JPH11297037A - Fixed magnetic disk apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce vibration generated on a magnetic disk which is rotating at a high speed in a magnetic disk apparatus. SOLUTION: A fixed magnetic disk apparatus has a plurality of magnetic disks 2, a spindle motor to rotate the disks and a case 1 for accommodating these elements. A spiral groove 12 is formed on a disk clamper on the rotor of spindle motor to positively generate high speed air flow into the space among magnetic disks. The wall surface 21 of the case 1 provided opposed to the recording surface of the magnetic disk 2 is formed in the shape nearest to the recording surface at the area near the disk clamper 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixed magnetic disk device for recording and reproducing digital information, and more particularly to a fixed magnetic disk device for coping with high density and high speed.

[0002]

2. Description of the Related Art In recent years, with the spread of personal computers and their use of multimedia, there has been a strong demand for improvements in the performance required for a built-in fixed magnetic disk device, particularly, in recording density and data transfer speed. For example, AV data (Au
When dio visual data is handled, the storage amount is required to be several tens to hundreds of times that when not handling AV data. Moreover, since it is required to handle data seamlessly, it is necessary to speed up data transfer as compared with the case where the data is not AV data.

[0003] Fixed magnetic disk drives have begun to be used not only in computers but also in a wide variety of digital devices, such as storage devices for surveillance cameras, non-linear editing machines for video, and portable still cameras and video cameras.
High recording density and high-speed performance are increasingly regarded as important as the performance of fixed magnetic disk drives.

Efforts have been made by many engineers to improve the recording density and data transfer speed of fixed magnetic disk drives. Advances in magnetic heads (hereinafter simply referred to as heads) and magnetic disks (hereinafter simply referred to as disks), narrower gaps between heads and disks, higher speed actuators for driving head sliders, and higher rotation speeds of spindle motors In recent decades, the areal recording density has been increased to about 100 times. In order to further improve the data transfer speed, recently the rotation speed is 10,000 RPM
A fixed magnetic disk drive equipped with the above spindle motor has also appeared.

[0005]

As the rotation speed of the spindle motor increases with the progress of such technology, the problem is that the disk vibrates due to the excitation force caused by the flow of air generated by the rotation. It is becoming. That is, when a plurality of disks provided in parallel rotate at a high speed, strong turbulence is generated between the disks, which becomes a disturbance and causes the disks to vibrate.

In particular, as the recording density increases, even if the amplitude of the vibration is small, it has a great effect on the positioning of the head.

In order to avoid this effect, conventionally, the thickness of the disk is increased to reduce the vibration, or a blow-out port is provided between each disk, and the air is blown out from the blow-out port to reduce the vibration of the disk. I have. If the thickness of the disk is increased to reduce vibration, the number of disks that can be accommodated in the same space must be reduced. Therefore, the recording capacity of the fixed disk device must be reduced. (For example, Tsuken Real Report vol26 No.2 p563-583)

FIG. 8 is a side sectional view of a conventional fixed magnetic disk drive. In this conventional example, when the disk rotates, air flows into a breathing groove 11 provided in a rotor 10 of a spindle motor 7 and is discharged from a discharge groove 17 provided in a spacer 9 to form an air flow as shown by an arrow. To reduce vibration. However, this conventional method did not provide an airflow with a sufficiently high flow velocity.

The present invention further improves the structure of the above-described conventional method in which the rotor is provided with a discharge hole, and generates a stronger air flow from the inside to the outside between the disks, thereby more effectively vibrating the disks. The aim is to reduce the emissions.

[0010]

The fixed magnetic disk drive according to the present invention is provided with a spiral groove or a convex portion for positively generating an air flow on the rotor or the housing side of the spindle motor. When the rotor rotates, a strong airflow toward the axis is generated by the pumping action of the spiral groove. This air flow flows through the groove provided in the rotor along the axis, and blows out from the hole provided in the spacer in the outer peripheral direction along the surface of the disk. With the above configuration,
A high-velocity airflow can be generated along the surface of each disk from its center to its outer periphery, and this airflow reduces disk vibration.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fixed magnetic disk drive according to a preferred embodiment of the present invention will be described with reference to FIGS.

<< First Embodiment >> A first embodiment of the present invention will be described with reference to FIGS. FIG.
FIG. 2 is a perspective view, partially broken away, of the entire configuration of the fixed magnetic disk drive in the first embodiment.

In FIG. 1, for example, three magnetic disks 2 for recording digital information and a read / write head (hereinafter simply referred to as a head) 3 for reading and writing digital signals to and from each magnetic disk are provided inside a housing 1. Is provided. Each head 3 is provided with a slider (not shown) known in the art for flying at a minute interval with respect to the magnetic disk, and the slider is supported by a suspension 5. A positioning mechanism 6 for positioning the head 3 at a predetermined position in the radial direction on the magnetic disk 2
Driven by FIG. 2 is a sectional view taken along line II-II of FIG.
In the figure, a spindle motor 7 is a motor for driving the magnetic disk 2 at a desired rotation speed, and supports the magnetic disk 2 via a hub 7A.

The disk holder 8 is a member for fixing the rotor 10 of the rotating shaft of the spindle motor 7 and the magnetic disk 2. The spacer 9, together with the disk holder 8, holds the magnetic disk 2 at predetermined intervals at the spindle motor 7.
Are fixed on the rotor 10. The disk holder 8 is provided with a spiral groove 12 having a spiral outer peripheral portion shown in the perspective view of FIG. Also disc holder 8
Are provided with, for example, four suction holes 14 at the center thereof. A plurality (four in FIG. 2) of breathing grooves 11 for allowing air to flow in along the axis are provided on the outer peripheral surface of the rotor 10 of the spindle motor 7 so as to communicate with the suction holes 14. A spiral groove 13 having a larger diameter than the spiral groove 12 and having a spiral shape in a direction opposite to the spiral groove 12 is provided on the upper surface of the fixed portion of the spindle motor 7. The spiral grooves 12 and 13 allow the air to be efficiently pumped by the pumping action at the time of relative rotation between the two.
Collect in one. On the surface of the housing 1 facing the disk holder 8, a housing wall surface 21 having a truncated cone shape is formed.

Details of the shape of the spiral groove 12 are shown in FIGS. FIG. 3A is a perspective view of the disc holder 8, and FIG. 3B is a perspective view of the spacer. FIG. 5 is a plan view of the spindle motor 7 to which the magnetic disk 2 is fixed, as viewed from above.
The fixed shaft 16 and the rotating rotor 10 are rotatably connected to each other. The spiral groove 13 provided in the fixed portion of the spindle motor 7 has a similar shape to the spiral groove 12, but has an outer diameter larger than that of the spiral groove 13 and the spiral directions are opposite to each other.

The operation of this embodiment will be described with reference to FIGS. When the rotor 10 rotates clockwise as viewed from above in the figure indicated by the arrow X, the spiral groove 12 causes air to flow in the direction indicated by the arrow A, and the air is collected in the axial direction of the rotor 10. In particular, near the upper surface of the disk holder 8 above the rotor 10, an air flow is generated along the inclined housing wall surface 21, and the pressure near the suction hole 14 becomes particularly high. As a result, air flows downward from the suction hole 14 into the breathing groove 11. The air that has flowed into the breathing groove 11 is discharged from a discharge groove 17 formed in a portion of the spacer 9 that is in contact with the disk 2, and forms a strong flow of air from the center to the outer periphery. The air flow from the spiral groove 13 flows upward from the suction hole 15 provided in the hub 7A into the breathing groove 11, and is similarly discharged from the discharge groove 17 along the surface of the disk 2. Due to this air flow, the vibration of the disk is reduced, and a high-density and high-speed fixed magnetic disk device can be realized.

When the magnetic disk rotates counterclockwise, the spiral grooves may be formed in the opposite direction.

<< Second Embodiment >> Next, a second embodiment will be described with reference to FIG.

In FIG. 6, a magnetic disk 2, a head 3, a suspension 5, a positioning mechanism 6, a spindle motor 7, a disk holder 8, a spacer 9, a rotor 10,
Since the configurations of the breathing groove 11 and the suction hole 14 are the same as those of the first embodiment, the duplicate description will be omitted. In the second embodiment, a spiral projection 18 is formed on the inner wall 19 of the housing 1 facing the top surface of the magnetic disk 2. The spiral projection 18 may be formed as a groove that is not a projection.

FIG. 7 shows details of the shape of the spiral projection 18. FIG. 7 is a plan view of the spiral projection 18 formed on the inner wall 19 of the housing 1 as viewed from a surface facing the uppermost magnetic disk 2. When the magnetic disk 2 rotates in the direction indicated by the arrow B in FIG.
The air between 9 also rotates in the direction of arrow B. As a result, the air flows toward the axis guided by the spiral convex portion 18, and the air can flow into the suction hole 14 and the breathing groove 11 of FIG. 6 by the pumping action.

By adopting such a configuration, a high-speed airflow from the center of the magnetic disk 2 to the outer periphery can be positively generated as in the first embodiment, and the vibration of the magnetic disk 2 can be reduced. It is possible to reduce the total.

[0022]

According to the present invention, when a disk is rotated by providing a spiral groove or projection on the inner wall of a rotor or a housing of a spindle motor of a fixed magnetic disk drive, the disk rotates from the outside toward the center. A strong air flow is generated and the pressure in the center increases. As a result, a high-speed air flow is generated from the center to the outer periphery of the disk surface through the breathing groove, thereby making it possible to reduce the vibration of the magnetic disk, thereby achieving a high transfer speed and a high recording density. A magnetic disk device can be realized.

[Brief description of the drawings]

FIG. 1 is a partial sectional perspective view showing the configuration of a first embodiment of a fixed magnetic disk drive according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3A is a perspective view showing a configuration of a disc holder 8 according to the first embodiment; FIG. 3B is a perspective view of the spacer 9;

FIG. 4 is a side sectional view showing a main part of the configuration of the first embodiment.

FIG. 5 shows a disk 2 and a spiral groove 1 according to the first embodiment.
Plan view showing 2 and 13

FIG. 6 is a side sectional view of a fixed disk device according to a second embodiment.

FIG. 7 is a plan view of a spiral projection in the second embodiment.

FIG. 8 is a side sectional view of a conventional fixed magnetic disk drive.

[Explanation of symbols]

 1. Housing 2. 2. Magnetic disk Head 5. Suspension 6. Positioning device 7 Spindle motor 8 Disc holder 9. Spacer 10. Rotor 11. Respiratory groove 12,13. Spiral groove 14. Suction hole 16. Motor fixed shaft 17. Discharge groove 18. Spiral projection 19. Inner wall 21. Housing wall

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tatsuhiko Inagaki 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd.

Claims (5)

[Claims] A spindle motor for supporting and rotating a plurality of magnetic disks; a hub provided on a rotating shaft of the spindle motor for mounting the magnetic disks; and a spindle motor for mounting the plurality of magnetic disks on the spindle. Of the motor,
A spacer for arranging the magnetic disk at a desired interval on a rotating shaft; a disk holder for fixing the magnetic disk to a rotating shaft of the spindle motor; a read / write head for recording and reproducing data on the magnetic disk; A read / write head is fixed, and a slider that causes the read / write head to float by a small amount with respect to the magnetic disk by air dynamic pressure generated by relative movement with the magnetic disk; A magnetic disk, the spindle motor, the read / write head, a slider and a housing accommodating the positioning mechanism; and a positioning device for positioning the magnetic disk at a desired position. A groove is provided on the surface of the rotating shaft of the spindle motor, An ejection groove or ejection hole in which a space between a number of magnetic disks communicates with the groove is provided in the spacer, and an inner wall surface of the housing facing the recording surface of the magnetic disk is formed on the recording surface in the vicinity of the disk holder. A fixed magnetic recording device characterized in that it is configured to have the closest shape. 2. A spindle motor for supporting and rotating a plurality of magnetic disks, a hub provided on a rotation shaft portion of the spindle motor for mounting the magnetic disks, and a spindle motor for mounting the plurality of magnetic disks on the spindle. A spacer for arranging the magnetic disk at a desired interval on a rotation axis of the motor; a disk holder for fixing the magnetic disk to the rotation axis of the spindle motor; and a read / write head for recording and reproducing data on the magnetic disk. A slider for fixing the read / write head, and for causing the read / write head to float by a very small amount with respect to the magnetic disk by air dynamic pressure generated by relative movement with the magnetic disk; A positioning device for moving in a radial direction and positioning at a desired position; A fixed magnetic disk device including the magnetic disk, the spindle motor, the read / write head, the slider, and a housing accommodating the positioning mechanism, wherein a plurality of spiral grooves are formed on a surface of the disk press; A fixed magnetic recording apparatus, wherein a groove is provided on the surface of the magnetic disk, and a discharge groove or a connection hole is provided on the spacer so that a space between the plurality of magnetic disks communicates with the groove. 3. The magnetic recording apparatus according to claim 1, wherein a groove is provided on the hub so as to form a gap between the hub and the magnetic disk. 4. A spindle motor for supporting and rotating a plurality of magnetic disks, a hub provided on a rotating shaft portion of the spindle motor for mounting the magnetic disks, and a spindle motor for mounting the plurality of magnetic disks on the spindle. A spacer for arranging the magnetic disk at a desired interval on a rotation axis of the motor; a disk holder for fixing the magnetic disk to the rotation axis of the spindle motor; and a read / write head for recording and reproducing data on the magnetic disk. A slider for fixing the read / write head, and for causing the read / write head to float by a very small amount with respect to the magnetic disk by air dynamic pressure generated by relative movement with the magnetic disk; A positioning device for moving in a radial direction and positioning at a desired position; A fixed magnetic disk device including the magnetic disk, the spindle motor, the read / write head, the slider, and a housing accommodating the positioning mechanism, wherein a groove is provided on a surface of a rotation shaft of the spindle motor; A discharge groove or a discharge hole is provided on the spacer so that a space therebetween communicates with the groove, and a plurality of spiral grooves or spiral protrusions are provided on at least one surface of an inner wall of the housing facing the surface of the magnetic disk. A fixed magnetic disk drive. 5. The magnetic disk according to claim 1, wherein an inner wall surface of the housing facing a recording surface of the magnetic disk is closest to the recording surface in the vicinity of the disk holder. 5. The fixed magnetic recording apparatus according to claim 2, 3 or 4.