JP3892634B2 - Disk drive device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disk drive device that reads information on a recording medium such as a CD-ROM disk.
[0002]
[Prior art]
A disk drive device handling an optical disk such as a CD-ROM drive device or a DVD-ROM drive device has a significantly improved reading speed. Generally, a high reading speed is achieved by rotating the disk at high speed with a spindle motor so that the optical pickup can read data at high speed.
[0003]
In general, the recording track of the disk is slightly shifted in the normal direction or the radial direction of the disk surface, and the drive device finely moves the optical pickup in accordance with the track change in order to follow the changing track. This technique is known as tracking servo or focus servo.
[0004]
[Problems to be solved by the invention]
However, in recent years, the so-called bad disk, which has a larger track transition than the conventional ones, is overflowing in the market, and the higher speed of the disk drive device requires higher speed control technology for the optical pickup than before. ing.
[0005]
On the other hand, since the control capability of the optical pickup has almost reached its limit, there is no method for reading the information on the bad disk other than reducing the reading speed.
[0006]
Conventionally, a technique has been used in which the fact that reading of information on a disk has failed is used to read the disk while decelerating the rotation of the disk, and acceleration is performed again on the condition that reading does not fail.
[0007]
However, in the conventional method, it is impossible to determine whether the failure in reading is due to the change of the track or the deterioration of the signal quality due to scratches or dirt on the disk. For this reason, for example, in the case of signal quality deterioration, there is a possibility that the reading ability is further lowered by reducing the rotation speed. Further, if only the disk read error signal is referred to as a condition for re-acceleration of the decelerated disk rotation speed, there is a problem that a read error occurs again as a result of the re-acceleration.
[0008]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a disk drive device that can simultaneously achieve a higher quality read result and information reading as fast as possible.
[0009]
[Means for Solving the Problems]
  In one embodiment of the present invention, an optical pickup for reading a signal from an optical disc, a circuit for generating a focus error signal, a tracking error signal, and reproduction data from the output of the optical pickup, and a spindle motor for rotating the optical disc In a disk drive device having a spindle control device capable of controlling the rotation speed, the spindle control device uses at least one of the data error signal or focus error signal of the reproduction data as a determination element for decelerating and changing the rotation speed. The data error signal and the focus error signal of the reproduction data are used as determination elements for changing the rotation speed at an accelerated speed.
[0010]
As described above, by using the focus error signal and the tracking error signal as a change factor of the disk rotation speed, multifaceted situation determination can be performed.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0012]
FIG. 1 shows an embodiment of the present invention. The optical disk (for example, CD-ROM) 11 is rotated when the spindle motor 12 rotates. The optical pickup 13 irradiates the information recording surface of the optical disc 11 with a laser beam, receives the reflected light, and obtains a photoelectric conversion output. The converted output is guided to the signal processing unit 14. The signal processing unit 14 generates a read signal from the photoelectric conversion signal. The signal processing unit 14 generates a focus error signal (FE), a tracking error signal (TE), and a data error signal from the photoelectric conversion signal.
[0013]
The focus error signal and tracking error signal are guided to the pickup servo circuit 15. The pickup servo circuit 15 gives a focus actuator signal and a tracking actuator signal to the focus coil and tracking coil of the optical pick 13 based on the focus error signal and the tracking error signal. As a result, the objective lens (not shown) of the optical pickup 13 is focus-controlled and tracking-controlled with respect to the signal recording surface of the optical disk 11.
[0014]
The focus error signal and the tracking error signal are supplied to the spindle controller 16 which is a characteristic part of the present invention. A data error signal is also input to the spindle controller 16. Furthermore, a focus actuator signal and a tracking actuator signal may be input from the pickup servo circuit 15 to the spindle controller 16. The spindle controller 16 also receives a rotation detection pulse of the motor 12. The spindle control unit 16 can control the rotation speed of the spindle motor 12 based on the input information.
[0015]
As for the control state of the entire apparatus, the system control unit 20 controls the entire operation state, reproduction, stop, and the like. An operation input from an operation unit (including a remote controller) is also taken in through the system control unit 20.
[0016]
When there is a request for data from the host computer 18, this apparatus recognizes the command. A command from the host computer 18 is input via the communication control unit 17 and recognized by, for example, the system control unit 20. If the content of this command requires data, this disk drive device can read the data on the optical disk 11 and transmit it to the host computer 18 via the signal processing unit 14 and the communication control unit 17.
[0017]
  2 and 3The drawing shows the extraction path of the focus error signal and focus actuator signal and the extraction path of the tracking error signal and tracking actuator signal.
[0018]
A circuit for acquiring a focus error signal is mainly composed of an equalizer, a power driver, and an optical pickup driving system. The equalizer receives as input the amount of shift in the normal direction, which means how much the optical pickup is located with respect to the surface of the disc. Then, a second-order differentiated signal (focus actuator signal) is sent to the power driver.
[0019]
The power driver amplifies the signal in a direction that cancels out the shift amount in the normal direction, and sends the amplified signal to the optical pickup drive system. These form a closed loop as a whole. The focus error signal is an input signal from the optical pickup driving system to the equalizer.
[0020]
The circuit for acquiring the tracking error signal is mainly composed of an equalizer, a power driver, and an optical pickup driving system. The equalizer receives as an input a radial shift amount that indicates how much the optical pickup refers to a position shifted from the target track on the disk. Then, a second-order differentiated signal (tracking actuator signal) is sent to the power driver.
[0021]
The power driver amplifies the signal in a direction that cancels out the shift amount in the radial direction, and sends it to the optical pickup drive system. These form a closed loop as a whole. The tracking error signal is an input signal from the optical pickup driving system to the equalizer.
[0022]
FIG. 4 shows a configuration example of the spindle controller 16.
[0023]
The spindle control unit 16 receives a focus error signal, a tracking error signal, and a data error signal. The focus error signal is converted into a format that can be used by the focus error signal analyzer 31 and input to the focus error analysis result 332. On the other hand, the tracking error signal is converted into a format that can be used by the tracking error signal analyzer 33 and input to the tracking error analysis result 34.
[0024]
Similarly, the data error information is stored as disk quality information 36 in view of the data error by the disk quality determination device 35.
[0025]
The acceleration / deceleration determination device 37 determines whether the disk should be accelerated or decelerated based on the focus error analysis result, tracking error analysis result, and disk quality information, and controls the spindle motor based on the result. Output as a spindle control signal to be performed.
[0026]
FIG. 5 is a flowchart showing an example of the operation of the focus error signal analyzer 31. The focus error signal analysis device 31 is always operating while the disc is rotated after the disc is loaded into the playback device, and continues to create the latest focus error analysis result at that time.
[0027]
The focus error signal analyzer first clears the counter A. Thereafter, in order to obtain the maximum value and the minimum value of the focus error (FE) signal, first, two variables, the FE maximum value and the FE minimum value, are initialized (steps A1 to A3).
[0028]
Subsequently, the counter B is cleared, and the total value SB is also cleared. Subsequently, an FE signal is acquired. The value of the FE signal is added to SB until the counter B reaches a specified value (steps A4 to A9).
[0029]
When the counter B reaches the specified value, the total value SB is compared with the maximum value and the minimum value of the FE signal so far, and the maximum value of FE and the minimum value of FE are updated (steps A10 to A13).
[0030]
In the present invention, the focus error signal acquisition time interval is determined by the time during which the focus error signal analyzer 31 executes the innermost loop of FIG. 5, but the focus error signal is acquired at a longer time interval. If desired, this can be easily realized by inserting a delay device in the innermost loop as appropriate.
[0031]
Subsequently, the counter A is incremented. When the value of the counter A reaches the specified value, the difference (EF amplitude) between the FE maximum value and the FE minimum value is stored as a focus error analysis result (steps A14 to A17). At this time, the focus error signal is processed into a total value (an average value divided by the number of data), and an effect of removing spike noise potentially possessed by each focus error signal can be obtained.
[0032]
FIG. 6 is a flowchart showing an example of the operation of the tracking error signal analyzer 33. The tracking error signal analysis device 33 is always operating while the disc is rotated after the disc is loaded into the playback device, and continues to create the latest tracking error analysis result at that time.
[0033]
The tracking error signal analyzer first clears the counter C. Thereafter, in order to obtain the maximum value and the minimum value of the tracking error (TE) signal, first, two variables, the TE maximum value and the TE minimum value, are initialized (steps B1 to B3).
[0034]
Subsequently, the counter D is cleared, and the total value SB is also cleared. Subsequently, a TE signal is acquired. The value of this TE signal is added to SB until the counter D reaches a specified value (steps B4 to B9).
[0035]
When the counter D reaches the specified value, the total value SB is compared with the maximum value and the TE minimum value of the TE signal so far, and the TE maximum value and the TE minimum value are updated (steps B10 to B13).
[0036]
In the present invention, the tracking error signal acquisition time interval is determined by the time for which the tracking error signal analyzer 31 executes the innermost loop of FIG. 6, but the tracking error signal is acquired at a longer time interval. If desired, this can be easily realized by inserting a delay device in the innermost loop as appropriate.
[0037]
Subsequently, the counter C is incremented. When the value of the counter C reaches the specified value, the difference (TE amplitude) between the TE maximum value and the TE minimum value is stored as a tracking error analysis result (steps B14 to B17). At this time, the tracking error signal is processed into a total value (an average value when divided by the number of data), and an effect of removing spike noise potentially possessed by each tracking error signal can be obtained.
[0038]
  The disk quality judgment device 35 is notified of a data errorFromIt is judged whether the disc quality seen is high or low quality. As this determination criterion, for example, a reference value may be stored in a memory according to various disks. This reference value is compared with the error information to determine the quality.
[0039]
FIG. 7 is a flowchart for explaining the operation of the acceleration / deceleration determination device 37.
[0040]
The device 37 does not always operate, but is operated every time a read command is issued from the host computer and every time an event such as a read failure occurs.
[0041]
When the execution is started, it is first determined whether or not the disc quality viewed from the data error is low quality. If it is determined that the quality is low, low-speed rotation is instructed, and the counter E, which means a delay until the disk rotation speed is increased again, is reset (steps C1 to C4).
[0042]
On the other hand, if it is determined that the disc is of high quality, the counter E is incremented, and the high-speed rotation instruction is not issued until it reaches a specified numerical value (jump to the end as it is) (steps C5 and C6). . When the counter E reaches the specified value, it is subsequently determined whether or not the focus error analysis result (= FE amplitude) exceeds the specified value (step C7). If the specified value is exceeded, this determination is terminated without rotating at high speed.
[0043]
  If the focus error analysis result is less than the specified value, it is further determined whether or not the tracking error analysis result (= TE amplitude) exceeds the specified value (step C8). If the specified value is exceeded, this determination is terminated without rotating at high speed.trackingIf the error analysis result is less than the specified value, a high-speed rotation instruction is issued to restore the disk rotation speed (step C9).
[0044]
The present invention is not limited to the above embodiment.
[0045]
FIG. 8 shows another embodiment of the present invention. In the present invention, it is noted that the amount of shift in the normal direction with respect to the surface of the disk does not usually change significantly, and spike noise is set by setting an upper limit on the amount of change in the focus error signal between adjacent measurement points. The measurement noise such as is removed.
[0046]
When measurement of the FE signal is started, first, an initial value of the FE signal is acquired and registered as a previous value (D1 to D3).
[0047]
Subsequently, the counter F is cleared (D4). This is a variable having the same role as the counter A in FIG. The initial values are set to the FE maximum value and the FE minimum value, respectively, as in the previous embodiment (D5).
[0048]
Subsequently, an FE signal is acquired. When this changes more than the set value K in the positive direction or in the negative direction with respect to the previous value, it is reset to the previous value + −K (D7 to D10). ).
[0049]
Subsequently, the FE maximum value and the FE minimum value are updated using the corrected FE acquisition value (D11 to D15). Subsequently, the counter F is incremented. When the counter F reaches a specified value, the difference between the FE maximum value and the FE minimum value is stored as a focus error analysis result, and the next data acquisition is performed (D16 to D19).
[0050]
If it is desired to acquire the FE signal at a slower interval, this can be easily realized by inserting a delay device as appropriate in the innermost loop of FIG.
[0051]
FIG. 9 is a flowchart for explaining the operation of the tracking error signal analyzing apparatus according to another embodiment of the present invention.
[0052]
In the present invention, attention is paid to the fact that the amount of shift in the radial direction with respect to the surface of the disk usually does not change extremely greatly. By setting an upper limit on the amount of change in the tracking error signal between adjacent measurement points, spike noise, etc. The measurement noise is removed.
[0053]
When the measurement of the TE signal is started, first, an initial value of the TE signal is acquired and registered as a previous value (E1 to E3).
[0054]
Subsequently, the counter G is cleared (E4). This is a variable having the same role as the counter D in FIG. The initial value is set to each of the TE maximum value and the TE minimum value as in the previous embodiment (E5).
[0055]
Subsequently, a TE signal is acquired. When this changes more than the set value L in the positive direction or in the negative direction with respect to the previous value, it is reset to the previous value + −L (E7 to E10). ).
[0056]
Subsequently, the FE maximum value and the FE minimum value are updated using the corrected FE acquisition value (E11 to E15). Subsequently, the counter G is incremented, and when the counter G reaches a specified value, the difference between the FE maximum value and the FE minimum value is stored as a focus error analysis result, and the next data acquisition is performed (E16 to E19).
[0057]
If it is desired to acquire the FE signal at a slower interval, this can be easily realized by inserting a delay device as appropriate in the innermost loop of FIG.
[0058]
In the above description, the focus error signal is used. However, the present invention is not limited to this, and a focus actuator signal may be used. The focus actuator signal is generated based on the focus error signal as shown in FIG. 2, and is a signal directly supplied to the drive system of the pickup. Monitoring this actuator signal is equivalent to directly monitoring the upper limit of the control capability of the pickup drive system.
[0059]
In this case, the focus error signal analyzer 31 in FIG. 4 may be replaced with a focus actuator signal analyzer, and the focus actuator signal may be analyzed here. As a result, a processing form substantially similar to the flowchart of FIG. 5 can be realized, and motor control can be performed.
[0060]
In addition, although the above description has been made on the assumption that a tracking error signal is used, the present invention is not limited to this, and a tracking actuator signal may be used. The focus actuator signal is generated based on the tracking actuator signal as shown in FIG. 3, and is a signal directly supplied to the pickup drive system. Monitoring this actuator signal is equivalent to directly monitoring the upper limit of the control capability of the pickup drive system.
[0061]
In this case, the tracking error signal analyzer 33 in FIG. 4 may be replaced with a tracking actuator signal analyzer, and the tracking actuator signal may be analyzed here. As a result, a processing form substantially similar to the flowchart of FIG. 6 can be realized, and motor control can be performed.
[0062]
FIG. 10 is a flowchart for explaining the operation of another embodiment of the acceleration / deceleration determination device 37. When this apparatus operates, first, as in the case of FIG. 7, it is checked whether or not the disk quality is low (F1, F2). If the disk quality is so bad that reading fails, a low-speed rotation is instructed, and the counter E is reset (F7, F8).
[0063]
The counter E is the same as the counter E in FIG. 7, and is intended to prevent the high-speed rotation from being set for a while once the low-speed rotation is entered.
[0064]
If the disc quality is not low quality, the analysis result (FE amplitude) of the focus error signal is checked to check whether the FE amplitude exceeds the specified value a (F3, F4). When the specified value a is exceeded, the low speed rotation is instructed and the counter E is reset. When the FE amplitude is less than the specified value a, the tracking error analysis result (TE amplitude) is checked to check whether the TE amplitude exceeds the specified value b (F5, F6).
[0065]
If the specified value b is exceeded, the low speed rotation is instructed and the counter E is reset. If none of the above conditions is met, the counter E is incremented (F9). The subsequent operations are the same as those after the increment of the counter E in FIG.
[0066]
FIG. 11 is a flowchart showing the operation of still another embodiment of the tracking error signal analyzing apparatus.
[0067]
The tracking error signal is a signal that shows a valid value only during the period when the optical pickup is tracking. In other words, the tracking error signal should not be used effectively during the seek period of the optical pickup and during the period when the behavior of the pickup immediately after seeking is not stable.
[0068]
In the embodiment shown in FIG. 11, a conditional statement for determining whether a seek is being performed or not is inserted at an appropriate location in the control loop structure of the tracking error signal analyzer (B20). If it is determined by this conditional statement that seeking is in progress, the timer is cleared and the process returns to the beginning of data acquisition (B21). This timer is a delay time until the tracking error analysis result is treated as valid after the seek is completed.
[0069]
If not seeking, check the above timer value and if it is less than the reference value, that is, if the time elapsed since the timer was last cleared does not reach the set reference value (the timer does not clear), tracking error It moves to the head of control of the signal analyzer (B22). As a result, the TE maximum value and TE minimum value obtained at this time are not reflected in the tracking error analysis result. When not exceeding the reference value set by the timer and not being sought, the process is the same as in the case of FIG. Therefore, the same parts as those in FIG. 6 are denoted by the same reference numerals.
[0070]
FIG. 12 shows still another embodiment of the present invention.
[0071]
In FIG. 12, a position-quality correspondence data acquisition device 41 is further provided inside the spindle control device 16. In addition, a position-quality correspondence data unit 42 is connected to this apparatus.
[0072]
  The spindle control device constructs a database in a tabular format that stores a pair of addresses recorded on the disk, focus analysis results near the point, and tracking error analysis results. That is, the position-quality correspondence data acquisition device 41 creates position-quality correspondence data in the data unit 42 with reference to the acquired focus error analysis result and tracking error analysis result. In addition, the position-quality correspondence data acquisition device 41 is configured to accelerate / decelerate.JudgmentA required focus error analysis result and tracking error analysis result are handed to the device 41 according to the request of the device.
[0073]
FIG. 13 is a flowchart showing the operation of the position-quality correspondence data acquisition apparatus 41. The operation at the time of initialization operation after inserting the disc is shown. This operation is executed only once at an appropriate timing after the disc is loaded into the apparatus.
[0074]
In the initialization operation, the position-quality data is first cleared. Subsequently, an appropriate address on the disk from which data is to be obtained is set, such as 00:02:00 in the case of a CD-ROM. Subsequently, the set address is checked, and if the address indicates that all the planned addresses have been checked, the initialization operation is terminated. If there are still addresses to be checked, seek is performed to the set address, and the focus error analysis result and the tracking error analysis result are obtained. Then, the set address, the focus error analysis result, and the tracking error analysis result are paired and registered in the position-quality correspondence data. Subsequently, the set address is sent by a fixed amount, and the process is re-executed from the point where the address is checked.
[0075]
FIG. 14 is a flowchart showing the operation when the position-quality correspondence data acquisition device 41 provides the focus error analysis result and the tracking error analysis result data in response to the request of the acceleration / deceleration determination device during the operation of the disk drive device. It is.
[0076]
The position-quality correspondence data acquisition device 41 acquires an address on the disk to be accessed. Subsequently, the one closest to the current address is selected from a plurality of entries registered in the position-quality correspondence data, and the corresponding focus error analysis result and tracking error analysis result are acquired. Then, these analysis results are sent to the acceleration / deceleration determination device, and the process is terminated.
[0077]
In addition, the position-quality data is not collected at the time of initialization, but after the operation is started by a read command from the host computer, the focus error analysis result and tracking error analysis result at that time are The format of registering the quality correspondence data at any time can be realized with slight changes.
[0078]
As described above, in the present invention, for example, when reproducing a disc that includes a large amount of transition with respect to the normal direction of the disc, a reading error occurs when the portion that is difficult to read is reached. The speed is reduced. For this reason, the reading ability is improved and the portion can be read normally.
[0079]
Thus, if the period of normal reading continues to some extent, the conventional apparatus enters the reacceleration state unconditionally. This makes it difficult to read the disc again. However, in the present invention, even after the check by the counter E is completed after a certain period of time has passed, the focus error analysis result is checked to determine whether reading can be performed correctly even if the speed is increased. Since the high-speed rotation is instructed only when the FE amplitude is less than the specified value (and the TF amplitude is less than the specified value), the high-speed rotation can be instructed only when the state of the disk can be read at high speed. Become.
[0080]
If it is sufficient to pay attention only to the displacement in the normal direction of the disk, the tracking error signal input to the spindle controller and the tracking error signal analyzer in the present invention are omitted, and the tracking error analysis in FIG. The result condition judgment sentence can be omitted.
[0081]
Similarly, if it is sufficient to focus only on the radial displacement of the disk, the focus error signal input to the spindle controller and the focus error signal analyzer of the present invention are omitted, and the focus error signal in FIG. The condition judgment sentence of the analysis result can be omitted.
[0082]
If the disc has a large transition in the normal or radial direction of the surface, a read error will only occur when the optical pickup is no longer able to follow the information track of the disc, and only then In addition to reading errors, it often leads to loss of focus and tracking, and many times are required for recovery. According to the present invention, it is possible to decelerate the disk before a read error occurs by capturing the fact that the focus error signal and tracking error signal already have a large number of transitions before reaching the read error. As a result, reading of information on the disc can be continued without causing a reading error.
[0083]
Since the disk drive device does not update the tracking error analysis result during the seek and immediately after the seek, even if the optical pickup immediately after the seek is in an excessive state, the disk drive device does not operate (decelerate processing) on undesirable information.
[0084]
In addition, when an address that has not been accessed by the host computer is specified, for example, when random access is performed, there is no information about the disk quality of the position on the disk to be read. For this reason, conventionally, it has been necessary to seek to the target address and acquire the FE signal and TE signal there. With this method, on a very poor disk, the focus or tracking is lost at the moment of seeking near the target address, and even the seek is not completed.
[0085]
Therefore, according to the present invention, it is possible to appropriately decelerate by knowing the disk quality in the vicinity of the seek destination address in advance and prevent out-of-focus and out-of-track conditions.
[0086]
【The invention's effect】
As described above, according to the present invention, it is possible to simultaneously achieve a higher quality reading result and information reading as fast as possible.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration example of a disk drive device according to the present invention.
FIG. 2 is an explanatory diagram showing an example of extracting a focus error signal and a focus actuator signal according to the apparatus of the present invention.
FIG. 3 is an explanatory diagram showing an example of extracting a tracking error signal and a tracking actuator signal according to the apparatus of the present invention.
FIG. 4 is a diagram showing a configuration example of a spindle control device according to the apparatus of the present invention.
FIG. 5 is a flowchart showing an operation example of the apparatus of the present invention.
FIG. 6 is a flowchart showing another operation example of the apparatus of the present invention.
FIG. 7 is a flowchart showing an operation example of a spindle acceleration / deceleration determination apparatus according to the apparatus of the present invention.
FIG. 8 is a flowchart showing still another operation example of the apparatus according to the present invention.
FIG. 9 is a flowchart showing still another operation example of the apparatus according to the present invention.
FIG. 10 is a flowchart showing another operation example of the spindle acceleration / deceleration determination apparatus according to the apparatus of the present invention;
FIG. 11 is a flowchart showing another operation example of the apparatus of the present invention.
FIG. 12 is a diagram showing another configuration example of the spindle control apparatus according to the apparatus of the present invention.
FIG. 13 is a flowchart for explaining an operation example when initializing the position-quality correspondence data acquisition apparatus according to the apparatus of the present invention;
FIG. 14 is a flowchart for explaining an example of an operation at the time of seek and disk reading of the position-quality correspondence data acquisition apparatus according to the apparatus of the present invention;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Optical disk, 12 ... Motor, 13 ... Optical pick-up, 14 ... Signal processing part,
15 ... Pickup servo circuit, 16 ... Spindle controller, 17 ... Communication controller,
18: Host computer, 20: System control unit.

Claims (5)

An optical pickup for reading a signal from an optical disc, a circuit for generating a focus error signal, a tracking error signal, and reproduction data from the output of the optical pickup, and a spindle control capable of controlling the rotation speed of a spindle motor that rotates the optical disc In a disk drive device having a device,
The spindle control device uses at least one of the data error signal or focus error signal of the reproduction data as a determination element for decelerating and changing the rotation speed, and accelerates the rotation speed by using the data error signal and focus error signal of the reproduction data. A disk drive device characterized by being a determination element for changing . An optical pickup for reading a signal from an optical disc, a circuit for generating a focus error signal, a tracking error signal, and reproduction data from the output of the optical pickup, and a spindle control capable of controlling the rotation speed of a spindle motor that rotates the optical disc In a disk drive device having a device,
The spindle control device uses at least one of the data error signal or tracking error signal of the reproduction data as a determination element for decelerating and changing the rotation speed, and accelerates the rotation speed by using the data error signal and tracking error signal of the reproduction data. A disk drive device characterized by being a determination element for changing . 3. The disk drive device according to claim 2, wherein the spindle control device does not use the tracking error signal during and immediately after seeking the optical head as a determination element for changing the rotation speed . An optical pickup for reading a signal from an optical disc, a circuit for generating a focus error signal, a tracking error signal, and reproduction data from the output of the optical pickup, and a spindle control capable of controlling the rotation speed of a spindle motor that rotates the optical disc In a disk drive device having a device,
The spindle control device includes:
Either a data error signal or a focus error signal of the reproduction data is used as a determination element for decelerating and changing the rotation speed,
Furthermore, the data error signal and the focus error signal of the reproduction data are used as determination elements for changing the rotation speed at an acceleration. The maximum value and the minimum value are obtained by adding the focus error signal within a first fixed time. Generating and storing an amplitude value that is a difference between the maximum value and the minimum value as a focus analysis result;
Means for terminating the processing without increasing the rotational speed when the stored amplitude value exceeds a specified value when the second predetermined time has elapsed;
Disk drive apparatus characterized with. An optical pickup for reading a signal from an optical disc, a circuit for generating a focus error signal, a tracking error signal, and reproduction data from the output of the optical pickup, and a spindle control capable of controlling the rotation speed of a spindle motor that rotates the optical disc In a disk drive device having a device,
The spindle control device includes:
Either a data error signal or a focus error signal of the reproduction data is used as a determination element for decelerating and changing the rotation speed,
Further, the data error signal and the focus error signal of the reproduction data are used as determination elements for accelerating and changing the rotation speed, and the maximum value and the minimum value are obtained by adding the tracking error signal within a first fixed time. Means for generating and storing an amplitude value which is a difference between the maximum value and the minimum value as a tracking analysis result;
Means for terminating the processing without increasing the rotational speed when the stored amplitude value exceeds a specified value when the second predetermined time has elapsed;
Disk drive apparatus characterized with.

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