JP3771731B2 - Disc type recording / playback device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disc-type recording / reproducing apparatus that records and reproduces images and the like using a disc that can be recorded and reproduced.
[0002]
[Prior art]
In recent years, disk-type recording / reproducing apparatuses for recording and reproducing video signals using a writable disk instead of a tape used as a video recording medium have started to appear on the market. As a disk used in such a disk type recording / reproducing apparatus, in addition to a hard disk, an optical disk such as an MO (magneto-optical disk) or a DVD (digital video disk) can be cited.
[0003]
In general, the first characteristic of the disk is high-speed accessibility. That is, the disk does not need to be rewound like a tape, and has a feature that any area can be quickly accessed by simply moving the head on the disk. This feature of the disc is a great advantage in terms of searchability.
[0004]
Another feature of the disk is that the disk medium is much more resistant to repeated recording than the tape medium. In tape media used in video tape recorders, the number of repeated recordings that can be repeatedly recorded on video tape is several tens to several hundreds at most, whereas in disk media, several hundreds of thousands to several times. One million times of repetitive recording is possible. The reason for this is that the recording head and the disk are not in contact with each other, and that the disk for digital recording has high error correction capability, so that deterioration can be suppressed.
[0005]
As described above, since the disc has a feature of being resistant to repeated recording, the disc type recording / reproducing apparatus has begun to be used as a time lapse device. Time-lapse devices are used for security at banks, post offices, convenience stores, etc., for monitoring trends in people and vehicles at stations and intersections, and for academic research. Is the security field.
[0006]
A disc-type recording / reproducing device used as a time-lapse device in the security field is usually used in a manner that performs endless repetitive recording on a disc while intermittently recording video as in the tape type. The repetitive recording here means recording many times from the beginning to the end of the disc. When recording from the beginning to the end (in other words, the entire surface of the disc), it means one repetitive recording.
[0007]
By the way, in general, a disk cannot be used unless it is first formatted (initialized). Data on the disk is initialized by formatting. Therefore, it is possible to initialize the disc by performing formatting even during use, and return it to a state where nothing is recorded like a new one.
[0008]
[Problems to be solved by the invention]
However, the conventional disk type recording / reproducing apparatus has the following problems. For example, in a time lapse apparatus using a conventional disk type recording / reproducing apparatus, a disk is repeatedly recorded over a long period of time. And as described above, the disc is more resistant to repeated recording than the tape, and the image quality is not gradually deteriorated like the analog recording tape for digital recording. Can be used without
[0009]
In this way, the disc can be used without being replaced for a long period of time, but in digital recording, when the limit of the number of repeated recordings of the disc is exceeded, a phenomenon occurs in which errors increase rapidly and suddenly it becomes impossible to record To do. However, in the case of a disc, there is a problem that it is difficult to judge the replacement time of a medium in view of the degree of image quality deterioration like a tape, and it is difficult to judge when the disc becomes unusable.
[0010]
An object of the present invention is to provide a disc-type recording / reproducing apparatus that manages the number of times of recording so that a user can surely know that the disc is approaching deterioration.
[0011]
Another object of the present invention is to provide a disc-type recording / reproducing apparatus which prevents the newly recorded information from being read out due to the deterioration of the disc.
[0012]
Still another object of the present invention is to provide a disc type recording / reproducing apparatus capable of confirming the number of recordings up to the time of formatting.
[0013]
Still another object of the present invention is to provide finer recording depending on whether the disc is used as a rewritable disc that can be repeatedly recorded or as a pseudo write-once disc that can be recorded only once in a pseudo manner. It is an object of the present invention to provide a disk type recording / reproducing apparatus capable of managing the number of times.
[0014]
[Means and Actions for Solving the Problems]
In order to achieve the object, the invention according to claim 1
In a disc-type recording / reproducing apparatus using a recordable / reproducible disc,
Formatting means for initializing the disk, recording number recording means for recording the number of repeated recordings of the disk, display means for displaying the number of repeated recordings and errors, and the number of recordings set in advance during the repeated recording of the disk When the first predetermined number N is exceeded, an error is displayed by the display means, and when the used disk is initialized by the formatting means, the number of times recorded on the disk is preset. When the second predetermined number M (M is an integer of M ≦ N) or less, the recording number information recorded on the disc is left uninitialized, and exceeds the second predetermined number M. In some cases, control means for displaying an error by the display means is provided.
[0015]
In other words, the invention according to claim 1 records the number of times the disk is repeatedly recorded on the disk, manages how many times the disk has been repeatedly recorded, and displays an error display when the number of times the recording exceeds the first predetermined number N. Do. Further, since data is erased when the disc is initialized, the number of times of recording is not erased even at that time, and the number of times of recording exceeds a predetermined second predetermined number M at the time of initialization. An error message is displayed on the disc. As a result, not only during normal recording, but also when formatting is performed, it is possible to reliably manage the number of repeated recordings, accurately determine the deterioration status of the disc, and inform the user. Become.
[0016]
According to a second aspect of the present invention, in the disc-type recording / reproducing apparatus according to the first aspect, the control means performs recording prohibition or format prohibition simultaneously with the error display.
[0017]
In the invention according to claim 2, when the number of times of recording of the disc exceeds the first predetermined number N, or when the number of times of recording exceeds a predetermined second predetermined number M at the time of initialization of the disc, an error is displayed. In addition, the disc is prohibited from recording or formatting. As a result, the user knows that the deterioration of the disk is approaching, and prevents newly recorded information from being read out.
[0018]
Furthermore, the invention according to claim 3 is the disc-type recording / reproducing apparatus according to claim 1 or 2, wherein when the disc is initialized, the number of recordings already recorded on the disc is separated as a history. It is characterized in that it is recorded in the area.
[0019]
In the invention according to claim 3, it is possible to confirm the number of times of recording up to the time of formatting based on the number of times of recording recorded in another area as a history.
[0020]
Furthermore, the invention according to claim 4 is the disc-type recording / reproducing apparatus according to any one of claims 1 to 3, wherein the disc is a rewritable disc mode used as a rewritable disc capable of repeatedly recording the disc, or the disc is simulated. A disk mode selection means for selecting a pseudo write-once disk mode to be used as a pseudo write-once disk that can be recorded only once, and a disk mode recording means for recording the disk mode on the disk at the time of formatting. Whether to leave the recording count information or display an error when initializing a used disc is determined by the second predetermined number M for the rewritable disc mode, and the pseudo write one disc mode is set. For the third place to replace the second predetermined number of times M Number M1 (M1 is an integer of M ≦ M1 ≦ N), characterized in that it has to be determined by.
[0021]
In the invention according to claim 4, it is possible to set whether to use the disc as a rewritable disc that can be repeatedly recorded or as a pseudo write-once disc that can be recorded only once in a pseudo manner. In the pseudo write-one disc mode, the rewritable disc can be set. A third predetermined number of times M1 is substituted for the second predetermined number of times M set for the disk mode. As a result, even in a disc-type recording / reproducing apparatus having two disc modes, it is possible to manage the number of times of recording with a rewritable disc and a pseudo write-once disc.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a disc-type recording / reproducing apparatus according to the present invention will be described below with reference to the drawings.
[0023]
Embodiment 1 FIG.
FIG. 1 shows the configuration of an embodiment of a disk type recording / reproducing apparatus according to the present invention. The disk-type recording / reproducing apparatus includes an optical disk 10 which is a removable disk, a servo circuit 11 for controlling the rotation of the optical disk 10 and the head 12, a head 12 for writing information to and reading information from the optical disk 10, and a signal processing unit including a formatting means 13a. A circuit 13, a memory 14, a microcomputer 15 as control means, a display 16 for displaying information such as the number of repeated recordings and errors, and an input device 17 such as a key for performing a format execution instruction and disc mode selection.
[0024]
When the optical disk 10 is used for the first time, the optical disk 10 is formatted using a signal processing circuit 13 including formatting means 13a. When this formatting process is performed, the optical disk 10 can be used thereafter. After this formatting process, the number of recordings is recorded as 0 on the optical disc 10.
[0025]
When the optical disc 10 is repeatedly recorded, the signal processing circuit 13 adds 1 to the number of times recorded on the optical disc 10 every time recording is performed, and newly adds the previously recorded number of times. Update to the correct recording count. For example, when the optical disk 10 is recorded from the beginning to the end, 1 is added to the previous recording count. In this way, each time the entire surface of the optical disk 10 is recorded once, recording is performed by adding 1 to the previous recording count.
[0026]
The microcomputer 15 has the first predetermined number N. The first predetermined number N is set as the number of times that the recording may not be normally performed in the subsequent repeated recording due to the deterioration of the disk when the recording is repeated further on the optical disk 10. Assuming that the first predetermined number N is 10,000, if the number of times of recording exceeds 10,000 during repeated recording, the microcomputer 15 displays an error display indicating disk deterioration of the optical disk 10. To the display 16. Although recording can be continued after the error is displayed, the microcomputer 15 can prohibit the recording operation.
[0027]
On the other hand, when the optical disc 10 in use is initialized and the recorded data up to that point is erased or the optical disc 10 is used as a new one, the microcomputer 15 checks whether the optical disc 10 has been used. This is done by writing data such as an ID on the disk and reading it from the signal processing circuit 13.
[0028]
A second predetermined number M is set in the microcomputer 15. If the optical disk 10 has been used at the time of initialization, the microcomputer 15 determines the recording number of the optical disk 10 and the second predetermined number. The number of times M is compared.
[0029]
In general, when an optical disc is initialized, it becomes as good as a new one. Normally, the user cannot determine whether the optical disc has been used or not. For this reason, in the case of a used optical disc, it is preferable to display that the number of repeated recordings is small. However, for example, it is not convenient when compared with the first predetermined number N. For example, a disc that has been repeatedly recorded 9999 times has a smaller number of repeated recordings than the first predetermined number N. Therefore, if formatting is performed without giving an error display, the disc can actually be recorded only once after initialization. become. For example, when M is set to 9000 times smaller than N and compared with this, when trying to initialize a disc that exceeds 9000 times, an error is first displayed to indicate that the remaining number of recordings is small, and the user is displayed. Note that it is better to repeat the recording after initialization, and to further display an error when the recording count exceeds 10,000. Therefore, the second predetermined number M is set to an integer equal to or smaller than the first predetermined number N as described above.
[0030]
When the number of times of recording on the used optical disk 10 is greater than the second predetermined number of times M, the microcomputer 15 displays on the display 16 that the remaining number of times of recording is small. It is also possible to prohibit the formatting process at that time. When the number is less than the second predetermined number M, the format process is performed according to the following procedure. The microcomputer 15 reads the recording count data from the optical disc 10 through the signal processing circuit 13 and writes it in the memory 14. Thereafter, the optical disc 10 is initialized using the formatting means 13a of the signal processing circuit 13. As a result, the data on the optical disk 10 is initialized, but the optical disk 10 is in a new state. Thereafter, the microcomputer 15 reads the number of recordings from the memory 14 and writes the number of recordings back to the optical disk 10 through the signal processing circuit 13. At this time, if the number of times of recording at the time of formatting is stored as a history in another area of the optical disc 10, it is convenient because it is possible to know how many times it has been recorded before formatting.
[0031]
FIG. 2 shows a flowchart of processing executed by the microcomputer 15. The microcomputer 15 confirms whether the format is instructed by the input device 17 (step S1). When the format is executed (Y side in step S1), it is determined whether or not the optical disc 10 is a recorded disc (step S2). If it is not a recorded disc (N side in step S2), the disc is a new one, and formatting is executed by the formatting means 13a of the signal processing circuit 13 (step S3). Record (step S4).
[0032]
When formatting is not performed (N side of step S1), it is checked whether recording is in progress (step S5). When recording is in progress (Y side of step S5), it is checked whether repeated recording has been performed on the optical disc 10. (Step S6). When the repetitive recording is performed (Y side in step S6), an increment process for increasing the number of recordings recorded on the optical disc 10 by 1 is performed (step S7). At that time, if the number of times of recording is smaller than the first predetermined number N times that the microcomputer 15 has, nothing is done (Y side of step S8), but if it becomes N or more, an error is displayed on the display 16 ( Step S9).
[0033]
Since the recorded optical disk 10 is a used disk, the formatting process is performed on the recorded disk when formatting is performed thereafter (Y side in step S2). At the time of formatting, first, the number of times of recording is compared with a second predetermined number M, and when it is equal to or greater than M (N side in step S10), an error is displayed on the display 16 (step S11). When it is smaller than M (Y side in step S10), first, the number of recordings is read out and saved in the memory 14 through the signal processing circuit 13 (step S12). Subsequently, the disk is formatted by the formatting means of the signal processing circuit 13 (step S13). After formatting, the number of times of recording in the memory 14 is written to the optical disc 10 (step S14).
[0034]
Embodiment 2. FIG.
Next, Embodiment 2 in which a disc that can be repeatedly recorded is used as a rewritable disc that can be repeatedly recorded as it is or a pseudo write-once disc that can be recorded only once in a pseudo manner is selected. Will be described.
[0035]
Making a recordable disc recordable only once in a pseudo manner has various uses in terms of data retention. However, even in this case, the entire data can be erased by the formatting process.
[0036]
In the present embodiment, in the disc type recording / reproducing apparatus having the configuration shown in FIG. 1, the input unit 17 can select a disc mode of rewritable disc or write-once disc at the time of formatting. The selected disc mode data is recorded on the optical disc 10 by the signal processing circuit 13.
[0037]
Also in the present embodiment, when the optical disc 10 is used as a rewritable disc, the number of recordings on the optical disc 10 is compared with a second predetermined number M as in the first embodiment. However, when the optical disk 10 is used as a pseudo write-once disk, it is only necessary to be able to record once after formatting, so it is desirable to have a third predetermined number value M1 that is a number larger than the second predetermined number M. . In this case, the third predetermined number of times M1 is M ≦ M1 ≦ N. The third predetermined number M1 is further set in the microcomputer 15.
[0038]
A processing flowchart of the microcomputer 15 in the second embodiment is shown in FIG. Since this process flowchart is the same as the process flowchart of FIG. 2 described in the first embodiment, except for steps S15 and S16, the steps S15 and S16 and related processes will be described. . When formatting the recorded optical disk 10 in step S2, it is determined whether or not it is a rewritable disk (step S15). If the disc is a rewritable disc (Y side in step S15), the same processing as in FIG. 2 is performed. On the other hand, in the case of a pseudo write-once disk (N side of step S15), the number of recordings is compared with a third predetermined number M1 (M ≦ M1 ≦ N) (step S16), and the number of recordings is a third predetermined number M1. In the above case (N side of step S16), the microcomputer 15 displays an error on the display 16 (step S11). If the recording count is smaller than the third predetermined count M1 (Y side in step S16), the formatting process is performed in the same manner as in FIG.
[0039]
In the disc type recording / reproducing apparatus of the present embodiment, the first to third predetermined times N, M, and M1 are built in the microcomputer 15, but the user may input from the input unit 17. Good. Further, the recording count recorded on the optical disc 10 may be called to the display 16 at any time in accordance with an instruction from the input device 17.
[0040]
【The invention's effect】
As described above, according to the present invention, the number of repeated recordings can be reliably managed not only during normal recording but also when formatting is performed, and the deterioration state of the disc can be accurately communicated to the user. As a result, the user can reliably know when to replace the disk and prevent troubles due to disk deterioration.
[0041]
In addition, according to the present invention, by performing recording prohibition and format prohibition at the same time as displaying an error, it is possible to eliminate the occurrence of trouble such that the data to be written cannot be read due to disk deterioration. .
[0042]
Further, when the formatting unit executes initialization of the disc, the number of recordings up to the time of formatting can be confirmed by recording the number of recordings already recorded on the disc as a history in another area. .
[0043]
Furthermore, a rewritable disc and a pseudo write-once disc can also be set in a disc-type recording / reproducing apparatus capable of setting whether to use the disc as a rewritable disc capable of repetitive recording or as a pseudo write-once disc that can be recorded only once in a pseudo manner. Thus, an advantageous effect that the number of times of recording can be managed more finely is obtained.
[Brief description of the drawings]
FIG. 1 is a block diagram showing the configuration of an embodiment of a disk type recording / reproducing apparatus according to the present invention.
FIG. 2 is a processing flow of the microcomputer according to the first embodiment of the present invention.
FIG. 3 is a processing flow of the microcomputer according to the second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Optical disk 11 Servo circuit 12 Head 13 Signal processing circuit 13a including formatting means Formatting means 14 Memory 15 Microcomputer 16 Display 17 Input device

Claims (4)

In a disc-type recording / reproducing apparatus using a recordable / reproducible disc,
Formatting means for initializing the disk, recording number recording means for recording the number of repeated recordings of the disk, display means for displaying the number of repeated recordings and errors, and the number of recordings set in advance during the repeated recording of the disk When the first predetermined number N is exceeded, an error is displayed by the display means, and when the used disk is initialized by the formatting means, the number of times recorded on the disk is preset. When the second predetermined number M (M is an integer of M ≦ N) or less, the recording number information recorded on the disc is left uninitialized, and exceeds the second predetermined number M. A disc-type recording / reproducing apparatus characterized by comprising control means for displaying an error by the display means. 2. The disc type recording / reproducing apparatus according to claim 1, wherein the control unit simultaneously prohibits recording or formatting when the error display is performed. 3. The disk type recording according to claim 1, wherein when the initialization of the disk is executed, the number of times of recording already recorded on the disk is recorded as a history in another area. Playback device. Disc mode selection means for selecting between a rewritable disc mode used as a rewritable disc that enables repeated recording of a disc, and a pseudo write one disc mode used as a pseudo write-once disc that can record a disc only once in a pseudo manner, and a format A disc mode recording means for recording the disc mode on the disc at the time of the recording, whether to leave the recording count information or to display an error when initializing a used disc, for the rewritable disc mode. Is determined by the second predetermined number M, and for the pseudo write one disk mode, a third predetermined number M1 (M1 is an integer of M ≦ M1 ≦ N) instead of the second predetermined number M. Any one of claims 1 to 3, characterized in that the determination is made. Disc type recording and reproducing apparatus according to one or.

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