JPH08263946A - Turning type actuator and rotary disk type recording and reproducing device - Google Patents

Abstract

PURPOSE: To contrive high recording densification and high capacity by suppressing vibration of the actuator for moving a head. CONSTITUTION: A suspension 12 of the turning type actuator 11 for moving the head 74 is provided with an engagement part 15 for engaging with a ramp 82 as a withdrawing means. A reinforcing part 16 made of resin is provided in a prescribed range of a suspension 12 including the engagement part 15. Since the reinforcing part 16 is light in weight, if the weight is the same as that formed of stainless steel, etc., the wall thickness can be increased. Consequently, the rigidity of the tip of the suspension 12 is enhanced to suppress vibration, and hence the head 74 can be accurately disposed in a prescribed position on a disk 72. Thus, high recording desification and high capacity of the disk 72 become feasible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary actuator and a rotary disk type recording / reproducing apparatus suitable for application to, for example, a hard disk device. More specifically, by providing a resin-made reinforcing means to the suspension for urging the head of the rotary actuator, the rigidity of the suspension was increased and the abrasion due to sliding with the ramp as the retracting means was prevented. The present invention relates to a rotary actuator and a rotary disk type recording / reproducing device.

[0002]

2. Description of the Related Art FIG. 13 shows a rotary disk type recording / reproducing apparatus.
There is a CSS (Contact Start Stop) type hard disk device 5 as shown in FIG. This hard disk device 5
Is a chassis 51 for holding the entire apparatus, a spindle motor 53 for rotationally driving a disk 52 which is a rotary disk type recording medium, and a rotary shaft 5 of the spindle motor 53.
A head 54 for recording or reproducing information and a rotary actuator 55 for rotating the head 54 are provided on the disk 52 mounted on the disk 3A.

A slider 56 for smoothly moving the head 54 relative to the disk 52 is provided at the tip of the rotary actuator 55. Slider 56
Is a type that slides on the disc 52,
There is a type that floats by receiving the air that moves with the rotation of. The rotary actuator 55 includes a slider 56.
The suspension 57, which is an urging means for urging the disk to the disk 52 side with a predetermined urging force, and the rotary actuator 55, which has a predetermined length and is a holding means for rotatably holding the rotary actuator 55. An arm 58 is provided.

The arm 58 is attached to a rotary shaft 59 provided upright on the chassis 51, and a coil 60 is provided at the tip end opposite to the suspension 57. Further, the chassis 51 is provided with a magnet 61 corresponding to the coil 60, and the magnetic field generated by flowing a predetermined current through the coil 60 and the magnetic field of the magnet 61 act to cause the rotary actuator 55 to move in a predetermined direction. It is designed to rotate.
When recording or reproducing a signal, the rotary actuator 55
Rotates and the head 54 is placed on a predetermined track of the disk 52.

The hard disk device 5 is a disk 5
Since the slider 56 is in contact with the disk 52 during the second stop, it is called the CSS method. In the CSS method, the slider 56 is arranged in contact with the innermost side of the disk 52 when the disk 52 is stopped, and when the disk 52 starts rotating, the spindle motor 53 rotates in this state.

On the other hand, as shown in FIG. 14, in the ramp loading type hard disk drive 7, the slider 7 of the rotary actuator 75 is operated while the disk 72 is stopped.
6 is retracted from the disk 72 to another position. This hard disk device 7 includes a chassis 71
A spindle motor 73 is provided on the top of the rotary shaft 73.
A disk 72 is mounted on A. The rotary actuator 75 is provided with a head 74, a slider 76, a suspension 77, an arm 78, and a coil 80.
The rotary actuator 75 is attached to a rotary shaft 79 provided upright on the chassis 71. A magnet 81 is arranged below the coil 80.

Further, the hard disk device 7 is provided with a lamp 82 as a retracting means for the rotary actuator 75 on the chassis 71. The ramp 82 is provided with a sliding surface 83 that is inclined downward toward the disk 72 side. A hemispherical dimple 84 that slides on the sliding surface 83 is provided at the tip of the suspension 77 of the rotary actuator 75.

In the hard disk device 7, the rotary actuator 75 pivots clockwise in the drawing immediately before the disk 72 stops, and the dimple 84 of the suspension 77 moves upward along the sliding surface 83 of the ramp 82. . As a result, the slider 76 and the head 74 retract from the disk 72. This operation is called unload. While the disk 72 is stopped, the dimples 84 are held in a state of being engaged with the sliding surface 83.

At the start of rotation of the disc 72, after the disc 72 reaches a predetermined number of revolutions, the rotary actuator 75 turns counterclockwise, and the dimples 84 of the suspension 77 follow the sliding surface 83 of the ramp 82. And descend. As a result, the slider 76 and the head 74 move from the retracted position onto the disk 72, and the suspension 77
Is urged toward the disk 72 side. The operation of moving the slider 76 away from the ramp 82 and onto the disk 72 is called loading. A method of performing such a loading operation is called a lamp loading method. After the loading operation of the rotary actuator 75, the operation is similar to that of the hard disk device 5 described above.

In this ramp-loading type hard disk device 7, since the slider 76 does not exist on the disk 72 while the disk 72 is stopped, even if a shock is applied to the chassis 71 or the like, the slider 72 and the head 74 collide with the disk 72. It does not get scratched and has excellent impact resistance. Further, since the slider 76 is located outside the disk 72 while the disk 72 is stopped,
There is an advantage that the sticking phenomenon (stiction) in which the slider 76 sticks to the sheet does not occur.

Now, the rotary actuator 75 in the above-mentioned lamp loading type hard disk device 7 is used.
For this, a suspension 77 as shown in FIG. 15 is used. The main body 85 of the suspension 77 is formed of a long leaf spring material such as stainless steel,
Since the slider 76 is biased toward the disk 72 by a predetermined biasing force, it has a predetermined elasticity. At the tip of the main body 85,
For example, a step-like engaging portion 86 formed of stainless steel or the like
Is fixed, and the slider 76 is fixed to the lower side thereof so as to be displaceable. The dimple 84 described above is integrally formed at the tip of the engaging portion 86.

In this suspension 77, as shown in FIG.
As shown in FIG. 6, since the engaging portion 86 is formed of a plate material, bending work is easy, and the disc 72 and the dimple 8 are formed.
It is easy to change the interval a of 4. Therefore, the degree of freedom in designing the shape and dimensions of the lamp 82 is increased.

A suspension 87 shown in FIG.
The main body 88 is integrally provided with an engaging portion 89.
The engagement portion 89 is formed by bending the tip of the main body 88 in a stepwise manner. The slider 76 has an engaging portion 89.
It is installed just before. The engaging portion 89 is provided with a hemispherical dimple 90 facing downward. This suspension 87 can reduce the number of parts as compared with the suspension 77 shown in FIG. Furthermore, FIG.
In the suspension 91 shown in FIG. 8, a rod-shaped engaging portion 93 is separately provided on the side of the main body 92. The engaging portion 93 is
It is fixed by caulking the main body 92.

[0014]

By the way, the engaging portions 86, 8 of the suspensions 77, 87, 91 as described above.
Since 9, 93 are arranged at the positions farthest from the center of rotation of the rotary actuator 75, it is desirable to reduce the weight as much as possible from the viewpoint of enabling high-speed follow-up by reducing inertia. On the other hand, the engaging portions 86, 89, 9
3 is preferably as rigid as possible from the viewpoint of reducing vibration.

However, the suspensions 77 and 87 shown in FIGS. 15 and 17 have low rigidity because the engaging portions 86 and 89 are plate-shaped, and have a very large peak characteristic in bending mode and torsion mode. There was a problem of having vibration. FIG. 19 shows the suspension 87 shown in FIG.
The I-θ characteristic of the rotary actuator 75 using is shown. The I-θ characteristic represents a transfer function (displacement / force = compliance) of the rotary actuator 75 in the sway direction (turning direction), and is used as a general evaluation method of the actuator. Here, the vibration of the rotary actuator 75 is transmitted to the slider 76. Among the vibrations transmitted, the vibration in the sway direction is transmitted to the head 7.
Since it makes positioning of No. 4 difficult, this is to be evaluated especially by the I-θ characteristic.

In the I-θ characteristic of FIG. 19, the horizontal axis represents the vibration frequency and the vertical axis represents the displacement / force in the head 74. As shown in the figure, the rotation type actuator 75 using the suspension 87 has 4.7 KHz and 10 KHz.
It can be seen that there is a large peak natural vibration at a frequency of Hz. The peaks correspond to the primary bending mode and the primary twisting mode of the engaging portion 89, respectively. As described above, the conventional rotary actuator 75 using the plate-shaped engaging portions 86 and 89 has a problem that the I-θ characteristic is deteriorated because the rigidity is low, that is, vibration easily occurs. When the vibration occurs, it becomes difficult to dispose the head 74 at a predetermined position on the disk 72 (FIG. 14), and thus it becomes difficult to realize high recording density and high capacity of the disk 72. there were.

When the rod-shaped engaging portion 93 shown in FIG. 18 is used, when the slider 76 is thin as shown in FIG. 20, the distance d between the disk 72 and the engaging portion 93 becomes small. There has been a problem that the shape and size of the lamp 82 which becomes narrower and enters the space d are complicated to set and process.

Therefore, the present invention has solved the above-mentioned problems, and it is possible to suppress vibration and to increase the degree of freedom in designing a lamp. A recording / reproducing apparatus is proposed.

[0019]

In order to solve the above-mentioned problems, in the rotary actuator according to claim 1,
A head for recording or reproducing information on or from a rotating disk type recording medium, an actuator body for rotating the head to a predetermined position on the rotating disk type recording medium, and an actuator while the rotating disk type recording medium is stopped. In a rotary actuator of a rotary disk type recording / reproducing apparatus having a retracting means for retracting the main body, a reinforcing means formed of resin in a predetermined range including an engaging portion of an actuator main body engaging with the retracting means. Is provided.

According to another aspect of the present invention, there is provided a rotating disk type recording / reproducing apparatus, wherein a head for recording / reproducing information on / from a rotating disk type recording medium and a head is rotated to move to a predetermined position of the rotating disk type recording medium. In a rotary disk type recording / reproducing apparatus using a rotary actuator having an actuator body for causing the rotary disk type recording medium to be retracted while the rotary disk type recording medium is stopped, an actuator engaging with the retracting means The reinforcing means formed of resin is provided in a predetermined range including the engaging portion of the main body.

[0021]

In the present invention, since the reinforcing means formed of resin is provided in a predetermined range including the engaging portion that engages with the retracting means of the actuator body, the rigidity of the tip of the actuator body is increased. It is possible to suppress the occurrence of vibration. Further, since the reinforcing means is formed of a lightweight resin, it is possible to prevent an increase in weight and reduce inertia. The position of the reinforcing means is arbitrary, which allows the shape and size of the retracting means to be freely designed.

[0022]

Next, an embodiment in which the rotary actuator and the rotary disk type recording / reproducing apparatus according to the present invention are applied to a hard disk device will be described in detail with reference to the drawings. The same parts as those described above are designated by the same reference numerals and detailed description thereof is omitted.

FIG. 1 shows the configuration of a hard disk device 1 to which the present invention is applied. This hard disk device 1 is of a lamp loading type, and a spindle motor 73 is provided on a chassis 71, and a disk 72 is mounted on its rotation shaft 73A. The rotary actuator 11 is arranged on the side of the spindle motor 73, and the rotary actuator 11 is attached to the rotary shaft 79 of the chassis 71. The rotary actuator 11 is provided with a head 74, a slider 76, a suspension 12, an arm 78, and a coil 80. A magnet 81 is arranged below the coil 80.

Further, the hard disk device 1 is provided with a lamp 82 as a retracting means for the rotary actuator 11 on the chassis 71. The ramp 82 is provided with a sliding surface 83 that is inclined downward toward the disk 72 side. A hemispherical dimple 13 that engages with the ramp 82 is provided at the tip of the suspension 12 of the rotary actuator 11. This hard disk device 1
Since the operation of is similar to the operation of the conventional hard disk device 5 described in FIG. 14, the description is omitted here.

As shown in FIG. 2, the main body 14 of the suspension 12 of the rotary actuator 11 is made of a plate-like spring material such as stainless steel, and is elongated.
The slider 76 is biased toward the disk 72 with a predetermined biasing force. The tip of the main body 14 has a relatively narrow width and is bent stepwise to provide the engaging portion 15.
As shown in FIG. 3, the dimple 1 is attached to the tip of the engaging portion 15.
3 is provided. The dimple 13 has a downward hemispherical shape. Immediately before the engaging portion 15, a slider 76 is fixed so as to be displaceable. The slider 76 has
A head 74 is provided.

The suspension 12 has a reinforcing portion 16 for increasing the rigidity of the tip of the main body 14 and the engaging portion 15.
Is provided. The reinforcing portion 16 is made of a material that is lightweight and has high strength such as resin, and is formed in a relatively thick and long plate shape. The reinforcing portion 16 is fixed to the upper surface side from the tip portion of the main body 14 to the engaging portion 15. The upper surface side of the reinforcing portion 16 is flat and the lower surface side is the main body 1
4 and the upper surface of the engaging portion 15 are formed. A part of the reinforcing portion 16 is also inserted in the dimple 13.

Here, since the tip end of the suspension 12 and the engaging portion 15 are reinforced by the relatively thick plate-shaped reinforcing portion 16, the rigidity in the bending direction and the twisting direction becomes particularly high. FIG. 4 shows the I-θ characteristic of the rotary actuator 11 to which the suspension 12 is applied. In the figure, the horizontal axis indicates the vibration frequency, and the vertical axis indicates the displacement of the head 74 /
Show power. As can be seen from the figure, the peak of natural vibration in the bending mode occurs at 5.1 KHz, and the peak of natural vibration in the twisting mode occurs at 12 KHz. This is because the peak frequencies of 4.7 KHz and 10 in the I-θ characteristic (FIG. 19) when the conventional reinforcing portion 16 is not provided.
For KHz, 0.4KHz and 2K respectively on the high frequency side
It is off by Hz. Also, the peak gain is 13
It is 16 dB lower than that of dB.

FIG. 5 shows the suspension 17 of the second embodiment.
Shows the configuration of. In this suspension 17, a plate-shaped reinforcing portion 19 made of resin is fixed to the tip of a main body 18. As shown in FIG. 6, the lower surface side of the tip of the reinforcing portion 19 is formed stepwise, and the engaging portion 20 for riding on the sliding portion 83 of the ramp 82 is provided. The slider 76 is movably fixed to the lower side of the tip of the main body 18. The reinforcing portion 19 can be formed of, for example, PEEK (polyether / ether / ketone). In this case, if the same weight and width as in the case of the conventional stainless steel are used, the thickness can be made thicker than in the conventional case, so that the bending strength can be doubled. Further, glass fiber can be compounded in the resin that is the material of the reinforcing portion 19, and in this case, the rigidity can be increased to about three times that of stainless steel.

FIG. 7 shows the suspension 21 of the third embodiment.
Shows the configuration of. This suspension 21 is provided with a main body 18 similar to the suspension 17 shown in FIG. 5, and a reinforcing portion 22 is provided at the tip thereof. The engaging portion 20 is provided at the tip of the reinforcing portion 22. However, as shown in FIG. 8, in this suspension 21, a sliding round bar 23 is fixed to the lower surface side of the reinforcing portion 22. Round bar for sliding 23
Is to slide on the sliding surface 83 of the lamp 82. By forming the sliding surface 83 of the lamp 82 from a material having a low coefficient of friction, for example, ceramic, metal or hard resin, friction with the sliding surface 83 is reduced. be able to. As a result, the rotational driving force of the rotary actuator 11 can be reduced.

Further, as shown in FIG. 9, a sliding rod 23 is provided.
The protrusion length L from the reinforcing portion 22 and the fixing position can be freely set. Therefore, the distance e between the disk 72 and the sliding rod 23 can be set freely, and the shape and dimensions of the ramp 82 can be freely designed.

FIG. 10 shows the suspension 2 of the fourth embodiment.
4 shows the configuration of No. 4. This suspension 24 is provided with a sliding sphere 25 in place of the sliding rod 23 of the suspension 21 shown in FIG. 7. The sliding sphere 25 is
It is fixed to the engaging portion 20. This sliding sphere 25 also
Like the sliding rod 23, it is made of a material having a low coefficient of friction, and the friction with the sliding surface 83 of the ramp 82 is reduced, so that the rotational driving force of the rotary actuator 11 is also reduced. Furthermore, the sliding sphere 25 can be hollow, and in this case, the inertia at the tip of the rotary actuator 11 can be further reduced, so that the occurrence of vibration can be suppressed.

Incidentally, it is generally known that sliding the same kind of material increases the coefficient of friction. Therefore, in the first to fourth embodiments, the sliding of the lamp 82 is performed. Material of surface 83 and suspension 1 that slides with it
2, 17, 21, 24 dimples 13, an engaging portion 20,
By changing the materials of the sliding rod 23 and the sliding sphere 25, the friction coefficient is prevented from increasing.

For example, in the suspension 12 of the first embodiment shown in FIG. 2, the sliding surface 83 is made of resin and the dimple 1
3 can be stainless steel. In the suspension 17 of the second embodiment shown in FIG. 5, the sliding surface 83 is made of resin, and the engaging portion 20, and thus the reinforcing portion 19, is used as the sliding surface 83.
A resin having a friction coefficient different from that of can be used. In this case, both are made of resin but have different friction coefficients, so that sliding them does not increase the friction coefficient. The suspension 21 of the third embodiment shown in FIG.
3 and the sliding surface 83 may be made of resins having different friction coefficients. Also, in the suspension 24 of the fourth embodiment of FIG. 10, the sliding sphere 25 and the sliding surface 83 can be made of resins having different friction coefficients.

As described above, this hard disk device 1
Is a suspension 12 of the rotary actuator 11,
Since the predetermined range including the engaging portions 15, 20 of 17, 21, 24 is reinforced by the reinforcing portions 16, 19, 22 made of resin, the rigidity can be increased and the vibration can be suppressed. become. As a result, the head 24 can be accurately placed at a predetermined position, so that the disk 72
It is possible to increase the recording density and capacity of the device. Further, since the reinforcing portions 16, 19 and 22 are formed of a lightweight resin, it is possible to reduce inertia at the tip and prevent the high-speed followability from being impaired. Since the positions of the reinforcing portions 16, 19 and 22 can be arbitrarily set, the degree of freedom in designing the lamp 82 is increased.

The present invention can also be applied to a removable hard disk device 3 as shown in FIG. In the hard disk device 3, a spindle motor 33 is attached to a chassis 32 inside a housing 31, and a chucking magnet 34 for fixing the disk is provided on a rotation shaft 33A of the spindle motor 33. The chassis 31 is provided with a rotary actuator 35, a driving magnet 36 for the rotary actuator 35, and a lamp 37. The suspension 12 shown in FIG. 2, for example, is used for the rotary actuator 35.

On the other hand, in this hard disk device 3, a disk cartridge 38 is used. In the disc cartridge 38, a disc 40 is rotatably accommodated in a cartridge body 39 (a state in which the upper cover is removed is shown in the figure). The disk cartridge 38 is a case 3
The disc 40 is fixed to the rotary shaft 33A of the spindle motor 33 by the chucking magnet 34 when the disc cartridge 38 is inserted into the housing 31 to the end. . The operation of the hard disk device 3 is the same as that of the hard disk device 1 described above, and a detailed description thereof is omitted here.

Also in the hard disk device 3, vibration of the rotary actuator 35 is suppressed as in the hard disk device 1 described above, and the recording density and the capacity of the disk 40 can be increased. Further, it is possible to prevent the high-speed followability of the head 74 from being impaired. Also, the degree of freedom in designing the lamp 37 is increased. The rotary actuator 35
In place of the suspension 12, the above-mentioned suspensions 17, 21, and 24 can be applied.

[0038]

As described above, the rotary actuator and the rotary disk type recording / reproducing apparatus of the present invention have a predetermined range including the engaging portion with the retracting means of the actuator body.
A reinforcing means formed of resin is provided.

Therefore, according to the present invention, since the rigidity of the tip of the rotary actuator can be increased, it is possible to suppress vibration and dispose the head at a predetermined position on the recording medium. As a result, it is possible to increase the recording density and capacity of the recording medium. Further, since the reinforcing means is formed of a lightweight resin, it is possible to suppress an increase in the weight of the tip of the rotary actuator and prevent the high-speed followability of the head from being impaired. Further, since the shape of the engaging portion can be arbitrarily set, there is an effect that the degree of freedom in designing the retracting means is increased.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a hard disk device 1 to which a rotary actuator and a rotary disk type recording / reproducing device according to the present invention are applied.

FIG. 2 is a configuration diagram of a suspension 12 of the first embodiment.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a rotary actuator 11 using a reinforcing portion 16.
3 is a characteristic diagram showing the I-θ characteristic of FIG.

FIG. 5 is a configuration diagram of a suspension 17 of a second embodiment.

6 is a sectional view taken along line BB of FIG.

FIG. 7 is a configuration diagram of a suspension 21 of a third embodiment.

FIG. 8 is a sectional view taken along line CC of FIG.

FIG. 9 is a diagram showing an example of arrangement of sliding rods 23.

FIG. 10 is a configuration diagram of a suspension 24 of a fourth embodiment.

11 is a cross-sectional view taken along the line DD of FIG.

FIG. 12 is a configuration diagram of a hard disk device 3 of another embodiment.

FIG. 13 is a general CSS hard disk device 5.
FIG.

FIG. 14 is a configuration diagram of a general lamp loading type hard disk device 7.

FIG. 15 is a diagram showing a first conventional suspension 77.

16 is a sectional view taken along line XX of FIG.

FIG. 17 is a diagram showing a second conventional suspension 87.

FIG. 18 is a diagram showing a suspension 91 of a third conventional example.

FIG. 19 is a characteristic diagram showing I-θ characteristics of a rotary actuator 75 using a conventional plate-shaped engaging portion 89.

20 is a cross-sectional view taken along line YY of FIG.

[Explanation of symbols]

 1,3 Hard disk device 11,35 Rotation type actuator 12,17,21,24 Suspension 15,20 Engagement part 16,19,22 Reinforcing part 23 Sliding round bar 25 Sliding sphere 40,72 Disk 82 Lamp 83 Sliding Surface

Claims (6)

[Claims] 1. A head for recording / reproducing information on / from a rotating disk type recording medium, an actuator body for rotating the head to move it to a predetermined position on the rotating disk type recording medium, and the rotating disk. In a rotary actuator of a rotary disk type recording / reproducing apparatus having a retracting means for retracting the actuator body while the mold recording medium is stopped, a predetermined part including an engaging portion of the actuator body engaging with the retracting means. A rotary actuator characterized in that a reinforcing means formed of resin is provided in the range. 2. The rotary actuator according to claim 1, wherein the reinforcing means is rod-shaped. 3. The rotary actuator according to claim 1, wherein the engaging portion is a sphere provided on the reinforcing means. 4. A head for recording or reproducing information on or from a rotating disk type recording medium, an actuator body for rotating the head to move it to a predetermined position on the rotating disk type recording medium, and the rotating disk. In a rotary disk type recording / reproducing apparatus using a rotary actuator having a retracting means for retracting the actuator body while the mold recording medium is stopped, an engaging portion of the actuator body engaging with the retracting means is provided. A rotating disk type recording / reproducing device characterized in that a reinforcing means formed of resin is provided in a predetermined range including the same. 5. The rotating disk storage device according to claim 4, wherein the reinforcing means is rod-shaped. 6. The rotary disk type recording / reproducing apparatus according to claim 4, wherein the engaging portion is a sphere provided on the reinforcing means.