JPH11134824A - Servo information writing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation new vibration mode and reduce vibration of a magnetic disk itself during the servo information writing operation by fixing a magnetic disk drive to the threaded hole for fixing or to the area near the hole when it is used actually. SOLUTION: A head disk assembly HDA1 is provided with a threaded hole for fixing, for example, within PC during actual use and it is then rigidly fixed through such threaded hole to a frame 2 via a spacer 26 using a fixing screw 27. The frame 2 is positioned with the x reference pin and y reference pin provided in the base 11 of servo track writer so that HDA1 is located to the predetermined position and the frame 2 is fixed on the base 11 of servo track writer with a clamp 5. New vibration mode is never generated and increase of vibration of HDA1 itself can be prevented by fixing HDA1 to the frame 2 using the fixing screw during actual use. Moreover, vibration can be attenuated with a part of the fixing screw 27 and a part of the clamp 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a servo information writing device and a writing method for positioning a track of a head in, for example, a magnetic disk drive.

[0002]

2. Description of the Related Art Servo information of a magnetic disk drive is used for positioning a head on a target track.
Generally, servo information is written from outside using a head of a servo writer, or written using a head of a magnetic disk device itself. In recent years, with the increase in recording density, a data surface servo which writes servo information on a part of a data surface has become mainstream, rather than a servo surface servo having a disk surface dedicated to servo information.

In a conventional servo information writing apparatus, servo information is written by detecting the displacement of a carriage with an external sensor or the like to position the head. For example,
Install a mirror to reflect the laser beam at the measurement point,
The position of the head is determined by detecting the position of one point of the carriage with a high-resolution laser length meter and driving the actuator so as to match the target position.

In the case of a small disk having a disk diameter of 2.5 inches or less, a space for installing a mirror for reflecting a laser beam cannot be secured. Therefore, an external drive system in which a carriage is positioned by an external actuator is employed. I have. In this method, an actuator separate from the actuator of the magnetic disk drive itself and a laser length meter are provided outside, and this external actuator and the actuator of the magnetic disk drive itself are mechanically connected to each other, and the external actuator is positioned by the laser length gauge. Is used to move the head to a predetermined position.

By the way, even if the head is accurately positioned by the above-described head positioning method, the disk or the magnetic disk device itself vibrates due to the eccentricity of the disk or the vibration caused by the resonance of the bearing of the spindle motor. The writing accuracy was reduced.

In a servo information writing device, servo information is written by fixing an HDA (head disk assembly), which is a mechanical unit of a magnetic disk device, on the device in an assembled state. In order to accurately detect the displacement of the carriage of the HDA, it is necessary to install the HDA at a predetermined position with high accuracy with respect to a displacement detection sensor such as a laser length meter. Conventionally, as shown in FIG.
2, a reference plane for positioning the HDA 1 by the y (longitudinal) direction clamp 33 and the z (height) direction clamp 34 is used as an x reference pin 3, a y reference pin 4, and a z reference pin 2 respectively.
9, the HDA 1 is accurately positioned and fixed on the base 11 of the servo information writing device.

In such a fixing method, the HDA comes into contact with the reference pin at a line or a point, and the vibration generated by the spindle or the like of the HDA is reflected and hardly attenuated. It is difficult. Also, since the fixed point is different from when the magnetic disk device is actually used, a new vibration mode is generated and the HDA
Its own vibration may increase.

As a method of reducing the vibration of the disk or the magnetic disk device itself at the time of writing the servo information, for example, JP-A-8-263953 discloses an HDA (head disk assembly) which is a mechanism of the magnetic disk device. A method has been proposed in which servo information is written by incorporating the servo information into a high-rigid base integrated with a servo information writing device, and then re-incorporated into a normal base.

[0009]

In the conventional example disclosed in the above publication, the head eccentricity of the servo track and the positional relationship of the plurality of heads are shifted due to the inclination of the spindle or the carriage axis when the base of the HDA is rearranged. An inter-offset occurs, which can be a problem. Also, H
The time (tact time) required to write servo information for one HDA unit to incorporate and remove the DA from the base of the servo information writing device becomes longer than before.
Increasing the tact time reduces productivity and necessitates the addition of a servo information writing device.However, normal servo information writing is performed in a clean room, which increases the installation cost and operation cost of the device, and increases the manufacturing cost. It is likely to be connected.

An object of the present invention is to provide a servo information writing apparatus capable of writing high-quality servo information by reducing the vibration of the HDA itself without increasing the tact time.

[0011]

To achieve the above object, the present invention provides a disk-shaped recording medium, a head for exchanging information with the recording medium, and a carriage for supporting the head. A servo information writing device for writing servo information on the recording medium using the head, for a magnetic disk device including a carriage driving unit for driving the carriage to move the head along the recording medium And a magnetic disk device supporting means for supporting the magnetic disk device at or near a fixing screw hole when the magnetic disk device is used.

According to the above configuration, since the magnetic disk device is fixed at or near the screw hole for fixing when actually used, it is possible to prevent a new vibration mode from being generated, and to prevent the magnetic disk device from writing magnetic information when writing servo information. The vibration of the disk itself can be reduced.

The present invention also provides a disk-shaped recording medium,
A magnetic disk drive comprising: a head that exchanges information with the recording medium; a carriage that supports the head; and a carriage driving unit that drives the carriage to move the head along the recording medium. A servo information writing device for writing servo information on the recording medium using the head, wherein the magnetic disk device support means for supporting the magnetic disk device independently of the servo information writing device; and Fixing means for fixing the device support means on the servo information writing device.

According to the above arrangement, the magnetic disk device is firmly supported by the magnetic disk device support means so that vibration of the magnetic disk device itself can be reduced, and the magnetic disk device support means is fixed on the servo information writing device. This facilitates attachment and detachment, thereby suppressing an increase in tact time.

Further, the present invention provides a disk-shaped recording medium, a head for exchanging information with the recording medium, a carriage for supporting the head, and driving the carriage to record the head on the recording medium. A servo information writing device for writing servo information on the recording medium using the head with respect to a magnetic disk device having a carriage drive unit that moves along a medium, wherein a fixing screw for using the magnetic disk device is used. A magnetic disk device supporting means for supporting the magnetic disk device independently of the servo information writing device in or near the hole; and a fixing means for fixing the magnetic disk device supporting means on the servo information writing device. It is characterized by:

According to the above construction, the magnetic disk device support means firmly supports the magnetic disk device in or near the screw hole for fixing when the magnetic disk device is actually used, so that the magnetic disk device does not generate a new vibration mode. The vibration of the device itself can be reduced. Further, by fixing the magnetic disk device support means on the servo information writing device, the magnetic disk device support device can be easily attached and detached, thereby suppressing an increase in tact time.

Further, according to the present invention, in the servo information writing device having the above-mentioned structure, when the magnetic disk device supporting means is fixed on the servo information writing device by the fixing means, the servo information writing device is in direct contact with the magnetic disk device. The magnetic disk drive further comprises a positioning means for adjusting the position of the magnetic disk device on the device to a predetermined position.

With the above arrangement, the magnetic disk device support means is fixed in a state where the magnetic disk device is directly positioned on the servo information writing device. Can be positioned and fixed with high precision.

Further, according to the present invention, in the servo information writing apparatus having the above-mentioned structure, when the magnetic disk apparatus is supported by the magnetic disk apparatus supporting means, or when the magnetic disk apparatus supporting means is fixed on the servo information writing apparatus. In some cases, a means for absorbing or suppressing vibration is provided at a position in contact with the magnetic disk device.

According to the above configuration, the vibration of the magnetic disk device itself can be reduced by absorbing or suppressing the vibration, and the servo information can be written with high accuracy.

[0021]

Embodiments of the present invention will be described below.

FIG. 1 shows a configuration of a mechanical system of a servo track writer which is an example of a servo information writing apparatus according to the present invention. In FIG. 1, 1 is an H for writing servo information.
DA (head disk assembly: mechanical unit of the magnetic disk device), 2 is a frame that supports the HDA 1, and 3 is an HD when the frame 2 is fixed on a servo track writer.
An x reference pin for determining the position of A1 in the x (width) direction,
Reference numeral 4 denotes a y reference pin for determining the position of the HDA 1 in the y (longitudinal) direction, reference numeral 5 denotes a clamp for fixing the frame 2 on the servo track writer, and reference numeral 6 denotes a clock serving as a reference when writing servo information. , A push pin 7 for moving and positioning the head of the HDA 1, an external actuator 8 for driving the push pin 7, a laser length meter 9 for measuring the displacement of the push pin 10, and an external actuator 10 A corner cube 11 for reflecting the beam of the laser length meter is a base of the servo track writer to which the mechanism system of the servo track writer is attached.

Here, the frame 2 constitutes a magnetic disk device supporting means, and the clamp 5 constitutes a fixing means.

FIG. 2 shows an example of the configuration of the HDA and the servo track writer. In FIG. 2, 12
Is a disk on which servo information is written, 13 is a slider mounted with a head (not shown) for writing servo information on the disk 12, 14 is a load arm for pressing the slider 13 against the disk 12, and 15 is a slider 13 via the load arm 14. And a carriage 16 for positioning the slider 13 at an arbitrary position on the disk 12, a VCM (voice coil motor) 16 for driving the carriage 15,
7, a VCM control circuit for controlling the drive current of the VCM 5;
8 is a servo information writing circuit for writing servo information on the disk 12 using a head on the slider 13; 19 is a spindle for laminating and holding a plurality of disks 12;
0 is a spindle motor for rotating the spindle 19, 2
Reference numeral 1 denotes a spindle motor drive circuit that drives the spindle motor 20 to rotate at a constant speed, 22 denotes an MPU (microprocessor) that controls the entire operation, and 23 denotes a push pin that detects the displacement of the push pin 7 from the output of the laser length meter 9. The displacement detection circuit 24 is an external actuator control circuit that controls an external actuator so that the displacement of the push pin 7 output from the push pin displacement detection circuit 23 matches the target displacement output from the MPU 22. This is a housing that is hermetically sealed so as not to enter.

The HDA 1 is mounted on a highly rigid frame 2. The HDA 1 is positioned by the x reference pin 3 and the y reference pin 4 so that the rotation axis of the carriage 15 coincides with the rotation axis of the external actuator 8. It is fixed on the base 11 of the servo track writer. The push pin 7 is driven by an external actuator 8,
It can move on the same rotation axis as the carriage 15. The displacement of the push pin 7 is measured by reflecting the laser beam of the laser length meter 9 on the corner cube 10 attached to the external actuator 8, and converted into a displacement by the push pin displacement detection circuit 23. In the external actuator control circuit 24, the displacement of the push pin 7 is
The external actuator 8 is driven so as to match the target displacement output from the motor 22, and the push pin 7 is accurately positioned at a predetermined position.

A plurality of disks 12 are stacked and held on a spindle 19 in a housing 25 of the HDA 1, and are driven to rotate by a spindle motor 20. The spindle motor 20 is controlled by a spindle motor drive circuit 21 and its rotation speed is kept constant. Also, during the writing of servo information, the VCM control circuit 17
A constant drive current is applied to the carriage 16 and the carriage 15
Are pressed with a certain force against the push pin 7 and move together. The slider 13 is supported by the carriage 15 via the load arm 14, and is positioned at a predetermined position on the disk 12 by moving the carriage 15 by the push pin 7.

The clock head 6 first writes a clock signal of a fixed frequency for one rotation outside the recording area of the disk, and reproduces the clock signal when writing servo information. The servo information writing circuit 18 includes the slider 1
With the 3 positioned at the target position, servo information is written to the disk 12 using the head on the slider 13 in synchronization with the clock signal reproduced by the clock head 6. The MPU 22 controls the entire servo track writer.

FIG. 3 shows a flowchart of the procedure for writing servo information. In FIG. 3, S1 to S9 indicate step numbers. First of all, HD on the servo track writer
A1 is fixed (S1). Next, a command is sent to the spindle motor drive circuit 21 to start the spindle motor 20 and wait for the rotation speed to stabilize (S2). Then, the clock signal is written by the clock head 6 for one rotation (S3). Thereafter, the carriage 15 is pressed against the push pin 7 to move following the push pin 7 (S4), and the push pin 7 is moved to the outermost peripheral position (S5).

Next, the push pin 7 is moved so that the slider 13 comes to the next servo information write position (S
6). When the push pin 7 is settled, a command is sent to the servo information writing circuit 18 to
The servo information is written on the disk 12 in synchronization with the clock signal reproduced in step (S7). When the writing of the servo information for one track is completed, the push pin 7 is moved to the next servo information writing position. In this way,
After the positioning of the slider 13 and the writing of the servo information are repeated, and the servo information is written to all the tracks, the spindle motor 20 is stopped (S8), the HDA1 is removed from the servo track writer (S9), and the writing of the servo information is completed. I do.

In the configuration shown in FIGS. 1 and 2, the HDA 1 is mounted on the highly rigid frame 2 and the frame 2 is fixed on the base 11 of the servo track writer by the clamp 5 without increasing the tact time. H
The vibration of the DA itself is reduced, and high-quality servo information can be written. Hereinafter, a specific description will be given.

FIGS. 4 and 5 show a side view and a top view of the HDA fixing portion according to the first embodiment of the present invention. H
The DA 1 is provided with a screw hole for fixing it in, for example, a PC (personal computer) when it is actually used.
6, and is firmly fixed by a fixing screw 27. The frame 2 is positioned so that the HDA 1 comes to a predetermined position by the x reference pin 3 and the y reference pin 4 installed on the base 11 of the servo track writer, and the frame 2 is placed on the base 11 of the servo track writer by the clamp 5. Fix it. The frame 2 has x reference pins 3 and y
A hole is formed at a position corresponding to the reference pin 4, and the x reference pin 3 and the y reference pin 4 are positioned directly in contact with the reference surface of the HDA 1 through the holes, so that the HDA 1 has high precision. Positioning is possible.

If the HDA 1 is fixed as described above, the HDA 1 is fixed to the frame 2 by using the fixing screw holes when the HDA 1 is actually used. Therefore, when the HDA 1 is fixed by a conventional servo track writer, The new vibration mode that has occurred is not generated, and the vibration of the HDA 1 itself can be prevented from increasing. Further, the frame 2 is made of a high rigidity, and the entire mass is increased by firmly fixing the HDA 1 to the frame 2. Further, a fixing screw 27 for fixing the HDA 1 to the frame 2, Since the vibration is attenuated at the portion of the clamp 5 for fixing the head on the base 11 of the servo track writer, the vibration of the HDA 1 itself generated by the spindle motor 20 and the like can be reduced. It should be noted that a plurality of frames 2 are created, and another H2 is written while servo information is being written to a certain HDA 1.
If the DA1 is attached to and detached from the frame 2, the DA1 can be easily mounted on the base 11 of the servo track writer, so that the tact time does not increase and the productivity does not decrease.

In the first embodiment of the present invention, the positioning of the HDA 1 in the z direction is performed when the HDA 1 is fixed to the frame 2. FIG. 6 shows an example of a z-direction positioning method. The z-direction fixed jig 28 has an HDA1
A z reference pin 29 for determining the position in the z direction is provided, and a hole is formed in the frame 2 at a position corresponding to the z reference pin 29. Frame 2 on the z-direction fixing jig 28
Are placed on the z reference pin so that the HDA 1 is in contact therewith, positioned in the z direction, and fixed by the fixing screw 27. The z reference pin may be provided on the frame 2 or on the base 11 of the servo track writer.

As described above, the conventional servo track writer is positioned and fixed by pressing a surface serving as a reference for positioning the HDA 1 against a pin serving as a reference in each of the x, y and z directions. Because
Clamps in each of the x, y and z directions are required.
Further, since each clamp needs to be arranged at a position directly in contact with the HDA 1 and the place is limited, the conventional servo track writer clamping mechanism has a complicated configuration.

On the other hand, in the first embodiment of the present invention, since the frame 2 to which the HDA 1 is attached is fixed on the base 11 of the servo track writer, the clamp 5 is, for example, in the z-direction. It is also possible to use only the direction. Generally, the clamp 5 is disposed at a position farther from the HDA 1 than the conventional clamp position, and its layout can be changed depending on the position and shape of the clamp fixing portion of the frame 2. In comparison, the clamp mechanism can be simplified, and the design becomes easier.

FIG. 7 shows a side view of the HDA fixing portion according to the second embodiment of the present invention. H of frame 2
A vibration absorbing rubber 30 is provided at a portion in contact with DA1.
Here, the vibration absorbing rubber 30 constitutes means for absorbing or suppressing vibration. Since the vibration of the HDA 1 is absorbed by the vibration absorbing rubber 30, the vibration of the HDA 1 itself can be further reduced. In FIG. 7, the vibration absorbing rubber 30 is provided on almost the entire side and bottom surfaces of the HDA 1. However, the vibration absorbing rubber 30 may be provided only in a specific portion, or after the HDA 1 is fixed. The vibration absorbing rubber 30 may be in contact with the entire surface of the HDA 1 by attaching a cover or the like provided with the upper surface 30 to the upper surface.

The vibration absorbing rubber 30 may be provided not on the frame 2 but on the base 11 side of the servo track writer. In addition, HDA1
Is not limited to the vibration absorbing rubber 30,
Any material may be used as long as the material absorbs or suppresses vibration, and a dynamic vibration absorber or other active vibration damping mechanism may be provided.

FIG. 8 shows a top view of the HDA fixing portion according to the third embodiment of the present invention. In the present embodiment, the portion for fixing the HDA 1 of the frame 2 has a box shape with higher rigidity, and the frame 2 is fixed on the base 11 of the servo track writer by the bolt 31 instead of the clamp 5. It has become. As in the present embodiment, the frame 2 may have any shape as long as the rigidity does not decrease, and the method of fixing the frame 2 is not limited to the method described in the above embodiment.

In the above embodiment, the HDA 1
Is fixed to the frame 2 and the frame 2 is fixed on the base 11 of the servo track writer. This is because the screw hole of the HDA 1 provided for fixing when actually used or the vicinity thereof is provided. In this case, even if the HDA 1 is directly fixed on the base 11 of the servo track writer, the effect of suppressing the occurrence of a new vibration mode can be obtained.

Further, in the above-described embodiment, the HDA 1 is fixed to the frame 2 by using the screw holes of the HDA 1 provided for fixing when actually used. Is not limited to the one by the fixing screw 27, and may be fixed by one touch using a spring or the like, for example. Also, regarding the fixed place,
Even if the HDA 1 can be firmly fixed to the frame 2 even if the HDA 1 is firmly fixed to the frame 2 even if processing is performed separately at another place of the DA 1, it is possible to reduce the vibration of the magnetic disk device itself.

In the above embodiment, the x reference pin 3 and the y reference pin 4 are in contact with the HDA 1 even after the frame 2 is fixed on the base 11 of the servo track writer. After the frame 2 is fixed, the x reference pin 3 and the y reference pin 4 may be moved away from the HDA 1, for example.

Further, in the above embodiment, the case of the head positioning system using the push pins 7 and the external actuators 8 has been described, but the present invention is effective regardless of the head positioning system. For example, carriage 1
A mirror for reflecting a laser beam is installed on 5, a position of one point of the carriage 15 is detected by the laser length meter 9, and the head is positioned by driving the VCM 16 so as to coincide with the target position. It is also applicable to the self-drive positioning method.

According to the embodiment of the present invention, the frame 2
By making a plurality of HDDs and attaching / detaching another HDA 1 to / from the frame 2 while writing servo information of a certain HDA 1, it can be easily mounted on the base 11 of the servo track writer. It does not increase tact time and does not decrease productivity.

[0044]

As described above, according to the present invention,
Since the magnetic disk device is fixed at or near a screw hole for fixing when actually used, a new vibration mode can be prevented from occurring, and vibration of the magnetic disk itself when writing servo information can be reduced.

Further, the vibration of the magnetic disk drive itself can be reduced by firmly supporting the magnetic disk drive by the magnetic disk drive support means, and the magnetic disk drive support means can be attached and detached by fixing it on the servo information writing device. Since it becomes easy, the increase in the tact time is suppressed.

Further, since the magnetic disk device support means firmly supports the magnetic disk device in or near a screw hole for fixing when the magnetic disk device is actually used, the vibration of the magnetic disk device itself can be prevented without generating a new vibration mode. Can be reduced. Further, by fixing the magnetic disk device support means on the servo information writing device, the magnetic disk device support device can be easily attached and detached, thereby suppressing an increase in tact time.

In order to fix the magnetic disk device support means in a state where the magnetic disk device is directly positioned on the servo information writing device, the magnetic disk device is precisely positioned at a predetermined position on the servo information writing device. Can be fixed.

Further, the vibration can be reduced by absorbing or suppressing the vibration of the magnetic disk device itself, and the servo information can be written with high accuracy.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a mechanism system of a servo track writer according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of a configuration of an HDA and a servo track writer.

FIG. 3 is a flowchart showing an example of a procedure for writing servo information.

FIG. 4 is a side view of the HDA fixing unit according to the first embodiment of the present invention.

FIG. 5 is a top view of the HDA fixing unit according to the first embodiment of the present invention.

FIG. 6 is a diagram illustrating an example of a z-direction alignment method.

FIG. 7 is a side view of an HDA fixing unit according to a second embodiment of the present invention.

FIG. 8 is a top view of an HDA fixing unit according to a third embodiment of the present invention.

FIG. 9 is a diagram showing an example of an HDA fixing section of a conventional servo track writer.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... HDA, 2 ... Frame, 3 ... x reference pin, 4 ... y reference pin, 5 ... Clamp, 11 ... Base of servo track writer, 28 ... Z direction positioning jig, 29 ... Z reference pin, 30 ... Vibration absorbing rubber , 31 ... bolts.

Claims (1)

[Claims] 1. A disk-shaped recording medium, a head for exchanging information with the recording medium, a carriage supporting the head, and driving the carriage to move the head along the recording medium A servo information writing device for writing servo information on the recording medium using the head with respect to a magnetic disk device having a carriage driving unit to be moved; And a magnetic disk drive supporting means for supporting the magnetic disk drive.