JPH039196Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic disk device having a positioning mechanism having a servo head.

In a conventional magnetic disk device with a servo head mechanism, when a temperature difference occurs between the disk surface where the servo head is located and the disk surface where multiple data heads are located, the head positioning mechanism such as the disk arm Differences in the degree of thermal expansion of the components can result in off-track misalignment between tracks and heads on the same cylinder.

An object of the present invention is to provide a structure in which a servo head, a plurality of data heads, and arms are located in a place with as small a temperature difference as possible in a sealed magnetic disk device.

In a sealed magnetic disk device, since a plurality of disks generally rotate coaxially at high speed, heat is generated due to friction between air and the disk surface.
Since this amount of heat generation is proportional to the relative speed between the disk surface and the air surface, it is thought that the heat generation is greatest on the outer surface of the disk at both ends, which are located on the outermost side and widely facing the air between the housing and the disk. .

However, in reality, since the amount of heat dissipated from the housing surface is large, the temperature of the outer surfaces of the disks at both ends is lower than that of the plurality of inner disk surfaces.

On the other hand, on the inner disk surfaces, the distance between the disks is generally narrower, so the air between the disks rotates at almost the same speed as the disks, and the temperature distribution is almost uniform compared to the disk surfaces at both ends. Conceivable.

The servo mechanism in conventional magnetic disk drives usually uses the outermost disk surface as the servo surface, but this is not advantageous from the standpoint of disk temperature distribution for the reasons mentioned above. .

The present invention aims to solve the above-mentioned conventional problems, and the purpose is to provide at least a plurality of magnetic disks on which information is recorded layered at approximately equal intervals, and a plurality of magnetic disks on which the information is recorded. A sealed magnetic disk device that stores a plurality of magnetic heads arranged on each side of a plurality of magnetic disks in a housing and has a random access servo mechanism for positioning the magnetic heads with respect to tracks of the magnetic disks. A disk having approximately the same diameter as the magnetic disk that is not intended for recording information is placed on both outermost peripheries of the magnetic disk on which information is recorded and is laminated at approximately equal intervals. This is achieved by a sealed magnetic disk device characterized in that it is stacked with a magnetic disk so as to rotate together with the magnetic disk at intervals.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The figure is a simplified cross-sectional view of a sealed magnetic disk device according to the present invention, in which 1 is a spindle motor, 2 is a dummy disk that is not used for recording information, and 3 is a dummy disk that is not used for recording information.
4 is a carriage, 4 is an arm having a servo head, 5 is an arm having a data head, 6 is a disk necessary for recording information, and 7 is a housing made of aluminum or the like.

The dummy disk is made of an aluminum disk and does not have a magnetic thin film for magnetic recording, such as the disk 6.

In this disk device, dummy disks 2 are added to both sides of the disk 6 having a servo surface and a data surface at the same intervals as the disks 6, and are rotated at the same speed by the spindle motor 1 like the other disks 6. It is structured to allow As a result, the head and arm mechanism sections 4 and 5 involved in information recording are all located at approximately the same temperature distribution, which has the effect of preventing off-track due to thermal expansion. Although the figure shows a case in which the present invention is applied to a horizontally-oriented magnetic disk device, it is naturally applicable to a vertically-oriented magnetic disk device as well. Further, the number of magnetic disks in the figure is only shown as an example, and the number of magnetic disks is not limited to this number.

According to the present invention, by providing the dummy disk, the servo head and the plurality of data heads can be located in a place where the temperature difference is small.
This has the effect of reducing the degree of relative positional deviation between a plurality of tracks on the same cylinder and the head due to thermal expansion.

[Brief explanation of the drawing]

The figure is a sectional view of a sealed magnetic disk device according to the present invention. In the figure, 2 is a dummy disk, 4 is an arm having a servo head, 5 is an arm having a data head, and 6 is a disk necessary for recording information.

Claims (1)

[Claims for Utility Model Registration] A housing comprising a plurality of magnetic disks on which information is recorded layered at least approximately equal intervals, and a plurality of magnetic heads arranged on each surface of the plurality of magnetic disks on which the information is recorded. A sealed magnetic disk device having a random access servo mechanism for positioning the magnetic head with respect to the track of the magnetic disk, which is approximately the same as the above magnetic disk and is not intended for recording information. disks having the same diameter are provided on both outermost peripheries of the magnetic disks on which information is recorded, which are stacked at substantially equal intervals, and are stacked with the magnetic disks so as to rotate together with the magnetic disks at substantially the same intervals as the above-mentioned intervals. A sealed magnetic disk device characterized by: