JP4089971B2 - Magnetic head suspension - Google Patents

Description

  The present invention relates to a suspension for supporting a magnetic head slider for reading and / or writing data to a storage medium such as a hard disk device.

The magnetic head suspension can move a magnetic head slider to be mounted in a seek direction (radial direction) on a storage medium such as a hard disk device.
Incidentally, with the recent development of mobile computers, it is desired to improve the impact resistance of the magnetic head suspension.
In order to meet such a demand, it is important to improve the limit acceleration of the magnetic head suspension when an impact is applied.
That is, in order to prevent the magnetic head slider from jumping and damaging the storage medium when an impact is applied to the magnetic head suspension, the inertial force applied to the magnetic head slider must be reduced.

  In this regard, for example, it has been proposed to increase the rigidity of the load beam portion by providing flanges at both edges in the width direction of the load beam while reducing the mass of the load beam portion by reducing the plate thickness. (See Patent Documents 1 and 2).

However, the means described in the prior art is to cover the rigidity deteriorated by reducing the mass of the load beam portion with the flange, and it is difficult to say that it is a fundamental solution for improving the limit acceleration. .
Japanese Patent Publication No.58-22827 U.S. Pat. No. 3,931,641

  The present invention has been made in view of such a conventional technique, and an object thereof is to provide a magnetic head suspension capable of drastically improving the limit acceleration.

As a result of intensive studies, the present inventor can drastically improve the limit acceleration of the magnetic head suspension by extending the load beam portion connected to the load bending portion and extending to the distal end side to the proximal end side. I got the idea that it might be.
That is, the load beam portion that has been conventionally extended only from the load bending portion to the distal end side is also extended to the proximal end side, and the load beam portion is related to the direction orthogonal to the storage surface of the storage medium. The idea was to give a rocking fulcrum.

FIG. 1 is a schematic diagram for explaining such an idea.
Reference numeral 210 in FIG. 1 denotes an arm constituting the base. Reference numerals 220 and 230 denote a load bending portion and a conventional load beam portion, respectively.
Then, with reference to a width direction line (Y axis) passing through the base end edge of the conventional load beam portion 230 (the connecting portion with the load bending portion 220), the rear extension portion 240 is provided to the conventional load beam portion 230. Was provided.

In such a schematic diagram, assuming that the arm 210 is a rigid body, (1) inertia force at the dimple position of the conventional load beam portion 230 with respect to the Y axis, and (2) the rear end of the rearward extending portion 240 The inertial force at the position was calculated, and the limit acceleration of the magnetic head suspension having the rearward extension 240 was calculated by subtracting (2) from (1).
In this calculation, the mass of the flexure part was ignored.
In the calculation, the plate thicknesses of the conventional load beam portion 230 and the rearward extension portion 240 were changed to 38 μm, 50 μm, and 76 μm.
The length of the rear extension 240 was 3.53 mm, 6.53 mm, and 8.53 mm.
Such a calculation result is shown in FIG.
As is apparent from FIG. 2, it is presumed that the limit acceleration of the magnetic head suspension is improved by providing the rearward extension 240.

  The present invention has been made based on the above idea, and specifically, a flexure portion having a magnetic head mounting area for supporting the magnetic head slider, and a load for pressing the magnetic head slider toward the storage surface of the storage medium. A magnetic head suspension having a load bending portion for generating the load, a load beam portion for transmitting the load to the magnetic head mounting region, and a base portion for supporting the load bending portion, wherein the first flat plate member, Provided is a magnetic head suspension including a two flat plate member and a third flat plate member.

In one embodiment, the first plate-like member is Ru is swingable about an axis of rotation perpendicular to the storage surface.
Before Stories second plate-like member includes a first a proximal region which is joined to the flat plate-like member, extending pieces base end area provided extending from the widthwise center toward the distal end, said extending pieces a pair of bending region extending distally from the proximal end section in the left and right both sides of the odor between the proximal region and the storage surface Te so as to extend substantially parallel to the storage surface, the pair of bending area a support a pair of front end regions possess integrally to, is intended thickness is thinner than the first plate-like member.
Before Symbol third plate member, wherein the wide central region wherein is joined to a pair of distal region of the second plate member, extending building the central region, respectively then the central region to the distal side and the proximal side The front end region and the base end region which are made narrower are integrally formed.
In this aspect, the base is formed by the first flat plate member, the load bending portion is formed by a bending region of the second flat plate member, and the load beam portion is the third flat plate member. Formed by.
The first flat plate member has an extended piece corresponding to the extended piece of the second flat plate member only at the center in the width direction, and the pair of bending regions in the second flat plate member. And it is comprised so that this 1st flat plate-shaped member may not exist above a pair of said front-end | tip area | region.
The extending piece of the second flat plate member is provided with a single convex portion that protrudes in a direction substantially perpendicular to the storage surface on the central longitudinal line of the magnetic head suspension.
The protrusions in a side view and engages Oite the third plate member in the vicinity of the boundary between the bending region and the distal region of the second plate-like member.

In another embodiment, the first plate-like member is Ru is swingable about an axis of rotation perpendicular to the storage surface.
Before Stories second plate-like member includes a first a proximal region which is joined to the flat plate-like member, extending pieces base end area provided extending from the widthwise center toward the distal end, said extending pieces A pair of bending regions extending from the proximal region to the distal side on both the left and right sides across the pair, a pair of proximal regions extending from the pair of bending regions to the distal side, and a pair of proximal regions extending from the proximal side to the distal side. integrally closed a distal region having a distal end for supporting the flexure portion, is assumed thin thickness than said first plate-like member.
Before Symbol third plate member has a wide central region that is joined to the pair of base end side of the distal end section of the second plate-like member, from the extended building the central region from the center region toward the proximal end A base end region having a narrow width is integrally formed.
In such another aspect, the base portion is formed by the first flat plate member, the load bending portion is formed by a bending region of the second flat plate member, and the load beam portion is the third flat plate shape. A member and a tip side of the tip region in the second flat plate member are formed.
An opening corresponding to the base end region of the third flat plate member is provided in the base end region of the first flat plate member and the second flat plate member.
The first flat plate member has an extended piece corresponding to the extended piece of the second flat plate member only at the center in the width direction, and the pair of bending regions in the second flat plate member. And it is comprised so that this 1st flat plate-shaped member may not exist above a pair of said front-end | tip area | region.
Wherein the said extending pieces of the second plate-like member, the convex portion of the single protruded toward a direction substantially orthogonal to the storage surface in the central longitudinal line of the magnetic head suspension is provided.
The protrusions in a side view and engages Oite the third plate member in the vicinity of the boundary between the bending region and the distal region of the second plate-like member.

Good Mashiku, based on the said projecting portion such that said load beam portion of the base end side of the distance B is 0.4 times to 1.6 times the tip side of the distance A, the second And a 3rd flat member can be formed.

In the various aspects, for example, the flexure portion may be formed by a member that forms a distal end side of the load beam portion.
Alternatively, the flexure portion can be formed by a member different from the member forming the load beam portion.

In the various aspects, for example, the first flat plate member may be a single arm whose base end portion can swing around the rotation axis and whose distal end portion supports the second flat plate member. .
Instead, the first flat plate member has an E block whose base end portion is swingable around the rotation axis, and is supported by the distal end portion of the E block and supports the second flat plate member. Mounts to be included.

According to the present invention, when an impact is applied, a moment in the same direction with respect to the vertical direction acts on both the distal end side and the proximal end side of the load beam portion with respect to the convex portion.
That is, paying attention to the magnetic head slider mounting portion, only the amount obtained by reducing the moment on the base end side of the load beam portion acts.
Therefore, the limit acceleration of the magnetic head slider mounting portion when an impact is applied can be improved, and the impact resistance can be drastically improved.
Furthermore, since the convex portion is formed on the extending piece of the second flat plate-like member so as to be positioned on the central longitudinal line of the magnetic head suspension, the convex portion can be easily formed.
Further, the first flat plate member has an extending piece corresponding to the extending piece of the second flat plate member only in the center in the width direction, and the pair of the second flat plate member Since the first flat plate member is configured not to exist above the bending region and the pair of tip regions, the first flat plate member is joined to the second flat plate member after joining the first flat plate member. The bending region can be bent without difficulty.
Furthermore, since the opening corresponding to the said base end area | region of the said 3rd flat plate member is provided in the said base end area | region of the said 1st flat plate member and the said 2nd flat plate member, the said 3rd flat plate member When the base end region of the third flat plate member is bent with the convex portion as a fulcrum, it is possible to effectively prevent the base end region of the third flat plate member from interfering with the first flat plate member 10 and the second flat plate member.

Embodiment 1
Hereinafter, a preferred embodiment of a magnetic head suspension according to the present invention will be described with reference to the accompanying drawings.
FIG. 3A is a top view of the magnetic head suspension 1A according to the present embodiment as viewed from the side opposite to the storage surface of a storage medium such as a hard disk. FIG. 3B is a cross-sectional view taken along line III-III in FIG.
FIG. 4 is an exploded top view showing the magnetic head suspension 1A shown in FIG. 3 for each component.

  As shown in FIG. 3, a magnetic head suspension 1A according to this embodiment includes a flexure unit 140 having a magnetic head mounting area that supports a magnetic head slider, and presses the magnetic head slider toward a storage surface of a storage medium. A load bending portion 120 that generates a load, a load beam portion 130 that transmits the load to the magnetic head mounting region, and a base portion 110 that supports the load bending portion 120 are provided.

In the magnetic head suspension 1A according to the present embodiment, the base portion 110, the load bending portion 120, and the load beam portion 130 are each formed of the following members.
That is, as shown in FIG. 4, the magnetic head suspension includes a first flat plate member 10, a second flat plate member 20 joined to the first flat plate member 10, and the second flat plate member 20. And a third flat plate member 30 to be joined.

The first flat plate member 10 is configured to be swingable about a rotation axis X orthogonal to the storage surface, and constitutes the base 110 in an assembled state (see FIG. 3). ).
The first flat plate member 10 is made of, for example, a stainless material having a plate thickness of 0.15 mm to 0.40 mm.
In the present embodiment, the first flat plate member 10 is formed in the form of an arm attached to the bearing of the voice coil motor. Instead, the first flat plate member 10 It is also possible to have an E block whose base end portion is swingable about the rotation axis X and a mount attached to the E block by caulking.

The second flat plate member 20 forms the load bending portion 120.
Specifically, the second flat plate member 20 includes a base end region 21 joined to a surface facing the memory surface of the first flat plate member 10 (hereinafter referred to as a counter surface), and the base end region 21. And the storage surface, a distal end region 23 extending substantially parallel to the storage surface and a bending region 22 connecting the proximal end region 21 and the distal end region 23 are integrally provided.
The bending region 22 of the second flat plate member 20 forms the load bending portion 120.
The second flat plate member 20 is made of, for example, a stainless material having a plate thickness of 0.03 mm to 0.06 mm.

The third flat plate member 30 forms the load beam portion 130.
Specifically, the third flat plate member 30 includes a central region 31 joined to the facing surface of the distal end region 23 of the second flat plate member 20, and from the central region 31 to the distal end side and the proximal end side. Each includes a distal end region 32 and a proximal end region 33 extending substantially parallel to the storage surface.
The third flat plate member 30 is formed of, for example, a stainless material of 0.03 mm to 0.15 mm.

Here, the load beam portion 130 in the magnetic head suspension 1A according to the present embodiment will be described in detail.
As described above, the third flat plate member 30 has a central region 31 joined to the second flat plate member 20 and a front end region 32 extending from the central region 31 to the front end side.
The central region 31 and the tip region 32 of the third flat plate member 30 have a load generated by the load bending portion 120 (the bent region 22 of the second flat plate member 20 in the present embodiment). Is transmitted to the magnetic head slider. That is, the central region 31 and the tip region 32 of the third flat plate member 30 constitute a conventional load beam portion.
The third flat plate member 30 includes the base region 33 extending from the central region 31 to the base side in addition to the above configuration. That is, in the magnetic head suspension 1A according to the present embodiment, the load beam portion 130 has a region extending from the load bending portion 120 to the base end side in addition to the conventional load beam portion.

As shown in FIG. 4, the magnetic head suspension 1A according to the present embodiment has a fourth flat plate shape in addition to the first flat plate member 10, the second flat plate member 20, and the third flat plate member 30. A member 40 is provided.
The fourth flat plate member 40 is configured to form the flexure portion 140.
The fourth flat plate member 40 is made of, for example, a stainless material having a plate thickness of 0.01 mm to 0.03 mm.
In the present embodiment, the flexure portion 140 is formed by a member (the fourth flat plate member 40) different from the third flat plate member 30 forming the load beam portion 130. Instead, the flexure part 140 may be formed by the tip region 32 of the third flat plate member 30.

In addition to the above configuration, the magnetic head suspension 1A according to the present embodiment has a distal end side and a proximal end side of the load beam portion 130 (that is, the distal end region 32 and the proximal end region 33 of the third flat plate member 30). ) Have a single or a plurality of convex portions 50 for allowing each to bend in a direction perpendicular to the storage surface.
In the present embodiment, the convex portion 50 is provided on at least one of the first flat plate member 10 or the second flat plate member 20.
As shown in FIG. 3B, the convex portion 50 is configured to abut on a surface (hereinafter referred to as a back surface) opposite to the storage surface of the third flat plate member 30.

The convex portion 50 is located in the vicinity of the boundary between the bent region 22 and the tip region 23 in the second flat plate member 20 in a side view.
That is, the convex portion 50 includes the load of the third flat plate member 30 when the first flat plate member 10, the second flat plate member 20, and the third flat plate member 30 are assembled. It is substantially positioned at a site where the pressing load is transmitted from the bending portion 120.
In the present embodiment, as shown in the figure, the convex portion 50 is single.
In the case of having such a single convex portion, the convex portion 50 is positioned on a central longitudinal line L connecting the rotation axis X and the center of the magnetic head slider in plan view.

Thus, in the magnetic head suspension 1A according to the present embodiment, the load beam portion 130 is added to the conventional load beam portion and the base end region 33 is provided, and the convex portion 50 is provided. Yes.
According to such a configuration, when an impact force in a direction perpendicular to the storage surface (hereinafter referred to as a vertical direction) is applied to the magnetic head suspension 1A, the tip region of the load beam portion 130 (third flat plate member 30) is applied. 32 and the proximal end region 33 both bend in the same vertical direction with the convex portion 50 as a fulcrum.
That is, when the impact force is applied, moments in the direction of canceling each other act on the distal end region 32 and the proximal end region 33 of the load beam portion 130 with the convex portion 50 as a fulcrum.

Accordingly, the inertial force applied to the magnetic head slider when the impact force is applied acts on the proximal end region 33 of the load beam portion 30 from the inertial force that acts on the distal end region 32 of the load beam portion 130. The value obtained by reducing the inertial force.
For this reason, in the magnetic head suspension 1A according to the present embodiment, the limit acceleration when the impact force is applied can be increased, and the impact resistance can be drastically improved.

Preferably, the load beam portion 130 is configured such that the base end side distance B is 0.4 to 1.6 times the tip end side distance A with respect to the convex portion 50. .
By providing such a configuration, the inertial force applied to the tip side of the load beam portion 130 can be greatly reduced.

In the illustrated embodiment, the convex portion 50 is integrally formed with the second flat plate member 20. This is because it is preferable to form the protrusions 50 on the second flat plate member 20 when the protrusions 50 are integrally formed because of the plate thickness.
Therefore, when the convex portion 50 is formed by a separate member, such a separate convex portion can be joined to either the first flat plate member 10 or the second flat plate member 20.

Further, the magnetic head suspension 1A according to the present embodiment has the following configuration in order to improve the assemblability while having the above-described features.
That is, as shown in FIG. 4, the proximal end region 21 of the second flat plate member 20 is provided with an extending piece 21 a extending toward the distal end side at the center in the width direction in plan view.
And the bending area | region 22 and the said front-end | tip area | region 23 of the said 2nd flat plate member 20 are each provided in a left-right symmetrical pair on both sides of the said extension piece 21a.

In addition, the first flat plate member 10 has a distal end region 11 joined to the proximal end region 21 of the second flat plate member 20 in the proximal end region 21 of the second flat plate member 20 in a plan view. It has a corresponding shape.
Specifically, the tip region 11 of the first flat plate member 10 has an extending piece 11a corresponding to the extending piece 21a in the second flat plate member 20 only in the center in the width direction in plan view. In addition, the first flat plate member 10 is configured not to exist above the pair of bending regions 22 and the pair of tip regions 23 in the second flat plate member 20.
The convex portion 50 is provided on the extending piece 21 a of the proximal end region 21 in the second flat plate member 20.

  According to such a configuration, the first to third flat plate members 10, 20, and 30 are joined while the second flat plate member 20 is die-cut and formed, and then the second flat plate member 20. The bending region 22 can be bent without difficulty. Therefore, the joining operation of the first to third flat plate members 10, 20, and 30 and the bending operation to the second flat plate member 20 can be efficiently performed.

Further, the third flat plate member 30 has the central region 31 having a wide shape, and the distal end region 32 and the base end region 33 each having a narrow shape that exists only at the substantially center in the width direction.
That is, as described above, in the present embodiment, the second flat plate-like member 20 has a pair of bending regions 22 and a pair of tip regions 23 located at both ends in the width direction.
Accordingly, the central region 31 joined to the pair of tip regions 23 of the second flat plate member 20 has a wide shape.
Further, the tip region 32 of the third flat plate member 30 has a substantially triangular shape in plan view that becomes narrower toward the tip in order to reduce the mass as much as possible while obtaining appropriate rigidity. .

As described above, in the present embodiment, the convex portion 50 is provided on the second flat plate member 20. Therefore, although the extending piece 21a is provided in the base end region 21 of the second flat plate member 20, when the convex portion 50 is provided in the first flat plate member 10, the second flat plate member Twenty extended pieces 21a can be dispensed with.
That is, the extending piece 11 a can be provided only on the first flat plate member 10, and the convex portion 50 can be provided on the extending piece 11 a of the first flat plate member 10.

Furthermore, in the present embodiment, the first flat plate member 10 and the second flat plate member 20 are each provided with a notch or opening 11b corresponding to the base end region 33 of the third flat plate member 30. 21b is provided (see FIGS. 3 and 4).
By providing such openings 11b and 21b, when the base end region 33 of the third flat plate member 30 is bent with the convex portion 50 as a fulcrum, the base end region 33 of the third flat plate member 30 is Interference with the first flat plate member 10 and the second flat plate member 20 can be effectively prevented.

Here, the impact resistance (limit acceleration) of the magnetic head suspension 1A according to the present embodiment will be described based on the finite element method analysis.
FIG. 5A shows only the load beam portion 130 and the load bending portion 120 of the magnetic head suspension (hereinafter referred to as an example) used in this analysis.

-Configuration of Example Material of first to fourth flat plate members 10 to 40 SUS304 (Young's modulus 19700 kgf / mm ² , density 8.03 × 10 ⁻⁶ kgf / mm ³ )
Plate thickness of first flat plate member 10 0.30 mm
Plate thickness of the second flat plate member 20 0.038 mm
Thickness of the fourth flat plate member 40 0.02 mm
Height of convex part 50mm
The tip width of the tip region 32 in the third flat plate member 30 W1 = 0.5 mm
The width of the proximal end of the distal end region 32 in the third flat plate member 30 W2 = 1.7 mm.
The width of the central region 31 in the third flat plate member 30 W3 = 4.4 mm
Width of the base end region 33 in the third flat plate member 30 W4 = 1.6 mm
The width of the bending region 22 in the second flat plate member 20 W5 = 0.5 mm
Distance between the convex portion 50 and the dimples formed on the third flat plate member 30 L1 = 7.25 mm
Distance between the convex portion 50 and the base end portion of the base end region 33 in the third flat plate member 30 L2 = 5.95 mm
Distance between rotation center X of first flat plate member 10 and convex portion 50 (see FIG. 3) L3 = 16 mm

FIG. 6 shows a schematic side view showing the conditions of this analysis.
As shown in FIG. 6, the support area including the rotation center X of the first flat plate member 10 was completely restrained. Further, in order to simulate the rigidity of the air bearing acting between the magnetic head slider 100 and the storage surface of the storage medium, a spring whose base end is connected to the magnetic head slider 100 and whose front end is in a completely restrained state. Element 180 was used.
Note that reference numeral 190 in FIG. 6 denotes a storage surface of the storage medium.
Then, with respect to the embodiment under such constraint conditions, a 2 msec sine half wave having a maximum value of 1 G is input to the constraint position, and the jump amount at the center of the magnetic head slider 100 is obtained by finite analysis. It was.
FIG. 7 shows the analysis result when the plate thickness of the third flat plate member 30 is 0.04 mm.

As a comparison object, the same analysis was performed on the conventional magnetic head suspension 200 (hereinafter referred to as a comparative example) shown in FIG.
The comparative example includes the proximal end region 33 of the third flat plate member 30, the extending pieces 11a and 21a in the first and second flat plate members 10 and 20, and the convex portion 50. Except for not doing so, the configuration was the same as in the previous example.
Similarly, the analysis result when the plate thickness of the load beam portion is 0.04 mm is also shown in FIG.
Moreover, the schematic diagram which shows the behavior of the said Example and the said comparative example when the said sine half wave is input is shown to Fig.8 (a) and (b).

  As shown in FIG. 8, in the embodiment, the base end region 33 of the third flat plate member 30 is bent in the vertical direction with the convex portion 50 as a fulcrum, thereby causing the magnetic head slider 100 to jump. The amount is decreasing (see FIG. 7).

Furthermore, based on the slider maximum jump amount shown in FIG. 7, the critical accelerations of the example and the comparative example were obtained.
Such an analysis was also conducted in the case where the plate thickness of the load beam portion 130 was set to 0.05 mm, 0.06 mm, and 0.07 mm in the examples and comparative examples.
FIG. 9 shows the relationship between the plate thickness of the load beam section 130 and the limit acceleration in the example and the comparative example.
As shown in FIG. 9, regardless of the plate thickness of the load beam portion 130, the limit acceleration in the example is improved as compared with the comparative example.

Embodiment 2
Hereinafter, another preferred embodiment of the magnetic head suspension according to the present invention will be described with reference to the accompanying drawings.
FIG. 10A is a top view of the magnetic head suspension 1B according to the present embodiment. FIG. 10B is a cross-sectional view taken along line XX in FIG.
Further, FIG. 11 is an exploded top view showing the magnetic head suspension 1B shown in FIG. 10 for each component.

In the magnetic head suspension 1B according to the present embodiment, the second flat plate member 20 and the third flat plate member 30 are the second flat plate member 20B and the third flat plate member 30B, respectively. Except for this, it is the same as the magnetic head suspension 1A according to the first embodiment.
Accordingly, the same or corresponding members as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

The second flat plate member 20B is different from the second flat plate member 20 of the first embodiment only in the tip region 24.
That is, the second flat plate member 20 </ b> B has the proximal end region 21, the bent region 22, and the distal end region 24.
The distal end region 24 of the second flat plate member 20B has a base end side 24a joined to the third flat plate member 30B, and a distal end side 24b extending forward to form a flexure portion 140 (in this embodiment, The fourth flat plate member 40) is configured to be supported.

The third flat plate member 30B has the same configuration as the third flat plate member 30 in the first embodiment except that the tip region 32 is not provided.
That is, the third flat plate member 30B includes a central region 31 joined to the proximal end side 24a of the distal end region 24 in the second flat plate member 20B, and the storage surface from the central region 31 to the proximal end side. Only the base end region 33 extending substantially in parallel is integrally provided.

That is, in the magnetic head suspension 1B according to the present embodiment, the load beam portion 130 is formed by the third flat plate member 30B and the tip side 24b of the tip region 24 of the second flat plate member 20B. It is considered as a divided structure.
More specifically, the central region 31 of the third flat plate member 30B forms the proximal end side of the load beam portion 130, and the distal end region 24 of the second flat plate member 20B is the load beam portion 130. The tip side is formed.

In the present embodiment, the thicknesses of the proximal end side and the distal end side of the load beam portion 130 can be set independently.
That is, the plate thickness of the second flat plate member 20B forming the distal end side of the load beam portion 130 is thinner than the plate thickness of the third flat plate member 30B forming the base end side of the load beam portion 130. can do.
Therefore, in the present embodiment, the same effect as in the first embodiment can be obtained, and the plate thickness on the tip side of the load beam portion 130 (tip region 24 of the second flat plate member 20B) can be reduced. The critical acceleration of the magnetic head slider mounting area can be improved.
Further, according to the configuration of the present embodiment, the connecting portion between the load bending portion 120 and the load beam portion 130 is formed by a single member (second flat plate member 20B). Therefore, the assembly accuracy can be improved.

In each of the above embodiments, the single convex portion 50 is used. However, the present invention is not limited to such an embodiment, and a plurality of convex portions 50 can be provided.
The plurality of convex portions 50 are positioned in the vicinity of the boundary between the bending region 22 and the tip region 23 or 24 in the second flat plate member 20 in a side view, and the central longitudinal line in a plan view. They are arranged symmetrically with respect to L.
When such a plurality of convex portions 50 are provided, it is possible to suppress deterioration of the natural mode in which the load beam portion 130 vibrates left and right with respect to the central longitudinal line L.

In each of the above embodiments, the convex portion 50 has a circular shape in plan view. Alternatively, the convex portion 50 may be a linear convex portion having a predetermined distance in the width direction of the magnetic head suspension in plan view. Is possible.
Such a linear convex portion is also located in the vicinity of the boundary between the bent region 22 and the tip region 23 in the second flat plate member 20 in a side view, and the central longitudinal line L is a reference in a plan view. Thus, the same effects as those obtained when the plurality of convex portions are provided can be obtained.

Furthermore, in each said embodiment, although the said convex part 50 was provided in the said 2nd flat plate-like member, it can replace with this and can also provide this convex part 50 in a said 3rd flat plate-like member.
In such an aspect, the convex portion 50 protrudes in a direction away from the storage surface so as to contact at least one of the first flat plate member 10 or the second flat plate member 20.

  In each of the above embodiments, stainless steel is exemplified as a material for forming the flexure portion 140, the load beam portion 130, the load bending portion 120, and the base portion 110. Of course, a metal containing iron, aluminum is used. It can be formed using various materials such as a metal containing, a metal containing titanium, or a ceramic.

FIG. 1 is a schematic diagram for explaining the concept of a magnetic head suspension according to the present invention. FIG. 2 is a graph showing the relationship between the plate thickness of the load beam portion and the limit acceleration based on the schematic diagram shown in FIG. FIG. 3A is a top view of the magnetic head suspension according to the first embodiment of the present invention. FIG. 3B is a cross-sectional view taken along line III-III in FIG. FIG. 4 is an exploded top view showing the magnetic head suspension 1A shown in FIG. 3 for each component. FIG. 5A is a top view showing an example (example) of the magnetic head suspension shown in FIG. 3, and shows only a load beam portion and a load bending portion. FIG. 5B is a top view showing an example (comparative example) of a conventional magnetic head suspension, and shows only a load beam portion and a load bending portion. FIG. 6 is a schematic side view showing analysis conditions performed using the example and the comparative example shown in FIG. FIG. 7 is a graph showing the analysis results under the analysis conditions shown in FIG. 6, and shows the relationship between time and slider jump amount. 8A and 8B are side views showing the behavior of the example and the comparative example shown in FIG. 5, respectively. FIG. 9 is a graph showing the relationship between the thickness of the load beam portion and the limit acceleration in the example and the comparative example shown in FIG. FIG. 10A is a top view of a magnetic head suspension according to the second embodiment of the present invention. FIG. 10B is a cross-sectional view taken along line XX in FIG. FIG. 11 is an exploded top view showing the magnetic head suspension shown in FIG. 10 for each component.

Explanation of symbols

1A, 1B Magnetic head suspension 10 First flat plate member 11 First flat plate member tip region 11a First flat plate member extension piece 20 Second flat plate member 21 Second flat plate member base end region 21a Second Extension piece 22 of flat plate member Bending region 23 of second flat plate member Third tip region 30 of third flat plate member 3rd flat plate member 31 Central region 32 of third flat plate member Tip region 33 of third flat plate member Base end region 50 of the third flat plate member Projection 110 Base 120 Load bending part 130 Load beam part 140 Flexure part L Center longitudinal line X Center of rotation

Claims (6)

A flexure portion having a magnetic head mounting area for supporting the magnetic head slider, a load bending section for generating a load for pressing the magnetic head slider toward a storage surface of a storage medium, and transmitting the load to the magnetic head mounting area A magnetic head suspension having a load beam portion and a base portion supporting the load bending portion,
A first flat plate member capable of swinging around a rotation axis orthogonal to the storage surface;
A proximal end region joined to the first flat plate member, the proximal end region provided with an extending piece extending from the center in the width direction to the distal end side, and the proximal end on both left and right sides sandwiching the extending piece a pair of bending region extending distally from the region, the odor between the proximal region and the storage surface Te so as to extend substantially parallel to the storage surface, a pair of tip region that is supported by the pair of bending area and the plate thickness thin second plate-like member than integrally closed, and the first plate-like member,
Wherein the wide central region wherein is joined to a pair of distal region of the second plate-like member, said central region narrower and have been the tip region and from the front end side and the proximal end side, respectively it extends building the central region from A third flat plate-like member integrally having a proximal end region ,
The base is formed by the first flat plate member,
The load bending portion is formed by a bending region of the second flat plate member,
The load beam portion is formed by the third flat plate member,
An opening corresponding to the base end region of the third flat plate member is provided in the base end region of the first flat plate member and the second flat plate member,
The first flat plate member has an extended piece corresponding to the extended piece of the second flat plate member only at the center in the width direction, and the pair of bending regions in the second flat plate member. And the first flat plate member does not exist above the pair of tip regions.
Wherein the said extending pieces of the second plate-like member, the convex portion of the single protruded toward a direction substantially orthogonal to the storage surface in the central longitudinal line of the magnetic head suspension is provided,
The protrusions in a side view, a magnetic head suspension which is characterized in that by engagement with Oite the third plate member in the vicinity of the boundary between the bending region and the distal region of the second plate-like member . A flexure portion having a magnetic head mounting area for supporting the magnetic head slider, a load bending section for generating a load for pressing the magnetic head slider toward a storage surface of a storage medium, and transmitting the load to the magnetic head mounting area A magnetic head suspension having a load beam portion and a base portion supporting the load bending portion,
A first flat plate member capable of swinging around a rotation axis orthogonal to the storage surface;
A proximal end region joined to the first flat plate member, the proximal end region provided with an extending piece extending from the center in the width direction to the distal end side, and the proximal end on both left and right sides sandwiching the extending piece A pair of bending regions extending from the region to the distal end side, a pair of proximal end sides extending from the pair of bending regions to the distal end side, and a distal end side extending from the pair of proximal end sides to the distal end side to support the flexure portion a distal region possess integrally, and the plate thickness thin second plate-like member than said first plate-like member,
A wide central region to be joined to the pair of base end side of the distal end section of the second plate member, and extending buildings the width than the central region narrower and radicals end region from the center region toward the proximal end A third flat plate-like member integrally having
The base is formed by the first flat plate member,
The load bending portion is formed by a bending region of the second flat plate member,
The load beam portion is formed by the third flat plate member and the tip side of the tip region of the second flat plate member,
An opening corresponding to the base end region of the third flat plate member is provided in the base end region of the first flat plate member and the second flat plate member,
The first flat plate member has an extended piece corresponding to the extended piece of the second flat plate member only at the center in the width direction, and the pair of bending regions in the second flat plate member. And the first flat plate member does not exist above the pair of tip regions.
Wherein the said extending pieces of the second plate-like member, the convex portion of the single protruded toward a direction substantially orthogonal to the storage surface in the central longitudinal line of the magnetic head suspension is provided,
The protrusions in a side view, a magnetic head suspension which is characterized in that by engagement with Oite the third plate member in the vicinity of the boundary between the bending region and the distal region of the second plate-like member . The load beam portion is configured such that the distance B on the proximal end side is 0.4 to 1.6 times the distance A on the distal end side with respect to the convex portion. The magnetic head suspension according to claim 1 or 2 . 4. The magnetic head suspension according to claim 1, wherein the flexure portion is formed by a member that forms the tip side of the load beam portion . The first flat plate member is characterized in that a base end portion is swingable about the rotation axis and a tip end portion is a single arm that supports the second flat plate member. The magnetic head suspension according to any one of 1 to 4 . The first flat plate member includes an E block whose base end portion is swingable about the rotation axis, and a mount that is supported by a distal end portion of the E block and supports the second flat plate member. 5. The magnetic head suspension according to claim 1 , wherein the magnetic head suspension is a magnetic head suspension.

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