JPH01218346A - Magnetic disc device - Google Patents

Abstract

PURPOSE:To prevent any trouble such as degaussing of information, by installing magnetic particle dust-collecting filters in the air gap of a voice coil motor. CONSTITUTION:A recording medium magnetic disc 1 is incorporated in a spindle 3, and a carriage 4 is fitted with an electric coil 6 and a magnetic head 2 for reading and writing a magnetic disc information. An air flow generated by operation of said coil 6 within the air gap attaches to a magnet 5C to dust attachments such as ultrafine particles which cannot be removed by washing and so on. Then, said particles are collected by magnetic particle dust-collecting filters 7 installed in the same air gap so as to be prevented from going out of voice coil motor 5. Thus, it is possible to collect dust flowing into the minute gap between the magnetic head 2 and magnetic disc 1 without causing any serious trouble such as degaussing of data.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to cleaning inside a magnetic disk device.

The present invention relates to a magnetic disk drive having a magnetic particle dust collecting filter or an adsorption member suitable for dust collection and suppressing magnetic particles generated from the air gap of a voice coil motor (VAM).

[Conventional technology]

A conventional device as shown in the third example, which is equipped with a voice coil motor that moves the coil by applying a current to the coil, is equipped with a single-shaped yoke and a bobbin around which a coil is wound. The center yoke, side yokes, and magnets are configured so that they are in direct contact with the outside air. Said 3
The voice coil motor, which is composed of a letter-shaped yoke, is triggered by outside air, leading to malfunction of the magnetic disk drive. Therefore, in devices employing the external air circulation method, a method is adopted in which the dirty air flowing out of the voice coil motor is discharged to the outside using an exhaust valve or the like. However, in magnetic disk drives that are becoming smaller and lighter, the external air circulation method is not suitable.

It cannot be adopted structurally. In addition, in equipment that uses an internal air circulation method, dust generated from the voice fill motor can be cleaned by cleaning parts and improving process cleanliness.
Although C-P was prevented, the prevention was not sufficient.

Furthermore, a voice coil motor is constructed of a cylindrical housing made of a magnetically conductive material having a base portion, a peripheral outer wall, an i6, and a central magnetic pole.

Arrangement I11 is required to prevent dust generation.

A short-circuit winding is fixed to the central pole.

A magnet is attached in contact with the inner surface of the outer wall,
The magnet is separated from the central pole by a uniformly sized air gap (3) on its inner surface that houses a reciprocating electric coil.

Since the air gap remains in a hollow state, the particles and magnetic particle deposits generated in the 1-mamemata process are removed during the rotation of the magnetic disk and the positioning operation of the magnetic head. The dust and magnetic particles are scattered by the wind flow and float in the BD, and adhere to the magnetic head and magnetic disk, causing a problem that causes data demagnetization.

For this reason, as described in Japanese Patent Application Laid-Open No. 60-257756, the magnet is sealed outside the head disk area so that the cavity between the magnet and the housing base is not exposed to the periphery of the head disk assembly. The present invention provides linear motor devices and head disk assemblies free of stray magnetic particles by means of eliminating the need for coatings.

Also, as described in Japanese Utility Model Application Publication No. 59-9774.

By covering the top and side surfaces of the permanent magnet with a protective and fixing member, the permanent magnet is prevented from cracking, chipping, and scattering.

[Problem to be solved by the invention]

The above-mentioned conventional technology has a problem in that sufficient dust collection is not performed for dust generated from the air gap of the VOM.

It is an object of the present invention to collect magnetic particles generated by the airflow resulting from the operation of electrical coils reciprocating at high speed within the air gap of a VOM.

[Means to solve the problem]

The above purposes are as follows: (1) Magnetic particle dust collection filter (2) Magnetic particle dust collection filter and 71 inches for cooling ventilation (77 inches for ultra-low speed rotation) (5) Member for adsorption of suspended particles and coarse particles, voice coil This is accomplished by afting the motor air gap.

[Effect]

The magnetic particle dust collection filter incorporated in the air gap of the above VOM.

The magnetic particles emitted by the magnet are collected by the airflow caused by the working of the electric coil inside the gear, which moves back and forth with the gear that holds the magnetic head that flies low above the surface of the magnetic disk and reads and writes information. It is designed to prevent VOM from flowing out of the air gap.

This means that LACLD can collect dust, especially magnetic particles, that flow into the minute gap between the head and the magnetic disk.
It does not cause important problems such as data degaussing.

〔Example〕

An embodiment of the single-shot 811 will be described below with reference to FIG.

A magnetic disk 1, which is a recording medium, is installed in a spindle 5''.A magnetic disk 1 is mounted on the carriage 4.
A magnetic head 2 and an electric coil 6 for reading and writing information are attached.

The electric coil 6 has a uniform thickness between the magnet and a central pole attached to the base of the VOM, is coaxial with the central pole, and reciprocates within the air gap.

The air flow generated by the electric coil 6 moving within the air gap adheres to the magnet.

It generates deposits such as ultrafine particles that cannot be removed by cleaning or the like, such as magnetic particles. The generated magnetic particles are collected by a magnetic particle filter 7 installed in the same air gap, and are prevented from being released outside the voice coil motor 5.

The magnetic particle dust collection filter 7 has a voice coil with a shape of 2 (a) or 2 (b) depending on the shape of the voice coil, for example, a cylindrical shape or a cylindrical shape.

(a) etc. will be installed.

(a) is a glasses ffl dust collection filter suitable for a 5H shape.

(b) is a ring type N filter and is suitable for a cylindrical type. Further, (C) is a conical shaped filter and is suitable for a cylindrical type. Arrows indicate air flow.

In (c), the diagonally shaded part of the member for attracting floating particles and fB magnetic particles is hollowed out, and it can also be applied to a means for collecting dust by installing it in the air gap of the voice coil motor 5.

Furthermore, it is also possible to install the filter in (a)*(b) in an integral structure with a cooling fan.

〔Effect of the invention〕

According to the present invention, the air gap is provided with the above (1) magnetic particle dust collection filter, (2) @air particle dust collection filter and cooling fan (ultra low speed rotation fan), or (5) suspended particles, magnetic particle adsorption. By installing materials for

The magnetic particles attached to the magnet are released by the following motion of the airflow generated by the reciprocating movement of the electric coil 6 due to positioning operation or the like. This has the effect of collecting these loose and scattered magnetic particles.

As a result, magnetic particles are generated and released from the VOM and float inside the HDA, causing the magnetic disk 1 and the magnetic head 2 to
It is possible to prevent the information from being embedded in or attached to it, and it is also possible to prevent important problems caused by demagnetization of information.

The magnetic particles targeted for dust collection are those that cannot be removed by dry or wet cleaning.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment 911 of the present invention. 21 is a perspective view showing the shape of a magnetic particle dust collection filter; FIG. 3 is a perspective view of a conventional device, and FIG. 4 is a perspective view of a conventional device equipped with a cylindrical voice coil. 1...Magnetic disk, 2...Magnetic head. 3...Spindle, 4.Yutaka/Nakayaritsushi. 5...Voice coil motor. 5a...Base, sb...Center magnetic pole. 5c...Magnet, 6...Electric coil. 7...Magnetic particle dust collection filter. 7a...Fan. 8... Adsorption member. Representative Patent Attorney: Isamu Ogawa, 1st Cun

Claims (1)

[Claims] 1. In the voice coil motor, the voice coil motor is mounted on the housing to create a cavity between a base, a central magnetic pole attached to the base, an inner end thereof, and an inner end of the base of the housing. a magnet disposed on the housing to provide an air gap having a uniform thickness between the inner surface thereof and the central pole and accommodating an electric coil reciprocating coaxially with the central pole; A magnetic disk device characterized by being provided with a magnetic particle dust collection filter.