JPH0547099A - Hard disk - Google Patents

Abstract

PURPOSE:To make the height of the entire device even lower by keeping the height of a spindle motor for hard disk driving as low as possible and arranging a circuit substrate while making an effective use of a space. CONSTITUTION:A circular recessed part 14 of a spindle motor A is integrally provided on a substrate 10. The end part of a cylindrical part 16 and the inner surface of a disk room 12 of the substrate 10 shall be almost the same height, to hold a first ball bearing 22 and a second ball bearing 24 inside a cylindrical part 16. A rotary yoke 38, rotary magnet 40, stator core 34, and stator coil 36 are housed in the circular recessed part 14. The height of the spindle motor A is suppressed, and the section area of a projection part 18 is reduced due to its radial gap type. When a circuit substrate 7 is arranged between the outside surface of the disk room 12 of the substrate 10 and the bottom of a projection part 18, the increase of the height of the entire device can be 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 drive in which a hard disk drive spindle motor is constructed by using a part of a disk chamber base.

[0002]

2. Description of the Related Art Demands for thinning and downsizing of computer devices such as notebook personal computers are becoming more and more strict, and various computers are required to meet such demands. The hard disk device used in the device is also required to be thinner and smaller. Conventionally, a spindle motor for driving a hard disk has been separately manufactured and mounted on a base of a disk chamber in a hard disk device.However, by using the base of the disk chamber as a constituent member of the spindle motor, the above-mentioned request is met. Can answer to some extent.

However, with such means alone,
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 high, and it has not been possible to sufficiently meet the demand for a thinner overall device. In addition, it is effective to use the axial gap type to make the motor thinner, but if this is done, the radius of the motor becomes relatively large in order to obtain the required power, and there is a demand for downsizing. Did not necessarily match.

The present invention has been made in view of the above problems existing in the prior art, and its object is a hard disk constructed by utilizing a part of the base of the disk chamber. By suppressing the height of the drive spindle motor as low as possible to reduce the height of the entire device as much as possible, and by effectively utilizing the space to dispose the circuit board, It is an object of the present invention to provide a hard disk device that can further reduce the height of the entire device.

[0005]

In order to achieve the above object, a hard disk drive of the present invention is provided with an annular recess opening to the inside of the disk and a part of the base of the disk drive in the hard disk drive. A hard disk device having a cylindrical portion for holding a bearing which projects from the inner peripheral portion of the bottom to a height near the inner surface of the disk inner surface of the base, and the outer disk outer portion of the annular recess is a protruding portion, A rotating shaft of a rotor hub that holds a hard disk indoors is supported via a bearing held inside the cylindrical portion, and is fixed inside the annular recess outside the cylindrical portion, and the armature. On the other hand, it is assumed that the field means fixed to the rotor hub so as to face each other in the radial direction are substantially accommodated.

In the hard disk device of the present invention, the circuit board may be arranged in the outer peripheral space of the protrusion between the outer surface of the disk chamber of the base and the bottom surface of the protrusion.

[0007]

The operation is such that the annular recess is integrally provided on the base, and the end of the cylindrical portion and the disk inner surface of the base have almost the same height, and the bearing is held inside the cylindrical portion. In addition, since 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 substantially accommodated in the annular recess. The height of the portion forming the radial gap type spindle motor can be suppressed as much as possible.

Further, since the spindle motor is of the radial gap type, the cross-sectional area of the protrusion is relatively small, so that a sufficient space can be obtained on the outer periphery of the protrusion between the outer surface of the disk chamber of the base and the bottom surface of the protrusion. By disposing the circuit board, the circuit board is effectively used and the height of the entire device is prevented from increasing.

[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, FIG. 2 is a bottom view thereof, FIG. 3 is a sectional view taken along line III-O-III in FIG. 1, and FIG. 4 is a spindle motor in FIG. FIG. However, FIG. 1 is shown with the lid of the disc chamber removed.

Reference numeral 10 is a base of the disk chamber 12. To the right of the center of the base 10 in FIG.
An annular recess 14 that opens inward is provided, and a cylindrical portion 16 projects from the inner peripheral portion of the bottom of the annular recess 14 to the vicinity of the inner surface height of the disk chamber 12 of the base 10 (a slightly lower position in this embodiment). Has been done. The inner peripheral portion of the cylindrical portion 16 is a through portion. Disk chamber 12 of annular recess 14
The outside is formed as a protrusion 18. The annular recess 1
The outer peripheral portion of the opening of No. 4 is configured as an expanding portion 20 that slightly expands in a trumpet shape.

Reference numeral 22 is a first ball bearing, and 24 is a second ball bearing. The outer races of the first ball bearing 22 and the second ball bearing 24 are fixed to the inner peripheral wall of the cylindrical portion 16 with an adhesive. Reference numeral 26 is a cylindrical spacer interposed between the first ball bearing 22 and the second ball bearing 24. 28 is a rotor hub. A rotary shaft 30 is provided so as to project from the center of the rotor hub 28, and the first ball bearing 22 is provided on the outer peripheral surface of the rotary shaft 30.
The inner ring of the second ball bearing 24 is fixed by an adhesive. The peripheral wall 32 of the rotor hub 28 projects outward, and its outer periphery is reduced in diameter in a funnel shape downward in FIG. 3 and faces the expanded portion 20 of the annular recess 14 with a slight gap.

Reference numeral 34 is a stator core fixed to the outer peripheral wall of the cylindrical portion 16, and reference numeral 36 is a stator coil wound around the stator core 34. Reference numeral 38 denotes a cylindrical rotor yoke whose upper end is fixed inside the peripheral wall 32 of the rotor hub 28, and 40 is a cylindrical rotor magnet fixed inside the rotor yoke 38. Rotor magnet 40
And the stator core 34 face each other with a circumferential gap.

The rotor yoke 38, the rotor magnet 40 (field means), the stator core 34 and the stator coil 36 (armature) are housed in the annular recess 14. The rotor magnet 40, the rotor yoke 38, and the rotor hub 28, and the annular recess 14 and the expanded portion 20 thereof provide a labyrinth seal effect and prevent oil particles and dust from scattering in the disk chamber 12.

A hard disk 42 is fitted on the peripheral wall 32 of the rotor hub 28. Reference numeral 44 is a clamp member that holds the hard disk 42 in a fixed manner. The clamp member 44 is screwed to the end surface portion of the rotor hub 28. Reference numeral 46 is a sealing member that seals the inner peripheral portion of the cylindrical portion 16 serving as the penetrating portion at the lower end portion in FIG.

The annular recess 14, the cylindrical portion 16, the first ball bearing 22, the second ball bearing 24, the rotor hub 28, the stator core 34, the stator coil 36, the rotor yoke 38, the rotor magnet 40, etc. for driving the hard disk 42 are used. A spindle motor A is configured. Since the annular recess 14 of the spindle motor A is provided integrally with the substrate 10, the height of the entire device can be kept low. Moreover, the end portion of the cylindrical portion 16 and the inner surface of the disk chamber 12 of the substrate 10 have almost the same height, and the first ball bearing 22
Since the second ball bearing 24 and the second ball bearing 24 are held inside the cylindrical portion 16, and the rotor yoke 38, the rotor magnet 40, the stator core 34, and the stator coil 36 are accommodated in the annular recess 14, the radial gap type is used. The height of the portion forming the spindle motor A is suppressed as much as possible.

A circular recess 48 is provided slightly to the left of the base 10 in FIG. 1, and the circular recess 48 is provided.
The base portion 50a of the fixed shaft 50 is fitted and fixed to the. A rotating 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 is an arm member projecting from the rotary sleeve member 56 toward the hard disk 42, and 60 is a magnetic head provided at the tip of the arm member 58. The magnetic heads 60 are mounted on both sides of the hard disk 42, respectively.

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

A pair of substantially fan-shaped permanent magnet plates 72 are fixed to the facing 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. Regarding the movable range C of the voice coil motor B, the arm member 58 and the magnetic head 60, the height of the substrate 10 is low.

Reference numeral 74 denotes a lid of the disc 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, etc. are hermetically sealed in the disk chamber 12 formed by attaching the lid 74 to the base 10. Reference numeral 76 is a circuit board. A circular hole 78 is provided in the circuit board 76, and the circuit board 76 is attached to the outer surface of the disk chamber 12 of the substrate 10 in a state where the protrusion 18 is fitted in the circular hole 78 below the disk chamber 12 in FIG. It is fixed between the bottom surface of FIG. 3) and the bottom surface of the protrusion 18. The circuit board 76 is fixed by being screwed to the short protrusion 80 protruding downward from the substrate 10 in FIG.

Since the spindle motor A is of the radial gap type, the cross-sectional area of the protrusion 18 is relatively small, so that the outer periphery of the protrusion 18 between the outer surface of the disk chamber 12 of the base 10 and the bottom surface of the protrusion 18 is sufficient. A space
By disposing the circuit board 76, the circuit board 76 is effectively used to avoid an increase in the height of the entire device. Reference numeral 82 is a long protrusion protruding downward from the base 10. In this long protrusion 82, the main body 8 in which the hard disk device 42 is incorporated
It is screwed to 3.

Reference numeral 84 is a rubber tube fitted in a through hole provided in the bottom plate of the annular recess 14, 88 is a lead wire drawn from the inside of the spindle motor A through the rubber tube 84, and 90 is the lead wire 88. Is a flexible substrate to which is connected. The flexible board 90 is the circuit board 76.
Is electrically connected to a terminal portion provided on the.

[0022]

In the hard disk drive according to the first aspect of the present invention, the height of the spindle motor portion formed by providing a protrusion on a part of the base of the disk chamber of the hard disk drive can be suppressed as much as possible, so that Height is minimal. Therefore, it greatly contributes to thinning and downsizing of a computer device or the like having a built-in hard disk device.

In the hard disk drive of the second aspect, since the spindle motor is of the radial gap type, a sufficient space can be obtained on the outer periphery of the protruding portion, and the circuit board is contained within the protruding height of the protruding portion. .. Therefore, it contributes to further thinning and downsizing of a computer device or the like having a built-in hard disk device.

[Brief description of drawings]

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

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

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

FIG. 4 is an enlarged view of the spindle motor in FIG.

[Explanation of sign]

 10 Base 12 Disk Chamber 14 Annular Recess 16 Cylindrical 18 Protrusion 28 Rotor Hub 30 Rotor Shaft 34 Stator Core 36 Stator Coil 38 Rotor Yoke 40 Rotor Magnet 76 Circuit Board

Claims (2)

[Claims] 1. A ring-shaped concave portion opening to the inside of the disk chamber in a part of the disk chamber base of the hard disk device.
And a cylindrical portion for holding a bearing that projects from the inner peripheral portion of the bottom of the annular recess toward the height of the disk inner surface of the base, and the disk outer side of the annular recess is a hard disk device configured as a projection. The rotating shaft of the rotor hub that holds the hard disk in the disk chamber is supported via a bearing held inside the cylindrical portion, and in the annular recess, an armature fixed to the outside of the cylindrical portion. And a field means fixedly provided on the rotor hub so as to face the armature in a radial direction, and a hard disk device. 2. The hard disk drive according to claim 1, wherein a circuit board is mounted in an outer peripheral space of the protrusion between the outer surface of the disk chamber of the base and the bottom surface of the protrusion.