JPH0384732A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To shorten spent time by a retrial by disposing a means for judging whether an error signal is caused by the adhesion of a foreign matter on a medium, or by the defective medium, or by the trouble of the device. CONSTITUTION:The device is provided with the means 4 - 6 for scanning an area separated from a recording medium position where the error signal is detected by a prescribed distance in the case that the error signal is detected at the time of recording and reproducing, and the, judging that the error signal is caused by the trouble of the recording and reproducing device in the case that the error signal is detected again. And the device is provided with the means 4 - 6 for consecutively scanning near th recording medium position where the error signal is detected, and then, judging that the foreign matter is made to adhere on the medium 1 in the case that the error signal is consecutively detected before and behind the error detected position beyond the prescribed area. And the device is provided with the means 4 - 6 for consecutively scanning near the recording medium position still more, and then, judging that it is caused by the defect of the medium 1 in the case that the error signal is detected again at the position where the error signal is detected. Thus, it can be distinguished whether the error signal is caused by the adhesion of the foreign matter on the medium, or the defect of the medium, or the trouble of the device, so that the trouble processing time can be shrotened.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an information recording/reproducing device, and in particular, when an error signal is detected in information recorded on an information recording medium, it is difficult to determine the cause of the error signal. The present invention relates to an information recording and reproducing device that can determine whether the

[Conventional technology]

Conventionally, in information recording and reproducing apparatuses that are capable of recording and reproducing desired information on an information recording medium, particularly optical information recording and reproducing apparatuses such as optical disks and magneto-optical disk apparatuses, there has been a problem in that information recording and reproducing apparatuses capable of recording and reproducing desired information on an information recording medium, especially optical information recording and reproducing apparatuses such as optical disks and magneto-optical disk apparatuses, have been subject to problems such as dust and dirt attached to the medium. , tracking errors and focus errors may occur during information recording and reproduction due to foreign matter such as fingerprint smudges. If such a tracking error or focus error occurs and the error cannot be recovered even after several attempts, conventional optical information recording and reproducing devices determine that there is a foreign object on the medium and issue an external warning. was emitting.

(Problem to be Solved by the Invention) However, in the above conventional example, it is difficult to determine whether the tracking error or focus error is actually caused by foreign matter adhering to the medium, or whether it is due to a failure of the device itself or a defect in the medium. I can't do that.

In addition, since retries are repeated many times, there is a problem in that the processing time takes approximately several tens of seconds.

[Means to solve the problem]

When an error signal is detected during information recording and reproduction, the information recording and reproducing apparatus of the present invention scans an area a predetermined distance away from the information recording medium position where the error signal was detected, and when an error signal is detected again, the information recording and reproducing apparatus A means to determine that the device is malfunctioning, and if an error signal is detected during information recording and reproduction,
Continuously scans the vicinity of the information recording medium position where the error signal was detected, and determines that a foreign object has adhered to the medium when error signals are detected continuously beyond a predetermined area before and after the error detection position. When an error signal is detected during information recording and reproduction, the information recording medium is continuously scanned before and after the position of the information recording medium where the error signal was detected, and when the error signal is detected again at the position where the error signal was detected, the medium is defective. and means for determining.

[For production]

When the information recording and reproducing apparatus of the present invention detects an error signal such as a focus error or tracking error signal during information recording and reproducing, it scans an area a predetermined distance away from the information recording medium position where the error signal was detected and re-scans the area. When an error signal is detected, it is determined that the information recording/reproducing device is malfunctioning.
When an error signal is detected during information recording and reproduction, the area around the information recording medium position where the error signal was detected is continuously scanned, and the error signal is continuously detected beyond a predetermined area before and after the error detection position. Sometimes, if it is determined that a foreign object has adhered to the medium and an error signal is detected during information recording/reproduction, the area around the information recording medium position where the error signal was detected is continuously scanned, and the information recording medium is scanned again at the position where the error signal was detected. By determining that a medium is defective when an error signal is detected, it is possible to distinguish whether the error signal is caused by foreign matter adhering to the medium, a medium defect, or a device failure.

〔Example〕

Hereinafter, embodiments of the present invention will be explained in detail using the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of an information recording/reproducing apparatus of the present invention.

FIG. 2 is an explanatory diagram showing the track configuration of an information recording medium and dirt on the tracks.

In Figure 1, 1 is an information recording medium, and this medium includes a second
There are tracks as shown in the figure. 2 is a laser light source section, 3 is a laser light detection section, 4 is an information detection notification section that performs error detection and notification of information to the drive controller section 5^, 5 is a drive controller 1-roller section, and 6 is a host I computer. It shows.

Normally, the laser light emitted from the laser light source section 2 is reflected by the medium 11 and is manually applied to the laser light detection section 3. At this time, the amount of light input to the laser light detection unit 3 changes depending on whether the laser light is reflected on a track on the medium 1, or when the laser light is off the track or when focus control is lost. This light intensity change is judged by the information detection notification section 4, and when the laser beam is off track or out of focus, the drive controller section 4
Notifies information of error occurrence. The drive controller section 5 further notifies the host computer 6 of information on the occurrence of an error.

Next, regarding the dirt detection procedure of "information recording medium" 2,
This will be explained using figures.

Now, as shown in FIG. 2, assume that dirt (here, foreign matter adhesion is referred to as dirt) 7 is attached to a part of the information recording medium 1, and the information on the track T is moved in the X direction. It is assumed that information is being recorded or played back. No error is detected until the laser beam reaches the right end point a of the dirt on the trunk Tj;.

However, between point a and point 6, the amount of reflected laser light emitted from the radar light source section 2 changes due to the dirt 7, and this change is detected by the laser light detection section 3 and an information detection notification is sent. The drive control unit 5 is notified through the unit 4.

It is possible to detect dirt on the information recording medium using this procedure, but as mentioned above, error signals can be generated even if the medium is not dirty, due to defects in the medium, when the laser beam goes off track, or when the laser beam goes off track. This can also occur due to device failure, such as loss of focus. Therefore, in the present invention, the drive controller unit 5 performs the following processing in order to distinguish between an error signal due to dirt, an error signal due to a medium defect, or an error signal due to a failure.

FIG. 3 is a flowchart of a process for detecting whether an error signal is caused by dirt on the medium, a defect in the medium, or a failure in the device.

FIG. 4 is an explanatory diagram showing an error table in the drive controller section.

As shown in FIG. 3, after detecting an error on the track T in step O(s,), the drive controller section 5 moves the head to the track t shown in FIG. 2 in step 1 (Sl). Track t is a track located quite far from track T where the error was detected (there is no dirt on this track). Step 2 (s
In step z), the drive controller unit 5 scans one track from track to track. Step 3 (Sa)
In step 14, the presence or absence of an error is determined as a result of scanning, and if an error has occurred, an unrecoverable error (for example, device failure) is notified to the host computer 6 in step 14 (SlJ), and the process is terminated. 4 (Sl)
Thereafter, a determination is made as to whether the medium is dirty or defective. In step 4 (Sl), a retry counter N in the drive controller unit 5, which specifies the number of times the same operation is repeated, is
The number of inspection tracks before and after the error-occurring track is set (11 in total, 5 tracks before and after the track T is the center in this embodiment shown in Fig. 2), and the number of inspection tracks shown in Fig. 4 is set. Clear the error table E that stores the number of tracks in which an error has been detected.

Steps 5 (Sl) to S (SS) are -track error determination, in which the head is moved to a designated trunk, the designated trunk is scanned, and the presence or absence of an error is determined. If an error is detected here, the error detection is stored in the error table. The above processing is performed for the number of tracks set in the retry counter N (step 9 (Sl)).

In the present embodiment shown in FIG. 2, the above processing is performed on 11 tracks from trunk T-5 to track T+5, but the number of tracks is not limited to this.

In step 10 (SIO), 1 of the error track T
The number of trunks FT in which errors have occurred continuously from the headquarters truck is counted. In step 11 (S11), the number BT of consecutive tracks in which errors have occurred is counted starting from the track one track after track T. In this embodiment shown in FIG. 2, the error table results are as shown in FIG. 4, and the table of E(31, E(4) is counted as FT and FT=2, and as BT, ,E(6
), the table of E(7) is counted and BT=2.

In step 12(s+z)t, the above FT and BT
From the total number of tracks, it is determined how many consecutively errors have occurred with trunk T as the border, and the number is determined to be at the level due to dirt (in this example, four or more consecutive errors occur before and after truck T). If the trunk exists, it is recognized as dirt attached.) If the trunk exists, it is determined that there is dirt, and the host computer 6 is notified and the process is terminated (step 13 (S
ls) ).

Step 15 (Sts) and subsequent steps are the processing when it is not determined that there is dirt, and in Step 15 (Sls), it is determined whether the trunk T is in error again using the error table E (5) shown in Fig. 4. If the medium is defective, it is recognized as a defective medium, a replacement process is performed, and the process ends (Step 1).
6 (Sl&)).

Step 17 (Sl7) is a case where no error occurs in the second scan of the track T, in which case it is determined that the error is recoverable, and recording and reproduction of information on the track T is attempted again.

〔Effect of the invention〕

As explained above, according to the information recording and reproducing apparatus of the present invention, it is possible to easily distinguish whether an error signal is caused by foreign matter adhering to the medium, a defect in the medium, or a device failure in a single process. Therefore, time consumption due to retry can be reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the information recording/reproducing apparatus of the present invention. FIG. 2 is an explanatory diagram showing the track configuration of the information recording medium and dirt on the trunk. FIG. 3 is a flowchart of a process for detecting whether an error signal is caused by dirt on the medium, a defect in the medium, or a failure in the device. FIG. 4 is an explanatory diagram showing an error table in the drive controller section. 1: Information recording medium, 2: Laser light source section, 3: Laser light detection section, 4: Information detection notification section, 5 Ni drive controller section, 6: Host computer, 7: Dirt on the medium.

Claims (1)

[Claims] When an error signal is detected during information recording and reproduction, means for scanning an area a predetermined distance away from the information recording medium position where the error signal was detected and determining that the information recording and reproduction apparatus is malfunctioning when the error signal is detected again; When an error signal is detected during information recording and reproduction, the area around the information recording medium position where the error signal was detected is continuously scanned, and the error signal is continuously detected beyond a predetermined area before and after the error detection position. When an error signal is detected during information recording/reproduction, a means for determining whether a foreign object has adhered to the medium is provided, and a means for continuously scanning the information recording medium in the vicinity of the position where the error signal was detected, and the position where the error signal was detected. an information recording/reproducing apparatus comprising means for determining that a medium is defective when an error signal is detected again in the information recording/reproducing apparatus.