JPH0541077A - Hard disk device - Google Patents

Abstract

PURPOSE:To prevent the inside of a disk room and the surface of a hard disk from being stained and to prevent a read/write error and the sticking of a magnetic head from generating by preventing a dust and an oil particle, etc., from being sucked out from the inside of a spindle motor because of a low pressure. CONSTITUTION:On the lower face of a cap 76 and the upper face of a base plate 10, a large number of a fin 78 are provided uniformly and radialy in the direction of the radius of respective hard disks so as to face onto respectively the upper face of a first hard disk 38 and the lower face of a second hard disk 42. Air flow generated from the centers of the surfaces of the first and the second hard disks 38, 42 is prevented by the funs 78, the air flow velocity is suppressed to a comparatively low level and the decreasing of pressure by the increasing of the flow velocity is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard disk device which holds a hard disk in a rotating part and rotationally drives the hard disk in a disk chamber.

[0002]

2. Description of the Related Art When a hard disk is rotationally driven in a disk chamber, an air flow is generated around the surface of the hard disk. In the hard disk device, since the hard disk rotates at a high speed, the flow velocity of the air flow also increases, and the pressure in that part decreases.

Such a pressure drop may suck dust, oil particles, or the like from the inside of a spindle motor as an example of a rotating unit, stain the hard disk, and cause an error.

Therefore, conventionally, in order to alleviate the pressure drop as described above, an air circulation hole is provided which communicates the inside and outside of the disk through a filter.

However, in recent years, in order to respond to further downsizing of devices using a hard disk device such as a computer device, further downsizing of the hard disk device is required. When the size is reduced in this way, the air circulation hole is also reduced in size, so that the effect of mitigating the pressure drop as described above may be less effective. However, if the size of the air circulation hole is increased in order to avoid this, there is an inconvenience that there is a high possibility that dust or the like will flow from the outside of the disc chamber into the disc chamber through the filter.

The present invention has been made in view of the above problems existing in the prior art, and an object of the present invention is to provide an area of an air circulation hole which communicates the inside and the outside of a disk through a filter. Is made relatively small to prevent dust and the like from flowing into the disk chamber as much as possible, while preventing dust, oil particles, and the like from being sucked out from the inside of the spindle motor due to low pressure, It is an object of the present invention to provide a hard disk device capable of preventing a read / write error, a magnetic head sticking and the like from being contaminated in the disk chamber and by extension the hard disk surface.

[0007]

In order to achieve the above object, a hard disk device of the present invention is a hard disk device which holds a hard disk in a rotating part in a disk chamber and rotationally drives the hard disk. It is assumed that a protrusion that obstructs the flow of air generated by the rotation of the hard disk and suppresses the flow velocity is provided facing the surface of the hard disk.

[0008]

Since the protrusion that obstructs the air flow caused by the rotation of the hard disk is provided facing the surface of the hard disk, the flow velocity of the air flow centered on the surface of the hard disk rotation becomes relatively low. It is suppressed, and the low pressure due to the increase in flow velocity is prevented.

[0009]

Embodiments of the present invention will be described with reference to the drawings. 1 is a plan view of a hard disk drive as one embodiment of the present invention, and FIG. 2 is a sectional view taken along the line II-O-II in FIG. However, FIG. 1 is shown with the lid of the disc chamber removed.

Reference numeral 10 is a base of the disk chamber 11. An annular recess 12 is provided to the right of the center of the base 10 in FIG. 1, and a cylindrical protrusion 14 is provided upright from the inner peripheral portion of the bottom of the annular recess 12 toward the inside of the disk chamber 11. The inner peripheral portion of the cylindrical protrusion 14 is a penetrating portion. In addition, the outer peripheral portion of the opening of the annular recess 12 has a slightly enlarged outer diameter to form the enlarged diameter portion 16.

Reference numeral 18 is a first ball bearing, and 20 is a second ball bearing. The outer rings of the first ball bearing 18 and the second ball bearing 20 are fixed to the inner peripheral wall 14a of the cylindrical protrusion 14 with an adhesive. 22 is a first ball bearing 18 and a second ball bearing 20.
And a cylindrical spacer interposed between and. 24 is a cup-shaped rotor hub. A hollow rotary shaft 26 is provided so as to project inside the central portion of the rotor hub 24. The inner rings of the first ball bearing 18 and the second ball bearing 20 are fixed to the outer peripheral surface of the rotary shaft 26 with an adhesive. There is. 28 is a stator core fixed to the outer peripheral wall 14b of the cylindrical protrusion 14;
Reference numeral 30 is a stator coil wound around the stator core 28, and 32 is a rotor magnet fixed inside the peripheral wall 34 of the rotor hub 24 and facing the stator core 28 with a circumferential gap therebetween.

The open end 34 of the peripheral wall 34 of the rotor hub 24
a is in a state of being inserted into the annular recess 12 up to the vicinity of the bottom thereof, and the outwardly extending portion 36 provided in the middle portion of the peripheral wall 34 is the enlarged diameter portion provided in the opening of the annular recess 12. 1
It is in a state that it is fitted in 6. Then, the rotor magnet 32, the rotor hub 24, and the outward protruding portion 36,
The annular recess 12 and the enlarged diameter portion 16 thereof provide a labyrinth sealing effect and prevent oil fine particles and dust from scattering into the disk chamber 12.

A first hard disk 38 is externally fitted onto the outwardly projecting portion 36 on the outer peripheral portion of the rotor hub 24, an annular spacer 40 is provided on the first hard disk 38, and a first spacer is provided on the spacer 40. 2 hard disk 4
2 is externally fitted. Reference numeral 44 is a clamp member that holds the first and second hard disks 38 and 42 in a fixed manner.
The clamp member 44 is fitted to the end surface portion of the rotor hub 24 and is screwed. Reference numeral 46 denotes a sealing member that seals the inner peripheral portion of the cylindrical protrusion 14 that is a through portion at the lower end portion in FIG. is there.

A spindle motor for driving a hard disk is constituted by the annular recess 12, the cylindrical protrusion 14, the first ball bearing 18, the second ball bearing 20, the rotor hub 24, the stator core 28, the stator coil 30, the rotor magnet 32, etc. A is configured. Since the annular recess 12 of the spindle motor A is provided integrally with the substrate 10, the height of the entire device can be suppressed low.

A circular recess 50 is provided slightly to the left of the base 10 in FIG. 1, and the circular recess 50 is provided.
The base portion 52a of the fixed shaft 52 is fitted and fixed to. A rotary sleeve member 58 is rotatably supported on the fixed shaft 52 via a third ball bearing 54 and a fourth ball bearing 56.

Reference numeral 60 is an arm member projecting from the rotary sleeve member 58 toward the first and second hard disks 38 and 42, and 62 is a magnetic head provided at the tip of the arm member 60. This magnetic head 62 has a first
, And the second hard disks 38 and 42, respectively. Reference numeral 64 denotes a movable coil fixed to the rotating sleeve member 58 on the side opposite to the arm member 60.

Reference numeral 66 is a first yoke, and 68 is a second yoke. The first yoke 66 is screwed to the end of the fixed shaft 52, and the second yoke 68 is fitted to the fixed shaft 52.

A pair of substantially fan-shaped permanent magnet plates 74 are fixed to the facing surfaces of the first yoke 66 and the second yoke 68, respectively. As this permanent magnet plate 74, Nd-Fe-B is used.
It is desirable to use a system magnet.

The fixed shaft 52, the third ball bearing 54, the fourth
Ball bearing 56, rotating sleeve member 58, movable coil 64,
The first yoke 66, the second yoke 68, the permanent magnet plate 74, and the like constitute a voice coil motor B for rotating the arm member 60 to move and position the magnetic head 62.

Reference numeral 76 denotes a lid of the disc chamber 11,
It has a box shape. The spindle motor A, the first and second hard disks 38 and 42, the voice coil motor B, the arm member 60, the magnetic head 62, etc. are hermetically sealed in the disk chamber 11 formed by attaching the lid 76 to the base 10. Has been done.

Reference numeral 78 denotes fins (projections) provided on the lower surface of the lid 76 and the upper surface of the base 10 in FIG.
The fins 78 projecting from the lower surface of the lid body 76 face the upper surface of the first hard disk 38 so as to face the first hard disk 3.
8 are provided in a radial pattern evenly in a radial direction of 8,
The fins 78 projecting from the upper surface of the base 10 face the lower surface of the second hard disk 42.
2 are provided in a radial pattern evenly in the radial direction.
However, it is not provided in the movable region of the arm member 60 and the magnetic head 62.

The first and second spindle motors A
When the hard disks 38 and 42 rotate, the air flow caused around the surfaces of the first and second hard disks 38 and 42 is blocked by the fins 78, and the air flow velocity is suppressed to a relatively low level. It is possible to prevent lowering of the pressure due to the increase of. Therefore, dust and oil particles are prevented from being sucked out from the inside of the spindle motor A by lowering the pressure, and the inside of the disk chamber 11 and the surfaces of the first and second hard disks 38 and 42 are contaminated, resulting in a read / write error. It is also possible to prevent the magnetic head 62 from sticking.

In this embodiment, the fins are provided on the lower surface of the lid body 76 and the upper surface of the base plate 10, but any one of them can obtain a desired effect.

[0024]

In the hard disk drive of the present invention, the protrusions that obstruct the air flow caused by the rotation of the hard disk prevent the low pressure due to the increase in the flow velocity of the air flow caused by the rotation of the hard disk around its surface. ..

Therefore, the area of the air circulation hole communicating between the inside and the outside of the disc through the filter is made relatively small to prevent dust and the like from flowing into the disc chamber as much as possible, and at the same time, a spindle as an example of a rotating portion Dust, oil particles, etc. are prevented from being sucked out by the low pressure from the inside of the motor and the bearing part that supports the spindle part, which is another example of the rotating part. It is prevented from being contaminated and causing a read / write error or sticking of the magnetic head.

[Brief description of drawings]

FIG. 1 is a plan view of a hard disk device.

FIG. 2 is a sectional view taken along the line II-O-II in FIG.

[Explanation of sign]

 11 disk chamber 24 rotor hub 38 first hard disk 42 second hard disk 78 fins

Claims (1)

[Claims] 1. A hard disk device for holding a hard disk in a rotating portion in a disk chamber and driving the hard disk to rotate, wherein a protrusion for preventing a flow of air generated by the rotation of the hard disk and suppressing a flow velocity thereof is a hard disk. A hard disk device, which is provided so as to face the surface of the hard disk.