JPH08287625A - Actuator, fpc, bush tap and disk device using the same - Google Patents

Abstract

PURPOSE: To shorten the time required for positioning and to enhance positioning accuracy as well by constituting a head arm out of plural arm parts and reducing vibration of the actuator by making natural frequencies of the individual arm parts different from each other. CONSTITUTION: The head arm 26 for supporting a magnetic head 29 is provided on a shaft 25 to be tunable across tracks of a magnetic disk 23. On the head arm 26, two arm parts are formed via a hole 26a, and at least one dimension of one arm part out of its width, thickness and length is set to be different from that of the other arm part. By this method, even when the natural frequencies of the individual head parts are different from each other and one head arm part is resonated, the other head arm part is not resonated, so that vibration of the whole actuator 24 is reduced, and the time required for positioning is shortened, and moreover, the positioning accuracy is enhanced as well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a head arm which extends in the recording surface direction of a recording medium and supports a head for reading / writing data from the recording medium. The present invention relates to an actuator that drives in a direction traversing a track of a recording medium.

Further, there is provided a disk recording medium which is rotationally driven, a head for reading / writing data from / to the disk recording medium, and a head arm for supporting the head. The present invention relates to a disk device including an actuator that drives in a direction traversing a track.

Further, one end is on the side of the disk device main body,
The middle part is curved and the other end is connected to an actuator for driving a head for reading / writing data to / from a recording medium in a direction traversing a track of the recording medium, and for exchanging signals with the head. Regarding FPC.

Furthermore, the present invention relates to a bush tap used in the above disk device. In recent years, the capacity of disk devices has been increased, and along with this, there has been a demand for narrower track pitches of recording media. High-accuracy positioning accuracy is required in order to narrow the track pitch, and vibrations generated in the device are a major factor in alienating this high-accuracy positioning.

[0005]

2. Description of the Related Art Next, a conventional example will be described with reference to the drawings.
FIG. 14 is a plan view of a magnetic disk device which is a disk device using a conventional actuator.

In the figure, a spindle 2 which is rotationally driven by a spindle motor (not shown) is provided on a base 1 whose upper surface is open. A magnetic disk 3 as a recording medium is fixed to the cylindrical surface of the spindle 2.

Next, the actuator 4 will be described.
A shaft 5 is erected on the base 1, and the shaft 5
A head arm 6 is rotatably provided so as to cross a track of the magnetic disk 3.

Further, in order to reduce the weight, the head arm 6 is provided with a hole 6a at a substantially central portion in the width direction, and the first head arm portion 6b having substantially the same width is formed through the hole 6a (gap).
And a second head arm portion 6c are formed.

The head arm 6 has a coil 7 at one rotation end and a spring arm 8 at the other rotation end for reading / writing data from / to the magnetic disk 3. Is provided.

On one rotating end side of the head arm 6,
A magnetic circuit 10 is provided. The coil 7 of the actuator 4 is arranged in the magnetic gap of the magnetic circuit 10.

Reference numeral 11 is arranged in a loop shape on the base 1, one end of which is connected to a substrate provided on the side of the base 1 (the main body of the magnetic disk device) and the other end of which is connected to the actuator 4 and is magnetic. A signal is received by the head 9 and also acts as a damper for the actuator 4.
It is an FPC (Flexible Printed Circuit).

Reference numeral 1a is a screw hole for attaching a lid that covers the open base 1. Further, the magnetic disk device is provided with a bush tap for mounting the magnetic disk device on the system side.

Two types of bush taps 11 will be described with reference to FIGS. 15 (a) and 15 (b). FIG.
5 (a), 12 is a system provided with a through hole 12a. On the other hand, a through hole 1b facing the through hole 12a of the system 12 is also formed in the base 1 which is the mounted object.

Further, a cylindrical bush tap 13 having a flange portion 13a formed at the base end portion for preventing the stopper from coming off and an internal thread 13b being threaded on the inner cylindrical surface is provided from the inside of the apparatus to the base 1.
Through the through hole 1b of the system 12
The screw 14 for inserting a is the female screw 1 of the bush tap 13.
The device is attached to the system 12 by being screwed onto 3b.

On the other hand, in FIG. 15 (b), the bush tap 15 has a double structure. Reference numeral 16 is a cylindrical inner bushing tap having an outer cylinder diameter smaller than the diameter of the through hole 1a of the base 1, and a flange portion 16a is formed at the base end portion for preventing the stopper from coming off, and a female screw is formed on the inner cylinder surface. 16b is threaded. Reference numeral 17 is a cylindrical outer tabush tap whose outer cylinder diameter is set to be slightly smaller than the through hole 1b of the base 1 and whose inner cylinder diameter is set to be slightly larger than the outer cylinder diameter of the inner bush tap 16. This outer tab tap 1
The collar 7 is also formed at 7 to prevent the stopper from coming off.

The inner bush tap 16 is provided from the inside of the apparatus, and the outer bush tap 17 is provided from the outside of the apparatus.
Are respectively inserted into the through holes 1b of the base 1, and the screws 18 inserted through the through holes 12a on the system 12 side are screwed into the internal threads 16b of the inner bush taps 16 of the bush taps 15, whereby the device is installed in the system 12. Install it.

Next, the operation of the magnetic disk device having the above structure will be described. When the spindle motor (not shown) rotates (for example, 3600 rpm), the magnetic disk 3 also rotates. Then, when an electric current is applied to the coil 7 of the actuator 4, a thrust force for swinging the head arm 6 is generated in the coil 7 disposed in the magnetic gap of the magnetic circuit 10, and the magnetic head 9 is rotated. The disk 3 is moved across the tracks. Then, data reading / writing is performed on the magnetic disk 3 on a desired track.

[0018]

However, the magnetic disk device having the above structure has the following problems.

(1) Actuator 4 When the natural vibration frequency of the actuator 4 and the natural vibration frequency of the spindle motor 2 which is the magnetic disk drive system are close to each other, the actuator 4 resonates, and the actuator 4 causes the magnetic head 9 to move to the magnetic disk 9. After moving (seeking) to the target track of No. 3, the time until the vibration of the actuator 4 stabilizes becomes long, and the time required for positioning becomes long.

Further, when the rigidity of the actuator 4 is lowered, it is apt to vibrate and it is not possible to secure a high positioning accuracy. (2) FPC11 FPC11 that sends and receives signals to and from the magnetic head 9
Also swings and bends as the actuator 4 swings, but if the natural vibration frequency of the actuator 4 and the natural vibration frequency of the FPC 11 are close to each other, the actuator 4 will move to the FPC 11
There is a problem in that it takes time for the vibration of the actuator 4 to stabilize and the time required for positioning becomes long due to the influence of the vibration.

The present invention has been made in view of the above problems, and an object thereof is to shorten the time required for positioning, and
It is to provide an actuator, an FPC, and a disk device with high positioning accuracy.

[0022]

Means for Solving the Problems A first method for solving the above problems is described below.
The actuator of the invention of claim 1 has a head arm that extends in the direction of the recording surface of the recording medium and supports a head that reads / writes data from / to the recording medium. In an actuator that drives in a transverse direction, the head arm is composed of two or more arm portions arranged side by side with a gap, and at least one of the width, thickness, and length of each arm portion is the other. It is different from the arm part of.

A disk device according to a second aspect of the present invention has a disk recording medium that is rotationally driven, a head that reads / writes data from the disk recording medium, and a head arm that supports the head. In a disk device including an actuator that drives a head arm in a direction that traverses a track of the recording medium, the head arm of the actuator is composed of two or two or more arm portions arranged side by side with a gap, Arm width,
At least one of the thickness and the length is made different from other arm portions.

An actuator according to a third aspect of the present invention has a head arm that extends in a recording surface direction of a recording medium and supports a head that reads / writes data from / to the recording medium. An actuator for driving a recording medium in a direction traversing a track has a notch provided in the head arm.

A disk device according to a fourth aspect of the present invention has a disk recording medium that is rotationally driven, a head that reads / writes data from / to the disk recording medium, and a head arm that supports the head. In a disk device including an actuator that drives a head arm in a direction that traverses a track of the recording medium, a cutout is provided in the head arm of the actuator.

An actuator according to a fifth aspect of the present invention has a head arm that extends in the recording surface direction of a recording medium and supports a head that reads / writes data from / to the recording medium. In an actuator for driving a recording medium across a track, the head arm is composed of two or more arm portions arranged in parallel with a gap, and each arm portion is curved.

A disk device according to a sixth aspect of the present invention has a disk recording medium that is rotationally driven, a head that reads / writes data from / to the disk recording medium, and a head arm that supports the head. In a disk device including an actuator that drives a head arm in a direction that traverses a track of the recording medium, the head arm of the actuator is composed of two or two or more arm portions arranged side by side with a gap, The arm part is curved.

In the FPC of the seventh invention, one end of the FPC is curved toward the main body of the disk device, the other end thereof is curved, and the other end is a head for reading / writing data from / to the recording medium. An FPC that is connected to an actuator that drives in the transverse direction and sends and receives signals to and from the head.
In the above, the FPC is provided with a vibration damping section.

An example of the vibration damping unit is a member made of the same material as the base material of the FPC. Further, as another example of the vibration damping unit, a sponge material is preferable in that it absorbs vibrations, and the FP
It is desirable that C be restrained at a place other than the actuator.

Further, as another example of this vibration damping unit,
There is a part where the width of the FPC is different from other parts. Further, as another example of the vibration damping unit, it is also preferable that the vibration damping unit is an electronic component mounted on the FPC in order to save space.

A disk device according to an eighth aspect of the present invention is a disk device in which signals are transmitted and received to and from a head provided on an actuator through an FPC having one end connected to the actuator and the other end connected to the main body of the device. The FPC is provided with a vibration damping section.

A bush tap according to a ninth aspect of the present invention has a cylindrical portion loosely fitted in a through hole formed in a member to be mounted and a base end portion of the cylindrical portion, and has a diameter larger than that of the through hole of the member to be mounted. An inner cylindrical surface of the cylindrical portion, which has a large diameter and is composed of a proximal flange portion that can come into contact with one surface of the mounted member and a distal flange portion formed at the distal end of the cylindrical portion. A female thread is threaded on the cylindrical portion, and the cylindrical portion includes a large-diameter portion on the base end side and a small-diameter portion on the tip end side. A flexible tip portion is formed by at least two slits extending along and is made of a damping material.

According to a tenth aspect of the present invention, there is provided a disk device in which a cylindrical portion loosely fitted in a through hole formed in a mounted member and a diameter of the through hole formed in the mounted member are formed at a base end portion of the mounted member. An inner cylindrical surface of the cylindrical portion, which has a large diameter and is composed of a proximal flange portion that can come into contact with one surface of the mounted member and a distal flange portion formed at the distal end of the cylindrical portion. A female thread is threaded on the cylindrical portion, and the cylindrical portion includes a large-diameter portion on the base end side and a small-diameter portion on the tip end side. The tip flexible portion is formed by at least two or more slits extending along, and has a bush type made of a damping material.

[0034]

In the actuator of the first aspect of the invention and the disk device of the second aspect of the invention, the head arm is composed of two or more arm portions arranged side by side with a gap, and the width, thickness, and By making at least one of the lengths different from the other arm portions, the natural vibration frequencies of the respective arm portions differ. Therefore, even if one arm portion resonates, the other arm portion does not resonate, so that the vibration of the actuator as a whole is small, the time required for positioning is short, and the positioning accuracy is high.

In the actuator of the third aspect of the invention and the disk device of the fourth aspect of the invention, since the head arm is provided with the notch, the natural oscillation frequency of the present actuator is the natural oscillation frequency of the conventional actuator having no notch. Different from

Therefore, when the conventional actuator resonates due to the vibration of the spindle motor or the like, it does not resonate due to the provision of the notch, the time required for positioning is short, and the positioning accuracy is high.

In the actuator of the fifth aspect of the invention and the disk device of the sixth aspect of the invention, the head arm is composed of two or more arm portions arranged side by side with a gap, and each arm portion is curved. , The second moment of area of each arm increases, the rigidity increases, and the natural vibration frequency also increases.

Therefore, when the conventional actuator resonates due to the vibration of the spindle motor or the like, the actuator of the present invention does not resonate due to the increase in the natural vibration frequency of the head arm, and the time required for positioning is short, Further, the positioning accuracy is also high.

In the FPC of the seventh aspect of the invention and the disk device of the eighth aspect of the invention, by providing the damping portion, the natural vibration frequency of the FPC deviates from the natural vibration frequency of the conventional FPC, or the vibration is absorbed. As a result, the influence of FPC vibration on the actuator is reduced.

Therefore, the time required for positioning the actuator is short and the positioning accuracy is high. In the bush tap of the ninth invention and the disk device of the tenth invention, the cylindrical portion of the bush tap is loosely fitted in the hole of the mounted member, and the screw is screwed into the inner cylindrical portion of the cylindrical portion so that the screw is screwed into the screw. Then, the tip flexible portion moves in the radial direction, and the tip flange portion presses the other surface of the mounted member.

Since this bush tap is made of a damping material, the vibration between the bush tap and the mounted member is reduced, and the vibration acting on the actuator is reduced.
Therefore, the time required for positioning the actuator is short, and the positioning accuracy is high.

[0042]

Embodiments of the present invention will be described with reference to the drawings. 1 is a plan view of a disk device according to a first embodiment of the present invention, FIG. 2 is an enlarged view of an actuator in FIG. 1, and FIG.
Is an enlarged view of another embodiment of the actuator in FIG. 1,
FIG. 4 is a view on arrow A in FIG. In this embodiment, a magnetic disk device will be described as an example of the disk device.

In the figure, the base 21 having an open upper surface
A spindle 22 that is rotationally driven by a spindle motor (not shown) is provided on the top. Spindle 2
A magnetic disk 23 as a recording medium is fixed to the cylindrical surface of 2.

Next, the actuator 24 will be described. A shaft 25 is erected on the base 21, and a head arm 26 is attached to the magnetic disk 23 on the shaft 25.
It is rotatably provided so as to cross the truck.

A hole 26a is formed in the head arm 26 for the purpose of weight reduction, and the first head arm portion 26b and the second head arm portion 26c are provided through the hole 26a (gap).
And are formed.

Then, at least one of the width, thickness and length of each arm portion 26b, 26c is set to be different from the other arm portions. In the present embodiment, as shown in FIG. 2, the width (W1) of the first head arm portion 26b and the width (W2) of the second arm portion 26c are the width (W1) of the first head arm portion 26b. Is larger than the width (W2) of the second head arm portion 26c.

The head arm 26 has a coil 27 at one rotation end and a spring arm 28 at the other rotation end for reading / writing data from / to the magnetic disk 23. Is provided.

A magnetic circuit 30 is provided on one rotating end side of the head arm 26. The coil 27 of the actuator 24 is arranged in the magnetic gap of the magnetic circuit 30.

Reference numeral 31 is arranged on the base 1 so as to be curved in a loop shape, and one end thereof is the base 21 (magnetic disk device main body).
With an FPC (flexible printed circuit) that is connected to the substrate provided on the side and the other end is connected to the actuator 24, receives signals to the magnetic head 29, and also functions as a damper for the actuator 24. is there.

At the bent portion of this FPC 31, the A in FIG.
As shown in FIG. 4, which is a view from the direction of the arrow, a tape 32 that is a vibration damping portion is attached. The material of this tape 32 is FPC
It is the same material as the base material 31.

The base 21 is provided with a screw hole 21a for attaching a lid which covers the open upper surface. Further, the magnetic disk device is provided with a bush tap for mounting the magnetic disk device on the system side.

Here, the bush tap 33 will be described with reference to FIG.
Will be explained. This bush tap 33 is made of a material such as aluminum, rubber, or plastic, and has a base 2
Cylindrical portion 33a loosely fitted in the through hole 21a of No. 1 and the cylindrical portion 3
3a has a diameter larger than the diameter of the through hole 21a of the base 21 and is formed on the tip end of the cylindrical portion 33a and the base flange portion 33b that can abut on one surface of the base 21. The inner cylindrical surface of the cylindrical portion 33a is threaded with a female screw 33d.

The cylindrical portion 33a has a large diameter portion 33e on the base end side.
And a small diameter portion 33f having a diameter that gradually decreases toward the tip end side, and the small diameter portion 33f is formed by at least two or more slits 33g extending in the axial direction from the tip flange portion 33c. Flexible tip 33h
Are formed. The outer cylindrical portion of the cylindrical portion 33a is lined with rubber, which is a vibration damping material.

From the outside of the device, the bush tap 3
3 is inserted into the through hole 21a of the base 21 (FIG. 5 (a)),
As the screw 35 that passes through the through hole 40a on the system 40 side is screwed into the female screw 33d of the bush tap 33, the tip flexible portion 33f moves in the radial expansion direction, and the tip flange portion 33c becomes the base 21. And the system 40 and the magnetic disk device are attached.

Next, the operation of the magnetic disk device having the above structure will be described. When the spindle motor (not shown) rotates (for example, 3600 rpm), the magnetic disk 23 also rotates. Then, when a current is passed through the coil 27 of the actuator 24, a thrust force that causes the head arm 26 to swing is generated in the coil 27 arranged in the magnetic gap of the magnetic circuit 30, and the magnetic head 29 is rotated. Disk 2
Move across 3 tracks. Then, the data is read from the magnetic disk 23 on the desired track.
/ Write is performed.

According to the above structure, the following effects can be obtained. (1) Since the widths of the first head arm portion 26b and the second head arm portion 26c of the head arm 26 are different, the natural vibration frequencies of the head arm portions 26b and 26c are different. Therefore, even if one head arm portion resonates, the other head arm portion does not resonate, so that the overall vibration of the actuator 24 becomes small,
The time required for positioning is short, and the positioning accuracy is high.

(2) The tape 32 as a vibration damping unit on the FPC 31
By providing the, the rigidity of FPC31 is increased, and FPC31
The natural vibration frequency of is also higher than that of conventional FPC. Therefore, the actuator that resonated by the conventional FPC becomes difficult to resonate.

Therefore, the time required for positioning the actuator 24 is short, and the positioning accuracy is high. (3) Since the outer cylindrical portion of the bush tap 33 is lined with rubber which is a vibration damping material, vibration between the bush tap 33 and the base 21 is reduced, and vibration acting on the actuator is reduced.

Therefore, the time required for positioning the actuator 24 is short, and the positioning accuracy is high. The bush tap 33 also has the following effects. In the bush taps 13 and 15 shown in FIG. 15 for explaining a conventional bush tap, the bush taps 13 and 1 are
It is necessary to lock 5 to the base 1 by some means. However, if the inside of the base 1 has a bag structure,
It is difficult to lock the bush taps 13 and 15.

However, since the bush tap 33 of this embodiment is provided with the base end flange portion 33b, no other locking means is required. Further, by forming the bush tap 33 with a non-conductive material, it is possible to easily insulate the screw from the screw.

The present invention is not limited to the above embodiment. First of head arm 26 of actuator 24
In addition to changing the width, the second head arm portions 26b and 26c have lengths L1 and L2, respectively, as shown in FIG.
May be changed, or the thickness may be changed.

Further, although the tape 32 is provided on the FPC 31 as a vibration damping portion, it is not limited to this. Figure 6
As shown in, the width of the FPC 31 may be gradually changed, and this may be used as the vibration damping unit. With this configuration,
Compared to the FPC with a constant width, the natural vibration frequency shifts, making it difficult for the actuator that used to resonate.

Therefore, the time required for positioning the actuator 24 is short, and the positioning accuracy is high. Further, as shown in FIG. 7, the FPC 31 may be provided with an electronic component 41 such as a chip resistor, a capacitor and an IC as a vibration damping portion by means of surface mounting or the like. With this configuration,
Compared with the conventional FPC, the natural vibration frequency shifts and the actuator does not resonate easily.

Therefore, the time required for positioning the actuator 24 is short, and the positioning accuracy is high. Further, since the electronic component 41 is provided in the FPC 31, the space is saved, and the FPC 31 also functions as a damper of the actuator 24. However, by providing the electronic component 41,
The inertial mass is large, and the function as a damper is improved.

Further, as shown in FIG. 8, the FPC 31 may be provided with a sponge 42. With such a configuration, the vibration of the FPC 31 is absorbed, and the transmission of the vibration to the actuator 24 is reduced.

Therefore, the time required for positioning the actuator 24 is short, and the positioning accuracy is high. Furthermore, as shown in FIG. 9, the method of stopping the FPC 31 on the base 21 side may be attached via a sponge 42.
With such a configuration, the vibration of the FPC 31 is absorbed, and the transmission of the vibration to the actuator 24 is reduced.

Therefore, the time required for positioning the actuator 24 is short, and the positioning accuracy is high. Further, as shown in FIG. 10, the intermediate portion of the FPC 31 may be fixed to the base 21 side using a sponge 43.

Next, a second embodiment of the present invention will be described with reference to FIG. Note that the difference between this embodiment and the first embodiment is the head arm portion, and the other portions have the same configuration, so a description thereof will be omitted.

In the figure, 50 is a head arm.
A hole 50a is formed in the head arm 51 for weight reduction, and a first head arm portion 50b and a second head arm portion 50c are formed through the hole 50a (gap).

The first head arm portion 50b and the second head arm portion 50b
Notches 50d, 5 are provided on the side surface of the head arm portion 50c.
0e is formed. According to the above configuration, since the notches 50d and 50e are provided on the sides of the first head arm 50b and the second head arm portion 50c of the head arm 50, the natural vibration frequency of the actuator 24 of the present embodiment is cut. It differs from the natural vibration frequency of a conventional actuator that does not have a notch.

Therefore, when the conventional actuator resonates due to the vibration of the spindle motor or the like, it does not resonate due to the provision of the notch, the time required for positioning is short, and the positioning accuracy is high.

Next, a third embodiment of the present invention will be described with reference to FIG. Note that the difference between this embodiment and the first embodiment is the head arm portion, and the other portions have the same configuration, so a description thereof will be omitted.

In the figure, 51 is a head arm.
A hole 51a is opened in the head arm 51 for weight reduction, and a first head arm portion 51b and a second head arm portion 51c are formed through the hole 51a (gap).

The first head arm portion 51b and the second head arm portion 51b
The head arm portion 51c is curved so as to be convex outward. According to the above configuration, by bending the arms 51b and 51c, the second moment of area of the arms 51b and 51c increases, the rigidity increases, and the natural vibration frequency also increases.

Therefore, when the conventional actuator resonates due to the vibration of the spindle motor or the like, the actuator of the present invention does not resonate because the natural vibration frequency of the head arm increases, and the time required for positioning is short. Further, the positioning accuracy is also high.

The invention is not limited to the above embodiment. As shown in FIG. 13, the first and second head arm portions 51b and 51c may be curved inwardly convexly. Further, in each of the above-described embodiments, the head arm is described as two head arm portions, that is, the first and second head arm portions, but two holes are provided in the head arm, and the first to third head arms are provided. The head arm portion may be divided, and three or more holes may be provided to form four or more head arms.

In each of the above-described embodiments, the magnetic disk device is used as the disk device, but in addition, a compact disk (CD) device or a magneto-optical disk (M) is used.
O) It can be applied to devices.

[0078]

As described above, according to the actuator of the first aspect of the invention and the disk device of the second aspect of the invention, the head arm is composed of two or two or more arm portions arranged side by side with a gap, By making at least one of the width, thickness, and length of each arm different from the other arms, the natural vibration frequencies of the respective arms differ. Therefore, even if one arm portion resonates, the other arm portion does not resonate, so that the vibration of the actuator as a whole is small, the time required for positioning is short, and the positioning accuracy is high.

According to the actuator of the third aspect of the invention and the disk device of the fourth aspect of the invention, since the notch is provided in the head arm, the natural vibration frequency of the present actuator is the characteristic of the conventional actuator in which the notch is not provided. Different from vibration frequency.

Therefore, when the conventional actuator resonates due to the vibration of the spindle motor or the like, it does not resonate due to the provision of the notch, the time required for positioning is short, and the positioning accuracy is high.

According to the actuator of the fifth aspect of the invention and the disk device of the sixth aspect of the invention, the head arm is composed of two or more arm portions arranged side by side with a gap, and each arm portion is curved. As a result, the second moment of area of each arm increases, the rigidity increases, and the natural vibration frequency also increases.

Therefore, when the conventional actuator resonates due to the vibration of the spindle motor or the like, the actuator of the present invention does not resonate because the natural vibration frequency of the head arm increases, and the time required for positioning is short, Further, the positioning accuracy is also high.

According to the FPC of the seventh invention and the disk device of the eighth invention, by providing the damping section, the natural vibration frequency of the FPC deviates from the natural vibration frequency of the conventional FPC, or the vibration is absorbed. As a result, the influence of FPC vibration on the actuator is reduced.

Therefore, the time required for positioning the actuator is short, and the positioning accuracy is high. According to the bush tap of the ninth invention and the disk device of the tenth invention, the cylindrical portion of the bush tap is loosely fitted in the hole of the mounted member, and the screw is screwed into the inner cylindrical portion of the cylindrical portion to form a screw. When they are screwed together, the flexible tip portion moves in the radial direction, and the brim portion of the tip portion presses the other surface of the mounted member.

Since this bush tap is made of the vibration damping material, the vibration between the bush tap and the mounted member is reduced, and the vibration acting on the actuator is reduced.
Therefore, the time required for positioning the actuator is short, and the positioning accuracy is high.

[Brief description of drawings]

FIG. 1 is a plan view of a disk device according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of the actuator in FIG.

FIG. 3 is an enlarged view of another embodiment of the actuator in FIG.

FIG. 4 is a view on arrow A in FIG.

FIG. 5 is a diagram illustrating a bush tap.

6 is an explanatory diagram of another embodiment of the FPC in FIG.

FIG. 7 is an explanatory diagram of another embodiment of the FPC in FIG.

FIG. 8 is an explanatory diagram of another embodiment of the FPC in FIG.

9 is an explanatory diagram of another embodiment of the FPC in FIG.

10 is an explanatory diagram of another embodiment of the FPC in FIG.

FIG. 11 is a configuration diagram of a main part for explaining a second embodiment of the present invention.

FIG. 12 is a configuration diagram of main parts for explaining a third embodiment of the present invention.

FIG. 13 is a diagram for explaining another embodiment in FIG.

FIG. 14 is a plan view of a magnetic disk device which is a disk device using a conventional actuator.

FIG. 15 is a cross-sectional view of a conventional bush tap.

[Explanation of symbols]

 21 Base 23 Magnetic Disk 24 Actuator 26 Head Arm 26a Hole (Gap) 26b First Head Arm 26c Second Head Arm 31 FPC 33 Bush Tap

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroshi Suzuki Hiroshi Suzuki, Higashine City, Yamagata Prefecture 5400, Omori, Higashinemoto, Higashine, Higashine (no address) Yamagata Fujitsu Limited (72) Tsutomu Sasaki, Kanagawa, Kawasaki, Kanagawa 1015 Otanaka in Fujitsu Limited (72) Inventor Takahiro Ono Higashine City, Yamagata Prefecture Higashi Nemoto Higashi Neji 5400 Omori Higashi Neji (No address) Fujitsu Limited in Yamagata Ltd. (72) Toshiyuki Hachiya Higashi Nemoto, Higashi City, Yamagata Prefecture 5400-2 Omori, Higashine (no address) In Fujitsu Limited, Yamagata (72) Inventor ▲ Sai ▼ Katsu Masaru, 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited

Claims (15)

[Claims] 1. A head arm which extends in a recording surface direction of a recording medium and supports a head for reading / writing data from / to the recording medium, wherein the head arm portion traverses a track of the recording medium. 2 or 2 in which the head arms are arranged side by side with a gap in between
An actuator comprising the above arm portions, wherein at least one of the width, thickness and length of each arm portion is different from other arm portions. 2. A disk recording medium that is rotationally driven, a head that reads / writes data from / to the disk recording medium, and a head arm that supports the head. In a disk device including an actuator that drives in a direction that traverses a track, the head arm of the actuator is configured by two or two or more arm portions arranged in parallel with a gap, and the width and thickness of each arm portion are A disk device, wherein at least one of the lengths is different from other arm portions. 3. A head arm, which extends in the recording surface direction of the recording medium and supports a head for reading / writing data from / to the recording medium, wherein the head arm section traverses a track of the recording medium. A directionally driven actuator, wherein the head arm is provided with a notch. 4. A disk recording medium that is rotationally driven, a head that reads / writes data from / to the disk recording medium, and a head arm that supports the head. A disk device comprising an actuator that drives in a direction traversing a track, wherein the head arm of the actuator is provided with a notch. 5. A head arm extending in the recording surface direction of a recording medium and supporting a head for reading / writing data from / to the recording medium, wherein the head arm section traverses a track of the recording medium. 2 or 2 in which the head arms are arranged side by side with a gap in between
An actuator comprising the above arm portions, wherein each of the arm portions is curved. 6. A disk recording medium that is rotationally driven, a head that reads / writes data from / to the disk recording medium, and a head arm that supports the head. In a disk device including an actuator that drives in a direction traversing a track, the head arm of the actuator is composed of two or more arm portions arranged in parallel with a gap, and each of the arm portions is curved. Disk device characterized by. 7. An end portion is curved toward the disk device body, an intermediate portion is curved, and the other end portion is for reading / writing data to / from a recording medium.
An FPC that is connected to an actuator that drives a write head in a direction that traverses a track of the recording medium, and that transmits / receives a signal to / from the head, wherein a vibration damping unit is provided in the FPC. 8. The FPC according to claim 7, wherein the damping portion is a member made of the same material as the base material of the FPC. 9. The FPC according to claim 7, wherein the vibration damping portion is a sponge material. 10. The FPC through the sponge material
10. The FPC according to claim 7, wherein the FPC is constrained to a position other than the actuator. 11. The FPC according to claim 7, wherein the vibration damping portion is a portion in which the width of the FPC is different from other portions. 12. The FP according to claim 7, wherein the vibration damping member is an electronic component mounted on the FPC.
C. 13. A disk device for transmitting / receiving a signal to / from a head provided on an actuator via an FPC having one end connected to the actuator and the other end connected to a device body side, wherein a damping part is provided on the FPC. A disk device provided. 14. A cylindrical portion loosely fitted in a through hole formed in a mounted member, and a diameter formed at a base end portion of the cylindrical portion, the diameter being larger than a diameter of the through hole of the mounted member, It is composed of a proximal flange part that can be in contact with one surface of the mounted member and a distal flange part formed at the distal end of the cylindrical part, and an internal thread is screwed on the inner cylindrical surface of the cylindrical part. The cylindrical portion is composed of a large-diameter portion on the base end side and a small-diameter portion on the tip end side, and the small-diameter portion of the cylindrical portion extends at least from the distal collar portion along the axial direction. A bush tap, characterized in that a flexible tip is formed by two or more slits and is made of a vibration damping material. 15. A cylindrical portion loosely fitted in a through hole formed in a mounted member, and a diameter formed at a base end portion of the cylindrical portion, the diameter being larger than a diameter of the through hole of the mounted member, It is composed of a proximal flange part that can be in contact with one surface of the mounted member and a distal flange part formed at the distal end of the cylindrical part, and an internal thread is screwed on the inner cylindrical surface of the cylindrical part. The cylindrical portion is composed of a large-diameter portion on the base end side and a small-diameter portion on the tip end side, and the small-diameter portion of the cylindrical portion extends at least from the distal collar portion along the axial direction. A disk device, wherein a flexible tip portion formed by two or more slits is formed, and a bush tap made of a damping material is provided.