JPH0248088A - Cleaning device and magnetic disk device produced by the same device - Google Patents

Abstract

PURPOSE:To effectively remove the magnetic foreign matter sticking to the material to be washed by providing magnetic field forming means forming magnetic fields to the outside of a washing tank which holds the washing liquid or washing gas in which the material to be washed is immersed or housed. CONSTITUTION:Plural magnets 4 and magnets 5 are provided in the postures in which the magnetic poles S and N different from each other are disposed to face each other to the side wall parts to be submerged under the liquid surface of the washing liquid 2 in a washing tank 1 and the magnetic fields M are formed in the direction from the magnets 5 to the magnets 4. Magnetic forces are acted on the material W to be washed and the washing liquid 2 from these magnets 4, 5, by which the detachment of the magnetic foreign matter 6 sticking to the material W is accelerated. In addition, the magnetic foreign matter 6 suspending in the washing liquid 2 is attracted and captured. The recontamination of the material W by the magnetic foreign matter 6 is thus prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cleaning technique, and particularly to a technique that is effective when applied to cleaning components of a magnetic disk drive.

[Conventional technology]

For example, in a magnetic disk device, the magnetic disk that is the storage medium and the magnetic head that records and reproduces information by forming a narrow gap with the surface of the magnetic disk may collide due to dust in the operating environment. In order to prevent this, for example, as disclosed in Japanese Patent Application Laid-Open No. 55-58857, magnetic disks, magnetic heads, etc. are housed in a sealed chamber, and a filter or the like is installed to keep the atmosphere inside the sealed chamber clean at all times. It is known.

Therefore, when assembling such magnetic disks, it is necessary to perform ultrasonic cleaning on not only the magnetic disk and the magnetic head, but also the sealed chamber, the actuator that drives the magnetic head, and other components to prevent interference. It is essential to remove and clean the causative foreign matter with a predetermined particle size or larger.

[Problem to be solved by the invention]

However, in the conventional technology, although some attention is paid to the size of foreign objects that may be interposed between the magnetic disk and the magnetic head during operation and cause collisions, there are cases where the size of foreign objects is less than the allowable limit. There was a problem in that no consideration was given to the removal of magnetic foreign matter.

In other words, even if magnetic foreign matter is so small that there is no risk of collision between the magnetic disk and the magnetic head, if it adheres to the magnetic disk or magnetic head during operation, it may prevent information from being recorded or reproduced on the magnetic disk. This causes problems such as making the operation unstable and causing information recorded on the magnetic disk to disappear unexpectedly.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a cleaning device that can effectively remove magnetic foreign matter attached to an object to be cleaned.

Another object of the present invention is to provide a magnetic disk device with improved operational reliability by reliably removing magnetic foreign matter adhering to component parts before assembly.

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[Means to solve the problem]

A brief overview of typical inventions disclosed in this application is as follows.

That is, the cleaning apparatus of the present invention includes a magnetic field forming means for forming a magnetic field inside a cleaning tank that holds a cleaning liquid or a cleaning gas in which an object to be cleaned is immersed or contained.

Further, the magnetic disk device of the present invention includes, prior to assembly,
The cleaning device according to claim 1 or 2 is used to clean component parts.

[Effect]

According to the above-mentioned cleaning device of the present invention, the magnetic force acting from the magnetic field forming means provided inside the cleaning tank promotes the removal of magnetic foreign matter attached to the surface of the object to be cleaned, and the object to be cleaned is Magnetic foreign matter floating in the cleaning liquid or cleaning gas to be immersed is reliably captured by the magnetic field forming means by magnetic force, so that it does not come between the magnetic disk and the magnetic head and cause damage to them, for example. Even minute magnetic foreign matter can be effectively removed from the object to be cleaned along with ordinary foreign matter.

Further, according to the above-described magnetic disk device of the present invention, by cleaning the component parts using the cleaning device according to claim 1 or 2 prior to assembly, collisions between the magnetic disk and the magnetic head can be avoided. In addition to ordinary foreign matter, for example, minute magnetic foreign matter that is present between the magnetic disk and the magnetic head and does not cause damage to both can be reliably removed from the assembled parts. Foreign matter is reliably prevented from adhering to the component parts and being brought into the sealed chamber in which the magnetic disk, magnetic head, etc. are housed.

This prevents problems such as the accidental loss of useful information recorded on magnetic disks due to magnetic foreign matter adhering to magnetic disks or magnetic heads, and improves the operational reliability of magnetic disk drives. improves.

〔Example〕

FIG. 1 is a cross-sectional view showing the main parts of a cleaning device according to an embodiment of the present invention, and FIG. 2 is a sectional view of a magnetic disk device in which components before assembly are cleaned by this cleaning device. FIG. 3 is an exploded view showing main parts of an example.

A cleaning liquid 2 made of, for example, Freon is stored inside the cleaning tank 1, and is configured such that an object W to be cleaned, such as a component of a magnetic disk device to be described later, is immersed therein for cleaning work.

Further, a transport mechanism (not shown) is provided above the cleaning tank 1, and is configured to carry the objects W to be cleaned into and out of the cleaning tank 1.

In the cleaning tank 1, ultrasonic waves 3 are applied to the side wall and bottom part submerged below the surface of the cleaning liquid 2 toward the center of the cleaning tank 1.
An ultrasonic oscillator #3 that emits ultrasonic waves 3a is arranged, and the cleaning liquid 2 is foamed by the cavitation effect that occurs when the ultrasonic waves 3a propagate inside the cleaning liquid 2. It has a structure that effectively promotes the cleaning action of.

In this case, a plurality of magnets 4 and 5 (magnetic field forming means) are provided on the side wall of the cleaning tank 1 that is submerged below the surface of the cleaning liquid 2, with different magnetic poles S and N facing each other. , inside the cleaning tank 1, there are magnets 5 to 4.
A magnetic field M is formed in the direction leading to .

The object to be cleaned W and the cleaning liquid 2 are then drawn from these magnets 4.5.
By applying a magnetic force to
The magnetic foreign matter 6 floating inside is attracted and captured to prevent the object W to be cleaned from being re-contaminated by the magnetic foreign matter 6.

On the other hand, FIG. 2 is an exploded assembly diagram showing an example of a magnetic disk device in which component parts are cleaned by a cleaning device such as the one described above before assembly.

For example, a box-shaped base 10 made of aluminum die-casting or the like has a spindle lla driven by a spindle motor (not shown) and this spindle l.
A spindle assembly 11 consisting of a flange portion ttb and the like that rotatably supports the spindle la is airtightly fixed inside the base 10 via a flange portion 11b.

Furthermore, this spindle assembly 11 includes a spacer 12.
A donut-shaped magnetic disk 13 is attached through the
It is configured to be fixed by a clamp 14 so as to rotate together with the spindle lla.

Inside the base 10, on the side of the magnetic disk 13, there is a swing shaft 15C rotatably supported by the base 10 in an attitude parallel to the spindle lla via a plurality of bearings 15a, 15b, and a plurality of bearings. 15a and 15
A plurality of bearings 15a are sandwiched between a plurality of bearings 15a and b via a plurality of spacers 15d and 15e in the axial direction of the swing shaft 15C.

Spring 15f that stabilizes the position of 15b, and this spring 15
The plurality of bearings 15a, 15 resist the urging force of f.
a clamp 15g that fixes the components such as b to the inside of the base 10; a swinging arm 15h that is fixed to the end of the swinging shaft 15c inside the base 10 and swings in a plane parallel to the magnetic disk 13; An actuator assembly 15 is provided that includes a cam member 15i that engages with a portion of the swing arm 15h, and a step motor 15j that applies swing torque to the swing arm 15h via the cam member 15i.

Further, a swing arm 15 supported by a swing shaft 15'C
h includes a head arm 16a having one end fixed to the swing arm 15h, a leaf spring 16b fixed to the other end of the head arm 16a and having its tip positioned on the plane of the magnetic disk 13; A plurality of sets of magnetic head assemblies 16 including magnetic heads 160 fixed to the tip of the leaf spring 16b are attached, and the magnetic heads 16C of each magnetic head assembly 16 are attached to the upper and lower surfaces of the magnetic disk 13. They face each other with a predetermined gap between them.

Then, due to the swinging torque of the step motor 15j,
Cam member 151. Swing arm 15h, head arm 16
a. By displacing the plurality of magnetic heads 16c in the radial direction of the magnetic disk 13 via the leaf spring 16b, any of a plurality of tracks (not shown), which are information recording areas provided concentrically on the magnetic disk 13, can be moved. A seek operation is performed to position the magnetic head 16c over one of the two.

Further, a cover 18 is airtightly attached to the base 10 via a gasket 17, and the magnetic disk 13. Actuator assembly 15. A sealed chamber 19 is configured to protect the magnetic head assembly 16 and the like from external dust and the like.

Further, a sealed chamber 1 composed of a base 10 and a cover 18 is provided.
A dust removal filter 20 is installed inside the air filter 9, and uses airflow generated inside the airtight chamber 19 due to the rotation of the magnetic disk 13 to capture dust and the like floating in the internal atmosphere of the airtight chamber 19. It is configured to

The operation of this embodiment will be explained below.

In the following description, as an example of the cleaning operation, a cleaning operation performed on each component such as the base 10 when assembling the magnetic disk drive shown in FIG. 2 will be described.

First, the cleaning liquid 2 stored inside the cleaning tank l becomes foamed due to the cavitation effect caused by the energy of the ultrasonic waves 3a emitted from the plurality of ultrasonic oscillation sources 3 provided inside, and also .5, a magnetic field M is formed inside the cleaning liquid 2.

In this state, for example, a base 10, which is one of the components of a magnetic disk drive, is immersed in the cleaning liquid 2 as an object W to be cleaned, as shown in FIG. 1, by a transport mechanism (not shown).

At this time, ordinary foreign matter and magnetic foreign matter 6 adhering to the surface of the base 10, which is the object W to be cleaned, are efficiently removed by the cavitation action by the ultrasonic waves 3a, and the object W to be cleaned, such as the base 10, is removed efficiently. The magnetic foreign matter 6 that separates from the magnet 4.
5, the cleaning liquid 2 is attracted to the magnet 4.5 by the action of the magnetic field M formed inside the cleaning liquid 2, and is reliably removed without causing the cleaning liquid to land on the object W again.

After the above-mentioned cleaning process continues for a predetermined period of time, the object W to be cleaned, such as the base 10, is pulled up from the cleaning liquid 2 by a transport mechanism (not shown) and transported to a later drying process or the like.

Thereafter, the spacer 12. which fixes the magnetic disk 13 to the spindle assembly 11. Clamp 14, actuator assembly 15 excluding a plurality of bearing links, step motor, etc. The cleaning operation is sequentially performed on the magnetic hend assembly 1G, the cover 18, etc.

Here, since the conventional cleaning apparatus is not provided with the magnet 4.5, etc., when the object W to be cleaned, such as the base 10, has a complicated shape, or when the object W to be cleaned is pulled up from the cleaning liquid 2, etc. There was a risk that the magnetic foreign matter 6 floating inside the cleaning liquid 2 would adhere to the object W to be cleaned again.

However, in the case of this embodiment, by performing the cleaning process with the object W to be cleaned positioned in the magnetic field M formed inside the cleaning liquid 2, magnetic foreign particles from the surface of the object W to be cleaned are removed. 6 and the like, and the magnetic foreign matter 6 once detached from the object W to be cleaned such as the base 10 is removed by the magnet 4,
5, the object to be cleaned W, which has been cleaned by the cleaning operation, is reliably prevented from being recontaminated by the magnetic foreign matter 6.

By applying such a cleaning agent 1, not only ordinary foreign matter but also magnetic foreign matter 6, which has been overlooked in the past, is reliably removed and cleaned. will be assembled and then put into actual operation.

Here, the particle size of the foreign matter adhering to the actuator assembly 15, magnetic head assembly 16, etc. housed inside the sealed chamber 19 may cause the magnetic disk 13 and the magnetic head 16C, which face each other with a narrow gap, to Even if the foreign object is small enough not to cause a collision, if the foreign object is a magnetic material, it may adhere to the magnetic hecite 16C or the magnetic disk 13 during operation and remove useful information magnetically recorded on the magnetic disk 13. This may cause problems such as accidental disappearance.

However, in the case of this embodiment, the magnet 4 also removes minute magnetic foreign particles 6 below the allowable limit, which were overlooked in the conventional cleaning process.
, 5, the information recorded on the magnetic disk 13 during operation can be reliably removed from being accidentally lost, and other troubles can be reliably avoided.

This improves the reliability of the operation of the magnetic disk device.

Furthermore, when the component parts of the magnetic disk device to be subjected to the cleaning process are magnetic materials, after the above-mentioned cleaning process, a predetermined demagnetization process is performed and the components are subjected to the assembly process.

This prevents components of the magnetic disk device that are magnetized by the magnet during cleaning from causing magnetic noise during operation.

Although the invention made by the present inventor has been specifically explained above based on Examples, it goes without saying that the present invention is not limited to the Examples and can be modified in various ways without departing from the gist thereof. Nor.

For example, as a cleaning method, as in the above embodiment,
The method is not limited to one that utilizes the cavitation effect of ultrasonic waves using a cleaning liquid, and the magnetic field forming means may be combined with other methods such as air cleaning or steam cleaning using organic solvent vapor.

Furthermore, methods for creating a magnetic field in the cleaning tank are not limited to using permanent magnets to create a magnetic field in a fixed direction.
An alternating magnetic field may be formed using an alternating current electromagnet.

〔Effect of the invention〕

A brief explanation of the effects obtained by typical inventions disclosed in this application is as follows.

That is, according to the cleaning apparatus of the present invention, since the cleaning tank that holds the cleaning liquid or cleaning gas in which the object to be cleaned is immersed or accommodated is provided with a magnetic field forming means for forming a magnetic field, the cleaning device is provided with a magnetic field forming means that forms a magnetic field inside the cleaning tank that holds the cleaning liquid or cleaning gas in which the object to be cleaned is immersed or accommodated. The detachment of magnetic foreign matter adhering to the surface of the object to be cleaned is promoted, and the magnetic foreign matter floating in the cleaning liquid or cleaning gas in which the object to be cleaned is immersed or contained is reliably captured by the magnetic field forming means by the magnetic force. ,
For example, minute magnetic foreign objects that are interposed between a magnetic disk and a magnetic head and do not cause damage to both may be exposed along with normal foreign objects that cause collisions between the magnetic disk and the magnetic head. It can be effectively removed from the wash.

Further, according to the magnetic disk device of the present invention, by cleaning the component parts using the cleaning device according to claim 1 or 2 prior to assembly, normal Not only foreign objects, but also minute magnetic foreign objects that are present between the magnetic disk and the magnetic head and do not cause damage to both can be reliably removed from the assembled parts. It is reliably prevented from adhering to component parts and being brought into the sealed chamber where magnetic disks, magnetic heads, etc. are housed.

This prevents failures such as the accidental loss of useful information recorded on magnetic disks due to magnetic foreign matter adhering to magnetic disks or magnetic heads, thereby providing reliable operation in magnetic disk drives. Improves sex.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the main parts of a cleaning device that is an embodiment of the present invention, and FIG. 2 is an example of a magnetic disk device in which component parts are cleaned by this cleaning device before assembly. FIG. 3 is an exploded view showing main parts. DESCRIPTION OF SYMBOLS 1...Cleaning tank, 2...Cleaning liquid, 3...Ultrasonic oscillation source, 3a...Ultrasonic wave, 4.5...Magnet (magnetic field forming means), 6...Magnetic foreign material, M ...Magnetic field, W...Object to be cleaned, 10...Base, 11...Spindle assembly, 11a...Spindle, 11b...Flange portion,
12... Spacer, 13... Magnetic disk, 14.
... Clamp, 15 ... Actuator assembly, 15
a, 15b...bearing, 15c...swing shaft, 1
5d, 15e---Spacer, 15f---Spring,
15g...clamp, 15h...swing arm, 15
i...Cam member, 15J...Step motor, 16
...Magnetic head assembly, 16a...Magnetic head, 1
6b... leaf spring, 16c... head arm, 17.
...Punkin, 18...Cover 19...Sealed room,
20...Dust filter.

Claims (1)

[Scope of Claims] 1. A cleaning device comprising a magnetic field forming means for forming a magnetic field inside a cleaning tank that holds a cleaning liquid or a cleaning gas in which an object to be cleaned is immersed or contained. 2. The cleaning device according to claim 1, wherein the cleaning tank includes an ultrasonic oscillation source inside the cleaning tank, and the cavitation effect caused by the ultrasonic energy of the cleaning liquid promotes removal of foreign matter from the object to be cleaned. 3. The cleaning device according to claim 1, wherein the object to be cleaned is an unassembled component of a magnetic disk device. 4. A magnetic disk device whose components are cleaned using the cleaning device according to claim 1 or 2 prior to the assembly process.