JPH04349265A - Fixed structure for magnetic disk - Google Patents

Abstract

PURPOSE:To miniaturize the fixed structure of the magnetic disk in a magnetic disk device and to realize the thinning of the device by reducing the number of components for fixing at least one magnetic disk to a spindle hub and simplifying the fixed structure attending on the miniaturizing and thinning of the magnetic disk device concerning the fixed structure of the magnetic disk in the magnetic disk device. CONSTITUTION:In the structure for fixing the magnetic disk 6 to a rotatable spindle hub 5, the magnetic disk 6 is fixed to the above-mentioned spindle hub 5 by adhesives 21, and without using the fixed parts such as a clamping member and a screw, the fixed structure is made thin.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk fixing structure in a magnetic disk device used as an external storage device for a computer system, and more particularly to a magnetic disk fixing structure that is advantageous for making magnetic disk devices smaller and thinner. It is.

As magnetic disk drives become smaller, there is a demand for smaller and thinner structures for fixing magnetic disks to rotatable spindle hubs.

0003

2. Description of the Related Art A magnetic disk fixing structure in a conventional magnetic disk device, as shown in a side cross-sectional view of a main part in FIG. A magnetic disk 6 is fitted into a spindle hub 5 mounted via a pair of upper and lower bearings 3 and 4, and the magnetic disk 6 is fixed by tightening a clamp member 7 to the spindle hub 5 with a screw 8. The spindle hub 5 to which the magnetic disk 6 is fixed is rotationally driven by a drive motor composed of a rotor 9 provided at the bottom thereof and a stator 10 provided on the base body 1 corresponding to the rotor 9. ing.

In addition, as a fixing structure for a plurality of magnetic disks, as shown in the cross-sectional side view of the main part in FIG.
A plurality of magnetic disks 15 are attached to a spindle hub 14 mounted via spacer rings 1 and 13, respectively.
6, these plurality of magnetic disks 15
The spacer ring 16 is fixed by tightening a clamp member 17 to the spindle hub 14 with a screw 18.

The spindle hub 14 to which the plurality of magnetic disks 15 are fixed includes a stator 20 provided around the central fixed shaft 11 and a stator 20 provided on the inner peripheral surface of the spindle hub 14 corresponding to the stator 20. It is rotationally driven by a drive motor constituted by a rotor 19.

[0006]

By the way, in the magnetic disk fixing structure as described above, the single magnetic disk 6 or the plurality of magnetic disks 15 fitted into the spindle hub 5 or 14 are fixed. Clamp member 7
Since it is fixed by screwing (17), the clamping member 7 (17) and the screwing part protrude from the upper surface of the spindle hub 5 (14), so the height of this fixing structure is increased accordingly. As a result, the height of the magnetic disk device also increases, making it difficult to make the device smaller and thinner.

[0007] Furthermore, since a clamp member 7 (17) and a plurality of screws 8 (18) are required to fix the magnetic disk 6 (15), the number of structural parts increases, which also increases the number of installation steps. There was such a problem.

In view of the above-mentioned conventional situation, the present invention provides a novel structure that simplifies the structure for fixing a magnetic disk to a spindle hub, reduces the number of component parts, and makes it possible to reduce the thickness of the magnetic disk device. The purpose is to provide a fixing structure for magnetic disks.

[0009]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a structure in which a magnetic disk is fixed to a rotatable spindle hub, in which the magnetic disk is fixed to the spindle hub with an adhesive. do.

[0010] Also, the spindle hub and the magnetic disk are configured such that each adhesive surface in contact with each other is provided with a recessed portion for storing an adhesive. Further, in a structure in which a plurality of magnetic disks are fixed to a rotatable spindle hub via a spacer ring, the plurality of magnetic disks and the spacer ring are fixed to the spindle hub with an adhesive.

[0011] Furthermore, the spindle hub, the magnetic disk, and the spacer ring are each provided with a recessed portion on each adhesive surface in contact with each other to store an adhesive.

0012

[Operation] In the present invention, a single magnetic disk is adhesively fixed to a rotatable spindle hub, or a plurality of magnetic disks are attached to a rotatable spindle hub via a spacer ring and the spacer ring. Since it is fixed with adhesive and does not use any conventional fixing parts such as clamp members or multiple screws, the height of the fixing structure can be reduced and the number of fixing parts can be reduced. It becomes possible.

[0013] Furthermore, by providing a recessed portion for storing adhesive on each adhesive surface of the spindle hub and the magnetic disk, or the spindle hub, the magnetic disk, and the spacer ring that contact each other, the spindle hub can be attached to the magnetic disk or the spacer ring. When the spacer ring and the magnetic disk are bonded to the spindle hub with an adhesive, the recessed portion is filled with the adhesive to strengthen the adhesive strength.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a side sectional view of a main part showing a first embodiment of a magnetic disk fixing structure according to the present invention, and parts equivalent to those in FIG. 6 are given the same reference numerals.

The present embodiment shown in this figure is different from the conventional example shown in FIG. Instead of screwing and fixing a single magnetic disk 6 to the spindle hub 5 using a conventional clamp member, the single magnetic disk 6 is fitted and fixed with an adhesive 21 made of, for example, a light curing type. be.

According to this embodiment structure, the structure for fixing the magnetic disk 6 to the spindle hub 5 is simplified, and the number of component parts is reduced because the conventional clamp members and fixing screws are not required. Moreover, the fixing structure can be made thin.

FIG. 2 is a side sectional view of a main part showing a second embodiment of the magnetic disk fixing structure according to the present invention, and FIG.
The same parts are given the same symbols. The features of this embodiment shown in this figure are different from the conventional example shown in FIG.
A plurality of magnetic disks 15 and a spacer ring 16 are alternately attached to a spindle hub 14 mounted on a central fixed shaft 11 via a pair of upper and lower bearings 12 and 13 via an adhesive 21 made of a photocuring type or the like. It was then fitted and fixed with adhesive.

Such an embodiment structure also simplifies the structure for fixing a plurality of magnetic disks 15 to the spindle hub 14, and provides the same effects as the embodiment shown in FIG. Further, FIG. 3 is a side sectional view of a main part showing a modification of the first embodiment of the magnetic disk fixing structure according to the present invention, and the same parts as in FIG. 1 are given the same reference numerals.

The present embodiment shown in this figure is different from the first embodiment shown in FIG. A shaped recess 22 is provided, and when the magnetic disk 6 is bonded to the spindle hub 5 with an adhesive 21 made of a photocuring type or the like, the recess 22 is filled with the adhesive 21 to increase the adhesive strength between the two. That's what happened.

According to the structure of this embodiment, the magnetic disk 6 is firmly adhesively fixed to the spindle hub 5, and the structure can be simplified and made thinner. Further, FIG. 4 is a side sectional view of a main part showing a modification of the second embodiment of the magnetic disk fixing structure according to the present invention, and the same parts as in FIG. 2 are given the same reference numerals.

The present embodiment shown in this figure is different from the second embodiment shown in FIG. For example, when a recess 22 having a triangular cross section is provided and the spacer ring 16 and the magnetic disk 15 are bonded to the spindle hub 14 with an adhesive 21 made of a photocuring type or the like, the recess 22
This is because the adhesive 21 is filled with the adhesive 21 to increase the bonding strength between the two.

With this embodiment structure, the spacer ring 16 and the magnetic disk 15 can also be attached to the spindle hub 14.
can be firmly adhesively fixed, and its structure can be simplified and made thinner.

In the above embodiments, the adhesive 21 is evenly applied to each bonding surface of the spindle hub 5 and the magnetic disk 6, or the spindle hub 14 and the magnetic disk 15, and the spacer ring 16, which are in contact with each other. It needs to be fixed with adhesive.

As the adhesive 21, in addition to a photocurable adhesive, the adhesive in the close contact area that is not exposed to the outside air is cured by anaerobic curing, and the adhesive in the area exposed to the outside air is cured by ultraviolet rays (U).
V) It is preferable to apply an adhesive having both ultraviolet (UV) curability and anaerobic curability that can be cured by irradiation.

Further, the shape of the recessed portion 22 for storing the adhesive 21 provided on each bonding surface of the spindle hub 5 and the magnetic disk 6, or the spindle hub 14, the magnetic disk 15, and the spacer ring 16 that contact each other has the above-described cross-sectional shape. The shape is not limited to a triangular shape, but may be variously modified shapes such as a hemispherical cross section, a rectangular cross section, etc., and the recesses of these shapes may be continuous grooves. It is necessary to provide a plurality of these recesses on each adhesive surface, for example, so as to be evenly distributed in the circumferential direction with respect to the central fixed axis.

[0026] Adhesive 2 interposed on each of the adhesive surfaces described above
The need for equalization, uniform adhesive fixation, and even distribution of recesses is to minimize the unbalance phenomenon in which the bearing vibrates when the spindle hub to which the magnetic disk is adhesively fixed is rotated. This is to reduce

Furthermore, if an unbalance phenomenon occurs when the spindle hub to which the magnetic disk is adhesively fixed is rotated, the rotating body is placed on the test stand of the balance tester in order to prevent the generation of vibrations. The unbalance direction (phase angle) and the unbalance amount are measured to determine the unbalance correction position, and in this embodiment, as shown in FIG. 1
Adhesive made of a photo-curing type or thermo-curing type, or a photo-curing type or thermo-curing adhesive whose specific gravity is adjusted by mixing metal powder, etc., at the corrected position of the bonded part of the two, avoiding the recording track area on 5. Required amount of correction weight material 31 made of mold resin material etc.
By applying and curing the material, the imbalance is corrected and the adhesive fixation at that point is also reinforced.

[0028]

As is clear from the above description, according to the magnetic disk fixing structure of the present invention, the structure in which the magnetic disk is fixed to the spindle hub is simplified, and its height is reduced. The device can be made smaller and thinner. Furthermore, the number of component parts is reduced, and the number of man-hours for installing the magnetic disk can be reduced, which has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a main part showing a first embodiment of a magnetic disk fixing structure according to the present invention.

FIG. 2 is a sectional side view of a main part of a second embodiment of a magnetic disk fixing structure according to the present invention.

FIG. 3 is a sectional side view of a main part showing a modification of the first embodiment of the magnetic disk fixing structure according to the present invention.

FIG. 4 is a side sectional view of a main part showing a modification of the second embodiment of the magnetic disk fixing structure according to the present invention.

FIG. 5 is a perspective view for explaining correction of the unbalance phenomenon of the rotating body in the magnetic disk fixing structure according to the present invention.

FIG. 6 is a side sectional view of a main part showing an example of a conventional magnetic disk fixing structure.

FIG. 7 is a side sectional view of a main part showing another example of a conventional magnetic disk fixing structure.

[Explanation of symbols]

1 Base body 2, 11 Center fixed shaft 3, 4, 12, 13 Bearing 5, 14
Spindle hub 6, 15 Magnetic disk 9, 19 Rotor 10, 20 Stator 16 Spacer ring 21 Adhesive 22 Recess 31 Correction weight material

Claims (4)

[Claims] 1. In a structure in which a magnetic disk (6) is fixed to a rotatable spindle hub (5), the magnetic disk (6) is fixed to the spindle hub (5) using an adhesive (21).
A magnetic disk fixing structure characterized by being fixed by a magnetic disk. 2. An adhesive (21) is applied to each adhesive surface of the spindle hub (5) and the magnetic disk (6) that are in contact with each other.
2. The magnetic disk fixing structure according to claim 1, further comprising a recessed portion (22) for storing the magnetic disk. 3. In a structure in which a plurality of magnetic disks (15) are fixed to a rotatable spindle hub (14) via a spacer ring (16), a plurality of magnetic disks (15) are fixed to the spindle hub (14). 15) and a spacer ring (16) are fixed together using an adhesive (21). 4. A recess (22) for storing adhesive (21) is provided on each adhesive surface of the spindle hub (14), magnetic disk (15), and spacer ring (16) that contact each other. The magnetic disk fixing structure according to claim 3, characterized in that: