JPH06162761A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To improve the reliability of a magnetic disk device used as an external storage device of a computer. CONSTITUTION:The magnetic disk device consists of a rotatably arranged disk medium 2, a magnetic head 3, a positioner 4 which moves the magnetic head 3 in the radial direction of the disk medium 2 to position it in a prescribed position, a case 1 in which they are set, etc. A cleaning liner 7 which is softly brought into contact with a disk surface 12 of the disk medium 2 to sweep away the dust stuck to this disk surface is arranged on the inside wall of the case 1.

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 used as an external storage device of a computer.

[0002]

2. Description of the Related Art FIGS. 7A and 7B are a schematic plan view showing a structure of a conventional typical magnetic disk device and a sectional view taken along line XX thereof.

A conventional magnetic disk device 40 is shown in FIG.
As shown in (b), a magnetic disk 2 (hereinafter referred to as a disk medium 2) that is driven by a medium driving mechanism (not shown) and rotates in the direction of arrow R with O as the center of rotation, and an arrow T- with O ′ as the center of rotation. The magnetic head 3 arranged at the tip of the positioner 4 that moves in the T ′ direction is provided as a main component. In the figure, 1 is a case in which each of these components is housed, and 5 is an air circulation filter that circulates the air in the case 1 and absorbs dust mixed therein.

This magnetic disk device 40 is equipped with a positioner 4
Is known to move in the direction of the arrow TT 'to guide the magnetic head 3 onto a desired track of the disk medium 2 for recording / reading.

[0005]

In this magnetic disk device, as is clear from FIG. 7, the area occupied by the disk medium 2 is large. Therefore, dust generated in the apparatus adheres to the disk surface 12 of the disk medium 2 occupying a large area and is caught between the magnetic head 3 and the disk medium 2 to damage the disk medium 2 in many cases. Conventionally, in order to prevent this, the air circulation filter 5 is arranged at the corner of the device [Fig.
(See (a)] The internal air was being purified. However,
Recently, a thin disk device having the same shape as an IC memory card has been proposed. Due to the thinning of the device, the flow rate of the air circulating in the device is slowed down, and thus the filtration of the air circulation filter 5 is performed. The phenomenon of reduced function has become more prominent.

Further, in the case of a magnetic disk device which employs a light load type head supporting mechanism for bringing the magnetic head 3 into contact with the disk medium 2, the magnetic head 3 and the disk medium 2 are used.
The phenomenon in which the abrasion powder generated by the sliding contact of the disk adheres to the disk surface 12 and deteriorates the recording / reproducing characteristics often occurs.

According to the present invention, a cleaning liner disposed between the inner wall of the case and the magnetic disk medium is used to wipe off the dust adhering to the magnetic disk medium, thereby realizing a magnetic disk device having its reliability greatly improved. Is what you are trying to do.

[0008]

As shown in FIG. 1, a magnetic disk device 80 according to the present invention comprises a disk medium 2 rotatably arranged, a magnetic head 3 for electromagnetic conversion, and the magnetic head 3. In a magnetic disk device including a positioner 4 that moves the disk medium 2 in the radial direction and positions it at a predetermined position, and a case 1 that houses these, a disk surface 12 of the disk medium 2 is contacted by a soft touch. The cleaning liner 7 for wiping off the dust adhering thereto is arranged on the inner wall of the case 1.

[0009]

This magnetic disk device 80 has a cleaning liner 7 arranged on the inner wall of the case 1 for softly touching the disk surface 12 of the disk medium 2 to wipe off dust adhering thereto. Therefore, the dust adhering to the disk medium 2 can be removed extremely efficiently and safely.

[0010]

The present invention will be described in detail below with reference to the drawings of the embodiments. 1 (a) and 1 (b) are a schematic plan view showing a basic configuration of a magnetic disk device according to the present invention and a sectional view taken along the line AA,
FIGS. 2 (a) and 2 (b) are schematic plan views showing a first embodiment of the present invention and a sectional view taken along the line BB, and FIGS. 3 (a), (b) and (c) are the present invention. FIG. 4A is a schematic plan view showing a second embodiment, a sectional view taken along line CC of FIG.
5B and 5C are a schematic plan view showing a first modified example of the present invention, a cross-sectional view taken along the line DD of FIG. ) Is a schematic plan view showing a second modification of the present invention and a sectional view taken along the line EE thereof, and FIGS. 6A and 6B are schematic plan views showing the third modification of the present invention. The sectional views along the line F-F are shown, respectively, and the same portions as those in FIG. 7 are denoted by the same reference numerals.

As shown in FIGS. 1 (a) and 1 (b), the magnetic disk device 80 according to the present invention includes a disk surface of the disk medium 2.
The cleaning liner 7 that comes into contact with 12 by soft touch to wipe off dust adhering thereto is arranged between the inner wall of the case 1 and the disk medium 2 in a shape shown by a dotted line, for example. In the figure, 3 is a magnetic head and 4 is a positioner.

As the constituent material of the cleaning liner 7,
For example, there are various materials such as non-woven fabric, polish sheet in which abrasive powder impregnated with alumina powder, etc. is hardened with a binder and applied to polyester sheet, lubricant-impregnated non-woven fabric in which non-woven fabric is impregnated with liquid lubricant such as polyfluoroether. However, since each of these has excellent characteristics unique to each, it is decided at the design stage which to use. In addition,
The ones are capable of satisfying both the improvement of the cleaning effect of the surface of the disk medium 2 and the improvement of the sliding durability, and are particularly characterized in that the surface roughness and flatness thereof are easily controlled. Not only the cleaning effect but also the effect of eliminating the imbalance between the removal of the surplus lubricant and the replenishment of the insufficient lubricant, the use of this has the effect of reducing the wear of the surface of the disk medium 2 and the cleaning liner 7. Was confirmed by experiments.

One surface of the cleaning liner 7 is in soft contact with the disk surface 12 of the disk medium 2, and the other surface is attached to the inner wall surface of the case 1 using, for example, an adhesive. Will be placed.

The first embodiment of the present invention will be described below with reference to FIGS. 2 (a) and 2 (b). In the magnetic disk device 80A of the first embodiment, the cleaning liner 7 arranged between the inner wall of the case 1 and the disk medium 2 is concentric with two large and small C-shaped outer peripheral ribs 8a and C-shaped inner peripheral ribs 8b. The C-shaped outer peripheral ribs 8a and the C-shaped inner peripheral ribs 8b arranged above are held by a liner support rib 89 constituted by a plurality of radial ribs 9 mechanically connecting the ribs. is there.

The liner support ribs 89 are held by the liner support ribs 89 because the radial heights 9 of the radial ribs 9 are higher than the heights h of the C-shaped outer peripheral ribs 8a and the C-shaped inner peripheral ribs 8b. The shape of the cleaning liner 7 [in FIG. 2 (a), the cleaning liner 7 is indicated by a chain double-dashed line] has a radial rib 9
Only the part held by is high. Therefore, in the cleaning liner 7 held by the liner support rib 89, only the portion held by the radial rib 9 comes into contact with the disk surface 12 of the disk medium 2 to wipe off dust adhering thereto. It will be. When the first embodiment is applied, the cleaning liner 7 and the disk medium 2 come into limited contact with each other, so that the disk medium 2 is not worn by the sliding contact with the cleaning liner 7, so that the safety is high.

Next, a second embodiment of the present invention will be described with reference to FIGS. 3 (a), 3 (b) and 3 (c). In the magnetic disk device 80B of the second embodiment, the cleaning liner 7 disposed between the inner wall of the case 1 and the disk medium 2 is provided with the C-shaped outer peripheral rib 8a and the C-shaped inner peripheral rib 8b of the liner support rib 89. The disk surface of the disk medium 2 by the pressing force of the pressing spring 10 arranged in the area surrounded by the radial ribs 9
It is characterized by the configuration of contacting with 12.

The pressing spring 10 is made of a spring material such as a thin plate of phosphor bronze for spring, a thin plate of stainless steel, or a thin plate of plastic. This pressing spring 10
Since the height H in the natural state is higher than the height h of the liner supporting rib 89A, the cleaning liner 7 is limited only to the portion pressed by the pressing spring 10 in the arrow P direction. Contact 12 This pressure spring
With the provision of 10, the degree of contact between the cleaning liner 7 and the disk medium 2 becomes more reliable. 10a in FIG. 3 (c)
Is a pressing surface for pressing the disk medium 2, and 10b is a pressing spring 10.
Is a fixing surface for fixing to the case 1, and W is a lateral width of the pressing spring 10. Note that this W is determined according to the width of the disk surface 12 of the disk medium 2.

Next, a first modification of the present invention will be described with reference to FIGS. 4 (a), 4 (b) and 4 (c). The magnetic disk device 88A of the first modified example has an arc-shaped forming portion 17 for each.
The cleaner member 17 provided with a is equipped with a cleaning liner 7A arranged at a plurality of positions.
In the figure, 7n indicates the main body of the cleaning liner 7A, 17b indicates the fixed end of the cleaner member 17, 17c indicates the free end of the cleaner member 17, and W indicates the width of the cleaner member 17. The cleaner member 17 is attached to the cleaning liner 7A by adhering the fixed end 17b side thereof to the main body portion 7n with an adhesive or the like.

The cleaner member 17 contacts the disk medium 2 with a predetermined contact force when the rotation of the disk medium 2 is stopped, but at the same time when the disk medium 2 starts rotating in the arrow R direction, a levitation force in the arrow F direction is generated. Then, it cancels the contact force when the rotation is stopped and almost levitates during steady rotation. As described above, the cleaner member 17 includes the cleaning liner 7A and the disk medium 2
Since the disk surface 12 of this cleaner is selectively contacted only under predetermined conditions, this cleaner member 17
The magnetic disk device 88A equipped with the magnetic disk device 88A has a very low failure rate due to sliding wear of the cleaning liner 7A and the disk medium 2.

Next, a second modification of the present invention will be described with reference to FIGS. 5 (a) and 5 (b). In this second modification, a plurality of points of the cleaning liner 7B made of a flat material are cut into "U-shapes", and the free end side thereof is flapped.
It is characterized in that it is lifted like a flap of an aircraft and brought into contact with the disk surface 12 of the disk medium 2. In the figure, 77 is a flap forming groove for forming the flap portion 27, 1a is an inclined support portion provided on the case 1 side for lifting the flap portion 27, and 28 is a flat portion where the flap portion 27 is not formed. Shown respectively.

This magnetic disk device 88B is intended to control the contact force when the flap portion 27 comes into contact with the disk surface 12 of the disk medium 2 by utilizing the air flow accompanying the disk rotation. The liner 7B contacts the disk medium 2 with a predetermined contact force when the disk medium 2 stops rotating, but at the same time when the disk medium 2 starts rotating in the arrow R direction, it floats in the arrow F direction and is not in contact with the disk medium 2. Be in contact.

Next, a third modification of the present invention will be described with reference to FIGS. 6 (a) and 6 (b). The third modification is the second
By holding the same cleaning liner 7B as described in the modification (see FIG. 5) with a plurality of spacers 11, a minute gap Δ is formed between the cleaning liner 7B and the disk medium 2. is doing. The cleaning liner 7B has a flap portion when the disk medium 2 is stopped.
Although 27 is separated from the disk surface 12, when the disk medium 2 starts to rotate, a suction force is generated between the disk surface 12 and the flap portion 27, the flap portion 27 approaches the disk surface 12, and the disk medium 2 becomes stationary. When rotating, it comes into contact with it with a slight force. Therefore, the contact cleaning of the disk surface 12 is executed only while the disk medium 2 is rotating steadily.

Therefore, if this third modification is applied, the disk surface 12 is brought into contact with each other when the rotation is stopped when the apparatus is stored.
In addition, it is possible to prevent the trouble such as the phenomenon that the lubricant aggregates and the deformation of the cleaning liner 7B. Further, when the cleaning liner 7B is arranged in the shape as in the third modified example, the starting torque of the disk medium 2 is not increased, so that the load on the motor for rotationally driving the disk medium 2 can be reduced. it can.

Although the embodiments and modifications of the present invention have been described above, the present invention is not limited to the use of these embodiments and modifications alone, but it is also possible to use these in combination as appropriate. Needless to say. Although the air circulation filter 5 (see FIG. 7) provided in the conventional magnetic disk device is not provided in the embodiment or the modified example of the present invention, this is because the magnetic disk device according to the present invention has this air in the narrow case 1. This is because it has been proved that the disk medium 2 is not contaminated by dust without mounting the circulation filter 5.

[0025]

As is apparent from the above description, the magnetic disk device according to the present invention is a cleaning liner for efficiently contacting a disk surface of a disk medium with a soft touch to wipe off dust adhering thereto. Since it is arranged between the inner wall of the case and the disk medium, it is possible to maintain the reliability of the magnetic disk device, which has been downsized and where it was difficult to remove dust by ordinary means, for a long period of time. Become.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing a basic configuration of a magnetic disk device according to the present invention and a sectional view taken along the line AA.

FIG. 2 is a schematic plan view showing a first embodiment of the present invention and a sectional view taken along line BB thereof.

FIG. 3 is a schematic plan view showing a second embodiment of the present invention, a cross-sectional view taken along the line C-C, and a perspective view showing one shape example of a constituent member.

FIG. 4 is a schematic plan view showing a first modification of the present invention, a cross-sectional view taken along the line DD of FIG. 4, and a perspective view showing a shape example of a constituent member.

FIG. 5 is a schematic plan view showing a second modification of the present invention and a sectional view taken along the line EE thereof.

FIG. 6 is a schematic plan view showing a third modified example of the present invention and a cross-sectional view taken along line FF thereof.

FIG. 7 is a schematic plan view showing a structure of a conventional typical magnetic disk device and a cross-sectional view taken along line XX thereof.

[Explanation of symbols]

1 Case 1a Inclined support 2 Disk medium 3 Magnetic head 4 Positioner 5 Air circulation filter 7, 7A, 7B Cleaning liner 7n Main body 8a C type outer peripheral rib 8b C type inner peripheral rib 9 Radial rib 10 Pressing spring 10a Pressing surface 10b Fixed surface 12 Disk surface 17 Cleaner member 17a Arc-shaped forming part 17b Fixed end 17c Free end 27 Flap part 28 Flat part 77 Flap forming groove 40, 80, 80A, 80B, 88A, 88B, 88C Magnetic disk unit 89, 89A Liner support Rib O Center of rotation of disk medium Center of rotation of O'positioner Δ Gap

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoji Kasamatsu 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (72) Inventor Yukio Nakamura 1015, Kamedotachu, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited ( 72) Inventor Yasuyuki Sagara 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited

Claims (2)

[Claims] 1. A magnetic disk (2) rotatably arranged.
A magnetic head (3), a positioner (4) that moves the magnetic head (3) in the radial direction of the magnetic disk (2) to position it at a predetermined position, and a case (1) that houses them. In the constructed magnetic disk device, a cleaning liner (7) for contacting the disk surface (12) of the magnetic disk (2) with a soft touch to wipe off dust adhering thereto is provided in the case (1). A magnetic disk device characterized by being arranged on an inner wall. 2. An inner wall of the case (1) and a magnetic disk
(2) The cleaning liner placed between the magnetic disk (2)
2. The magnetic disk device according to claim 1, wherein the magnetic disk device is configured to come into contact or non-contact with the magnetic disk (2) in conjunction with the rotating operation of the magnetic disk.