JPH04157683A - Magnetic disk drive and disk used for this device and its built-in - Google Patents

Abstract

PURPOSE:To enable stability, reliability etc. to be improved by providing a reference part for prescribing a rotary center position for writing servo information on a disk which is incorporated in a magnetic disk drive. CONSTITUTION:A servo disk 25 where servo information is recorded being positioned at a center which is sandwiched by disks 5 holds a donut-shaped circular plates 26 from both sides concentrically with ring members 27 and 28 and is clamped together with screws. For example, three reference surfaces 30 (30a - 30c) which are mirror-finished vertically on the disk surface are equally formed for positioning when writing servo information at a side part of at least one ring member, for example 27. Thus a rotary center of a spindle 8 can be matched to that of the servo disk 25 highly accurately combining them in one body and hence enabling stability and reliability of a magnetic disk drive which incorporates it to be improved.

Description

[Detailed Description of the Invention] [Summary] Regarding a magnetic disk device, a disk used in the device, and a method for incorporating the same, an object of the present invention is to provide a disk with excellent stability and reliability, and a magnetic disk device in which the same can be incorporated. , a disk that can be incorporated into a magnetic disk device,
It is configured to have a reference portion that can define the rotation center position for writing servo information.

[Industrial application field]

The present invention relates to a magnetic disk device in which a servo disk for writing servo information can be incorporated, a disk that can be used in the device, and a method for incorporating the same.

[Conventional technology]

Conventionally, in a magnetic disk device, servo information is written onto the disk by the device itself after mechanical assembly. That is, a disk is mounted on the spindle of the device, and servo information is written on the disk by rotating it around the spindle.

[Problem to be solved by the invention]

However, due to the nature of the product, writing servo information, which is extremely important for servo control, in a magnetic disk device having a relatively delicate structure is not desirable in terms of its quality.

Therefore, it is an object of the present invention to solve the problem from a different perspective and to provide a magnetic disk device, a disk, etc. that is excellent in stability, reliability, etc. and is free from the disadvantages of the conventional ones.

[Means to solve the problem]

In order to solve the above problems, a disk according to the present invention is a disk that can be incorporated into a magnetic disk device, and has a structural feature that it has a reference part that can define a rotation center position for writing servo information. do.

[For production]

Since the disk is provided with a reference portion that can define the rotational center position, the accuracy of trial recording is significantly improved by writing servo information based on this reference portion.

[Examples] Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing the inside of a magnetic disk device according to an embodiment of the present invention, and FIG.
■It is a side sectional view taken from the direction of the arrow along the line.

The magnetic disk device 1 will be briefly explained based on these figures. The magnetic disk device 1 basically consists of a disk drive section 2 and a front/backward drive section 3.

The disk drive unit 2 includes a plurality of disc-shaped disks 5,
These spindles 8 are mounted at equal intervals with a spacing ring 6 in between and are rotatably supported on upper and lower sides of a housing 7 by bearings, and a motor 9 that rotationally drives the spindles 8.

The disks 5 and spacing rings 6, which are alternately stacked on the spindle 8, are pressed in the spindle axial direction by a pressure ring 11 screwed to one end of the spindle 8 (the upper side in the figure) so that they can freely rotate together with the spindle 8. connected.

The head drive section 3 includes a plurality of heads 14 for recording and reproducing.
, a plurality of arms 15 having a head 14 at the tip and positioning it on each disk surface, and an arm 1 with the head 14 as the center.
5 (head 14) so that it can rotate, and a motor section (VCM) 17 for rotating the head 14 located on the opposite side of the head 14 with the shaft 16 in between.

Incidentally, in FIG. 2, a servo disk 25 on which servo information is recorded is located at the center between the disks 5, and its structure will be briefly explained with reference to FIGS. 3 and 4.

The servo disk 25 has a structure in which a donut-shaped disk 26 is concentrically sandwiched between ring members 27 and 28 from both sides and collinearly aligned with screws. On the side of at least one ring member (for example, 27), there are, for example, three reference surfaces 30 (3
0a, 30b, 30c) are formed evenly along the positioning t when writing servo information, which will be described later.

Servo information is recorded on the servo disk 25 as a single unit, in other words, before it is incorporated into a magnetic disk device. An example of the process will be briefly described with reference to FIG. 5.

In the figure, 51 is servo information writing (hereinafter referred to as 5T
This is a closed-loop device (hereinafter referred to as STW device) that enables minute position control of the disk in addition to W). This ST
The W device 51 includes an air spindle 53 (only a portion is shown) that has high rotational precision and is built into its base 52.
When setting the servo disk 25 on which servo information is to be recorded on the stepped base 53a of the air spindle 53, the stepped base 53a of the air spindle 53 is set.
An air clamp 55 (
(when the servo disk 25 is removed, it can be moved toward the center), a laser displacement meter 57, and a servo writer 59 equipped with a head for recording servo tracks on the disk surface.
, and a chucking robot 61 (using a hydraulic or piezoelectric actuator or the like) for transporting and positioning the servo disk 25.

In such an STW device 51, the servo disk 25 placed on the stepped base 53a of the air spindle 53 by the chucking robot 61 is first placed on the ring member 27 by the laser displacement meter 57.
The center of rotation determined from the three reference planes 30a, 30b, and 30c is set so that the center of rotation of the air spindle 53 coincides with the center of rotation.

The servo disk 25 is rotated accurately, and a servo writer 59 records a predetermined servo track on the disk surface.

Since the STW can be performed in a rotationally supported state with extremely high accuracy, the recording accuracy of this servo disk and the performance of the magnetic disk device incorporating this servo disk can be dramatically improved.

Next, a technique for incorporating this servo disk, which has undergone STW on its own, into a magnetic disk device will be described below.

In this embodiment, the servo disk is not immediately assembled into a magnetic disk, but after the servo disk is attached to a spindle to form a spindle assembly, this is assembled into a magnetic disk device.

That is, referring to FIG. 6, 71 is a spindle assembly forming device, and this device 71
It has a structure that allows it to rotate and support with high precision with bearings attached above and below it, and includes a laser displacement meter 73, a chucking robot 75 for transporting and positioning the servo disk 25, and a disk 5.25. It has an automatic screw tightening device (not shown) for fastening the fixing suppression ring to the spindle 8.

In such a spindle assembly forming apparatus,
A reference surface (not particularly shown) similar to the reference surface 30 of the servo disk 25 is formed on the side surface of the stepped large diameter portion at the lower end of the reservation spindle 8, and the laser displacement meter 73 measures the spindle 8 using this as a reference. Find the center of rotation.

Then, the servo disk 25 gripped by the chucking robot 75 is controlled and positioned using the laser displacement meter 73 with reference to the reference surface 30 so that it coincides with the rotation center of the spindle 8, and the suppression ring 11 is attached to the automatic screw tightening device. By tightening the screws, a spindle assembly in which the disk 5 and the servo disk 25 are integrally connected is completed.

In this way, the rotation center of the spindle 8 and the servo disk 2
Since they can be integrally connected with the rotation centers of the magnetic disks 5 and 5 aligned with high precision, the stability and reliability of a magnetic disk device incorporating this can be significantly improved.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to record servo information on a disk with extremely high accuracy. Furthermore, the performance etc. of a magnetic disk device incorporating this can be dramatically improved.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a magnetic disk drive according to an embodiment of the present invention, Fig. 2 is a side sectional view taken along the line ■-■ in Fig. 1 in the direction of the arrow, and Fig. 3 is a plan view of a servo disk. , FIG. 4 is a side sectional view of the servo disk, FIG. 5 is an overall schematic side view of the servo information writing device, and FIG. 6 is an overall schematic side view of the spindle assembly forming device. 1... Magnetic disk device, 2... Disk drive unit,
3...Head drive unit, 5...Disk, 8...
・Spindle, 25... Servo disk, 26...
Disc, 27.28...Ring member, 3
0 (30a, 30b, 30c) = reference plane. Plan view system of the magnetic disk device of the embodiment 1 Box 1...Magnetic disk device 8...Spindle 2.
...Disk drive unit 14...Head 3...Hend drive unit 15...Arm 5...Disk 16...Shaft 7...Housing
17...Motor part (VCM) Side sectional view taken along line nn in FIG. 1 112 Port 1...Magnetic disk device 9...Motor 2...
Disk drive unit 11... Pressing ring 3... Head drive unit 14... Head 5... Disk 15... Arm 6... Spacing ring
16... Axis 7... Housing 17
...Motor section (VCM) 8...Spindle
25... Servo disk Plan view of servo disk Mr. Lu 3 Side sectional view of servo disk FIG. ) ・=71
- Overall schematic side view of vehicle surface servo information writing device No. 5
figure

Claims (1)

[Claims] 1. A disk (25) that can be incorporated into a magnetic disk device (1), characterized by having a reference part (30) that can define a rotation center position for writing servo information. disk. 2. A magnetic disk device incorporating a servo disk (25) in which servo information is written based on the disk reference portion (30) according to claim 1. 3. Connect the servo disk (25) to the magnetic disk device (1)
When the disc reference portion (30
) is a disc embedding method characterized by embedding based on