JP2571324B2 - Magnetic head support structure and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head support structure and a method of manufacturing the same.

[0002]

2. Description of the Related Art FIG. 5 is a plan view showing a main part of a general magnetic disk drive, and shows a magnetic head supporting structure (1).
Are assembled and manufactured by welding and fixing a thick base plate (2) mounted on a magnetic head arm, a thin load beam (3), and a thin gimbal spring (4) for mounting a magnetic head slider. I was As shown in FIG. 4, the magnetic head supporting structure (1) fixes a base plate (2) to the tip of a swingable supported magnetic head arm (6) and magnetically attaches a tip of a gimbal spring (4). The magnetic head is formed by bonding the head slider (5). In FIG. 4, (7)
Indicates an actuator, and (CD) indicates a magnetic disk .

[0003]

As described above, when the welding or caulking method is employed as a means for fixing the base plate (2) to the load beam (3) and the gimbal spring (4), the base plate (2) and the load are fixed. As a magnetic head support structure (1) completed by accumulating the combination of the assembly accuracy between the beam (3) and the gimbal spring (4) and the accuracy of individual components, the parallelism, center, or length of each component is completed. There has been a problem that the direction deviation and the torsion exceed the allowable limit. For this reason, the accuracy of the magnetic disk (CD) as the magnetic head support structure (1) is reduced, the magnitude of the contact load on the magnetic disk (CD) fluctuates, and information is read according to the characteristics of the magnetic disk (CD). The problem was that writing was hindered.

The contact load is applied by bending the load beam (3) and the gimbal spring (4), and the difference in the contact load is adjusted in a later step of assembling the parts. However, when such an individual adjustment method is adopted, the number of steps such as a contact load adjustment step is increased, and the cost of the magnetic disk drive is increased.

In addition, in order to maintain the dimensional accuracy of the finished product within an allowable limit during assembly, a complicated positioning jig is required, which not only increases the number of steps but also makes it difficult to reduce equipment costs. . In addition, conventionally,
One mounting part, load beam part and gimbal spring part
Japanese Patent Application Laid-Open (JP-A) No. 58-18506 discloses a proposal for integrally connecting products
No. 2, this proposal proposes a magnetic head
Attach the arm to the load beam and gimbal.
Since it is interpreted to be made with the same thickness as the spring part,
There is a problem. In other words, the thickness of the load beam
Thin (for example, about 70 μm).
If you make a mounting part to the head arm, strength will be insufficient,
Welding structure to attach load beam to magnetic head arm
And the problem of thermal distortion occurs. In the above proposal,
It states that it may be fixed with screws, but actually,
Deformation such as twisting or bending of the load beam when fixed with the same
Is likely to occur, and recording / reproduction errors occur on the magnetic disk.
Or damage may occur.

[0006]

According to the present invention, a thin plate-like load beam is machined such that a thick magnetic head mounting base is mounted on one end and a magnetic head slider is mounted on the other end. Thin gimbal spring ,
The magnetic head supporting structure and the linear steel material are formed by rolling and molding a linear steel material in an integrated manner, and are sequentially rolled and formed by a rolling roll and a mold roll, and a thick wall is mounted between the tie bars at both ends. Forming a strip-shaped deformed cross-section steel material having a cross-sectional shape in which a base forming portion, a thin-walled load beam forming portion, and a thin-walled gimbal spring forming portion are connected perpendicularly to a rolling direction; Rolled steel material is processed on its side along its length, and the mounting base,
An intermediate structure is formed in which a large number of magnetic head supporting structure elements in which a load beam part and a gimbal spring part are coaxially connected are arranged side by side at predetermined pitch intervals at right angles between tie bars at both ends. Forming the intermediate structure, bending the load beam portion by molding, notching / cutting / raising the mounting position of the magnetic head slider of the gimbal spring portion by press etching, and tie-bar portions at both ends. And a step of separating a plurality of magnetic head support structures from the substrate and dividing the same.

[0007]

The magnetic head support structure is made of a single-piece molded body in which no welded portion is interposed between the components by rolling and deforming a cross section of a linear steel material and press punching. Prevent unevenness of accuracy due to the combination.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific example of the present invention will be described below with reference to FIGS.

First, a linear steel material is flatly crushed by a rolling roll with a mold roll, and is rolled and formed by a successive mold roll, whereby a slightly large thickness for mounting on a magnetic head arm (6) as shown in FIG. (T ₁ ) between the mounting base forming portion (12A) and the gimbal spring (14) forming portion (14A) having a thinner thickness (t ₃ ) than the mounting base forming portion (12A). creating a load beam forming section equipped thickness of (t ₂₎ (13A) tie bar forming part at both ends a strip of irregular cross section rolled steel having an articulated cross-sectional shape (9A) (9) connecting.

Next, as shown in FIG. 3, the strip-shaped deformed cross-section steel material is pressed from the side along the length direction, and a mounting base portion (12B) for mounting to a magnetic head arm, a load beam. Tie bar portions (9B) and (9B) at both ends where a large number of magnetic head supporting structure bodies (10A) in which a portion (13B) and a gimbal spring portion (14B) are coaxially arranged in series are arranged in parallel and opposed to each other in the rolling direction To create an intermediate structure (9C) aligned at a predetermined pitch interval (P).

Next, the load beam portion (13B) of the intermediate body (10A) of the magnetic head supporting structure is attached to the mounting base portion (12).
B) Curve in an arch shape at a predetermined predetermined position (FIG. 1)
(Indicated by reference number (13C) in (B)). At the same time, in the longitudinal direction of the load beam portion (13B) (shown in FIG. 1B)
The reinforcing pieces are formed by bending the side edges (11) and (11) upward, and the mounting portion of the magnetic head slider (5) is formed at the tip by bending the gimbal spring portion (14B) horizontally.

The shape of the gimbal spring (14) is not fixed depending on the model. For example, in FIG. 1, the slider (5) is hatched to elastically support the slider (5). And a gimbal spring (14) at the tip of the load beam (13).
There is a U-shaped notch for cutting up.

After that, before separating the element body (10A) of each magnetic head supporting structure from the tie bar portions (9B) and (9B), each of the gimbal spring portions (14) bent horizontally.
The magnetic head slider (5) is mounted on the lower surface of (B).

Finally, the element body (10A) of the plurality of magnetic head supporting structures is connected to the tie bars (9A) of the intermediate structure (9C).
B) Separate from the part (9B) by the batch cutting method. In this manner, a magnetic head support structure (10) in which the mounting base (12) to be mounted on the magnetic head arm (6), the load beam (13), and the gimbal spring (14) are integrally formed is obtained.

The magnetic head supporting structure (1) shown in the above embodiment
In the integral molding of 0), the thickness of the load beam (13) is selected in consideration of the vibration characteristics (amplitude-natural frequency curve) of the magnetic head support structure (10). For example, the thickness t near the mounting base portion (12) to the magnetic head arm (6)
₂ is thicker than the thickness t ₃ of the gimbal spring (14) side,
It is possible to apply varying the thickness of the load beam (13) along its longitudinal direction so as to reduce the amplitude by increasing the natural frequency of the magnetic head support structure.

In the above embodiment, the case where the thick magnetic head mounting base is replaced with a base having a base plate superposed on the base end of the load beam has been described. For example, the magnetic head arm is coaxial with the load beam. For those having a simple shape extending upward, the mounting base may be formed as a series of integral structures including a magnetic head arm to which the base plate is mounted.

[0017]

According to the present invention, the mounting base and the load beam of a magnetic head, pressure gimbal spring from a single steel
Because it is being rolled molded integrally, not caused such as unevenness of conventional welding and assembling and parts accuracy has been a problem At a magnetic head support structure which each member is assembled by caulking, or a combination component material, Problems such as the occurrence of non-defective products and the reduction in productivity due to the work of positioning or correcting the positional deviation of the assembled parts are solved. In particular, the mounting base
Load bee as thick (for example, about 300 μm)
(For example, about 70 μm thick).
The base plate of another member to the mounting base part.
Contact or when welding directly to the magnetic head arm.
Deformation problems such as thermal distortion.
Reduce man-hours (correction processing), improve part accuracy, reduce costs
Can be achieved.

Further, since a large number of load beam bending processes and gimbal spring processes are performed simultaneously while being attached to the tie bar, the characteristics are made uniform and the number of steps is greatly reduced.

Furthermore, since the roll beam is formed, it is easy to sequentially change the thickness of the load beam from the tip to the base, so that the vibration characteristics of the magnetic head supporting structure can be controlled at the design stage.

Further, since the magnetic head supporting structure including the magnetic head arm can be integrally formed, a thin and small one can be obtained.

[Brief description of the drawings]

FIG. 1A is a plan view of a magnetic head supporting structure according to the present invention. FIG. 1B is a side view of a magnetic head supporting structure according to the present invention.

2A is a plan view of a drawn wire-rolled steel material, and FIG. 2B is a longitudinal sectional view taken along a line II-II in FIG.

3A is a plan view of an intermediate structure of a magnetic head supporting structure. FIG. 3B is a longitudinal sectional view taken along line III-III in FIG.

FIG. 4 is a schematic plan view of a magnetic head disk device.

5A is a plan view of a conventional magnetic head support structure, and FIG. 5B is a side view of a conventional magnetic head support structure.

[Explanation of symbols]

 Reference Signs List 9 belt-shaped deformed steel material 10 magnetic head support structure 12 mounting base for magnetic head 13 load beam 14 gimbal spring

Claims (2)

(57) [Claims] 1. A thin gimbal spring machined to attach a thick magnetic head mounting base to one end of a thin plate-shaped load beam and a magnetic head slider to the other end.
Wherein a linear steel material is roll-formed and integrally formed . 2. A linear steel material is sequentially rolled and formed by a rolling roll and a mold roll, and a thick-walled mounting base forming portion, a thin-walled load beam forming portion, and a tie bar portion at both ends.
A step of forming a strip-shaped deformed cross-section steel material having a cross-sectional shape in which the thin-walled gimbal spring forming portion is connected perpendicularly to the rolling direction; and forming a side surface along the length direction of the strip-shaped deformed cross-section steel material. After processing, a number of magnetic head supporting structure bodies in which the mounting base portion, the load beam portion, and the gimbal spring portion are coaxially connected are arranged side by side at predetermined pitch intervals orthogonally to the tie bar portions at both ends. Forming a molded intermediate structure; bending the load beam portion by molding the intermediate structure; cutting and raising the magnetic head slider mounting position of the gimbal spring portion by pressing and etching; A method of manufacturing a magnetic head support structure, comprising: applying a plurality of magnetic head support structures from a tie bar portion at both ends, and separating the plurality of magnetic head support structures.