JPH11260008A - Servo write method and servo track writer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a servo write processing speed for a flexible magnetic disk medium and at the same time prevent the position deviation of a servo signal that is recorded also as an entire disk medium in a servo track writer. SOLUTION: A reference position signal for indicating a reference position is recorded by at least one magnetic head 18 out of a plurality of magnetic heads 18 and 18' for servo writing being provided at mutually different positions in the peripheral direction of a flexible magnetic disk medium 6. The reference position signal is read by each magnetic head 18' out of a plurality of magnetic heads, and a position for a reference position on the disk medium 6 of the magnetic heads 18 and 18' for recording a servo signal at mutually different regions on the disk medium 6 is corrected and controlled by a control means 16 and at the same time each servo signal is recorded at mutually different regions on the disk medium 6 by a plurality of magnetic heads 18 and 18'.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a servo write method and a servo track writer for recording a servo signal for accurately positioning a magnetic head of a floppy disk drive on a flexible magnetic disk medium.

[0002]

2. Description of the Related Art Heretofore, there has been provided a flexible magnetic disk medium in which magnetic layers are formed on both sides of a disk-shaped base made of a flexible polyester sheet or the like and signals can be magnetically recorded on the magnetic layers using a magnetic head. ing.

[0003] This flexible magnetic disk medium is usually provided as a floppy disk in which a hard center core (hereinafter also referred to as a hub) is mounted at the center of a disk and substantially the entirety is housed in a shell of plastic or the like. Because of their advantages such as easy handling and low cost, they are mainly used as recording media for computers. Zip, Hi among such floppy disks
In a high-density floppy disk such as an FD, it is necessary to position the magnetic head by closed loop control, and for this control, it is required to record concentric servo signals in advance on a flexible magnetic disk medium.

Here, as a servo write method for recording a servo signal on a flexible magnetic disk medium, there is a method in which a flexible magnetic disk medium alone is stored in a shell or a hub is attached to the center of the disk medium. There is known a method of recording a servo signal on a disk medium while moving the servo write magnetic head in a radial direction of the disk medium while rotating the medium around its rotation axis.

In the case of this method, from the viewpoint of improving the servo write processing speed, it is desirable to separately provide a magnetic head corresponding to each surface of the disk medium to simultaneously record servo signals on both surfaces of the disk medium.

FIG. 3 shows an example of a servo track writer for recording this servo signal. The illustrated servo track writer 10 chucks the hub 7 fixed to the center of the magnetic disk medium 6 of the floppy disk F to the spindle 11 by the magnetic attraction force of the hub chuck 12 provided on the upper part of the spindle 11. The magnetic disk medium 6 rotates with the rotation of the spindle 11, and the magnetic heads 18 for servo write, which are installed vertically facing each other so as to sandwich the floppy disk F, attach to the magnetic disk medium 6 during this rotation. The servo signal is recorded.

The servo write magnetic head 18 is mounted on a linear guide 20 provided on a guide 19a on a base 19 so as to reciprocate toward the center of the spindle 11, and is loaded at a predetermined position by a load mechanism (not shown). You. Further, a laser length measuring device 25 for detecting the position of the servo write magnetic head 18 is provided. A reflector 21 is installed on the linear guide 20, and a laser beam is emitted from the laser transducer 26 of the laser length measuring device 25 to the reflector 21 via the half mirror 27, and the reflected light is incident on the receiver 28 via the half mirror 27. The position is detected based on the length measurement. Then, the servo write magnetic head 18 is positioned and the actuator is driven in accordance with the length measurement.

A clock signal hard disk 13 is installed on the spindle 11 coaxially with the floppy disk F, and a clock signal is recorded and reproduced on the hard disk 13 by a reference clock head 15. As the clock signal hard disk 13 and the reference clock head 15, those of a known hard disk device can be applied.

[0009]

By the way, it is demanded that the recording speed of the servo signal on the magnetic disk medium by the servo track writer be further increased.

[0010] Here, the servo write processing time by the servo track writer depends on the number of rotations of the spindle holding the disk medium. Therefore, by increasing the rotation speed, the recording processing time can be reduced. However, due to the mechanical characteristics of the magnetic head, the suspension supporting the magnetic head, and the surface deviation of the disk media, the rotational speed of the spindle is actually at most
The upper limit is around 6000rpm.

Therefore, similarly to the case where the magnetic head for servo write is provided corresponding to each surface of the disk medium (for example, the embodiment of FIG. 3), a plurality of magnetic heads are provided on each surface, and the disk is formed by the plurality of heads. It is conceivable to record servo signals in mutually different areas on the medium. According to this recording method, it is considered that the servo write processing time can be shortened as the number of magnetic heads is increased.

However, when recording is performed using a plurality of magnetic heads as described above, even if a sequence of servo signals recorded by each of the heads is accurately formed by itself, the relative position between the heads is relatively small. Due to a shift (radial direction and circumferential direction) or the like, there is a possibility that a sequence of servo signals is not accurately formed on the entire disk medium.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above circumstances, and has been made in view of the above circumstances. It is an object of the present invention to improve a servo write processing speed for a flexible magnetic disk medium and to prevent a position error of a sequence of servo signals recorded on the entire disk medium. It is an object of the present invention to provide a write method and a servo track writer.

[0014]

SUMMARY OF THE INVENTION A servo write method and a servo track writer according to the present invention use a plurality of magnetic heads for recording servo signals and determine the positions of these magnetic heads with respect to a flexible magnetic disk medium. By performing correction control based on a reference position signal representing a reference position recorded at a predetermined position, the position of a row of servo signals recorded as the entire disk medium is prevented from being shifted, and the recording speed of the servo signal is improved. Things.

That is, the servo write method of the present invention
In a servo write method for rotating a flexible magnetic disk medium around its rotation axis and recording a servo signal on the disk medium while moving a servo write magnetic head in a radial direction of the disk medium, a plurality of servo write Magnetic heads are provided at different positions in the circumferential direction of the disk medium, and a reference position signal indicating a reference position is recorded on a part of the disk medium by at least one of the plurality of magnetic heads; The reference position signal is read by each of the other magnetic heads of the plurality of magnetic heads,
Based on the position of each magnetic head with respect to the reference position,
While correcting the position of each magnetic head so that the pattern of the servo signal to be recorded does not shift as a whole in the disk medium, the plurality of magnetic heads record the servo signals in different areas on the disk medium, respectively. It is characterized by doing.

Here, for a magnetic head in which an upper magnetic head and a lower magnetic head for simultaneously recording at the same corresponding position on the front and back surfaces of the disk medium are integrally formed, the upper magnetic head and the lower magnetic head are integrated. A head integrally formed is regarded as one magnetic head, and the "plurality of magnetic heads" in this case is defined as an integrally formed upper side magnetic head and lower side magnetic head. (Set) means plural.

In the case where two (or two) magnetic heads are used, for example, the two different positions in the circumferential direction of the disk medium refer to the positions of the two magnetic heads around the rotation center of the disk medium. It refers to a position at a predetermined angular interval other than 0 degrees in the circumferential direction, and it is desirable that the angular interval is symmetrical from the viewpoint of suppressing surface runout of the disk medium.
It is desirable to have an angle interval of degrees. As for the direction in which these two magnetic heads are moved, one is directed from the inner peripheral edge (rotation center) side of the disk medium to the outside in the disk radial direction, and the other is moved from the viewpoint of suppressing surface runout of the disk medium. It is desirable to face the disk radially inward from the outer peripheral side.

In such a configuration in which a plurality of magnetic heads are provided, it is desirable to uniformly suppress the surface wobble of the disk at the position of each magnetic head. It is more preferable to provide a deviation control means for restricting the deviation.

The above description of the servo write method can be similarly applied to the following servo track writer of the present invention.

The servo track writer of the present invention rotates a flexible magnetic disk medium around its rotation axis and records a servo signal on the disk medium while moving a servo write magnetic head in a radial direction of the disk medium. In a servo track writer, a part of the disk medium is formed by a plurality of servo write magnetic heads provided at different positions in a circumferential direction of the disk medium and at least one magnetic head among the plurality of magnetic heads. A reference position signal indicating a reference position is recorded, and the reference position signal is read by each of the other magnetic heads of the plurality of magnetic heads, and recorded based on the positions of these magnetic heads with respect to the reference position. The servo signal pattern is Control means for correcting the position of each magnetic head so as not to be displaced as a whole of the media and recording the servo signals in different areas on the disk medium by the plurality of magnetic heads. Is what you do.

The magnetic disk medium used in the servo write method and the servo track writer of the present invention may have a hard center core (hereinafter, also referred to as a hub) at the center of the disk. However, the magnetic disk medium alone having the center core may be used. Further, although this does not preclude the application of the disk medium to the state of a floppy disk housed in a shell of plastic or the like, a plurality of magnetic heads record servo signals. It is necessary to provide an opening in the portion of the shell corresponding to the upper position, which poses a practical problem.

[0022]

According to the servo write method and the servo track writer of the present invention, a plurality of magnetic heads for recording servo signals are provided, and the positions of these magnetic heads with respect to the flexible magnetic disk medium are set at predetermined positions on the magnetic disk medium. By performing the correction control based on the reference position signal representing the recorded reference position, it is possible to improve the servo write processing speed while preventing the displacement of the sequence of the servo signal recorded as the whole disk medium.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing a servo track writer 10 which is an example of a servo track writer for performing a servo write method according to the present invention.

The illustrated servo track writer 10 includes a spindle 11 that is rotationally driven by a rotary driving means such as a motor (not shown). On the upper end surface of the spindle 11, a flexible magnetic disk medium 6 accommodated in a floppy disk is mounted. A center pin is provided to protrude into a center hole of a hub (center core) 7 fixed to the center portion, and an upper end surface thereof is formed as a receiving surface of the hub 7, and a hub chuck 12 for chucking by a magnetic attraction force or the like is provided. Have.

It is preferable to use an air spindle as the spindle 11 in order to reduce runout. As the spindle 11 rotates, the hub 7 and the disk medium 6 chucked by the hub chuck 12 are maintained at a predetermined rotation.

A clock signal hard disk 13 is installed on the spindle 11 coaxially with the disk medium 6, and a clock signal is recorded and reproduced on the hard disk 13 by a reference clock head 15. A known hard disk device can be applied to the clock signal hard disk 13 and the reference clock head 15.

The spindle 11 and the reference clock head 15 are mounted on a surface plate 17. On the surface plate 17, two pairs of magnetic heads 18, 18 ′ for servo writing are further placed 180 ° with the rotation center of the disk medium 6 interposed therebetween. The magnetic heads 18 and 18 ′ are provided integrally with the upper magnetic head and the lower magnetic head so as to sandwich the disk medium 6 so as to sandwich the disk medium 6. . The magnetic heads 18 and 18 'for servo writing are mounted on bases 19 and 1 respectively.
Linear guides 20, 20 'provided on each guide 19a, 19a' on 9 'so as to reciprocate toward the center of the spindle 11.
And loaded at predetermined positions by a load mechanism (not shown). As this loading mechanism,
A known technique such as ramp loading is employed.

Here, the magnetic head 18 moves from the outermost peripheral portion Po of the servo signal recording area P of the disk medium 6 to the vicinity of the intermediate portion Pm in the radial direction.
While the magnetic head 18 'moves from the innermost peripheral portion Pi to the vicinity of the intermediate portion Pm while the disk medium 6 is rotating, the servo signal is recorded in this range. . In the vicinity of the intermediate portion Pm, the moving ranges of the magnetic heads 18 and 18 'are set to overlap. Both magnetic heads 18, 18 'have sliders 32, 32' having a head core having a plurality of head gaps fixed to the ends of suspensions 31, 31 ', respectively.

Further, a length measuring means (not shown) for detecting the radial position of each of the magnetic heads 18 and 18 'is additionally provided.

The control means 16 first controls the two pairs of magnetic heads
One of the magnetic heads 18 and 18 'records a reference position signal indicating a reference position near the intermediate portion Pm of the disk medium 6, and the other magnetic head 18' reads the reference position signal. Magnetic head 18, 18 '
The disk medium 6 on which the reference position signal is recorded
Magnetic head based on the positional relationship to the upper reference position
The pattern of the servo signal in the range on the outer circumference side (range from the outermost peripheral portion Po to the middle portion Pm in the radial direction) of the disk media 6 recorded by the recording medium 18 and the inner peripheral side of the disc medium 6 recorded by the magnetic head 18 ' The positions of the two magnetic heads 18 and 18 'are adjusted so that the servo signal pattern in the range (the range from the innermost peripheral portion Pi to the radially intermediate portion Pm) is accurately and concentrically formed as the entire disk medium 6. While correcting the relationship, while moving the magnetic head 18 from the outermost peripheral portion Po to the vicinity of the radial intermediate portion Pm, and moving the magnetic head 18 'from the innermost peripheral portion Pi to the vicinity of the radial intermediate portion Pm, The two magnetic heads 18 and 18 'control to simultaneously record servo signals in the respective ranges of the disk medium 6 described above.

Further, the servo track writer 10 of this embodiment is provided with a disk-shaped surface run-out control means 40 slightly larger than the disk medium 6 so as to sandwich the disk medium 6 from above and below. As shown in detail in FIG. 2A, the surface runout restricting means 40 comprises an upper restricting portion 41 and a lower restricting portion 42. The two restricting portions 41, 42 It is detachably held by means. In addition, both regulating portions 41 and 42 have a diameter direction,
In order not to hinder the loading of the magnetic heads 18, 18 ', the passage 41
a and 42a are formed.

FIG. 2B is a cross-sectional view taken along the line I--I of the surface deviation restricting means 40 shown in FIG.

Each of the magnetic heads 18, 1
This is for suppressing the runout of the disk 6 in the load range of 8 'to a certain range. If the function is achieved, the embodiment shown in FIGS. 2 (1) and 2 (2) is used. The present invention is not limited to this. Instead of the passages 41a and 42a, grooves 41a 'and 42a' as shown in the end view of FIG.

Next, the servo track writer of this embodiment
The operation of No. 10 will be described.

First, the disk medium 6 with the hub 7 fixed to the center thereof is set on the servo writer 10. This setting is based on the arrangement that the center hole of the hub 7 protrudes into the center pin of the spindle 11 and the hub 7 comes into contact with the receiving surface of the spindle 11.

Next, as shown in FIG. 1, the surface deviation restricting means 40 is disposed so as to sandwich the disk medium 6 from above and below.
The lower regulation part 42 of the surface deviation regulation means 40 may be arranged in advance.

Next, the spindle is operated by the operation of the control means 16.
The disk medium 6 set on the spindle 11 also rotates.

Here, the first magnetic head 18 for recording the servo signal in the outer peripheral range is loaded near the intermediate portion Pm of the disk medium 6 by the operation of the control means 16, and the reference position is set at a predetermined position of the medium 6. Is recorded. The load position of the first magnetic head 18 at the time of this recording is stored in the control means 16.

Next, a second magnetic head 18 'for recording a servo signal in the inner peripheral range is loaded near the intermediate portion Pm of the disk medium 6 by the operation of the control means 16, and is recorded at a predetermined position on the medium 6. The reference position signal is read. The second magnetic head 18 'when this reading is performed
Is also stored in the control means 16.

The control means 16 stores the stored first magnetic head.
On the basis of the load position of the second magnetic head 18 'and the load position of the second magnetic head 18', the pattern of the servo signal in the outer peripheral range of the disk medium 6 recorded by the first magnetic head 18 and the second magnetic head 18 'So that the pattern of the servo signal in the inner peripheral area of the disk medium 6 recorded by the' is formed concentrically accurately as a whole of the disk medium 6 while correcting the positional relationship between the two magnetic heads 18 and 18 '. The first magnetic head 18 is moved from the outermost peripheral portion Po to the vicinity of the intermediate portion Pm in the radial direction, and the second magnetic head 18 is moved.
18 'is moved from the innermost peripheral portion Pi to the vicinity of the radially intermediate portion Pm. During this movement, the disk medium 6 rotates at a constant speed, and both magnetic heads 18, 18 'simultaneously record servo signals at their respective positions.

As described above, according to the servo track writer of the present embodiment, the servo write processing speed for the disk medium 6 can be almost doubled as compared with a conventional magnetic head using a pair of servo writers. Even if there is a relative displacement (radial direction and circumferential direction) between the heads 18 and 18 ', the servo signal line is formed accurately and concentrically on the entire disk medium 6. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a servo track writer that is an embodiment of a servo track writer of the present invention.

FIG. 2 is a view showing a surface wobble restricting unit shown in FIG. 1;

FIG. 3 shows a conventional servo track writer.

[Explanation of symbols]

 6 Flexible magnetic disk media 7 Hub (center core) 10 Servo track writer 11 Spindle 12 Hub chuck 13 Hard disk for clock signal 15 Head for reference clock 16 Control means 17 Surface plate 18, 18 'Magnetic head for servo write 19, 19' base 19a, 19a 'guide 20, 20' linear guide 31, 31 'suspension 32, 32' slider 40

Claims (2)

[Claims] 1. A servo write method for recording a servo signal on a flexible magnetic disk medium while rotating a flexible magnetic disk medium about a rotation axis thereof and moving a servo write magnetic head in a radial direction of the disk medium. The servo write magnetic heads are provided at mutually different positions in the circumferential direction of the disk medium, and a reference position signal indicating a reference position on a part of the disk medium by at least one of the plurality of magnetic heads. The reference position signal is read by each of the other magnetic heads of the plurality of magnetic heads, and based on the position of each magnetic head with respect to the reference position,
While correcting the position of each magnetic head so that the pattern of the servo signal to be recorded does not shift as a whole in the disk medium, the plurality of magnetic heads record the servo signals in different areas on the disk medium, respectively. A servo write method. 2. A servo track writer for rotating a flexible magnetic disk medium around its rotation axis and recording a servo signal on the disk medium while moving a servo write magnetic head in a radial direction of the disk medium. A plurality of servo write magnetic heads provided at mutually different positions in the circumferential direction of the disk medium; and a reference indicating a reference position on a part of the disk medium by at least one of the plurality of magnetic heads. A position signal is recorded, and the reference position signal is read by each of the other magnetic heads of the plurality of magnetic heads. Based on the positions of these magnetic heads with respect to the reference position, the pattern of the servo signal to be recorded is changed. No misalignment of the entire disc medium While correcting the position of each magnetic head in earthenware pots, servo track writer, characterized in that a control means for recording each of said servo signals to different regions from each other on the disk medium by the plurality of magnetic heads.