JP3198444B2 - Rotating disk storage device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating disk storage device, and more particularly to a thin rotating disk storage device in which the driving force of a head provided opposite to the surface of the rotating disk is increased.

[0002]

2. Description of the Related Art To increase the capacity of a magnetic disk drive, it is necessary to increase the linear bit density and the track density and to increase the number of disk recording surfaces. But,
If the data transfer speed is low even if the capacity of the device increases,
Not only can the capacity of the disk device not be fully utilized, but also a problem may occur. For this purpose, a method of increasing the recording density by reducing the flying height of the head and increasing the data transfer speed by increasing the rotation speed of the disk have been adopted. The data transfer speed is determined solely by the rotational speed of the disk, but the requirement for determining the data input / output speed includes the head access time. In order to shorten the access time, the weight of the movable part is reduced and the acceleration is increased. Therefore, it is necessary to increase the rigidity of the mechanism and enhance the damping effect. However, there is a limit in increasing the acceleration, and a significant reduction in access time cannot be expected. For this reason, a method has been adopted in which the number of heads per recording surface is increased to reduce the access distance, thereby greatly reducing the access time.

A known example is disclosed in Japanese Patent Application Laid-Open No. 63-114556.
JP, JP-A-63-124755, USP 47
39430, JP-B-2-4072, JP-A-57
JP-A-56151, JP-A-59-191175, JP-A-58-130468, and JP-A-58-2
No. 03675, US Pat. No. 4,743,987 and the like.

[0004]

In the above prior art, in the case of Japanese Patent Application Laid-Open No. 63-114556, since flat coils are vertically stacked, there is an effect that the magnetic flux can be made uniform, but the thickness in the stacking direction is increased. There is a disadvantage that the thickness becomes thicker. USP47
In Japanese Patent No. 39430, permanent magnets are arranged around the rotation axis of the head drive unit. In this system, however, the inertia moment of the permanent magnets increases, so that it is necessary to reduce the mounting radius of the permanent magnets. However, there is a disadvantage that the length is increased in the axial direction.
In Japanese Patent Publication No. 2-4072, a plurality of flat coils are arranged on a plane to reduce the size of the device. However, in this example, the disk and the head drive motor are arranged on the axis of the head drive shaft. At the end, the axial length of the device is substantially increased.

SUMMARY OF THE INVENTION It is an object of the present invention to increase the driving force without changing the thickness of the head driving unit, and to reduce the radial force acting on a fixed shaft on which the head driving unit is supported.
It is an object of the present invention to provide a rotating disk storage device suitable for a thin device which can be accessed at high speed.

[0006]

In order to achieve the above object, the present invention comprises a disk for recording information, a rotating support for the disk, and a disk drive for rotating the disk. A head supporting means provided to face a surface of the disk and supporting a head for reading and writing information; and a head driving means for moving the head to any different radial position on the disk. in rotating disk storage device, wherein the header
The driving means is a flat coil which is a head driving force generating means.
Divided into two parts and arranged in a direction almost 180 degrees with respect to the fixed axis.
And supported by coil supporting means .

[0007]

According to the above construction, the head driving force generating means is provided.
Divided into two flat coils, approximately 180 degrees to the fixed axis
The force generated in the coil is
Acts only as moment on the fixed shaft, and the radial force
Has almost no effect. As a result, the vibration of the head / support system
Reduction, thinner equipment, faster access, fixed
The radial force acting on the shaft can be reduced.
Also, for example, by mounting a disk, a disk support system, a disk drive system, a head support system, and a head drive system on the same base, and elastically supporting the base integral with the housing. In addition, the magnet reaction force acting on the head and the disk can be reduced to zero or minimized, the vibration of the disk and the head can be reduced, and the speed, the flying height, and the density can be increased .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a top plan view of one embodiment of the present invention. In FIG. 1, a disk 1 is fixed to a clamp 2 at an inner periphery, and a head 3 is held by a head support means 4 so as to face the disk 1 rotating around its central axis. Further, the head 3 held by the head support means 4 is guided and positioned so as to perform an access operation in an arc shape in the radial direction of the disk 1. An access operation of the head 3 is performed by a head driving means including a magnet 5 and a coil 6, that is, a so-called voice coil motor. Data is recorded concentrically on the outer circumference of the disk 1 and read / write is performed by a transducer mounted on the head 3.

Conventional head driving means is paired with a head,
Although the moment of inertia is balanced around a fixed axis for making the head access in an arc, the head driving force generated by the head driving means acts as a radial force on the fixed axis. Although this causes vibration of the system, in the present embodiment, as shown in FIG. By doing so, the force generated in the coil 6 acts only on the fixed shaft 30 as moment, and the radial force hardly acts. As a result, the vibration of the head / support system can be reduced, and the positioning of the head 3 can be speeded up and the accuracy can be improved.

The filter 10 is provided in the middle of the air flow in the apparatus caused by the disk 1, and removes dust generated in the apparatus from the air flow. It has the effect of preventing collision and damage. The fins 11 release heat generated from the coil 6 to the outside of the device, and can prevent the temperature of the device from rising. The stopper 9 is a means for keeping the rotation angle of the head driving means composed of the coil 6 and the magnet 5 within a predetermined range, and for preventing runaway of the head 3 with respect to the disk 1. In addition, magnet 5, housing base 1
2. The housing 7 is integrated as described later.

FIG. 2 is a sectional view of this embodiment. Supplementary explanation will be given for parts that could not be explained in FIG. Disk 1
The clamp 2 is fixed to a rotating shaft (spindle shaft) 17 by a clamp fixing member 16, and the spindle shaft 17 is supported by a spindle bearing 18 of the base 14. The disk 1 is attached to the magnet 20 fixed to the hub 31 and the base.
A motor constituted by a coil 19 fixed to the motor 14
Is driven to rotate.

On the other hand, the head driving means has already been described with reference to FIG. 1 and will not be described. However, the disk 1, the head 3 / head supporting means 4, and the head driving means, ie, the coil 6, are arranged on substantially the same plane. Fixed shaft 21 of drive means
Are supported by a fixed shaft bearing 22 of the base 14. In order to smoothly circulate the air flow in the apparatus, a linear guide protrusion 25 for guiding the air flow from the center of the disk 1 to the fixed shaft 21 of the head 3, the head supporting means 4 and the head driving means. Is provided on the lid 24. This causes the airflow caused by the disc 1 in the device
Since it passes through 0, dust in the air current is effectively removed.
The head supporting means 4 is fixed to a fixed shaft 21 of the head driving means via a head supporting means spacer 23.

The radial force acting on the fixed shaft 21 of the head driving means can be offset, but the momentum around the center of gravity of the entire housing acts due to the driving reaction force acting on the magnet 5. By this moment, the spindle shaft 17 for rotatingly driving and supporting the disk 1 and the fixed shaft 21 for the head driving means are provided.
Vibrates. As a result, there is a possibility that the positioning accuracy and the positioning speed may be reduced. Therefore, as shown in the embodiment of FIG. 2, the magnet 5 is fixed to the housing base 12, the housing base 12 and the housing 7 are integral, and supports the spindle shaft 17 and the fixed shaft 21 of the head driving means. The supporting base 14 is supported by the elastic supporting means 13 with respect to the housing base 12 so that the transmission of the head driving reaction force acting on the magnet 5 is eliminated or reduced, and the magnet 5 and the housing base 12 are transmitted. By integrating the housing 12 and the housing 7, the mass of the magnet 5 can be substantially increased. As a result, in the case of mutual free support, the vibration amplitude is determined by the ratio of the equivalent mass of the head support system to the mass of the magnet, so that the vibration amplitude can be suppressed to a smaller value by substantially increasing the magnet mass. . To achieve this, it is more effective to elastically support the entire housing with respect to the installation surface by the housing support means 15.

FIG. 3 shows a top plan view of the housing and base of the embodiment of FIG. With respect to a housing base 12 integral with the housing 7, a base 14 on which a spindle shaft and a head driving means fixed shaft are mounted is held by elastic supporting means 13. The elastic support means 13 absorbs the in-plane and out-of-plane forces transmitted from the magnet to the housing base 12 and reduces the forces transmitted to the spindle shaft, the head driving means, the disk, and the head. High-precision positioning becomes possible. Therefore, an effective structure is obtained by increasing the density.

FIGS. 4 and 5 show a state in which the elastic support means 13 is mounted between the housing base 12 and the base 14. FIG. The elastic support means may be a viscoelastic body such as a rubber material or a spring member.

FIGS. 6 and 7 show another embodiment of the elastic support means. The flange portions of the housing base 12 and the base 14 are overlapped with each other, and an elastic support member 13 is interposed therebetween. A magnet is fixed to the housing base 12, and a disc spindle shaft 17 and a head driving means are mounted on the base 14. And it is supported so as to be able to move relative to the housing base 12. Further, by supporting the magnet 5 elastically with respect to the housing base 12, the driving reaction force acting on the magnet transmitted to the disk spindle shaft 17 and the head driving means can be further reduced.

FIGS. 8 and 9 show a structure in which the magnet 5 is held on the housing base 12 by the elastic support means 27. FIG.
The elastic support means 27 is fixed to the housing base 12 by the fixing member 2.
8, the purpose of reducing the driving reaction force transmitted to the housing base 12 can be achieved by using a rubber member or a leaf spring shown in the drawing.

FIG. 10 is a top plan view of the rotating disk storage device. In this embodiment, the head 3 and the head supporting means 4 are 2
A pair is provided, and forms a symmetrical structure with the head driving means including the coil 6 and the magnet 5. This structure is head /
The rotation of the support system and the head drive means around the fixed shaft 21 is smoothed, which has the effect of reducing vibration. In addition, since two heads are provided on the same disk, the access distance is halved and the access time is greatly reduced. can do. Also,
A similar configuration may be applied to the upper and lower surfaces of the disk 1. Furthermore, the drive range of the coil 6 and the magnet 5 can be widened so that the two heads on the same surface side of the disk 1 can be used for both the inner and outer circumferences. In this case, the relationship between the mounting positions of the two heads must be smaller than 1/2 of the data area of the disk 1.

FIG. 11 shows an assembling procedure of the head, the head supporting means, and the head driving means.
The head support means 4 supported by the head support means spacer 23 is fixed by a fixing member. The head 3 is attached to the head support means 4 via a gimbal 26. When two heads are provided in the same plane of the disk, it is difficult to combine the head support system with the disk after assembling it. Therefore, it is easy to assemble by combining the first head supporting means, the disk, and the second head supporting means in this order.

FIG. 12 shows another example of the structure of FIG. As a method of symmetrically configuring the head / support system and the head driving means, the same configuration can be obtained even if the head supporting means 4 extends over both surfaces of the disk 1 along the fixed axis. The structure in which the head supporting means as shown in FIG. 1 is gathered on one side is a structure which is often seen in the related art. However, a symmetrical structure can further simplify the vibration mode. It is more advantageous in terms of vibration isolation than that.

FIG. 13 shows another structural example of the present invention. In this embodiment, the head driving means including the coil 6 and the magnet 5 and the head supporting means 4 and the like have a symmetrical structure around the fixed shaft 21 and a plurality of disk spindle shafts 17.
Is provided, the symmetry of the head drive means around the fixed axis 21 is secured in the entire housing, and more data areas of the disk can be accessed at high speed without increasing the thickness of the housing. Device. In the case of this embodiment, the center of gravity of the fixed shaft 21 of the head driving means and the housing can be made to coincide with each other, so that only the moment around the center of gravity acts.

FIG. 14 shows an example of a coil shape. In FIG. 1, the coil 6 is a flat coil in a rotation plane around the fixed shaft 21, but the example of FIG. 14 holds the coil in a vertical shape. In the case of this coil, as shown in FIG. 15, the point that three sides surrounding the magnetic core 29 of the coil can be used for generating a driving force is an advantage as compared with the flat coil.

FIG. 16 shows another example of the coil shape. FIG.
In the above, a plurality of pairs of coils are provided. However, if the coils are formed by an integrated flat coil 6, manufacture becomes easier. Further, it can be formed integrally with the fixed shaft. Further, the coil 6 may be held vertically as shown in FIG.

[0024]

According to the present invention, by arranging a plurality of flat coils around the fixed shaft, the radial force acting on the fixed shaft is reduced, and the driving force is increased with the same axial thickness. be able to. Further, the bearing for supporting the flat coil on the fixed shaft can be reduced in size, whereby the shaft length can be shortened and the overall device can be made thinner.

[Brief description of the drawings]

FIG. 1 is an upper plan view showing one embodiment of the present invention.

FIG. 2 is a sectional view of the present embodiment.

FIG. 3 is an upper plan view of a housing and a base according to the present embodiment.

FIG. 4 is a cross-sectional view of a base support portion of the present embodiment.

FIG. 5 is a diagram showing a method of mounting the base support means of the embodiment.

FIG. 6 is a sectional view showing another embodiment of the base supporting means.

FIG. 7 is a view showing a mounting method of the example shown in FIG. 6;

FIG. 8 is a sectional view showing another embodiment of the magnet support means.

FIG. 9 is a perspective view of the example shown in FIG. 8;

FIG. 10 is an upper plan view showing another embodiment of the present invention.

FIG. 11 is an assembly view of the head supporting means of the example shown in FIG. 10;

FIG. 12 is a configuration diagram showing another embodiment of the head support means.

FIG. 13 is an upper plan view showing another embodiment of the present invention.

FIG. 14 is a perspective view showing another embodiment of the coil.

FIG. 15 is a front view of the head driving unit of the example shown in FIG. 14;

FIG. 16 is a perspective view showing another embodiment of the coil.

FIG. 17 is a perspective view showing still another embodiment of the coil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc 2 Clamp 3 Head 4 Head supporting means 5 Magnet 6 Coil 7 Housing 8 Coil supporting means 9 Stopper 10 Filter 11 Fin 12 Housing base 13 Elastic supporting means 14 Base 15 Housing supporting means 16 Clamp fixing member 17 Spindle shaft 18 Spindle bearing DESCRIPTION OF SYMBOLS 19 Coil 20 Magnet 21 Fixed shaft of head drive means 22 Fixed shaft bearing 23 Head support means spacer 24 Lid 25 Guide protrusion 26 Gimbal 27 Elastic support means 28 Elastic support means fixing member 29 Magnetic core 30 Fixed shaft 31 Hub 32 Fixing member

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takao Terayama 502 Kandate-cho, Tsuchiura-shi, Ibaraki Pref. Machinery Research Laboratory, Hitachi, Ltd. In-house (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 21/02

Claims (5)

(57) [Claims] 1. A disc for recording information, a rotating support means for the disc, and a disc driving means for rotating the disc, the disc being provided facing the surface of the disc. In a rotating disk type storage device comprising a head supporting means for supporting a head for reading and writing information and a head driving means for moving the head to any different radial position on the disk, the head driving means comprises a head A rotating disk storage device, wherein a flat coil serving as a driving force generating means is divided into two parts, arranged in a direction substantially at 180 degrees to a fixed axis, and supported by a coil supporting means. 2. A base for supporting said head driving means.
There, the housing and the housing base is integral - scan formed by elastic support to Claim 1 rotating disk storage device according. 3. A base for supporting the head driving means, housings and together form a housing base - formed by elastically supported within the scan flush claim 1 rotating disk storage device according. 4. A base for supporting said head driving means, housings and housing base is integral - with the scan flush claim 1 comprising a relatively movable resiliently supported
A rotating disk storage device according to any of the preceding claims. 5. The disk, and means for rotating the disk.
The disk drive means, the head support means,
The head driving means and the same base are mounted on the same base, and the base is
2. The rotating disk storage device according to claim 1, wherein the rotating disk storage device is elastically supported by the housing .