JPH08195040A - Actuator of disk device and joining method - Google Patents

Abstract

PURPOSE: To obviate the occurrence of 'play' between a resin arm part and a supporting arm part. CONSTITUTION: A fixing member between the stationary arm 5 and the supporting arm 3 have first and second fixing members 20a, 30a respectively having cylindrical parts 21a, 31a, 21b, 31b arranged in the through-holes of the fixing arm and collar parts 23a, 33a, 23b, 33b at their one-side ends. The side face in the cylindrical part of the first fixing member is so formed as to press the inside wall of the through-hole of the fixing arm and the side face in the cylindrical part of the second fixing member is so formed as to press the inside surface of the cylindrical part of the first fixing member. The side face in the cylindrical part of the second fixing member otherwise comes into contact with the inside wall of the through-hole of the fixing arm and the cylindrical part of the second fixing member comes into contact with the inside surface of the cylindrical part of the first fixing member. In addition, its end may be bent outward on the collar part of the first fixing member. The first and second fixing members and the inside wall of the through-holes of the fixing arm may be deformed by pressing the cylindrical part of the second fixing member from the inner side. The respective collar parts fix the supporting arm and the fixing arm toward the direction of the mutual contact surfaces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing type actuator used in a fixed magnetic disk device or the like for driving a magnetic head along an arcuate track, and a joining method for members applied to such an actuator. .

[0002]

2. Description of the Related Art FIGS. 1A and 1B are a plan view and a side view of such an actuator. As shown in the figure, this actuator has a support arm 3 for supporting the magnetic head 1 at one end and a fixed arm 5 to which the other end of the support arm 3 is fixed, and is rotatably attached to a disk device. Is fixed to the arm portion 7 and the arm portion 7 and is arranged in the magnetic circuit of the disk device,
A movable coil 9 that applies a rotational force to the arm portion 7 in response to energization and a fixing member 11 that fixes the support arm 3 to the fixed arm 5 through the respective through holes are provided. The fixed arm 5 is made of, for example, aluminum, and the support arm 3 is made of, for example, stainless steel.

As shown in FIG. 12 (a), the fixing member 11 has a cylindrical portion 13 inserted into the through holes of the support arm 3 and the fixing arm 5 and a flange portion 15 provided at one end thereof. Then, as shown in FIG.
12 is bent outward, or the inner wall of the cylindrical portion 13 is pressed toward the inner wall of the through hole of the fixed arm 5 in the direction indicated by the arrow as shown in FIG. 3 is fixed to the fixed arm 5. The collar portion 15 fixes the support arm 3 toward the fixed arm 5.

[0004]

However, according to such a conventional actuator, when the fixed arm 5 is made of resin in order to reduce the weight, the local force given by the bending or pressing is applied. Due to the creep phenomenon of the resin in the portion which is distorted by the force, the holding force of the fixing member 11 is reduced and “rattle” occurs between the fixing member 11 and the fixing arm 5, which causes malfunction of the disk device. There is a problem of becoming.

As the type of resin for the synthetic resin arm,
High strength and high rigidity synthetic resin is required, for example PPS
Synthetic resins such as (polyphenylene sulfide resin) and thermotropic liquid crystal resin can be envisioned. These high-strength and high-rigidity resins are highly crystalline and have excellent creep resistance. Therefore, in ordinary joining applications such as joining in general electric parts, these resins cannot find any adverse effect due to the creep phenomenon. That is, in such normal joining, it is not necessary to consider the creep phenomenon in the case of a resin having excellent creep resistance. In particular, a resin whose mechanical strength is reinforced by blending a filler has further excellent creep resistance. However, in the actuator of the magnetic disk device, it is necessary to accurately adjust the movement of the magnetic head with precision of the order of microns,
It has been found by the present inventors that even such a resin having excellent creep resistance can cause a failure due to the creep phenomenon.

In view of this problem of the prior art, the object of the present invention is to prevent "rattle" between the fixed arm and the support arm in the actuator of the disk device even if the fixed arm is made of resin. Is to Another object of the present invention is to provide a method for joining members that does not cause such “rattle”.

[0007]

In order to achieve this object, an apparatus according to the present invention has a support arm for supporting a magnetic head at one end and a fixed arm to which the other end of the support arm is fixed, so An arm part rotatably attached to the arm part, a movable coil fixed to the arm part and arranged in the magnetic circuit of the disk device to apply a rotational force to the arm part in response to energization, and the support arm. In the actuator of the disk device, which is provided with fixing members for fixing the fixing arms through the respective through holes, the fixing member includes a cylindrical portion arranged in the through holes of the fixing arm and a collar portion provided at one end thereof. A first fixing member having, an inserting portion arranged in a through hole of the fixing arm, and a second fixing portion having a flange portion provided at one end thereof. Having. The side surface of the cylindrical portion of the first fixing member presses at least the inner wall of the through hole of the fixing arm, and the side surface of the insertion portion of the second fixing member presses the inner surface of the cylindrical portion of the first fixing member. Alternatively, the cylindrical side surface of the first fixing member contacts at least the inner wall of the through hole of the fixing arm, and the insertion portion of the second fixing member has a side surface contacting the inner surface of the cylindrical portion of the first fixing member and an end portion of the first fixing member. It may be bent outward on the collar portion. Further, each of the collar portions fixes the support arm and the fixed arm toward the mutual contact surfaces.

Here, the contact portion between the cylindrical portion of the first fixing member and the insertion portion of the second fixing member may be provided with a concavo-convex portion that fits with each other. Further, the outer diameter of the insertion end portion of the insertion portion of the second fixing member may be made slightly larger, and a portion for receiving the insertion portion may be provided at a portion where the tubular portion and the flange portion of the first fixing member are adjacent to each other. Further, the insertion portion of the second fixing member may be divided into a plurality of cylindrical portions extending from the flange portion in the axial direction. Further, when there are a plurality of fixed arms in the arm portion, the support arms are fixed to the respective fixed arms, but the inner diameter of the through hole of the fixed arm is larger as it corresponds to the outer fixed arm. You may

On the other hand, in the method of the present invention, when the second joining member is joined to the first joining member, the through holes provided in the first and second joining members are coaxially positioned. The first and second joining members are overlapped with each other, and the first fixing member including the tubular portion having an outer diameter substantially equal to the inner diameter of the through hole of the first joining member and the collar portion provided at one end thereof has the first brim portion. Alternatively, a step of inserting the first and second joining members into the through holes until they come into contact with the second joining member, and an insertion portion having an outer diameter portion slightly larger than the inner diameter of the tubular portion of the first fixing member, and a collar provided at one end thereof. Inserting the second fixing member having a portion into the cylindrical portion of the first fixing member from the opposite direction to the insertion direction until the collar portion contacts the first or second joining member. Is characterized by. Instead of this last insertion step, a second fixing member provided with an insertion portion having an outer diameter substantially equal to the inner diameter of the tubular portion of the first fixing member and a flange portion provided at one end of the insertion portion Alternatively, a step of inserting the first fixing member into the tubular portion of the first fixing member from the opposite direction to the inserting direction until the second fixing member comes into contact, and the second fixing protruding from the flange portion of the first fixing member by this insertion. The step of bending the end portion of the insertion portion of the member onto the flange portion of the first fixing member may be used. Further, instead of this bending step, a step of pressing the tubular portion of the second fixing member from the inside to deform the tubular portions of the first and second fixing members and the inner wall of the through hole of the first joining member may be used. Good.

Here, in the bending step, the second
You may make it bend | fold the end part of the insertion part of a fixing member for each part one by one. Further, when there are a plurality of fixed arms in the arm section, the support arms are fixed to the respective fixed arms, but the inner diameter of the through hole of the fixed arm is larger as the one corresponding to the outer fixed arm. In the inserting step of the second fixing member, the bending step, or the deforming step, these steps may be performed by inserting a tool through the through hole of the outer fixing arm.

In the present invention, preferably, at least the fixed arm is made of synthetic resin. The support arm is usually made of metal to support the magnetic head.
More preferably, the entire arm portion including the fixed arm is made of resin. Since the arm is made of resin, the weight of the arm is reduced, and the arm can be accurately and smoothly rotated by the movable coil. Of course, this also reduces the weight of the entire device.

The synthetic resin which may constitute the arm portion including the fixed arm is the high-strength and high-rigidity synthetic resin as described above, such as polyetheretherketone (PEEK), PPS, and liquid crystallinity when melted. The synthetic resins such as the thermotropic liquid crystal resin shown are generally called engineering plastics. These resins are
It is preferable to add an inorganic filler, preferably an inorganic fibrous filler such as glass fiber, to improve its mechanical strength. Ryton R as PPS
-4 (trade name, 40% by weight glass fiber filling grade, manufactured by Philips Oil Co., Ltd.), etc., and Zyda-G330 (trade name, Nippon Petrochemical Co., Ltd.), which is a wholly aromatic polyester as a thermotropic liquid crystal resin. Commercially available, glass fiber filling grade) (XYDAR is a registered trademark of Amoco Performance Products Inc.) and the like are exemplified.

Among the above-mentioned engineering plastics, thermotropic liquid crystal resin represented by wholly aromatic polyester has a small linear expansion coefficient and is close to that of metal, and is thin and capable of precise molding. It is suitable for an actuator that requires accurate movement, such as a case where it is joined to an arm or a case where the entire arm portion is made of resin.

[0014]

In the present invention as described above, the fixing member for fixing the support arm (or the first joining member) to the fixing arm (or the second joining member) is provided with the cylindrical portion arranged in the through hole of the fixing arm. A first fixing member having a collar portion provided at one end thereof, an insertion portion arranged in a through hole of the fixed arm, and a second portion having a collar portion provided at one end thereof.
The side surface of the cylindrical portion of the first fixing member presses at least the inner wall of the through hole of the fixed arm, and the pressing force is mainly caused by the side surface of the insertion portion of the second fixing member that does not contact the inner surface of the cylindrical portion of the first fixing member. It is caused by pressing. Therefore, the pressing force of the first fixing member applied to the inner wall of the through hole becomes more dispersed. Therefore, even if the arm portion is made of resin, a large pressing force is not locally applied,
The creep phenomenon peculiar to resin is prevented. Therefore, the first
Also, a decrease in the fixing force due to the second fixing member is prevented, and “rattle” does not occur between the supporting arm and the fixing arm.

The side surface of the first fixing member is in contact with the inner wall of the through hole of the fixing arm, and the side surface of the insertion portion of the second fixing member is in contact with the inner surface of the cylindrical portion of the first fixing member and the end portion is the first end. Even when the fixing member is bent outward on the flange portion, the force for bending the end portion is not directly applied to the arm portion but is dispersed through the first fixing member. Is prevented and "rattle" does not occur.

Further, by pressing the cylindrical portion of the second fixing member corresponding to the recess provided in the inner wall of the through hole of the first joining member from the inside, the through holes of the first and second fixing members and the first joining member are formed. When the inner wall is deformed, the force for deforming the second fixing member is dispersed through the first member, so that similarly, the fixing force is prevented from being lowered and “rattle” does not occur.

Further, when the end portion of the insertion portion of the second fixing member is sequentially bent for each portion, the force for bending is further distributed to each portion, so that "rattle" is further generated. To be prevented.

Further, when there are a plurality of fixed arms of the arm portion and the inner diameter of the through hole of the fixed arm is made larger to the one corresponding to the outer fixed arm, the step of inserting the second fixing member and the bending By performing the steps by inserting the tool through the through hole of the outer fixed arm in the step or the deforming step and performing the steps, these steps are easily performed.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. 1A and 1B are a plan view and a side view of an actuator according to an embodiment of the present invention. As shown in the figure, this actuator has a support arm 3 for supporting the magnetic head 1 at one end and a fixed arm 5 to which the other end of the support arm 3 is fixed, and is rotatably attached to a disk device. The arm portion 7 to be fixed, the movable coil 9 fixed to the arm portion 7 and arranged in the magnetic circuit of the disk device, and imparting a rotational force to the arm portion 7 in response to energization, and the support arm 3 with respect to the fixed arm 5. , A fixing member 11 for fixing through each through hole. There are three fixed arms 5, one support arm 3 is fixed to each of the two outer (upper and lower) fixed arms 5, and one support arm 3 is provided above and below the fixed arm 5 in the middle fixed arm 5. Two books are fixed, one for each book. Also,
The fixed arm 5 is provided with a hole 5a that fits into the rotating shaft.

2 (a) to 2 (d) are cross-sectional views showing an example of a portion where the support arm 3 is joined to the fixed arm 5. As shown in FIG. As shown in FIG. 4A, the fixing member 11 includes a fixing member 20 a having a cylindrical portion 21 a arranged in a through hole of the fixing arm 5 and a collar portion 23 a provided at one end thereof, and the fixing arm 5 penetrating therethrough. The fixing member 20b has a cylindrical portion (insertion portion) 21b arranged in the hole and a collar portion 23b provided at one end thereof. Here, before joining, the outer diameter of the cylindrical portion 21a is substantially the same as the inner diameter of the through hole of the fixed arm 5, and the outer diameter of the cylindrical portion 21b is formed slightly larger than the inner diameter of the cylindrical portion 21a. As a result, in the joined state, the side surface of the cylindrical portion 21a presses the inner wall of the through hole of the fixed arm 5, and the side surface of the cylindrical portion 21b presses the inner surface of the cylindrical portion 21a. The side surface of the cylindrical portion 21a may also press the inner wall of the through hole of the support arm 3.
Further, the collar portions 23a and 23b fix the support arm 3 and the fixed arm 5 toward the mutual contact surface 25. The fixed arm 5 is made of resin such as thermotropic liquid crystal polymer, and the support arm 3 is made of stainless steel, for example. As the fixing members 20a and 20b, those made of aluminum or stainless can be used. In the above-described embodiment, the insertion portion 21b is the cylindrical portion 21b.
As shown in FIG. 3, it may be solid instead of hollow.

Here, the fixed arm is Zyder G3 which is a wholly aromatic polyester as a thermotropic liquid crystal resin.
An arm formed by injection molding of 30 (trade name, sold by Nippon Petrochemical Co., Ltd., glass fiber filling grade) was used.

When joining the support arm 3 to the fixed arm 5, the fixed arm 5 and the support arm 3 are positioned so that the through holes provided in the fixed arm 5 are coaxial with each other.
The support member 3 and the support member 3 are overlapped with each other, and the cylindrical portion 21a has an outer diameter substantially the same as the inner diameter of the through hole of the fixed arm 5.
The fixed arm 5 until the collar portion 23a contacts the support arm 3.
Insert into the through hole. Next, the cylindrical portion 21b
Fixing member 20 having an outer diameter portion slightly larger than the inner diameter of a
b until the collar portion 23b contacts the fixed arm 5
Insert into 1a from the opposite side to the inserting direction. As a result, the pressing force of the cylindrical portion 21b is pressed against the inner wall of the through hole of the fixed arm 5 via the cylindrical portion 21a, but this pressing force is dispersed by the cylindrical portion 21a and is locally applied to the inner wall of the through hole. Since the load is suppressed, the subsequent creep phenomenon in the fixed arm 5 is prevented. For this reason, a reduction in the fixing force due to the fixing members 20a and 20b is prevented, and “rattle” does not occur between the support arm 20a and the fixing arm 20b.

In the case of the fixing member shown in FIG. 2 (b),
The fixing member is a fixing member 30a having a cylindrical portion 31a arranged in the through hole of the fixed arm 5 and a flange portion 33a provided at one end thereof, and a cylindrical portion (insertion portion) 31b arranged in the through hole of the fixing arm 5. And a fixing member 30b having a collar portion 33b provided at one end thereof. The inner diameter of the through hole of the fixed arm 5 and the outer diameter of the cylindrical portion 31a are substantially the same, and the inner diameter of the cylindrical portion 31a and the outer diameter of the cylindrical portion 31b are substantially equal. Then, in the joined state, the side surface of the cylindrical portion 31a contacts at least the inner wall of the through hole of the fixed arm 5, the side surface of the cylindrical portion 31b contacts the inner surface of the cylindrical portion 31a, and the end portion of the cylindrical portion 31b is on the flange portion 30a on the outside as shown by the arrow. Is bent to the front side, and each of the collar portions 33a and 33a is bent.
b fixes the support arm 3 and the fixed arm 5 toward the mutual contact surfaces.

In this case, the fixing members 30a and 30b
After being inserted in the same manner, the end portion of the cylindrical portion 31b protruding from the collar portion 33a is bent onto the collar portion 33a by this insertion, whereby the support arm 3 and the fixed arm 5 are fixed. Also in this case, the force for bending the end of the cylindrical portion 31b is not directly applied to the fixed arm 5, and the fixed member 33
Since the particles are dispersed via a, similarly, a decrease in the fixing force is prevented and “rattle” does not occur. The cylindrical portion 31b
By making the outer diameter of the cylinder slightly larger than the inner diameter of the cylindrical portion 31a, the effect of the pressing force can be added as in the embodiment of FIG. Also, the bending of the end of the cylindrical portion 31b may be performed at once by one tool operation,
When each end portion of the cylindrical portion 31b is sequentially bent, it takes time, but it is possible to prevent a large pressing force from being locally applied, and it is possible to fix with a more dispersed force. it can.

In the case of the above-mentioned embodiment, as shown in FIG. 2 (c), the contact portions between the cylindrical portions 21a and 21b may be provided with concave and convex portions which fit with each other. Also,
As shown in FIG. 2 (d), the outer diameter of the insertion end of the cylindrical portion 21b may be made slightly larger, and a portion for receiving this may be provided in the adjacent portion between the cylindrical portion 21a and the flange portion 23a. In the case of FIGS. 2C and 2D, as shown in FIG. 5, the cylindrical portion 21b may be divided into a plurality of cylindrical portions extending from the flange portion 23b in the axial direction thereof. FIG. 6 shows a state of FIG. 2 (d) in the case of this division viewed from the flange portion 23a side.

Further, it facilitates the insertion of the cylindrical portion 21b into the cylindrical portion 21a and the cylindrical portion 2 by the cylindrical portion 21b.
In order to effectively obtain the pressing force of 1a, as shown in FIG. 3, the inner wall of the cylindrical portion 21a has a conical shape with a larger diameter on the side that receives the cylindrical portion 21b, and the outer wall of the cylindrical portion 21b is Is preferably in the shape of a cone that spreads in the opposite direction. Half of the apex angle α of each cone can be selected from an angle in the range of 0 <α ≦ 15 °.

FIG. 7 is a sectional view further illustrating a portion where the support arm 3 is joined to the fixed arm 5. In this case, the fixing member 70a including the cylindrical portion 71a having the outer diameter substantially the same as the inner diameter of the through hole of the fixed arm 5 and the collar portion 73a provided at one end thereof is fixed to the fixing arm 5 until the collar portion 73a contacts the support member 3. Then, a fixing member 70b having a cylindrical portion 71b having an outer diameter substantially the same as the inner diameter of the cylindrical portion 71a and a flange portion 73b provided at one end of the cylindrical portion 71a is brought into contact with the fixed arm 5 by the flange portion 73b. Up to the inside of the cylindrical portion 71a from the direction opposite to the inserting direction, and
By pressing b at several points from the inside, the cylindrical portion 7
The fixed arm 5 and the support arm 3 are fixed to each other by deforming the inner walls of the through holes of the fixed arm 5 and the fixed arms 5. In this case as well, the force that deforms the cylindrical portion 71b is dispersed through the cylindrical portion 71a, so that similarly, a decrease in the fixing force is prevented and "rattle" does not occur. FIG. 8 is a cross-sectional view showing the difference in the diameter of the through hole and the fixing member in each fixing arm 5 when the fixing member shown in FIG. 2 (b) is used. As shown in the figure, the diameters of the through holes and the fixing members in the middle and lower fixed arms 5 are the same, but the diameters of the through holes and the fixing members in the upper fixed arm 5 are larger than the others. In addition, the cylindrical portion 31
The bendable ends of b are the upper and middle fixing members 30.
The one of b is on the upper side, and the one of the lower fixing member 30b is on the lower side. In this case, the bending of the end of the cylindrical portion 31b for fixing the support arm 3 to the intermediate fixed arm 5 is easily performed by inserting a tool through the through hole in the upper fixed arm 5. be able to. Even when the other fixing member shown in FIG. 2 is used, by similarly providing the through holes and the fixing member with different diameters, the insertion of the fixing member and the pressing of the inner wall of the fixing member can be performed more easily. it can.

FIG. 9 is an enlarged sectional view showing the fixing member portion in FIG. As shown in the figure, the brim portion 33a includes a conical portion 91 and a flat portion 93.
The end of b is bent on the conical portion 91 as indicated by the arrow.

FIG. 10 shows a case in which there are four fixed arms 5, and in this case, the uppermost and lowermost fixed arms 5 are provided.
The diameters of the through hole and the fixing member in are larger than those in the two intermediate fixing arms 5. However, as shown in the figure, the fixing members in the two middle fixing arms 5 are provided at the fitting portion 101a fitted to the step portion provided at the end portion of the through hole of the fixing arm 5 and at the end portion thereof. The fixing member 100a has the flange portion 103a formed therein, and the fixing member 100b has the cylindrical portion 101b arranged in the through hole of the fixing arm 5 and the flange portion 103b provided at one end thereof. Further, the fitting portion 101a can be regarded as a composite of the cylindrical portion and the flange portion.

In this case, the bending of the end of the cylindrical member 101b of the second fixed arm 5 from the top can be easily performed from above through the through hole of the uppermost fixed arm 5. Further, bending of the end of the cylindrical member 101b in the third fixed arm 5 from the top can be easily performed from below through the through hole of the lowermost fixed arm 5.

The fixing members 100a and 100b in the two intermediate fixing arms 5 may be the same as those shown in FIG. 2B, as shown in FIG. Further, as shown in FIG. 11, the support arm 3 may be fitted in the recess 111 provided in the fixed arm 5.

Furthermore, the present invention is not limited to the joining of actuators and the like, and can be applied to joining of all members, but is particularly preferable for joining of which precision is required. In the above embodiment, the joining of the resin member and the metal member has been described, but the joining of the resin members may be performed.

[0033]

As described above, according to the present invention, the fixing member for fixing the support arm (or the second joint member) to the fixed arm (or the first joint member) is arranged in the through hole of the fixed arm. A first fixing member having a tubular portion and a collar portion provided at one end thereof and an insertion portion arranged in the through hole of the fixed arm and a second fixing member having a collar portion provided at one end thereof, Since the side surface of the insertion portion of the second fixing member presses the inner surface of the cylindrical portion of the first fixing member to press the inner wall of the through hole of the fixing arm, even when the arm portion is made of resin, the creep phenomenon peculiar to resin is prevented. Therefore, it is possible to prevent “rattle” between the support arm and the fixed arm due to the reduction in the fixing force of the first and second fixing members.

The side surface of the first fixing member is in contact with the inner wall of the through hole of the fixing arm, and the side surface of the insertion portion of the second fixing member is in contact with the inner surface of the first fixing member and the end portion is the first end. Similarly, when the fixing member is bent outward on the flange, "rattle" due to a decrease in the fixing force
Can be prevented.

When the inner wall of the through hole of the first and second fixing members and the first joining member is deformed by pressing the tubular portion of the second fixing member from the inside, the force for deforming the second fixing member is Since the particles are dispersed through the first member, it is possible to prevent “rattle” due to a decrease in fixing force.

Further, when the end portion of the insertion portion of the second fixing member is sequentially bent for each part, the force for bending is further distributed to each part, which further causes "rattle". Can be prevented.

Further, when there are a plurality of fixed arms of the arm portion and the inner diameter of the through hole of the fixed arm is made larger to correspond to the outer fixed arm, the step of inserting the second fixing member and the bending These steps can be easily performed by inserting a tool through the through hole of the outer fixed arm in the step or the deforming step and performing these steps.

[Brief description of drawings]

FIG. 1 is a plan view and a side view of an actuator according to an embodiment of the present invention.

2A to 2C are cross-sectional views showing various examples of a portion for joining a support arm to a fixed arm in the actuator of FIG.

FIG. 3 is a cross-sectional view showing a preferable example in one aspect of FIG.

FIG. 4 is a cross-sectional view showing another preferable example of the aspect of FIG.

5 is a side view showing another preferable example of the one aspect of FIG. 2. FIG.

6 is a plan view showing still another example of the aspect of FIG. 2. FIG.

FIG. 7 is a cross-sectional view further illustrating a portion where the support arm is joined to the fixed arm in the actuator of FIG.

FIG. 8 is a cross-sectional view showing a difference in a diameter of a through hole and a fixing member in each fixing arm when the fixing member according to the aspect of FIG. 2 is used.

9 is an enlarged sectional view showing a fixing member portion in FIG.

FIG. 10 is a partial cross-sectional view showing an embodiment of the present invention in which there are four fixed arms.

FIG. 11 is a partial cross-sectional view showing another aspect of the embodiment of FIG.

FIG. 12 is a partial cross-sectional view illustrating a fixing member according to a conventional example.

[Explanation of symbols]

1: magnetic head, 3: support arm, 5: fixed arm,
7: Arm part, 9: Moving coil, 11: Fixed member, 20
a, 20b, 30a, 30b, 70a, 70b, 100
a, 100b: fixing member, 21a, 21b, 31a, 3
1b, 71a, 71b, 101b: cylindrical portion, 73a, 7
3b, 23a, 23b, 33a, 33b, 103b: Collar portion, 25: Contact surface, 91: Conical portion, 93: Flat portion, 1
01a: Fitting portion, 103a: Collar portion, 111: Recessed portion.

Claims (12)

[Claims] 1. A support arm for supporting a magnetic head at one end, a fixed arm to which the other end of this support arm is fixed, and an arm portion rotatably attached to a disk device, fixed to this arm portion. A movable coil that is disposed in the magnetic circuit of the disk device and that applies a rotational force to this arm portion in response to energization, and a fixing member that fixes the support arm to the fixed arm through the respective through holes. In the actuator of the disk device provided, the fixing member is arranged in the through hole of the fixed arm and the first fixing member having the tubular portion arranged in the through hole of the fixed arm and the flange portion provided at one end thereof. A second fixing member having an insertion portion and a collar portion provided at one end thereof, and at least the side surface of the cylindrical portion of the first fixing member is the fixing arm. The inner wall of the through hole of the second fixing member, the side surface of the insertion portion of the second fixing member presses the inner surface of the cylindrical portion of the first fixing member,
Further, each of the collar portions fixes the support arm and the fixed arm toward the mutual contact surface, and the actuator of the disk device. 2. A support arm for supporting a magnetic head at one end, a fixed arm to which the other end of the support arm is fixed, and an arm portion rotatably attached to a disk device, fixed to this arm portion. A movable coil that is disposed in the magnetic circuit of the disk device and that applies a rotational force to this arm portion in response to energization, and a fixing member that fixes the support arm to the fixed arm through the respective through holes. In the actuator of the disk device provided, the fixing member is arranged in the through hole of the fixed arm and the first fixing member having the tubular portion arranged in the through hole of the fixed arm and the flange portion provided at one end thereof. A second fixing member having an insertion portion and a collar portion provided at one end thereof, and at least the side surface of the cylindrical portion of the first fixing member is the fixing arm. The inner surface of the second fixing member is in contact with the inner wall of the through hole of the first fixing member, the side surface is in contact with the inner surface of the cylindrical portion of the first fixing member, and the end portion is bent outward on the flange portion of the first fixing member. An actuator for a disk device, wherein the collar portion fixes the support arm and the fixed arm toward the mutual contact surfaces. 3. The contact portion between the cylindrical portion of the first fixing member and the insertion portion of the second fixing member is provided with an uneven portion that fits with each other. Alternatively, the actuator of the disk device described in 2. 4. The outer diameter of the insertion end portion of the insertion portion of the second fixing member is made slightly larger, and a portion for receiving the insertion portion is provided in a portion where the tubular portion and the collar portion of the first fixing member are adjacent to each other. The actuator of the disk device according to claim 1 or 2. 5. The actuator for a disk device according to claim 3, wherein the insertion portion of the second fixing member is divided into a plurality of cylindrical portions extending from the flange portion in the axial direction thereof. 6. A plurality of fixed arms of the arm portion, the support arms are fixed to the respective fixed arms, and the inner diameter of the through hole of the fixed arm is larger as it corresponds to the outer fixed arm. Claims 1 to 1 characterized
6. The actuator of the disk device according to any one of 5 above. 7. When joining the second joining member to the first joining member, the first and second joinings are arranged so that the through holes provided in the first and second joining members are coaxially located. The first fixing member having the tubular portion having the outer diameter substantially the same as the inner diameter of the through hole of the first joining member and the collar portion provided at one end of the first joining member is used as the first or second joining member. A step of inserting the first and second joining members into the through holes until they come into contact with each other, and a second step of providing an insertion portion having an outer diameter portion slightly larger than the inner diameter of the cylindrical portion of the first fixing member and a collar portion provided at one end thereof And the step of inserting the fixing member into the tubular portion of the first fixing member from the direction opposite to the direction of insertion until the collar portion contacts the first or second joining member. . 8. When joining the second joining member to the first joining member, the first and second joinings are arranged so that the through holes provided in the first and second joining members are coaxially located. The first fixing member having the tubular portion having the outer diameter substantially the same as the inner diameter of the through hole of the first joining member and the collar portion provided at one end of the first joining member is used as the first or second joining member. Inserting into the through holes of the first and second joining members until they come into contact with each other, and a second step including a inserting portion having an outer diameter substantially the same as the inner diameter of the cylindrical portion of the first fixing member and a collar portion provided at one end thereof. The step of inserting the fixing member into the cylindrical portion of the first fixing member from the opposite direction of the insertion until the flange portion contacts the first or second joining member, and the collar portion of the first fixing member is inserted by this insertion. Bend the end portion of the insertion portion of the second fixing member protruding from the flange portion of the first fixing member. And a bonding step. 9. When joining the second joining member to the first joining member, the first and second joinings are arranged so that the through holes provided in the first and second joining members are coaxially located. The first fixing member having the tubular portion having the outer diameter substantially the same as the inner diameter of the through hole of the first joining member and the collar portion provided at one end of the first joining member is used as the first or second joining member. Inserting into the through holes of the first and second joining members until they come into contact with each other, and the second step including a tubular portion having an outer diameter substantially the same as the inner diameter of the tubular portion of the first fixing member and a flange portion provided at one end thereof. Inserting the fixing member into the cylindrical portion of the first fixing member from the direction opposite to the inserting direction until the collar portion contacts the first or second joining member; and inserting the cylindrical portion of the second fixing member from the inside. By pressing, the first and second fixing members and the first
And a step of deforming an inner wall of the through hole of the joining member. 10. The joining method according to claim 8, wherein in the bending step, the end portion of the insertion portion of the second fixing member is sequentially bent for each portion. 11. A support arm for supporting a magnetic head at one end, a fixed arm to which the other end of this support arm is fixed, and an arm portion rotatably attached to a disk device, fixed to this arm portion. A movable coil that is disposed in the magnetic circuit of the disk device and that applies a rotational force to this arm portion in response to energization, and a fixing member that fixes the support arm to the fixed arm through the respective through holes. The actuator according to claim 7, wherein the fixed arm and the support arm in the actuator of the disk device are the first and second joining members, and the fixing member is the first and second fixing members.
The bonding method according to any one of 0. 12. The plurality of fixed arms of the arm portion, the support arms are fixed to the respective fixed arms, and the inner diameter of the through hole of the fixed arm is larger as it corresponds to the outer fixed arm. In the inserting step of the second fixing member, the bending step, or the deforming step,
Insert the tool through the through hole of the outer fixed arm,
The joining method according to claim 11, wherein the inserting step of the second fixing member, the bending step, or the deforming step is performed.