JPH056638A - Attaching structure for magnetic-head supporting assembly in magnetic disk apparatus - Google Patents

Abstract

PURPOSE:To obtain sufficient fastening force when a magnetic-head supporting assembly is fastened to the guide arm of a magnetic disk apparatus swaging. CONSTITUTION:One end of a guide arm 6 is fastened to a main body 7 of a carriage. Two boss-inserting holes 8 are arranged in the other end without mutual interference with an interval being provided. Two boss-inserting holes 8 are made to penetrate from the upper surface to the lower surface of the guide arm. Bosses 5 of a fastening member 4 of the magnetic-head supporting assembly are inserted into the holes. The boss-inserting holes 8 and the bosses 5 are fastened by swaging. One end of a magnetic-head supporting spring 3 is welded to the fastening member 4. A gimbal spring 9 for directly supporting the magnetic head 2 is welded to the other end of the magnetic-head supporting spring 3. The magnetic head 2 is arranged so as to face each magnetic disk 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for a magnetic head support assembly in a magnetic disk device, and more particularly to a fastening member used for mounting the magnetic head support assembly to a guide arm. The mounting structure of the magnetic head support assembly in the magnetic disk device, which is suitable for high-density mounting of the magnetic head support assembly, depending on the arrangement of the boss and the boss insertion hole provided in the guide arm for fitting with the boss. Regarding

[0002]

2. Description of the Related Art Regarding the structure of a fastening portion between a magnetic head support assembly and a guide arm in a magnetic disk device,
For example, the invention disclosed in US Pat. No. 4,829,395 is known.

FIG. 9 shows the structure of the fastening portion between the magnetic head support assembly and the guide arm disclosed in the above publication. As shown in the figure, the carriage body 14 and the guide arm 13 have an integrated structure without a fastening portion,
One boss insertion hole 15 is provided at the tip of the guide arm 13. The boss insertion hole 15 penetrates from the upper surface to the lower surface of the guide arm 13, and the bosses 12 provided on the fastening members 11 of the magnetic head support assembly, which are provided to face each other, are inserted from opposite sides. ing. The inserted boss 12 and the boss insertion hole 15 are fastened by inserting a processing jig into the hollow portion of the boss 12 and swaging the boss 12 in the diameter direction thereof.

The fastening member 11 includes a magnetic head support spring 1
One end of 0 is welded, and the other end is welded with a gimbal spring 9 that directly supports the magnetic head 2. The magnetic heads 2 are arranged so as to face the magnetic disks 1, respectively. In this way, the rotary actuator is constructed.

As described above, in the prior art, the boss 12 and the boss insertion hole 15 for mounting the pair of magnetic head supporting assemblies provided on the upper and lower sides to the guide arm 13 are coaxially arranged. Therefore, the bosses 12 of the fastening members 11 of the two magnetic head support assemblies facing each other have the same boss insertion hole 1.
5, the height of the boss 12 must be 1/2 or less of the length of the boss insertion hole 15 (thickness of the guide arm).

[0006]

In the above prior art, the boss of the fastening member for mounting the magnetic head support assembly to the guide arm is coaxially arranged, and the height of the boss is inevitable. The length of the boss insertion hole (thickness of the guide arm) must be 1/2 or less. Therefore,
In the prior art, there is a problem in that the boss height cannot be sufficiently obtained, so that the fastening force due to the swaging of the boss insertion hole and the boss cannot be sufficiently obtained.

Furthermore, with the recent increase in capacity of magnetic disk devices, there has been a demand for high-density mounting of magnetic disks and magnetic head support assemblies. Specifically, due to the reduction in the stacking interval of magnetic disks. The guide arm tends to be thin. To reduce the thickness of the guide arm, a boss insertion hole that penetrates the guide arm is provided, and when the pair of magnetic head support assemblies is vertically mounted on the guide arm by swaging, the length of the boss insertion hole is restricted. become. Therefore, in the prior art, in addition to the fact that the height of the boss must be ½ or less of the length of the boss insertion hole, the length of the boss insertion hole itself is restricted to be short, so However, there is a problem in that the fastening force between the magnetic head support assembly and the guide arm cannot be sufficiently increased.

The boss is used not only for producing a fastening force but also for positioning the magnetic head support assembly. In this case, the regulation for the height of the boss is
There is a problem that it hinders accurate positioning.

Therefore, if the boss is arranged coaxially as in the prior art, a sufficient fastening force cannot be obtained between the guide arm and the magnetic head support assembly, or the magnetic head support assembly cannot be obtained. There was a problem that accurate positioning could not be performed.

An object of the present invention is to provide a mounting structure for a magnetic head support assembly in a magnetic disk drive which can obtain a sufficient fastening force even when the guide arm is made thin and can perform accurate positioning. To do.

[0011]

SUMMARY OF THE INVENTION To achieve the above objects, the present invention is directed to at least two bosses and their bosses for fastening a pair of magnetic head support assemblies mounted back to one guide arm. The insertion holes are arranged so as not to overlap each other.

[0012]

The bosses of the magnetic head support assembly arranged so as not to overlap each other are not restricted in height to less than half the thickness of the guide arm as in the prior art described above.
Since the required boss height can be freely set, a sufficient fastening force can be obtained, and the sufficient boss height can be freely set, so that accurate positioning can be performed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be explained.

FIG. 1 is a sectional view showing a first embodiment of the present invention. As shown in FIG. 1, one end of the guide arm 6 is attached to the carriage main body 7, and two boss insertion holes 8 are provided on the other end side at regular intervals without interfering with each other. There is. The two boss insertion holes 8 penetrate from the upper surface to the lower surface of the guide arm 6, and the boss 5 provided on the fastening member 4 of the magnetic head support assembly is inserted into the boss insertion hole 8 and the boss 5 by swaging. Has been concluded by.

One end of a magnetic head support spring 3 is welded to the fastening member 4, and a gimbal spring 9 that directly supports the magnetic head 2 is welded to the other end. The magnetic heads 2 face the magnetic disk 1, respectively. Are arranged so as to form a rotary actuator as a whole. In addition,
When only one magnetic head support assembly is fastened to the guide arm 6, it is sufficient to provide only one boss insertion hole 8 in the guide arm 6.

According to the first embodiment shown in FIG. 1, since only one boss 5 is inserted into one boss insertion hole 8, the height of the boss 5 is equal to the length of the boss insertion hole 8. Equivalent dimensions can be taken. Therefore, even if the thickness of the guide arm 6 is reduced, a sufficient fastening force can be obtained between the boss insertion hole 8 and the boss 5.

2 to 5 show the arrangement of the boss insertion hole 5 provided at the tip of the guide arm 6 and the boss 5 provided in the fastening member 4 of the magnetic head support assembly as viewed from above. Here is an example.

In the second embodiment shown in FIG. 2, the two boss insertion holes 8 are arranged on the line 35 connecting the actuator rotation center and the magnetic head 2. In the figure, 16 indicates a signal transmission conductor protection tube.

In the third embodiment shown in FIG. 3, the two boss insertion holes 19 are arranged perpendicularly to the line 35 connecting the actuator rotation center and the magnetic head 2. In the figure, 17
Is a fastening member, 18 is a boss, and 20 is a guide arm.

In the fourth embodiment shown in FIG. 4, the two boss insertion holes 23 are arranged at an angle to the line 35 connecting the actuator rotation center and the magnetic head 2.
In the figure, 21 is a fastening member, 22 is a boss, and 24 is a guide arm.

In the fifth embodiment shown in FIG. 5, each of the upper and lower fastening members 25 has two bosses 26, and the four boss insertion holes 27 form the line 35 connecting the actuator rotation center and the magnetic head 2. Two target arms are arranged in parallel on the guide arm 28.

FIG. 6 shows a sixth embodiment of the present invention, in which the fastening member 29 of the magnetic head support assembly and the magnetic head support spring 3 are positioned at positions corresponding to the bosses of the magnetic head support assembly facing the other side. It is characterized in that a through hole 31 is provided. As shown in the figure, the carriage 30 has an integral structure having no fastening part with the guide arm, and two boss insertion holes 8 are provided at the tip of the guide arm. The diameter of the through hole 31 is set larger than the inner diameter of the boss 5 so that the swaging tool can pass through the inner hole of the boss to the opposite side. As a result, even if the carriage 30 is formed integrally with the guide arm, the boss 5 and the boss insertion hole 8 can be swaged by the swaging tool.

FIG. 7 is a sectional view showing a seventh embodiment of the present invention, which is characterized in that the magnetic head support assembly is fastened to the carriage 30 by adhesion. The carriage 30 has an integral structure having no fastening part with the guide arm, and two boss insertion holes 8 are provided at the tip of the guide arm. Since the magnetic head support assembly is fastened to the carriage 30 by adhesion (adhesive layer 32), it is not necessary to fasten the boss insertion hole 8 and the boss 5 by swaging. In this case, the boss insertion hole 8 and the boss insertion hole 8 are fastened. Reference numeral 5 is used as a positioning reference when the magnetic head support assembly is attached to the carriage. Therefore, in the seventh embodiment, the through hole 31 is provided at a position corresponding to the boss 5 of the magnetic head support assembly, but since swaging is not performed, this through hole 31 may be omitted.

When the fastening force between the magnetic head support assembly and the guide arm is not sufficient by bonding or swaging, a sufficient fastening force can be obtained by using both bonding and swaging. In this case,
The through hole 31 is useful.

FIG. 8 is a sectional view showing an eighth embodiment of the present invention, which is characterized in that the boss insertion hole 34 provided at the tip of the guide arm 33 is not penetrated. As shown in the figure, one end of the guide arm 33 is attached to the carriage main body 7, and boss insertion holes 34 that do not penetrate are provided in the upper and lower surfaces of the guide arm 33, respectively. The boss 5 of the fastening member 4 of the magnetic head support assembly is inserted into the boss insertion hole 34 and fastened by swaging. In this case, since the boss insertion hole 34 does not penetrate, when the carriage body 7 and the guide arm 33 are integrally formed, swaging becomes difficult from the viewpoint of tool operability. Therefore, the carriage body 7
The guide arm 33 is formed separately, and the guide arm 33 is attached to the carriage body 7 after swaging.

As shown in the figure, the boss insertion hole 34 is not provided on the surface of the guide arm 33 to which the magnetic head support assembly is not attached.

As is clear from the above description, according to the above embodiment, it is sufficient for the thin plate guide arm corresponding to the narrowing of the stacking interval of the magnetic disks due to the high density mounting of the magnetic disk device. The fastening force can be obtained.
Also, since it is possible to increase the fastening force sufficiently,
The thickness of the guide arm can be reduced to 1/2 of the thickness of the guide arm in the related art.

[0028]

According to the present invention, a mounting structure for a magnetic head support assembly in a magnetic disk drive capable of obtaining a sufficient fastening force even when the guide arm is thin and capable of performing accurate positioning. Can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a mounting structure of a magnetic head support assembly in a magnetic disk device of the present invention.

FIG. 2 is a top view showing a second embodiment of the mounting structure of the magnetic head support assembly in the magnetic disk device of the present invention.

FIG. 3 is a top view showing a third embodiment of the mounting structure of the magnetic head support assembly in the magnetic disk device of the present invention.

FIG. 4 is a top view showing a fourth embodiment of the mounting structure of the magnetic head support assembly in the magnetic disk device of the present invention.

FIG. 5 is a top view showing a fifth embodiment of the mounting structure of the magnetic head support assembly in the magnetic disk device of the present invention.

FIG. 6 is a top view showing a sixth embodiment of the mounting structure of the magnetic head support assembly in the magnetic disk device of the present invention.

FIG. 7 is a sectional view showing a seventh embodiment of the mounting structure of the magnetic head support assembly in the magnetic disk device of the present invention.

FIG. 8 is a sectional view showing an eighth embodiment of the mounting structure of the magnetic head support assembly in the magnetic disk device of the present invention.

FIG. 9 is a sectional view showing an example of a mounting structure of a magnetic head support assembly in a conventional magnetic disk device.

[Explanation of symbols]

1 magnetic disk 2 magnetic head 3,10 Magnetic head support spring, 4,11,17,21,25,29 Fastening members, 5,12,18,22,26 Boss, 6,13,20,24,28,33 guide arm, 7,14,30 Carriage body, 8, 15, 19, 23, 27, 34 Boss insertion holes, 9 Gimbal spring, 16 Conductive wire protection tube for signal transmission, 31 through holes, 32 adhesive layer, 35 A line connecting the center of rotation of the actuator and the magnetic head.

Claims (2)

[Claims] 1. A guide arm having a boss insertion hole, two magnetic head support assemblies provided on the back of the guide arm, and each magnetic head support assembly provided in the boss insertion hole. A boss provided on each of the fastening members and a boss insertion hole provided on the guide arm. In the mounting structure of the magnetic head support assembly in the magnetic disk device fastened by fitting with each other, at least two boss insertion holes are provided, and at least one boss of each fastening member is provided. A mounting structure for a magnetic head support assembly in a magnetic disk drive, wherein each boss provided on a member is fitted into a boss insertion hole in a position where they do not overlap each other. 2. The bosses are formed in a hollow shape, and by swaging the bosses, the magnetic head support assembly and the guide arm are fastened via fastening members. A mounting structure for a magnetic head support assembly in a magnetic disk device as described above.