JPS6239509B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to, for example, a sealed magnetic disk device having a spindle to which a plurality of magnetic disks are fixed, and in particular to a means for reducing the temperature difference between the plurality of magnetic disks as much as possible. be.

In conventional sealed magnetic disk devices, especially those with a high density of data in the radial direction of the magnetic disk, track following is performed by the servo surface of the magnetic disk and the servo head.
That is, the servo head automatically tracks the commanded track position), and the data head is positioned on the target data track of the magnetic disk.
At this time, servo disk (magnetic disk with servo surface)
If a temperature difference occurs between the data head and the data disk (the magnetic disk having the target data track), the data head will be displaced from the target data track, making it impossible to read or write data.

Generally, in a magnetic disk device that has multiple magnetic disks that introduce outside air as a pair, a blower is used to forcibly blow air almost equally between each magnetic disk through an air filter, creating a temperature difference between each magnetic disk. I try not to.

However, in a sealed magnetic disk device, since air is circulated internally, the air flow tends to be uneven within the device, and a temperature difference between the servo disk and the data disk tends to occur.

The object of the present invention is to provide a closed type magnetic disk device that blows the same amount of air onto each magnetic disk and does not cause a temperature difference between the magnetic disks even if it is a closed type.

FIG. 1 is a partially sectional side view showing an embodiment of the present invention. 1 is a spindle supported by an upper bearing 2 and a lower bearing 3; 4 is a housing that holds the two bearings 2 and 3; 5 is a rotor that rotates with respect to a stator 6 attached to this housing. , 7 is a hub fixed to the upper end surface of the spindle 1 by press fitting, etc.;
1 is a plurality of magnetic discs attached to the hub and kept at a distance from each other by spacers 9; 10 is a disc holder for pressing the magnetic discs; 11 is the magnetic disc 8 of the hub 7; A plurality of spiral grooves are cut in the surface on which the spindle 1 is mounted, 12 is a hole through which air is blown out from the spiral groove, 13 is a flow of air from this hole, and 14 is the center of the spindle 1. It is a line.

FIG. 2 shows the magnetic disk 8,
FIG. 2 is a partially sectional side view with a spacer 9 and a disk retainer 10 removed. 1-7, 11-14 in the figure
1 indicates the same parts as the same reference numerals in FIG.

FIG. 3 is a perspective view of the spacer 9 in FIG. 1,
Reference numeral 12 indicates the same parts as the same reference numerals in FIG.

In the sealed magnetic disk device constructed as described above, the spindle 1 is rotated counterclockwise when viewed from above in FIG. 1 by a motor comprising a stator 6 and a rotor 5. This rotation causes the hub 7 to
The grooves 11 cut in a spiral shape on the side surface create a flow of air from top to bottom. In this case, the air intake port is a hole made in the disc retainer 10, but it is omitted in FIG. Air flows from groove 11 to spacer 9
Air flows 13 through the upper hole 12 and flows out while uniformly cooling the magnetic disks 8 as shown by the arrows, so that each magnetic disk 8 is equally cooled. In addition,
A large number of holes 12 are drilled in each spacer 9 such that at least one hole 12 in each spacer 9 directly faces the groove 11 .

In the above embodiment, the air flow 13 flows from the top of the hub 7 to the bottom and flows out between the magnetic disks 8, but if the air flow is to flow from the bottom to the top in the opposite direction, it can be cut to the hub 7. The direction of the groove 11 may be reversed to that shown in FIG.

As explained above, this invention has a simple structure in which a spiral groove is cut in the magnetic disk mounting surface of the hub and an air outlet from this groove is provided between the magnetic disks to distribute air equally to each magnetic disk. This has the effect of not creating a temperature difference between the blown magnetic disks.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view showing an embodiment of the present invention, Fig. 2 is a partially sectional side view of the device shown in Fig. 1 with the magnetic disk, spacer and disk retainer removed, and Fig. FIG. 2 is a perspective view of the disk retainer of the device of FIG. 1; In the figure, 1 is a spindle, 7 is a hub, 8 is a magnetic disk, 9 is a spacer, 1 is a spiral groove, 12
13 is a hole made in the spacer, and 13 is an air flow. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A hub fixed to a spindle for mounting a plurality of magnetic discs, one or more spiral grooves cut on the surface of the hub to which the magnetic discs are mounted, and a hub for mounting a plurality of magnetic discs. a plurality of spacers each inserted between two adjacent magnetic disks to maintain a mutual spacing between the magnetic disks, and fixed to the hub together with the plurality of magnetic disks; A sealed magnetic disk device comprising a plurality of holes formed in each spacer, and an air outlet for blowing air onto the magnetic disk through the spiral groove.