JPH0294184A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To suppress relative vibrations produced between magnetic heads and a magnetic disk smaller by absorbing the reaction force produced in permanent magnets forcing the magnetic heads when the magnetic heads made abrupt moving motions by means of vibration absorbing members. CONSTITUTION:Permanent magnets 56A and 56B are fixed to a yoke 57 through vibration absorbing members 2 and 2. When a voice coil 55 section abruptly moves in accordance with a call or write instruction, the reaction force is transmitted to the magnets 56A and 56B. However, the reaction force is not transmitted, since the magnets 56A and 56B are fitted to the yoke 57 through the members 2 and most of the reaction force is effectively absorbed by the members 2 before reaching the yoke 57. Therefore, the vibration which has been transmitted to a magnetic disk assembly body 51 through the yoke 57, a housing 60, and basic main body 100 in the conventional magnetic disk device can be absorbed effectively by the vibration absorbing members 2 which absorb most of the energy of the vibration at the movement when the vibration is produced. Thus relative displacement between magnetic heads and a magnetic disk 50 caused by vibrations can be prevented.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a magnetic disk device, and particularly relates to an arm assembly equipped with one or more magnetic heads, and a rotational force applied to the arm assembly. The present invention relates to a magnetic disk device equipped with a voice coil motor section that operates.

[Conventional technology]

In order to minimize the time required to retrieve stored information in response to a request for retrieving information on a magnetic disk in response to an external command, a magnetic disk device rapidly moves the magnetic head in the radial direction of the magnetic disk. This makes it possible to achieve accurate positioning.

FIG. 3 shows a conventional example. The conventional example shown in FIG. 3 includes a magnetic disk assembly 51 including a plurality of (three) magnetic disks 50, and four magnetic heads disposed facing the information storage surface of each magnetic disk. 52, an arm assembly 53 that supports each magnetic head 52 and moves each magnetic head 52 integrally in the radial direction;
The arm assembly 53 is provided with a voice coil motor section 54 that applies rotational force.

The voice coil motor section 54 includes a voice coil 55 attached to a part of the arm assembly 53 described above, permanent magnets 56A and 56B that electromagnetically bias the voice coil 55, and permanent magnets 56A and 56B that electromagnetically bias the voice coil 55. The yoke 57 fixedly supports the magnets 56A and 56B. Here, the permanent magnets 56A and 56B are fixed to the yoke 57 with a high hardness adhesive 70.

The arm assembly 53 also includes two arms 53A and 53Δ, each of which has the magnetic head 52 mounted on the upper and lower surfaces of its tip end, and these two arms 53A and 53A are fixed and supported at the center of rotation. The cylindrical body 53B and this cylindrical body 5
A rotating shaft 53 that supports 3B via bearings 53C, 53C.
It is composed of D. And this rotating shaft 53D
is attached to the open end of the U-shaped housing 60. A yoke 57 equipped with the above-mentioned permanent magnets 56A and 56B is installed in the deep part of the housing 60, as shown in FIG. Reference numeral 100 indicates a substrate main body housing the aforementioned housing 60 and magnetic disk assembly 51.

[Problem to be solved by the invention]

However, in the conventional example described above, when the arm assembly 53 performs a rapid movement during the positioning operation of the magnetic head 52, the permanent magnets 56A,', )6B receive the reaction force. The faster the arm assembly 53 moves, the more impactful the reaction force becomes, and this becomes vibrational displacement.
York 57. Housing 60. It propagates to the substrate body 100 and the magnetic disk assembly 51. Therefore, a relative vibrational displacement occurs between the magnetic head 52 and the magnetic disk assembly 51, which impedes accurate positioning of the magnetic head.
There was this inconvenience.

[Purpose of the invention]

An object of the present invention is to improve the disadvantages of the conventional example, and in particular to effectively prevent the relative vibrational displacement between the magnetic head and the magnetic disk that occurs during the seek operation of the magnetic head, and to quickly and efficiently position the magnetic head. The object of the present invention is to provide a magnetic disk device that can perform accurate operations.

[Failure to solve the problem]

Therefore, the present invention includes an arm assembly equipped with a magnetic head, a voice coil motor section that applies rotational force to the arm assembly, and a magnetic disk having a magnetic storage surface facing the magnetic head. . Of these, the voice coil motor section is composed of a voice coil attached to an arm assembly, a permanent magnet that applies an electromagnetic reaction force to this voice coil, and a yoke that fixedly supports this permanent magnet. . A configuration is adopted in which the permanent magnet is fixed to the yoke via a vibration absorbing member. This aims to achieve the above-mentioned purpose.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 and 2. Here, the same reference numerals are used for the same constituent members as in the conventional example (FIG. 3) described above.

The embodiment shown in FIG. 1, similar to the conventional example described above, includes an arm assembly 53 equipped with magnetic heads 52, 52. and a magnetic disk having a magnetic storage surface facing the magnetic head 52. The voice coil motor unit 1 includes a voice coil 55 attached to an arm assembly 53, two permanent magnets 56A and 56B that apply an electromagnetic reaction force to the voice coil 55, and permanent magnets 56A and 56B. A yoke 57 for fixed support is provided.

In this embodiment, the permanent magnets 56A and 56B are fixed to the above-mentioned yoke 57 via the vibration absorbing members 2, 2. As the vibration absorbing member 2, a layer formed of a viscoelastic adhesive or an adhesive whose hardness is relatively soft when cured is used. The other configurations are the same as the conventional example described above.

It should be noted that the vibration absorbing member 2 may be made of rubber or plastic.Next, the function of the vibration absorbing member 2 and the like will be explained.

When the voice coil 55 moves rapidly due to a calling or writing command, the reaction force is generated by the permanent magnet 56A,
It is transmitted to 56B. On the other hand, since the permanent magnets 56A56B are attached to the yoke 57 by the vibration absorbing member 2,
Most of the reaction force described above does not need to be propagated to the yoke 57 and is effectively absorbed by the vibration absorbing member 2.

For this reason, the yoke 57. The magnetic disk assembly 51 passes through the housing 60 and the board body 100
Since most of the energy of the vibrations that were propagated to the vibration absorbing member 2 is effectively absorbed by the vibration absorbing member 2 at the time of occurrence, the level of the vibrations can be suppressed to an extremely low level.

In the above embodiment, two permanent magnets 56A and 56B are used, but one or three or more permanent magnets may be used.

〔Effect of the invention〕

As described above, according to the present invention, the vibration absorbing member effectively absorbs the reaction force generated in the permanent magnet that energizes the magnetic head as it moves violently. This is an unprecedented advantage in that it is possible to significantly suppress the relative vibrations that occur between the disks, and as a result, the magnetic head can be moved to the required position on the magnetic disk quickly and with high precision. A magnetic disk device can be provided.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
A cross-sectional view showing the yoke and permanent magnet portion in the figure, and FIG. 3 is a cross-sectional view showing a conventional example. 1... Voice coil motor section, 2... Vibration absorbing member, 5
0...Magnetic disk, 52...Magnetic head, 53.
...Arm assembly, 55...Voice coil, 56A,
56B...Permanent magnet, 57...Yoke.

Claims (1)

[Claims] (1) An arm assembly equipped with a magnetic head, a voice coil motor unit that applies rotational force to the arm assembly, and a magnetic disk having a magnetic storage surface facing the magnetic head, the voice A magnetic disk device in which a coil motor section is constituted by a voice coil mounted on the arm assembly, a permanent magnet that applies an electromagnetic reaction force to the voice coil, and a yoke that fixedly supports the permanent magnet. A magnetic disk device, wherein the permanent magnet is fixed to the yoke via a vibration absorbing member.