JP2000192955A - Bearing device for disk drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively restrain peripheral directional vibration of a head by providing a holding member arranged in a sleeve, and including a damper for absorbing vibrational energy by a movement of a moving body. SOLUTION: A damper 8 has a moving body 13 and an annular holding member 14. When a sleeve 4 vibrates in the peripheral direction, the moving body 13 rolls on an upper surface 24 of the bottom 21, so that vibrational energy is dissipated by a movement of the moving body 13. This moving body 13 slides on the upper surface 24 of the bottom 21, and contacts with an inner peripheral surface composed of these side surfaces 22, 23 and the upper surface 24, so that the vibrational energy is dissipated by the frictional force. The moving body 13 moves and happens to collide with a partition wall 16, impact force of such a collision operates as force opposed to inertia force of the sleeve 4, and is useful for stopping a peripheral directional movement of the sleeve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device for a disk drive and a head drive device for a disk drive using the bearing device for a disk drive. The present invention relates to a configuration called a pivot bearing cartridge or the like that supports an arm to which a head for reading or writing the contents of a store is attached so as to be angularly displaceable.

[0002]

2. Description of the Related Art In a disk drive device, a head is attached to one end of an arm in order to read or write stored contents on one surface of a disk-shaped recording medium which is driven to rotate. The end is supported by a disk drive bearing device, and the other end of the arm is driven by an electromagnetic force, such as a voice coil, so that the arm is angularly displaced and the head moves in the radial direction of the disk. Then, the head is positioned on a desired track. In a head assembly including a head and an arm, vibration in a circumferential direction occurs due to an impact force by a voice coil for positioning the head on a desired track in a short time. The track width of the disk is designed to be small in order to increase the recording density. Therefore, it is necessary to suppress the circumferential vibration of the head as much as possible, that is, it is necessary to rapidly attenuate the vibration and to suppress the amplitude of the remaining vibration to a small extent, otherwise, the processing characteristics of the disk drive deteriorate.

[0003] In various technical fields, dampers have conventionally been used in order to suppress radial vibration of a rotating body, and for example, a configuration in which a bearing that supports the rotating body is supported by an elastic body has been adopted. However, in the disk drive, there is no prior art for suppressing the circumferential vibration generated during the search and positioning of the disk by the head.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a disk drive bearing device capable of effectively suppressing circumferential vibration of a head and a disk drive head drive device using the same. To provide.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a disk drive bearing device for supporting an arm on which a head is mounted so as to be capable of angular displacement, wherein (a) a fixed shaft and (b) a fixed shaft are inserted through the arm. (C) a bearing that supports the sleeve on a fixed shaft so as to be angularly displaceable along the same axis as the fixed shaft, and (d) a damper, wherein the moving body and the sleeve A bearing space for movably accommodating in the circumferential direction, a holding member provided on the sleeve, and a damper for absorbing vibration energy by movement of the moving body. It is.

According to the present invention, the arm on which the head is mounted is mounted on a sleeve, which is supported on a fixed shaft by a bearing so as to be angularly displaceable, and the head is mounted on a track formed on the surface of the disk. Store contents can be read or written. A damper is provided for the head, the arm, and the sleeve to suppress circumferential vibration around the axis of the fixed shaft. The damper is configured such that the moving body is stored in a storage space extending in a circumferential direction of a holding member provided in the sleeve. When the head is searching for a disk, when the sleeve is angularly displaced at high speed, the moving body rolls in the storage space due to inertia,
Alternatively, the moving body and the holding member are relatively displaced and moved in frictional contact with the inner peripheral surface of the storage space. The kinetic energy of the movement of the moving body absorbs and attenuates the vibration energy of the sleeve and hence the head.

The frequency of vibration of the sleeve in the circumferential direction of the disk drive is low, for example, about several tens of Hz. Therefore, the moving body is likely to move in the circumferential direction in the storage space of the holding member. Vibration energy can be dissipated.

[0008] The moving object stored in the continuous storage space is
The number may be one, but may be plural. In a configuration in which a plurality of moving bodies are stored in a continuous storage space, the moving bodies collide with each other due to the vibration of the sleeve. The collision of the moving bodies also absorbs and dissipates the vibration energy of the sleeve. As a result, the vibration energy is greatly attenuated in a short decay time, and the amplitude of the remaining vibration can be further reduced.

The moving body may be made of metal, synthetic resin, rubber, or the like, and may be rigid or elastic.

The moving body is provided so as to be movable not only in the above-described circumferential direction but also in the radial direction in the storage space of the holding member, and the vibration energy of the sleeve in the radial direction is also moved by the movement of the moving body. It may be configured to absorb by frictional contact and also by collision.

The holding member may be symmetric with respect to the axis 5 of the fixed shaft, and the damper including the movable body 13 and a partition wall 16 which will be described later may be symmetric with respect to the axis.

Further, the present invention is characterized in that the storage space is circumferentially partitioned by a partition wall, and the moving body is stored in each of the partitioned space portions.

According to the present invention, the storage space has a plurality of space portions partitioned by partition walls, and each space portion has:
A single moving body or a plurality of moving bodies are respectively stored.
The moving body moves in the circumferential direction in each space portion due to the vibration of the sleeve, and collides with the partition wall. The acceleration of the angular displacement of the sleeve is large, and the impact force generated by the moving body colliding with the partition wall helps stop the movement as a force opposing the inertial force of the moving body, and greatly attenuates vibration energy. And the vibration damping effect is great. Thereby, the vibration energy of the sleeve is also absorbed and dissipated by the collision between the moving body and the partition wall. Therefore, the decay time of the vibration energy can be further reduced, and the amplitude of the remaining vibration can be further reduced.

Further, the present invention is characterized in that a plurality of moving bodies are housed in each space portion.

According to the present invention, a plurality of moving bodies are housed in the respective space portions, whereby the moving bodies move when the sleeve vibrates, and the moving bodies collide with each other. Thereby, the vibration energy can be efficiently absorbed and dissipated. The damping effect can be further increased by the collision of a plurality of moving objects. In another embodiment of the present invention, each space portion may accommodate a single moving body.

Further, the present invention is characterized in that the partition wall can be displaced in the storage space by a collision of a moving body.

According to the present invention, the partition wall is provided so as to be displaced in the circumferential direction in the storage space when the moving body moves and collides due to the vibration of the sleeve. As a result, the relatively large vibration of the sleeve is caused by the movement of the partition wall.
Vibration energy can be efficiently dissipated. When the sleeve vibrates, the partition wall is not displaced in the circumferential direction relative to the holding member when the moving body does not collide. When the vibration of the sleeve is intense, the partition wall may be displaced in the circumferential direction relatively to the holding member.
Large vibration energy can be efficiently absorbed.

Further, the present invention is characterized in that a liquid is stored in the storage space. According to the present invention, the liquid is stored in the storage space, and the vibration energy of the sleeve is consumed by the relative displacement between the moving body and the liquid and the relative displacement between the liquid and the inner peripheral surface of the storage space. can do. The liquid may be, for example, a viscous liquid, for example made of silicone oil. The liquid may be water, alcohol, or the like. Instead of a liquid, it may be a powder.

Further, the present invention is characterized in that the damper further comprises a cushioning member made of a resilient material and interposed between the sleeve and the holding member.

According to the present invention, the holding member is attached to the sleeve via a resilient cushioning member. Such a cushioning member may be an O-ring made of a material such as rubber. Thus, the holding member vibrates via the cushioning member due to the vibration of the sleeve. Therefore, the vibration energy of the sleeve is also consumed by the vibration of the holding member.

Further, the present invention is characterized in that the moving body is spherical. According to the present invention, by making the moving body spherical, it is easy to manufacture many such moving bodies with the same configuration, the productivity is excellent, the tolerance of the moving body is reduced, and A moving body with high accuracy can be manufactured. As a result, a damper having no variation in damping characteristics can be easily realized. Such a spherical moving body may be made of a metal material such as stainless steel, iron or the like, and the moving body 13 may also be made of a metal material having a high specific gravity, for example tungsten, so that the sleeve 4 Can be effectively absorbed, or can be made of a synthetic resin material.

The present invention is also characterized in that a pair of bearings are arranged at intervals in the axial direction of the fixed shaft, and a damper is arranged between these bearings.

According to the present invention, the damper is disposed between the pair of bearings spaced apart in the axial direction of the fixed shaft, and thus the outer peripheral surface of the fixed shaft on the inner peripheral surface of the sleeve. The damper can be arranged by effectively utilizing the relatively narrow space between the two, and the configuration can be downsized.

Further, the present invention is characterized in that a plurality of dampers are sequentially arranged in the axial direction.

According to the present invention, a plurality of dampers are sequentially arranged and mounted in the axial direction of the sleeve, so that the vibration energy of the sleeve can be more efficiently dissipated by the plurality of dampers. Become.

Further, according to the present invention, (a) a head, (b) an arm to which the head is attached at one end, (c) a fixed shaft, and (d) the other end of the arm are attached, and the fixed shaft is inserted. (E) a bearing that supports the sleeve on a fixed shaft having the same axis as the fixed shaft and capable of angular displacement.
(F) A damper, which has a moving body, and a storage space in which the moving body is housed so as to be movable in a circumferential direction of the sleeve, and has a holding member provided in the sleeve. A disk drive head drive device comprising: a damper that absorbs; and (g) a drive unit that drives the other end of the arm to be angularly displaced around the axis of a fixed shaft.

According to the disk drive head driving device of the present invention, the vibration energy of the head, arm and sleeve is effectively absorbed by the damper, the vibration damping time is reduced, and the amplitude of the remaining vibration is reduced. Can be smaller. Therefore, when the head searches for the disk, the arm, and thus the sleeve, is angularly displaced at high speed,
Even when the acceleration is large, vibration of the head, arm and sleeve can be suppressed. Therefore, reading and writing of a disk having a relatively small track width can be performed accurately and in a short time.

[0028]

FIG. 1 is a simplified longitudinal sectional view of a disk drive bearing device 1 according to one embodiment of the present invention. The disk drive bearing device 1 can be referred to as a pivot bearing cartridge. The disk drive bearing device 1 includes a fixed shaft 3 erected and fixed on a chassis 2 of the disk drive device, and a sleeve 4 through which the fixed shaft 3 is inserted. And a pair of bearings 6 and 7 for supporting the sleeve 4 so that the sleeve 4 has the same axis as the axis 5 of the fixed shaft 3 so as to be angularly displaceable, and absorbs vibration energy of the sleeve 4 in the circumferential direction. And a damper 8. The axis 5 of the fixed shaft 3 is, for example, a vertical axis. As described above, the bearings 6 and 7 are arranged in pairs at intervals in the axial direction of the fixed shaft 3. The damper 8 is arranged between these bearings 6,7.

FIG. 2 is an enlarged sectional view of a part of the disk drive bearing device 1 shown in FIG. The bearing 6 includes an inner ring 9 fixed to the outer peripheral surface of the fixed shaft 3, an outer ring 10 fixed to the inner peripheral surface of the sleeve 4, and the inner ring 9 and the outer ring 1.
This is a rolling bearing such as a ball bearing having a rolling element 11 such as a ball interposed between the rolling element 11 and a radial force and a thrust force. Another bearing 7 also has a configuration similar to that of bearing 6.

A plurality of (for example, two in this embodiment) dampers 8 are sequentially arranged in the axial direction (vertical direction in FIGS. 1 and 2). As shown in FIG. 2, the damper 8 is provided between an annular projection 29 formed on the inner peripheral surface of the sleeve 4 so as to protrude inward in the radial direction and an annular support ring 30 attached to the sleeve 4. Thus, mutual displacement of the sleeve 4 in the axial direction is prevented.

FIG. 3 is a horizontal cross-sectional view of a part of the damper 8, and FIG. 4 is a sectional line A4--in FIG.
It is sectional drawing expanded in the circumferential direction seen from A4. Damper 8
Has a moving body 13 and an annular holding member 14. The moving body 13 is, for example, spherical in this embodiment,
Each of the plurality of moving bodies 13 has the same configuration. Holding member 14
Is fixed to the inner peripheral surface of the sleeve 4. The holding member 14 may be made of a metal such as iron, or may be made of a synthetic resin material, and is rigid.

The holding member 14 is formed with a storage space 18 having a plurality of upwardly open space portions 17 extending in the circumferential direction and partitioned by a partition wall 16. Holding member 14
The partition wall 16, the inner peripheral wall 19, the outer peripheral wall 20,
And a bottom 21. The partition wall 16 is integrally formed with the inner peripheral wall 19, the outer peripheral wall 20, and the bottom 21. The circumferential length of each of the plurality of space portions 17 is the same, and a single moving body 13 is stored in each of the storage spaces 17.
The moving body 13 is movable in the circumferential direction in each space portion 17, and the circumferential length between the partition walls 16 forming the space portion 17 is larger than the outer diameter of the moving body 13. The side surface 22 of the inner peripheral wall 19 forming the space portion 17 and the outer peripheral wall 2
0 is larger than the outer diameter of the moving body 13 so that the moving body 13
While being able to move smoothly in the circumferential direction within 7,
It can also move radially. Moving body 13
Moves in the circumferential direction to absorb the vibration energy of the sleeve 4 in the circumferential direction, and moves the moving body 13 in the radial direction to absorb the vibration energy of the sleeve 4 in the radial direction. The upper surface 24 of the bottom 21 is perpendicular to the axis 5 and is, for example, a horizontal plane in the use state of this embodiment. The axis 5 may be used inclined with respect to the vertical plane, and the present embodiment may be used in a state where the axis 5 is horizontal, for example.

When the sleeve 4 vibrates in the circumferential direction, the moving body 13 rolls on the upper surface 24 of the bottom 21 and the moving body 1
The movement of 3 dissipates the vibration energy. In addition, the moving body 13 slides on the upper surface 24 of the bottom 21 and comes into contact with the inner peripheral surface formed by the side surfaces 22 and 23 and the upper surface 24, and the vibrational energy is dissipated by the frictional force. Further, the moving body 13 may move and collide with the partition wall 16, and the impact force of such collision acts as a force opposing the inertial force of the sleeve 4, and stops the circumferential movement of the sleeve 4. Useful.

In another embodiment of the present invention, a plurality of moving bodies 13 may be accommodated in each space portion 17. Accordingly, when the circumferential vibration of the sleeve 4 occurs, the moving bodies 13 collide with each other, and the vibration energy is also dissipated by such a collision.

FIG. 5 is a sectional view of a part of a holding member 14 according to another embodiment of the present invention. This embodiment is similar to the embodiment shown in FIGS. 1 to 4 described above, and corresponding parts are denoted by the same reference numerals. FIG. 5 corresponds to FIG. 4 described above. FIG. 6 is a plan view showing a part of the damper 8 according to another embodiment of the present invention shown in FIG. It should be noted that in this embodiment, the partition wall 16a is provided in the storage space of the holding member 14 so as to be displaceable in the circumferential direction. The base end of the partition wall 16a is integrally connected to the upper surface 24 of the bottom 21 and protrudes. On both sides of the partition wall 16a, gaps 49 and 50 are formed between the inner peripheral wall 19 and the inner peripheral surface of the outer peripheral wall 20. Therefore, the partition 16a
Can be bent and deformed as shown by the imaginary line 28 due to the elasticity of a material such as a synthetic resin constituting the holding member 14. Due to the vibration of the sleeve 4, the moving body 13 moves relative to the holding member 14 in the circumferential direction in the space portion 17, whereby the moving body 13 is moved to the partition wall 16a.
5, the partition wall 16 a is elastically deformed and
, And displaces in the circumferential direction. Also by such elastic deformation of the partition wall 16a, the circumferential vibration energy of the sleeve 4 is more efficiently absorbed. Other configurations and operations are the same as those of the above-described embodiment.

FIG. 7 is a partial sectional view of still another embodiment of the present invention. This embodiment is based on FIGS.
Similar to the embodiment of FIG. 4, corresponding parts are denoted by the same reference numerals. It should be noted that in this embodiment, a liquid 25 is stored in each space portion 17. The moving body 13
It is immersed in the liquid 25. The holding member 14 has a liquid 25
Cover 26 so as not to leak from the space portion 17 to the outside.
Is attached, and the storage space 18 is made airtight. With such a configuration, the vibration energy can be more efficiently absorbed by the contact between the outer peripheral surface of the moving body 13 and the liquid 25 and by the movement of the liquid 25 in each space portion 17. The partition wall 16 may be configured to be able to be resiliently displaced similarly to the partition wall 16a shown in FIGS. 5 and 6 described above.

FIG. 8 is a horizontal sectional view showing a holding member 14b according to still another embodiment of the present invention. Holding member 14
b has a cylindrical space portion 17b opened upward,
Each space portion 17b is partitioned by a partition wall 16b between the space portions 17b. Inside each space portion 17b, a spherical moving body 1 having an inner diameter less than the inner diameter of the space portion 17b is provided.
3 are stored. Other configurations are the same as those of the above-described embodiment. When the sleeve 4 vibrates in the circumferential direction, the moving body 13 is displaced in the circumferential direction in the space portion 17b, and can absorb the vibration energy. Other configurations are the same as those of the above-described embodiment.

FIG. 9 is a horizontal sectional view showing a holding member 14c according to still another embodiment of the present invention. This embodiment is similar to the embodiment of FIG. 8, and corresponding parts are denoted by the same reference numerals. As shown in FIG. 10, the space portion 17c formed in the holding member 14c has a substantially right-bottomed cylindrical shape with an open bottom, and is circumferentially partitioned by a partition wall 16c. The space portion 17c is opened radially inward by a notch 27. In the embodiment of FIG. 9, a notch 27 is present. The spherical moving body 13 is housed in the upper surface 24 of the bottom 21 in the space portion 17c.

In the embodiment shown in FIGS. 9 and 10, since the notch 27 is formed, the space portion 17c is formed.
In this case, the moving body 13 is also largely displaced in the radial direction, so that the energy of the radial vibration of the sleeve 4 can also be effectively absorbed. This notch 27
Is smaller than the outer diameter of the moving body 13, so that the moving body 13 does not go outside through the notch 27.

FIG. 11 is an enlarged sectional view of a part of still another embodiment of the present invention. Although this embodiment is similar to the embodiment of FIGS. 1 to 4 described above, in particular, in this embodiment, the outer diameter of the outer peripheral wall 20 of the holding member 14 of the damper 8 is different from that of the inner peripheral surface of the sleeve 4. Less than the inner diameter of The outer peripheral wall 20 and the bottom 21 of the damper 8 are provided on the sleeve 4 with buffer members 31, 32, and 33 realized by O-rings made of a material such as rubber having elasticity. The outer peripheral wall 20 and the bottom 21 of the holding member 14 can support the buffer members 31, 32, and 33, respectively.
The inclined support surfaces 34 and 35 are formed. Each of the holding members 14 arranged vertically in FIG. 11 is supported by the buffer member 32 so as not to contact each other. Accordingly, the displacements of the holding members 14 do not interfere with each other, the displacements in the respective directions become possible, and the vibration energy can be effectively absorbed. Thus, the holding member 14 can be vibrated by the vibration of the sleeve 4, and the vibration energy of the sleeve 4 can be absorbed by the vibration of the holding member 14.

Further, the cushioning members 31, 32, 33
Allow the holding member 14 to be displaced up and down and to be displaced in a radial direction perpendicular to the axis 5. This also makes it possible to absorb the energy of vertical and radial vibrations.

FIG. 12 is a partial sectional view of another embodiment of the present invention. This embodiment is described in FIGS.
And the corresponding parts are denoted by the same reference numerals. In this embodiment, the holding member 14 is provided with a plurality of moving bodies 13 vertically stacked, for example, in a row.
Are stacked and housed in the space portion 13. In this manner, many moving bodies 13 may be housed in the respective space portions 17 so as to absorb the vibration energy of the sleeve 4 due to mutual collision. Other configurations are the same as those of the above-described embodiment.

FIG. 13 is a horizontal sectional view of another embodiment of the present invention, and FIG. 14 is a perspective view of a part of the holding member 14 in the embodiment shown in FIG. In this embodiment, the holding member 14 has the same configuration as the holding member 14 shown in FIGS. Particularly, in this embodiment, an arc-shaped elongated moving body 37 is accommodated in each space portion 17 so as to be movable in the circumferential direction. Moving body 37
Is made of metal, may be made of synthetic resin or rubber, and may be rigid.
It may have elasticity. The moving body 37 can make frictional contact with the upper surface 24 of the bottom 21 in the space portion 17 of the holding member 14, and further, the side surface 22 of the inner peripheral wall 19 and the outer peripheral wall 2.
0 can be brought into frictional contact with the side surface 23. Thereby, the vibration energy of the sleeve 4 can be effectively dissipated.

FIG. 15 is a partial longitudinal sectional view of still another embodiment of the present invention. This embodiment is similar to the embodiment of FIGS. 1 to 4 described above, and corresponding parts are denoted by the same reference numerals. In this embodiment, not only the damper 8 is interposed between the bearings 6 and 7, but also
, That is, on the side opposite to the chassis 2 (see FIG. 1), the damper 8 d is fixed to the sleeve 4. The damper 8 d includes the moving body 13 and the holding member 14.
From the storage space 18 of the holding member 14
A lid 26 is provided to prevent the falling out. This lid 26 is attached to the upper part of the holding member 14. That is, in this embodiment, the damper 8d is provided further above the upper bearing 6, so that the vibration energy can be further absorbed, and the bottom 21 of the holding member 14
And seals the oil migration of the lubricating oil generated from the bearing 6 to create a clean disk drive device.

In the embodiment of FIGS. 7 to 15 described above, the partition wall 16 is the same as the partition wall 16 of FIGS. 5 and 6 described above.
It may be configured to be able to move in the circumferential direction as in the case of a, and the liquid 25 may be stored in the space portion 17 as shown in FIG.

In another embodiment of the present invention, the aforementioned partition walls 16, 16a may be omitted.

FIG. 16 is a simplified perspective view of a disk drive head drive device 39 according to one embodiment of the present invention. A head assembly 42 is provided for reading or writing data stored in tracks on the surface of a disk 41 such as a hard disk, which is a disk-shaped recording medium. The disk 41 is driven to rotate by a spindle motor. The head assembly 42 includes a head 43 as a conversion element such as a magnetic head for reading and writing the disk 41, an arm 44 to which the head 43 is attached at one end in the longitudinal direction, and a bearing at the other end. Apparatus 1
And a driving means 45 for driving angular displacement about the axis 5 described above. The driving means 45 may be constituted by, for example, a voice coil fixed to the other end of the arm 44 and a magnet provided at a fixed position magnetically coupled to the voice coil. The other end of the arm 44 is fixed to the sleeve 4 of the bearing device 1. Thus, the driving means 45 is
Is driven angularly, the head 43 can be displaced in the radial direction of the disk 41 to search for a desired track.

The vibration generated by the high-speed movement of the arm 44 is absorbed by the above-described damper 8 provided on the sleeve 4 of the bearing device 1 and the head assembly 42
The stationary time of the angular displacement positioning operation can be reduced. Further, the amplitude of the head assembly 42 at the time of resonance can be reduced. The bearing device 1 may be any of the embodiments shown in FIGS.

FIG. 17 is a diagram showing a damping state of the circumferential vibration of the sleeve 4 when the present invention is applied. FIG.
(1) shows characteristics obtained when the vibration energy is attenuated in the disk drive head drive device 39 shown in FIG. 16 using the bearing device 1 shown in FIGS. After the head assembly 42 reaches the desired track of the disk 41 at time t1, after a relatively short time W1, the amplitude thereof reaches a predetermined small level L1, which is an allowable amplitude, and the amplitude of the remaining vibration A1 is very slightly suppressed. On the other hand, in the configuration in which the damper 8 of the present invention is not mounted, the amplitude reaches the predetermined level L1 from the time t1 when the head 43 reaches the desired track of the disk 41, as shown in FIG. 17A is longer than the time W1 shown in FIG. 17A, and thereafter, the amplitude A2 of the residual vibration is relatively long.
It continues larger than the amplitude of (1). Thus, the damper 8 of the present invention includes the sleeve 4 and thus the head assembly 4.
2, the vibration energy in the circumferential direction can be effectively absorbed. In order to obtain such good characteristics, the mass ratio μ between the arm 44, the head 43 and the moving body 13 and the moving body It is necessary to appropriately select and set the ratio ν between the gap between the movable body 13 and the partition 16 and the vibration amplitude of the movable body, the coefficient of restitution e between the movable body 13 and the partition 16, and the like.

FIG. 18 is a graph showing characteristics of the present invention in the embodiment described with reference to FIG.
For example, by selecting the materials of the moving body 13 and the partition wall 16 so that the coefficient of restitution e becomes an optimum value of e = 0.2 to 0.3, the amplitude of the head assembly 42 can be varied over a wide frequency range. , Are suppressed to a relatively small amplitude as shown by line 46. On the other hand, in the configuration described with reference to FIG. 17B without the damper 8, a large amplitude at the time of resonance occurs as shown by the line 47.
Thus, by using the damper 8 of the present invention, the amplitude at the time of resonance can be suppressed low, and the processing characteristics of the disk drive are greatly improved.

[0051]

According to the first aspect of the present invention, the vibration energy in the circumferential direction of the head, arm and sleeve can be absorbed and attenuated by the damper. Is easily possible,
The reading and writing processes by the head of a disk having a small track width can be performed accurately and in a short time. As the moving body moves in the circumferential direction in the storage space of the holding member, the vibration energy is absorbed and dissipated as described above, so that the damping time of the circumferential vibration of the sleeve is reduced and the sleeve remains. The amplitude of the vibration can be reduced, and the processing characteristics of the disk drive can be improved.

The frequency of such circumferential vibration of the sleeve is relatively low, so that the movable body is easily moved in the circumferential direction in the storage space of the holding member, and the movement of the movable body efficiently reduces the vibration energy. Can be absorbed.
Furthermore, the moving body slides without rolling in contact with the inner peripheral surface of the storage space, and the frictional contact can also absorb vibration energy. Thus, the head can be accurately positioned at a desired track on the disk at a high speed. Further, a plurality of moving bodies are stored in the continuous storage space, and the vibration energy can be efficiently absorbed by the mutual collision of the moving bodies.

According to the second aspect of the present invention, the storage space is divided into a plurality of space portions by the partition wall, and the moving body is housed in each space portion, so that the moving body moves when the sleeve vibrates. Thus, it collides with the partition wall, and this collision can also absorb vibration energy more efficiently.

According to the third aspect of the present invention, a plurality of moving bodies are housed in the plurality of space portions, respectively. Therefore, not only do the moving bodies collide with the partition wall, but also due to the mutual collision of the moving bodies. Vibration energy can be more efficiently absorbed.

According to the fourth aspect of the present invention, the partition wall can be displaced in the storage space. Therefore, when the moving body collides with the partition wall, the partition wall comes into frictional contact with the inner peripheral surface of the storage space, Vibration energy can be more efficiently absorbed.

According to the fifth aspect of the present invention, the liquid is stored in the storage space, whereby the vibration energy can be consumed by the contact between the moving body and the liquid and by the movement of the liquid in the storage space. become able to. When the liquid has viscosity, the vibration damping effect can be further improved.

According to the sixth aspect of the present invention, the damper is attached to the sleeve via the resilient buffer member, whereby the holding member vibrates and is displaced by the vibration of the sleeve, and the vibration energy of the sleeve is reduced. Furthermore, it can be absorbed more efficiently.

According to the seventh aspect of the present invention, by using the spherical moving body, the manufacturing cost can be reduced, the tolerance can be reduced, and the moving body having the same shape with high precision can be easily manufactured. As a result, a desired vibration damping characteristic can be accurately obtained without variation.

According to the present invention, a damper is disposed between the pair of bearings, and the damper is disposed in a relatively narrow space between the inner peripheral surface of the sleeve and the outer peripheral surface of the fixed shaft. Therefore, the configuration can be downsized.

According to the ninth aspect of the present invention, the vibration energy of the sleeve is absorbed by each damper by arranging a plurality of dampers on the sleeve sequentially in the axial direction, and thus the vibration energy is efficiently absorbed. Will be able to do it.

According to the tenth aspect of the present invention, when the head moves to a desired track of the disk at a high speed, the vibration is attenuated in a short time, and the amplitude of the remaining vibration is reduced, whereby The processing characteristics of reading and writing can be improved, and the stationary time due to the positioning movement of the head can be reduced.

[Brief description of the drawings]

FIG. 1 is a simplified longitudinal sectional view of a disk drive bearing device 1 according to an embodiment of the present invention.

FIG. 2 is a disk drive bearing device 1 shown in FIG.
3 is an enlarged vertical sectional view of a part of FIG.

FIG. 3 is a horizontal sectional view of a part of the damper 8;

FIG. 4 is a sectional view of the damper 8 developed in a circumferential direction as viewed from a cutting plane line A4-A4 in FIG.

FIG. 5 is a partial cross-sectional view of a holding member according to another embodiment of the present invention.

6 is a plan view of a part of the holding member 14 according to the embodiment of the present invention shown in FIG.

FIG. 7 is a partial cross-sectional view of still another embodiment of the present invention.

FIG. 8 shows a holding member according to still another embodiment of the present invention.
It is a horizontal sectional view showing b.

FIG. 9 shows a holding member according to still another embodiment of the present invention.
It is a horizontal sectional view showing c.

FIG. 10 is a perspective view showing a holding member 14c of FIG.

FIG. 11 is an enlarged sectional view of a part of still another embodiment of the present invention.

FIG. 12 is a partial longitudinal sectional view of another embodiment of the present invention.

FIG. 13 is a horizontal sectional view of another embodiment of the present invention.

FIG. 14 is a perspective view of a part of the holding member 14 in the embodiment shown in FIG.

FIG. 15 is a partial longitudinal sectional view of another embodiment of the present invention.

FIG. 16 is a simplified perspective view of a disk drive head drive device 39 according to an embodiment of the present invention.

FIG. 17 is a diagram showing a damping state of vibration in the circumferential direction of the sleeve 4 when the present invention is applied.

FIG. 18 is a graph showing characteristics when the present invention is applied in the embodiment described in relation to FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc drive bearing device 2 Chassis 3 Fixed shaft 4 Sleeve 5 Axis 6, 7 Bearing 8 Damper 13, 37 Moving body 14 Holding member 16 Partition wall 17 Space part 18 Storage space 25 Liquid 31, 32, 33 Buffer member 39 Disk drive Head driving device 41 disk 42 head assembly 43 head 44 arm 45 driving means

Claims (10)

[Claims] 1. A disk drive bearing device for supporting an arm to which a head is attached so as to be angularly displaceable, comprising: (a) a fixed shaft; (b) a sleeve through which the fixed shaft is inserted and to which the arm is attached; A) a bearing for supporting the sleeve on the fixed shaft so as to have the same axis as the fixed shaft so as to be angularly displaceable; and (d) a damper; A bearing device for a disk drive, comprising: a holding member provided with a sleeve, wherein the holding space is formed in the sleeve, and a damper for absorbing vibration energy by movement of the moving body. 2. The disk drive bearing according to claim 1, wherein the storage space is partitioned by a partition wall in a circumferential direction, and the moving body is stored in each of the partitioned space portions. apparatus. 3. The bearing device for a disk drive according to claim 2, wherein a plurality of moving bodies are respectively housed in each space portion. 4. The disk drive bearing device according to claim 2, wherein the partition wall can be displaced in the storage space by a collision of the moving body. 5. The disk drive bearing device according to claim 1, wherein a liquid is stored in the storage space. 6. The damper according to claim 1, further comprising a cushioning member made of a resilient material and interposed between the sleeve and the holding member. Disk drive bearing device. 7. The disk drive bearing device according to claim 1, wherein the movable body is spherical. 8. The disk drive bearing device according to claim 1, wherein a pair of bearings are arranged at intervals in the axial direction of the fixed shaft, and a damper is arranged between these bearings. 9. A plurality of dampers are sequentially provided in the axial direction.
9. The disk drive bearing device according to claim 1, wherein the bearing device is arranged. (A) a head, (b) an arm to which the head is attached at one end, (c) a fixed shaft, and (d) a sleeve to which the other end of the arm is attached and through which the fixed shaft is inserted. (E) a bearing that supports the sleeve on the fixed shaft so as to be angularly displaceable along the same axis as the fixed shaft; and (f) a damper, which moves the moving body in the circumferential direction of the sleeve. (G) a damper that has a holding member provided on the sleeve and that absorbs vibration energy by moving the moving body; and (g) moving the other end of the arm around an axis of a fixed shaft. And a driving means for performing angular displacement driving.