JP2551951B2 - Floating dust collection method for storage disk device - Google Patents

Description

DETAILED DESCRIPTION [Table of Contents] Outline Industrial field of application Conventional technology (Fig. 3) Problems to be solved by the invention (Fig. 4) Means for solving problems (Fig. 1) Working Example (Fig. 2) Effect of the invention [Overview] A method for collecting floating dust in a magnetic disk enclosure for analyzing floating dust in a magnetic disk enclosure, in which floating dust in the enclosure is attached to a head and collected. In a method of collecting floating dust in the enclosure of a magnetic disk device accommodating a magnetic disk, a magnetic head, and a carriage in the enclosure, a taper end type head is used as the magnetic head. A negative pressure portion was formed at the end portion of, and the floating dust in the enclosure was made to adhere to the end portion.

[Industrial applications]

The present invention relates to a method of collecting floating dust in a storage disk device for analyzing floating dust in a storage disk enclosure.

The magnetic disk device floats a magnetic head by the rotation of the magnetic disk to record / reproduce information.

In accordance with the recent demand for high density, the flying height of the magnetic head has been reduced to 0.2 μm or less.

Therefore, the head crash easily occurs even with fine floating dust.

Therefore, in order to maintain the reliability of the apparatus, it is necessary to investigate the floating dust that causes the head crash, investigate the source of the floating dust, and prevent the generation of the floating dust.

Therefore, an effective method for collecting floating dust is desired.

[Conventional technology]

 FIG. 3 is an explanatory diagram of the magnetic disk device.

In the magnetic disk device, a carriage 3 and a spindle motor 5 are provided on a base 4a, and a magnetic disk 1 is provided on a spindle shaft 5a of the spindle motor 5. The carriage 3 seeks the magnetic head 2 to move the magnetic disk 1,
The magnetic head 2 and the carriage 3 have a base 4a and a cover 4b.
It is housed in an enclosure 4 consisting of.

The air inside the enclosure 4 flows at high speed due to the rotation of the magnetic disk 1, and floating dust from various sources flies.

Conventionally, it was usual to collect floating dust from the surface of the magnetic disk 1.

[Problems to be solved by the invention]

By the way, relatively large suspended dust is generally captured by trap means such as a filter, and relatively small suspended dust is not captured.

Such small floating dust rarely causes a head crash with one floating dust, but FIG. 4 (A)
As shown in FIG. 4, small dust (DST) adheres to the slider surface 20 of the magnetic head 2 and accumulates as shown in FIG. 4 (B).

As a result, as shown in FIG. 4 (B), the flying height decreases from W to W ', the flying balance is lost, and the flying posture changes.

Therefore, when acceleration is applied at the start and end of the seek of the head, a head crash occurs in which the magnetic head 2 contacts the magnetic disk 1.

The adhered floating dust DST is brought into contact with the magnetic head 2 by the CSS (contact start / stop) at the time of stop as shown in FIG. 4 (C), and the slider surface 20 of the magnetic head 2 is just cleaned. .

Such small floating dust DST is
Since it is flying in the air without falling into the air, there is a problem that it cannot be collected from the surface of the magnetic disk 1.

Therefore, the floating dust DST attached to the surface of the magnetic head 2 cannot be analyzed, and the source thereof cannot be determined.
There was a situation in which measures could not be taken for head crashes.

It is an object of the present invention to provide a method of collecting floating dust in a storage disk device, which can collect floating dust in an enclosure by attaching it to a head.

[Means for solving problems]

 FIG. 1 is an explanatory view of the principle of the present invention.

The present invention uses the taper end type head 2a in which the end portion 21 of the slider surface 20 has a taper, the end portion 21 of the head 2a has a negative pressure, and a viscous agent is applied to the negative pressure portion to positively The floating dust DST is attached to the end portion 21 to collect the floating dust DST.

The head 2a may be a dummy head having no core or a magnetic head having a core.

[Action]

In the present invention, since the floating dust DST attached to the head 2 has a bad influence, the floating dust DST is attached to the head 2a and collected.

Then, by forming a taper on the end portion 21 of the head 2a, and further by applying a viscous agent to the negative pressure portion of the end portion 21, the negative pressure and the floating dust DST is positively attached by the viscous agent, and Head 2 on magnetic disk 1 by CSS
Since the end portion 21 does not contact even if a comes into contact, the adhered floating dust does not remain and does not scatter in the air, so that stable and reliable collection can be performed.

As a result, the suspended dust DST can be analyzed, the source of the dust can be investigated, and countermeasures can be taken.

Therefore, head crash prevention measures and floating dust
It is possible to take measures against deterioration of recording / reproducing characteristics due to DST adhesion.

〔Example〕

 FIG. 2 is an explanatory view of an embodiment of the present invention.

Floating dust will be collected in the running test of the prototype and the sample machine at the time of lot change to ensure reliability.

That is, at the stage of trial manufacture and modification, the design and material selection of each mechanism part is performed so that floating dust is not generated, but the flying height is 0.2
This is because submicron-order dust becomes a problem in the order of microns, and it is difficult to predict the dust that adheres to the head and adversely affects the dust.

In this running test, as shown in FIG. 2 (A), the head 2a having a taper formed on the front portion 22 and the end portion 21 is attached to the carriage 3 and the spindle motor 5
Is rotated to rotate the magnetic disk 1, and a running test is performed.

As shown in FIG. 2 (B), the pressure distribution of the head 2a is a positive pressure on the front portion 22 and the slider surface 20, and thereby the levitation force from the magnetic disk 1 against the gimbal is obtained.

On the other hand, the end portion 21 has a negative pressure, and the floating dust DST is
It adheres to the slider surface 20 and is pulled by negative pressure, and positively adheres to the end portion 21.

After the test, even if the head 2a contacts the magnetic disk 1 by CSS operation, the adhered suspended dust DST on the slider surface 20 is scattered, but the adhered suspended dust DST on the end portion 21 does not contact the magnetic disk 1. So it remains.

By removing the head 2a from the apparatus and analyzing the amount and the content of the dust DST adhering to the end portion 21, it is possible to judge whether or not this is the case.

If there is a problem, identify the source from the analysis results of the attached dust DST and change to a structure or material that produces less dust.

The head 2a may be a dummy head having no core or a magnetic head having a core.

With a magnetic head, it is possible to collect the adhered dust DST while measuring the recording / reproducing characteristics, and analyze the floating dust that deteriorates the recording / reproducing characteristics.

In the above-mentioned embodiment, the head 2a is replaced during the running test, but if the magnetic head to be originally mounted is constructed as shown in FIG. 2, it is not necessary to replace it.

Further, if a viscous agent, for example, the same lubricant as that applied to the magnetic disk 1 is applied to the end portion 21 of the head 2a, the floating dust is more likely to adhere, and the floating dust can be collected in a wider area. It will be possible.

If the same viscous agent as the lubricant for the magnetic disk 1 is used as the viscous agent, even if the viscous agent applied to the end portion 21 falls onto the magnetic disk 1, the magnetic disk 1 is not adversely affected.

Although the present invention has been described with reference to the embodiments, the present invention can be variously modified according to the gist of the present invention, and these modifications are not excluded from the present invention.

〔The invention's effect〕

As described above, the present invention has the following effects.

Since the negative pressure portion is provided in the head and the viscous agent is applied to the negative pressure portion, the floating dust in the enclosure is positively attached, so that the floating dust can be collected safely and reliably.

Since the floating dust is collected by the head, only the floating dust that adversely affects the characteristics of the head can be collected, and the dust that adversely affects the characteristics of the head can be easily analyzed.

[Brief description of drawings]

FIG. 1 is an explanatory view of the principle of the present invention, FIG. 2 is an explanatory view of an embodiment of the present invention, FIG. 3 is an explanatory view of a magnetic disk device, and FIG. 4 is an explanatory view of problems of a conventional technique. In the figure, 1 ... magnetic disk, 2 ... magnetic head, 2a ...
Head, 21 …… End part.

Claims (1)

(57) [Claims] 1. To analyze suspended dust in an enclosure (4) of a storage disk device containing a storage disk (1), a head (2) and a carriage (3) in the enclosure (4). In the method for collecting the suspended dust, a negative pressure portion is formed in an end portion (21) of the head (2a),
A method for collecting floating dust in a storage disk device, characterized in that a floating agent in the enclosure (4) is attached to the end portion (21) by applying a viscous agent to the negative pressure portion.