JP3129246B2 - Disk unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head braking device for reading data or performing a read / write operation by moving a head such as a disk device, for example, a magnetic or optical disk device.

[0002]

2. Description of the Related Art Disk devices have been widely used as main storage devices with the spread of personal computers, and their storage capacities have been increasing rapidly. In such a situation, it has been required to reliably and accurately brake the head even when a seek error occurs.

As a method of driving this head, an analog method, a digital method, and the like have been developed so far, but each method has advantages and disadvantages, and there is no method satisfying desired requirements. It is. For example, analog type, when a seek error occurs,
Although the drive circuit of the head drive motor is turned off to mechanically apply a brake, the impact may be absorbed by a mechanical stopper. If the head runs away, the head may crash. There is also proposed a voice coil motor (VCM) used as a head drive motor for short-circuiting a coil to apply dynamic braking, but cannot provide a sufficient braking effect. As a digital type, Japanese Patent Application Laid-Open No. H06-1
As disclosed in Japanese Patent No. 87749, a VCM moving speed when a seek error occurs is detected, and braking is performed based on the detected value. FIG.
This will be described more specifically with reference to FIG. 6 and FIG.

FIG. 5 is a block diagram showing a configuration of a head control system of a conventional disk drive, and FIG. 6 is a block diagram showing a configuration of a VCM drive signal control device. In these figures, reference numeral 1 denotes a magnetic disk, 2 denotes a magnetic head, 3
Denotes a voice coil motor as a head drive motor (hereinafter simply referred to as a VCM (Voice Coil Motor)), and the VCM 3 supports the magnetic head 2 via an arm 2a. The magnetic head 2 is connected to the demodulation means 4, reads out a magnetization pattern previously written on the magnetic disk 1 at the time of reproduction, and sends it as a reproduction signal 5 to the demodulation means 4. The demodulator 4 demodulates the reproduction signal 5 into a head position information signal 6 and sends it to the head control signal generator 7.

[0005] The head control signal generating means 7 outputs the head position information signal 6 and the VC signal transmitted by the current detecting means 8.
Based on the M drive current signal 9 and during normal operation, a head seek / positioning signal 10 is generated and sent to a VCM drive signal control means 11 described later. The head seek / positioning signal 10 is for positioning the magnetic head 2 at a target position. The head control signal generating means 7 checks the status of the head position information signal 6 and the VCM drive current signal 9 to determine whether or not a seek error has occurred.
An error detection signal 12 sent to the drive signal control means 11 is turned on to notify each peripheral device of an abnormality. Further, the head control signal generating means 7
The moving speed at the time of seeking of the magnetic head 2 is obtained, and a head speed signal 13 is sent to the VCM drive signal control means 11.

The VCM drive signal control means 11 sends the head seek / positioning signal 10 to the voltage / current conversion means 15 as a VCM drive signal 14 during normal operation, and outputs a head braking control signal, which will be described later, to V when a seek error occurs.
A configuration for transmitting the CM drive signal 14 to the voltage / current conversion means 15 is adopted. The VCM drive signal 14 input to the voltage / current converter 15 is a VCM drive current 16
And transmitted to the VCM 3 via the current detecting means 8. That is, when the VCM drive current 16 flows through the VCM 3, the magnetic head 2 is positioned at the target position.

The VCM drive signal control means 11 includes a VCM braking signal generation means 17 and a circuit changeover switch 18 as shown in FIG. The VCM braking signal generating means 17 reads out a braking signal corresponding to the head speed signal 13 from the memory 19 when the error detection signal 12 is turned on, and sends it to the circuit switch 18 as a head braking control signal 20. I am taking it.

The braking signal includes information for decelerating the magnetic head 2, and divides the moving speed of the magnetic head 2 into speed regions having a predetermined speed range to calculate a representative value of each speed region. It is stored in the memory 19 as a braking signal table. Therefore, one memory 19 stores a plurality of braking signal tables having different speed ranges. That is,
When the moving speed of the magnetic head 2 exceeds the upper limit of the speed width in the low-speed braking signal table, the braking signal recorded in the high-speed braking signal table is used.
The reason why the braking signal is obtained from the braking signal table having the speed range is that the capacity of the memory 19 is limited.

The circuit changeover switch 18 connects a circuit to which the head seek / positioning signal 10 is transmitted to the voltage / current conversion means 15 during normal operation, and outputs the error detection signal 1
When the switch 2 is turned on, a circuit for transmitting the head braking control signal 20 from the VCM braking signal generating means 17 is connected to the voltage / current converting means 15. For this reason, when a seek error occurs, the circuit changeover switch 18 switches the circuit from the state shown in FIG. 6 and the head braking control signal 20 is sent to the voltage / current conversion means 15, and the VC
A current that decelerates the magnetic head 2 flows through M3.

[0010]

However, even if a configuration is adopted in which the magnetic head 2 is decelerated when a seek error occurs as described above, the magnetic head 2 cannot always be stopped after a seek error has occurred. For this reason,
When a seek error occurs and the magnetic head 2 is evacuated, parts of the support system of the magnetic head 2 collide with a stopper (not shown), and a large impact may be applied to the magnetic head 2.

The first reason that the magnetic head 2 cannot be stopped after a seek error occurs is that the head speed detected at the time of the seek error is not always accurate. The reason why the head speed detected at the time of the seek error is not accurate will be described below. The head speed is calculated (estimated) based on a combination of the position information and the motor drive current value. The main cause of the seek error is that errors in the estimated values of the position and speed increase due to the continuous reading of the position information. That is. If the error is not continuous even if the position information is incorrect, it is possible to use the estimated value instead of the observed value once and control without large disturbance, but if the position information cannot be read continuously, the error Since the next position and velocity are superimposed and estimated with the estimated value including, the error increases and the control is disturbed. As a result, when the position information is read next, it is difficult to determine whether the position information is correctly read or an error. Therefore, when a position detection error occurs twice consecutively, it is often the case that an error is determined and normal control is stopped.

When the position information cannot be read, the synchronization signal (servo mark signal) indicating the start point of the position information may not be detected, instead of simply misreading the position information. If not, it is necessary to retry from the operation of searching for a servo sector and resynchronizing. In such a case, the position and speed information after the error becomes completely unreliable.

For this reason, it is not reliable to apply the braking based on the speed information obtained using the position information after the seek error, and the runaway may be accelerated.

The second reason is that the braking signal is read from the braking signal table with reference to the speed at the time of the seek error, so that a certain amount of speed remains at the end of the braking control. This is because the braking signal to be read corresponds to a representative value of the speed range including the detected moving speed, and does not completely match the moving speed of the magnetic head 2.

Problems caused by using such a control signal table can be solved to some extent by increasing the number of braking signal tables and narrowing the speed range of each braking signal table. However, in order to increase the number of braking signal tables, a large-capacity memory 19 must be used, resulting in an increase in cost.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and a seek error occurs without relying on unreliable speed information based on data read by a head and with a small memory capacity. It is an object of the present invention to provide a disk device that can surely bring the head closer to a stopped state later.

[0017]

SUMMARY OF THE INVENTION The present invention is based on a disk apparatus comprising: a current detecting means for detecting a driving current of a head driving motor; and a current detecting means for detecting a driving current of the head. And control means for performing a head braking control operation based on the head position information obtained from the signal of (a), the control means includes an integrating means for integrating the current detected by the current detecting means, and And a head braking control means for performing a head braking control operation based on an integrated value obtained by the integrating means until a seek error occurs.

In the above-described disk device, braking is performed based on the integrated value, and reliable braking operation can be realized because it does not rely on speed information obtained by referring to position information after a seek error has occurred. The integration of the current is an approximation of the speed. Accuracy as speed is not always high because of influences such as friction, and when position information can be read correctly, speed estimation value obtained by combining both position information and current value has higher accuracy, When a seek error occurs and the reliability of the position information decreases, the estimated value greatly deviates. On the other hand, since the integration of the current value does not cause such a large disturbance, the information used for braking after a seek error has occurred is highly reliable.

In the above-described disk device, the control means determines the occurrence of an abnormality based on the current detected by the current detection means during the seek operation and the signal from the head, and sends a seek error signal to the head control signal generation means. Can be provided. By employing this configuration, the seek error can be detected not only from the integrated value but also using the signal read by the head.

According to a feature of the present invention, in the above-described disk drive, the head braking control means divides an integral value at the time of occurrence of a seek error by a predetermined head braking control signal to obtain a head braking control time. And a braking signal generating means for supplying a signal having a polarity opposite to the predetermined head braking control signal to the head driving motor during the set head braking control time . Another feature of the invention is that
In the above-described disk drive, the head braking control means comprises: computing means for dividing the integrated value at the time of occurrence of a seek error by a predetermined head braking control time to obtain a head braking control signal; and a polarity opposite to the obtained head braking control signal. Signal generating means for supplying a signal to the motor for driving the head.
In the disk device.

According to the present invention, since it is sufficient for the memory to store only a predetermined head braking control signal or a predetermined head braking control time used to perform the braking control, compared to the conventional A memory with a small capacity can be used.

Another feature of the present invention is that the disk
The head braking control means comprises: computing means for multiplying an integrated value at the time of occurrence of a seek error by a predetermined gain to obtain a predetermined head braking control signal for decreasing the braking value; and And a braking signal generating means for supplying the driving signal to the drive motor . is there
Another feature of the present invention resides in the disk device described above.
Therefore, the head braking control means generates a seek error.
Head braking control time to be braked from the integrated value
Between the calculating means and the obtained head braking control time,
A predetermined head braking signal of a polarity is applied to the head driving motor.
Disk device equipped with braking signal generating means for supplying
is there. According to such an embodiment of the invention, the braking current initially decreases significantly and gradually.

Still another feature of the present invention is the above-described digital
In the disc drive , the head braking control means is a means for repeating the head braking control operation until the integrated value when a seek error occurs becomes equal to or less than a predetermined value.
is there. According to the present invention, limits the number of executions of the brake control, not the time required to brake control becomes longer than necessary.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 is a block diagram showing an embodiment of a disk drive according to the present invention.
This will be described in detail with reference to FIG. Here, an embodiment in which the disk device according to the present invention is applied to a magnetic disk device will be described. FIG. 1 is a block diagram showing a configuration of a disk device according to the present invention, and FIG. 2 is a block diagram showing a configuration of a VCM drive signal control device. 3A and 3B are graphs showing signal waveforms. FIG. 3A shows a change in seek current, FIG. 3B shows a change in current integrated value, and FIG.
Shows the change in the braking current, and FIG. 4D shows the change in the VCM drive current. 5 and 6 in these figures.
The same reference numerals are given to the same or equivalent members as described above, and the detailed description is omitted.

In these figures, VCM indicated by reference numeral 21
The drive signal control means includes, as shown in FIG.
, Head braking control means 23, circuit changeover switch 24
And so on. This VCM drive signal control means 2
1 and the head control signal generating means 7 constitute a control means according to the present invention.

The integrating means 22 integrates the current flowing through the VCM 3 using the input VCM driving current signal 9,
The integrated value is sent as a VCM drive current integrated signal 25 to a head braking control means 23 described later. V
The CM drive current integration signal 25 is VCM3 from the start of the seek.
Is calculated by integrating the current that drives.

The head braking control means 23 comprises an error detecting means 26 for detecting the presence or absence of a seek error from the presence or absence of an error in the error detection signal 12 or the VCM driving current integration signal 25, and a head braking signal generating means 27. ing. The error detecting means 26 is configured to switch the circuit of the circuit changeover switch 24 when a seek error is detected. The head braking signal generating means 27
Employs a configuration in which a head braking control signal 28 is generated by using the VCM drive current integration signal 25 when the error detection means 26 detects a seek error, and is transmitted to the circuit changeover switch 24. The head braking control means 23 can output the error detection signal 12 even if there is no abnormality in the integrated value.
Indicates an abnormal state, a head braking control signal 28 is generated and the circuit of the circuit changeover switch 24 is switched.

When the head braking control means 23 does not detect a seek error, the circuit changeover switch 24 switches the circuit so that the head seek / positioning signal 10 is transmitted as the VCM drive signal 14, as shown in FIG. .

The head braking control signal 28 is generated by the head braking signal generating means 27 based on the result of the calculation executed by the calculating means 29 of the head braking signal generating means 27. The calculating means 29 adopts a configuration in which an integral value when a seek error occurs is divided by a predetermined head braking control signal to obtain a head braking control time. The head braking signal generating means 27 is configured to output the negative (reverse polarity) predetermined head braking control signal during the head braking control time obtained by the calculating means 29. The predetermined head braking control signal is generated by the head braking signal generating means 2.
7 is the output.

The head braking control signal 28 can be obtained as follows. That is, the calculating means 29
Is obtained by dividing the integral value obtained when a seek error occurs by a predetermined head braking control time to obtain a head braking control signal. A configuration in which a signal having the opposite polarity to the control signal is output may be employed.

Next, the operation of the disk device configured as described above will be described. The magnetic pattern for servo position information written on the magnetic disk 1 is converted into a reproduction signal 5 by the magnetic head 2 and then input to the demodulation means 4 where it is discriminated into a cylinder address, a position error signal, etc. Converted to signal 6. This head position information signal 6
Is input to the head control signal generation means 7.

On the other hand, the VCM driving current signal 9 detected by the current detecting means 8 is also input to the head control signal generating means 7 at the same time. The head control signal generating means 7 generates a head seek / positioning signal 1 based on these input signals.
0 is output to the VCM drive signal control means 21. The waveform of the head seek / positioning signal 10 is as shown in FIG. That is, after a positive current flows for a fixed time from the start of the seek, a negative current flows for a fixed time, and the magnetic head 2 reaches the target position through the acceleration / deceleration process.
FIG. 3A shows a state in which a seek error occurs during the deceleration period and the waveform changes.

The head control signal generating means 7
The input signal is inspected to determine whether an abnormality has occurred, and an error detection signal 12 indicating a normal / abnormal state is output to the VCM drive signal control means 21.

The VCM drive signal control means 21 checks the error detection signal 12 output from the head control signal generation means 7, and when the error detection signal 12 indicates a normal state, it is input from the head control signal generation means 7. The head seek / positioning signal 10 is output as a VCM drive signal 14. Further, when the error detection signal 12 indicates an abnormal state, the head braking control signal 28 is output as the VCM drive signal 14. VCM drive signal control means 21
The VCM drive signal 14 output from the VCM 3 is converted into a VCM drive current 16 by the voltage / current converter 15 and output to the VCM 3 via the current detector 8. As will be described later, when the VCM drive current integration signal 25 is abnormal, the operation is the same as when the error detection signal 12 is in an abnormal state.

The head seek / positioning signal 10 input to the VCM drive signal control means 21 is transmitted from the circuit changeover switch 24 to the voltage / current conversion means 15 by the VCM drive signal 14.
Is output as In the normal state, the integration means 22 integrates the current obtained from the VCM drive current signal 9,
The VCM drive current integration signal 25 is supplied to the head braking control unit 23.
To send to. Note that the head braking control means 23 resets the integral value at the start of the seek operation. As shown in FIG. 3B, the integral value increases at a constant rate from the start of the seek and then decreases at a constant rate according to the behavior of the magnetic head 2. If a seek error occurs as described above when the magnetic head 2 is in the deceleration stroke, the integration operation is not performed, and the integrated value becomes constant after the seek error occurs.

In the normal state, the head braking control means 23 operates only to check whether or not the VCM drive current integration signal 25 is abnormal. If an abnormality of the VCM drive current integration signal 25 is recognized during the seek operation, that is, if the integrated value is different from the value in the normal state shown by the dashed line in FIG. Indicates an abnormal state, the braking signal generating means 27 outputs the head braking control signal 28 based on the VCM driving current integration signal 25.
And switches the circuit at the circuit changeover switch 24 so that the head braking control signal 28 is sent to the voltage / current conversion means 15.

The waveform of the head braking control signal 28 is shown in FIG.
The result is as shown in FIG. That is, the braking current flows for the braking time set by the braking signal generating means 27 after the occurrence of the seek error. By transmitting the head braking control signal 28 to the voltage / current conversion means 15, V
The CM 3 executes the braking control, and drives the magnetic head 2 so that its moving speed decreases.

As a result, as shown in FIG.
The M drive current 16 becomes zero after a lapse of the braking time from the occurrence of the seek error, and the magnetic head 2 can be almost stopped when the braking control is completed.

Therefore, the disk drive shown in this embodiment is based on current detection means 8 for detecting a current for driving the VCM 3, and on the basis of the current detected by the current detection means 8 and a signal from the magnetic head 2. Control means (head control signal generation means 7 and VCM drive signal control means 21) for performing a head braking control operation based on the obtained head position information, wherein the control means is detected by the current detection means 8 Integrating means 22 for integrating the current
And a head braking control unit 23 that performs a head braking control operation based on the integrated value obtained by the integrating unit 22 when a seek error occurs. The braking current can be set based on the braking current. For this reason, a more reliable braking control can be implemented as compared with a case where a conventional method of estimating a head speed based on data read by the head 2 when a seek error occurs is employed.

Further, since the integrating means 22 is reset at the start of the seek, the integrated value can be updated every seek, so that the integrated value when a seek error occurs is accurate. Therefore, the braking control can be performed with high accuracy. Furthermore, the head braking control means 23 determines the occurrence of an abnormality from the current detected by the current detecting means 8 during the seek operation and the signal from the magnetic head 2 and generates a head control signal for transmitting the seek error signal 12. Because of the means 7, the seek error can be detected not only from the integrated value but also using the signal read by the magnetic head 2, and the reliability is high.

In addition, the head braking control means 23 obtains a head braking control time by dividing the integrated value at the time of occurrence of a seek error by a predetermined head braking control signal. Since the predetermined head braking control signal (of the opposite polarity) is supplied to the VCM 3, the memory used to execute the braking control stores only the predetermined head braking control signal and the head braking control time. Therefore, a memory having a smaller capacity than a conventional memory in which a plurality of braking signals are stored in a memory can be used. The calculating means 29 is configured to divide the integral value at the time of occurrence of a seek error by a predetermined head braking control time to obtain a head braking control signal. The same applies to a configuration in which a signal having the opposite polarity to the signal is supplied to the VCM 3.

Second Embodiment The head braking control means 23 can be configured as shown in FIG. FIG. 4 is a block diagram showing a configuration of a disk device according to another invention. In the figure, the same or equivalent members as those described in FIGS. 1 and 2 and FIGS. 5 and 6 are denoted by the same reference numerals, and detailed description is omitted.

The head braking control means 23 shown in FIG. 4 comprises a braking signal generating means 31 for outputting a head braking control signal 28.
And an error detecting means 32 for judging the presence or absence of an error in the error detection signal 12 and switching the circuit of the circuit changeover switch 25 when a seek error is detected. The braking signal generating means 31 is a calculating means 3 for multiplying an integrated value obtained when a seek error occurs by a predetermined gain.
3, and is configured to obtain a predetermined head braking control signal for decreasing the braking value based on the calculation result performed by the calculating means 33.

The operation of applying a gain by the calculating means 33 is also executed during the braking control. The gain during the braking control is set so that the integral value converges to zero. The integrating means 22 in this embodiment is configured to continue the integrating operation even after a seek error is detected so that the braking control can be performed until the integrated value converges to zero.

The feedback gain G is specifically set to, for example, G = 0.1 / T [1 / s]. Here, T is a sampling cycle, for example, T = 100 μS. In this case, G = 1000 [1 / s]. If the integrated value at the time of the error is, for example, 1 [mC] (C is Coulomb), the first braking current is 1 mC × 1000 [1 / s] = 1 [C /
s] = 1 [A]. At the next sampling time, the integrated value is 1 [mC] -1 [A] × 0.
1 [ms] = 0.9 [mC]. G is applied to make the next braking current 0.9 [A]. The next braking current has an integrated value of 0.9 [A] × 0.1 [ms] = 0.09 [mC].
Since it decreases to 0.81 [mC], it gradually decreases to 0.81 [A] by multiplying G, and then to 0.729 [A]. However, if the circuit is 1.5
Assuming that the integral value when an error occurs when saturation occurs in [A] and no more current can flow is 2 [mC],
Although the first braking current is 2 [A] in the calculated value, it cannot actually flow more than 1.5 [A], the integrated value is 1.85 [mC] at the next sampling time, and the next calculated value is 1.
Actually, a result of 1.5 [A] is obtained at 85 [A].

The braking time may be set in advance, or may be recorded in a table so as to correspond to the integral value, and may be read from the table according to the integral value when a seek error has occurred. Alternatively, it may be obtained by a proportional calculation from an integral value at the time of occurrence of a seek error. Further, the braking control may be executed until the integral value becomes equal to or less than a predetermined value.

Therefore, when a predetermined head braking control signal is obtained by multiplying the integral value by a gain as in this embodiment, the braking current gradually and gradually decreases at the beginning, and the magnetic head 2 is stopped when the braking control is completed. Can be almost stopped.

In the first and second embodiments described above, an example in which the present invention is applied to a magnetic disk device has been described. However, the present invention is applicable to other disk devices such as an optical disk device and a magneto-optical disk device. Can also be applied.

[0049]

As described above, according to the present invention, braking is performed on the basis of the integral value, and a reliable braking operation can be performed because it does not rely on speed information obtained by referring to position information after a seek error has occurred. realizable. The integration of the current is an approximation of the speed. Accuracy as speed is not always high because of influences such as friction, and when position information can be read correctly, speed estimation value obtained by combining both position information and current value has higher accuracy, When a seek error occurs and the reliability of the position information decreases, the estimated value greatly deviates. On the other hand, since the integration of the current value does not cause such a large disturbance, the information used for braking after a seek error has occurred is highly reliable. Therefore, the head can be almost stopped by the head braking control after the occurrence of the seek error.

Therefore, the performance and reliability of the braking control can be improved. As a result, when the head is evacuated after the seek error occurs, the evacuating operation is started from a state where the head is almost stopped, so that damage due to the head mechanism colliding with the stopper at high speed can be prevented.

Further, in the disk apparatus according to the above-mentioned invention, a head control signal generating means for judging the presence or absence of an abnormality from the current detected by the current detecting means and a signal from the head and transmitting a seek error signal is provided. Thus, the seek error can be detected not only from the integrated value but also using the signal read by the head.

According to another invention in which the integral value is divided by a predetermined head braking control signal or a predetermined head braking control time, only the head braking control signal or the head braking control time is stored in the memory used for executing the braking control. Can be stored, so that a memory having a smaller capacity than in the past can be used.

Accordingly, it is possible to provide a disk drive which is inexpensive because the capacity of the memory used is small and in which the head almost stops after the braking control.

According to another aspect of the present invention for obtaining a predetermined head braking control signal by multiplying the integral value by a gain, the head can be almost stopped because the braking current is initially decreased gradually and gradually.

According to another invention in which the head braking control operation is repeated until the integral value becomes equal to or less than the predetermined value, the number of times the braking control is executed is limited, and the time required for the braking control does not become unnecessarily long. The head can be almost stopped in as short a time as possible after a seek error has occurred.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a disk device according to the present invention.

FIG. 2 is a block diagram illustrating a configuration of a VCM drive signal control unit.

FIG. 3 is a graph showing a waveform of a signal.

FIG. 4 is a block diagram showing a configuration of a disk device according to another invention.

FIG. 5 is a block diagram showing a configuration of a head control system of a conventional disk device.

FIG. 6 is a block diagram illustrating a configuration of a VCM drive signal control unit.

[Explanation of symbols]

2 magnetic head, 3 VCM, 8 current detecting means, 7
Head control signal generation means, 21 VCM drive signal control means, 22 integration means, 23 head brake control means, 2
7, 31 ... braking signal generating means, 29, 33 ... calculating means.

Claims (6)

(57) [Claims] 1. A test current for driving the head drive motor
Output current detection means and the current detection means
Head position obtained from the measured current and the signal from the head
Control means for performing a head braking control operation based on the position information
And the control means is provided by the current detection means.
Integrating means for integrating the detected current, and from the start of the seek
By the integration means until the seek error occurs
Performs head braking control operation based on the integrated value obtained by
In a disk device having a head braking control means,
The head braking control means includes a calculating means for dividing the integral value when a seek error occurs by a predetermined head braking control signal to obtain a head braking control time, and the predetermined time during the obtained head braking control time. A disk device comprising: a brake signal generating means for supplying a signal having a polarity opposite to a head brake control signal to the head drive motor. 2. A method for detecting a current for driving a head driving motor.
Output current detection means and the current detection means
Head position obtained from the measured current and the signal from the head
Control means for performing a head braking control operation based on the position information
And the control means is provided by the current detection means.
Integrating means for integrating the detected current, and from the start of the seek
By the integration means until the seek error occurs
Performs head braking control operation based on the integrated value obtained by
In a disk device having a head braking control means,
The head brake control means includes a calculation means for obtaining a head brake control signal by dividing an integral value obtained when a seek error occurs by a predetermined head brake control time, and a head brake control signal having a polarity opposite to that of the obtained head brake control signal. A brake signal generating means for supplying a signal to the head drive motor. 3. A method for detecting a current for driving a head driving motor.
Output current detection means and the current detection means
Head position obtained from the measured current and the signal from the head
Control means for performing a head braking control operation based on the position information
And the control means is provided by the current detection means.
Integrating means for integrating the detected current, and from the start of the seek
By the integration means until the seek error occurs
Performs head braking control operation based on the integrated value obtained by
In a disk device having a head braking control means ,
The head braking control means includes a calculating means for multiplying an integral value obtained when a seek error occurs by a predetermined gain to obtain a predetermined head braking control signal for decreasing the braking value; and an obtained head braking control signal. And a braking signal generating means for supplying a brake signal to the head driving motor. 4. A method for detecting a current for driving a head driving motor.
Output current detection means and the current detection means
Head position obtained from the measured current and the signal from the head
Control means for performing a head braking control operation based on the position information
And the control means is provided by the current detection means.
Integrating means for integrating the detected current, and from the start of the seek
By the integration means until the seek error occurs
Performs head braking control operation based on the integrated value obtained by
In a disk device having a head braking control means,
The head braking control means includes a calculating means for calculating a head braking control time to be braked from an integrated value when a seek error has occurred, and a predetermined head braking signal having a reverse polarity during the obtained head braking control time. A disk device comprising: a brake signal generating means for supplying a motor for driving a head. 5. A method for detecting a current for driving a head driving motor.
Output current detection means and the current detection means
Head position obtained from the measured current and the signal from the head
Control means for performing a head braking control operation based on the position information
And the control means is provided by the current detection means.
Integrating means for integrating the detected current, and from the start of the seek
By the integration means until the seek error occurs
Performs head braking control operation based on the integrated value obtained by
In a disk device having a head braking control means,
The disk device according to claim 1, wherein said head braking control means is a means for repeating a head braking control operation until an integrated value when a seek error occurs becomes equal to or less than a predetermined value. 6. claimed in any one of claims 1 to 5
In the disk apparatus, the control means has a head control signal generating means for determining the occurrence of abnormality from a signal from the detected current and the head by the current detecting means during a seek operation, and sends a seek error signal A disk device characterized by the above-mentioned.