JPH02239484A - Holding mechanism for magnetic disk - Google Patents

Abstract

PURPOSE:To prevent a magnetic disk from being deformed and damaged by providing a flange to support the inner circumferential part of the magnetic disk in a lower direction and a spring means to press the upper surface of the magnetic disk in a ring-shaped member to be overlapped in multiple steps and to be inserted to a spindle. CONSTITUTION:In a ring-shaped member 20 to be overlapped in the vertically multiple steps and to be inserted into a spindle 6, a flange 21 is provided to support the inner circumferential part of a magnetic disk 10 in the lower direction and a spring means 22 is provided to press the upper surface of the magnetic disk 10. Each magnetic disk 10 is clamped by pressing force, which is generated by the deflection of the spring part 22. However, the clamp force is made enough to be more than force to generate friction force resisting against force caused by a product between quantity for one magnetic disk and acceleration to be applied to this disk or product between inertia moment and angular acceleration. Since the ring-shaped member 20 is made enough thick, the deformation caused by the clamp force is reduced. Thus, the deformation of the magnetic disk and the damage of the glass disk can be prevented.

Description

[Detailed Description of the Invention] [Summary] A magnetic disk holding mechanism that holds a plurality of magnetic disks of a magnetic disk device on a spindle at predetermined intervals, which enables high-precision assembly and prevents deformation or damage of the magnetic disks. In a magnetic disk holding mechanism in which a plurality of magnetic disks are stacked vertically in multiple stages at a predetermined interval and held by a spindle, each magnetic disk is supported and the magnetic disks are stacked vertically in multiple stages and inserted into the spindle. An annular member is provided for each magnetic disk, and the annular member includes:
It is configured to include a collar that supports the inner circumferential portion of the donut-shaped magnetic disk from below, and a spring means that presses the top surface of the magnetic disk.

[Industrial application field]

The present invention relates to a magnetic disk holding mechanism for holding a plurality of magnetic disks of a magnetic disk device on a spindle at predetermined intervals.

In recent years, the track pitch of magnetic disk drives has become narrower as the density has increased. For this reason, off-track due to thermal deformation or mechanical misalignment of the constituent members has become a major problem. On the other hand, in order to increase recording density, the flying height of the head, which is an electromagnetic transducer, is becoming lower.
Errors in the relative heights between the disks and the head arm and deformation of the disks in an out-of-plane direction during stacking impair this flying stability and cause a decrease in reliability.

Furthermore, when glass with enhanced magnetic properties, high surface strength, and good surface roughness is used for the disk substrate, it is necessary to avoid damage caused by clamping with excessive force.

[Conventional technology]

FIG. 9 shows a general magnetic disk holding mechanism in a conventional magnetic disk device. A fixed shaft 2 with a stator 1 of the motor is fixed at both ends to a housing base 3 and a housing force bar 4, and a cylindrical spindle hub 6 is connected to the fixed shaft 2 via bearings 5, 5'. is rotatably supported, and the rotor magnet 7 and rotor yoke 8 of the motor are mounted on the inner surface of the spindle hub 6.
A seat 9 for supporting a magnetic disk is formed at the lower part of the outer surface. and multiple magnetic disks 10
is inserted into the spindle hub 6 with the spacer 11 in between,
The top part thereof is fixed by tightening with a screw 13 via a clamper 12.

[Problem to be solved by the invention]

In the conventional magnetic disk holding mechanism described above, since the magnetic disks 10 and spacers 11 are stacked alternately, the thickness accuracy of each is a factor that determines the height accuracy of the magnetic disk. Since displacement in the vertical direction causes displacement of other magnetic disks, there is a problem in that even if the magnetic disk 10 and the spacer 11 are processed with high accuracy, sufficient assembly accuracy cannot be obtained.

In addition, since the clamping force of the magnetic disk stack held by the clamper 12 is large, the clamping force must be increased, which causes deformation of the magnetic disk 10 and seat 9, impairing the flying characteristics of the magnetic head, and especially In the case of disks, there were problems such as causing damage.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, it is an object of the present invention to provide a magnetic disk holding mechanism that can be assembled with high precision and can prevent deformation and damage of the magnetic disk.

[Means to solve the problem]

In order to achieve the above object, the magnetic disk holding mechanism of the present invention has a magnetic disk holding mechanism in which a plurality of magnetic disks 10 are stacked vertically in multiple stages at regular intervals and held by a spindle 6. An annular member 20 is provided for each magnetic disk, and the annular member 20 is stacked vertically and inserted into the spindle 6 in multiple stages, and the annular member 20 has a flange 21 that supports the donut-shaped inner circumference of the magnetic disk IO from below. and a spring hand 22 that presses the upper surface of the magnetic disk 10.

[For production]

By stacking a predetermined number of magnetic disks 10 supported on the collar 21 of the annular member 20 and then clamping the whole with the clamper 12, each magnetic disk 10 is clamped by the pressing force generated by the deflection of the spring portion 22. However, the clamping force only needs to be at least the force that generates a static friction force that opposes the product of the mass of a magnetic disk and the acceleration applied to this disk, or the product of the moment of inertia and angular acceleration. It is good to have less clamping force. Furthermore, since the annular member 20 is sufficiently thicker than the magnetic disk, deformation due to clamping force is small. These prevent deformation of the magnetic disk and breakage of the glass disk.

Furthermore, since the thickness accuracy of each magnetic disk 10 is not added to the disk height accuracy after assembly, highly accurate assembly is possible.

〔Example〕

FIG. 1 is a diagram showing a first embodiment of the present invention, (a)
is an assembled sectional view, and (b) is an enlarged view of part B in figure a.

On the right side of the figure, reference numeral 2 denotes a fixed shaft having a stator 1 of the motor, which is fixed at the top and bottom to a slotted housing base 3 and a housing force bar 4, and the fixed shaft 2 has a rotor magnet 7 and a rotor yoke of the motor. The fact that a cylindrical spindle hub 6 having a diameter of 8 is rotatably supported via bearings 5 and 5' is similar to the conventional example explained in FIG. This is because an annular member 20 is provided which supports the lO and is fitted into the spindle hub (hereinafter referred to as spindle) 6 in a stacked manner. As shown in FIG. 1(b), this annular member 20 includes a flange 21 that supports the inner peripheral part of the donut-shaped magnetic disk 10, and a flange 21 that supports the inner peripheral part of the donut-shaped magnetic disk 10, and a flange 21 that supports the magnetic disk supported by the annular member located below the annular member. Spring part (spring means) that presses the top surface
22 are provided. Each annular member 20 supports the magnetic disk 10 on its collar 21 as shown in FIG. 1(a).
As shown in the figure, the uppermost magnetic disk 10 that is fitted in multiple stages on the spindle 6 is pressed by the screw 13 via the clamper 12, so that the adjacent annular members come into contact with each other, and at the same time, the uppermost annular member The spring portion 22 presses and fixes the magnetic disk 20 supported by the lower annular member.

In this embodiment configured as described above, since the plate thickness accuracy of each magnetic disk 10 is not added to the disk height accuracy after assembly, highly accurate assembly is possible.

In addition, since the clamping force by the clamper 12 is sufficient to clamp one magnetic disk, it is less than the conventional force required to clamp all of a plurality of magnetic disks. Since the thickness can be made sufficiently thick compared to the above, deformation of the magnetic disk can be reduced, and deterioration of the flying characteristics of the magnetic head and damage to the glass disk can be prevented. Note that the spring portion 22 is the second
It may have a complete annular shape as shown in the figure, or it may have a plurality of slits 23 as shown in FIG. In this case, the spring portion 24 becomes easy to bend.

FIG. 4 is a diagram showing a second embodiment of the present invention.

On the right side of the figure, parts that are the same as those in FIG. 1 are designated by the same reference numerals.

This embodiment differs from the previous embodiment in that the upper and lower laminated surfaces 25 of the annular member 20 are formed into a conical shape, and the rest is the same as the previous embodiment.

In this embodiment configured in this way, the annular member 20 after assembly is
0 Positional deviation in the radial direction can be prevented. Other effects are the same as in the previous embodiment.

FIG. 5 is a diagram showing a third embodiment of the present invention, (a)
is an assembled cross-sectional view, (b) is a reduced cross-sectional view taken along line bb in figure a, and (C) is a reduced cross-sectional view taken along line CC in figure a. In the same figure, parts that are the same as those in the first embodiment are designated by the same reference numerals.

This embodiment differs from the first embodiment in that vertically adjacent annular members can be connected to each other with bolts. That is, each annular member 20 is provided with counterbore through holes 26 for bolt insertion and tapped holes 27 alternately on the same circumference (60 degree intervals in the figure), so that one of the vertically adjacent annular members 20 is replaced by the other. On the other hand, it is tightened and fixed with l-bitch (60 degrees in the figure) offset bolt 28.

The present embodiment configured in this manner not only has the same effects as the first embodiment, but also allows each magnetic disk to be securely fixed one by one.

FIG. 6 is a diagram showing a fourth embodiment of the present invention, (a)
is an assembled sectional view, (b) is a reduced sectional view taken along line bb in figure a, (C) is a reduced sectional view taken along line C-C in figure a, (
d) is a sectional view taken along line dd in figure a. In this figure, the same parts as in FIG. 1 are designated by the same reference numerals.

The difference between this embodiment and the previous embodiment is that, while in the previous embodiment, two annular members were connected by bolts, in this embodiment, three adjacent annular members were connected by bolts. Therefore, among the three annular members, the upper and lower annular members 20 are the same as in the previous embodiment, but the intermediate annular member 20 is provided with only a through hole 29 for inserting a bolt. This embodiment also provides the same effects as the previous embodiment.

FIG. 7 is a diagram showing a fifth embodiment of the present invention, (a)
FIG. 2 is an assembled cross-sectional view, and FIG. 7(b) is a perspective view showing the annular member excluding the spring means.

This embodiment differs from the first embodiment in that the annular member 2
0 is made into a separate member 30, one end of which holds the magnetic disk IO supported by the collar 2l, the other end is fixed with a screw 31, and the magnetic disk 10 is fixed by the spring force of the spring member 30. . According to this embodiment, effects similar to those of the first embodiment can be obtained.

FIG. 8 is a diagram showing a sixth embodiment of the present invention, (a)
FIG. 5 is an assembled cross-sectional view, and FIG. 7(b) is a perspective view showing the annular member excluding the spring means.

This embodiment differs from the previous embodiment in that the spring member 30 is lengthened and a convex portion 32 is provided at one end, and the magnetic disk 10 is attached to the other end.
By sandwiching the spring members and fixing them by tightening the screws 31 at the center, the same effect as in the previous embodiment is obtained, and the stability of tightening the spring member is improved.

〔Effect of the invention〕

As explained above, according to the present invention, since it is possible to clamp each magnetic disk without applying excessive force, deformation and damage such as warping of the magnetic disk can be prevented, and the annular member can be clamped with sufficient clamping force. Since it can be stacked, it is possible to reduce off-track due to misalignment after assembly, and since the plate thickness accuracy of each magnetic disk is not added to the disk height accuracy after assembly, high-precision assembly is possible, and the magnetic disk The reliability of the device can be improved.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention, FIG. 2 is a diagram showing an annular member of the first embodiment of the present invention, and FIG. 3 is a diagram showing another embodiment of the first embodiment of the present invention. FIG. 4 is a diagram showing a second embodiment of the present invention; FIG. 5 is a diagram showing a third embodiment of the present invention; FIG. 6 is a diagram showing a fourth embodiment of the present invention. 7 is a diagram showing a fifth embodiment of the present invention, FIG. 8 is a diagram showing a sixth embodiment of the present invention, and FIG. 9 is a diagram showing a conventional magnetic disk holding mechanism. It is. In the figure, 6 is a spindle, 10 is a magnetic disk, l2 is a clamper, 20 is an annular member, 2l is a collar, 22 is a spring portion (spring means), 23 is a slit, 26 is a bolt hole with a counterbore, 27 is a tap 28 is a bolt, 29 is a through hole, and 30 is a spring member.

Claims (1)

[Claims] 1. In a magnetic disk holding mechanism in which a plurality of magnetic disks (10) are stacked vertically in multiple stages at predetermined intervals and held by a spindle (6), each magnetic disk (10) is supported, An annular member (20) that is stacked vertically and inserted into the spindle (6) is provided for each magnetic disk. A holding mechanism for a magnetic disk, comprising a supporting collar (21) and a spring means (22) for pressing the upper surface of the magnetic disk (10).