JP2002367318A - Magnetic disk drive - Google Patents

Abstract

(57) Abstract: An object of the present invention is to reduce the vibration of a spindle motor unit from a disk that increases with a high-speed rotation of a magnetic disk device. SOLUTION: By using a damping metal material such as a magnesium alloy having a logarithmic decrement of 0.1 or more as a constituent material of a hub 1a, a magnetic disk 2, a clamper 3, and a spacer 4 of a magnetic disk device, the disk can be moved from a spindle to a spindle. It is possible to suppress the resonance of the motor unit, and it is possible to realize a high recording density and a high speed rotation of the magnetic disk device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive for recording and reproducing signals with a magnetic head while rotating a magnetic disk.

[0002]

2. Description of the Related Art An example of a conventional magnetic disk drive will be described below with reference to FIG. 3, a magnetic disk 22 and a spacer 24 are inserted into a hub 21a of a spindle motor 21, and are fixed to the hub 21a by a clamper 23. The magnetic head 25 is located on the magnetic disk 22. The magnetic head 25 is fixed to a carriage 27 via a leaf spring 26, and a voice coil motor 28 is attached to the carriage 27. These components are stored in a case 29, and the case 29 is an upper case 29.
a, the lower case 29b. Here, the hub 21a of the spindle motor 21 is made of iron / stainless steel material, the magnetic disk 22 is made of quartz or glass, and the clamper 23 is made of iron / stainless steel.
The stainless steel material and the spacer 24 are made of iron / stainless steel material. As another example, the hub 21a of the spindle motor 21 is made of an aluminum alloy material, the magnetic disk 22 is made of an aluminum alloy, the clamper 23 is made of an aluminum alloy material, and the spacer 24 is made of an aluminum alloy material.

[0003] The operation of the conventional magnetic disk device configured as described above will be described below. When power is supplied to the spindle motor 21, the magnetic disk 22, the spacer 24, and the clamper 23 are driven to rotate together with the hub 21a. At the same time, the magnetic head 25
On the other hand, due to the effect of the air bearing, it floats up to a minute gap. When the voice coil motor 28 is also energized, the carriage 27 is oscillated to drive the magnetic head 2.
Numeral 5 moves at high speed on the magnetic disk 22 and performs recording and reproduction.

[0004]

However, the above configuration has the following problems. As the recording density of magnetic disk devices increases, finer positioning accuracy is required for magnetic heads, and as the rotation speed increases, the vibration from the disk to the spindle motor increases. The possibility that the magnetic head will cause a reading error at the resonance of the portion increases, which may be a factor of hindering high recording density and high speed rotation.

[0005]

In order to solve the above-mentioned problems, a magnetic disk drive according to the present invention comprises: a magnetic disk; a hub of a spindle motor on which the magnetic disk is mounted;
A clamper for fixing the magnetic disk to the hub; and a ring-shaped spacer mounted on the spindle motor coaxially in contact with the magnetic disk, wherein the magnetic disk, the hub, the clamper, and the spacer A metal material having a logarithmic decrement of 0.1 or more is used as a constituent material of at least one of the members. Compared to the case where the aluminum alloy of No. 002 is used, the resonance of the spindle motor from the disk is attenuated.

As a result, it is possible to obtain a high-density, high-speed rotating magnetic disk drive while suppressing resonance.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic disk drive according to an embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a sectional view of a magnetic disk drive according to the present embodiment.

In FIG. 1, a magnetic disk 2 and a spacer 4 are inserted into a hub 1 a of a spindle motor 1 and fixed to the hub 1 a by a clamper 3. The magnetic head 5 is located on the magnetic disk 2. The magnetic head 5 is fixed to a carriage 7 via a leaf spring 6, and the carriage 7
Is provided with a voice coil motor 8. These components are housed in a case 9, and the case 9 includes an upper case 9a and a lower case 9b. Here, the hub 1a, the magnetic disk 2, the clamper 3, and the spacer 4 are made of a magnesium alloy having a logarithmic decrement of 0.1.

The operation of the magnetic disk drive configured as described above will be described below. When power is supplied to the spindle motor 1, the hub 1a and the magnetic disk 2
, Spacer 4 and clamper 3 are driven to rotate. At the same time, the magnetic head 5 floats with a small clearance formed on the magnetic disk 2 by the effect of the air bearing. When the voice coil motor 8 is also energized, the carriage 7 is driven to swing by driving the magnetic head 5 on the magnetic disk 2 at high speed to perform recording and reproduction.

At this time, resonance occurs in a portion from the disk to the spindle motor. In this embodiment, as compared with a conventional example made of a material other than a magnesium alloy as shown in the radial resonance data of FIG. Thus, the effect of reducing resonance is remarkable. Therefore, at high recording density and high speed rotation, the resonance of the spindle motor unit from the disk is attenuated well, and a magnetic disk device in which the magnetic head does not cause a reading error can be obtained.

[0012]

As described above, according to the present invention, the magnetic disk drive can attenuate the resonance of the portion from the disk to the spindle motor well even at high recording density and high speed rotation, and the magnetic head causes a reading error. And a magnetic disk drive without the above.

[Brief description of the drawings]

FIG. 1 is a sectional view of a magnetic disk drive according to an embodiment of the present invention.

FIG. 2 is a comparison diagram of the radial resonance characteristics of the magnetic disk drive.

FIG. 3 is a sectional view of a conventional magnetic disk drive.

[Explanation of symbols]

 Reference Signs List 1 spindle motor 1a hub 2 magnetic disk 3 clamper 4 spacer 5 magnetic head

Claims (1)

[Claims] 1. A magnetic disk device for performing recording and reproduction on a magnetic disk by a magnetic head, wherein the magnetic disk, a hub of a spindle motor mounting the magnetic disk, a clamper for fixing the magnetic disk to the hub, A ring-shaped spacer mounted on the spindle motor coaxially in contact with the magnetic disk,
A magnetic disk drive, wherein a metal material having a logarithmic decrement of 0.1 or more is used as a constituent material of at least one of the magnetic disk, the hub, the clamper, and the spacer.