JPS58194101A - Base of disc device - Google Patents

Abstract

PURPOSE:To reduce the vibration of a carriage, by absorbing the vibration of a disc assembly due to the rotation and external mechanical vibration with a ferrite composite material constituting a part or all of a disc device. CONSTITUTION:A spindle 3 of the magnetic disc assembly 2 on which plural magnetic discs 1 are loaded is supported with a bearing 4 and fitted to a base 10 via a vibration absorbing member 12 made of the ferrite composite material, and a supporting member 7. The carriage 22 loading magnetic heads 21 is constituted so as to move on rails 11 fitted to the base 10 via a vibration absorbing member 13 made of the ferrite composite material. The ferrite composite material is a complex being a mixture of ferrite having 0.1mum-10mum grain distribution and a polyester system resin.

Description

[Detailed description of the invention] The present invention relates to a substrate for a disk device.

The substrate of a conventional disk device is mainly made of a metal or alloy having a phosphor composition such as Alonium or an alloy thereof, and a disk assembly having a rotating shaft and a disk constituting this disk assembly are mounted on this substrate. A positioning device 1 (hereinafter referred to as a carriage) equipped with a head for writing or reading information is attached to the disk, and while rotating the disk assembly, the carriage is moved linearly or rotated in the opposite direction from the outer periphery of the disk to the center. It has a structure in which it is moved by movement and positioned on a desired track to write information or increase data.

When performing a write or read operation in a disk device having the above-mentioned configuration, the rotation of the disk assembly is 1! Due to the uneven mass distribution of the rotating body and uneven air resistance, vibrations occur due to the rotation of the rotating body, and this vibration is transmitted to the carriage through the board, causing vibrations in the carriage, or external vibrations. The mechanical vibrations transmitted to the carriage through the substrate cause vibrations in the carriage, which may cause deviations in track positioning of the additional write head. Therefore, conventional disk drives are designed to reduce such track position deviations.

In particular, it is necessary to strictly conduct manufacturing and inspection to ensure uniform mass distribution of the disk assembly.

Moreover, since it is not possible to remove vibrations caused by uneven air resistance or vibrations transmitted from the outside, there is a drawback that track position deviation and thus the reading error rate cannot be significantly improved.

An object of the present invention is to provide a substrate for a disk device that can eliminate the above-mentioned drawbacks and improve the read error rate by preventing vibrations caused by the rotation of a disk assembly and external mechanical vibrations from being transmitted to the carriage. It's about doing.

The substrate of the disk device of the present invention is made of a ferrite composite material with excellent disk assembly properties.

The present invention will be described in detail below with reference to the drawings.

The figure shows a side view of a magnetic disk device using a substrate according to an embodiment of the present invention, and shows a magnetic disk assembly 2#'i on which a plurality of magnetic disks 1 are mounted.

A rotating shaft (hereinafter referred to as a spindle) 3 is rotatably attached to a bearing 4, and a gooley 5 is attached to the lower end of the spindle 3, and is rotated by a motor (not shown) via a belt 6.

A vibration absorbing member 12 is electrically distributed between the supporting member 7 and the substrate 10, and vibrations generated by the rotation of the magnetic disk assembly 2 are transmitted from the bearing 4 and the supporting member 7 to the substrate 10 through the vibration absorbing member 12.

- 10,000, a carriage 22Fi on which a magnetic head 21 for reading or writing information to the magnetic disk 1 is mounted;
The coil 23 and the voice coil motor 24 are movable on a rail ll mounted on the board 1o.
The magnetic disk 1 is moved from the outer periphery toward the center of the magnetic disk 1 or vice versa, and is positioned 1f on a random track.

A vibration absorbing portion #13 is arranged between the rail 11 and the fourth plate 10, and vibration generated by the rotation of the disk assembly 2 is transmitted to the board 10 through the bearing 4, the support member 7, and the vibration absorbing member 12't''. The vibration absorbing member 13, the rail 11 and the t
- retroactively transmitted to carriage 22;

As the material for the vibration absorbing members 12 and 13, we use a ferrite composite material, which has particularly excellent vibration absorption properties. As shown in the figure below, it has vibration absorption properties that are approximately 100 times greater than those of iron or alonium.

Therefore, the magnetic disk drive assembled using the substrate configured as described above has a vibration absorbing section while mechanical vibrations generated by the rotation of the magnetic disk assembly 2 are transmitted from the outside to the carriage 22. Since it is absorbed by It 12 and 13, the vibration transmitted to the carriage becomes extremely small, improving the 1-degree positioning and thus reducing the d-mistake rate.

Tei Note that the above-mentioned embodiment @ swing member 12 or 13Fi.

Depending on the conditions, it is also possible to use only 10,000 of them, and the entire board 10 may be used as a ferrite composite material.
It is also possible to configure by

The above embodiment is an example of a magnetic disk device in which the carriage moves linearly, but it has a rotating shaft on the substrate,
It is clear that in the case of a magnetic disk drive having a so-called swing arm type carriage that rotates in line with the axis, the same purpose as the embodiment shown in the figure can be achieved by arranging a vibration absorbing member around the rotation axis. It is.

Although the above embodiment is an example of a single board of a magnetic disk device, it is clear that the same effect can be obtained by using a similar structure in a substrate of an optical disk device.

As explained in detail above, the 9. Since vibrations of the carriage can be reduced by absorbing vibrations caused by the rotation of the disk assembly and mechanical vibrations from the outside, a disk device with high track positioning accuracy and a low reading sinus rate can be obtained. There is a □ru.

[Brief explanation of the drawing]

The figure is a partially sectional view 11 of a magnetic disk device using an embodiment of the present invention. In the figure, 1...disc, 2...disk assembly, 3...rotating shaft (spindle), 4...
...Bearing, 5...Boo IJ-%6...
Belt, 7...Supporting member, 10...Substrate, 11...Rail, 12.13...
Vibration absorbing member, 21...Magnetic head% 22...
...Carriage, 23... Coil, 24...
...Voice coil motor.

Claims (1)

[Claims] 1. A substrate for a disk device, wherein one plate of the disk device that supports a disk assembly and a positioning device is made of a ferrite composite material having excellent disk assembly accommodation properties.