JPH10269716A - Optical disk apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly and accurately determine whether the write operation is normal or not by previously storing, when defective condition has continued for the preset address during the write operation, such address based on the judgment that probability for generation of defect is high and then verifying the data near the stored address after the end of write operation. SOLUTION: When defective condition has continued for the section longer than the preset section of the arithmetic calculation result by focusing on the arithmetic calculation result of an ATIP data CRC calculating means 5 which is deteriorated depending on deterioration of the writing condition during the write operation to an optical disk 1, such address is stored in a memory of control unit 8 by judging that possibility for generation of defective writing operation is high. The control unit 8 verifies the data near the address stored after the write operation and omits the verification for the data of the other part. Thereby, the data written in the short period can be confirmed whether it is correct or not.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a recordable CD.
The present invention relates to an optical disk device for driving an optical disk such as a -R (compact disk recordable) disk and a rewritable CD-RW (compact disk rewritable) disk.

[0002]

2. Description of the Related Art Since a CD (compact disk) can record a large amount of data and performs digital processing, it can operate stably with respect to noise.
For example, it is widely used as a media for music and the like. In the music CD, if there is a defect such as a scratch on the medium, so-called skipping occurs. As one conventional method for preventing this skipping, a playback apparatus in which information of a track at which a skipping occurs due to a scratch or the like during playback is stored, and thereafter the track playback is not automatically performed. Has been conventionally proposed (for example, JP-A-6-231570). Thus, C
Regarding the reproduction system in D, a technique for controlling the error track so as not to be reproduced thereafter is conventionally known.

[0003] As one type of the CD, a recordable CD-R disc and a rewritable CD-RW disc are also known. These CD-R discs and CD-
Although the same problem occurs in the RW disc, there is another problem that data is normally recorded after the writing operation is completed. In order to solve such a problem, conventionally, after a write operation is completed, a process of reproducing the data and comparing it with recorded data, that is, a so-called verify operation has been performed.

[0004]

As described in the prior art, with respect to a CD-R disc or a CD-RW disc, after completion of writing, it is necessary to confirm whether or not the writing has been performed normally. Verify processing is performed. However, the quality (quality) of the written data
In order to check the data, it is necessary to verify all the written data, and there is a problem that it takes a very long time. Further, if the verification is not performed, it is not known that the abnormal writing has been performed until the data is read at the time of subsequent use or the like, so that the data may be lost in the worst case. According to the present invention, it takes a lot of time to check the quality (quality) of written data, and if this processing is omitted, the inconvenience of data loss may be avoided, and the method can be performed quickly and accurately. It is another object of the present invention to realize an optical disk device that can determine whether a writing operation is normal or abnormal.

[0005]

According to the first aspect of the present invention, an optical head for irradiating an optical disk with a light beam and receiving reflected light from the optical disk, a moving unit for moving the optical head, and a light receiving signal of the optical head Demodulates the wobble signal to obtain ATIP data, and performs CRC of ATIP data.
In a writable optical disc device having means for performing an operation and a control unit for controlling these units, the control unit includes:
A CRC operation result monitoring means for monitoring whether the CRC operation result of the ATIP data is good or bad during writing is provided. During the writing, the CRC operation result becomes defective over a predetermined address. When the states are continuous, it is determined that there is a high possibility that an abnormality has occurred, and the address is stored, and after the end of writing, data near the stored address is verified.

According to a second aspect of the present invention, in the optical disk device of the first aspect, a signal detecting means for sampling a track error signal from a light receiving signal of the optical head and detecting a signal which is likely to cause a track off during writing is provided. When a signal is detected during writing, the address at which the signal is detected is stored, and after the writing is completed, data near the stored address is verified.

According to a third aspect of the present invention, in the optical disk apparatus of the first aspect, a signal detecting means for sampling a focus error signal from a light receiving signal of the optical head and detecting a signal which is likely to be out of focus during writing. When a signal is detected during writing, the address at which the signal is detected is stored, and after the writing is completed, data near the stored address is verified.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the invention described below correspond to the inventions of claims 1 to 3, but the invention of claim 1 is a basic invention. In the optical disk device of the present invention, conditions under which writing is likely to be abnormal are set,
When it is detected that an abnormality presumed due to the condition has occurred, the address is stored, and after the end of the write, only the vicinity of the address is verified. Is characterized in that it can be determined. More specifically, the condition under which the writing is likely to be abnormal is when the CRC operation result of the ATIP data being written has been in a bad state for a longer time than a predetermined section (the invention of claim 1). In addition, when an abnormality that is likely to cause a track off occurs (the invention of claim 2),
This is when an abnormality that is likely to cause defocus has occurred (the invention of claim 3).

In summary, the present invention focuses on the CRC operation result of ATIP data that deteriorates in the same manner as the write state deteriorates when the write state deteriorates during writing. If the defective state continues for a longer time than the set predetermined section, it is determined that there is a high possibility that a write error has occurred, and the address is stored. After the write is completed, only the vicinity of the address is verified. For other parts, the verification is omitted. In addition, other conditions under which writing is likely to be abnormal include, when an error that is likely to cause an out-of-track occurs, or when an error that is likely to cause an out-of-focus occurs. First, the hardware configuration will be described.

FIG. 1 is a functional block diagram showing an example of an embodiment of a main part configuration of an optical disk device of the present invention. In the figure, 1 is an optical disk, 2 is a spindle motor, 3 is an optical head, 4 is an optical head moving means, 5 is an ATIP data CRC calculating means, 6 is a track error signal abnormality detecting means, 7 is a focus error signal abnormality detecting means, Reference numeral 8 denotes a control unit, and LB denotes a laser beam.

The optical disk apparatus shown in FIG. 1 has a spindle motor 2 for supporting and rotating the optical disk 1, and an optical head for irradiating the optical disk 1 with a light beam and receiving the reflected light from the optical disk 1, as in the conventional optical disk apparatus. 3, an optical head moving means 4 for moving the optical head 3, and an ATIP by demodulating a wobble signal from a light receiving signal of the optical head 3.
(Absolute Time In Pregroo
ve: absolute time information) ATIP data CRC calculation means 5 for acquiring data and performing a CRC calculation of the ATIP data.

[0012] The optical disk device of the present invention further includes:
A track error signal from a light receiving signal of the optical head 3 is sampled, and when a value likely to cause a track deviation, that is, when a predetermined threshold level is exceeded, it is determined that a track error signal has failed. Similarly to the means 6, a focus error signal from the light receiving signal of the optical head is sampled, and when a value likely to cause defocus, that is, when a predetermined threshold level is exceeded, it is determined that an abnormality has occurred in the focus error signal. A focus error signal abnormality detecting means 7; The control unit 8 processes the data acquired from the track error signal abnormality detecting means 6, the focus error signal abnormality detecting means 7, and the ATIP data CRC calculating means 5 to generate a signal for controlling the optical head moving means 4. Output. The control unit 8 also has a function of detecting whether a writable disc has been inserted into the apparatus, and a function of performing control as shown in the flow of FIG. 2 described later.

Next, the operation of the optical disk device of the present invention shown in FIG. 1 when writing data will be described. When the optical disk 1 is inserted into the apparatus, the control unit 8 checks whether the disk is writable, and if the disk is writable, performs a process necessary for writing and starts a writing operation. . Then, when the write operation is started, during the write operation,
It always keeps checking whether writing is completed. That is, while writing is not completed, it is checked whether or not NG (failure) has continuously occurred with respect to the result of the CRC calculation of the ATIP data. If NG does not occur continuously, it is checked whether the track error signal is abnormal. If not, it is further checked whether the focus error signal is abnormal.

When an abnormality is found in any of the processes by these checks, the contents of the check and the address at that time are stored in a memory in the control unit 8. Such checking, that is, checking whether there is NG continuation in the CRC calculation result, whether there is an error in the track error signal, and whether there is an error in the focus error signal, is repeatedly executed until the writing operation is completed. In this case, the cycle may be in units of each address, or a longer cycle may be set by using a time measuring means such as a timer. It goes without saying that there is not only one address where an abnormality is found by this check,
All addresses determined to be abnormal before the writing is completed are stored in the control unit 8.

Such a check is performed in parallel with the write operation, and when the write operation is completed, the memory in the control unit 8 is checked in order to know whether or not an abnormal portion exists during the write. If there is an abnormal point,
The address stored in the memory in the control unit 8;
That is, verification is sequentially performed on data in the vicinity of the address where an error may have occurred. In the case of an optical disk device having a configuration in which data to be verified cannot be prepared, the error correction result at the time of reading is good (O
It is also possible to make a determination (verify) by checking whether or not K). After the end of the write operation, when there is no abnormal part, or when there is an abnormal part, as a result of performing the verification,
When it is determined as K), it is determined that the writing has been normally completed, and a series of operations is terminated.

On the other hand, if there is an abnormal portion during writing and the result of the verification indicates a failure (NG), it is determined that this writing operation has not been performed normally, and a series of operations is similarly performed. finish. As described above, in the optical disc device of the present invention, the CRC operation result of the ATIP data being written continues when the defective state continues for a longer time than a predetermined section (the invention of claim 1) or When an abnormality that is likely to be out of focus occurs (invention of claim 2), and when an abnormality that is likely to cause out of focus occurs (invention of claim 3),
Since only the addresses in the vicinity are verified, normality / abnormality of the written data can be confirmed in a short time. The operation of the optical disk device shown in FIG. 1 is shown in the flow.

FIG. 2 is a flow chart showing a flow of main processing at the time of data writing according to an embodiment of the optical disk apparatus of the present invention. In the figure, # 1
To # 8 indicate steps.

At step # 1, writing is started. In step # 2, it is checked whether the writing has been completed. If the writing is not completed, the process proceeds to step # 3, and it is checked whether or not NG (failure) has continuously occurred with respect to the CRC calculation result of the ATIP data (the invention of claim 1). If NG (defective) occurs continuously, the process proceeds to step # 6. In step # 6, the address is stored, and the process returns to step # 2. In addition, as a result of checking in step # 3, NG (defective) is continuously
If no error has occurred, the process proceeds to step # 4, where it is checked whether the track error signal is in an abnormal state (a track is likely to deviate) exceeding the threshold level (the invention of claim 2).

If the track error signal is in an abnormal state exceeding the threshold level, the address is stored in step # 6, and the address is stored again in step # 6.
Return to 2. If the track error signal is not abnormal as a result of the check in step # 4, step #
Proceeding to step 5, it is checked whether or not the focus error signal is in an abnormal state (out of focus is likely to occur) exceeding the threshold level (the invention of claim 3). If the focus error signal is in an abnormal state exceeding the threshold level, the address is stored in step # 6 and the process returns to step # 2.

On the other hand, if the focus error signal is not abnormal as a result of the check in the previous step # 5, the flow returns to the previous step # 2. As described above, when no abnormality has occurred in all of steps # 3 to # 5, it is determined that normal writing has been performed, and other checks are omitted. During the writing operation, such a check is repeated, and when it is detected in step # 2 that the writing is completed, the process proceeds to step # 7. In step # 7, it is checked whether the address of the abnormal part is stored in the memory in the control unit 8. If the address of the abnormal part is not stored, it is determined that a normal write operation has been performed, and the flow of FIG. 2 is terminated.

Also, as a result of checking in step # 7,
If the address of the abnormal location is stored, in step # 8, data near the address is verified to determine whether the writing is normal or abnormal. If it is normal, it is determined that the write operation has been performed normally, and the flow of FIG. 2 ends. If there is an error as a result of the check in step # 8, it is determined that an abnormality has occurred in the write operation, and the flow of FIG. 2 is terminated. Through the above steps # 1 to # 8, an address at which an abnormality is suspected during the write operation is stored, and after the end of the write, a process of verifying only the vicinity of the address is executed.

[0022]

According to the first aspect of the present invention, the CRC operation result of the ATIP data being written is NG.
Check the continuity of (defective state), and if the state of NG (defective) has continued for a longer period than a predetermined section,
The address is stored, and after the end of the write operation, data near the stored address is verified. Therefore, it is possible to easily and quickly confirm whether or not the writing operation has been normally performed as compared with the conventional device.

According to the optical disk apparatus of the second aspect, the first aspect
In the optical disk device described above, an address at which a signal likely to cause an off-track during writing is stored, and after the writing operation is completed, data near the stored address is verified. Therefore, similar to the effect of the optical disk device of claim 1,
It is verified only under the condition where a writing error is likely to occur, in this case, the vicinity of the address where an error has occurred, which is presumed to be a condition likely to cause an off-track, so it is checked whether the writing operation was performed normally in a short time. It becomes possible.

According to the optical disk device of the third aspect, the first aspect
In the optical disk device described above, an address at which a signal that is likely to cause defocus during writing is stored, and after the writing operation is completed, data near the stored address is verified. Therefore, similarly to the effect of the optical disk device according to claim 1 or 2, only a condition in which a writing error is likely to occur, in this case, only the vicinity of the address where an error occurs which is presumed to be due to a condition in which defocus is likely to occur. Since the verification is performed, it is possible to confirm whether or not the writing operation has been normally performed in a short time.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing an example of an embodiment of a main part configuration of an optical disk device of the present invention.

FIG. 2 is a flowchart showing a main processing flow at the time of data writing according to an embodiment of the optical disc apparatus of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical disk, 2 ... Spindle motor, 3 ... Optical head, 4 ... Optical head moving means, 5 ... ATIP data CR
C calculating means, 6: Track error signal abnormality detecting means, 7
... Focus error signal abnormality detection means, 8 ... Control unit

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI G11B 7/00 G11B 7/00 Q 7/09 7/09 BC 19/04 501 19/04 501P

Claims (3)

[Claims] An optical head for irradiating an optical disk with a light beam to receive reflected light from the optical disk, moving means for moving the optical head, and demodulating a wobble signal from a received light signal of the optical head to obtain ATIP data And a controller for controlling the CRC of the ATIP data, and a control unit for controlling these units. The control unit, during writing, performs a CR operation on the ATIP data.
A CRC calculation result monitoring means for monitoring whether the C calculation result is good or bad is provided. If the CRC calculation result indicates that the defective state continues over a predetermined address during writing,
An optical disk device, wherein it is determined that the possibility of occurrence of an abnormality is high, the address is stored, and after writing is completed, data near the stored address is verified. 2. The optical disk device according to claim 1, further comprising: signal detection means for sampling a track error signal from a light receiving signal of the optical head and detecting a signal likely to cause an off-track during writing. When the signal is detected, the address at which the signal is detected is stored, and after the writing is completed,
An optical disk device, wherein the data near the stored address is verified. 3. The optical disk device according to claim 1, further comprising: signal detection means for sampling a focus error signal from a light receiving signal of the optical head and detecting a signal which is likely to cause defocus during writing. When the signal is detected, the address at which the signal is detected is stored, and after the writing is completed,
An optical disk device, wherein the data near the stored address is verified.