JP2001043658A - Disk storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the making of a band winder and the making of noise quiet by the enhancing of the rigidity of a top cover and the making of the construction of this device to be a construction in which components are held by both sides as to an HDD whose thickness is thin. SOLUTION: In a construction in which an SPM fixing shaft 16, a pivot fixing shaft 21 of an actuator 13 and an upper yoke 23 of a VCM are respectively fixed, a construction of this disk storage device is made to be the construction in which self-adhering viscoelastic materials 19, 22, 27 are held respectively at a gap between the SPM fixing shaft 16 and a top cover 15, the gap between the pivot fixing shaft 21 and the cover 15 and the gap between the upper yoke 23 and the cover 15. Acrylic materials can be used as viscoelastic materials. Since the top cover 15 is coupled by the viscoelastic materials 19, 22, 27, the rigidity of the cover is enhenced. Moreover, when respective mechanical elements vibrate, since respective viscoelectric materials whose both sides are held by rigid bodies generate large shearing deformation and the materials convert vibration energy into heat energy efficiently, the vibration and noise are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-capacity storage device for an information processing device, and more particularly to a rotating disk storage device such as a magnetic disk and an optical disk.

[0002]

2. Description of the Related Art A hard disk drive (hereinafter referred to as an HDD) among disk storage devices will be described below. FIG. 2 is an exploded perspective view showing the configuration of the HDD 101. In this HDD 101, a chassis 10 serving as a base
2, a rotary head actuator (hereinafter, simply referred to as an actuator) 103 and a spindle motor (hereinafter, S)
PM) 104 and the like.

[0003] The SPM 104 rotates around a ball bearing or a hydrodynamic bearing, and a fixed shaft type is generally used as the bearing structure. The stator of the SPM 104 is fixed to the chassis 102 by fastening means such as screws. However, a small HDD may be formed integrally with the chassis 102. A magnetic disk 105 is fixed to a rotor of the SPM 104 by a clamper 106.

The actuator 103 has a fixed pivot 107 fixed to its center of gravity, and one end of the shaft is fixed to the chassis 102 by fastening means such as screws.
The actuator 103 is a voice coil motor (hereinafter, referred to as a voice coil motor).
VCM). VCM is upper yoke 108,
It is composed of a fixed part composed of a lower yoke 109 and a magnet 110, and a moving coil 111. The lower yoke 109 is fixed to the chassis 10 by fastening means such as screws.
2, and the magnet 110 is fixed to one of the upper and lower yokes or the upper and lower yokes by bonding.

[0005] The upper yoke 108 is fixed to the chassis 102 or the lower yoke 109 by fastening means such as screws. However, in some small devices, the upper yoke 108 may be fixed only by the attractive force of the magnet 110. HDD 101 of FIG.
Adopts this structure. In FIG. 2, reference numeral 112 denotes a top cover.

[0006]

In recent years, HDDs have been reduced in size, and for example, PCMCIA TYPE II size HDDs have also appeared. However, this PCMCIA
TYPE II has a problem that it is difficult to keep the rigidity of the top cover because the thickness is as thin as 5 mm.

[0007] When the pivot fixed shaft of the actuator or the fixed shaft of the SPM has a double-supported structure in which a screw is fastened to the top cover, the resonance frequency increases, which is effective for improving the servo band. However, the PCMCIA TYPE II has a small thickness. Is as thin as 5 mm, so that it is difficult to take up space for the thickness of the screw, and there is also a problem that it is difficult to realize a double-sided structure.

Further, in the future, it is conceivable that a small HDD is mounted on a portable AV device. In such a device, a sound collecting device such as a microphone and each mechanical element are arranged close to each other. Is essential. However, in the current HDD, there is a problem that it is difficult to mount the HDD in a portable AV device because the rotation sound of the SPM and the seek sound of the actuator are loud.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to improve the rigidity of a top cover, particularly for a thin HDD, and to realize a wide band and a low noise by a double-sided structure. is there.

[0010]

In order to achieve the above object, in the HDD according to the present invention, (1) an SPM fixed shaft,
(2) The pivot fixed axis of the actuator, or (3)
In the structure in which the upper yoke of the VCM is fixed to the top cover, at least one of the members (1), (2) and (3) is fixed using an adhesive viscoelastic material.

That is, the HDD of the present invention is provided in the gap between the SPM fixed shaft and the top cover (first invention), in the gap between the pivot fixed shaft of the actuator and the top cover (second invention), or above the VCM. A third embodiment has a structure in which an adhesive viscoelastic material is sandwiched between the yoke and the top cover.

Specifically, the first invention (see FIG. 1; second)
The same applies to the invention to the seventh invention), the chassis 12 and
Fixed shaft spindle motor 14 and top cover 15
The stator of the spindle motor 14 is rigidly fastened to the chassis 12. The fixed shaft 16 of the spindle motor 14 has an end opposite to the chassis 12 and a top cover 15.
A viscoelastic material 19 having an adhesive property is sandwiched between the
The disk storage device is characterized in that an end of the fixed shaft 16 on the side opposite to the chassis 12 and the top cover 15 are fixed by the viscoelastic material 19.

In the first invention, the spindle motor 14
The gap between the end of the fixed shaft 16 and the top cover 15 is
In the free state, the thickness is preferably smaller than the thickness of the viscoelastic material 19.

The second invention has a chassis 12, a rotary head actuator 13, and a top cover 15,
The head actuator 13 is rotatable around a fixed pivot 20 using two bearings. One end of a fixed shaft 21 (pivot fixed shaft) of the pivot 20 is fastened to the chassis 12, and the pivot fixed shaft 21 A viscoelastic material 22 having an adhesive property is interposed between the top cover 15 and the end of the viscoelastic material 2 opposite to the chassis 12.
The disk storage device is characterized in that an end of the pivot fixed shaft 21 on the side opposite to the chassis 12 and the top cover 15 are fixed by 2.

In the second invention, the gap between the end of the pivot fixed shaft 21 and the top cover 15 is preferably smaller than the thickness of the viscoelastic material 22 in the free state.

The third invention comprises a chassis 12, a VCM (voice coil motor) using upper and lower yokes 23, 24 and a magnet 25, and a top cover 15. The upper yoke 23 of the VCM is a lower yoke 24 or Chassis 1
2 is fixed to the upper yoke 23 and the top cover 15 by an adhering force of a fastening means or a magnet 25, and an adhesive viscoelastic material 27 is sandwiched between the upper yoke 23 and the top cover 15.
, The upper yoke 23 and the top cover 15 are fixed to each other.

In the third aspect, the gap between the upper yoke 23 and the top cover 15 is preferably smaller than the thickness of the viscoelastic material 27 in the free state.

The fourth invention has a chassis 12, a rotary head actuator 13, a fixed spindle motor 14, and a top cover 15, and the head actuator 13 has a fixed shaft using two bearings. Of the spindle motor 1
The stator 4 is rigidly fastened to the chassis 12, and an adhesive viscoelastic material 19 is sandwiched between the top cover 15 and the end of the fixed shaft 16 of the spindle motor 14 on the side opposite to the chassis 12, The fixed shaft 1 is formed by the viscoelastic material 19.
6 and the top cover 15 are fixed to the opposite end, and one end of a fixed shaft 21 of the pivot 20 is fastened to the chassis 12.
A viscoelastic material 22 having an adhesive property is sandwiched between the end on the opposite side to the top cover 15 and the end of the fixed shaft 21 on the opposite side to the chassis 12 and the top cover 15 by the viscoelastic material 22. Is fixed to the disk storage device.

The fifth invention comprises a chassis 12, a fixed spindle motor 14, a top cover 15, a VCM using upper and lower yokes 23, 24 and a magnet 25, wherein the stator of the spindle motor 14 is a chassis. 1
2 and the fixed shaft 1 of the spindle motor 14
A viscoelastic material 19 having adhesive properties is sandwiched between the end of the chassis 6 opposite to the chassis 12 and the top cover 15, and the viscoelastic material 19 allows the fixed shaft 16 to be connected to the end of the fixed shaft 16 opposite to the chassis 12. The top cover 15 is fixed, and the upper yoke 23 of the VCM is connected to the lower yoke 24 or the chassis 1.
2 is fixed to the upper yoke 23 and the top cover 15 by an adhering force of a fastening means or a magnet 25, and an adhesive viscoelastic material 27 is sandwiched between the upper yoke 23 and the top cover 15.
, The upper yoke 23 and the top cover 15 are fixed to each other.

The sixth invention comprises a chassis 12, a rotary head actuator 13, a top cover 15, a VCM using upper and lower yokes 23, 24 and a magnet 25. One end of a fixed shaft 21 of the pivot 20 is fastened to the chassis 12, and the other end of the fixed shaft 21 on the opposite side to the chassis 12 is connected to the top of the fixed shaft 21. A viscoelastic material 22 having an adhesive property is sandwiched between the covers 15, and the end of the fixed shaft 21 on the opposite side to the chassis 12 and the top cover 1 are sandwiched by the viscoelastic material 22.
5, and the upper yoke 23 of the VCM is fixed to the lower yoke 24 or the chassis 12 by a fastening means or an attractive force of a magnet 25, and the upper yoke 23 and the top cover 15 have adhesiveness. Viscoelastic material 27
And the upper yoke 23 and the top cover 15 are fixed by the viscoelastic material 27.

The seventh invention comprises a chassis 12, a rotary head actuator 13, a fixed spindle motor 14, a top cover 15, a VCM using upper and lower yokes 23, 24 and a magnet 25. The stator of the spindle motor 14 is rigidly fastened to the chassis 12, and the fixed shaft 16 of the spindle motor 14
A viscoelastic material 19 having an adhesive property is interposed between the end opposite to the chassis 2 and the top cover 15, and the end of the fixed shaft 16 opposite to the chassis 12 and the top cover 15 are sandwiched between the viscoelastic material 19. The head actuator 13 is rotatable around a fixed shaft 20 using two bearings. One end of a fixed shaft 21 of the pivot 20 is fastened to the chassis 12, and A viscoelastic material 22 having an adhesive property is sandwiched between the end opposite to the chassis 12 and the top cover 15.
Thus, the end of the fixed shaft 21 on the opposite side to the chassis 12 and the top cover 15 are fixed. Further, the upper yoke 23 of the VCM is fixed to the lower yoke 24 or the chassis 12 by fastening means or the attractive force of the magnet 25, A disk storage device characterized in that an adhesive viscoelastic material 27 is sandwiched between the upper yoke 23 and the top cover 15, and the upper yoke 23 and the top cover 15 are fixed by the viscoelastic material 27. Device.

[0022]

Embodiments of the present invention (according to the seventh invention) will be described with reference to the drawings. Although various technically preferable limitations are given in this embodiment, the scope of the present invention is limited to these limitations unless otherwise specified in the following description. Instead, various modifications and changes are possible within the scope of the matters described in the claims.

FIG. 1 is an exploded perspective view showing the configuration of the HDD 11. This thin HDD 11 is made of PCMCIA.
It is of TYPE II size and size, and its thickness is 5 mm. In the HDD 11, an actuator 13, an SPM 14, and the like are mounted on a chassis 12 serving as a base, and have a structure in which the HDD 13 is sealed by a top cover 15. A fixed shaft bearing is used for the SPM 14, and the upper end of the SPM fixed shaft 16 is exposed from the uppermost portion of the SPM 14. The upper end of the SPM fixed shaft 16 should be designed to take up as much area as possible.

The stator of the SPM 14 is fixed to the chassis 12 by fastening means such as screws, or is formed integrally with the chassis 12. The SPM14 rotor has
A magnetic disk 17 is fixed by a clamper 18. It is designed so that there is a slight clearance (for example, about 50 to 100 μm) between the upper end of the SPM fixed shaft 16 and the top cover 15. The first viscoelastic material 19 having adhesiveness is inserted into the clearance (gap), which is a feature of the present invention (first invention).

The thickness of the first viscoelastic material 19 is preferably slightly larger (for example, about 50 μm) than the gap in order to prevent peeling. This difference in thickness is absorbed by the deformation of the top cover 15 and the collapse (compression deformation) of the viscoelastic material 19. Therefore, when designing the HDD 11, it is necessary to estimate the deformation (deformation allowance) of the top cover 15.

The material used for the viscoelastic material 19 needs to have a damping property and an adhesive property. As a material satisfying both, for example, an acrylic adhesive material is preferable. Viscoelastic material 1
Reference numeral 9 denotes a sheet-like double-sided pressure-sensitive adhesive tape, which is practically supplied with a release paper on both sides, but is used inside a HDD which is extremely sensitive to silicone-based gas. Preferably, the release paper does not contain silicone.

A fixed pivot 20 is fixed to the center of gravity of the actuator 13, and one end of the shaft is connected to the chassis 12.
Are fixed by fastening means such as screws. It is designed so that there is a slight clearance between the upper end of the pivot fixed shaft 21 and the top cover 15. Then, the second viscoelastic material 22 is inserted into this gap,
This is the feature of the present invention (second invention). It is preferable that the upper end portion of the pivot fixed shaft 21 also has an area as large as possible. It is preferable that the thickness of the second viscoelastic material 22 is slightly larger than the gap in order to prevent peeling.

The actuator 13 is driven by the VCM. The VCM includes a fixed portion including an upper yoke 23, a lower yoke 24, and a magnet 25, and a moving coil 26. The lower yoke 24 is fixed to the chassis 12 by fastening means such as screws. The magnet 25 is fixed to the lower yoke 24 by bonding.
It is designed so that there is some clearance between the upper yoke 23 and the top cover 15. The third viscoelastic material 27 is inserted into this gap, which is a feature of the present invention (third invention). This third viscoelastic material 2
The thickness of 7 is preferably slightly thicker than the above gap to prevent peeling.

Since the respective mechanical elements are connected by the first, second and third viscoelastic members 19, 22, 27, the rigidity of the top cover 15 is improved. Also,
When these mechanical elements vibrate, the viscoelastic materials 19, 22, and 27 having both ends sandwiched by rigid bodies have a large "shear deformation".
And vibration energy is efficiently converted into heat energy, so that vibration and noise are reduced. Each viscoelastic material 1
Since the frequency easily absorbed by 9, 22, and 27 depends on the thickness and hardness of the viscoelastic material, various viscoelastic materials are prepared.
It is desirable to perform optimization by repeating trial and error.

[0030]

As apparent from the above description, the following effects can be obtained according to the present invention. (1) Effects of the First Invention In the HDD according to the present invention, in the structure for fixing the SPM fixed shaft to the top cover, the SPM fixed shaft is fixed by using an adhesive viscoelastic material. Rigidity is improved. In addition, a double-sided structure of the SPM fixed shaft is realized, and the servo band can be increased. Further, when the SPM fixed shaft is vibrating, the viscoelastic material undergoes shear deformation and absorbs vibration energy.
The resonance peak of M decreases. As a result, there is an effect that the servo band is increased and the noise level due to the SPM is reduced (quiet noise can be reduced). Furthermore, when the top cover is vibrating, the viscoelastic material undergoes shear deformation and absorbs vibration energy, so that the resonance peak of the top cover is reduced and noise reduction is achieved.

(2) Effect of the Second Invention In the HDD according to the present invention, in the structure for fixing the pivot fixing shaft of the actuator to the top cover, the pivot fixing shaft is fixed using an adhesive viscoelastic material. As a result, the rigidity of the top cover is improved. In addition, a double-supported structure of the actuator pivot fixed shaft is realized, and the servo band can be increased. Further, when the actuator is vibrating, the viscoelastic material undergoes shear deformation and absorbs vibration energy, so that the resonance peak of the actuator is reduced. As a result, there is an effect that the servo band is increased and the noise level caused by the actuator is reduced (quiet operation is possible). Furthermore, when the top cover is vibrating, the viscoelastic material undergoes shear deformation and absorbs vibration energy, so that the resonance peak of the top cover is reduced and noise reduction is achieved.

(3) Effect of the Third Invention In the HDD according to the present invention, in the structure in which the upper yoke of the VCM is fixed to the top cover, the upper yoke is fixed using an adhesive viscoelastic material. The rigidity of the top cover is improved. In addition, when the top cover is vibrating, the viscoelastic material undergoes shear deformation and absorbs vibration energy, so that the resonance peak of the top cover is reduced and noise reduction is achieved.

(4) Effects of the Fourth to Seventh Inventions The fourth invention is a combination of the first and second inventions, and the fifth invention is a combination of the first and third inventions. The sixth invention is a combination of the second invention and the third invention, and the seventh invention is a combination of the first invention, the second invention, and the third invention. Therefore, for example, according to the fourth aspect, the effect of the first aspect and the effect of the second aspect can be simultaneously obtained. Further, according to the seventh invention, the effects of the first invention, the second invention, and the third invention can be simultaneously obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of an HDD according to the present invention.

FIG. 2 is an exploded perspective view showing a configuration of a conventional HDD.

[Explanation of symbols]

11 HDD, 12 chassis, 13 actuator, 14 spindle motor, 15 top cover, 1
6: SPM fixed shaft, 17: magnetic disk, 18: clamper, 19: first adhesive viscoelastic material, 20: pivot, 21: pivot fixed shaft, 22: second adhesive viscoelastic material , 23 ... upper yoke, 24 ... lower yoke, 25 ... magnet, 26 ... moving coil, 27 ... third adhesive viscoelastic material, 101 ... HDD, 102 ... chassis, 103 ... actuator, 104 ... spindle motor, 105: magnetic disk, 106: clamper, 107
... Pivot, 108 ... Upper yoke, 109 ... Lower yoke, 1
10: magnet, 111: moving coil, 112
… Top cover

Claims (10)

[Claims] 1. A spindle, a fixed spindle motor, and a top cover, wherein a stator of the spindle motor is rigidly fastened to a chassis, and an end of a fixed shaft of the spindle motor opposite to the chassis. A viscoelastic material having adhesiveness is sandwiched between the top cover and the top cover, and the end of the fixed shaft opposite to the chassis and the top cover are fixed by the viscoelastic material. Disk storage device. 2. A head actuator comprising: a chassis; a rotary head actuator; and a top cover, wherein the head actuator is rotatable around a fixed-shaft pivot using two bearings. One end of the shaft is fastened to a chassis, and an adhesive viscoelastic material is sandwiched between the end of the fixed shaft on the side opposite to the chassis and the top cover, and the viscoelastic material allows the fixed shaft to be fixed to the chassis. A disk storage device, wherein an opposite end and the top cover are fixed. 3. A VC comprising a chassis, a VCM using upper and lower yokes and a magnet, and a top cover.
The upper yoke M is fixed to the lower yoke or the chassis by fastening means or the attracting force of the magnet, and an adhesive viscoelastic material is sandwiched between the upper yoke and the top cover. A disk storage device, wherein the upper yoke and the top cover are fixed. 4. A chassis, a rotary head actuator, a fixed shaft spindle motor, and a top cover, wherein the head actuator rotates about a fixed shaft pivot using two bearings. Freely, the stator of the spindle motor is rigidly fastened to the chassis, and an adhesive viscoelastic material is sandwiched between the end of the fixed shaft of the spindle motor opposite to the chassis and the top cover, The viscoelastic material fixes the end of the fixed shaft opposite to the chassis and the top cover, and further has one end of the fixed shaft of the pivot fastened to a chassis, and the end of the fixed shaft opposite the chassis. A viscoelastic material having an adhesive property is sandwiched between the portion and the top cover, and the viscoelastic material causes the end of the fixed shaft opposite to the chassis and the top cover to move. A disk storage device, wherein a bar is fixed. 5. A spindle motor having a chassis, a fixed shaft spindle motor, a top cover, a VCM using upper and lower yokes and a magnet, wherein a stator of the spindle motor is rigidly fastened to a chassis. A viscoelastic material having an adhesive property is sandwiched between the end of the fixed shaft opposite to the chassis and the top cover, and the end of the fixed shaft opposite to the chassis and the top cover are sandwiched by the viscoelastic material. The upper yoke of the VCM is fixed to the lower yoke or the chassis by fastening means or the attraction force of the magnet, and an adhesive viscoelastic material is sandwiched between the upper yoke and the top cover. Wherein the upper yoke and the top cover are fixed by the viscoelastic material. 6. A chassis including a chassis, a rotary head actuator, a top cover, a VCM using upper and lower yokes and a magnet, wherein the head actuator is centered on a fixed shaft type pivot using two bearings. One end of a fixed shaft of the pivot is fastened to a chassis, and an adhesive viscoelastic material having an adhesive property is sandwiched between the end of the fixed shaft opposite to the chassis and the top cover. An end of the fixed shaft opposite to the chassis and the top cover are fixed by a viscoelastic material, and an upper yoke of the VCM is fixed to a lower yoke or the chassis by fastening means or an attractive force of the magnet.
A disk storage device, wherein a viscoelastic material having an adhesive property is sandwiched between the upper yoke and the top cover, and the upper yoke and the top cover are fixed by the viscoelastic material. 7. A chassis including a chassis, a rotary head actuator, a fixed spindle motor, a top cover, a VCM using upper and lower yokes and magnets, wherein a stator of the spindle motor is rigidly attached to the chassis. Fastened, a viscoelastic material having adhesiveness is sandwiched between the end of the fixed shaft of the spindle motor on the side opposite to the chassis and the top cover. The end and the top cover are fixed, and the head actuator is rotatable around a fixed pivot using two bearings. One end of a fixed shaft of the pivot is fastened to a chassis, and the fixed An adhesive viscoelastic material is sandwiched between the end of the shaft opposite to the chassis and the top cover. An end opposite to the chassis and the top cover are fixed, and an upper yoke of the VCM is fixed to a lower yoke or the chassis by fastening means or an attractive force of the magnet. A disk storage device, wherein a viscoelastic material having an adhesive property is sandwiched between the upper yoke and the top cover. 8. The disk storage device according to claim 1, wherein a gap between an end of a fixed shaft of the spindle motor and the top cover is smaller than a thickness of the viscoelastic material in a free state. . 9. The disk storage device according to claim 2, wherein a gap between an end of the pivot shaft and the top cover is smaller than a thickness of the viscoelastic material in a free state. 10. The disk storage device according to claim 3, wherein a gap between the upper yoke and the top cover is smaller than a thickness of the viscoelastic material in a free state.