JPH0682501B2 - Method for assembling magnetic disk medium - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A method for mounting and assembling a magnetic disk medium and a spacer on the outer periphery of a spindle hub, which can be easily mounted without generating chips and which is misaligned between the magnetic disk medium and the spacer. The purpose is to make it possible to assemble a magnetic disk medium in a way that does not occur.When mounting magnetic disk media and spacers alternately on the outer circumference of the spindle hub, mount the outer circumference of the spindle hub on one side from the center beforehand. Providing multiple abutting protrusions in only half the area, insert the magnetic disk medium and spacers in a state of being displaced toward the abutting protrusions, and then the inner circumferences of the magnetic disk medium and spacer The magnetic disk medium and the spacer are tightened and fixed in a state where the magnetic disk medium and the spacer are moved and positioned until they hit the portion.

[Industrial application field]

The magnetic disk device has a structure in which magnetic disk media and spacers are alternately stacked and fixed on the outer periphery of a spindle hub. The present invention relates to a method of mounting and assembling a magnetic disk medium and a spacer on the outer circumference of a spindle hub.

[Conventional technology]

FIG. 5 is a sectional view of a magnetic disk medium mounting portion of the magnetic disk device. A hub 3 is fixed to an inner end of a spindle 2 which is inserted and supported in a casing 1 of the magnetic disk device, and a drive motor M is connected to an outer end thereof.

On the outer periphery of the spindle hub 3, magnetic disk media 5 and spacers 6 are alternately laminated on the lower end flange 4, and fixed on the hub 3 by a disk-shaped clamper 7.

The motor M drives the spindle 2 to rotate the magnetic disk media 5 at high speed, and the magnetic head 9 records / reproduces information.

By the way, in order to mount the magnetic disk medium 5 and the spacer 6 on the outer circumference of the hub 3, the magnetic disk medium 5 and the spacer 6 are separated from each other by 0.05 mm between the inner circumference of the magnetic disk medium 5 and the spacer 6 and the outer circumference of the hub 3.
There is a minute gap of about mm.

[Problems to be Solved by the Invention]

This gap is necessary for assembling the magnetic disk medium and the spacer. If it is too small, it becomes difficult to insert the magnetic disk medium and the spacer into the outer periphery of the hub 3. The core misalignment becomes large, and the dynamic balance of the magnetic disk medium during rotation is lost.

Therefore, this gap is made as small as possible. As a result, when inserting the magnetic disk medium and the spacer into the outer periphery of the hub 3, as shown in FIG. 6, the inner peripheral edges 5a and 6a of the magnetic disk medium and the spacer are formed. Then, the outer peripheral surface of the hub 3 is rubbed and chips 10 are generated. The chips 10 are accumulated on the magnetic disk medium 5, affecting the floating of the magnetic head 9 and causing a head crash or the like.

In particular, since a soft material such as aluminum is used as the material of the hub 3 for weight reduction, chips are easily generated.

To solve this problem, the clearance between the magnetic disk medium and the spacer and the hub 3 should be increased so that they do not come into contact with each other during insertion. However, as mentioned above,
The dynamic balance is lost, which causes problems such as spindle vibration and bearing life deterioration.

The technical problem of the present invention is to solve such a problem when assembling a magnetic disk medium and prevent chips from being generated.
Another object of the present invention is to make it possible to assemble a magnetic disk medium by a method that can be easily mounted and that does not cause misalignment between the magnetic disk medium and the spacer.

[Means for Solving the Problems]

FIG. 1 is a diagram for explaining the basic principle of a method for assembling a magnetic disk medium according to the present invention. Reference numeral 3 is a spindle hub, and a plurality of abutting projections 11 are provided on the outer circumference of the spindle hub only on one half AA from the center.

Then, as indicated by the broken line, the magnetic disk medium 5 and the spacer are inserted into the spindle hub 3 in a state of being displaced toward the abutting convex portion 11 side.

After the insertion, the magnetic disk medium 5 and the spacer are moved and positioned until the inner peripheries of the spacer hit the bumps 11,
The state is shown by the solid line. In this state, the magnetic disk medium 5 and the spacer are tightened and fixed to the spindle hub 3.

[Action]

In the state where the magnetic disk medium and the spacer are assembled and fixed to the hub 3 of the spindle, the inner circumference of the magnetic disk medium and the spacer hits the abutting projection 11 of the hub 3, but the magnetic disk medium and the spacer are fixed to the hub 3.
The magnetic disk medium and the spacer are displaced toward the abutting protrusion 11 side as shown by the broken line so that the magnetic disk medium and the spacer do not hit the abutting protrusion 11 and other parts of the hub 3 as shown in FIG. Then insert it. Then, after the insertion, the magnetic disk medium and the spacer are moved until they come into contact with the bumps 11 and are fixed by tightening. Only in this fixed state, the centers of the magnetic disk medium and the spacer coincide with the center of the hub 3, so that the magnetic disk medium and the spacer can rotate smoothly and stably without misalignment.

In this way, since the magnetic disk medium and the spacer are inserted while being slid toward the abutting convex portion 11 side of the hub 3 so as not to hit the outer periphery of the hub 3 and the abutting convex portion 11, the chips may be generated. There is no. Further, since the magnetic disk medium and the spacer can be accurately and easily positioned so that the center of the magnetic disk medium and the spacer coincide with the center of the hub 3 only by moving the magnetic disk medium and the spacer until they hit the abutting convex portion 11, there is no misalignment. I have no fear.

〔Example〕

Next, practical examples of how the method for assembling a magnetic disk medium according to the present invention is embodied will be described. Second
The drawing is a plan view showing an embodiment of the method of the present invention. In the illustrated example, in the area A-A of the one-half half from the center of the hub 3,
Two abutting protrusions 11, 11 are provided on the outer circumference of the hub 3. Therefore, the other half area B from the center of the hub 3
In -B, a large gap G having the same size as the height of the abutting protrusion 11 is formed between the inner peripheral edge of the magnetic disk medium and the spacer and the outer periphery of the hub 3. Therefore, when the magnetic disk medium and the spacer are inserted into the hub 3, the magnetic disk medium and the spacer are eccentrically inserted into the hub 3 by about half of the gap G as shown by the broken line. The medium and the spacer can be easily inserted without contacting the hub 3 side.

In the illustrated embodiment, the angle θ between the two abutting convex portions 11 and 11 is 120 °, but a free angle can be set within the range of 90 to 150 °. The smaller the angle θ, the greater the amount of movement of the magnetic disk medium and the spacer,
Easy to insert.

After the insertion, the magnetic disk media and the spacers are moved until they abut against the convex portions 11 to be positioned and then fixed by tightening, so there is no problem of misalignment.

However, if the magnetic disk medium and the spacer are simply abutted against the abutting protrusions 11, 11, the shape of the hub 3 is asymmetric and the dynamic balance is lost. In order to eliminate this, as shown in FIG. 3, in the area BB on the other half from the center of the hub 3, the counter eight 12 can be pierced so that the center of gravity coincides with the center C of the hub 3. Has been corrected to.

In place of the counter eight 12, as shown in FIG. 4, a position on the side opposite to the position where the counter eight is to be attached, that is, the area AA on the side of the abutting protrusion 11 for reducing the weight is used. You may provide the recess 13 for taking.

As described above, according to the present invention, when the magnetic disk medium and the spacer are inserted into the hub 3 of the spindle, the positions of the magnetic disk medium and the spacer are shifted so as not to contact the hub 3 side, and the insertion is performed. After that, it is moved and positioned until it comes into contact with the abutting convex portion, and then tightened and fixed. Therefore, the flying stability of the magnetic head is not hindered, and chips that hinder recording / reproduction are not generated. Further, by increasing the height of the abutting protrusion 11, the workability of inserting the magnetic disk medium and the spacer is also improved.

[Brief description of drawings]

FIG. 1 is a plan view illustrating the basic principle of a method for assembling a magnetic disk medium according to the present invention, FIG. 2 is a plan view showing an embodiment of the present invention, and FIGS. 3 and 4 are balance means of a spindle hub. FIG. 5 is a plan view and a cross-sectional view showing an embodiment, FIG. 5 is a cross-sectional view showing a magnetic disk medium mounting portion in a magnetic disk device, and FIG. 6 is a cross-sectional view showing points where chips are generated when the magnetic disk medium is assembled. In the figure, 2 is a spindle, 3 is a spindle hub,
Reference numeral 4 is a flange, 5 is a magnetic disk medium, 6 is a spacer, 7 is a clamper, 9 is a magnetic head, 10 is a chip, 11 is an abutting convex portion, 12 is a counter eight, and 13 is a concave portion for meat removal, respectively.

Claims (1)

[Claims] 1. When mounting a magnetic disk medium (5) and a spacer alternately on the outer circumference of a spindle hub (3), a half area on one side from the center of the outer circumference of the spindle hub (3) in advance ( Only a plurality of abutting protrusions (11) are provided only in (A), and the magnetic disk medium (5) and the spacer are inserted in the abutting protrusions (11) side while being displaced, and then the magnetic disk medium ( 5) A method for assembling a magnetic disk medium, characterized in that the magnetic disk medium (5) and the spacer are clamped and fixed in a state where the inner circumferences of the spacer and the spacer are moved and positioned until they abut against the bumps (11).