JP2008118818A - Disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk device which can properly detect a failure of a motor for rotating a disk while reproducing the disk. <P>SOLUTION: The disk device 101 comprises: the motor 1 which rotates the disk 200; a reproduction part 5 which reads data from the disk 200, and reproduces the disk 200 on the basis of the read data; a drive part 2 which feeds a drive voltage to the motor 1; a failure detection part 3 which detects the drive voltage when the motor 1 rotates the disk 200, when the reproduction part 5 reproduces the disk 200, and when the reproduction part 5 does not read data from the disk 200, and determines the failure of the motor 1 on the basis of the detected drive voltage; and a control part 4 which stops the operation of the drive part 2 when determined that the motor 1 is failed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a disk device, and more particularly to a disk device that detects a failure of a motor that rotates the disk.

  In a disk apparatus having a motor that rotates a disk using a spindle, brushes (electrodes) in the motor are worn and debris is generated, and a commutator (commutator) in the motor may be short-circuited by the generated debris. When the commutator is short-circuited, the spindle stops and the disk stops rotating. When the rotation of the disk stops, a control unit such as a CPU (Central Processing Unit) in the disk device increases the output current of a drive IC (Integrated Circuit) that drives the motor to increase the rotation speed of the spindle. Therefore, the driving IC generates heat due to a large current. Then, the drive IC may malfunction due to heat generation, causing a large current to flow through the actuator, which is a movable part in the pickup unit in the disk device, and burning the cover of the actuator or the like. Further, when the rotation of the disk is stopped, normal signals relating to focus and tracking cannot be obtained in the control unit. For this reason, when the control unit erroneously controls the drive IC, a large current flows from the drive IC to the actuator which is a movable part in the pickup unit in the disk device, and the cover of the actuator may burn.

  By the way, Patent Document 1 discloses the following motor failure detection method. That is, a current detection unit that detects a current flowing through the motor, a subtraction unit that outputs a current deviation based on a current command value input externally and the detected motor current value, and a PWM signal based on the current deviation A failure detection method for a motor drive device that includes a PWM signal generation unit that generates and supplies a motor to the motor. If the motor current value and the PWM signal are predetermined values, it is determined that a motor failure has occurred.

Patent Document 2 discloses a brushless motor abnormality detection device as described below. That is, at least a three-phase excitation coil, a motor shaft that rotates according to the excitation state of the excitation coil, a rotation sensor that detects the rotation of the motor shaft, and a phase switching signal pattern according to a change in the output of the rotation sensor Phase change control means for switching and outputting the phase change signal in a brushless motor abnormality detection device for supplying current to the respective phases of the exciting coil twice continuously according to the change of the phase change signal pattern. The current detection means for detecting the current supplied to each phase of the exciting coil for each pattern output, and the difference between the current detected by the current detection means at the previous phase switching signal pattern and the current detected current The current change calculating means for calculating and the state where the difference calculated by the current change calculating means is larger than the first predetermined value and the current is larger than the second predetermined value is detected twice in succession. And an abnormality determination unit that determines that come abnormality.
JP 2001-268984 A JP-A-6-261589

  However, Patent Document 1 and Patent Document 2 do not disclose a configuration for appropriately detecting a failure of a motor that rotates a disk during reproduction of the disk.

  SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a disk device that can appropriately detect a failure of a motor that rotates a disk during reproduction of the disk.

  In order to solve the above-described problems, a disk device according to an aspect of the present invention includes two brushes and three commutators, and reads and reads data from the disk, a DC motor that rotates the disk, and the disk. In a disk device including a reproducing unit that reproduces a disk based on data and a driving unit that applies a constant potential difference as a driving voltage between two brushes of the DC motor, the DC motor rotates the disk, and the reproducing unit The drive voltage is detected a plurality of times during the period when the playback unit stops reading data from the disk and restarts during the period during which the disk is playing back, and the maximum and minimum values of the detected drive voltages The threshold value is calculated, and one threshold value is selected from a plurality of preset threshold values based on the reproduction position of the disc when the drive voltage is detected. The selected threshold value is compared with the calculated difference, and the failure detection unit that determines the presence or absence of a failure of the DC motor based on the comparison result, and the operation of the drive unit are stopped when it is determined that the DC motor is defective And a failure detection unit that detects whether or not a motor has failed based on an operational amplifier in which an inverting input terminal and a non-inverting input terminal are electrically connected to two brushes in a one-to-one relationship. A failure determination unit for determining.

  A disk apparatus according to still another aspect of the present invention includes a motor that rotates a disk, a reproducing unit that reads data from the disk and reproduces the disk based on the read data, and a driving unit that supplies a driving voltage to the motor. And a motor that rotates the disk, a reproducing unit reproduces the disk, and a reproducing unit detects a driving voltage when data is not read from the disk, and the motor is based on the detected driving voltage. A failure detection unit that determines whether there is a failure, and a control unit that stops the operation of the drive unit when it is determined that the motor is in failure.

  Preferably, the failure detection unit sets the driving voltage during a period from when the reproduction unit stops reading data to the disk until the reproduction unit resumes during a period in which the motor rotates the disk and the reproduction unit reproduces the disk. Detection is performed a plurality of times, and the presence or absence of a motor failure is determined based on the detected plurality of drive voltages.

  More preferably, the failure detection unit determines the presence or absence of a motor failure based on the difference between the maximum value and the minimum value of the plurality of detected drive voltages.

  Preferably, the failure detection unit further selects one threshold value from a plurality of preset threshold values based on the reproduction position of the disk at the time of detecting the drive voltage, and the failure detection unit selects The threshold is compared with the detected drive voltage, and the presence or absence of a motor failure is determined based on the comparison result.

  Preferably, the motor is a DC motor including two brushes, the driving unit gives a constant potential difference as a driving voltage between the two brushes, and the failure detecting unit has two inverting input terminals and non-inverting input terminals. An operational amplifier electrically connected to each brush in a one-to-one relationship and a failure determination unit that determines the presence or absence of a motor failure based on the output of the operational amplifier.

Preferably, the motor is a DC motor including two brushes and three commutators.
A disk apparatus according to still another aspect of the present invention includes a motor that rotates a disk, a reproducing unit that reads data from the disk and reproduces the disk based on the read data, and a driving unit that supplies a driving voltage to the motor. And a plurality of threshold values set in advance based on the playback position of the disk at the time of detecting the drive voltage when the motor rotates the disk and the playback unit plays the disk. One threshold value is selected from the above, the selected threshold value is compared with the detected drive voltage, and a failure detection unit that determines the presence or absence of a motor failure based on the comparison result is determined to be a motor failure. A control unit that stops the operation of the drive unit.

  According to the present invention, it is possible to appropriately detect a failure of a motor that rotates a disk during reproduction of the disk.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

<First Embodiment>
[Configuration and basic operation]
FIG. 1 is a functional block diagram showing the configuration of the disk device according to the first embodiment of the present invention.

  Referring to FIG. 1, a disk device 101 includes a spindle motor 1, a driving IC (driving unit) 2, an operational amplifier 12, a disk reproducing unit 5, and a CPU 11. The disc reproducing unit 5 includes a pickup unit 13 and a signal processing unit 14. The CPU 11 includes a control unit 4 and a failure determination unit 15. The operational amplifier 12 and the failure determination unit 15 constitute a failure detection unit 3. The disk 200 is, for example, a CD (Compact Disk) or a DVD (Digital Versatile Disk).

  The CPU 11 controls each unit in the disk device 101. The control unit 4 in the CPU 11 outputs the reference voltage VREF and the offset voltage V1 to the drive IC 2 based on a signal representing the rotation state of the disk 200 received from the pickup unit 13.

  The drive IC 2 supplies a drive voltage to the spindle motor 1 via the voltage supply lines SP + and SP− based on the difference between the reference voltage VREF and the offset voltage V1 received from the CPU 11.

  The spindle motor 1 rotates the disk 200 by rotating the spindle based on the drive voltage received from the drive IC 2.

  The failure detection unit 3 detects the drive voltage that the drive IC 2 supplies to the spindle motor 1, and determines whether or not the spindle motor 1 has failed based on the detection result of the drive voltage.

  When the failure detection unit 3 determines that the spindle motor 1 is in failure, the control unit 4 stops the operation of the drive IC 2.

  The disc playback unit 5 reads data from the disc 200 and plays back the disc 200 based on the read data. More specifically, the pickup unit 13 includes an actuator (not shown) and performs focusing and tracking. The pickup unit 13 reads data from the disk 200 by irradiating the surface of the disk 200 with laser light while scanning in the radial direction of the disk 200 and converting the reflected light into an electric signal. The signal processing unit 14 performs reproduction processing of the disc 200 by performing demodulation processing, decoding processing, and the like on the read data received from the pickup unit 13.

FIG. 2 is a diagram showing the configuration of the spindle motor 1.
Referring to FIG. 2, spindle motor 1 is, for example, a DC (Direct Current) motor, and includes brushes B1 and B2, commutators C1 to C3, and coils L1 to L3.

  For example, the driving IC 2 sets the potential of the voltage supply line SP + to 3V and sets the potential of the voltage supply line SP− to 1V, thereby supplying the spindle motor 1 with a DC voltage of 2V as a driving voltage. That is, the drive IC 2 sets the voltage of the output terminal of the drive IC 2 connected to the voltage supply line SP + to 3V, and sets the voltage of the output terminal of the drive IC 2 connected to the voltage supply line SP− to 1V. A potential difference of 2 V is applied between the voltage supply lines SP + and SP−, that is, between the brushes B1 and B2.

  Then, based on the DC voltage supplied by the driving IC 2 via the voltage supply lines SP + and SP−, the DC current is supplied between the brushes B1 and B2 via a part of the commutators C1 to C3 and a part of the coils L1 to L3. Current flows.

  The commutators C1 to C3 rotate in conjunction with a rotation shaft (not shown). The presence / absence and direction of current flowing in the coils L1 to L3 change according to the rotation of the commutators C1 to C3, respectively, and rotation of a rotating shaft (not shown), that is, rotation of the spindle motor 1 is continued.

  Referring to FIG. 1 again, the operational amplifier 12 has a non-inverting input terminal electrically connected to the brush B1 via the voltage supply line SP +, and an inverting input terminal electrically connected to the brush B2 via the voltage supply line SP-. Connected to. The operational amplifier 12 outputs a voltage corresponding to the potential difference between the non-inverting input terminal and the inverting input terminal, that is, the driving voltage applied between the brushes B1 and B2, to the failure determination unit 15.

  The failure determination unit 15 determines failure of the spindle motor 1 based on the voltage received from the operational amplifier 12.

  FIG. 3A is a waveform diagram showing the voltage output from the control unit 4 to the drive IC 2. (B) is a waveform diagram showing a drive voltage supplied to the spindle motor 1 by the drive IC 2.

  Referring to FIG. 3A, the control unit 4 outputs the reference voltage VREF and the offset voltage V1 to the drive IC2. The control unit 4 supplies a pulse-like offset voltage V1 to the drive IC 2 based on a PWM (Pulse Width Modulation) method.

  Referring to FIG. 3B, drive IC 2 generates a DC voltage based on the difference between reference voltage VREF and offset voltage V1 received from control unit 4, and generates the generated DC voltage as voltage supply lines SP + and SP−. To the spindle motor 1.

  The polarity of the DC voltage supplied to the spindle motor 1 by the drive IC 2 is reversed depending on whether the offset voltage V1 is larger or smaller than the reference voltage VREF, and the rotation direction of the spindle motor 1 is reversed. In FIG. 3B, the first to third pulse voltages from the left are supplied to the spindle motor 1, and the fourth and fifth pulse voltages from the left are supplied to the spindle motor 1. The rotation direction of the spindle motor 1 is reversed in the case where it is supplied.

  Referring to FIG. 2 again, when the brushes B1 and B2 are worn out, brush residue is generated. Then, as the amount of brush residue entering between the commutators increases, the electrical resistance value between the brushes gradually decreases, and finally the brushes are completely short-circuited. Then, although the voltage of the waveform as shown in FIG. 3A is supplied from the control unit 4, the difference between the voltages appearing on the voltage supply lines SP + and SP−, that is, the drive IC 2 is supplied to the spindle 1. The driving voltage is gradually reduced to 0 V in a complete short state between the brushes.

[Operation]
FIG. 4 is a flowchart defining an operation procedure when the disk device according to the first embodiment of the present invention detects a failure of the spindle motor 1.

  During reproduction of the disc 200, the signal processing unit 14 performs demodulation processing, decoding processing, and the like on the read data received from the pickup unit 13. Here, compared with the speed at which the pickup unit 13 reads data from the disk 200, the speed at which the signal processing unit 14 performs demodulation processing, decoding processing, and the like is slow. For this reason, the signal processing unit 14 temporarily stores the read data received from the pickup unit 13 in a memory (not shown), but outputs a pause command to the CPU 11 when the memory is full.

  When receiving the pause command from the signal processing unit 14, the control unit 4 in the CPU 11 controls the pickup unit 13 to stop reading data from the disk 200. At this time, the control unit 4 controls the drive IC 2 to continue the rotation of the spindle motor 1.

  When the signal processing unit 14 outputs a pause command (YES in S1), the failure determination unit 15 in the CPU 11 supplies the voltage difference between the voltage supply lines SP + and SP−, that is, the drive IC 2 to the spindle motor 1. A drive voltage is acquired from the operational amplifier 12 (S2). When the control unit 4 supplies the pulsed offset voltage V1 to the drive IC 2, the failure determination unit 15 uses the amplitude of the portion where the offset voltage V1 is not 0V, that is, the H level portion as the drive voltage from the operational amplifier 12. get. Here, the operational amplifier 12 is configured to output the voltage difference between the voltage supply lines SP + and SP− as it is to the failure determination unit 15, but is not limited thereto. The operational amplifier 12 may be configured to output a voltage corresponding to the voltage difference between the voltage supply lines SP + and SP−. For example, the operational amplifier 12 outputs a voltage obtained by multiplying the voltage difference between the voltage supply lines SP + and SP− by an integer to the failure determination unit 15, and the failure determination unit 15 determines how many times the voltage difference between the voltage supply lines SP + and SP−. If it is recognized whether the signal is output from the operational amplifier 12, the failure determination unit 15 can acquire the drive voltage.

  On the other hand, the failure determination unit 15 stands by when the signal processing unit 14 does not output a pause command (NO in S1).

  When the signal processing unit 14 outputs a pause command (YES in S1), the failure determination unit 15 detects the reproduction position of the disc 200 when the drive voltage is acquired, for example, the address of the disc 200 (S3).

  The failure determination unit 15 stores a table indicating a correspondence relationship between a preset reproduction position of the disc 200 and a threshold value. Then, the failure determination unit 15 selects a threshold corresponding to the detected reproduction position of the disc 200 from the table (S4). For example, the failure determination unit 15 selects a small threshold when the playback position of the disc 200 is on the outer periphery of the disc, and selects a large threshold when the playback position of the disc 200 is on the inner periphery of the disc.

  The failure determination unit 15 compares the selected threshold value with the acquired drive voltage. If the drive voltage is less than or equal to the threshold value, the failure determination unit 15 determines that the spindle motor 1 has failed and notifies the control unit 4 (S5). YES)

  The control unit 4 receives the failure notification of the spindle motor 1 from the failure determination unit 15 and stops the reproduction process of the disk 200. More specifically, for example, the control unit 4 stops the current supply from the drive IC 2 to the spindle motor 1 by outputting the reference voltage VREF as the offset voltage V1 to the drive IC 2. That is, the drive IC 2 sets the voltage at the output terminal of the drive IC 2 connected to the voltage supply lines SP + and SP− to be equal (S6).

  On the other hand, the failure determination unit 15 compares the selected threshold with the acquired drive voltage, and determines that the spindle motor 1 is normal when the drive voltage is greater than the threshold (NO in S5). Then, the CPU 11 causes each unit in the disk device 101 to continue the reproduction process of the disk 200 (S7).

  Here, as shown in FIG. 2, when the spindle motor is a three-pole motor including three commutators, and only one of the gaps between the three commutators is short-circuited, A period in which no induced electromotive force is generated in the coil and a period in which it is generated are repeated. For this reason, the rotation speed of the spindle motor is slow, but it continues to rotate due to inertial force. However, in the disk device according to the first embodiment of the present invention, the failure detection unit 3 detects the drive voltage during reproduction of the disk 200, and determines whether or not the spindle motor 1 has failed based on the detected drive voltage. judge. With such a configuration, it is possible to detect a motor failure even when the disk is rotating.

  In the disk device according to the first embodiment of the present invention, the failure detection unit 3 includes the spindle motor 1 that rotates the disk 200, the disk reproduction unit 5 that reproduces the disk 200, and the disk reproduction unit 5 that Based on the drive voltage detected when data is not read from the disk 200, it is determined whether or not the spindle motor 1 has failed. With such a configuration, it is possible to detect a motor failure without increasing the processing load on the disk device 101 during reproduction of the disk 200.

  Further, in the disk device according to the first embodiment of the present invention, the drive voltage is irregularly detected according to the output of the pause command, and failure detection is performed. With such a configuration, it is possible to reliably detect a failure of a spindle motor including three or more commutators. Note that even in a spindle motor including two commutators, rotation may continue if the commutators are not completely short-circuited. In the disk device according to the first embodiment of the present invention, Such a failure of the spindle motor including two commutators can also be detected by appropriately selecting the threshold value.

  Here, CLV (Constant Linear Velocity) control is adopted in the disk device corresponding to CD and DVD. In the CLV control, the rotational speed of the inner circumference is faster than the outer circumference of the disk. Therefore, the drive voltage supplied from the drive IC 2 to the spindle 1 is greater when the playback position of the disk 200 is the inner periphery of the disk than when the playback position of the disk 200 is the outer periphery of the disk. Therefore, in the disk device according to the first embodiment of the present invention, the failure detection unit 3 detects the drive voltage when the disk 200 is played, and based on the playback position of the disk 200 when the drive voltage is detected. Then, one threshold value is selected from a plurality of preset threshold values, the selected threshold value is compared with the detected drive voltage, and the presence or absence of failure of the spindle motor 1 is determined based on the comparison result. For example, the failure determination unit 15 selects a small threshold when the playback position of the disc 200 is on the outer periphery of the disc, and selects a large threshold when the playback position of the disc 200 is on the inner periphery of the disc. With such a configuration, it is possible to appropriately detect a motor failure according to the reproduction position of the disk.

  In the disk device according to the first embodiment of the present invention, the failure determination unit 15 acquires the drive voltage from the operational amplifier 12 when the signal processing unit 14 outputs a pause command, and acquires the drive voltage of the spindle motor 1. Although the configuration is such that failure determination is performed, the present invention is not limited to this. The failure determination unit 15 may be configured to periodically acquire the drive voltage from the operational amplifier 12 and determine the failure of the spindle motor 1. However, the configuration in which the failure determination of the spindle motor 1 is performed when the signal processing unit 14 outputs a pause command is a preferable configuration in that the processing load on the disk device 101 can be reduced.

  Next, another embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

<Second Embodiment>
The present embodiment relates to a disk device in which the failure detection method is changed as compared with the disk device according to the first embodiment. The contents other than those described below are the same as those of the disk device according to the first embodiment.

  FIG. 5 is a flowchart defining an operation procedure when the disk apparatus according to the second embodiment of the present invention detects a failure of the spindle motor 1.

  During reproduction of the disc 200, the signal processing unit 14 performs demodulation processing, decoding processing, and the like on the read data received from the pickup unit 13. Here, compared with the speed at which the pickup unit 13 reads data from the disk 200, the speed at which the signal processing unit 14 performs demodulation processing, decoding processing, and the like is slow. For this reason, the signal processing unit 14 temporarily stores the read data received from the pickup unit 13 in a memory (not shown), but outputs a pause command to the CPU 11 when the memory is full.

  When receiving the pause command from the signal processing unit 14, the control unit 4 in the CPU 11 controls the pickup unit 13 to stop reading data from the disk 200. At this time, the control unit 4 controls the drive IC 2 to continue the rotation of the spindle motor 1.

  The failure determination unit 15 in the CPU 11 stands by when the signal processing unit 14 does not output a pause command (NO in S11).

  On the other hand, when the signal processing unit 14 outputs a pause command (YES in S11), the failure determination unit 15 supplies the voltage difference between the voltage supply lines SP + and SP−, that is, the drive IC 2 to the spindle motor 1. A drive voltage is acquired from the operational amplifier 12 at a predetermined interval (S12).

  If the drive voltage can be obtained for the half rotation of the disk 200, that is, if the output of the pause command from the signal processing unit 14 is continued for the half rotation period of the disk 200 (YES in S13). ), The maximum value and the minimum value are detected from the obtained plurality of drive voltages, and a difference VDIFF between the maximum value and the minimum value is calculated (S14). As described above, the configuration in which the drive voltage is acquired during the half-rotation period of the disk 200 makes it possible to reliably detect a decrease in electrical resistance value between the commutators or a short-circuit state in the spindle motor shown in FIG. Note that the period for acquiring the drive voltage is not limited to the half rotation period of the disk 200, and a period in which a decrease in the electrical resistance value between the commutators in the spindle motor 1 or a short state can be reliably detected can be set. it can.

  Then, the failure determination unit 15 detects the reproduction position of the disk 200 at the time of obtaining the drive voltage, for example, the address of the disk 200 (S15).

  The failure determination unit 15 stores a table indicating a correspondence relationship between a preset reproduction position of the disc 200 and a threshold value. Then, the failure determination unit 15 selects a threshold corresponding to the detected reproduction position of the disc 200 from the table (S16).

  The failure determination unit 15 compares the selected threshold value with the difference VDIFF. If the difference VDIFF is less than or equal to the threshold value, the failure determination unit 15 determines that the spindle motor 1 has failed and notifies the control unit 4 (YES in S17). ).

  The control unit 4 receives the failure notification of the spindle motor 1 from the failure determination unit 15 and stops the reproduction process of the disk 200. More specifically, for example, the control unit 4 stops the current supply from the drive IC 2 to the spindle motor 1 by outputting the reference voltage VREF as the offset voltage V1 to the drive IC 2. That is, the drive IC 2 sets the voltage at the output terminal of the drive IC 2 connected to the voltage supply lines SP + and SP− to be equal (S18).

  On the other hand, the failure determination unit 15 compares the selected threshold value with the difference VDIFF, and determines that the spindle motor 1 is normal when the difference VDIFF is greater than the threshold value (NO in S17). Then, the CPU 11 causes each part of the disk device 101 to continue the reproduction process of the disk 200 (S19).

FIG. 6 is a graph showing the difference VDIFF calculated by the failure determination unit 15.
Referring to FIG. 6, graph A shows a case where spindle motor 1 is normal, and graph B shows a case where spindle motor 1 is abnormal.

  As described above, since the disk device corresponding to CD and DVD employs CLV control, the rotational speed of the inner circumference is faster than the outer circumference of the disk. Therefore, the drive voltage supplied from the drive IC 2 to the spindle motor 1 is larger when the reproduction position of the disk 200 is the inner circumference than when the reproduction position of the disk 200 is the outer circumference. For this reason, as shown in graphs A and B, the difference VDIFF between the maximum value and the minimum value of the drive voltage in a predetermined period is such that the playback position of the disk 200 is higher than that when the playback position of the disk 200 is the outer periphery of the disk. The case of the inner circumference is larger.

  Further, the difference VDIFF between the maximum value and the minimum value of the drive voltage in the predetermined period is larger when the spindle motor 1 is abnormal than when the spindle motor 1 is normal.

  Therefore, the failure determination unit 15 selects a small threshold when the reproduction position of the disk 200 is the outer periphery of the disk, as in the case of the disk device according to the first embodiment of the present invention. If is the inner circumference of the disc, a large threshold is selected. With such a configuration, it is possible to appropriately detect a motor failure according to the reproduction position of the disk.

  By the way, in the disk device according to the first embodiment of the present invention, the failure detection unit 3 is configured such that the spindle motor 1 rotates the disk 200, the disk reproduction unit 5 reproduces the disk 200, and the disk reproduction unit 5 When data is not read from the disk 200, the drive voltage is detected only once to determine whether or not the spindle motor 1 has failed. For this reason, in the motor including three commutators as shown in FIG. 2, when the brushes B1 and B2 correspond to the commutators between which the electric resistance value does not decrease and the short circuit does not occur, When the drive voltage is detected, it is determined that the spindle motor 1 is normal.

  On the other hand, in the disk device according to the second embodiment of the present invention, the failure detection unit 3 has a period during which the spindle motor 1 rotates the disk 200 and the disk reproduction unit 5 reproduces the disk 200. Among these, the presence or absence of a failure of the spindle motor 1 is determined based on the drive voltage detected a plurality of times during the period from when the disk reproduction unit 5 stops reading data to the disk 200 to when it resumes. With such a configuration, the probability of detecting a motor failure can be increased and the motor failure can be detected more quickly than in the disk device according to the first embodiment of the present invention.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 is a functional block diagram showing a configuration of a disk device according to a first embodiment of the present invention. 1 is a diagram illustrating a configuration of a spindle motor 1. FIG. (A) is a wave form diagram which shows the voltage which the control part 4 outputs to drive IC2. (B) is a waveform diagram showing a drive voltage supplied to the spindle motor 1 by the drive IC 2. 3 is a flowchart that defines an operation procedure when the disk device according to the first embodiment of the present invention detects a failure of the spindle motor 1; 6 is a flowchart that defines an operation procedure when the disk device according to the second embodiment of the present invention detects a failure of the spindle motor 1. It is a graph which shows the difference VDIFF which the failure determination part 15 calculates.

Explanation of symbols

  1 spindle motor, 2 drive IC (drive unit), 3 failure detection unit, 4 control unit, 5 disk playback unit, 11 CPU, 12 operational amplifier, 13 pickup unit, 14 signal processing unit, 15 failure determination unit, 101 disk device, 200 discs, B1, B2 brushes, C1-C3 commutators, L1-L3 coils, SP +, SP- voltage supply lines.

Claims (8)

A DC motor that includes two brushes and three commutators and rotates the disk;
A reproducing unit for reading data from the disk and reproducing the disk based on the read data;
In a disk device comprising a drive unit that gives a constant potential difference as a drive voltage between the two brushes of the DC motor,
The driving voltage is applied during a period from when the reproduction unit stops reading data to the disk during the period in which the DC motor rotates the disk and the reproduction unit reproduces the disk. Detecting a plurality of times, calculating a difference between a maximum value and a minimum value of the detected plurality of drive voltages, and determining a plurality of preset threshold values based on the reproduction position of the disc at the time of detecting the drive voltage. A failure detection unit that selects one threshold value from among them, compares the selected threshold value with the calculated difference, and determines whether or not there is a failure in the DC motor based on the comparison result;
A controller that stops the operation of the drive unit when it is determined that the DC motor is faulty;
The failure detection unit
An operational amplifier in which an inverting input terminal and a non-inverting input terminal are electrically connected to the two brushes in a one-to-one relationship;
And a failure determination unit that determines whether or not the motor has failed based on an output of the operational amplifier. A motor that rotates the disk;
A reproducing unit for reading data from the disk and reproducing the disk based on the read data;
In a disk device comprising a drive unit for supplying a drive voltage to the motor,
The motor rotates the disk, the reproducing unit reproduces the disk, and the reproducing unit detects the driving voltage when data is not read from the disk, and the driving voltage is detected based on the detected driving voltage. A failure detection unit for determining the presence or absence of a motor failure;
A disk device comprising: a control unit that stops the operation of the drive unit when it is determined that the motor is out of order.   The failure detection unit is a period from the time when the reproduction unit stops reading data to the disk to the time when the reproduction unit reproduces the disk while the motor rotates the disk and the reproduction unit reproduces the disk. 3. The disk device according to claim 2, wherein the drive voltage is detected a plurality of times and whether or not the motor has failed is determined based on the detected drive voltages.   The disk device according to claim 3, wherein the failure detection unit determines whether or not the motor has failed based on a difference between a maximum value and a minimum value of the detected plurality of drive voltages. The failure detection unit further selects one threshold value from a plurality of preset threshold values based on the reproduction position of the disk at the time of detection of the drive voltage,
The disk device according to claim 2, wherein the failure detection unit compares the selected threshold value with the detected drive voltage, and determines the presence or absence of a failure of the motor based on the comparison result. The motor is a DC motor including two brushes;
The driving unit gives a constant potential difference as the driving voltage between the two brushes,
The failure detection unit
An operational amplifier in which an inverting input terminal and a non-inverting input terminal are electrically connected to the two brushes in a one-to-one relationship;
The disk device according to claim 2, further comprising a failure determination unit that determines whether or not the motor has failed based on an output of the operational amplifier.   The disk apparatus according to claim 2, wherein the motor is a DC motor including two brushes and three commutators. A motor that rotates the disk;
A reproducing unit for reading data from the disk and reproducing the disk based on the read data;
A drive unit for supplying a drive voltage to the motor;
The drive voltage is detected when the motor rotates the disk and the reproducing unit is reproducing the disk, and is set in advance based on the reproduction position of the disk when the drive voltage is detected. A failure detection unit that selects one threshold value from the plurality of threshold values, compares the selected threshold value with the detected drive voltage, and determines the presence or absence of a failure of the motor based on the comparison result; ,
A disk device comprising: a control unit that stops the operation of the drive unit when it is determined that the motor is out of order.

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