JPH05159450A - Recording disk driving device - Google Patents

Abstract

PURPOSE:To reduce the thickness of the device all the more without detriment to the driving force and the rigidity of the device by providing a field magnetic pole part on one surface of a disk mounted on a hub and providing an armature on a fixed member opposite to this field pole part. CONSTITUTION:The recording disk 1 is fixedly held by a hub member 2 supported freely rotatively by the fixed member 3, and a field magnet 8 is formed as the field magnet pole part via a yoke member 16 on the lower surface 26 of the disk 1. The armature 7 is provided on a flat part 23 of a bracket 3 opposite to this field magnet 8, and an air-core winding formed into approximate triangles is arrayed in an annular pattern. Then, the disk 1 is driven by relative rotation of these field magnet 8 and armature 7. By this constitution, since the field magnet 8 and the armature 7 are disposed opposite to each other without interposing the hub member, etc., the heightwise directional dimension can be diminished and hence the device can be thin structive.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art FIG. 3 is a cross-sectional view showing a left half of a drive unit of a magnetic disc drive device for rotating a magnetic disc, which is a recording disc, for example. In FIG. 3, a bracket e, which is a fixing member, has a cylindrical portion k provided coaxially with its rotation axis, and a pair of bearing members f and g are provided on the inner peripheral portion of the cylindrical portion k. Is installed. The shaft member i is rotatably supported via the bearing members f and g. A hole j is provided in the shaft member i, and a substantially disk-shaped hub member b is integrally fixed to the shaft member i.
Further, the magnetic disk a is mounted on the hub member b.

The recording disk a is mounted on the hub member b in this way by a so-called center clamp method. That is, the magnetic disk a is placed on the hub member b, a substantially disk-shaped clamp member c is attached to the hub member b from above, and then the mounting screw d is tightened and fixed in the hole j. FIG. 5 shows a state in which the magnetic disk a is pressed and fixed to the hub member b.
The recording disk a is rotationally driven by the armature m fixed to the outer peripheral portion of the cylindrical portion k and the field magnet n arranged on the inner peripheral wall of the hub member b.

[0004]

By the way, recently,
Many portable notebook type personal computers and the like having a built-in recording disk drive device such as a magnetic disk are now commercially available. In addition, there is a demand for further thinning, and in order to meet such demand, it is necessary to similarly reduce the thickness of the built-in recording disk drive device (that is, reduce the height of h2 in FIG. 5). There is. However, in the recording disk drive device having the above-described configuration, there is a limit to thinning the components such as the bearing members f and g, the armature m, and the field magnet n. This leads to a decrease in strength, and eventually in efficiency.

The present invention has been made in view of the above-mentioned problems existing in the prior art. The problem is that the required driving force, the rigidity of the device, and the like are required. An object of the present invention is to provide a recording disk drive device that can be made thinner without damaging it.

[0006]

In order to achieve the above object, in a recording disk drive device of the present invention, a fixing member, a hub member rotatably supported by the fixing member, and a hub member mounted on the hub member. A recording disk drive device including: a recording magnetic disk section, a field magnetic pole section is provided on one surface of the recording disk, and the fixing member faces the rotational axis direction of the field magnetic pole section. A recording disk drive device is provided, which is provided with arranged armatures.

Further, there is provided a recording disk drive device characterized in that the fixing member is a base member which defines a disk chamber in which the recording disk is accommodated.

[0008]

According to the above construction, since the magnetic field pole portion is provided on one surface of the recording disk, the magnetic field pole portion does not have the hub member, that is, the dimension in the height direction of the hub member. The armature is directly opposed to the armature provided on the fixing member without being affected. Therefore, the thickness can be reduced without impairing the required volume of the field magnetic pole portion, which is a driving force generating element, and the armature. The field magnetic pole portion and the armature are arranged so as to face each other in the rotation axis direction, so that the space in the radial direction of the rotation axis is substantially free from dimensional restrictions. Therefore, it is possible to reduce the thickness of an internal member such as a bearing member without unnecessarily reducing the size.

Further, since the fixing member is the base member which defines the disk chamber in which the recording disk is accommodated, the number of parts, the number of assembling steps, etc. can be reduced, and the production efficiency can be improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a recording disk drive device according to the present invention will be described with reference to FIGS. Figure 1
Is a drive device for a recording disk (for example, a magnetic disk is mounted) as a first embodiment of the present invention, and the drawing shows a sectional view of the left half thereof. In FIG. 1, reference numeral 3 is a bracket forming a fixing member. The bracket 3 has a shallow dish shape made of, for example, a magnetic stainless steel, and a base portion 40 at the center thereof has a cylindrical portion 10 provided substantially coaxially with a rotation axis 39. It is formed integrally.
Ball bearings 4, 5 are mounted on the inner peripheral surface 33 of the cylindrical portion 10. On the other hand, the outer peripheral edge portion of the bracket 3 43
A base member 11 of the recording disk drive device is attached to and is integrally fixed by a mounting screw or the like (not shown).

The lid 1 of the magnetic disk drive of this embodiment
8 is a joint portion 28, through the seal member 17,
It is fixed integrally with the base member 11. This lid 1
8 and the base member 11 define an internal closed space, that is, the disc interior space 41. The disk chamber 41 is filled with clean air. Next, 2 is a hub member that is driven to rotate, and is made of, for example, an aluminum material, and is formed into a substantially disc shape. The hub member 11 is
A shaft portion 4 provided coaxially for rotational support and a flange portion 13 for mounting the magnetic disk 1 are integrally and coaxially formed.

The pair of ball bearings 4 and 5 are fitted on the outer peripheral surface 4 of the shaft portion 4. Therefore, the hub member 2 is rotatably supported by the bracket 3 which is a fixed member. The magnetic disk 1 is mounted on the flange 13 of the hub member 2 while being coaxially positioned by the step 27.
Further, the rotation axis 39 of the hub member 2 is provided with a hole 14, and the hole 14 is tightened by a mounting screw 9 via a clamp member 15. As a result, the pressing portion 24 formed on the outer peripheral edge of the clamp member 15 presses the upper surface 25 of the magnetic disk 1, and the magnetic disk 1 is held and fixed to the hub member 2. As shown in FIG. 1, the pressing portion 24 has an arc-shaped cross section, and when the mounting screw 9 is tightened, it is elastically urged to uniformly press the upper surface 25 of the magnetic disk 1 over the entire circumference. be able to.

A magnetic head (not shown) is accessed on the upper surface 25 of the magnetic disk 1, and data is read / written on the upper surface 25. On the other hand, the field magnet 8 is mounted on the lower surface 26 of the magnetic disk 1 via the yoke member 16. The field magnet 8 is formed in a ring shape by using, for example, a rare earth magnet as a field magnetic pole portion. This field magnet 8
Is magnetized in the direction of the rotation axis 39, and N poles and S poles of a predetermined number of magnetic poles are alternately arranged in the circumferential direction. The yoke member 16 is made of, for example, a ferromagnetic material such as permalloy steel and formed in a thin plate shape and in an annular shape.
It serves as a holding and fixing member for the field magnet 8 and effectively suppresses a leakage magnetic flux transmitted from the field magnet 8 toward the upper surface 25 (that is, the recording surface side) of the magnetic disk 1.

The bracket 3 is opposed to the field magnet 8.
The armature 7 is provided on the flat portion 23. The armature 7 is arranged to face the field magnet 8 with a slight gap (about 0.3 mm) in the direction of the rotation axis 39. The armature 7 is formed by arranging a predetermined number of air core windings formed in a substantially triangular shape in an annular shape, and the flexible circuit board 1
It is affixed and fixed on 9 Flexible circuit board 1
9, a wiring pattern not shown is provided, and the terminal lead wire 29 of the winding is soldered (31) to a land portion 30 on the pattern provided at a predetermined portion and electrically connected. .. The end 20 of the flexible circuit board 19 is led out of the drive device through a hole 22 provided in the bracket 3. The member 21 fitted in the hole 22 is a bush made of an insulating material such as resin, and the end 20 of the flexible circuit board 19 is
Insulates from the bracket 3 and holds the disk chamber 4
1 functions as a seal member for ensuring the hermeticity.

As described above, the field magnet 8 is the magnetic disk 1
The magnetic disk 1 serves as a data recording medium and also serves as a mounting member for the field magnet 8. Therefore, as compared with the structure of the field magnet attached to the conventional hub member, the height (thickness) dimension of the hub member is substantially not included in the recording disk drive device of the present embodiment, and the drive characteristics are reduced. Can be thinned without changing. (The height is h1 in FIG. 1 as compared with h2 in FIG. 3.) Further, the field magnet 8 and the armature 7 are arranged in the direction of the rotation axis 39.
Are opposed to each other, there are few dimensional restrictions in the radial direction of the rotation axis 39, and the field magnet 8 and the armature 7 and the like can be thinned without unnecessarily downsizing the bearing member and the like. Also, the rigidity can be secured.

In FIG. 1, a portion 44 is a labyrinth seal mechanism. The labyrinth seal mechanism 44 includes the annular projections 36, 3 formed integrally with the base 40 of the bracket 3.
7 and the cylindrical portion 10 and the like, and the annular hanging portions 35 and 34 also integrally formed on the hub member 2 and the hanging protruding members such as the collar portion 13 closely face each other in a combined state. It is arranged. Therefore, by the labyrinth seal mechanism 44, it is effective that the unclean air containing fine particles of the lubricant and the like in the ball bearings 5 and 6 flows out to the disc indoor space 41 communicating with the unclean air through the gap 42. Can be prevented. Reference numeral 12 is a seal member attached to the lower end of the cylindrical portion 10 of the bracket 3. The seal member 12 closes the opening space of the cylindrical portion 10 to further enhance the effect of the labyrinth seal mechanism 44.

Next, FIG. 2 shows a second embodiment of the recording disk drive device according to the present invention and is a sectional view showing the left half of the magnetic disk drive device. The same members and parts used in FIG. 1 are given the same numbers. In the present embodiment, the configuration contents different from those of the magnetic disk drive device shown in FIG. 1 (first embodiment) will be described, and the overlapping contents will be omitted.

In the second embodiment, a base member 60 that defines the disk interior space 41 is used as the fixing member. On the other hand, in the first embodiment used in FIG. 1, the disk interior space 41 is defined by the bracket 3 and the base member 11 integrally fixed to the bracket 3. In FIG. 2, the base member 60 includes a base 64 provided with the bearing member 50, the labyrinth seal mechanism 44, and the like.
The flat portion 53 in which the armature 7 is arranged and the side wall 63 are integrally formed, and for example, stainless steel which is a magnetic material is used. With the base member 60 and the lid 18,
A disc chamber 41 is formed. The member 17 interposed in the joint portion 28 is a seal member.

In the flat portion 53 of the base member 60, the armature 7 is disposed on the sheet-shaped insulating member 51.
The terminal lead wire 57 of this winding is electrically connected to a conductive connection pin 58 provided through the flat portion 53, for example, by wrapping connection. The conductive connecting pin 58 is planted with the hermetic seal 52 provided in the hole 45 of the flat portion 53, and one end thereof extends to the lower side of the drawing (outside the driving device). The armature 7 is connected to the outside of the magnetic disk drive device by the conductive connection pin 58. When a non-magnetic material such as an aluminum material is used as the base member 60, a yoke member made of a ferromagnetic material (such as iron) is preferably provided between the base member 60 and the insulating member 51. Further, the armature 7 is a winding having an iron core to increase the torque.

A printed circuit board 62 is attached and fixed by a mounting screw 56 or the like below the flat portion 53 of the base member 60 (in FIG. 2), that is, outside the driving device. The printed circuit board 62 is provided to control the rotation of the magnetic disk drive device and is integrally attached to the base member 60. Predetermined conductive patterns are provided on both surfaces of the printed circuit board 62, and electronic components 54 and 55 are mounted thereon. Further, one end of the conductive connecting pin 58 from the armature 7 is inserted into the corresponding land 59 and electrically connected by soldering (61).

In addition to the above, the unit bearing 50 is mounted as a bearing member on the cylindrical portion 10 formed on the base portion 64 of the base member 60, so that the parts can be simplified and downsized. Thus, in the magnetic disk drive device of the present embodiment,
Since the required members can be directly assembled to the base member 60, the number of parts, the number of assembling steps, the part management, etc. are reduced. Therefore, similar to the first embodiment, it is possible to reduce the thickness and improve the production efficiency.

Although the embodiments of the recording disk drive device according to the present invention have been described above, the present invention is not limited to such embodiments, and various modifications and corrections can be made without departing from the scope of the present invention. Is. For example, in this embodiment, the recording disk 1 and the field magnet 8 are separate bodies,
These may be integrally formed of a magnetic material to form a flat plate, and one surface may be magnetized as necessary to form a magnetic field pole. By doing so, the thickness dimension of the field magnet 8 (including the yoke member 16 in FIGS. 1 and 2) can be reduced. Of course, the materials used for the recording disk 1 and other members can be freely selected.

Further, in this embodiment, the armature 7 and the field magnet 8 are arranged and provided at a portion relatively close to the rotation axis 39. However, without being limited to this, for example, by arranging in the vicinity of the outer peripheral edge portion of the recording disk 1, that is, by arranging the recording disk 1 in the radial direction from the rotation axis 39 (these armatures 7 and (If the space occupied by the magnets is the same), the rotational drive force will increase substantially
Moreover, a large space such as a bearing member can be secured. Further, two or more sets of such armature and field magnet may be provided.

In this embodiment, the armature 7 is provided as the fixing member on the bracket 3 or the base member 60, but the present invention is not limited to this, and the armature 7 is fixed to the lid 18 connected to the base member 60. However, a field magnetic pole portion may be provided on the upper side of the recording disk 1 so as to face it. In addition, it goes without saying that the base member 60 shown in the second embodiment may have a shape up to the flat portion 53, or conversely, may have a shape including the lid body 18 integrally. Yes.

[0025]

The recording disk drive device of the present invention has the above-mentioned structure, and the field magnetic pole portion is provided on one surface of the recording disk, and the electric field magnetic pole portion is opposed to the field magnetic pole portion in the rotation axis direction. A child is arranged, and the recording disk is driven by the relative rotation thereof. Therefore, the field magnetic pole portion and the armature are arranged to face each other without the intervention of the hub member or the like, so that the dimension in the height direction (rotation axis direction) can be reduced and the thickness can be reduced. Further, the space in the radial direction of the rotation axis is substantially free from dimensional restrictions, so that it is not necessary to make the bearing member and other members contained therein smaller than necessary. That is, it is possible to obtain a highly reliable recording disk drive device that can be thinned without impairing various necessary characteristics such as predetermined driving force and rigidity of the device.

Further, since the base member is integrated with the accommodating portion for accommodating the recording disk, the productivity and the space saving can be reduced and the recording disk driving apparatus suitable for thinning can be achieved. Is obtained.

[Brief description of drawings]

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

FIG. 2 is a sectional view showing a second embodiment of the recording disk drive device according to the present invention.

FIG. 3 is a cross-sectional view showing a conventional recording disk drive device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 recording disk 2 hub member 3 bracket (fixing member) 4 shaft part 5,6 ball bearing 7 armature 8 field magnet (field magnetic pole part) 9 mounting screw 11,60 base member (fixing member) 15 clamp member 18 lid Body 19 flexible circuit board

Claims (2)

[Claims] 1. A recording disk drive device comprising: a fixing member; a hub member rotatably supported by the fixing member; and a recording disk mounted on the hub member, wherein one surface of the recording disk. A recording magnetic disk drive device, wherein a field magnetic pole portion is provided on the fixed member, and an armature is provided on the fixed member so as to face the rotational axis direction of the field magnetic pole portion. 2. The recording disk drive device according to claim 1, wherein the fixing member is a base member that defines a disk chamber in which the recording disk is accommodated.