JP3302835B2 - Control method of disk playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a commercial karaoke system using, for example, a CD (optical compact disc),
The present invention relates to a method for controlling a large-volume information management system using a CD-ROM or the like, or a method for controlling a large number of disc reproducing devices such as a jukebox using a CD or the like.

[0002]

2. Description of the Related Art As a pickup included in a drive device used in such a multi-disc reproducing apparatus, there is, for example, one shown in FIG. In FIG. 1, reference numeral 1 denotes a laser diode for emitting laser light. A light beam emitted from the laser diode 1 travels straight through a collimator lens 2, a diffraction grating 3, and a half prism 4, and is reflected by a right angle prism 5. Then, the laser beam is bent in a right angle direction and proceeds, and is focused on the data recording pit 7a of the CD 7 by being narrowed down by the objective lens 6.

After the reflected light from the data recording pit 7a passes through the objective lens 6 and the right-angle prism 5, it is reflected by the half prism 4, bends in the right-angle direction, travels, and is focused by the plano-convex lens 8. The light is focused on the detector 9 and the recorded data is read by the light detector 9.

When the pickup 10 of such a conventional drive device moves across each track of the CD 7, the change of the tracking error signal as shown in FIG. , The amount of movement of the pickup 10 can be detected.

Since the amplitude level of such a tracking error signal waveform is not constant due to the reflectance of the CD 7 or individual manufacturing errors, the amplitude level of the tracking error signal detected first is automatically adjusted. ,
As shown in FIG. 10, the amplitude level of the detection signal is constant (W)
I try to.

For example, like a detection signal shown in FIG.
When the amount of light received by the photodetector 9 is too large (the amplitude level W1
Is larger than the amplitude level W in FIG. 10) or FIG.
When the amount of received light is too small (the amplitude level W2 is smaller than the amplitude level W in FIG. 10) as in the detection signal shown in FIG.
In both cases, the amplitude level is adjusted by the automatic adjustment operation so that the amplitude level becomes a constant level (W) as shown in FIG.

[0007]

However, the objective lens 6 of the pickup 10 included in the conventional drive device is easily affected by dust, dust, cigarette dust, etc. If the dust or tobacco dust adheres, the amount of reflected light from the CD 7 (the amount of light received by the photodetector 9) is reduced.

In the automatic adjustment, the amount of light received by the photodetector 9 can be adjusted only within a certain range. If the amount of the reflected light is too small, the amplitude level becomes constant by the automatic adjustment. This makes it impossible to make the adjustment so that the amplitude level (W) becomes constant as shown in FIG.

In such a case, the change in the tracking error signal cannot be accurately counted, and the amount of movement of the pickup 10 cannot be detected. The operation cannot be performed.

[0010] In order to prevent such a situation, there is a device in which a warning of lens cleaning of the pickup 10 is displayed on the display unit when a predetermined light amount or less is detected within the light receiving amount range in which the automatic adjustment is possible. .

In this case, the objective lens 6 needs to be cleaned. However, conventionally, if the amount of the reflected light is reduced and the situation of detecting the predetermined amount of light or less occurs even once,
The warning of the lens cleaning of the pickup 10 is immediately displayed, and the objective lens 6 is cleaned.

As described above, conventionally, the objective lens 6 can be used without determining the cause of the decrease in the amount of received light other than the lens contamination, such as disk contamination or malfunction of the signal detection circuit. Is cleaned, the objective lens 6 is cleaned even when such dust or dirt attached to the objective lens 6 is not the cause. In that case, useless labor is wasted. At the same time, there is a problem in that the true cause cannot be determined and removed, and the result of repeating the same detection at a predetermined light amount or less is caused.

In the conventional multi-disc reproducing apparatus, when only one drive device is provided,
While the objective lens 6 of the pickup 10 is being cleaned, the entire apparatus must be stopped. In that case, there is a problem that the apparatus cannot be used and the usability is very poor for the user.

Therefore, the present invention can eliminate the useless lens cleaning effort to find and remove the real cause, prevent the usability from being deteriorated while cleaning the lens of one drive device, and detect the error. An object of the present invention is to provide a control method of a multi-disc reproducing apparatus with improved reliability.

[0015]

In order to solve the above-mentioned problems, a control method of a disk reproducing apparatus according to the present invention has the following features. In the present invention, a disc reproducing apparatus containing two or more discs is a multi-disc reproducing apparatus.

(1) In a method of controlling a disk reproducing apparatus having a plurality of drive devices which accommodate two or more disks and perform a reproducing operation when one disk is loaded by the disk conveying means, A disk is mounted on the first drive device, a light receiving unit of a pickup included in the first drive device receives an optical signal from the disk, and the light signal detection circuit receives the light signal from the light receiving unit. If the received light amount is determined to be equal to or less than a predetermined light amount, the disk is transported from the first drive device to the second drive device by the disk transport means, and is loaded. If the device also determines that the amount of received light is less than or equal to the predetermined amount of light, the device displays a warning to clean the disk and the second drive. When the disc is reproduced by the device and the received light amount is not determined to be equal to or less than the predetermined light amount in the second drive device, the count value for the first drive device stored in the storage unit in the device is set to 1 Update
If the count value exceeds a predetermined value, the device displays a warning to clean the lens of the pickup of the first drive device, and reproduces the disc by the second drive device, and If the value does not exceed a predetermined value, the disc is directly reproduced by the second drive device.

(2) In the control method of the multi-disc reproducing apparatus according to the means (1), the disc taken out of the multiplicity of stored discs is conveyed to the closest and empty one of the plurality of drive apparatuses. It is characterized by being attached.

(3) In the control method of the multi-disc reproducing apparatus according to the above means (1), the discs taken out of the multiplicity of discs to be stored are conveyed to a free drive device in a predetermined order and mounted. It is characterized by doing.

[0019]

[0020]

[0021]

[Action]

(1) According to the control method of the multi-disc reproducing apparatus of the means (1), when the amount of light received by the pickup of the drive device is equal to or less than a predetermined light amount due to the reflected light from the disk, the count stored in the storage unit is incremented by one. When the count exceeds a predetermined number, a warning is displayed to warn that the objective lens of the pickup has been cleaned, so that the detection reliability can be improved.

When the count is less than the predetermined number, the lens is cleaned when the cause is other than the lens contamination such as a disk contamination or a malfunction of a signal detection circuit, and wasteful labor is wasted. Can be prevented.

Further, by detecting and counting the light amount equal to or less than the predetermined light amount a plurality of times, if there is a cause other than the contamination of the lens in the meantime, it is possible to obtain an opportunity to investigate and remove the true cause. At the same time, it is possible to prevent the lens from being cleaned and the detection below the same predetermined light amount being repeated without being caused by dirt on the lens.

Further, since the multi-disc reproducing apparatus has a plurality of drive devices, the other drive device can be operated while the lens of the pickup of one drive device is being cleaned. It is possible to prevent the usability of the disc reproducing apparatus from being deteriorated due to the unavailability.

(2) According to the control method of the multi-disc reproducing apparatus of the means (2), together with the operation (1) described above,
Reduces the time from when the disc is removed to when it is played back, in order to transport the disc taken out of the large number of discs to be stored and transport it to the closest and empty drive among the plurality of drive units and mount it. can do.

(3) According to the control method of the multi-disc reproducing apparatus of the means (3), together with the above operation (1),
In order to transport the discs taken out of the large number of discs to be stored in accordance with a predetermined order and to install them in a vacant drive device, it is necessary to take into account that the contamination of the lens progresses according to the frequency of use. The device is more likely to detect a predetermined light intensity or less according to a predetermined order, and it is possible to prevent the pickups of a plurality of drive devices from receiving a warning about cleaning each lens at substantially the same time. By performing the cleaning, it is possible to prevent the entire apparatus from becoming unusable.

[0027]

Further, according to the control method of the multi-disc reproducing apparatus of the means (1), when the received light amount is less than a predetermined light amount, the disc is conveyed to another drive device and mounted, and When the received light amount is again lower than the predetermined light amount in another drive device, a warning is displayed to warn the disc to be cleaned, so it is determined whether the cause is lens dirt or another cause such as disc dirt. More likely to be possible.

[0029]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 are views for explaining an embodiment of a multi-disc reproducing apparatus according to the present invention. FIG. 1 is a diagram showing a multi-disc reproducing apparatus (music / video reproducing apparatus) as a commercial karaoke system equipped with a large number of CDs (discs).

In FIG. 1, reference numerals 12 and 13 denote disk trays each storing a large number of CDs (not shown). As shown in the figure, the disk trays 12 and 13 are vertically arranged in two stages. I have. Disc tray 12, 13
In the vicinity of each of the end portions, drive devices 16 and 17 which are paired with each of them are provided.

A disc autochanger 20 is provided on the other side of the disc trays 12 and 13 and the drive devices 16 and 17 in the drawing, and the disc autochanger 20 transfers a CD selected by a user to the disc disc tray 12 or 13. Go to get that C
It has a transport unit 20a that transports D and transports it to the disk drive device 16 or 17 for mounting.

The disc autochanger 20 is controlled by the control unit 22 shown in FIG. 3, and the transport unit 20a moves vertically along the guide member 20b as shown in FIG. By moving in the left-right direction in the figure while standing, it moves in the left-right direction in the figure together with the guide member 20b, so that a desired CD on the disc trays 12, 13 can be accessed. That is, the guide member 20b supports the transport portion 20a, and can be moved left and right in the figure by a driving device (not shown) while standing upright.

For example, a CD taken out of the disc tray 12 may be reproduced by the drive device 16 near the end of the disc tray 12, but other drive devices 17
Can also be reproduced. Other disc tray 13
The same applies to a CD taken out from a CD. And
In the first embodiment, in order to equalize the life of the drive devices 16 and 17, two drive devices 16 and 17 are used alternately in principle.

FIG. 3 is a diagram showing a circuit configuration of the multi-disc reproducing apparatus. As described above, the transport unit 20a is controlled by the control unit 22, and transports the CD between the disk trays 12, 13 and the drive devices 16, 17. The drive units 16 and 17 are provided with pickups 24 and 25, respectively, similar to the pickup 10 shown in FIG.

Each of the pickups 24 and 25 has a photodetector (light receiving section) similar to the photodetector 9 of the conventional pickup 10, and a tracking error signal (optical signal) based on the light received by the photodetector. ) Are connected to the photodetectors of the pickups 24 and 25, respectively.

When the user operates the external operation unit 32, the entire apparatus operates via the control unit 22. At this time, various operation modes and various instructions are displayed on the display unit 34, and the control unit 22 stores the information. Various control operations are performed by inputting and outputting various data to and from the unit 36.

Next, the operation of the first embodiment of the multi-disk reproducing apparatus will be described with reference to the flowchart of FIG. The user operates the external operation unit 32 to select a desired C
When D is selected and input by a symbol, the data is sent to the control unit 22, and the control unit 22 controls the transport unit 20.
The user a takes out the desired CD from the disk tray 12 or 13 and transports it to, for example, the drive device 16 to mount it (step S1). When this mounting is completed, the control unit 22
Issues a command to the drive device 16 to reproduce the recording data (music, video) of the desired CD (step S
2 YES).

In starting the reproduction of the CD, the pickup 24 of the drive unit 16 accesses the recording section of the desired music on the CD, but before that, the error signal detecting circuit 28
Detects the tracking error signal from the CD, and at this time, the error signal detection circuit 28 automatically adjusts the variation of the amplitude level of the tracking error signal to a constant level (W in FIG. 10) as described above.

The range of the amount of received light for which the amplitude level of the tracking error signal can be automatically adjusted is divided into several stages. If the amount of received light is too small and falls below the range, the drive unit 16 is turned off. Since the pickup cannot be operated, if the light amounts of the first and second stages are detected from the bottom where the light amount is the smallest in the above range (below a predetermined light amount), just before that (YES in step S3) ), The control unit 22 increases the count stored in the storage unit 36 by one (step S4).

At this time, the control unit 22 determines whether or not the storage count value of the storage unit 36 is 10 or less, and if it is 10 or less (YES in step S5), tries to detect the light amount of the tracking error signal again.

When the dirt on the lens further advances, the amount of received light further decreases, and as described above, the automatic adjustment of the amplitude level of the tracking error signal and the access operation of the pickup 24 cannot be performed. If the count value stored in (1) exceeds 10 (NO in step S5), a lens cleaning warning is displayed (step S6).

In the first embodiment, the count value is set to 1
The reason why the number of times is 0 is that the possibility of lens contamination increases if the detection is performed 10 times or less as described above.
This is because the possibility of a cause other than lens contamination is reduced. Therefore, the reliability of detection by the error signal detection circuit 28 can be improved, and wasteful lens cleaning due to causes other than lens contamination can be prevented.

After step S6, the lens of the drive unit 16 is cleaned. While the lens of the drive unit 16 is being cleaned, the reproduction is started by operating another drive unit 17. It is possible to prevent the entire device from becoming unusable and the usability of the device from deteriorating.

By the way, if the detection of the light quantity equal to or less than the predetermined light quantity is not performed in step S3 (NO), the drive device 16 is naturally made to perform the reproducing operation next (step S3).
7).

In the first embodiment, it has been described that the above-described detection of the light amount equal to or less than the predetermined amount is performed ten times by the error signal detection circuit. When the amount of received light decreases, the drive unit cannot control the pickup and cannot be used, so that the control unit 22 performs a control operation to perform a reproduction operation using another drive unit.

The counting of the ten detections of the light quantity equal to or less than the predetermined light amount may be performed even when the detection is continuously performed by repeating the signal detection operation again as in YES in the step S5, or one sheet may be counted. The reproduction may be started after counting several times on the same disc, and may be performed intermittently, such as when the reproduction is completed, and then counted again on another disc.
It may be less than the number of times.

After the lens cleaning warning is displayed in the first embodiment, the drive device 16 may be stopped, or the drive device 16 may be set to be in a reproducible state. Selection may be made according to the level of the light amount, or a desired one may be simply selected.

Further, in the first embodiment, the signal is detected again when the light amount becomes equal to or less than the predetermined light amount. However, a level for determining that the light amount is equal to or less than the predetermined light amount is set within a reproducible range. Even in the case where the light amount is less than the light amount, the reproduction can be performed for the time being. By doing so, it is possible to reduce the time required to try to detect the signal again.

FIG. 5 is a diagram showing a second embodiment of the control method for a multi-disk reproducing apparatus. First, the control unit 22 issues a disk transport instruction to the transport unit 20a, and the transport unit 20a goes to pick up a CD (step S1). When the transport unit 20a removes the CD, the control unit 22 determines which drive device is closest to the transport unit 20a and determines whether it is free (step S2).

If the closest drive is free (YES in step S2), a CD is mounted on the drive (step S3), and the CD is reproduced on the drive (step S4). If the closest drive device is not empty in step S2 (NO), a CD is mounted on the next closest drive device (step S5), and then the drive device reproduces the CD (step S4).

As described above, according to the second embodiment, a CD taken out of a large number of CDs stored in the disk trays 12 and 13 is conveyed to the closest one of the drive units 16 and 17 which is empty. In this case, the time from when the CD is taken out to when it is reproduced can be shortened.

Then, step S in the flowchart of FIG.
By inserting the flowchart of FIG. 4 between steps S3 and S5 and step S4, the effects of the first embodiment can also be obtained.

FIG. 6 is a diagram showing a third embodiment of the control method of the multi-disk reproducing apparatus. First, the control unit 22 issues a disk transport instruction to the transport unit 20a, and the transport unit 20a goes to pick up a CD (step S1). When the transport unit 20a removes the CD, for example, first, it is determined whether the drive device 16 is empty according to a predetermined order (step S).
2).

When the drive device 16 is empty (YES in step S2), a CD is mounted on the drive device 16 (step S3), and the drive device 16 reproduces the data (step S4). When the drive device 16 is not empty for reproduction in step S2 (NO)
Mounts a CD on the next-highest drive device 17 (step S5) and causes the drive device 17 to reproduce the CD (step S4).

As described above, according to the third embodiment, which drive device is to be first loaded with a CD taken out of a large number of CDs stored in the disk trays 12 and 13, and which one is next. In accordance with a predetermined order, the drive device is provided with a predetermined order in accordance with the predetermined order in order to transport and mount the drive device to an empty drive device, and in consideration that contamination of the lens proceeds according to frequency of use. The possibility that the light amount or less will be detected is increased, and it is possible to prevent a plurality of drive devices from receiving a lens cleaning warning substantially simultaneously, and performing the lens cleaning substantially simultaneously makes the entire device unusable. Can be prevented.

In the third embodiment, when a lens cleaning is performed in response to a lens cleaning warning of the first-ranked drive device, that drive device becomes the last-ranked drive device and the other drive devices become the last-ranked drive device. Is changed so that the order is moved up, the order stored in the storage unit 36 is changed, and the mounting order of the CD is determined based on the new order.

Then, by inserting the flowchart of FIG. 4 between steps S3 and S5 and step S4 of the flowchart of FIG. 6, the effect of the first embodiment can be obtained together.

FIG. 7 is a diagram showing a fourth embodiment of the control method of the multi-disk reproducing apparatus. Until step S5, the first
This is the same as the flowchart of FIG. 4 according to the embodiment. In the fourth embodiment, when the count value is equal to or less than 10 in step S5 (YES), the count value of the number of times of storage of the currently mounted CD stored in the storage unit 36 is increased by one. (Step S6).

If the count value at this time is the first time (YES in S7), the data is reproduced by the drive device 16 (step S8). If it is not the first time in step S7 (NO), a warning for cleaning the CD mounted at that time is displayed (step S10), and the drive device 16 reproduces the warning (step S8).

By the way, if the detection of the light quantity equal to or less than the predetermined light quantity is not performed in step S3 (NO), the drive device 16 is naturally reproduced next (step S8). Also,
The flow paths of steps S5, S9 and S8 are the same as the flow paths of steps S5, S6 and S7 in FIG.

As described above, according to the fourth embodiment, in addition to the effects of the first embodiment, when the received light amount is equal to or less than the predetermined light amount, the CD at this time is stored, and the CD related to the storage is stored.
When the light receiving amount is detected again below the predetermined light amount after re-attaching, the possibility of contamination of the CD increases, and a warning for cleaning the CD is displayed, and the CD is cleaned.
There is a high possibility that the cause below the predetermined light amount can be removed without cleaning the lens.

As for the timing for displaying the warning for cleaning the CD, the detection of the light amount equal to or less than the predetermined light amount for the same CD is 10 times.
At the second time during the count, at the second time regardless of the ten times, at the second time in a row, etc.
It can be set as needed. In addition, the setting may be set to the third time or more instead of the second time, in which case the possibility of contamination of the CD is further increased.

In the fourth embodiment, the reproduction is started (step S8) after the steps S9 and S10. However, the drive device 16 is stopped when the steps S9 and S10 are started. Is also good.

Further, in the fourth embodiment, even if the light amount equal to or less than the predetermined light amount is detected (step S3), the count is updated by one in the storage unit 36 (step S4), and the reproduction is started (step S8). However, as shown in the first embodiment,
After the storage unit 36 updates the count by one, the detection of the light amount of the tracking error signal may be attempted again. In this case, the process returns to the step S2 and the step S3 after the YES in the step S7,
In the case of No. 6, it is only necessary not to count when the same disk is continued.

FIG. 8 is a diagram showing a fifth embodiment of the control method for a multi-disk reproducing apparatus according to the present invention. Step S3
The steps up to this are the same as those in the flowchart of FIG. 4 according to the first embodiment. In the fifth embodiment, when the light amount equal to or less than the predetermined light amount is detected in step S3 (YES), the mounted CD is removed from the drive device 16 and transported to another drive device 17 for mounting. (Step S4).

If the other drive device 17 that has been conveyed also detects that the light amount is equal to or less than the predetermined light amount (YES in step S5), the possibility that the CD is dirty is high, and both drive devices 16 and 17 are used. The possibility of lens contamination is low.
For this reason, in this case, a warning for cleaning the CD is displayed on the display unit 34 (step S9), and the drive unit 17 reproduces the warning (step S8).

If the other drive unit 17 does not detect the light amount less than the predetermined light amount (N in step S5)
O) increases the count stored in the storage unit 36 by one with respect to the drive device 16 (step S6), and determines whether the count value of the drive device 16 is 10 or less (step S7). In the case (YES), the data is reproduced by the drive device 17 (step S8).

If the count value exceeds 10 in step S7 (NO), it is determined that the lens of the drive unit 16 is dirty first, and a warning for cleaning the lens of the pickup of the drive unit 16 is displayed (step S10). Playback is performed by the drive device 17 (step S8). If the answer is NO in step S3, the drive device 17
(Step S8).

As described above, in the fifth embodiment, when the received light amount is detected to be equal to or less than the predetermined light amount, the CD is transported to another drive device and mounted thereon. If the amount of light is detected to be less than the light amount, a warning for cleaning the disk is displayed. If the amount of received light is not detected to be less than the predetermined amount in another drive device, the count to be stored is updated by one for the first drive means, When the count exceeds a predetermined number, a warning is displayed to warn the objective lens of the pickup of the first drive means to be cleaned, so that it is possible to determine whether the cause is lens contamination or other causes such as CD contamination. The possibility of discrimination increases.

Therefore, compared to the first embodiment, the same 1
Even if the count is zero, the reliability is significantly improved.
A count value smaller than 10 may be used. By the way, also in the case of YES in step S5, the storage unit 36
May be increased by one, and when the count value becomes 2 or more, the process may proceed to step S9. This further increases the possibility of CD contamination.

In the fifth embodiment, the drive device 16
When the light amount equal to or less than the predetermined light amount is detected (step S3), the CD is immediately transported to the drive device 17 (step S3).
4) may be conveyed to the drive device 17 after being played back by the drive device 16 for the time being. In this case, since the reproduction of the target music is completed by the drive device 16,
Reproduction by the drive device 17 is a work of confirming dirt, and there is no need to allow the user to hear what is being reproduced by the drive device 17 through a speaker. Thus, at the same time as the above-described dirt check operation is performed by the drive device 17, the CD can be reproduced by the drive device 16 or another drive device if there are three or more drive devices, and the CD can be heard.

Also, as in the first embodiment, step S3
In the case where the light amount equal to or less than the predetermined light amount is detected, the light amount of the tracking error signal may be detected again after the count is updated by one in the storage unit 36. In that case, if the attempt at step S3 is performed ten times, a lens cleaning warning is displayed, and if less than ten times, playback is performed by the drive device 16 or a CD is immediately mounted on the drive device 17 (step S4). Then, if YES in step S5, the process proceeds to step S9, and if NO in step S5, the reproduction may be started (step S8) by omitting steps S6 and S7.

In the above embodiment, the description has been made by comparing CD contamination as a cause other than lens contamination. However, the present invention may be implemented by comparing other causes such as erroneous determination of an error signal detection circuit. It is needless to say that the present invention may be implemented by comparing all possible causes one after another.

Although the above embodiment has been described with respect to the case where there are two disk trays and two drive units, the number of disk trays and drive units may be three or more. No need to match.

[0075]

As described above, according to the present invention, when the amount of light received by the pickup of the drive device is equal to or less than a predetermined amount due to the reflected light from the disk, the count stored in the storage unit is updated by one, When the count exceeds a predetermined number, a warning is displayed to warn that the lens of the pickup has been cleaned, so that the detection reliability can be improved.

When the count is less than the predetermined number, the lens is cleaned when the cause is other than the lens contamination such as the disk contamination or the malfunction of the signal detection circuit, and wasteful labor is wasted. Can be prevented.

Further, by detecting the light amount equal to or less than the predetermined light amount a plurality of times, when there is a cause other than the contamination of the lens in the meantime, it is possible to obtain an opportunity to investigate and remove the true cause. It is possible to prevent the lens from being cleaned and the detection below the same predetermined amount of light being repeated without being caused by dirt.

Further, since the multi-disc reproducing apparatus has a plurality of drive units, the other drive units can be operated while the lens of the pickup of one drive unit is being cleaned. It is possible to prevent the usability of the disc reproducing apparatus from being deteriorated due to the unavailability.

According to the second embodiment, in addition to the above-described effects, a disk taken out of a large number of disks to be stored is conveyed to the closest and empty one of the plurality of drive devices. In order to mount the disc, the time from when the disc is removed to when the disc is played can be reduced.

Further, according to the third embodiment, in addition to the above effects, the discs taken out of the large number of discs to be stored are conveyed to the empty drive device according to a predetermined order and mounted. In consideration of the fact that dirt on the lens progresses according to the frequency of use, the drive device is more likely to detect a predetermined amount of light or less according to a predetermined order. It is possible to prevent a warning of cleaning from being received, and it is possible to prevent the entire apparatus from becoming unusable by performing each lens cleaning at substantially the same time.

According to the fourth embodiment, in addition to the above effects, when the received light amount is equal to or less than the predetermined light amount, the count stored in the storage unit is updated by one each time the same disk is mounted. When the number exceeds a predetermined number, a warning is displayed to warn the user to clean the disk. In this case, the possibility of dirt on the disk is high. The likelihood increases.

Further, according to the fifth embodiment, in addition to the above effects, when the received light amount is detected to be equal to or less than a predetermined light amount, the disk is transported to another drive device and mounted, and the received light amount is If the detected amount of light is equal to or less than the predetermined light amount, a warning is displayed to warn that the disk is to be cleaned. When the count exceeds a predetermined number of times, a warning is displayed to warn the lens of the pickup included in the first drive means. It is more likely that it is possible to determine whether the cause is another cause.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a multi-disc reproducing apparatus according to a first embodiment of a method for controlling a multi-disc reproducing apparatus according to the present invention.

FIG. 2 is an internal rear view conceptually showing the operation of the disc autochanger 20 of the multi-disc reproducing apparatus shown in FIG.

FIG. 3 is a diagram showing a circuit configuration of the multi-disc reproducing apparatus shown in FIG. 1;

FIG. 4 is a flowchart showing a first embodiment of a control method for a multi-disc reproducing apparatus according to the present invention.

FIG. 5 is a flowchart showing a second embodiment of the control method of the multi-disk reproducing apparatus according to the present invention.

FIG. 6 is a flowchart showing a third embodiment of the control method of the multi-disk reproducing apparatus according to the present invention.

FIG. 7 is a flowchart showing a fourth embodiment of the control method for a multi-disc reproducing apparatus according to the present invention.

FIG. 8 is a flowchart showing a fifth embodiment of the control method for a multi-disc reproducing apparatus according to the present invention.

FIG. 9 is an exploded perspective view of a main part showing a pickup of the drive device.

FIG. 10 is a standard waveform diagram of a tracking error signal when crossing each track of CD7.

FIG. 11 is a waveform diagram of a tracking error signal when crossing each track when the amount of received light is too large.

FIG. 12 is a waveform diagram of a tracking error signal when crossing each track when the amount of received light is too small.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laser diode 2 Collimator lens 3 Diffraction grating 4 Half prism 5 Right angle prism 6 Objective lens 7 CD 7a Data recording pit 8 Plano-convex lens 9 Photodetector 10 Pickup 12, 13 Disk tray 16, 17 Drive device 20 Disk autochanger 20a Transporter 20b Guide member 22 control unit 24, 25 pickup 28, 29 error signal detection circuit 32 external operation unit 34 display unit 36 storage unit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-242348 (JP, A) JP-A-5-54513 (JP, A) JP-A-3-113724 (JP, A) JP-A-3- 78179 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 19/00-19/02 G11B 7/12

Claims (1)

(57) [Claims] 1. A method for controlling a disk reproducing apparatus having a plurality of drive devices which accommodates two or more disks and performs a reproducing operation when one disk is mounted by a disk conveying means, the method comprising: One disk is mounted on the first drive device, a light receiving unit of a pickup included in the first drive device receives an optical signal from the disk, and a light signal detection circuit detects an amount of received light by receiving light from the light receiving unit. When the received light amount is determined to be equal to or less than a predetermined light amount, the disk is transported from the first drive device to the second drive device by the disk transport means, and is loaded. If the received light amount is determined to be equal to or less than the predetermined light amount, the apparatus displays a warning to clean the disk and the second drive unit If the disk drive does not determine whether the received light amount is equal to or less than a predetermined light amount in the second drive device, the count value for the first drive device stored in the storage unit in the device is incremented by one. Updating, when the count value exceeds a predetermined value, the apparatus displays a warning to clean the lens of the pickup of the first drive device and reproduces the disc by the second drive device; If the count value does not exceed a predetermined value, the disc is reproduced by the second drive device as it is, and a control method of the disc reproducing device.