JPH03183057A - Fixing structure for magnetic disk - Google Patents

Abstract

PURPOSE:To uniform pressure over the whole periphery of a disk and to prevent abrasion particles from being generated as well by overlapping two rings for which one ring is equipped with elasticity at least, pressing the disk by one ring and fitting the other ring to a shaft part to prevent the disk side ring from dropping off. CONSTITUTION:The two rings are used while being overlapped, and the outer peripheral part of a ring Rd on a disk 5 side is abutted on the disk 5 and presses the disk 5. By a pressing ring Rp fitted to a fitting shaft part 11, while preventing the ring Rd from being released or dropped off, the disk 5 is pressed and fixed. Since the elasticity is provided on one of the two rings at least, even when the pressure of the disk 5 is made ununiform on a certain place, this imbalance is absorbed and distributed by the elasticity. Concretely, the elasticity is provided for the ring Rd, the outer peripheral part 12 is protruded to the disk 5 side and only this projecting part 12 is abutted on the disk 5. The ring Rp is composed of a rigid body and in the inner peripheral part, a projection 15 is provided to be inserted to an axial direction groove 14 and a peripheral direction ring-shaped groove 13.

Description

[Detailed Description of the Invention] [Summary] Regarding the structure of fixing a disk to a spindle hub in a magnetic disk device, it is important to determine whether or not the central axis rotates when fixing the disk, which is an information recording medium, to the spindle hub. With the aim of realizing a fixing structure that does not affect the disk side and does not have any adverse effects such as distortion on the disk side, the mounting shaft protrudes from the center of the top end of the spindle hub that is rotationally driven by the motor. A disk-side ring that contacts the disk and a presser ring that prevents the disk-side ring from falling off are mounted on the outer periphery of the disk, and the presser ring is supported by the mounting shaft, and the disk-side ring The structure is characterized in that the outer peripheral portion is shaped so as to abut only on the disk, and at least one of the disk-side ring and the holding ring has a spring property.

[Industrial application field]

The present invention relates to a structure for fixing a disk (magnetic recording medium) to a spindle hub in a magnetic disk device.

[Prior Art] FIG. 6 is a plan view and a longitudinal sectional view showing a disk fixing structure in a conventional magnetic disk device.

Device! (7) A spindle hub 3 is fixed to the central shaft 2 of the motor M fixed to the frame 1.

On the flange 4 of this spindle hub 3, a disk (
A disc-shaped clamper 7 is screwed onto the upper surface of the spindle hub 3, with magnetic recording media 5 and spacing rings 6 alternately stacked on top of each other.

The outer circumferential edge 8 of the clamper 7 protrudes toward the disk 5 so as to contact only the disk 5 without contacting the spindle hub 3. The clamper 7 is usually fixed to the spindle hub 3 with three or more setscrews 9.

In such a structure, it is difficult to uniformly tighten each set screw 9, so it is difficult to press the entire circumference of the clamper 7 against the disk 5 with an even force, and as a result, the disk 5 may be deformed. There are problems such as distortion and distortion.

On the other hand, as shown in FIG. 7, it is also possible to fix the clamper 7 with one set screw 10 provided at the center thereof. In this case, as long as the clamper 7 and the set screw 10 are finished with high precision, the tightening force by the set screw 10 will be relatively uniform, and the unbalanced tightening force will cause deformation or distortion of the disk 5. Such problems are largely avoidable.

[Problem to be Solved by the Invention] However, this fixed structure is applicable only to a structure in which the central shaft 2 of the spindle hub 3 rotates together with the spindle hub 3, and is not applicable to a structure in which the central shaft 2 is fixed. It's impossible. That is, the central shaft 2 is press-fitted into the flange of the motor, and only the spindle hub 3 is
It is fixed to the motor rotor and is located outside the central shaft 2.
It has a structure in which a spindle hub 3 and a disk 5 rotate.

In this structure, the clamper 7 cannot be fixed to the central shaft 2, so it must be fixed to the spindle hub 3 with a plurality of setscrews 9, as shown in FIG.

In addition, the clamper 7 has a fixed structure in both FIGS.
Since the clamper 7 directly presses down the uppermost disk 5, there is also the problem that effects such as distortion caused by the clamper 7 are directly transmitted to the disk 5.

The technical problem of the present invention is to address such problems and to solve the problem when fixing a disk, which is an information recording medium, to a spindle hub, regardless of whether the central axis rotates or not. The objective is to realize a fixed structure that does not have any negative effects.

[Means to solve the problem]

FIG. 1 is a half-sectional view illustrating the basic principle of a magnetic disk fixing structure according to the present invention. Reference numeral 3 designates a spindle hub, and a mounting shaft portion 11 is integrally formed protruding from the center of the top end of the spindle hub.

A disk side ring Rd is attached to the outer periphery of this mounting shaft portion 11.
, and a presser ring Rp that prevents the disk side ring Rd from falling off is mounted on top of the disk ring Rd, and the presser ring Rp is supported by the mounting shaft portion 11.

The disk-side ring Rd is shaped such that its outer peripheral portion 12 contacts only the disk 5.

Then, the disk side ring Rd and the holding ring R
At least one of p has spring properties.

[Effect]

In the case of the present invention, two rings are used in a stacked manner, and the outer peripheral portion 12 of the disk-side ring Rd contacts the disk 5 and presses the disk. A presser ring Rp attached to the mounting shaft portion 11 presses and fixes the disk-side ring Rd so that it does not loosen or fall off.

At least one of the disk side ring Rd and the presser ring Rp has a spring property, so if the pressing force of the disc 5 becomes uneven depending on the location, the unbalance of the pressing force can be absorbed by the spring property. distributed. the result,
Problems such as distortion or deformation of the disk 5 are eliminated.

〔Example〕

Next, examples will be used to explain how the magnetic disk fixing structure according to the present invention is actually implemented. FIG. 2 is an exploded perspective view showing a first embodiment of the disk fixing structure, and FIG. 3 is a sectional view of the same embodiment in an assembled state. M is a spindle motor, and a mounting shaft portion 11 is integrally formed protruding from the center of the top end of a spindle hub 3 thereof. In this embodiment, an annular groove 1 is formed on the outer peripheral surface of the mounting shaft portion 11.
3 is formed into which the projection 15 of the retainer ring Rp is inserted. In addition, the outer peripheral surface has a plurality of grooves 14 in the axial direction.
is formed.

In this embodiment, the disk side ring) ld has a spring property, and the outer peripheral portion 12 protrudes toward the disk 5 side in an arc shape, and only the protruding portion 12 comes into contact with the disk 5. .

The presser ring Rp is made of a rigid body, and has a protrusion 15 inserted into the axial groove 14 and the circumferential groove 13 on the inner circumference.
have. Note that the hole 16 is for rotating the retaining ring Rp.

In this structure, to assemble the disk 5, put the disk 5 on the flange 4 of the spindle hub 3, insert the disk side ring Rd from above the disk 5, and attach it to the outside of the mounting shaft 11. Arrange. Next, a presser ring Rp is inserted from above this disk-side ring RdO. At this time, the protrusion 15 of the presser ring Rp is
Insert the operating tool into the axial groove 14 on the outer periphery of the mounting shaft portion 11 and push it down to the annular groove 13 against the spring force of the disk side ring Rd. By turning the protrusion 15 , the protrusion 15 is rotated within the annular groove 13 and displaced from the axial groove 14 . In this state, the disc side ring Rd is connected to the disc 5 and the presser ring Rp.
The spring force holds the presser ring Rp between the
is pressed against the upper wall of the annular groove 13 to prevent it from falling off. Furthermore, the disk 5 is pressed and fixed toward the flange 4 by the spring force of the disk-side ring Rd.

Although this embodiment shows the case where there is only one disk 5, a case where a plurality of disks 5, etc. are mounted as shown in FIG. 6 can also be realized with the same structure.

Figure 4 shows the disk side ring Rd in Figures 2 and 3.
It is a perspective view seen from the disk 5 side. A plurality of sleeves l-18 .
・By opening, the spring force is adjusted.

FIG. 5 is a sectional view showing the second embodiment, in which the disk side ring Rd is not a rigid body, and the retaining ring Rp has spring properties. The outer circumferential portion 12 of the disk side ring Rd is also
The outer peripheral portion 19 of the retainer ring Rp also projects in an arc shape toward the disk 5 side. The attachment structure of the retainer ring Rp to the attachment shaft portion 11 is the same as in the first embodiment. In this way, the outer peripheral portion 12 of the disk-side ring Rd is pressed against the disk 5 by the spring force of the holding ring Rp.
The pressing force exerted on the disk 5 by the disk side ring Rd is uniform over the entire circumference, and there is no fear of deforming or distorting the disk 5.

Note that both the disk side ring Rd and the presser ring Rp may have spring properties.

A commercially available C-shaped retaining ring or nut can also be used as the retainer ring Rp.

〔Effect of the invention〕

As described above, according to the present invention, at least two rings are stacked one on top of the other, and one ring Rd serves as a presser for the disk 5. The other ring Rp is attached to the mounting shaft portion 11 to prevent the disk-side ring Rd from falling off, and at least one of the rings has spring properties.

Therefore, the uneven force that presses the disk 5 is absorbed and dispersed by the spring force, and the disk 5 is pressed and fixed with uniform force over the entire circumference, so problems such as distortion of the disk 5 are eliminated. . Since the unreasonable force is alleviated by the spring force, there is no fear that the contact surface between the disk side ring Rd and the disk 5 will be rubbed by unreasonable force and generate abrasion powder.

Also, the shaft portion 1 is attached to the center of the top end of the spindle hub 3.
1, and each ring is attached to the outer periphery of the mounting shaft 11, so it can be applied to a structure in which the central shaft rotates together with the spindle hub 3 or a structure in which it does not rotate, and the scope of application is not limited. .

[Brief explanation of drawings]

FIG. 1 is a half-sectional view illustrating the basic principle of the magnetic disk fixing structure according to the present invention, FIG. 2 is an exploded perspective view showing the first embodiment of the present invention, and FIG. 3 is an assembled state of the same embodiment. 4 is a perspective view of the disk-side ring, FIG. 5 is a sectional view showing a second embodiment of the present invention, and FIGS. 6 and 7 show a disk fixing structure in a conventional magnetic disk device. FIG. In the figure, M is a spindle motor, 2 is a central shaft, 3 is a spindle hub, 4 is a flange, 5... is a disk,
6 is a spacing ring, 7 is a clamper, 9, IO is a set screw,
11 is a mounting shaft portion, Rd is a disk side ring, Rρ is a holding ring, 12. Reference numeral 19 indicates an arc-shaped outer peripheral portion, 13 indicates an annular groove, 14 indicates an axial groove, and 15 indicates a protrusion.

Claims (1)

[Claims] A mounting shaft (11) is protruded from the center of the top end of a spindle hub (3) rotationally driven by a motor, and the outer periphery of this mounting shaft (11) is brought into contact with the disk (5). a disc side ring (Rd), and a disc side ring (Rd);
A presser ring (Rp) that prevents the mounting shaft portion (Rd) from falling off is mounted on top of the presser ring (Rp), and the presser ring (Rp) is mounted on the mounting shaft portion (Rd).
11), and the disk side ring (Rd) has a shape such that its outer peripheral portion contacts only the disk (5), and the disk side ring (Rd) and the retaining ring (Rp) are A fixing structure for a magnetic disk, characterized in that at least one side has spring properties.