecting an amplitude difference of the sum signal before and after the time and outputting an amplitude signal, thereby easily generating an edge amplitude signal used when generating the verify reproduction data. .

At this time, the recording signal judging step includes an amplitude reference value output step of outputting a predetermined amplitude reference value of the amplitude signal, and a comparison between the predetermined amplitude reference value and the amplitude signal. A reproduction reproduction data generating step of generating reproduction data, and comparing the verification reproduction data with a recording signal before being recorded on the recording medium, and determining a recording state of the recording signal on the recording medium. And the determination step, the verify reproduction data can be easily generated, so that the recording state of the recording signal can be determined accurately and at high speed. Therefore, high-speed data recording can be realized.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of an optical information recording apparatus according to the present invention.

FIG. 2 is a schematic configuration diagram of a form of a first reference example of a recording state detection circuit;

FIG. 3 is a diagram schematically showing a state of each signal in FIG. 2;

FIG. 4 is a diagram schematically showing states of other signals in FIG. 2;

FIG. 5 is a schematic configuration diagram of a second reference example of a recording state detection circuit;

FIG. 6 is a diagram schematically showing a state of each signal in FIG. 5;

FIG. 7 is a flowchart illustrating a determination processing procedure of a determination circuit in FIG. 5;

FIG. 8 is a schematic configuration diagram of a third embodiment of the recording state detection circuit;

FIG. 9 is a diagram schematically showing a state of each signal in FIG. 8;

FIG. 10 is a flowchart showing a processing procedure of a verify reproduction data generation circuit of FIG. 8;

FIG. 11 is a schematic configuration diagram of a first embodiment of a recording state detection circuit.

FIG. 12 is a diagram schematically showing a state of each signal in FIG. 11;

FIG. 13 is a schematic configuration diagram of a second embodiment of the recording state detection circuit.

FIG. 14 is a diagram schematically showing a state of each signal in FIG. 13;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Semiconductor laser 7 ... Optical disk 8 ... Recording layer 9 ... Mark 10 ... Recording state detection circuit 11 ... Control circuit 12 ... Optical pick-up 20 ... Recording signal detection circuit DESCRIPTION OF SYMBOLS 21 ... Edge detection circuit 22 ... Edge amplitude detection circuit 23 ... Delay circuit 24 ... Adder 25 ... Reproduction clock generation circuit 30 ... Recording signal judgment circuit 31 ... Comparison circuit 32 ... Edge amplitude reference value output circuit 33..

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-329467 (JP, A) JP-A-7-65379 (JP, A) JP-A-1-243238 (JP, A) JP-A-59-1979 218635 (JP, A) JP-A-57-94937 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B ^7/ 00-7/013 G11B 7/125

Claims (8)

(57) [Claims] 1. A light beam modulated according to a recording signal.
Optical information recording device that records information by irradiating
In the detection of the reflected light of the light beam from the recording medium.
Detects the amplitude difference before and after a predetermined level of the output recording signal and
A recording signal detecting means for outputting a signal; and an amplitude signal from the recording signal detecting means.
The recording signal on the recording medium
Comprising a determining recording signal determination unit status, and the recording signal detection means includes a delay means for delaying said detection recording signal by a predetermined time, the delayed detected recorded signal from the detection record signal and the delay means Adding means for obtaining a sum signal of the following; detecting means for outputting a pulse signal when a sum signal of a predetermined level is detected among the sum signals from the adding means; and before and after the output of the pulse signal from the detecting means the optical information recording apparatus shall be the; and a amplitude detection means for outputting an amplitude signal by detecting the amplitude difference of the sum signal from said adding means. 2. The apparatus according to claim 1, wherein said recording signal determination means comprises: an amplitude reference value output means for outputting a predetermined amplitude reference value of said amplitude signal; a predetermined amplitude reference value from said amplitude reference value output means; 2. A comparison means for comparing the amplitude signal of the recording medium with the amplitude signal, and a determination means for determining a recording state of the recording signal on the recording medium based on a comparison value from the comparison means. Optical information recording device. 3. A light beam modulated according to a recording signal.
Optical information recording device that records information by irradiating
In the detection of the reflected light of the light beam from the recording medium.
Amplitude detecting an amplitude difference before and after the predetermined level of the output recording signal
A recording signal detecting means for outputting a signal; and an amplitude signal from the recording signal detecting means.
The recording signal on the recording medium
Comprising a determining recording signal determination unit status, and the recording signal detection means includes a delay means for delaying said detection recording signal by a predetermined time, the delayed detected recorded signal from the detection record signal and the delay means Adding means for obtaining a sum signal of the following; a detecting means for outputting a pulse signal when a sum signal of a predetermined level is detected from the sum signals from the adding means; and the adding using the pulse signal from the detecting means. A reproducing clock generating means for generating a reproducing clock for reproducing the sum signal from the means; and detecting and detecting an amplitude difference between the sum signal from the adding means before and after outputting the reproducing clock from the reproducing clock generating means. the optical information recording apparatus you comprising an amplitude detecting means for outputting a signal. 4. An amplitude reference value output means for outputting a predetermined amplitude reference value of the amplitude signal; a predetermined amplitude reference value from the amplitude reference value output means; Comparing the amplitude signal with the reproduction signal for confirmation to generate reproduction data for confirmation; and the reproduction data for confirmation from the reproduction data for confirmation and the recording signal before being recorded on the recording medium. 4. An optical information recording apparatus according to claim 3 , further comprising: a comparing / determining means for comparing the recording state of the recording signal on the recording medium by comparing the recording conditions. 5. A light beam modulated according to a recording signal.
Optical information recording method of recording information by irradiating
In the detection of the reflected light of the light beam from the recording medium.
Detects the amplitude difference before and after a predetermined level of the output recording signal and
A recording signal detection step of outputting a signal; and comparing the amplitude signal with a preset reference value.
Determining the recording state of the recording signal on the serial recording medium recording signal
A determination step consists, the recording signal detection step, an adding step of obtaining a delay step of delaying said detection recording signal by a predetermined time, a sum signal of the detection recording signal and the delayed detected recorded signal, the A detection step of outputting a pulse signal when a sum signal of a predetermined level is detected from the sum signal; and an amplitude for detecting an amplitude difference between the sum signals before and after the output of the pulse signal and outputting an amplitude signal. the optical information recording how to comprising a detection step. 6. The recording signal determining step includes an amplitude reference value outputting step of outputting a predetermined amplitude reference value of the amplitude signal; a comparing step of comparing the predetermined amplitude reference value with the amplitude signal; 6. The optical information recording method according to claim 5 , further comprising: determining a recording state of a recording signal on the recording medium based on the comparison value. 7. A light beam modulated according to a recording signal.
Optical information recording method of recording information by irradiating
In the detection of the reflected light of the light beam from the recording medium.
Detects the amplitude difference before and after a predetermined level of the output recording signal and
A recording signal detection step of outputting a signal; and comparing the amplitude signal with a preset reference value.
A recording signal for determining a recording state of a recording signal on a recording medium
A determination step consists, the recording signal detection step, an adding step of obtaining a delay step of delaying said detection recording signal by a predetermined time, a sum signal of the detection recording signal and the delayed detected recorded signal, the A detection step of outputting a pulse signal when a sum signal of a predetermined level of the sum signal is detected; a reproduction clock generation step of generating a reproduction clock for reproducing the sum signal using the pulse signal; of before and after the output, an optical information recording how to comprising the an amplitude detection step of outputting an amplitude signal by detecting the amplitude difference of the sum signal. 8. The recording signal determination step includes: outputting an amplitude reference value for outputting a predetermined amplitude reference value of the amplitude signal; comparing the predetermined amplitude reference value with the amplitude signal; A confirmation reproduction data generating step of generating data; comparing the confirmation reproduction data with a recording signal before being recorded on the recording medium to determine a recording state of the recording signal on the recording medium; The optical information recording method according to claim 7 , further comprising: a determination step.