JPH0579796U - Fixed magnetic disk unit - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a fixed magnetic disk device which needs to keep the internal air clean, and has a dust collecting mechanism having a high dust collecting effect and is small in size. The purpose is to provide a device. A filter having a surface facing in parallel with the recording surface of the magnetic disk 1 is provided so that the air flow accompanying the rotation of the magnetic disk contacts the filter surface and dust is collected on the filter surface. To configure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fixed magnetic disk device, and more particularly to a fixed magnetic disk device that needs to keep the internal air clean.

[0002]

[Prior Art]

 In the conventional fixed magnetic disk device, the magnetic disk is rotated at a high speed and the magnetic head performs recording and reproduction. The magnetic head floats slightly above the surface of the magnetic disk due to the air flow caused by the rotation of the magnetic disk, and performs recording and reproduction without contact. The distance between the magnetic head and the magnetic disk is very small, and it becomes a problem if minute dust is sandwiched between them. For this reason, a filter is provided in the device to filter and clean the air. This filter is provided in a part of the device near the outer circumference of the magnetic disk, and the air flow accompanying the rotation of the magnetic disk is guided to this filter to filter the air inside the device. Further, a rectifying plate or the like for efficiently guiding the air flow to the filter is provided in the device.

[0003]

[Problems to be solved by the device]

 In order to improve the filtering efficiency of air by the filter, it is conceivable to widen the cross-sectional area of the filter through which the air passes, or devise a straightening vane to send the air to the filter efficiently. However, in order to increase the cross-sectional area of the filter, the space is required, which causes a problem of increasing the size of the device. Further, the current plate for efficiently guiding air to the filter has a problem that the structure of the device is complicated, resulting in an increase in size and weight of the device.

Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide a miniaturized fixed magnetic disk device having a dust collecting mechanism having a high dust collecting effect.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the invention of claim 1 is a fixed magnetic disk device having a dust collecting mechanism for keeping the internal air clean by filtering an air flow generated by the rotation of the disk with a filter, The filter has a collection surface facing away from the surface of the disk, and the air is brought into contact with the collection surface to collect dust on the surface of the collection surface.

Further, in the invention of claim 2, the filter is provided on the front surface side and the back surface side of the surface of the disk.

According to a third aspect of the present invention, there is provided a fixed magnetic disk device having a dust collecting mechanism for keeping the internal air clean by filtering the air flow generated by the rotation of the disk with the filter, wherein the filter is The disk has a collecting surface facing the outer circumferential end along the outer circumference of the disk, and the dust is captured on the surface of the collecting surface by bringing the airflow into contact with the collecting surface.

[0008]

[Action]

 According to the first aspect of the present invention, the collecting surface facing the surface of the disc in a spaced manner is in contact with the air flow generated by the rotation of the disc and collects the moving dust.

According to the second aspect of the present invention, the configuration in which the filters are provided on the front surface side and the rear surface side of the disk increases the contact area between the filter and the air flow, and increases the dust collecting area.

In the invention of claim 3, the collecting surface facing the outer peripheral end along the outer periphery of the disk comes into contact with the air flow due to the rotation of the magnetic disk, and collects the moving dust by the air flow. .. Further, in the structure in which the filter is arranged along the outer circumference of the disc, the air flow is efficiently brought into contact with the filter surface by the centrifugal force acting on the air moving in the rotation direction of the disc as the disc rotates.

[0011]

【Example】

 FIG. 1 is a perspective view illustrating the principle of the present invention. A magnetic head 3 attached to the tip of a VCM arm assembly 2 is located on the surface of the magnetic disk 1 on which information is recorded. Since information is generally recorded on both sides of the disk 3, the magnetic heads 3 are provided on both sides of the disk 1. Therefore, the VCM arm assembly 2 has a shape in which the tip portion is divided into two and the disk 1 is sandwiched. By rotating the VCM arm assembly 2, the magnetic head 3 is movable in the radial direction of the disk 1. A filter 4 is arranged so as to cover the disc 1 at a position separated from the surface of the disc 1 by a predetermined distance. The surface of the filter 4 facing the disc 1 is parallel to the disc 1 and is close enough to not come into contact. When performing a recording / reproducing operation, the disc 1 rotates at a high speed in the direction of arrow A in FIG. ..

With this rotation, the air along the surface of the disk 1 starts moving along with the rotation of the disk 1, and an air flow that rotates along the surface of the disk 1 is generated. Therefore, this air flow comes into contact with the surface of the filter 4 facing the disk 1. When dust is present near the disk 1, the dust is carried by the air flow and contacts the surface of the filter 4. Then, the dust will be collected on the surface of the filter 4.

According to the present invention, the amount of dust collected per unit area of the filter is smaller than that of the conventional mechanism that collects dust by passing an air flow through the filter. However, since the area of the filter that comes into contact with the air flow can be made large, the amount of dust collected in the entire filter will be larger than in the conventional case.

FIG. 2 shows a first embodiment of the fixed magnetic disk device of the present invention, FIG. 2 (A) is a horizontal sectional view thereof, and FIG. 2 (B) is a vertical sectional view thereof. A motor 13 for rotating a disk 12 is attached to a base 11 of a fixed magnetic disk device (hereinafter referred to as a device) 10, and the disk 12 is fixed on the motor 13 by a clamper 14. The magnetic head 15 is fixed to the tip of the VCM arm assembly 16 and is located on the recording surface of the disk 12. A filter 17 for collecting dust, which is a charged air filter made of, for example, polypropylene non-woven fabric, is arranged between the disk 12 and the base 11 and fixed to the base 11.

The filter 17 has a substantially semicircular thin plate shape on the side opposite to the side where the VCM arm assembly 16 is arranged so as not to interfere with the movement of the magnetic head 15 and the VCM arm assembly 16. The disk 12, the motor 13, the clamper 14, the VCM arm assembly 16 and the like on the base 11 are housed inside a cover 18. The base 11 of the apparatus 10 is provided with a breath hole 19 which is a small hole to connect the inside and outside of the apparatus to each other and maintain the air pressure inside the apparatus equal to the atmospheric pressure outside.

In the apparatus having the above-described structure, when the motor 13 rotates and the disk 12 rotates in the direction of arrow A, an air flow is generated along the surface of the disk 12 (see hollow air flows B and C in the figure). ). This airflow rotates in the same direction as the rotation direction of the disk 1, and a flow is also generated which hits the inner wall of the cover 18 by the centrifugal force and returns in the radial direction of the disk 12. Since the gap between the disk 12 and the collecting surface 17a of the filter 17 is narrow, the flow velocity is high, and a large amount of air passes while contacting the collecting surface 17a of the filter. At this time, dust in the vicinity of the disk 12 or in the device 10 is carried by this air flow, and part of it is brought into contact with the collecting surface 17a of the filter to be caught.

The collecting surface 17a of the filter 17 has such a large area that it covers almost half of one surface of the disk 12, and even if the collecting efficiency of dust per unit area of the filter is low, the entire filter is small. The amount of dust collected in the area is larger than in the conventional case. Further, since the filter 17 is provided in the space between the disk 12 and the base 11, it is not necessary to provide a place for disposing the filter or a mechanism for fixing it. By providing the breath hole 19 in a portion of the base 11 where the filter 17 is arranged, the filter 17 can also serve as a breath hole filter.

In the first embodiment described above, the filter 17 has an area that is substantially half of one side of the disk 12, but it can be arranged over the entire surface of the disk 12 except for the movable range of the VCM arm assembly 16. Further, if they are arranged on both sides of the disk 12, the dust collecting area can be further widened.

Next, a second embodiment of the present invention will be described with reference to FIG. 3A is a horizontal sectional view thereof, and FIG. 3B is a vertical sectional view thereof. In FIG. 3A, the same parts as those shown in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted. In the second embodiment, instead of the filter 17 in the first embodiment, a filter 21 having a collecting surface 21a facing the outer peripheral end of the disk 12 is provided. The filter 21 is provided along the inner surface of the portion of the base 11 that accommodates the disk 12 over approximately half the circumference of the disk 12.

When the disk 12 rotates in the direction of arrow A, a centrifugal force acts on the air that rotates in association with it, and the disk 12 rotates while moving in the outer peripheral direction of the disk 12 (the direction of the hollow air flow in the figure is indicated by arrow B). Indicated). Then, in the portion where the filter 21 is located, the airflow flows while contacting the collecting surface 21a of the filter. Therefore, the dust in the vicinity of the disk 12 is also carried by this air flow and comes into contact with the collection surface 21 of the filter 21 to be captured. Further, the centrifugal force also acts on the dust itself carried by the air flow, and the dust is actively moved toward the filter 21 and captured.

Since the filter 21 is provided over approximately half of the outer circumference of the disk 12, the dust collection area is wide, and although the collection efficiency per unit area is low, the total dust collection amount is smaller than that of the conventional one. You can do a lot. Further, since the filter 21 is arranged in the space between the conventional disk outer peripheral portion and the inner surface of the base, it is not necessary to provide a place for installing the filter 21 or a fixing mechanism.

By using the filter of the first embodiment and the filter of the second embodiment in combination, it is possible to obtain a fixed magnetic disk device having a wider dust collecting area.

[0023]

[Effect of the device]

 According to the first aspect of the invention, dust is brought into contact with the collecting surface of the filter and collected by the airflow generated by the rotation of the disk. Although the amount of dust collected per unit area of the filter is small compared to the method of positively passing air through the filter, the collection area can be significantly widened, so the total amount of collected dust is large. can do. Further, since it is not necessary to provide a part for installing a filter or a rectifying plate for rectifying the air flow, it is possible to realize the miniaturization of the device. Since the filter for the breath hole can also be used as the filter for collecting dust, the filter for the breath hole can be omitted and the number of parts of the device can be reduced.

According to the invention of claim 2, the collecting surface of the filter can be increased, and the amount of dust collected can be increased.

According to the third aspect of the invention, dust is brought into contact with the collecting surface of the filter and collected by the air flow generated by the rotation of the disk and the centrifugal force thereof. The amount of dust collected per unit area of the filter is smaller than that of the method in which air is actively passed through the filter, but the collection area can be greatly increased, increasing the total amount of dust collected. be able to. Further, since it is not necessary to specially provide a part for installing the filter or a rectifying plate for rectifying the air flow, the miniaturization of the device can be realized.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating the principle of the present invention.

FIG. 2 is a diagram illustrating a first embodiment of the present invention.

FIG. 3 is a diagram illustrating a second embodiment of the present invention.

[Explanation of symbols]

 1, 12 disk 2, 16 VCM arm assembly 3, 15 magnetic head 4, 17, 21 filter 10, 20 fixed magnetic disk device 11 base 13 motor 14 clamper 17a, 21a collecting surface 18 cover 19 breath hole

Claims (3)

[Scope of utility model registration request] 1. A fixed magnetic disk device having a dust collecting mechanism for keeping the internal air clean by filtering an air flow generated by the rotation of the disk with a filter, wherein the filter is separated and opposed to the surface of the disk. A fixed magnetic disk device having a collecting surface for collecting dust on the surface of the collecting surface by bringing the air flow into contact with the collecting surface. 2. The fixed magnetic disk device according to claim 1, wherein the filter is provided on a front surface side and a back surface side of a surface of the disk. 3. A fixed magnetic disk device having a dust collecting mechanism for keeping the internal air clean by filtering the air flow generated by the rotation of the disk with a filter, wherein the filter extends along the outer periphery of the disk. A fixed magnetic disk device having a collection surface facing the outer peripheral end, and collecting the dust on the surface of the collection surface by bringing the air flow into contact with the collection surface.