JPH0755719Y2 - Runout correction device in disk device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a runout correction device in a disk device, and more particularly, in a removable type (disk exchangeable type) disk device, a runout (eccentricity) is provided for each side of the disk. ) A device that enables correction driving.

Conventional technology Conventionally, a stepping motor has been used to drive a head positioning mechanism in a magnetic disk device, but in the removable type, runout data is detected from a disk that has undergone cell flight servo to perform runout correction at the time of interchange. , The stepping motor is micro-step controlled based on the same data to execute the runout correction.

The structure of a conventional runout correction device is shown in FIG.

In this apparatus, first, when the disc replacement detection unit 51 detects an interchange, the timing control unit 52 operates the motor control unit 53 to rotate the spindle motor 54 and also performs the self flight servo on the data of the disc 55 to the head H0 ( Alternatively, the data is read by the head H1), and this data is converted into runout data by the runout data creation unit 56 and stored in the memory 57. Next, the timing controller
52 activates the correction drive amount setting unit 58, and the same unit 58 stores the memory 57.
Corresponding correction drive data is read out from the memory 59 based on the run-out data of 1 to set the correction drive amount. Next, the timing control unit 52 operates the motor control unit 60, and the control unit 60 controls the stepping motor 61 based on the setting data of the correction drive amount setting unit 58 to execute the correction drive by the head positioning mechanism 62. .

By the way, in the micro step control of the stepping motor, there is a relationship between the phase excitation and the drive amount as shown in Fig. 11, and the actual drive amount when changing the phase excitation does not have a linear relationship. , The actual drive amount becomes large in the step in the middle part between the A phase and the B phase, but the actual drive amount tends to become small in the step in the part close to the A phase or the B phase. That is, as shown in FIG. 12, the track position (T1 to T4) is A
A large actual drive amount can be obtained with respect to the instruction amount when in the middle of the phase and the B phase, but as shown in FIG. 13, when the track position (T5 to T8) is very close to the A phase or the B phase. Even with the same instruction amount, the actual drive amount becomes extremely small, and the linearity cannot be secured for the actual drive amount corresponding to the change from one phase to another phase.

Therefore, when the runout data is detected by the head H0 as described above and the runout correction is executed by giving the correction instruction amount based on the data, the actual driving amount of the head H0 is as shown in FIG. Although the amount is adapted to the indicated amount, the actual driving amount of the head H1 is insufficient and a correction error occurs. As a result, the possibility of off-track at the time of read / write in the disk device increases, and there arises a problem in reliability of data read / write.

DISCLOSURE OF THE INVENTION The present invention is directed to the side 1 at every disc interchange.
It is an object of the present invention to provide a runout correction device in which the read / write reliability of a disk device is improved by reading runout data from each side and side 2 and executing correction drive for each side based on each data. To do.

Means for Solving the ProblemsThe present invention is directed to a disk device that controls a motor that drives a head positioning mechanism every time a disk is interchanged to perform runout correction, and a disk replacement detection means that detects a disk interchange and a head H0, Head select control means for controlling the selector of H1, runout data creating means for creating runout data based on the data detected from each head, and runout data for heads H0 and H1 are stored at different addresses. 1 storage means, second storage means storing head correction drive data corresponding to runout data, and timing of head selection, runout data detection and storage when the disk exchange detection means detects a disk interchange Timing control to control The Based and stage, the head select signal from the host machine 1
A correction drive amount setting means for referring to the runout data of the corresponding address of the storage means, reading the correction drive data of the second storage means corresponding to the runout data, and setting the correction drive amount of the selected head; It is a configuration provided.

Basic Structure and Operation The basic structure of the present invention is shown in FIG.

DISCLOSURE OF THE INVENTION According to the present invention, a disk exchange detecting means 4 for detecting an interchange of a disk 1 in a disk device for performing run-out correction by microstep controlling a stepping motor 3 which drives a head positioning mechanism 2 every time an interchange of the disk 1 is made by self flight servo. A head select control means 6 for controlling the selectors 5 of the heads H0, H1, a runout data creating means 7 for creating runout data based on the data detected from the heads H0, H1, and the heads H0, H1. First storage means 8 for storing runout data at different addresses, and runout data creating means 7 corresponding to the selected state of the head.
Addressing means 9 for storing the runout data created by the first storage means 8 at a predetermined address, a second storage means 10 for storing the correction drive data of the heads H0 and H1 corresponding to the runout data, and a disk exchange detection means. If 4 detects an interchange on disk 1, head H
Timing control means 11 for controlling the timing of 0 and H1 selection and detection and storage of runout data, and the runout data of the corresponding address of the first storage means 8 is referred to based on the head select signal from the host machine. The corrected drive data of the second storage means 10 corresponding to the runout data is read and the selected head (H0 or H1)
And a correction drive amount setting means 12 for setting the correction drive amount of the above, and relates to a runout correction device for driving the stepping motor 3 of the head positioning mechanism 2 in micro steps by the correction drive amount set by the correction drive amount setting means 12.

The runout correction device of the present invention operates as follows.

First, when the disk replacement detection means 4 detects an interchange, the timing control means 12 controls the selector 5 by the head selection control means 6 to select the head H0. Further, the timing control means 12 activates the spindle motor 14 by the motor control means 13 and causes the head H0 to read the servo data of the disk 1. This data is converted into runout data by the runout data creating means 7. On the other hand, the select data of the head select control means 6 is output to the address designating means 9, and the address designating means 9 designates a predetermined address of the first storage means 8 to store the runout data at the same address. When this storage is completed, the timing control means 11 controls the selector 5 by the head select control means 6 to select the head H1, and similarly the runout data relating to the servo data read by the head H1 becomes the first.
It will be stored in the storage means 8. However, in this case, since the head select control means 6 selects the head H1, the address designating means 9 executes the address designation different from the above and stores the runout data in another address area.

When the head select signal is input from the host machine after each runout data is thus stored in the first storage means 8, the correction drive amount setting means 12 causes the runout of the first storage means 8 corresponding to the select signal. Refer to the data,
Further, the correction drive data of the second storage means 10 corresponding to the referenced runout data is read out, the correction instruction amount is set, and it is transferred to the motor control means 15.

The motor control means 15 controls the stepping motor 3 in microsteps on the basis of the correction instruction amount, but the runout data read by the head corresponding to the head select signal from the host machine is referred to and the correction instruction amount is set. Since it is set, the optimum runout correction drive can be performed without being affected by the non-linearity of the actual head drive amount with respect to the phase excitation change.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 2 to 9.

FIG. 2 shows a system circuit diagram of a runout correction device relating to a removable type disk device. In the figure,
21 is a self-servo disk, 22 is a head H0
Head positioning mechanism for positioning H1, 23 stepping motor for driving head positioning mechanism, 24 spindle motor, 25 index sensor, 26 amplifier, 27
Is an interchange detector, 28 is a selector for heads H0 and H1, 29 is a spindle motor control circuit, 30 is a stepping motor drive circuit, 31 is a step control circuit, 32 is a microstep control circuit, 33 is a D / A converter, 34 Is lead /
Write amplifier, 35 erase gap detector, 36 servo sample timer, 37 A and B burst divider, 38 A burst sample hold circuit, 39 B burst sample hold circuit, 40 analog data selector, 41 A / D
A converter 42 is an interface between the host machine and the disk drive, and the runout data detection procedure and the control procedure of the motors 23 and 24 are executed by the microcomputer circuit by these circuits.

The microcomputer circuit includes a RAM 43 that stores runout data, a ROM 44 that stores a system operation program,
ROM45, CPU46, and I / O that store the correction data table
The port 47 is provided, and the CPU 46 reads out and executes the program in the ROM 44 to store the runout data, set and output the correction drive amount, and the like through the I / O port 47.

The procedure of recording runout data and the runout correction drive based on the data will be described below with reference to the flowcharts of FIGS. 3 and 4.

First, when there is an interchange of the disk 21, the interchange detection unit 27 detects this and the CPU 46 confirms the interchange via the I / O port 47 (step).

With this confirmation, the CPU 46 selects the selector via the I / O port 47.
A select signal is output to 28 to select the head H0 (step). Further, the CPU 46 also outputs a signal to the spindle motor control means 29 to rotate the disk 21, and causes the head H0 to detect the data subjected to the self flight servo on the side 0 of the disk 21 (step).

The detected data is the selector 28, read / write amplifier.
34 through A, B burst divider 37 A burst sample hold circuit 38 and B burst sample hold circuit 39
However, the servo sample timer 36 manages the burst detection timing due to the runout based on the output pulse of the index detection sensor 25. This self flight servoed disc 21 and heads H0, H1
The positional relationship with and is shown in FIG. 5, and the generation state of the burst signal due to runout is shown in FIGS. 6 to 8. That is,
In FIG. 5, when there is no runout (when the head is at the reference position), the A and B bursts are the same as shown in FIG. 6, but there is a runout in which the head 21 is biased toward the outer peripheral side. In this case, as shown in FIG. 7, A burst> B burst. On the contrary, when there is a runout in which the head 21 is biased toward the inner circumference side, A burst <B burst as shown in FIG. Become.

Each data of the A and B bursts held in the sample hold circuits 38 and 39 is selected by the analog selector 40 and sequentially A / B
After being quantized by the D converter 41, it is taken into the microcomputer circuit from the I / O port 47 and is used as runout data.
It is stored in the predetermined address area (ADD0) of the RAM 43 (step).

When this storage is completed, the CPU 46 switches the selector 28 to H1 via the I / O port 47 (step). Then, in the same procedure as described above, the data subjected to the self flight servo on the side 1 of the disk 21 is detected by the head H1 and the detected runout data is stored in the predetermined address of the RAM 43. In this case, Is stored in an address area (ADD1) different from the address area (ADD0) of (step).

By the above procedure, the runout data of the heads H0 and H1 for the sides 0 and 1 of the disk after the interchange are stored in the RAM 43, respectively, and the recording of the runout data is completed.

The procedure of the runout correction driving is shown in FIG. When a select signal for head Hi (i = 1 or 2) is input from the host machine to the disk drive I / F 42 (step), the CPU 46 detects this via the I / O port 47.

By this detection, the CPU 46 refers to the runout data of the side i (runout data detected by the head Hi) stored in the RAM 43, and the correction data corresponding to the data is read out from the ROM 45.
And outputs it to the D / A converter 33 via the I / O port 47. The D / A converter 33 converts the correction data into an analog amount and outputs it to the microstep control circuit 32, and the stepping motor drive circuit 30 which receives it outputs the stepping motor 23 by microstep control to execute the runout correction drive. Will be done (step).

The correction data read from the ROM45 sets the correction drive amount by microsteps, but the runout data referred to when reading this correction data is the address area of the RAM43 when the host machine selects the head H0. This is the data of (ADD0) and becomes the data of the address area (ADD1) when H1 is selected.

Therefore, the heads 0 and 1 are corrected and driven with the optimum drive amounts for the read / write on each side 0 and 1 of the disk 21, and a correction error occurs due to the non-linearity of the actual drive amount with respect to the change in the phase excitation of the stepping motor 23. There is no such thing. That is, as shown in FIG. 9, the stepping motor 23 is extremely faithfully driven with respect to the instruction amount based on the runout data recorded by the head Hi, and the head Hi is corrected and driven to the optimum position.

Effect As described above, in the present invention, the removable type disk device records runout data on both sides of the disk each time there is an interchange on the disk that has undergone cell flight servo, and sets the runout correction drive amount for each head based on that data. Therefore, it is possible to eliminate the influence of the non-linearity of the actual drive amount on the phase excitation state of the stepping motor that drives the head positioning mechanism.

As a result, the optimum runout correction drive can be performed according to the head select of the host machine, and the read / write of the disk device can be performed.
Off-track at the time of writing is reduced, and reliability related to data read / write is improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a basic configuration of the present invention, FIG. 2 is a system circuit diagram of a runout correction device relating to a removable type disk device, FIG. 3 is a flow chart showing a runout data recording procedure, and FIG. 4 is a runout. FIG. 5 is a flow chart showing a correction driving procedure, FIG. 5 is a diagram showing a positional relationship between a disk and a head which are self-servo-servoed, FIG. 6 to FIG. 8 are diagrams showing A and B burst generation modes, and FIG. The horizontal axis represents the rotation angle of the stepping motor, the vertical axis represents the drive amount, and a graph showing the actual drive amount of the head with respect to the instruction amount based on the runout data. FIG. 10 is a diagram showing the configuration of a conventional runout correction device. The figure shows the relationship between the phase excitation instruction amount of the stepping motor and the actual drive amount. Figures 12 and 13 show the positional relationship between the excitation phase of the stepping motor and the disk track. Figure, Fig. 14 rotation angle of the stepping motor in the horizontal axis takes the drive amount on the vertical axis is a graph showing the actual driving of the head to the indicated amount based on the run-out data. 1 ... Disk, 2 ... Head positioning mechanism, 3 ... Stepping motor, 4 ... Disk replacement detecting means, 5 ... Selector, 6 ... Head select control means, 7 ... Runout data creating means, 8 ... First storage means, 9 ... Address Designating means, 10 ... Second storage means, 11 ... Timing control means, 12 ...
Correction drive amount setting means, 13 ... Motor control means, 14 ... Spindle motor, 15 ... Motor control means

Claims (1)

[Scope of utility model registration request] 1. A disk device for performing runout correction by controlling a motor for driving a head positioning mechanism each time a disk interchange occurs, and controls disk exchange detection means for detecting a disk interchange and selectors for heads H0 and H1. Head select control means, runout data creating means for creating runout data based on data detected from each head, first storage means for storing runout data for heads H0 and H1 at different addresses, and runout Second storage means for storing head correction drive data corresponding to the data, and timing control for controlling the timing of head selection, runout data detection and storage when the disk exchange detection means detects a disk interchange. Means and host machine Based on the head select signal from the first storage means, the runout data of the corresponding address of the first storage means is referred to, the correction drive data of the second storage means corresponding to the runout data is read, and the correction drive of the selected head is performed. A runout correction device comprising: a correction drive amount setting means for setting an amount.