JP2003178543A - Magnetic head supporting mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic head supporting mechanism which is used for a magnetic disk device and prevents the degradation in the adhesive strength between a magnetic head and gimbals even if the magnetic head is formed to a smaller size. <P>SOLUTION: The magnetic head supporting mechanism having a suspension 10 constructed to support a core slider 13 bonded with the magnetic head at the gimbals 12 of a spring arm 11 is provided with an expanded area section 12B in the side part of a position where the core slider 13 of the gimbals 12 is disposed. The flank of the core slider 13 is adapted to be bondable to the gimbals 12. <P>COPYRIGHT: (C)2003,JPO

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 mechanism used in a magnetic disk device.

In recent years, a magnetic disk device, which is a kind of external storage device for a computer, has been rapidly required to have a smaller size and a larger capacity. One way to increase the capacity of this magnetic disk device is to increase the number of magnetic disks mounted on the spindle. There is also a method of increasing the recording density per unit area by innovating the element technology of the magnetic head and the magnetic disk. For example, technical development of a magnetoresistive head (MR head) in a magnetic head can be mentioned.

[0003]

2. Description of the Related Art Conventionally, various magnetic head supporting mechanisms have been proposed. For example, the magnetic head support mechanism disclosed in Patent Document 1 has a suspension in which a spring arm and a gimbal are integrally formed by etching or pressing one stainless plate material.

A core slider having a magnetic head is mounted on a gimbal using an adhesive. A wiring pattern connected to the magnetic head is formed on the suspension. The wiring pattern is formed by depositing an insulating layer, a conductive layer, and a protective layer in this order on the suspension.

The wiring pattern and the magnetic head are electrically connected using a gold ball or the like. This wiring pattern is
It is connected to a flexible wiring board provided in the magnetic disk device and transmits write signals and read signals. Such a suspension is fixed to a carriage arm of a magnetic disk device directly or via a slider.

[0006]

[Patent Document 1] Japanese Patent Laid-Open No. 6-215513 (FIG. 1,
(Fig. 2)

[0007]

By the way, in recent years, as the density and size of the magnetic disk and the magnetic head have been reduced, the core slider tends to be downsized. In addition, with the miniaturization of the core slider, the gimbal mounting the same has also been miniaturized.

Further, in the past, the magnetic head had a structure in which an adhesive was applied to the bottom surface of the magnetic head to adhere it to the gimbal, so that the adhesion area of the magnetic head on the gimbal was equal to the area of the bottom surface of the magnetic head. .

Therefore, when the magnetic head and the gimbal are downsized, the adhesion area of the magnetic head on the gimbal is accordingly reduced. However, the adhesive force between the magnetic head and the gimbal correlates with the adhesive area, and the adhesive force decreases as the adhesive area decreases. Therefore, the conventional magnetic head support mechanism has a problem that when the magnetic head is downsized, the adhesive force between the magnetic head and the gimbal is weakened, and the reliability of the magnetic head support mechanism may be reduced. It was

The present invention has been made in view of the above points, and it is an object of the present invention to provide a magnetic head support mechanism capable of preventing a decrease in adhesive force between a magnetic head and a gimbal even if the magnetic head is downsized. To aim.

[0011]

In order to solve the above problems, the present invention is characterized by the following means.

According to a first aspect of the present invention, in a magnetic head supporting mechanism having a suspension configured to support a core slider having a magnetic head bonded to a gimbal of a spring arm, the width and length of the gimbal are set to the core slider. It is characterized by being set larger than the width and the length.

According to a second aspect of the present invention, in a magnetic head support mechanism having a suspension configured to support a core slider having a magnetic head bonded to a gimbal of a spring arm, the core slider of the gimbal is arranged. It is characterized in that an area enlargement portion is provided on the side portion of the open position.

According to the first and second aspects of the invention,
By setting the width and length of the gimbal to be larger than the width and length of the core slider, and by forming an enlarged area on the side of the gimbal where the core slider is located, the core slider can be attached to the gimbal. At the time of bonding, the adhesive can be provided on the side surface as well as the bottom surface of the core slider.

As a result, it is possible to widen the bonding area between the gimbal and the core slider, and to securely fix the gimbal and the core slider even if the core slider is downsized, and to improve the reliability of the magnetic head support mechanism. Can be increased.

1 is a perspective view showing a magnetic head support mechanism according to an embodiment of the present invention. The magnetic head support mechanism has a suspension 10 and a spacer 20. As will be described later, the main feature of this embodiment is that the positioning hole 17, the side angle of the carriage arm (not shown in FIG. 1) and the side angle of the spacer 20 are the same, and the terminal portion is formed along the side surface of the spacer 20. 19 is provided.
By adopting these configurations, the assembling workability can be improved.

The suspension 10 has a spring arm 11, a gimbal 12, a rib portion 15, a slit 16 and a positioning hole 17. The portion having the positioning hole 17 is wider than the other portion in a tapered shape.

The spring arm 11 can be formed by etching or pressing a stainless plate material, for example.
A wiring pattern 14 is formed on the spring arm 11. One end of the wiring pattern 14 is the core slider 1
3 is connected to the magnetic head, and the other end is a terminal portion 19.

The rib portion 15 is provided at a position apart from the spacer 20, and gives the spring arm 11 a predetermined bending characteristic. The slits 16 of the spring arm 11 are provided on both sides of the wiring pattern 14 to realize low rigidity and high frequency characteristics and to reduce the moment applied to the core slider 13 when the magnetic disk is mounted.

2A and 2B are views showing two structural examples of the tip portion of the spring arm 11. The gimbal 12 has a cantilever (cantilever) structure, and a core slider 13 having a magnetic head is fixed on the gimbal 12 with an adhesive.

The wiring pattern 14 extends to the gimbal 12 through the bridge portion 12A. A conductive layer, which will be described later, is exposed at the tip of the wiring pattern 14, and the conductive layer and the terminal portion of the core slider 13 are electrically connected using a gold ball 22.

FIG. 2A shows a configuration in which the width of the gimbal 12 is substantially equal to the width of the core slider 13, and FIG. 2B shows the width and length of the gimbal 12 more than the width and length of the core slider 13. A large configuration is shown.

That is, the gimbal 12 shown in FIG.
It has the area expansion part 12B. The area enlarging portion 12B is
It is used to bond the core slider 13. As the core slider 13 is downsized, the adhesive area is reduced. Therefore, by using the enlarged area portion 12B shown in FIG. 2 (B), not only the bottom surface of the core slider 13 but also the side surface thereof are bonded to each other, so that the bonding strength is increased.

As shown in FIG. 3, the core slider 1
The gimbal 12 on which the 3 is mounted is a spring arm 11
It is bent so that it has a certain angle (for example, 1.5 ° to 3.5 °). This is to make the core slider 13 parallel to the magnetic disk surface in the mounted state.

FIG. 4 is a lateral cross-sectional view of the suspension 10 shown in FIG. As described above, the wiring pattern 14 is provided on the spring arm 11. The wiring pattern 14 includes an insulating layer 24 provided on the spring arm 14, a plurality of conductive layers 25 provided thereon, and a protective layer 26 that protects the conductive layer 25. For the method of forming the wiring pattern 14, for example, Japanese Patent Laid-Open No.
For details, refer to JP-A-215513.

One end of the wiring pattern 14 serves as a terminal portion 19 as shown in FIG. The terminal portion 19 is obtained by bending one end of the wiring pattern 14 by 90 °. In the terminal portion 19, the conductive layer 25 is formed wide and is exposed. The terminal portion 19 is provided along the side surface 27 of the spacer 20.

The suspension 10 constructed in this way
Are attached to the spacer 20 by spot welding 18. As shown in FIG. 5, the spacer 20 is also provided with a positioning hole 17 (corresponding to the second positioning hole in the claims; the positioning hole of the spring arm corresponds to the first positioning hole in the claims).

The positioning hole 17 has a shape such as a perfect circle or an ellipse, and the spring arm 11 and the spacer 20 have the same diameter. At the time of spot welding, the spring arm 11 and the spacer 20 are overlapped, and a positioning rod (not shown)
Through the positioning hole 17. As a result, the two positioning holes completely overlap each other, and the spring arm 11 and the spacer 20 can be accurately positioned.

In the configuration shown in FIG. 1, the positioning hole 17 has one
However, two or more may be provided. In this case, a positioning rod is inserted into each positioning hole and spot welding is performed.

FIG. 6 is a view of the magnetic head support mechanism in the magnetic disk device as seen from below. FIG. 6 shows the relative positional relationship between the magnetic head support mechanism and the magnetic disk 30. When actually viewed from below, the magnetic disk 30 hides the core slider 13 and the like so that they cannot be seen. Alternatively, when the magnetic disk device has a plurality of magnetic disks, it may be considered that the magnetic disk 30 corresponds to the adjacent upper magnetic disk.

The spacer 20 is supported by the carriage arm 31 using the caulking hole 21. Carriage arm 3
1 is formed wider toward the spindle shaft 32.

The angle θ1 formed by the side surface 27 of the spacer 20 and the center line O of the magnetic head support mechanism is the same as the angle θ2 formed by the side surface 33 of the carriage arm 31 and the center line O (θ1 = θ2). This is intended to improve the efficiency of mounting and connecting the relay flexible wiring board (relay FRP) 34.

The relay FRP 34 includes the wiring pattern 14 and
This is to electrically connect to a flexible wiring board 35 extending from a signal processing circuit (not shown) inside the magnetic disk device. One end of the flexible wiring board 35 is a terminal portion 35A, which is fixed to the side surface of the carriage arm 31 (also referred to as the side surface of the spindle 32).

As described above, the terminal portion 1 of the wiring pattern
9 is formed along the side surface 27 of the spacer 20. Therefore, the orientation of the terminal portion 19 is the side surface 2 of the spacer 20.
7 and the side surface 33 of the carriage arm 31 in the same direction. Accordingly, the terminal portion 19 and the terminal portion 3 of the flexible wiring board 35 in the state where the relay FRP 34 is straightly extended.
5A can be connected.

Assuming that the terminal portion 19 and the flexible wiring board 3 are
If the terminal portion 35A of No. 5 is not in the same direction, the above connecting work must be performed in a state where the flexible wiring board 35 is bent (warped state), and workability is extremely poor. In addition, since the relay FRP 34 is in a straight state even after the connection, a high reliability can be obtained without applying an excessive stress to the connection portion with the terminal portions 19 and 35A.

Ultimately, the workability of this embodiment is improved by the terminal portion 19 and the terminal portion 35A of the flexible wiring board 35.
Should be on the same plane, and in order to realize this, θ1 = θ2 is set in the above embodiment. However,
The present invention is not limited to this realizing means, and includes other realizing means such that the terminal portion 19 and the terminal portion of the flexible wiring board 35 are located on the same plane.

In FIG. 6, reference numeral 36 is a coil, and 37 is a magnetic circuit. Further, the relay FRP 34 may be one that has been conventionally used. Further, in the above embodiment, the spacer 20
Although the carriage arm 31 and the carriage arm 31 are formed as separate members, they may be integrally formed. The integrally formed carriage arm has one continuous side surface, and the terminal portion 19 is provided along the side surface. Further, the carriage arm has a plurality of side surfaces facing the same angle on the same side, and the terminal portion 19 is provided along one of the side surfaces.

Here, as the size of the core slider 13 is reduced, it becomes an important problem how the characteristics of the suspension 10, particularly the resonance point and the rigidity, are set to desired values. According to an experiment by the present inventor, the root portion 11 of the spring arm 11 is
A width (root width) W1 (see FIG. 1) and gimbal 12
It was found that the resonance point and the rigidity of the suspension 10 can be effectively adjusted by adjusting the value of the width W2 (see FIG. 2) of the bridge portion 12A.

FIG. 7 is a graph showing changes in resonance point with respect to the root width W1 and changes in rigidity and resonance point with respect to the width W2 of the bridge portion 12A. In the figure, a resonance point 1 is a resonance point of torsional vibration, and a resonance point 2 is a resonance point of in-plane vibration. As for rigidity, vertical rigidity, roll rigidity, and pitch rigidity were measured. The suspension 10 used for the measurement has the configuration shown in FIG. 1, and the spring arm 11 is made of stainless steel.

Both resonance points 1 and 2 are preferably at frequencies as high as possible. In FIG. 7, the root width W1 = 2
Resonance points 1 and 2 have high frequencies near 10 mm (about 10 kHz)
z). Therefore, the range of the root width W1 may be set so that the range of the allowable resonance frequency is centered on the root width W1 at which the resonance points 1 and 2 substantially match. In the example of FIG. 7, it can be set in the range of 1.5 mm to 2.5 mm, for example.

The width W2 of the bridge portion 12A is set so that the change when each change in the stiffness and the resonance point 1 is normalized by a certain value is within a predetermined range. For example, in the example of FIG. 7, the width W2 can be set in the range of 0.5 mm to 0.7 mm.

In this way, the resonance points 1 and 2 can be set to desired values by adjusting the root width W1, and the rigidity can be set to desired values by adjusting the width W2.

The embodiments of the present invention have been described above. The present invention is not limited to the above embodiment, and various modifications are possible.

[0043]

As described above, according to the present invention, when the core slider is bonded to the gimbal, the adhesive can be provided not only on the bottom surface but also on the side surface of the core slider. Therefore,
The bonding area between the gimbal and the core slider can be increased, the gimbal and the core slider can be reliably fixed even if the core slider is downsized, and the reliability of the magnetic head support mechanism can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a magnetic head support mechanism according to an embodiment of the present invention.

FIG. 2 is an enlarged plan view showing the configuration near the gimbal of the embodiment shown in FIG.

FIG. 3 is an enlarged side view showing the configuration around the gimbal of the embodiment shown in FIG.

FIG. 4 is a cross-sectional view of a wiring pattern formed on a spring arm of the embodiment shown in FIG.

5 is a perspective view of the spacer of the embodiment shown in FIG. 1. FIG.

FIG. 6 is a view showing a mounted state of the magnetic head support mechanism shown in FIG. 1 from below.

7 is a diagram showing characteristics of the magnetic head support mechanism shown in FIG.

[Explanation of symbols]

10 suspension 11 spring arms 12 gimbal 12A bridge section 13 core slider 14 wiring pattern 15 Rib 16 slits 17 Positioning hole 18 spot welding 19 Terminal part 20 spacers 21 Caulking hole 27 sides 31 Carriage arm 33 side 34 Relay FRP 35 Flexible wiring board

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kaoru Abiko             5400 Omori, Higashine, Higashine, Higashine, Yamagata Prefecture             2 (No address) Yamagata Fujitsu Limited (72) Inventor Toru Shimozato             1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture             Within Fujitsu Limited (72) Inventor Katsumi Kiuchi             1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture             Within Fujitsu Limited (72) Inventor, Yushi Sasaki             1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture             Within Fujitsu Limited F-term (reference) 5D059 AA01 BA01 CA03 DA04 DA26                       EA02 EA03

Claims (2)

[Claims] 1. A magnetic head supporting mechanism having a suspension configured to support a core slider having a magnetic head bonded to a gimbal of a spring arm, wherein a width and a length of the gimbal are larger than a width and a length of the core slider. A magnetic head support mechanism characterized by being set. 2. A magnetic head support mechanism having a suspension configured to support a core slider having a magnetic head adhered to a gimbal of a spring arm, wherein an area is enlarged on a side portion of the gimbal where the core slider is disposed. A magnetic head support mechanism having a portion.