JP3351542B2 - Hard disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard disk drive in which a spindle motor for driving a hard disk is formed by using a part of a base of a disk chamber.

[0002]

2. Description of the Related Art The demand for thinner and smaller computer devices such as notebook personal computers is becoming more and more severe. Hard disk drives used in such apparatuses are also required to be further thinner and smaller. Conventionally, the spindle motor for driving the hard disk has been manufactured separately and assembled to the base of the disk chamber in the hard disk drive.However, this means has been met by using the base of the disk chamber as a constituent member of the spindle motor. Can respond to some extent.

[0003] However, only by such means,
There are limits to thinning and miniaturization. That is, when the spindle motor is of the radial gap type, the height of the motor itself is inevitably increased, and the demand for a thinner device as a whole cannot be sufficiently satisfied. To reduce the thickness of the motor, it is effective to use an axial gap type. However, in order to obtain the necessary power, the radius of the motor becomes relatively large. Did not always match.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the prior art, and has as its object to provide a hard disk which is constructed by using a part of a base of a disk room. A hard disk drive capable of keeping the height of the drive spindle motor as low as possible and the overall height of the apparatus as low as possible, and by disposing a circuit board by effectively utilizing space, It is an object of the present invention to provide a hard disk drive capable of further reducing the height of the entire device.

[0005]

To achieve the above object, according to the Invention The hard disk apparatus of the present invention, a part of the base of the disk compartment in a hard disk device, the disk outdoor
A cylindrical protrusion with a bottom protruding into the bottom wall of the protrusion
Bearing holder that protrudes from the surface to near the height
A supporting cylindrical portion is provided integrally with the outer peripheral wall of the projecting portion.
An annular recess that opens toward the inside of the disc chamber is formed between the cylinder and the cylinder
A Ru hard disk device name and, in a state in which the entire length of the rotation axis of the rotor hub that holds the hard at disk compartment is accommodated in the cylindrical portion, the axial end portion side and the axial base in the inside of the cylindrical portion Are supported via a pair of ball bearings respectively held on the side, the ball bearing on the axial end side is located at the position of the base in the axial direction, and the ball bearing on the axial base side is the ball bearing in the axial direction. An armature fixed to the outside of the cylindrical portion and substantially over the entire length of the cylindrical portion, and is fixed to the rotor hub so as to be radially opposed to the armature in the annular concave portion. And the inner peripheral surface of the cylindrical surface of the field means is opposed to the outer peripheral surface of the armature radially outward with a radial gap therebetween. In the protruding part of the means The outer peripheral surface of the cylindrical surface is radially inwardly opposed to the inner peripheral surface of the outer peripheral wall of the protruding portion with a radial gap therebetween, and is located between the outer surface of the disc chamber of the base and the bottom surface of the protruding portion. And a circuit board is disposed in the outer peripheral space of the protruding portion.

[0006] The hard disk apparatus of the present invention is, above
The terminal portion of the circuit board and the inside of the annular concave portion are formed in the annular shape.
Electrically connected through through holes provided in the bottom plate of the recess
It can be assumed that.

[0007]

The outer portion of the disk chamber is formed as a protrusion.
An annular concave portion is provided integrally with the base, the end of the cylindrical portion and the inner surface of the disk of the base are approximately the same height, and the rotation axis of the rotor hub has the entire length of the cylindrical shape.
The cylindrical member is housed in the part through a pair of ball bearings.
The armature fixed to the outside of the cylindrical portion and the field means fixed to the rotor hub so as to face the armature in the radial direction are supported in the annular recess. The armature is almost housed , and the armature
Since the height is effectively used for a long time, the height of the portion constituting the radial gap type spindle motor can be reduced as much as possible. Thus, the radial gap spin
While holding down the height of the dollar motor part,
Position the rotating shaft with the base in the axial direction.
The axial end ball bearing, and the axial projection
Via the ball bearing on the axial base located at the position of the protrusion,
Support in a cylindrical part provided integrally as a part of the base
Therefore, the rigidity of supporting the rotating shaft is excellent, and the rotor hub is good.
Good rotation accuracy is realized.

The cylindrical inner peripheral surface of the field means has a radial
Facing the outer peripheral surface of the armature radially outward with a gap
A radial gap type, and the projection
The cylindrical outer peripheral surface located in the part is separated by a radial gap.
Relative to the inner circumferential surface of the cylindrical outer wall of the protrusion inward in the radial direction
As a result, the cross-sectional area of the protrusion is relatively small, so that a sufficient space is obtained around the protrusion between the outer surface of the disk chamber of the base and the bottom surface of the protrusion, and the circuit board is effectively used by disposing the circuit board. This avoids an increase in the overall height of the device.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a hard disk drive as one embodiment of the present invention, FIG. 2 is a bottom view thereof, FIG. 3 is a sectional view taken along the line III-O-III in FIG. 1, and FIG. FIG. However, FIG. 1 shows a state where the lid of the disk chamber is removed.

Reference numeral 10 denotes a base of the disk chamber 12. In the center of the base 10 in FIG.
Cylindrical protrusion with an outer peripheral wall that is cylindrical with a bottom that protrudes outward
The part 18 is provided integrally. Inner surface of bottom wall of protrusion 18
To the vicinity of the height of the disk inner surface of the base (in this embodiment,
(Slightly lower position) and the cylindrical part 16 for holding the bearing
It protrudes from the body. Thereby, the inside of the outer peripheral wall of the protrusion 18 is
Between the peripheral portion and the outer peripheral portion of the cylindrical portion 16 inside the disk chamber 12.
An annular recess 14 is formed which opens to the bottom. Cylindrical part 16
Has an inner peripheral portion . The outer peripheral portion of the opening of the annular concave portion 14 is formed as an expanding portion 20 which slightly expands like a trumpet.

Reference numeral 22 denotes a first ball bearing, and reference numeral 24 denotes a second ball bearing. The outer ring of the first ball bearing 22 and the second ball bearing 24 is fixed by adhesive to axially upper and lower portions of definitive the inner peripheral wall of the cylindrical portion 16. 26 is the first ball bearing 22 and the second ball bearing
It is a cylindrical spacer interposed between the ball bearing 24.
The first ball bearing 22 is located at the position of the base 10 in the axial direction.
And the second ball bearing 24 is positioned at the position of the protrusion 18 in the axial direction.
Is located. 28 is a rotor hub. Rotary shaft 30 is protruded in a central portion of the rotor hub 28, its axis of rotation
30 is accommodated in the cylindrical portion 16, and a first ball bearing 22 and a second ball bearing 24
Inner ring is fixed by an adhesive. Rotor hub 2
The peripheral wall 32 of 8 protrudes outward, and its outer periphery is reduced in a funnel shape in the downward direction in FIG. 3 and is opposed to the enlarged portion 20 of the annular concave portion 14 with a slight gap.

Reference numeral 34 denotes a stator core fixed to the outer peripheral wall of the cylindrical portion 16, and reference numeral 36 denotes a stator coil wound around the stator core 34. The stator core 34 and the stator
The armature consisting of the motor coil 36
Long. 38 is a cylindrical rotor yoke whose upper end is fixed inside the peripheral wall 32 of the rotor hub 28;
This is a cylindrical rotor magnet fixed inside the rotor yoke 38. Of the cylindrical surface of the rotor magnet 40
The peripheral surface and the outer peripheral surface of the stator core 34 face each other with a radial gap therebetween. The rotor yoke 38 protrudes.
The outer peripheral surface of the cylindrical surface located at the portion 18 is separated by a radial gap.
Radially inward from the inner peripheral surface of the cylindrical outer peripheral wall of the lever projection 18.
Are facing.

The rotor yoke 38 and the rotor magnet 40 (field means), the stator core 34 and the stator coil 36 (armature) are housed in the annular recess 14. The labyrinth sealing effect is obtained by the rotor magnet 40, the rotor yoke 38 and the rotor hub 28, the annular concave portion 14 and the expanded portion 20, and the oil fine particles and dust are prevented from scattering into the disk chamber 12.

A hard disk 42 is fitted on the peripheral wall 32 of the rotor hub 28. Reference numeral 44 denotes a clamp member for fixing and holding the hard disk 42. The clamp member 44 is screwed to an end face of the rotor hub 28. Reference numeral 46 denotes a sealing member for sealing the inner peripheral portion of the cylindrical portion 16 serving as a penetrating portion at the lower end portion in FIG.

The hard disk 42 is driven by the annular recess 14, cylindrical portion 16, first ball bearing 22, second ball bearing 24, rotor hub 28, stator core 34, stator coil 36, rotor yoke 38, rotor magnet 40, and the like. A spindle motor A is configured. Day
Since the ring-shaped concave portion 14 in which the portion outside the disc chamber 12 is configured as the protruding portion 18 is provided integrally with the base 10,
The overall height of the device is kept low. Also, the height of the end of the cylindrical portion 16 and the inner surface of the disk chamber 12 of the base 10 are substantially the same, and the entire length of the rotating shaft 30 of the rotor hub 28 is
Are accommodated in the cylindrical portion 16 and the first ball bearing 22 and
Is supported within the cylindrical portion 16 through the second ball bearing 24 Rutotomoni rotor yoke 38 and the rotor magnet 40 and the stator core 34 and stator coil 36, the stator core 34 and Sutetako housed in an annular recess 14
The armature composed of the yl 36 extends over almost the entire length of the cylindrical portion 16.
The height of the portion constituting the radial gap type spindle motor A is reduced as much as possible by effectively utilizing the height. Thus, the radial gap type spinned
The total length in the cylindrical part 16 is reduced while the height of the motor
The accommodated rotary shaft 30 is positioned at the position of the base 10 in the axial direction.
The first ball bearing 22 located at the position, and a projection in the axial direction
18 through the second ball bearing 24 located at the position 18.
Supported within the cylindrical part 16 provided integrally as a part of the cylinder
Therefore, the rigidity for supporting the rotating shaft 30 is excellent,
Good rotational accuracy is realized for the valve 28.

A circular recess 48 is provided slightly above and to the left of the base 10 in FIG.
The base 50a of the fixed shaft 50 is fitted and fixed thereto. A rotary sleeve member 56 is rotatably supported on the fixed shaft 50 via a third ball bearing 52 and a fourth ball bearing 54. Reference numeral 58 denotes an arm member projecting from the rotary sleeve member 56 toward the hard disk 42, and reference numeral 60 denotes a magnetic head provided at a distal end of the arm member 58. The magnetic heads 60 are provided on both surfaces of the hard disk 42, respectively.

Reference numeral 62 denotes a movable coil fixed to the rotating sleeve member 56 on the side opposite to the arm member 58.
64 is a first yoke, and 66 is a second yoke. The first yoke 64 is screwed to an end of the fixed shaft 50, and the second yoke 66 is fitted to the fixed shaft 50. The base 10 is provided with a screw hole (not shown) for yoke positioning, and a bolt 70 for positioning and fixing is provided on the first yoke 64.
And the second yoke 66 is screwed into the screw hole.

A pair of substantially sector-shaped permanent magnet plates 72 are fixed to the opposing surfaces of the first yoke 64 and the second yoke 66, respectively. As the permanent magnet plate 72, Nd-Fe-
It is desirable to use a B-based magnet. And the fixed shaft 50,
Third ball bearing 52, fourth ball bearing 54, rotating sleeve member 5
6, movable coil 62, first yoke 64, second yoke 6
6. The permanent magnet plate 72 and the like constitute a voice coil motor B for rotating the arm member 58 to move and position the magnetic head 60. Note that the movable range C of the voice coil motor B, the arm member 58 and the magnetic head 60 is configured such that the height of the base 10 is low.

Reference numeral 74 denotes a lid of the disk chamber 12,
It has a box shape. The spindle motor A, the hard disk 42, the voice coil motor B, the arm member 58, the magnetic head 60, and the like are sealed in the disk chamber 12 formed by attaching the cover 74 to the base 10. 76 is a circuit board. The circuit board 76 is provided with a circular hole 78, and the circuit board 76 is mounted on the outer surface of the disk chamber 12 of the base 10 in a state where the projection 18 is fitted into the circular hole 78 below the disk chamber 12 in FIG. 3 and the bottom surface of the protrusion 18. The circuit board 76 is fixed by being screwed from the base 10 to a short projection 80 projecting downward in FIG.

The cylindrical inner peripheral surface of the rotor magnet 40
And the outer peripheral surface of the stator core 34 are separated by a radial gap.
Radial gap type for the rotor yoke 38
The cylindrical outer peripheral surface located at the protruding portion 18 is
The inner peripheral surface and diameter of the cylindrical outer peripheral wall of the protruding portion 18 separated by a gap
Since the projections 18 face each other inward, the cross-sectional area of the projections 18 is relatively small, so that there is sufficient space on the outer periphery of the projections 18 between the outer surface of the disk chamber 12 of the base 10 and the bottom surface of the projections 18. The arrangement of the circuit board 76 makes effective use of the circuit board 76, thereby preventing an increase in the height of the entire device. Reference numeral 82 denotes a long projection projecting downward from the base 10. The long protrusion 82 is screwed to a main body 83 in which the hard disk 42 device is incorporated.

Reference numeral 84 denotes a rubber tube fitted in a through hole provided in the bottom plate of the annular concave portion 14, reference numeral 88 denotes a lead wire drawn out of the spindle motor A through the rubber tube 84, and reference numeral 90 denotes a lead wire 88 thereof. Is a flexible substrate connected. The flexible substrate 90 includes a circuit board 76.
Are electrically connected to a terminal portion provided in the terminal.

[0022]

According to the hard disk drive of the first aspect, the height of the spindle motor portion formed by providing a projection on a part of the base of the disk chamber in the hard disk drive can be reduced as much as possible. height Ri stop <br/> or minimized, Thus also good rotor hub rotation accuracy is achieved. Change
In addition, the cross-sectional area of the protrusion is relatively small,
The protrusion between the outer surface of the disc chamber and the bottom of the protrusion
Sufficient space is provided on the outer periphery, and the circuit board is
Hard disk drive
To reduce the thickness and size of computer devices with built-in
Is big.

In the hard disk drive according to the second aspect, the circuit
The terminal portion of the substrate and the inside of the annular concave portion are
They are electrically connected through through holes provided in the bottom plate.

[Brief description of the drawings]

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

FIG. 2 is a bottom view of the hard disk device.

FIG. 3 is a sectional view taken along line III-O-III in FIG.

FIG. 4 is an enlarged view of a spindle motor in FIG. 3;

[Description of sign]

 DESCRIPTION OF SYMBOLS 10 Base 12 Disk chamber 14 Annular recess 16 Cylindrical part 18 Projection part 28 Rotor hub 30 Rotation axis 34 Stator core 36 Stator coil 38 Rotor yoke 40 Rotor magnet 76 Circuit board

Continued on the front page (56) References Japanese Utility Model Showa 64-890 (JP, U) Japanese Utility Model Showa 64-12296 (JP, U) Tokuhyo Hei 5-507170 (JP, A)

Claims (2)

(57) [Claims] 1. A bottomed cylindrical shape protruding outside a disk chamber on a part of a disk chamber base in a hard disk drive.
The protrusion and the disk chamber of the base from the inner surface of the bottom wall of this protrusion
Integrates with the cylindrical part for holding the bearing that protrudes near the inner surface height
A disk chamber is provided between the outer peripheral wall of the protrusion and the cylindrical portion.
A Ru hard disk device name to form an annular recess which opens inwardly, with the total length of the rotation axis of the rotor hub that holds the hard at disk compartment is accommodated in the cylindrical portion, the axis of the inside of the cylindrical portion Supported by a pair of ball bearings respectively held on the axial end side and the axial base side, wherein the ball bearing on the axial end side is located at the position of the base in the axial direction, and on the axial base side. The ball bearing is located at the position of the protruding portion in the axial direction. In the annular concave portion, an armature fixed to the outside of the cylindrical portion and extending over substantially the entire length of the cylindrical portion, and is radially opposed to the armature. And a magnetic field means fixed to the rotor hub so that the outer peripheral surface of the armature is radially spaced from the outer circumferential surface of the armature with a radial gap therebetween. Towards and in front of The cylindrical outer peripheral surface of the field means located at the protruding portion is radially inwardly opposed to the inner peripheral surface of the outer peripheral wall of the protruding portion with a radial gap therebetween. A hard disk drive, wherein a circuit board is provided in an outer peripheral space of a protrusion between an outdoor surface and a bottom surface of the protrusion. 2. The hard disk drive according to claim 1, wherein the terminal portion of the circuit board and the inside of the annular recess are electrically connected through a through hole provided in a bottom plate of the annular recess .