JPS58133681A - Magnetic disc device - Google Patents

Abstract

PURPOSE:To attain a disc with high reliability in which exfoliation by a hub and a filter to a bonding surface is prevented, by pressing and fixing the filter constituting body on the hub with an elastic member, relating to a magnetic disc having a self-circulating type filter ststem. CONSTITUTION:A filter clamp 13 is touched to the filter 7 abutted to the outer side of a window 16 of the hub 1 to widen the pressing area and an elastic ring 14 is inserted to a guide groove 12 of the hub 1. In this state, the ring 14 touches with the clamp 13 and the groove 12 is projected. In the contacting the magnetic disc 5 with the hub 1, since a clamp ring 6 is fitted to the outer circumference of the ring 14, the outer diameter of the ring 14 is restricted with a small inner diameter of the clamp ring 6 and the ring 14 is contracted toward the inner side radially. As a result, the contracting force of the ring 14 pushes the filter clamp 13 into the body, allowing to press and fix the filter 7 to the hub 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic disk drive having a self-circulating filter system, and more particularly to a holding structure for the filter.

Magnetic disks that generally use a floating head slider
The gas (air) around the disk must be kept sufficiently clean.

Conventionally, air purification systems were equipped with air purification systems that pressurized outside air with a blower and passed it through a filter. It was really bad. A self-circulation filter system has been developed as a method to improve this and extend the life of the filter and improve the gas cleanliness.

FIG. 1 shows an example of a magnetic Guisf device using a conventional self-circulating filter system, and the structure and problems will be explained. Reference numeral 1 denotes a substantially cylindrical knob which is fixed to a shaft 2. The shaft 2 is supported by a bearing 3 and the knob 1 is rotated by being driven by a motor 4.The knob c5 is a magnetic disk. , are stacked alternately through clamp rings 6 that fit into the nozzles 1 and are assembled into the hub 1. A window of 16.16 m is opened on the side of the hub 1 and the clamp ring 6.
A filter I is attached to the outer peripheral surface of a window 16 of the hub 1. A is a sealed case in which the hub 1, magnetic disk 5, and other items are housed and isolated from the outside air. With this structure, when the magnetic disk 5 rotates, centrifugal force generates an air flow that moves from the center to the outer periphery, forming a gas circulation flow 9 as shown by the arrow. The dust is removed by

However, in the above conventional structure, the filter T is adhesively fixed to the outer periphery of the bubble 1 with an adhesive 10 as shown in @2, but the adhesive surface is damaged due to the passage resistance of the microvolume airflow and the centrifugal force due to rotation. It had the disadvantage that it peeled off and made it impossible to remove dust.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide a highly reliable magnetic disk drive that prevents peeling of the adhesive surface between a hub and a filter.

This objective can be achieved by pressing and fixing the filter structure against the hub with an elastic body. The present invention will be explained below with reference to the drawings.

3 and 4 relate to an embodiment of the present invention, in which FIG. 3 is an enlarged view showing a part of the hub, and FIG. 4 is a sectional view of the gas flow portion. In both figures, the outer periphery of the hub 1 is usually provided with protrusions 11 at least three locations on the circumference, which serve as radial standards when stacking the magnetic disks 5, and each protrusion 11 is provided with a clamp ring 6. A generally annular groove 12 is formed which corresponds to the position of the clamp ring and is narrower than the thickness of the clamp ring. This groove 12 serves as a guide for the elastic body 14 that presses the filter It. The elastic body 14 is a ring, and its outer diameter is larger than the inner diameter of the clamp ring 6, at least when it is guided in the guide groove 12. Then, the elastic ring 141 is fitted into the guide groove 12 of the hub 1 while the filter clamp 13 for increasing the pressing area is applied to the filter T which is brought into contact with the outside of the window 16 of the hub 1. In this state, the elastic ring 14 touches the filter clamp 13 and protrudes from the groove 12.

Therefore, when the magnetic disk 5t is attached to the hub 1, the clamp ring 6 fits on the outer periphery of the elastic ring 14, so the outer diameter of the elastic ring 14 must be restricted by the small inner diameter of the clamp ring 6. 14 is radially contracted to the same side. As a result, the contractile force of the elastic ring 14 pushes the filter clamp 13, thereby fixing the filter 7t against the hub 1. The pressing force in this case can be arbitrarily selected depending on the dimensional difference between the outer diameter of the elastic ring 14 and the inner diameter of the clamp ring 6. Note that the window 161 of the clamp ring 6 is positioned and sized so that it will not be blocked by the elastic ring 14.

By the way, depending on the type of the hub 1, the convex portion 11 on the outer periphery of the hub 1 may be
is too small to hold the elastic ring 14,
Alternatively, the convex portion may not exist. In these cases, it is difficult to provide the guide groove 12t of the elastic league 14 in the hub as shown in FIG. 3.4.

In such a case, by modifying the clamp ring 6, the same effect as the target embodiment can be obtained. This example is illustrated in FIG. ! The clamp ring 6 shown in FIG. 5 has a guide groove 15 with an annular step formed on its inner periphery. By making the diameter of this guide groove 15 smaller than the outer diameter of the elastic ring 14 and selecting the inner diameter of the elastic ring 14 so that its inner circumference contacts the filter clamp 13,
The configuration is substantially the same as that shown in FIGS. 3 and 4. for example,
When attaching the magnetic disk 5t to the hub 1, as shown in FIG.
By fitting into the guide groove 15 of the filter 6 shown in the figure, the elastic ring 14 is contracted and the filter clamp 1
3, the filter T is pressed and fixed. In this example as well, the window 16M of the clamp ring 6 is provided so as not to be blocked by the elastic ring 14.

Note that the filter clamp 13 is not necessarily required in any of the examples.

As described above, according to the present invention, since the filter receives the pressing force against the hub by the elastic deformation of the elastic ring, there is no chance of the adhesive surface between the filter and the hub peeling off. In addition, since the outer diameter of the elastic ring is regulated by the clamp ring, the filter can be pressed and fixed stably. Therefore, it is possible to actually damage a magnetic disk device whose sealed case is clean and highly reliable.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional view of a magnetic disk drive using a conventional self-circulating filter system, Fig. 2 is a cross-sectional view of the gas flow path portion of Fig. 1 viewed from above, and Fig. 3-4 is a partial cross-sectional view of a magnetic disk drive using a conventional self-circulating filter system. FIG. 3 is an enlarged view of a part of the hub according to the embodiment, FIG. 4 is a cross-sectional view of the gas flow path seen from above, and FIG. 5 is a part of the crank ring according to another embodiment of the present invention. This is a broken strabismus prisoner. In the drawing, 1 is a hub, 2 is a shaft, 3 is a bearing, 4 is a motor, and 5
is a magnetic disk, 6 clamp rings, 1 is a filter,
a is a closed case, 9 is a gas circulation flow, 11 is a convex part of the hub,
12 is a guide groove provided in the convex portion, 13 is a filter clamp,
14 is an elastic ring, 15 is a guide groove provided in the clamp ring, 16 is a window in the hub, and 16 & is a window in the clamp ring. Patent applicant: Nippon Telegraph and Telephone Public Corporation, patent attorney Shibu Mitsuishi (and one other person) Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] (11) A substantially cylindrical hub that engages with the inner periphery of a magnetic disk and holds the magnetic disk has a window on the side surface, and a filter that covers the vehicle crest window is disposed outside the window. 7i, in a magnetic disk drive configured such that a gas flow generated as the magnetic disk rotates passes through a 15t+ filter, the outer peripheral surface of the hub has convex portions in the circumferential direction, and the convex portions as a whole The filter is characterized in that an annular groove is provided, and the filter covering the window is suppressed and fixed by an elastic ring guided by the groove and a clamp ring that fits on the outer periphery of the elastic ring and contracts the elastic ring. Magnetic disk device. (2) A window is provided on the side surface of a cylindrical tube that engages with the inner periphery of the magnetic disk to hold the magnetic disk, and a filter that covers the window is placed on the outside of the window. In a magnetic disk device configured such that a gas flow generated as the magnetic disk rotates passes through the filter, an annular groove is provided on the inner periphery of the clamp ring that fits into the hole, and the gas flow is guided by the groove and compressed. 9. A magnetic disk drive characterized in that a filter covering the window is suppressed and fixed by an elastic ring and the clamp ring into which the elastic ring is fitted.