JPH08306044A - Optical disk recording device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To reduce the time required for a recording operation without lowering the reliability of recorded data. SOLUTION: An irradiation unit that records data on the recording surface of the optical disc by irradiating the recording surface of the optical disc with the laser beam, and a detection unit that detects the amount of the laser beam reflected from the recording surface of the optical disc. Comparing means for comparing whether or not the amount of reflected light exceeds a predetermined range,
And a verifying unit for performing a verifying operation when the amount of reflected light exceeds a predetermined range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device for recording data on an optical disc.

[0002]

2. Description of the Related Art For example, in a magneto-optical disk recording apparatus, when data is recorded in a certain area of the magneto-optical disk, if the data has already been written in the area, the data is erased once and then a new data is written. Data is recorded. When foreign matter adheres to the recording surface of the magneto-optical disk, the laser light emitted from the light source is blocked by the foreign matter, and a sufficient amount of laser light necessary for writing data is generated on the magneto-optical disk. Sometimes did not reach the recording surface. In this case, the data may not have been written correctly. In order to avoid such a situation, when recording data on a magneto-optical disk, the data is always reproduced after the recording, and an operation of confirming whether or not the data is surely recorded is performed. It was
Then, if the recording is not correctly performed, another area is searched for in the same magneto-optical disk and recording is performed again there.

[0003]

In the prior art as described above, when data is recorded on the optical disk, old data is erased, new data is recorded, and the recorded data is reproduced and correctly recorded. It was always necessary to perform three operations to confirm whether or not it was possible. The operation of verifying whether or not the recorded data can be played back correctly is called verify.

Therefore, in order to record data on the optical disk, it is necessary to trace the optical head three times with respect to the area for recording data, which causes a problem that it takes time. An object of the present invention is to reduce the time required for a recording operation without reducing the reliability of recorded data.

[0005]

[Means for Solving the Problems] In order to solve the above problems,
The present invention provides an irradiation means for recording data on the recording surface of the optical disk by irradiating the recording surface of the optical disk with laser light, and a detection means for detecting the amount of the laser light reflected from the recording surface of the optical disk. The comparison means for comparing whether or not the reflected light quantity exceeds a predetermined range, and the verifying means for performing a verify operation when the reflected light quantity exceeds a predetermined range .

Further, the verifying means reproduces the data by irradiating the laser beam from the area where the data is recorded on the recording surface, and judges whether or not the data is correctly recorded. May be
The present invention also relates to erasing means for erasing the data recorded on the recording surface of the optical disc by irradiating the laser light, and the laser light to the area on the recording surface of the optical disc where the data is erased by the erasing means. The recording means for recording data by irradiating with, the detecting means for detecting the reflected light amount of the laser beam from the recording surface of the optical disk when being erased, and the reflected light amount are predetermined. A configuration including a comparison unit that compares whether or not the range is exceeded, and a verify unit that performs a verify operation after recording the data in the recording unit when the reflected light amount exceeds a predetermined range. And

Further, the verifying means reproduces the data by irradiating the laser beam from the area where the data is recorded on the recording surface, and judges whether or not the data is correctly recorded. May be
The present invention also relates to erasing means for erasing the data recorded on the recording surface of the optical disc by irradiating the laser light, and the laser light to the area on the recording surface of the optical disc where the data is erased by the erasing means. The recording means for recording data by irradiating with, the detecting means for detecting the reflected light amount of the laser beam from the recording surface of the optical disk when being erased, and the reflected light amount are predetermined. A comparison means for comparing whether or not the range is exceeded, and a configuration for performing a recording operation in an area different from the area in which data is erased when the reflected light amount exceeds a predetermined range.

Further, in the recording operation, the data may be recorded by the recording means after the data is erased by the erasing means. In addition, a configuration may be provided in which a control unit that increases or decreases the intensity of the laser light for recording is provided according to the reflected light amount for erasing.
Further, according to the present invention, an irradiation means for irradiating a recording surface of an optical disk with a laser beam to record data on the recording surface, and a light receiving section for receiving a reflected light of the laser light from the recording surface of the optical disk. And a focus error signal generating means for generating a focus error signal from an output signal from the light receiving portion, and a comparing means for comparing whether or not the level of the focus error signal exceeds a predetermined range, A verifying means is provided for performing a verifying operation when the level of the focus error signal exceeds a predetermined range.

Further, the verifying means reproduces the data by irradiating the laser beam from the area where the data is recorded on the recording surface, and determines whether or not the data is correctly recorded. May be
Further, according to the present invention, an irradiation means for irradiating a recording surface of an optical disk with a laser beam to record data on the recording surface, and a light receiving section for receiving a reflected light of the laser light from the recording surface of the optical disk. A focus error signal generating means for generating a focus error signal from an output signal from the light receiving portion, and a comparing means for comparing whether or not the level of the output signal of the light receiving portion exceeds a predetermined range. And a verifying means for performing a verifying operation when the level of the output signal exceeds a predetermined range.

Further, the verifying means reproduces the data by irradiating the laser beam from an area where the data is recorded on the recording surface, and judges whether or not the data is correctly recorded. May be
Further, according to the present invention, an irradiation means for irradiating a recording surface of an optical disk with a laser beam to record data on the recording surface, and a light receiving section for receiving a reflected light of the laser light from the recording surface of the optical disk. A tracking error signal generating means for generating a tracking error signal from the output signal from the light receiving portion, and a comparing means for comparing whether or not the level of the tracking error signal exceeds a predetermined range, It may be configured to include a verifying unit that performs a verifying operation when the level of the tracking error signal exceeds a predetermined range.

Further, the verifying means reproduces the data by irradiating the laser beam from an area where the data is recorded on the recording surface, and determines whether or not the data is correctly recorded. May be
Further, according to the present invention, an irradiation means for irradiating a recording surface of an optical disk with a laser beam to record data on the recording surface, and a light receiving section for receiving a reflected light of the laser light from the recording surface of the optical disk. A tracking error signal generating means for generating a tracking error signal from an output signal from the light receiving portion, and a comparing means for comparing whether or not the level of the output signal of the light receiving portion exceeds a predetermined range. And a verifying means for performing a verifying operation when the level of the output signal exceeds a predetermined range.

Further, the verifying means reproduces the data by irradiating the laser beam from the area on the recording surface in which the data is recorded, and judges whether or not the data is correctly recorded. May be
Further, according to the present invention, an irradiation means for irradiating a recording surface of an optical disk with a laser beam to record data on the recording surface, and a light receiving section for receiving a reflected light of the laser light from the recording surface of the optical disk. Comparing the servo signal generating means for generating a servo control signal from the output signal from the light receiving part with the servo control signal level exceeds a predetermined range. Means and
A verifying unit may be provided to perform a verifying operation when the level of the servo control signal exceeds a predetermined range.

Further, a constitution may be provided in which a control means for controlling the intensity of the laser light at the time of recording is provided according to the reflected light amount at the time of erasing. Further, the recording means may be configured to include a control means for controlling the intensity of the laser light at the time of recording according to the reflected light amount at the time of recording. Further, the detection means has a scattered light detection means for detecting the amount of scattered light of the reflected light from the optical disc, the comparison means, the light amount of the scattered light exceeds a predetermined range. It may be configured to compare whether or not there is.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIG. 1 is a perspective view of an optical disk recording apparatus according to the first embodiment. The semiconductor laser 1 emits laser light. The laser light is applied to the recording surface of the optical disc 7, and recording, reproduction, erasing, etc. are performed on the optical disc 7. The collimator lens 2 is an optical element for converting the divergent light emitted by the semiconductor laser 1 into parallel light. The first beam splitter 3 and the second beam splitter 4 are optical elements that split an optical path by transmitting or reflecting laser light. The objective lens 6 is
The laser light is focused on the recording surface of the optical disk 7 with almost no aberration, and the light scattered or diffracted by the tracks or marks on the recording surface of the optical disk 7 is collected. The foreign matter detection light receiving element 17 receives the scattered light from the optical disk 7. Based on the amount of received light, it is determined whether there is a foreign substance or the like on the recording surface of the optical disc 7. The flip-up mirror 5
The objective lens 6 receives the laser light transmitted through the beam splitter 4.
The laser beam that is guided to the laser beam or reflected on the recording surface of the optical disk 7 and transmitted through the objective lens 6 is incident on the beam splitter 4 again.

The servo detecting detector 10 is used to detect whether or not the laser light is focused on the recording surface of the optical disk 7. That is, a focus error signal is generated by the output of the servo detection detector 10, and this focus error signal is used for controlling so that the laser beam is always focused on the recording surface of the optical disc 7. Alternatively, the servo detection detector 10 is
It is used to detect whether or not the light spot formed on the recording surface of the optical disk 7 by the irradiation of the laser light is at the center of the track formed on the recording surface. That is, a tracking error signal is generated by the output of the servo detection detector 10, and this tracking error signal is used to perform control so that the light spot is always located at the center of the track. Generally, a plurality of concentric circular or spiral recording tracks are formed on the recording surface of an optical disc. These tracks are often formed by providing concentric or spiral grooves on the recording surface. Data is recorded along this track.

The cylindrical lens 9 shapes the beam of the laser light incident from the servo lens 8. The light receiving element 15 enters a part of the laser light reflected by the first beam splitter 3. The emitted light amount of the semiconductor laser 1 is adjusted by the incident light amount. Playback lens 13
Causes the laser light reflected on the recording surface of the optical disk 7 to be focused on the light receiving surface of the reproduction signal detector 14.

The laser light emitted from the semiconductor laser 1 is collimated by the collimator lens 2 and is incident on the first beam splitter 3. Then, the laser light reflected in the beam splitter passes through the semi-transparent mirror of the second beam splitter 4, the optical path of which is bent by the flip-up mirror 5, and enters the objective lens 6. Then, the light is focused on the recording surface of the optical disk 7. The laser light scattered or diffracted by the tracks or marks on the recording surface of the optical disk 7 enters the objective lens 6 again. Then, it returns to the second beam splitter 4. Part of the laser beam that has passed through the objective lens 6 is reflected by foreign matter or the like on the recording surface of the optical disc 7, and is received by the foreign matter detection light receiving element 17 as scattered light. The laser light reflected by the semi-transparent mirror surface of the second beam splitter 4 passes through the half-wave plate 11 and the polarization beam splitter 12 and enters the reproducing lens 13, where the laser light is condensed and reproduced. It is incident on the light receiving surface of the signal detector 14. The laser light transmitted through the semi-transparent mirror of the second beam splitter 4 goes to the semi-transparent mirror surface of the first beam splitter 3 and is reflected by the surface in two directions. The laser light reflected in the first direction is incident on the light receiving element 15, and the emitted light quantity of the semiconductor laser 1 is adjusted by the incident light quantity. The laser light reflected in the second direction passes through the servo lens 8 and is then beam-shaped by the cylindrical lens 9, and is received by the servo detection detector 10.

FIG. 2 shows a processing procedure of a recording operation of the optical disk recording apparatus according to the first embodiment. When recording data on the optical disk 7, if old data has already been written in the area where new data is to be recorded, the old data is once erased (FIG. 2S2).
01). The level V of the output signal from the foreign substance detection light receiving element 17 during the erasing operation and the level Vref of the preset reference signal are obtained (S202 in FIG. 2). And V and Vr
and ef are compared (S203 in FIG. 2). If V is always lower than Vref during the erasing operation, the erasing operation is completed (S204 in FIG. 2) and the recording operation is started (S20 in FIG. 2).
5). After the recording operation is completed, the verify operation is not performed and the process ends (S206 in FIG. 2).

On the other hand, during the erase operation, if the output signal level V from the foreign matter detection light receiving element 17 exceeds the preset level Vref of the reference signal even once, the erase operation is completed ( 2S207), a recording operation is performed (FIG. 2S208), and then a verify operation is performed (FIG. 2S209). FIG. 3 shows V and Vref during erase.
It is a figure which shows the example of a change of. On the way, V exceeds Vref. In this case, the verify operation is performed after erasing and recording are completed.

When reproduction is performed for the verify operation, if a read error occurs and reproduction cannot be performed normally, error correction is carried out. If error correction is possible (as a result of error correction, If the data can be reproduced), the recording is ended (S210, S212 in FIG. 2).
When the error cannot be corrected (when the data cannot be reproduced normally even if the error correction is tried), the recording area is changed and the erasing operation is started again (S210 and S21 in FIG. 2).
1). (Second Embodiment) FIG. 4 shows a processing procedure of a recording operation of an optical disk recording apparatus according to a second embodiment.

The apparatus of the second embodiment differs from the apparatus of the first embodiment in the processing procedure of the recording operation of the optical disk recording apparatus. The processing procedure of the recording operation of the optical disc recording apparatus according to the second embodiment will be described below. When recording data on the optical disk 7, if old data has already been written in the area where new data is to be recorded, the old data is once erased (S40 in FIG. 4).
1). The level V of the output signal from the foreign substance detection light receiving element 17 during the erasing operation and the level Vref of the preset reference signal are obtained (S402 in FIG. 4). And V and Vref
And are compared (S403 in FIG. 4). Always V during erase operation
Is less than Vref, the erase operation is completed (S404 in FIG. 4) and the recording operation is started (S405 in FIG. 4).
After the recording operation is completed, the verify operation is not performed and the process ends (S406 in FIG. 4).

On the other hand, during the erasing operation, if the output signal level V from the foreign substance detecting light-receiving element 17 exceeds the preset level Vref of the reference signal even once, after the erasing operation is completed (see FIG. 4S407), it is determined that there is a foreign substance in the area where the erasing operation is performed and normal recording cannot be performed, and the recording operation is not performed in that area. Then, the area to be recorded is changed (S408 in FIG. 4), and the erase operation is started again (S401 in FIG. 4). (Third Embodiment) FIG. 5 is a block diagram of an optical disk recording apparatus according to the third embodiment.

The third embodiment is different from the first embodiment in the processing procedure of the recording operation of the optical disk recording apparatus. The processing procedure of the recording operation of the optical disc recording apparatus according to this embodiment will be described below. When recording data on the optical disk 7, the data recording operation is performed after the area to be recorded is once erased. The semiconductor laser 1 at the time of the recording operation responds to the output signal of the foreign substance detection light receiving element 17 at the time of the erasing operation. The emission power of the laser light is corrected.

When a foreign substance or the like adheres to the optical disc 7, the laser beam is blocked by the foreign substance or the like, and thus the disc 7
Insufficient amount of laser light is irradiated onto the recording surface, and data recording becomes inaccurate. Therefore, a change in the amount of scattered light due to foreign matter or the like is detected by the foreign matter detection light receiving element 17 during the erasing operation. This detected change in the amount of light is added to the amount of light reflected on the recording surface of the optical disk 7 and incident on the light receiving element 15 during data recording, and the emission power of the laser light is adjusted based on the amount of light. As a result, even if there is a foreign substance or the like on the recording surface of the optical disc 7, it is possible to reliably record data by increasing the amount of emitted light.

In FIG. 5, the level of the output current from the foreign matter detection light receiving element 17 becomes large when foreign matter or the like adheres to the optical disk 7. The output current from the foreign matter detection light receiving element 17 is input to the I / V converter 504, converted into a voltage signal, and input to the timing circuit 503. The output current from the light receiving element 15 is input to the I / V converter 502 and converted into a voltage signal. The output voltage from the I / V converter 502 is input to the APC circuit (auto power control circuit) 501. The timing circuit 503 outputs the voltage signal input from the I / V converter 504 when the recording operation is started. At this time, a voltage obtained by adding the output voltage from the I / V converter 502 and the output voltage from the timing circuit 503 is input to the APC circuit 501. The APC circuit 501 controls the drive current of the semiconductor laser 1 based on the input voltage value. (Embodiment 4) FIG. 6 shows a processing procedure of a recording operation of an optical disk recording apparatus according to Embodiment 4.

In the fourth embodiment, since an optical disk (overwritable optical disk) that can be recorded without an erasing operation before the recording operation is used, the recording operation of the optical disk recording apparatus is different from that of the first embodiment. The processing procedure is different. The processing procedure of the recording operation of the optical disc recording apparatus according to this embodiment will be described below. In the fourth embodiment, since the erasing operation is not necessary before the recording operation, the output of the foreign matter detection light receiving element 17 is taken and compared with the reference signal during the recording operation.

When the recording operation is started (S601 in FIG. 6),
The level V of the output signal from the foreign substance detection light receiving element 17 during the recording operation and the level V of the preset reference signal
Obtained as ref (S602 in FIG. 6). Then, V is compared with Vref (S603 in FIG. 6). During recording, V is always Vre
If it is less than f, after the recording operation is completed (S604 in FIG. 6), the verify operation is not performed and the operation is ended (S605 in FIG. 6).

On the other hand, during the recording operation, if the output signal level V from the foreign substance detection light receiving element 17 exceeds the preset level Vref of the reference signal even once, after the recording operation is completed (see FIG. 6S606) and verify operation is performed (S607 in FIG. 6). When it is determined that the data cannot be recorded with high quality, the recording area is changed (S610 in FIG. 6), and the operation of recording the data in the alternative area is performed again (S601 in FIG. 6). (Fifth Embodiment) FIG. 7 is a block diagram of an optical disk recording apparatus according to the fifth embodiment.

In the fifth embodiment, an optical disc (overwritable optical disc) which can be recorded without an erasing operation before the recording operation is used. The processing procedure of the recording operation of the optical disc recording apparatus according to this embodiment will be described below. In the present embodiment, since the erasing operation is not necessary before the recording operation, the foreign matter detection light receiving element 1 is not required during the recording operation.
By adding the output of No. 7 to the output of the light receiving element 15, the emission power of the laser beam during the recording operation is corrected. For example, when a foreign substance or the like adheres to the optical disc, the emitted beam is blocked, so that the amount of light radiated onto the disc becomes insufficient and the reliability of recorded data decreases. Therefore,
The change in scattered light due to foreign matter or the like is detected by the foreign matter detection light receiving element 17 during the recording operation, and the recording power is corrected in real time by the signal. As a result, the amount of laser light can be increased when foreign matter or the like is attached, so that data can be recorded without reducing reliability.

In FIG. 7, the level of the output current from the foreign matter detection light receiving element 17 increases when foreign matter or the like adheres to the optical disk 7. The output current from the foreign matter detection light receiving element 17 is input to the I / V converter 704, converted into a voltage signal, and input to the low pass filter circuit 703.
The output current from the light receiving element 15 is input to the I / V converter 702 and converted into a voltage signal. The output voltage from the I / V converter 702 is input to the APC circuit (auto power control circuit) 701. The low-pass filter circuit 703 smoothes the voltage signal input from the I / V converter 704 and outputs it. At this time, a voltage obtained by adding the output voltage from the I / V converter 702 and the output voltage from the low-pass filter circuit 703 is input to the APC circuit 701. The APC circuit 701 controls the drive current of the semiconductor laser 1 based on the input voltage value. (Sixth Embodiment) FIG. 8 is a block diagram of an optical disk recording apparatus according to the sixth embodiment. In the present embodiment, the method for detecting a foreign substance or the like adhering to the optical disk 7 is the first embodiment.
Different from ~ 5.

Compared to the device of FIG. 1, the device of FIG. 8 does not have the foreign substance detection light receiving element 17, and has the addition circuits 801, 802,
804, a differential circuit 803, a comparator 805, and a reference signal output circuit 806 are added. In the present embodiment, the sum signal of the servo detection detector 10 is used to use the optical disc 7
We have obtained information such as foreign objects above. Here, the servo detection detector 10 is a four-division detector and is used to detect a focus error. Focus error detection
The astigmatism method is used. The outputs from the two diagonal detectors of the four-division detector 10 are added by an adder 801.
, And the outputs from the two diagonal detectors on the other diagonal line are input to the adder 802. Adders 801, 80
From 2, the sum signal of the input signals is output. Output signals from the adders 801 and 802 are input to the differential circuit 803. From the differential circuit 803, the adder 8
The difference signal of the two sum signals from 01 and 802 is output,
This output signal is used as a focus error signal. That is, the objective lens 6 is driven according to this focus error signal, and focus servo control is performed.

The output signals from the adders 801 and 802 are
It is also input to the adder circuit 804. The addition circuit 804 outputs a sum signal of the two input signals. The level of the sum signal output from the adder 804 is usually constant regardless of the focus error. When there is a foreign substance or the like on the optical disk, the level of this signal changes. That is, if there is a foreign substance on the optical disc, the adder 804
The output level from is low. The sum signal output from the adder 804 is input to the comparator 805. Comparator 80
Reference numeral 5 compares the level of the reference signal output from the reference signal output circuit 806 with the level of the sum signal output from the adder 804. In the description of the operations in FIGS. 2, 4, and 6, the verify operation is not performed when the level of the reference signal is higher, but in the present embodiment, the verify operation is performed when the level of the reference signal is lower. If not performed, the same effect as in the case of FIGS.

As described above, the influence of foreign matter or the like can be known and the reliability of data can be secured. (Seventh Embodiment) FIG. 9 is a block diagram of an optical disk recording apparatus according to the seventh embodiment. In the present embodiment, the method for detecting a foreign substance or the like adhering to the optical disk 7 is the first embodiment.
Different from ~ 6.

Compared to the device of FIG. 1, the device of FIG. 9 does not have the foreign substance detection light receiving element 17, and the addition circuits 801, 802,
Differential circuit 803, comparator 805, reference signal output circuit 80
6 is added. In the present embodiment, information such as a foreign substance on the optical disk 7 is obtained by using the one-sided signal from the servo detection detector 10. Here, the servo detection detector 10 is a four-division detector and is used to detect a focus error. The astigmatism method is used for focus error detection. Outputs from two detectors on one diagonal of the four-division detector 10 are input to the adder 801, and outputs from two detectors on the other diagonal are input to the adder 802. The adders 801 and 802 output the sum signals of the input signals. The output signals from the adders 801 and 802 are differential circuits 803.
Is input to From the differential circuit 803, an adder 801,
A difference signal of the two sum signals from 802 is output, and this output signal is used as a focus error signal. That is, the objective lens 6 is driven according to this focus error signal, and focus servo control is performed.

The output signal from the adder 802 is the comparator 8
It is input to 05. When there is a foreign substance or the like on the optical disc, the level of the output signal from the adder 802 changes. That is, when the optical disc has a foreign substance or the like, the output level from the adder 802 becomes low. Comparator 805
Compares the level of the reference signal output from the reference signal output circuit 806 with the level of the signal output from the adder 802. In the description of the operations in FIGS. 2, 4, and 6, the verify operation is not performed when the level of the reference signal is higher, but in the present embodiment, the verify operation is performed when the level of the reference signal is lower. If not performed, the same effect as in the case of FIGS.

As described above, the influence of foreign matter or the like can be known and the reliability of data can be secured. (Embodiment 8) FIG. 10 is a block diagram of an optical disk recording apparatus according to Embodiment 8. In the present embodiment, the method of finding a foreign substance or the like adhering to the optical disc 7 is different from that of the first to seventh embodiments.

Compared to the device of FIG. 1, the device of FIG.
There is no foreign matter detection light receiving element 17, and a differential circuit 807, an addition circuit 808, a comparator 805, and a reference signal output circuit 806 are added. In this embodiment, the sum signal of the servo detection detector 10 is used to obtain information such as a foreign substance on the optical disk 7. Here, the servo detection detector 10
Is a two-divided detector and is used to detect tracking errors. The push-pull method is used for tracking error detection. The outputs from the two detectors of the two-divided detector 10 are input to the differential circuit 807. The differential signal of the two input signals is output from the differential circuit 807, and this output signal is used as a tracking error signal. That is, the objective lens 6 or the mirror 5 is driven according to the tracking error signal to perform tracking servo control.

The outputs from the two detectors of the two-divided detector 10 are also input to the adder circuit 808. The addition circuit 808 outputs a sum signal of the two input signals. The level of the sum signal output from the adder circuit 808 is usually constant regardless of the tracking error while the light beam is following the recording track on the optical disc. When there is a foreign substance or the like on the optical disk, the level of this signal changes. That is, when the optical disc has a foreign substance or the like, the output level from the adder 808 becomes low. The sum signal output from the adder 808 is input to the comparator 805. The comparator 805 compares the level of the reference signal output from the reference signal output circuit 806 with the level of the sum signal output from the adder 808. In the description of the operations in FIGS. 2, 4, and 6, the verify operation is not performed when the level of the reference signal is higher, but in the present embodiment, the verify operation is performed when the level of the reference signal is lower. If not performed, the same effect as in the case of FIGS.

As described above, the influence of foreign matter or the like can be known and the reliability of data can be secured. (Ninth Embodiment) FIG. 11 is a block diagram of an optical disk recording apparatus according to the ninth embodiment. In the present embodiment, the method of finding a foreign substance or the like adhering to the optical disk 7 is different from that of the first to eighth embodiments.

The device of FIG. 11 is compared with the device of FIG.
There is no foreign matter detection light receiving element 17, and a differential circuit 807, a comparator 805, and a reference signal output circuit 806 are added. In the present embodiment, information such as a foreign substance on the optical disk 7 is obtained by using the one-sided signal from the servo detection detector 10. Here, the servo detection detector 10 is a two-divided detector and is used to detect a tracking error. The push-pull method is used for tracking error detection. The outputs from the two detectors of the two-divided detector 10 are input to the differential circuit 807. The differential signal of the two input signals is output from the differential circuit 807, and this output signal is used as a tracking error signal. That is, the objective lens 6 or the mirror 5 is driven according to the tracking error signal to perform tracking servo control.

The output from one detector of the two-divided detector 10 is also input to the comparator 805. When there is a foreign substance or the like on the optical disk, the level of the output signal from the detector of the two-divided detector 10 changes. That is, when the optical disc contains foreign matter or the like, the level of the output signal from the detector becomes low. The comparator 805 compares the level of the reference signal output from the reference signal output circuit 806 with the level of the signal output from one of the detectors. In the description of the operations in FIGS. 2, 4, and 6, the verify operation is not performed when the level of the reference signal is higher, but in the present embodiment, the verify operation is performed when the level of the reference signal is lower. If you don't do
The same effect as in the case of FIGS.

As described above, the influence of foreign matter or the like can be known and the reliability of data can be secured. (Embodiment 10) FIG. 12 is a block diagram of an optical disk recording apparatus according to Embodiment 10. In the present embodiment, the method of finding a foreign substance or the like adhering to the optical disc 7 is different from that of the first to ninth embodiments.

The apparatus shown in FIG. 12 is different from the apparatus shown in FIG.
There is no foreign matter detection light receiving element 17, and a differential circuit 121, an addition circuit 122, a comparator 805, and a reference signal output circuit 806 are added. In this embodiment, a magneto-optical disk is used as the optical disk 7. In the present embodiment, the reproduction signal from the magneto-optical disk 7 is used to obtain information on the foreign matter on the magneto-optical disk 7.

The reproduction signal from the magneto-optical disk 7, that is, the magneto-optical signal is generated as follows. The two laser beams split into the two optical paths by the polarization beam splitter 12 are received by the two reproduction signal detectors 14, and the outputs from the respective reproduction signal detectors are input to the differential circuit 121. The differential circuit 121 outputs a difference signal between the two input signals. This difference signal becomes a reproduction signal (magneto-optical signal).

The outputs from the two reproduced signal detectors 14 are also input to the adder circuit 122. Adder circuit 122
Outputs a sum signal of the two input signals. This sum signal is input to the comparator 805. Since the sum signal of the reproduction signal detector is almost constant without being affected by the change of the reproduction signal, when there is a foreign substance on the optical disk, the adding circuit 122
A change occurs in the output signal of. That is, when there is a foreign substance on the optical disc, the level of the output signal from the adder circuit 122 becomes low. The comparator 805 calculates the level of the reference signal output from the reference signal output circuit 806 and the addition circuit 21.
The level of the sum signal output from 2 is compared. FIG.
In the description of operations in 4 and 6, the verify operation is not performed when the level of the reference signal is higher, but in the present embodiment, the verify operation is not performed when the level of the reference signal is lower. In that case, the same effect as in the case of FIGS.

As described above, the influence of foreign matter or the like can be known and the reliability of data can be secured. (Embodiment 11) FIG. 13 is a block diagram of an optical disk recording apparatus according to Embodiment 11. In the present embodiment, the method of finding a foreign substance or the like adhering to the optical disk 7 is different from that of the first to tenth embodiments.

The device of FIG. 13 is
The foreign matter detection light receiving element 17 is not provided, and the differential circuit 121, the comparator 805, and the reference signal output circuit 806 are added. In this embodiment, a magneto-optical disk is used as the optical disk 7. In the present embodiment, the reproduction signal from the magneto-optical disk 7 is used to obtain information on the foreign matter on the magneto-optical disk 7.

A reproduction signal from the magneto-optical disk 7, that is, a magneto-optical signal is generated as in the tenth embodiment and is output from the differential circuit 121. The output from one of the two reproduction signal detectors 14 is also input to the comparator 805. Each signal from the two reproduction signal detectors changes when there is a foreign substance on the optical disc. That is, when there is a foreign substance on the optical disc, the level of each signal from the two reproduction signal detectors becomes low. The comparator 805 compares the level of the reference signal output from the reference signal output circuit 806 with the level of the signal output from one of the reproduction signal detectors. In the description of the operation in FIGS. 2, 4, and 6, the verify operation is not performed when the level of the reference signal is higher. However, in the case of the present embodiment,
If the verify operation is not performed when the level of the reference signal is lower, the same effect as in the case of FIGS.

As described above, the influence of foreign matter or the like can be known and the reliability of data can be secured. (Embodiment 12) FIG. 14 is a block diagram of an optical disk recording apparatus according to Embodiment 12. In the present embodiment, by providing the diffraction grating 16 between the light source 1 and the optical disc 7, a plurality of spots are irradiated on the optical disc 7, and a part of the reflected light of the spots is used to make a foreign substance or the like on the optical disc 7. Check if there is.

In this embodiment, the diffraction grating 16 is used to irradiate the optical disk 7 with two spots. The first spot is the transmitted light and the second spot is the diffracted light. The light intensity of the second spot is not strong enough to write data on the optical disc. The reproduction signal and the servo signal are generated by the reflected light of the first spot. It is generated in the same way as in the previous embodiment.

The reflected light of the second spot is focused on the detector 141 at a position different from the servo detection detector. Then, the output signal of the detector 141 is input to the comparator 805. Since the intensity of the reflected light by the second spot is almost constant without being affected by the change of the reproduction signal and the servo signal, the change occurs when there is a foreign matter on the optical disk 7. That is, when the optical disc has a foreign substance or the like, the level of the output signal of the detector 141 becomes low. The comparator 805 compares the level of the reference signal output from the reference signal output circuit 806 with the level of the signal output from the detector 141. In the description of the operations in FIGS. 2, 4, and 6, the verify operation is not performed when the level of the reference signal is higher, but in the present embodiment, the verify operation is performed when the level of the reference signal is lower. If not performed, the same effect as in the case of FIGS.

As described above, the influence of foreign matter or the like can be known and the reliability of data can be secured. Further, instead of the diffraction grating 16, two spots can be generated by a Rochon prism or the like. According to Embodiments 1 to 12 as described above, the following effects are obtained. The apparatus of the embodiment detects the amount of reflected light from the optical disc during the data recording operation or the erasing operation, compares the reflected light amount with the reference value, and only when the reflected light amount exceeds the appropriate range, The verify operation will be performed after the recording operation is completed. As a result, the average data recording speed can be improved without impairing the reliability of the data.

Further, the apparatus of the embodiment detects the amount of reflected light from the optical disc during the data erasing operation, compares the amount of reflected light with a reference value, and when the amount of reflected light exceeds an appropriate range, the optical disc Data is recorded in an area other than the area to be recorded above. As a result, the average data recording speed can be improved without impairing the reliability of the data.

Further, the apparatus of the embodiment detects the amount of reflection from the optical disk at the time of recording or erasing data, compares the amount of reflected light with a reference value, and when the amount of reflected light exceeds an appropriate range. For correction, the amount of light emitted from the light source is corrected. As a result, the data recording speed can be improved without impairing the reliability of the data.

[0055]

As described above, according to the present invention, the data recording speed can be improved without impairing the reliability of the data.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a processing procedure of a recording operation of the optical disc recording apparatus according to the first embodiment of the present invention.

FIG. 3 is a diagram showing an output signal from a foreign matter detection light receiving element according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a processing procedure of a recording operation of the optical disc recording apparatus according to the second embodiment of the present invention.

FIG. 5 is a configuration diagram of an optical disc recording device according to a third embodiment of the invention.

FIG. 6 is a diagram showing a processing procedure of a recording operation of an optical disc recording apparatus according to a fourth embodiment of the present invention.

FIG. 7 is a configuration diagram of an optical disk recording device according to a fifth embodiment of the present invention.

FIG. 8 is a configuration diagram of an optical disk recording device according to a sixth embodiment of the present invention.

FIG. 9 is a configuration diagram of an optical disk recording device according to a seventh embodiment of the present invention.

FIG. 10 is a configuration diagram of an optical disk recording device according to an eighth embodiment of the present invention.

FIG. 11 is a configuration diagram of an optical disk recording device according to a ninth embodiment of the present invention.

FIG. 12 is a configuration diagram of an optical disk recording device according to a tenth embodiment of the invention.

FIG. 13 is a configuration diagram of an optical disk recording device according to an eleventh embodiment of the present invention.

FIG. 14 is a configuration diagram of an optical disc recording device according to a twelfth embodiment of the invention.

[Explanation of symbols]

1 ... Semiconductor laser, 2 ... Collimator lens, 3 ...
1st beam splitter, 4 ... 2nd beam splitter, 5 ... Rebound mirror, 6 ... Objective lens, 7 ...
Optical disk, 8 ... Servo lens, 9 ... Cylindrical lens, 10 ... Servo detection detector, 11 ...
・ Half-wave plate, 12 ・ ・ Polarizing beam splitter, 13
..Playback lenses, 14..Playback signal detectors, 15
..Light receiving element, 16 ... Diffraction grating, 17 ... Foreign object detection light receiving element, 121, 801, 802, 804, 808 ..
Adder circuit, 122, 803, 807 ... Differential circuit, 14
1 ... Detector, 805 .. Comparator, 806 .. Reference signal output circuit, 501, 701 .. Auto power control circuit, 502, 504, 702, 704 ..
Current / voltage conversion circuit, 503 ... Timing circuit, 70
3 ... Low-pass filter.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location G11B 20/18 552 9558-5D G11B 20/18 552Z 572 9558-5D 572F 9558-5D 572C

Claims (19)

[Claims] 1. An irradiation means for recording data on the recording surface of the optical disk by irradiating the recording surface of the optical disk with a laser beam, and a detecting means for detecting the amount of the laser beam reflected from the recording surface of the optical disk. Comparing means for comparing whether the reflected light amount exceeds a predetermined range, and verifying means for performing a verify operation when the reflected light amount exceeds a predetermined range. A characteristic optical disk recording device. 2. The verifying means reproduces the data by irradiating the laser beam from an area where the data is recorded on the recording surface, and determines whether the data is correctly recorded. Claim 1 characterized by the above-mentioned.
The optical disk recording device described. 3. Erase means for erasing data recorded on the recording surface of the optical disc by irradiating the laser light, and laser light to the area on the recording surface of the optical disc where the data is erased by the erasing means. Recording means for recording data by irradiating, detecting means for detecting the amount of laser light reflected from the recording surface of the optical disc when being erased, and the range of the amount of reflected light predetermined And a verifying means for performing a verifying operation after recording the data in the recording means when the reflected light amount exceeds a predetermined range. A characteristic optical disk recording device. 4. The verifying means reproduces the data by irradiating the laser beam from an area where the data is recorded on the recording surface, and determines whether the data is correctly recorded. 4. The method according to claim 3,
The optical disk recording device described. 5. An erasing means for erasing the data recorded on the recording surface of the optical disc by irradiating the laser light, and a laser beam for the area on the recording surface of the optical disc where the data is erased by the erasing means. Recording means for recording data by irradiating, detecting means for detecting the amount of laser light reflected from the recording surface of the optical disc when being erased, and the range of the amount of reflected light predetermined And a comparison means for comparing whether or not the amount of light exceeds the predetermined value, and when the amount of reflected light exceeds a predetermined range, the optical disk is characterized by performing a recording operation on an area different from the area where the data is erased. Recording device. 6. The optical disk recording apparatus according to claim 5, wherein, in the recording operation, the data is recorded by the recording means after the data is erased by the erasing means. 7. The optical disk recording apparatus according to claim 3, further comprising control means for increasing or decreasing the intensity of the laser light for recording in accordance with the amount of reflected light for erasing. 8. An irradiation unit for recording data on the recording surface of the optical disk by irradiating the recording surface of the optical disk with a laser beam, and a light receiving unit for receiving the reflected light of the laser beam from the recording surface of the optical disk. A focus error signal generating means for generating a focus error signal from an output signal from the light receiving portion, a comparing means for comparing whether or not the level of the focus error signal exceeds a predetermined range, and An optical disc recording apparatus comprising: a verifying unit that performs a verifying operation when a level of a focus error signal exceeds a predetermined range. 9. The verifying means reproduces the data by irradiating the laser beam from an area where the data is recorded on the recording surface, and determines whether or not the data is correctly recorded. 9. The method according to claim 8,
The optical disk recording device described. 10. An irradiation unit for recording data on the recording surface of the optical disk by irradiating the recording surface of the optical disk with a laser beam, and a light receiving unit for receiving the reflected light of the laser beam from the recording surface of the optical disk. Focus error signal generating means for generating a focus error signal from the output signal from the light receiving part, and comparing means for comparing whether or not the level of the output signal of the light receiving part exceeds a predetermined range. An optical disc recording apparatus comprising: a verifying unit that performs a verifying operation when the level of the output signal exceeds a predetermined range. 11. The verifying means reproduces the data by irradiating the laser beam from an area where the data is recorded on the recording surface, and determines whether or not the data is correctly recorded. The optical disk recording device according to claim 10, wherein 12. An irradiation unit for recording data on the recording surface of the optical disk by irradiating the recording surface of the optical disk with a laser beam, and a light receiving unit for receiving the reflected light of the laser beam from the recording surface of the optical disk. Tracking error signal generating means for generating a tracking error signal from an output signal from the light receiving portion, comparing means for comparing whether or not the level of the tracking error signal exceeds a predetermined range, and An optical disc recording apparatus comprising: a verifying unit that performs a verifying operation when the level of a tracking error signal exceeds a predetermined range. 13. The verifying means reproduces the data by irradiating the laser beam from an area where the data is recorded on the recording surface, and determines whether or not the data is correctly recorded. 13. The optical disk recording device according to claim 12, wherein: 14. An irradiation unit for recording data on the recording surface of the optical disk by irradiating the recording surface of the optical disk with laser light, and a light receiving unit for receiving the reflected light of the laser light from the recording surface of the optical disk. And a tracking error signal generating means for generating a tracking error signal from the output signal from the light receiving part, and a comparing means for comparing whether or not the level of the output signal of the light receiving part exceeds a predetermined range. An optical disc recording apparatus comprising: a verifying unit that performs a verifying operation when the level of the output signal exceeds a predetermined range. 15. The verifying means reproduces the data by irradiating the laser beam from an area where the data is recorded on the recording surface, and determines whether or not the data is correctly recorded. 15. The optical disk recording device according to claim 14, wherein: 16. An irradiation means for recording data on the recording surface of the optical disk by irradiating the recording surface of the optical disk with a laser beam, and a light receiving section for receiving reflected light of the laser beam from the recording surface of the optical disk. Servo signal generating means for generating a signal for servo control from the output signal from the light receiving part and comparing means for comparing whether or not the level of the signal for servo control exceeds a predetermined range And an verifying means for performing a verifying operation when the level of the servo control signal exceeds a predetermined range. 17. According to the amount of reflected light when erasing,
4. The optical disk recording apparatus according to claim 3, further comprising a control unit that controls the intensity of the laser beam when recording. 18. The optical disk recording according to claim 3, wherein the recording means comprises a control means for controlling the intensity of the laser light at the time of recording in accordance with the reflected light amount at the time of recording. apparatus. 19. The detecting means includes scattered light detecting means for detecting the quantity of scattered light in the reflected light from the optical disk, and the comparing means has a range in which the quantity of scattered light is predetermined. 2. The optical disk recording apparatus according to claim 1, wherein the comparison is made as to whether or not the value exceeds.