JPH08293191A - Disk drive device - Google Patents

Abstract

PURPOSE: To prevent the circulation of an airflow contaminated with grease, etc., by providing a wind direction plate for generating an airflow in the direction of canceling a pressure difference generated in a box when disks under a housable number of them are mounted. CONSTITUTION: A disk housing space 4 for housing recording disks 3 on a disk drive is formed by a base member 1 and a cover member 2. A rotor hub 10 is freely rotatably supported via bearings 9 by a shaft 7 fixed to the base member 1, and the recording disks 3 stacked via spacers 16 are held by a hub 11. The rotor hub 10 is rotationally driven by a rotor manet 13 fixed via a yoke 12 to the hub 11 with electromagnetic interaction with a stator 15 provided in an annular recessed part 5. Then, the wind direction plate 19 is provided on the surface of the cover member 2 opposite to the recording disk 3 to generate an airflow to a central part of the rotor hub 10, thus canceling a pressure difference caused by mounting a small number of recording disks 3 nearer to the cover member 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive device for rotationally driving a recording disk such as a magnetic disk.

[0002]

2. Description of the Related Art A disk drive device shown in FIGS. 5 and 6 is for rotatively driving a magnetic disk, for example. , A disk housing space d of the drive means c for rotating the magnetic disk is defined. A shaft e is fixed to the center of an annular recess a ′ provided in the base member a, and a rotor hub g is rotatably supported by the shaft e via a pair of bearings f, f.
The rotor hub g includes a hub h and a rotor yoke i, and a rotor magnet j is provided inside the rotor yoke i.
Is attached. As shown in FIG.
A disk k is mounted via a spacer l, and a clamp m is screwed to the hub h so that it is tightly fixed to the hub h. The rotor hub g is rotationally driven by electromagnetic interaction between the stator n provided on the base member c and the rotor magnet j. Further, the present drive device can be changed to a two-disk mounting type as shown in FIG. 6 according to the purpose of use, and is fixed by the spacer 1 and the clamp m as in the case of four disks. In this case, it is usual that the two disks k are mounted close to the cover member b side due to the common use of the clamp m and the configuration on the head actuator side.

[0003]

In the disk drive device having such a structure, in the case where two disks are mounted as shown in FIG. 6, the disk is accommodated when the rotor hub g is rotationally driven. The pressure distribution in the space d changes. That is, since the two disks k are mounted close to the cover member b side, the pressure o in the space between the cover member b and the upper disk k and the base member a
And the pressure p in the space between the lower disk k and
The relationship is o <p. As a result, as shown by the arrow in FIG. 6, an air flow that flows from the lower side to the upper side inside the driving means c is generated, and along with this, an air flow that flows from the upper side to the lower side in the disk storage space d is generated. There has been a problem that unclean air containing grease and the like in the pair of bearings f, f flows into the disc housing space d together with the air flow.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a disk drive device capable of keeping a disk accommodation space clean. .

[0005]

In order to achieve the above object, a disk drive device of the present invention is provided with a drive means for rotating a recording disk within a closed space defined by a base member and a cover member. The driving means comprises a stationary member fixed to the base member and a rotating member rotatably supported by the stationary member via bearing means, and the rotating member has a plurality of maximum specified numbers in the axial direction. A disk drive device having a height at which the recording disks can be mounted in a stacked state, and configured to mount a number of the recording disks smaller than the maximum specified number on the rotating member, On the rotating member, a smaller number of recording disks than the maximum specified number of recording disks are mounted close to the cover member side. The portion facing the disc is provided with an air flow direction plate that forms an air flow that relieves the pressure difference between the upper portion and the lower portion in the closed space by relative rotation with the recording disc. Is.

In order to achieve the above object, the disk drive device of the present invention is provided with a drive means for rotating the recording disk within a closed space defined by the base member and the cover member. The driving means includes a stationary member fixed to the base member and a rotating member rotatably supported by the stationary member via bearing means, and the rotating member has a plurality of maximum specified number of the recording disks in the axial direction. A disk drive device having a height capable of being mounted in a superposed state and configured to mount a smaller number of the recording disks than the maximum specified number on the rotating member, wherein the rotating member is , A number of the recording discs that are smaller than the maximum prescribed number are loaded close to the cover member side, and a dummy disc is attached to the base member side of the rotating member. A wind direction plate that is attached and that forms an air flow that relieves the pressure difference between the upper part and the lower part in the closed space by rotation is provided on the surface of the dummy disk on the side of the base member. It is a feature.

In the disk drive device, it is preferable that a plurality of the wind direction plates are arranged at positions symmetrical with respect to the rotation center of the rotating member.

[0008]

When a number of recording disks smaller than the maximum specified number are loaded on the rotating member toward the cover member side, the pressure in the disk containing space becomes unstable when the rotating member rotates, and the disk is driven inside the disk containing space. An air flow is circulated within the means. In the disk drive device of the first invention described above, since the wind direction plate is arranged in the portion of the cover member that faces the recording disk, the rotation of the rotating member causes the air flow toward the center of the driving means, that is, the above-mentioned. It is possible to significantly reduce the flow of air in the direction opposite to the flow of the generated air and the inflow of air inside the drive means into the disk housing space.

Further, in the disk drive device according to the second aspect of the invention, since the dummy disk having the air flow direction plate is mounted on the base member side of the rotating member, the rotation of the rotating member causes air to move in the outer peripheral direction. It is possible to generate an air flow and generate an air flow in a direction that reduces the air flow flowing in the disk housing space and the drive means.

[0010]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a first embodiment, and is a cross-sectional view showing a part of a disk drive device for rotationally driving a magnetic disk, for example. In FIG. 1, reference numeral 1 denotes a base member which is a base portion of the present disc drive apparatus, and a cover member 2 defines a closed space for accommodating a recording disc 3, that is, a disc accommodating space 4. The base member 1 is a housing that constitutes the entire disk drive device, and forms a stationary member.

The base member 1 is formed with an annular recess 5 which is lowered one step downward, and a flexible circuit board 6 is mounted on the bottom surface thereof. A shaft 7 is fixed to the center of the annular recess 5, and the cover member 2 is fixed to the shaft 7 with screws 8. A pair of bearings 9, 9 are mounted on the outer peripheral surface of the shaft 7, and the rotor hub 10 is rotatably supported via the pair of bearings 9, 9. The rotor hub 10 is a rotating member, and is composed of a hub 11 and a rotor yoke 12, and a rotor magnet 13 is attached inside the rotor yoke 12.

A labyrinth cap 14 is interposed above the upper bearing 9 between the shaft 7 and the hub 11. The labyrinth cap 14 is mounted on the inner peripheral surface of the hub 11 so that a slight radial gap is formed between the inner peripheral surface of the labyrinth cap 14 and the outer peripheral surface of the shaft 7. The rotor hub 10 is rotationally driven by electromagnetic interaction between the stator 15 provided in the annular recess 5 and the rotor magnet 13 facing the stator 15.

Two recording disks 3, which are smaller than the maximum specified number (four), are mounted on the hub 11 by a spacer 16 toward the cover member 2. Then, each disk 3 is tightly fixed to the hub 11 by screwing the clamp 17 to the hub 11 with the screw 18 so as to press on the upper recording disk 3.

FIG. 2 is a bottom view of the cover member 2. A plurality of wind direction plates 19 are adhered to the portion of the cover member 2 facing the recording disk 3 (the portion indicated by the broken line) on the side of the disk housing space 4 side. Fixed with adhesive or double-sided tape.
The wind direction plates 19 are arranged at equal intervals at positions symmetrical with respect to the center of rotation of the rotor hub 10, and rotate toward the center of the rotor hub 10 as indicated by an arrow by the relative rotation with the recording disk 3. Form a stream. As described with reference to FIG. 6, when a smaller number of recording discs than the maximum prescribed number are mounted closer to the cover member side, the pressure in the disc accommodating space is not constant when the rotor hub rotates. That is, the pressure in the space between the cover member and the upper recording disk becomes smaller than the pressure in the space between the base member and the lower recording disk,
The air flow indicated by the arrow is generated. However, since an inwardly-wound air flow is generated between the cover member 2 and the upper disc 3 by the wind direction plate 19 against the flow of the air flow, the air passing through the disc accommodating space 4 and the drive means. The flow distribution can be suppressed, and the pressure distribution in the disk housing space 4 can be kept substantially constant.

FIGS. 3 and 4 show a second embodiment of the first embodiment.
1 and 2 which are the embodiments of the present invention, the same reference numerals indicate the same or corresponding ones. FIG. 3 is a cross-sectional view showing a part of a disk drive device that rotationally drives a magnetic disk, for example. The description of the main structure is as shown in FIG. Two recording disks 3 attached to the hub 11 so as to be close to the cover member 2 side
A disk-shaped dummy disk 20 is mounted on the lower side, and a plurality of wind direction plates 21 are fixed to the surface of the dummy disk 20 on the base member 1 side with an adhesive or a double-sided tape. FIG. 4 is a bottom view of the dummy disk 20, and the wind direction plates 21 are arranged at a plurality of positions equidistantly symmetrical with respect to the rotation center of the rotor hub 10 which is a rotating member, and are indicated by arrows as the rotor hub 10 rotates. Such an air flow in the outer peripheral direction is formed. As described in the first embodiment,
When a smaller number of recording disks 3 than the maximum specified number are mounted on the hub 11 so as to be closer to the cover member 2 side, the recording disk 3 between the lower recording disk 3 and the base member 1 moves from the disk storage space 4 into the drive means. An air flow is generated, but since an externally wound air flow that opposes this air flow is generated,
It is possible to suppress the flow of the air flow passing through the disk housing space 4 and the drive means and keep the pressure distribution in the disk housing space substantially constant.

Although the embodiment of the disk drive device according to the present invention has been described above, the present invention is not limited to such an embodiment, and various changes and modifications can be made without departing from the scope of the present invention. . For example, the wind direction plate provided on the cover member 2 or the dummy disk 20 is not limited to fixing with an adhesive or a double-sided tape, and may be processed and formed at the same time when the cover member 2 or the dummy disk 20 is processed.

[0017]

Since the present invention is constructed as described above, it has the following effects. According to the first aspect of the present invention, since the cover member 2 is provided with the air flow direction plate 19, the air flow directed toward the center of the rotor hub 10 by the relative rotation between the cover member 2 and the upper disc 3 relative to the rotor hub 10. Is formed. Since this air flow flows in a direction counter to the direction of the air flow flowing from the drive means to the outer peripheral direction, which is generated by the pressure difference in the disk storage space 4, the flow of the air flow passing through the disk storage space 4 and the drive means is suppressed. Therefore, the pressure distribution in the disk housing space 4 can be kept constant. Therefore, it is possible to prevent the grease and the like in the pair of bearings 9 and 9 from flowing into the disc housing space 4 together with the air flow, so that the disc housing space 4 is always kept clean and the surface of the recording disc 3 becomes dirty. Disappears.

Further, according to the second invention, since the dummy disk 20 having the wind direction plate 21 on the surface on the base member 1 side is mounted below the lower disk 3, the dummy accompanying the rotation of the rotary member is mounted. Due to the rotation of the disk 20, an air flow from the airflow direction plate 21 to the outer peripheral direction is formed between the lower disk 3 and the base member 1. This air flow flows in a direction opposite to the direction of the air flow from the disk storage space 4 toward the drive means, which is generated by the pressure difference in the disk storage space 4, so that the flow of the air flow through the disk storage space 4 and the drive means. Therefore, the pressure distribution in the disk housing space 4 can be kept constant. Therefore, the pair of bearings 9,
The grease or the like in 9 is accompanied by the air flow, and the disk accommodation space 4
Since it is prevented from flowing into the disk, the disk housing space 4 is always kept clean, and the surface of the recording disk is prevented from becoming dirty.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a disk drive device according to the present invention.

FIG. 2 is a bottom view of the cover member in FIG.

FIG. 3 is a sectional view showing a second embodiment of the disk drive device according to the present invention.

FIG. 4 is a bottom view of the dummy disk in FIG.

FIG. 5 is a sectional view showing a conventional disk drive device.

6 is a cross-sectional view showing a case where less than the maximum specified number of recording disks are mounted in the disk drive device of FIG.

[Explanation of symbols]

 1 Base Member 2 Cover Member 3 Recording Disc 4 Disc Storage Space 10 Rotor Hub 13 Rotor Magnet 15 Stator 19 Wind Direction Plate 20 Dummy Disk 21 Wind Direction Plate

Claims (3)

[Claims] 1. A drive means for rotating a recording disk is provided in a closed space defined by a base member and a cover member, wherein the drive means includes a stationary member fixed to the base member, and And a rotating member rotatably supported by a stationary member via bearing means, wherein the rotating member has a height such that a plurality of maximum specified number of the recording disks can be mounted in an overlapping state in the axial direction, In a disc drive device configured to mount a smaller number of recording discs than the maximum specified number on a rotating member, the rotating member brings the recording discs smaller than the maximum specified number toward the cover member. Is mounted on the drive means side of the cover member, and is closed by a relative rotation with the recording disk at a portion facing the recording disk. Disc drive apparatus louvers is provided for forming an air flow to relieve the pressure difference between the top and bottom of the between. 2. A drive means for rotating a recording disk is provided in a closed space defined by a base member and a cover member, wherein the drive means includes a stationary member fixed to the base member, and And a rotating member rotatably supported by a stationary member via bearing means, wherein the rotating member has a height such that a plurality of maximum specified number of the recording disks can be mounted in an overlapping state in the axial direction, In a disk drive device configured to mount a smaller number of recording disks than the maximum specified number on a rotating member, the rotating member has a smaller number of recording disks than the maximum specified number on the cover member side. The dummy disc is mounted on the base member side of the rotating member, and the dummy disc is mounted on the base member side of the dummy disc. In, rotated by a disk drive device where the wind direction plate is provided for forming an air flow to relieve the pressure difference between the top and bottom of the closed space. 3. The disk drive device according to claim 1, wherein a plurality of the wind direction plates are arranged at positions symmetrical with respect to a rotation center of the rotating member.