JPH0574130A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent occurrence of a head crush and to increase the reliability of a magnetic disk device by collecting dust between magnetic disks efficiently. CONSTITUTION:A support arm 4 bearing a magnetic head 3 inserted between magnetic disks 2 has a hollow structure and openings 25a and 25b are provided in surfaces 21 and 22 being parallel to the magnetic disks 2 and in surfaces 23 and 24 being vertical thereto. Filters 9 are fitted to the openings 25a and 25b in the surfaces 21, 22 and 23 other than the opening 25a in the surface 24 which becomes the front in relation to the direction of rotation of the magnetic disk 2. Thereby cleaning of air between the magnetic disks 2 is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device, and more particularly to a mechanism for collecting minute foreign matter contained in an air flow inside a magnetic disk device housing and internal air.

[0002]

2. Description of the Related Art Generally, in a movable head type magnetic disk device, when a request for reading specific information recorded on a magnetic disk is made, the movable head is arranged so as to minimize the time until the reading starts. It must be moved rapidly in the radial direction to position.

FIG. 3 is a sectional view showing a conventional movable head type magnetic disk device.

In FIG. 3, a magnetic head 33 is provided corresponding to the magnetic disk 32, is held by a support arm 34, and moves in the radial direction of the magnetic disk 32 by a rotational movement, whereby the magnetic head 32 is moved to a designated position. Positioned.

The control of the positioning operation of the magnetic head 33 is performed by
The position of the magnetic head 33 is detected by a magnetic head (servo head) having a position detection function, the result is sent to a voice coil motor control circuit, and the voice coil motor control circuit energizes the coil 35 of the voice coil motor to The magnetic field of the permanent magnet of the magnetic circuit 36 provided so as to face 35 causes a force between the coil 35 and the magnetic circuit 36, and the force causes a rotational movement to the support arm 34 integrated with the coil 35. The servo circuit system forms a closed loop in which the servo head carried on the tip of the support arm 34 is moved by the rotational movement of the support arm 34 and the position is detected. Reference numeral 31 is a housing, 37 is a spindle motor, and 38 is a circulation filter.

In order to increase the recording density in order to increase the storage capacity of the magnetic disk device, it is necessary to reduce the flying height of the magnetic head with respect to the magnetic disk.

However, since the flying height of the current magnetic head is smaller than 1 μm, when dust, which is a minute foreign substance, is generated or enters the magnetic disk device, it enters between the magnetic head 33 and the magnetic disk 32. This causes a head crash in which the magnetic head 33 collides with the magnetic disk 32.

[0008]

In the conventional magnetic disk device as described above, the casing 31 on the outer peripheral side of the magnetic disk 32 is used to clean the air in the magnetic disk device.
A circulation filter 38 is installed between the magnetic disk device and the magnetic disk device to collect dust in the magnetic disk device.

However, this circulation filter 38
Is installed on the outer peripheral side of the stacked magnetic disks 32, 32, so that it is difficult to collect dust existing between the magnetic disks 32, which causes a head crash.

An object of the present invention is to provide a magnetic disk device that solves the above problems.

[0011]

In order to achieve the above object, in a magnetic disk apparatus according to the present invention, a magnetic head provided for a plurality of magnetic disks and a plurality of magnetic heads carrying a plurality of magnetic heads are provided. A magnetic disk device having an arm and a housing for housing the magnetic disk and the magnetic head in a sealed manner, wherein the arm has a hollow structure at least in part and is a surface perpendicular to the magnetic disk. An opening communicating with the hollow structure on a surface parallel to the opening, the opening provided on a surface located rearward with respect to the rotation direction of the magnetic disk, and the opening provided on a surface parallel to the magnetic disk. The opening is equipped with a filter.

[0012]

According to the present invention, the dust is collected on the disk surfaces of the stacked magnetic disks by having a hollow structure in the support arm arranged so as to face the disk surfaces.

[0013]

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

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

In FIG. 1, a magnetic disk 2 is laminated and attached to an output shaft of a spindle motor 7, and is rotated in a housing 1 for sealing. The magnetic heads 3 are provided respectively corresponding to the magnetic disks 2 of each stage, are held by the support arm 4, and are moved in the radial direction of the magnetic disk 2 by the rotational movement of the combination of the coil 5 and the magnetic circuit 6 to move the disk 2. It is positioned at the specified position. 8 is a circulation filter.

In such a magnetic disk device, the air between the magnetic disks 2 flows in the disk rotation direction as the magnetic disks 2 rotate. At the same time, the dust attached to the surface of the magnetic disk 2 also moves due to the air flow.

At this time, the support arm 4 carrying the magnetic head 3 also enters between the upper and lower magnetic disks 2. Details of the support arm 4 are shown in FIG.

At least a part of the supporting arm 4 inserted between the magnetic disks has a hollow structure, and has a surface 21 and a surface 22 parallel to the magnetic disk and a surface 23 and a surface 24 perpendicular to the magnetic disk. , An opening 25 communicating with the hollow structure
a and 25b are provided respectively.

Further, a filter 9 is attached to each of the openings 25a and 25b of the three surfaces 22, 23 and 24 except the opening 25a of the surface 24 which is the front surface with respect to the rotation direction of the disk indicated by the arrow in the figure. ing.

By thus forming the openings 25a and 25b on the hollow support arm 4 and providing the filter 25, the dust between the magnetic disks 2 and 2 passes through the openings 25a of the surface 24 by the air flow. It flows into the hollow structure of the support arm 4, and the openings 25a of the surfaces 21, 22, 23,
When passing through 25b, it is collected by the filter 9 and can promote cleaning between the magnetic disks.

[0021]

As described above, the magnetic disk device of the present invention forms a flow of dust in the support arm carrying the magnetic head, and collects the dust causing the head crash by the filter of the support arm. Therefore, there is an effect that a highly reliable magnetic disk device can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a diagram showing a support arm according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a conventional magnetic disk device.

[Explanation of symbols]

 1 Case 2 Magnetic Disk 3 Magnetic Head 4 Support Arm 5 Coil 6 Magnetic Circuit 7 Spindle Motor 8 Circulation Filter 9 Filter 25a, 25b Opening

Claims (1)

[Claims] 1. A magnetic head provided corresponding to a plurality of magnetic disks, a plurality of arms carrying a plurality of magnetic heads, and a housing for hermetically housing the magnetic disks and the magnetic heads. In the magnetic disk device, the arm has a hollow structure in at least a part thereof, and has an opening communicating with the hollow structure on a surface parallel to a surface perpendicular to the magnetic disk, A magnetic disk device comprising a filter provided in the opening provided on a surface located rearward with respect to the rotation direction of the disk and the opening provided on a surface parallel to the magnetic disk.