JPS61208690A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To provide for more intensive air circulation within a casing by forming an air passage by an outer hub wall, a recess formed on an aperture for hub mounting on a magnetic disk, a recess formed on the inner periphery of a spacer ring and an air port formed on one of the hub and a disk stopper plate. CONSTITUTION:A positioning part 11 and a recess 12 are formed in the aperture mounting the magnetic disk 3 to the hub 6. The air passage 10 is defined between the recess 12 and the hub 6. The air port 9 passing completely from the inner periphery to the outer periphery is provided in the recess 14 of the spacer ring 14. An air channel is sufficiently procured by the recess 12 on the disk 3 and the recess 14 of the spacer ring 5. An air is introduced from both the air ports 7 of the disk stopper plate 4 and the air port 8 of the hub 6 and discharged from the air port 9 of the spacer ring 5. In such a manner, air circulation is sufficiently executed within the casing 1 to make the temperature in the casing 1 uniform.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a magnetic disk drive, and more particularly to a magnetic disk drive that allows air circulation between magnetic disks within a sealed device.

[Technical background of the invention and its problems]

Generally, information is magnetically recorded on a magnetic disk with a minute track width of several tens of microns. For this reason, if a temperature difference occurs in a local part of the magnetic disk due to stagnation of airflow during recording and reproduction in a magnetic disk device, the magnetic disk will be distorted due to non-uniform thermal deformation. ``This distortion causes a relative positional shift between the magnetic disk and the magnetic head, which may impede information recording and reproduction. This is called thermal off-track.

A magnetic disk drive that circulates airflow has been used to prevent thermal off-track, and this is shown in FIG. In FIG. 10, the spindle 32
Air is drawn in through a ventilation hole 37 provided on the upper part of the disk stopper plate 34 at the top of the disk and a ventilation hole 38 between the lower part of the hub 36 and the spindle 32, and a spacer ring 35ζ that partitions between the magnetic disks 33 is used. By blowing out air through the pores 39, air stagnation is eliminated and the temperature inside the case 31 is made uniform.

However, in recent years, with the trend toward higher density recording, devices have become more compact, and the diameter of the hub 36 has become smaller, making it difficult to provide ventilation holes 37, 38 and ventilation passages 40 for air circulation. circulation is becoming impossible.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a magnetic disk device that allows sufficient air circulation within the case even when the device is reduced in V and the diameter of the hub is reduced. .

[Summary of the invention]

In order to achieve the above object, the present invention provides a magnetic disk device in which a plurality of magnetic disks are attached to a hub via a spacer ring and driven to rotate, and an air passage is formed between the outer wall of the hub and the hub of the magnetic disk. Attachment was made to a notch provided in the hole, a notch provided on the inner peripheral side of the spacer ring, and at least one of the hub or the disc stopper plate. A magnetic disk device characterized in that the spacer ring is formed with a ventilation hole through which circulating air flows in, and a ventilation hole through which air from the ventilation path flows out between the surfaces of the magnetic disks is provided in a notch of the spacer ring. I will provide a.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the configuration and air circulation of a magnetic disk device according to the present invention. In FIG. 1, when a plurality of magnetic disks 3 (four in this case) attached to a hub 6 fixed to a spindle 2 rotate, the air between the magnetic disks 3 is moved by centrifugal force, Flows toward the outer circumference. For this reason, air flows into the ventilation path 10 between the spacer ring 5 and the hub 6 through the ventilation hole 7 or 8 provided at the lower part of the disc stopper plate 4 or the hub 6, and the air flows into the ventilation path 10 between the spacer ring 5 and the hub 6. It flows out from the ventilation hole 9. At this time, the ventilation hole is located between the disc stopper plate 4 and the hub 6.
By providing both at the lower part of the , the amount of air flowing in can be increased. FIG. 1 shows a case in which they are provided on both sides.

2 and 3 show the structure of the magnetic disk 3 and spacer ring 5 in the magnetic disk device ζ according to the present invention.

In FIG. 2, a positioning portion 11 and a cutout portion 12 are formed in a hole for attaching the magnetic disk 3 to the hub 6. The positioning portion '11 abuts against the hub 6 to position the magnetic disk 3, and the notch 12 forms an air passage 10 (shown in FIG. 1) between the notch and the hub 6.

In FIG. 3, the spacer ring 5 is also formed with a positioning part 13 and a cutout part 14 on the inner circumference side which abuts against the hub 6 for positioning, and the cutout part 14 is penetrated from the inner circumference side to the outer circumference side. A ventilation hole 9 is provided. The positioning portion 13 and the notch 14 perform the same function as the positioning portion 11 and the notch 12 of the magnetic disk 3.

FIG. 384 shows the procedure for attaching the magnetic disk 3 and spacer ring 5 to the hub 6. Place the ventilation passage 10 (shown in FIG. 1) on the hub 6 provided with the ventilation hole 8 by aligning the notch 12 of the magnetic disk 3 and the notch 14 of the spacer ring 5 with the position of the ventilation hole 8. They are layered as they are formed. At this time, the magnetic disk 3 and the spacer ring 5 are stacked in this order, and finally the disk stopper plate 4 is placed on the magnetic disk 3 and fixed to the hub 6 with screws 15. However, the ventilation hole 7 provided in the disk stopper plate 4 should be aligned with the notch 12 of the magnetic disk 3.

In the magnetic disk drive configured as described above, no matter how small the diameter of the hub 6 becomes, a sufficient air passage can be secured between the notch 12 of the magnetic disk 3 and the notch 14 of the spacer ring 5, and the disk can be stopped easily. Air flows in from both the ventilation hole 7 of the plate 4 and the ventilation hole 80 of the hub 6, and flows out from the ventilation hole 9 of the spacer ring 5, allowing sufficient air circulation inside the case 1, so that the temperature inside the case 1 decreases. can be kept uniform. As a result, stable recording and reproduction can be performed without causing thermal off-track.

FIG. 5 shows a modification of the spacer ring 5. The spacer ring 5 shown in FIG. 5 has a large proportion of the notch 17 that forms an air passage with the outer wall of the hub 6, and a small proportion of the positioning part 16 that performs positioning. At the same time, the magnetic disk 3 also has a notch 19 as shown in FIG.
The ratio of the positioning portion 18 is increased, and the ratio of the positioning portion 18 is decreased.

With this shape, a sufficient air passage can be secured, and the number of ventilation holes 9 can also be selected arbitrarily.
The flow rate of air flowing out between the magnetic disks can be controlled as necessary.

[Other embodiments of the invention]

7, 8 and 9 show other embodiments of the invention. In Figure M8, a dust removal filter 22 is attached to the notch 14 of the spacer ring 5. In FIG. 9, a moisture absorption filter 23 containing a moisture absorption agent such as silica gel is attached to overlap the dust removal filter 22.

By installing these filters 22, 23, air flowing in from the vents 7 and 8 as shown in FIG.

In a magnetic disk drive that is configured to allow sufficient air circulation within the sealed case 1, the filter can efficiently remove dust and absorb moisture without causing a head crash, which greatly improves the stable flying of the head. Award for effective effects.

〔Effect of the invention〕

As described in detail above, according to the present invention, the device can
Even if the diameter of the hub becomes smaller, the required ventilation path can be secured by providing a hole in the outer wall of the hub, a hole in the hub mounting of the magnetic disk, and a notch on the inner circumference of the spacer ring, ensuring that the air inside the case is kept small. Circulation becomes insufficient.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an embodiment of a magnetic disk device of the present invention, FIG. 2 is a perspective view showing an assembly procedure of a magnetic disk and a spacer ring according to the present invention, and FIG. 5 is a diagram showing a spacer ring according to the present invention. A plan view showing a modified example of the ring, FIG.
Seventh plan view showing a modified example of the magnetic disk according to the present invention.
8 and 9 are a plan view and a cross-sectional view of a spacer ring in another embodiment of the present invention, and FIG. 10 is a block diagram of another embodiment of the magnetic disk device of the present invention. , is a configuration diagram of a conventional magnetic disk device. 1... Case 4... Disc stopper plate 5.
...Spacer ring 6...Hub 7...Vent hole
8...Vent hole 9...Vent hole 10...
・Air passage 11...Positioning part 12...Notch part 1
3...Positioning part 14...Notch part Agent Patent attorney Noriyuki Chika (and 1 other person) Fig. 1 Fig. 2 Fig. 8 Fig. 6 Fig. 6 Fig. 7

Claims (3)

[Claims] (1) In a magnetic disk drive in which a plurality of magnetic disks are attached to a hub via a spacer ring and driven to rotate, an air passage is formed in the outer wall of the hub and a notch provided in the hub attachment hole of the magnetic disk. and a notch provided on the inner peripheral side of the spacer ring, and a vent hole provided in at least one of the hub or the disc stopper plate through which air flows, and the notch of the spacer ring includes: A magnetic disk drive characterized in that a ventilation hole is provided through which air flows out from the ventilation path. (2) Claim 1, characterized in that a filter for removing dust is attached to the notch of the spacer ring.
Magnetic disk device described in section. (3) A magnetic disk drive according to claim 1 or 2, characterized in that a moisture absorption filter is attached to the notch of the spacer ring.