JP2003281815A - Optical disk reproducing device, program and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the various problems (the noise of a spindle motor and others) arising from a sudden increase or stop of the rotating speed of the spindle motor in an optical disk reproducing device. <P>SOLUTION: The optical disk reproducing device which performs reproduction processing of an optical disk at a speed meeting the rotating seed of the optical disk and outputs reproduced data to the outside after temporarily storing the reproduced data into a memory section is supposed. The amount of change in the residual quantity (accumulation quantity) of the reproduced data stored in the memory section is detected and the rotating speed of the optical disk is controlled according to the detected amount of the change. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc reproducing apparatus for reproducing data recorded on an optical disc.

[0002]

2. Description of the Related Art CD-ROM (Compact Disc-Read Onl
Various devices (hereinafter, referred to as an optical disc reproducing device) for reproducing data recorded on an optical disc such as a y memory) and a CD-R (Compact Disc-Recordable) are provided.

FIG. 4 shows a schematic structure of a conventional optical disk reproducing apparatus 90. When the user inserts the optical disc 91 into the optical disc reproducing device 90 to reproduce the data, the optical disc reproducing device 90 drives the spindle motor 92 to rotate the optical disc 91 at a predetermined speed.
The optical pickup 93 irradiates the optical disc 91 with laser light. At this time, the signal reflected from the optical disk 91 is output to the reproduction processing circuit 94, and the reproduction processing circuit 94
Performs predetermined signal processing on the supplied reflected light signal to generate reproduction data. The reproduced data is temporarily stored in the buffer 95 and then output to an external device such as a personal computer.

Here, in the conventional optical disc reproducing apparatus 90, first, the spindle motor 92 is rotated at a high speed,
Data reproduction processing is performed at high speed, and reproduction data is sequentially stored in the buffer 95. When a certain amount of data is stored in the buffer 95, the rotation of the spindle motor 92 is stopped or the rotation is switched to a low speed, and the signal processing for reproducing the data is interrupted (standby state). After that, when the data continues to be output from the buffer 95 to the personal computer or the like, and the remaining amount of data in the buffer 95 becomes small, the optical disk reproducing device 90 again transits to a state in which the spindle motor 92 is rotated at high speed to perform the data reproducing process. It was controlled to do so.

[0005]

In the conventional method as described above, there is an advantage that it is not necessary to constantly rotate the spindle motor 92 at a high speed to perform the data reproducing process, but there are the following problems. That is, according to the conventional method, the amount of data accumulated in the buffer 95 is monitored, and when the amount of accumulated data exceeds a certain level, the rotation speed of the spindle motor 92 is reduced (or stopped), and when the amount of accumulated data falls below a certain amount. Since the simple control of increasing the rotation speed of the spindle motor 92 is performed, noise may be generated from the spindle motor 92 or the spindle motor 9 may be increased as a result of abruptly increasing the rotation speed of the spindle motor 92.
There was a problem that the calorific value of 2 increased. Further, during the period in which the rotation speed of the spindle motor 92 is increased (so-called spin-up period), the data cannot be read from the optical disc, so that the efficiency of the data reading process may decrease. Further, the conventional method merely determines whether or not the amount of data stored in the buffer 95 is equal to or more than a certain amount and controls the rotation of the spindle motor 92. For example, a request from an external device (such as a personal computer) is required. It was not possible to respond promptly when the transfer rate of the data transferred changed with time. As a result, the reproduction data may not be output to an external device (such as a personal computer) in some cases.

The present invention has been made in consideration of the above matters, and various problems caused by suddenly increasing or stopping the rotation speed of the spindle motor in the optical disk reproducing apparatus (of the spindle motor) The purpose is to solve noise).

[0007]

In order to solve the above-mentioned problems, an optical disk reproducing apparatus according to the present invention performs a reproduction process of the optical disk by irradiating a rotationally driven optical disk with a laser beam and reproducing the reproduced data to the outside. An optical disc reproducing apparatus for outputting, wherein a rotation driving unit that rotationally drives the optical disc at a rotation speed according to a supplied control signal, and a reproduction process of the optical disc at a speed according to the rotation speed of the optical disc, A reproduction processing unit that sequentially generates reproduction data, a storage unit that temporarily stores the reproduction data that is generated by the reproduction processing unit, and a reproduction unit that stores the reproduction data that is stored in the storage unit. And a control unit that detects a change amount of the remaining amount per unit time and supplies the control signal to the rotation drive unit according to the change amount. That.

According to the configuration of the optical disk reproducing apparatus, the optical disk is rotationally driven at the rotation speed according to the supplied control signal, and the optical disk reproduction process is performed at the speed corresponding to the rotation speed of the optical disk. become. Then, the generated reproduction data is temporarily stored in the storage unit until it is output to the outside. Further, the amount of change in the remaining amount (accumulation amount) of the reproduction data stored in the storage unit is detected, and a control signal for driving the optical disc to rotate at a rotation speed according to the detection result is generated. . In this way, the rotation speed of the optical disc is precisely controlled according to the amount of change in the remaining amount (accumulation amount) of the reproduction data stored in the storage unit per unit time. It is unlikely that various problems (noise, heat generation, etc.) will occur due to sudden changes in speed.

Here, the control unit determines whether the change amount of the remaining amount is positive and whether the remaining amount is larger than a predetermined threshold value, and based on each determination result. The control signal may be supplied to the rotation drive unit. Also, the control unit rotates the control signal for decreasing the rotation speed of the optical disc by a predetermined amount when the amount of change in the remaining amount is positive and the remaining amount is larger than a predetermined threshold value. It may be characterized in that it is supplied to the drive unit.

More specifically, the control unit increases the rotation speed of the optical disk by a predetermined amount when the change amount of the remaining amount is negative and the remaining amount is smaller than a predetermined threshold value. The control signal may be supplied to the rotation driving unit. Further, the control unit determines whether or not the amount of change in the remaining amount is positive, determines whether or not a change in the amount of change in the remaining amount (hereinafter, referred to as change rate) is positive, and determines the remaining amount in advance. It may be characterized in that it is determined whether or not it is larger than a predetermined threshold value, and the control signal is supplied to the rotation drive unit based on each determination result.

Further, the program according to the present invention is a program for controlling an optical disk reproducing apparatus for reproducing the optical disk by irradiating a rotationally driven optical disk with a laser beam and outputting reproduction data to the outside. The computer, the rotation driving means for driving the optical disc to rotate at a rotation speed according to the supplied control signal, the reproduction process of the optical disc at a speed corresponding to the rotation speed of the optical disc, and the reproduction data is sequentially generated. Reproduction processing means, storage means for temporarily storing the reproduction data generated by the reproduction processing part until it is output to the outside, and the remaining amount of the reproduction data stored in the storage part per unit time. To detect the amount of change and to function as a control unit that supplies the control signal to the rotation drive unit in accordance with the amount of change Characterized in that it is a program.

When the optical disk reproducing apparatus is controlled by using such a program, the optical disk reproducing apparatus drives the optical disk to rotate at a rotational speed according to the supplied control signal, and at the speed corresponding to the rotational speed of the optical disk. Playback processing of the optical disk is performed. Then, the generated reproduction data is temporarily stored in the storage unit until it is output to the outside. Further, the amount of change in the remaining amount (accumulation amount) of the reproduction data stored in the storage unit is detected, and a control signal for driving the optical disc to rotate at a rotation speed according to the detection result is generated. .
In this way, the rotation speed of the optical disc is precisely controlled according to the amount of change in the remaining amount (accumulation amount) of the reproduction data stored in the storage unit per unit time. It is unlikely that various problems (noise, heat generation, etc.) will occur due to sudden changes in speed.

If the above-mentioned program is recorded in a computer-readable recording medium, it is possible to facilitate transactions and the like.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

A. Configuration FIG. 1 is a block diagram of a main part of an optical disc reproducing apparatus 100 according to an embodiment of the present invention. As shown in FIG. 1, the optical disc reproducing apparatus 100 includes an optical pickup 1
0, a spindle motor 11, a reproduction processing circuit 12, a servo circuit 13, a buffer memory 15, and a control unit 16. The optical disc reproducing apparatus 100 includes a host PC (Pers
The optical disc reproducing apparatus 100 outputs reproduction data to the host PC 200 in response to a request from the host PC 200.

The spindle motor 11 is a motor for driving the optical disc D to rotate. Optical pickup 10
Is a unit that integrally includes a laser diode, an optical system such as a lens and a mirror, and a light receiving element for returning light. When reproducing the data recorded on the optical disc D,
The optical pickup 10 irradiates the optical disc D with a laser beam and receives the return light from the optical disc D. Then, the EFM (Eight to Fourteen Modula) which is a light reception signal
tion) The modulated RF signal is output to the reproduction processing circuit 12. Further, the optical pickup 10 has a monitor diode, and when a current flows through the monitor diode by the return light of the optical disc D, a signal corresponding to this current amount is supplied to the servo circuit 13.

The reproduction processing circuit 12 includes an optical pickup 10.
The EFM-modulated RF signal supplied from the amplifier is amplified and output to the servo circuit 13. The reproduction processing circuit 12 also generates reproduction data by performing EFM demodulation processing on the RF signal and outputs the reproduction data to the buffer memory 15. Here, since the reproduction processing circuit 12 performs signal processing based on the EFM-modulated RF signal supplied from the optical pickup 10, the amount of reproduction data generated in the reproduction processing circuit 12 per unit time is the spindle motor. It is proportional to the rotation speed of 11. Therefore, the amount of reproduction data supplied from the reproduction processing circuit 12 to the buffer memory 15 per unit time is also determined by the spindle motor 1.
It is proportional to the rotation speed of 1.

The servo circuit 13 performs focus control, tracking control, output level control of laser light, and the like in the optical pickup 10. For example, the optical pickup 10 is controlled so that the optical pickup 10 outputs laser light having a constant power based on a signal indicating the amount of current flowing through the monitor diode of the optical pickup 10.
Further, the servo circuit 13 supplies a drive signal for rotating the optical disc D at a predetermined speed to the spindle motor 11 based on a predetermined control signal supplied from the control unit 16.

The control unit 16 includes a CPU (Central Processi).
ng Unit) 31, ROM (Read Only Memory) and RA
Memory 3 composed of M (Random Access Memory) etc.
Has 0. The control unit 16 controls each unit of the optical disc reproducing apparatus 100 according to a predetermined control program stored in advance in the memory 30, controls the focus servo mechanism and the tracking servo mechanism, controls the recording power value, and controls the drive of the spindle motor 11. And so on.

The buffer memory 15 temporarily stores the reproduction data supplied from the reproduction processing circuit 12 under the control of the control unit 16. FIG. 2 is a diagram schematically showing the contents of the buffer memory 15. As shown in FIG. 2, the buffer memory 15 is provided with a data area for storing a predetermined unit reproduction data for each address. here,
The unit reproduction data is, for example, 1 frame data, 10
It refers to a predetermined reproduction data group such as frame data. In the present embodiment, the control unit 16
Under the control of, reproduction data is output from the reproduction processing circuit 12 to the buffer memory 15 for each unit reproduction data, and stored (written) in the buffer memory 15 for each unit data.
To be done. In addition, the buffer memory 1 for each unit reproduction data
Data is output (read) from the buffer memory 5, and is output from the buffer memory 15 to the host PC 200.

Further, as schematically shown in FIG.
The unit reproduction data supplied from the reproduction processing circuit 12 are stored in the order of addresses in the buffer memory 15. Figure 2
(A) shows a case where the unit reproduction data DT001 is stored in the recording area of the address A001 and the unit reproduction data DT002, ... Is stored in the recording area of the address A002. On the other hand, in response to a reproduction data request from the host PC 200, under control of the control unit 16, the buffer memory 15
The reproduction unit data is sequentially read from the host PC 20.
It is output to 0. As schematically shown in FIG. 2B, the unit reproduction data is sequentially read out in the order of addresses of the buffer memory 15. After the unit reproduction data is read, the data area of the address is in an empty state, and then the unit waits for the unit reproduction data to be stored.

The buffer memory 15 also includes a control unit 16
It has a pointer function controlled by. Figure 2
As shown in (c), the buffer memory 15 shows the write pointer P1 indicating the address of the recording area where the unit reproduction data should be stored next, and the address of the recording area where the unit reproduction data should be read next. It has a read pointer P2. Here, the difference value between the position of the read pointer P2 and the address where the write pointer P2 is located represents the amount of data currently stored in the buffer memory 15. That is, it is the unit reproduction data generated by the reproduction processing circuit 12, and it is still the host PC2.
00 represents the amount of unit reproduction data that has not been output.

The buffer memory 15 is a ring buffer, and after writing (or reading) the unit data up to the data area of the final address, the data area of the start address becomes the target of writing (or reading). .

B. Operation First, the operation outline of the optical disc reproducing apparatus 100 will be described. When the user sets the optical disk D in the optical disk reproducing apparatus 100 and operates the host PC 200 to instruct the start of data reproduction, the control unit 16 causes the apparatus 10 to operate.
By controlling each unit of 0, the reproduction process for the optical disc D is executed in the same manner as the conventional optical disc reproducing apparatus. Specifically, the control unit 16 drives the spindle motor 11 to rotate the optical disc D at a predetermined initial speed (V0). Then, the optical pickup 10 for the optical disc D
Is irradiated with a predetermined laser beam.

Then, the reflected light when the optical disk D is irradiated with the laser light is detected by the optical pickup 10 and output to the reproduction processing circuit 12. Reproduction processing circuit 12
Performs signal processing such as EFM demodulation processing on the EFM-modulated RF signal supplied from the optical pickup 10 to generate unit reproduction data. Here, the reproduction processing circuit 12 sequentially generates unit reproduction data at the timing when the RF signal is supplied from the optical pickup 10, and outputs the unit reproduction data to the buffer memory 15. That is, the amount of reproduction data generated by the reproduction processing circuit 12 per unit time is proportional to the reproduction speed of the optical disc D, in other words, the rotation speed of the spindle motor 11.

Therefore, the unit reproduction data is sequentially supplied from the reproduction processing circuit 12 to the buffer memory 15 at a speed proportional to the rotation speed of the spindle motor 11. Control unit 1
6 sequentially stores (writes) unit reproduction data in the buffer memory 15 based on the write pointer P1 of the buffer memory 15. On the other hand, the control unit 16 reads the unit reproduction data from the buffer memory 15 based on the read pointer P2 of the buffer memory 15, and
Output to the host PC 200. Here, the interval at which the unit reproduction data is read from the buffer memory 15 depends on the host PC.
According to the data transfer rate required from 200. The above is the outline of the operation of the optical disc reproducing apparatus 100. Next, the control content relating to the rotation control of the spindle motor 11 of the control unit 16, which characterizes the present invention, will be described in detail.

The control unit 16 drives the spindle motor 11 to rotate, etc., and starts the reproduction of data, and then executes the control shown in the flow chart of FIG. 3 every predetermined time (for example, 100 msec). This will be described below with reference to FIG. The control unit 16 first determines the data storage amount A of the buffer memory 15.
Is detected (step Sa2). Although the data storage amount A can be detected arbitrarily, for example, the difference value between the positions of the read pointer P2 and the write pointer P1 of the buffer memory 15 can be calculated to detect the value corresponding to the data storage amount A. it can.

Then, the control unit 16 makes two determinations regarding the detected data storage amount A. As the first determination, the control unit 16 determines the magnitude relationship between the data storage amount A detected this time and the data storage amount B detected last time (step Sa3). What is the value of the data storage amount B detected last time?
The data storage amount detected when the flow shown in FIG. 3 is executed last time, and this information is stored in a predetermined area of the memory 30. As the second determination, the control unit 16 determines whether or not the data storage amount A detected this time is larger than a predetermined threshold amount Z (step Sa5, step Sa8). Here, the threshold amount Z is determined in advance as a value that allows the data storage amount itself to have a margin. More specifically, the optical disc reproducing apparatus 100 is caused by some cause.
Even if the playback process related to
A value that can output data to C200 without any problem. The threshold amount Z according to the present embodiment is set to a value corresponding to the amount of 50% data accumulated in the recordable area of the buffer memory 15.

The control unit 16 controls the rotation of the spindle motor 11 on the basis of the above two determination results, and the specific control contents will be described below in different cases.

(1) When the detected data storage amount A is larger than the previous data storage amount B (step Sa
4: YES), when the data storage amount A is larger than the threshold amount Z (step Sa5: YES), the control unit 16 performs control to reduce the rotation speed of the spindle motor 11 (step Sa6). That is, when the data storage amount A is larger than the previous data storage amount B, it means that the data amount stored in the buffer memory 15 tends to increase. further,
When the data storage amount A is larger than the threshold amount Z, the data storage amount A is equal to or more than a certain value (50 of the recording capacity of the buffer memory 15).
% Or more), which means that the data storage amount itself has a margin. From the above, the control unit 16 determines that the current data reproduction processing speed is too fast, and controls the rotation speed of the spindle motor 11 to be reduced by a predetermined amount to reduce the data reproduction processing speed. Here, the predetermined amount (change amount) for reducing the rotation speed is a predetermined constant amount, and even if the rotation speed is changed, there is no problem such as noise from the spindle motor 11 accompanying it. A quantity in a range.

(2) Even when the detected data storage amount A is larger than the previous data storage amount B (step Sa
4: YES), when the data storage amount A is smaller than the threshold amount Z (step Sa5: YES), the control unit 16 performs control to maintain the rotation speed of the spindle motor 11 as it is (step Sa7). As described above, the data storage amount A
Is larger than the previous data storage amount B, it means that the data amount stored in the buffer memory 15 tends to increase. However, when the data storage amount A is smaller than the threshold amount Z, it means that the data storage amount A is below a certain level (50% or less of the capacity of the buffer memory 15), and there is no margin in the data storage amount itself. From the above, the control unit 16 determines to maintain the current data reproduction processing speed in order to increase the storage amount of the buffer memory 15 as it is to allow the data storage amount itself to have a margin. That is, the control unit 16 maintains the current rotation speed of the spindle motor 11 as it is and controls the data reproduction processing speed.

(3) When the detected data storage amount A is smaller than the previous data storage amount B (step Sa
4: NO), if the data storage amount A is smaller than the threshold amount Z (step Sa8: NO), control is performed to increase the rotation speed of the spindle motor 11 (step Sa10). That is, when the data storage amount A is smaller than the previous data storage amount B, it means that the data amount stored in the buffer memory 15 tends to decrease. When the data storage amount A is smaller than the threshold amount Z, the data storage amount A is equal to or less than a certain value (in the present embodiment, 5 in the buffer memory 15).
0% or less), which means that there is no margin in the data storage amount itself. From the above, the control unit 16 determines that the current data reproduction processing speed is not sufficient, and increases the rotation speed of the spindle motor 11 to control the data reproduction processing speed. Here, the predetermined amount (change amount) for increasing the rotation speed is a predetermined constant amount, and even if the rotation speed is changed, there is no problem such that noise is generated from the spindle motor 11 with it. A quantity in a range.

(4) Even when the detected data storage amount A is larger than the previous data storage amount B (step Sa
4: NO), if the data storage amount A is larger than the threshold amount Z (step Sa8: YES), the control unit 16 performs control to maintain the rotation speed of the spindle motor 11 as it is (step Sa9). As described above, when the data storage amount A is smaller than the previous data storage amount B, it means that the data amount stored in the buffer memory 15 tends to decrease. However, when the data storage amount A is larger than the threshold amount Z, it means that the data storage amount A is a certain amount or more (50% or more of the buffer memory 15 in this embodiment), and the data storage amount itself has a margin. To do. From the above, the control unit 16 determines that it is not necessary to increase the current data reproduction processing speed, and the spindle motor 11
The rotation speed of is controlled so as to maintain the current state.

The above is the contents of control relating to the spindle motor 11 performed by the control unit 16. After that, the control unit 16 sets the data storage amount A detected this time to the memory 3
The predetermined area of 0 is overwritten (stored) as the “previously detected data storage amount B” (FIG. 3: step Sa11), and this flow is ended (step Sa12).

As described above, according to the optical disc reproducing apparatus 100 of the present invention, the control unit 16 detects and detects the data storage amount A of the buffer memory 15 at every predetermined time when reproducing the data. Based on the value of the data storage amount A, the rotation control of the spindle motor 11 is performed to control the data reproduction speed. Here, the control unit 16 does not simply control the rotation of the spindle motor 11 according to the data storage amount of the buffer memory 15 as in the conventional optical disc reproducing apparatus, but the data storage amount of the buffer memory 15 and The rotation control of the spindle motor 11 is precisely performed in consideration of the degree of change in the data storage amount per unit time. As described above, the optical disc reproducing apparatus 100 according to the present invention, like the conventional apparatus, suddenly decreases (or stops) the rotation speed of the spindle motor 11 when the data storage amount increases, and the data storage amount decreases. Since it is not necessary to perform extreme control such as suddenly increasing the rotation speed of the spindle motor 11, suddenly increasing the rotation speed of the spindle motor 11 causes noise and increases the amount of heat generated by the spindle motor 11. There is no problem. Further, since the optical disc reproducing apparatus 100 according to the present invention controls the rotation of the spindle motor 11 based on the change amount of the data storage amount, for example,
Even in a situation where the transfer rate of data requested from the host PC 200 changes, it is possible to respond promptly, and precise control is always performed so that data of a threshold amount Z or more is accumulated in the buffer memory 15. You can

In the description of the above embodiments, it is assumed that the data recorded on the optical disc D is reproduced in order, the reproduced data is temporarily stored in the buffer memory 15, and then output to the host PC 200. . However, in reality, the requested data content may suddenly change depending on the user's instruction. For example, there is a case where the host PC 200 requests the data recorded on the outermost circumference of the optical disc D while the data reproduction process is being performed from the innermost circumference position of the optical disc D. In such a case, the data accumulated in the buffer memory 15 up to that point cannot be used as the data to be output to the host PC 200, and in fact, the buffer memory 15 cannot be used.
In this situation, the amount of data stored inside will run out.

In such a case, in the conventional control method,
Extreme control is performed such that the rotation speed of the spindle motor 11 is continuously increased until the amount of data stored in the buffer memory 15 reaches or exceeds a predetermined amount, and then the rotation speed of the spindle motor 11 is stopped (or decreased). Was being done. Therefore, there has been a problem that noise is generated from the spindle motor 11.

On the other hand, according to the control method according to the present embodiment (see FIG. 3 above), if the amount of data accumulated in the buffer memory 15 increases (step Sa4: YE in FIG. 3).
S) Even if the data storage amount is equal to or less than the predetermined amount Z (step Sa5: NO), the spindle motor 11
The extreme control for increasing the rotation speed of is not performed (step Sa7). That is, if the amount of data stored in the buffer memory 15 tends to increase, even if the amount of data storage is currently less than or equal to the predetermined amount Z, the amount of data storage in the buffer memory 15 thereafter becomes greater than or equal to the predetermined amount Z. Therefore, the control unit 16 determines that the spindle motor 11
The current rotation speed is maintained. Therefore, according to the control method according to the present embodiment, extreme control such as continuously increasing the rotation speed of the spindle motor 11 is not performed,
Various problems such as noise and heat generation amount in the spindle motor 11 which have conventionally been problems do not occur.

C. Modifications The above-described embodiment is merely one embodiment of the present invention, and any modification can be added within the scope of the spirit of the present invention. Some of them are shown below.

(Modification 1) The rotation control of the spindle motor 11 can be modified arbitrarily. In the above-described embodiment, the rotation speed control of the spindle motor 11 is performed according to the flow shown in FIG. 3 above. However, the determination standard is further subdivided, and the rotation speed control of the spindle motor 11 is performed precisely. Good. For example, control is performed such that the amount of change in the rotation speed of the spindle motor 11 is changed depending on whether the difference value between the currently detected data accumulation amount A and the previously detected data accumulation amount B is greater than or equal to a predetermined amount. You may

The storage amount Z1 corresponding to 70% of the storage capacity of the buffer memory 15 and the storage amount Z2 corresponding to 50% of the data, 30% data When the accumulated amount Z3 has been accumulated, the accumulated amount Z3 is obtained in advance, and the rotation amount of the spindle motor 11 is controlled more precisely according to the result of comparing the detected amount of accumulated data A with the accumulated amounts Z1, Z2 and Z3. You may do it. Then, the detected data accumulation amount A
Is less than Z1 (30% or more) and Z1 or more
The control may be performed so as to change the amount of change in the rotation speed of the spindle motor 11 between the case of 2 or less (30% to 50%).

(Modification 2) In the optical disk reproducing apparatus 100 according to the above embodiment, the control unit 16 detects the data storage amount A in the buffer memory 15, and
The magnitude relationship with the previously detected data storage amount B was judged, and the rotation control of the spindle motor 11 was performed. The contents of this judgment can be arbitrarily modified. For example, not only the previously detected data storage amount B, but also the previously detected data storage amount C, the previously detected data storage amount D, ... Spindle motor 1
The rotation control of 1 may be performed. By performing such control, it is possible to calculate the change in the amount of change in the data storage amount, that is, the rate of change in the data storage amount. The rotation rate of the spindle motor 11 may be controlled using this rate of change. For example, "when the amount of data storage is decreasing at a constant rate (when the rate of change is zero)" and "when the amount of data storage is decreasing at an accelerated rate (when the rate of change is not zero)". Alternatively, the control contents for the spindle motor 11 may be different based on each case. Here, in the case of “when the data storage amount is acceleratingly decreasing” and “when the data storage amount is smaller than the threshold amount Z”, control is performed to increase the rotation speed of the spindle motor 11, "When the data storage amount is increasing at an accelerated rate",
In addition, in the case of “when the data storage amount is larger than the threshold amount Z”, a method of controlling so that the rotation speed of the spindle motor 11 is lowered may be adopted. Alternatively, the amount of change in the rotation speed of the spindle motor 11 may be controlled to be different depending on the amount of change in the amount of accumulated data.

(Modification 3) Alternatively, by comparing the average value of the data storage amount per predetermined time (for example, the average value of 10 samples up to the previous time) with the data storage amount A detected this time, the spindle motor The rotation control of 11 may be performed. By performing such control, when there is a sudden change in the data storage amount for some reason, the control can be performed by ignoring the situation.

(Modification 4) A recording medium for recording the program according to the present invention is arbitrary. CD-ROM (Compact
Disc- Read Only Memory) and CD-R (Compact Disc-R)
Of course, it may be an optical disk such as an ecordable), but it is a recording medium other than that. MO (Magneto Optica
It may be a magneto-optical disk such as a Disk, an MD (Mini Disc), a floppy (registered trademark) disk, a magnetic disk such as a hard disk, or the like. The method of installing such a program is also arbitrary, and the optical disc reproducing apparatus 100 may be installed by using the above-described recording medium. It is also possible to adopt a method of using so-called net distribution, in which the optical disc reproducing apparatus 100 is installed on the optical disc reproducing apparatus 100.

[0045]

As described above, according to the present invention,
It is possible to solve various problems (noise of the spindle motor, etc.) that occur when the rotation speed of the spindle motor in the optical disk reproducing device is suddenly increased or stopped.

[Brief description of drawings]

FIG. 1 is a block diagram of a configuration of an optical disc reproducing apparatus 100 according to an embodiment of the present invention.

FIG. 2 is a schematic diagram for explaining the contents of a data buffer 15 of the optical disc reproducing apparatus 100.

FIG. 3 is a flowchart showing control contents of a control unit 16 of the optical disc reproducing apparatus 100.

FIG. 4 is a diagram for explaining a conventional technique.

[Explanation of symbols]

100 ... Optical disc reproducing device, 10 ... Optical pickup, 11 ... Spindle motor, 12 ... Reproduction processing circuit, 13 ... Servo circuit, 15 ... Buffer memory, 1
6 ... control unit, 30 ... memory, 31 ... CPU (Cent
ral Processing Unit), 200 ... Host PC, D ...
… Optical disc, 90 …… Optical disc playback device, 91 ……
Optical disk, 92 ... Spindle motor, 93 ... Optical pickup, 94 ... Reproduction processing circuit, 95 ... Buffer.

Claims (9)

[Claims] 1. A reproducing process of the optical disc is performed by irradiating a rotationally driven optical disc with laser light.
An optical disk reproducing apparatus for outputting reproduction data to an external device, comprising: a rotation driving unit that rotationally drives the optical disk at a rotation speed according to a supplied control signal; and a rotation driving unit for rotating the optical disk at a speed according to the rotation speed of the optical disk. A reproduction processing unit that performs reproduction processing and sequentially generates reproduction data, a storage unit that temporarily stores the reproduction data generated by the reproduction processing unit, and a storage unit that stores the reproduction data. An optical disc reproducing apparatus, comprising: a control unit that detects a change amount of the remaining amount of the reproduction data per unit time and that supplies the control signal to the rotation driving unit according to the change amount. 2. The optical disc reproducing apparatus according to claim 1, wherein the control unit determines whether or not the amount of change in the remaining amount is positive, and whether or not the remaining amount is larger than a predetermined threshold value. An optical disc reproducing apparatus, which makes a determination and supplies the control signal to the rotation drive unit based on each determination result. 3. The optical disk reproducing apparatus according to claim 2, wherein the control section of the optical disk is such that the change amount of the remaining amount is positive and the remaining amount is larger than a predetermined threshold value. An optical disc reproducing apparatus, characterized in that the control signal for reducing a rotation speed by a predetermined amount is supplied to the rotation drive section. 4. The optical disc reproducing apparatus according to claim 2, wherein the control unit of the optical disc is such that the amount of change in the remaining amount is negative and the remaining amount is smaller than a predetermined threshold value. An optical disk reproducing apparatus, which supplies the control signal for increasing a rotation speed by a predetermined amount to the rotation drive section. 5. The optical disc reproducing apparatus according to claim 1, wherein the control unit determines whether or not the amount of change in the remaining amount is positive, and changes in the amount of change in the remaining amount (hereinafter, referred to as change rate). Is determined to be positive and whether the remaining amount is larger than a predetermined threshold value, and the control signal is supplied to the rotation drive unit based on each determination result. A characteristic optical disk reproducing apparatus. 6. The optical disc reproducing apparatus according to claim 5, wherein the control unit has a positive change amount of the remaining amount, a positive change rate of the remaining amount, and the remaining amount from a predetermined threshold value. An optical disk reproducing apparatus, which supplies the control signal for lowering a rotation speed of the optical disk to a predetermined amount when the rotation speed is large. 7. The optical disk reproducing apparatus according to claim 5, wherein the control unit has a negative amount of change in the remaining amount, a negative change rate of the remaining amount, and the remaining amount is greater than a predetermined threshold value. An optical disk reproducing apparatus, which supplies the control signal for lowering a rotation speed of the optical disk to a predetermined amount when the rotation speed is small, to the rotation drive section. 8. A reproducing process of the optical disk is performed by irradiating the rotationally driven optical disk with a laser beam,
A program for controlling an optical disk reproducing apparatus for outputting reproduction data to the outside, comprising: a rotation driving unit that drives a computer to rotate the optical disk at a rotation speed according to a supplied control signal; Reproduction processing means for performing reproduction processing of the optical disc at a speed corresponding to the reproduction data and sequentially generating reproduction data; storage means for temporarily storing the reproduction data generated by the reproduction processing unit until it is output to the outside; A program for detecting a change amount of the remaining amount of the reproduction data stored in the storage unit per unit time, and causing the rotation drive unit to function as a control unit that supplies the control signal according to the change amount. 9. A computer-readable recording medium in which the program according to claim 8 is recorded.