JP2013016233A - Magnetic head suspension - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cause a resonance frequency of bending primary and secondary modes to rise without any mass increase.SOLUTION: A load beam part has a left pair of swelling regions at a boundary part of left and right pairs between a body part and a pair of flange parts. Each of the pair of swelling regions is located at a region sandwiched between an inner point located inward in a suspension width direction from a boundary line between the body part and the flange parts by a predetermined distance and an intermediate point between a base end part and a tip part of the flange parts, and molded by being pressed out to a side opposite to a disk surface with respect to the other part of the body part and the flange parts.

Description

  The present invention relates to a magnetic head suspension that supports a magnetic head slider that reads and / or writes data to a storage medium such as a hard disk.

  The magnetic head suspension that supports the magnetic head slider is required to position the magnetic head slider at the center of the target track at high speed and with high accuracy.

  That is, the magnetic head suspension is configured such that the base end side is swung directly or indirectly around the swing center by an actuator such as a voice coil motor so that the magnetic head slider supported on the front end side is parallel to the disk surface. It is a member for moving toward the target track along the seek direction.

In order to position the magnetic head slider on the target track at a high speed, it is necessary to increase the frequency of the drive signal of the actuator.
Therefore, in order to position the magnetic head slider on the target track at high speed and accurately, it is possible to cause resonance in the magnetic head suspension when the magnetic head suspension is swung around the swing center. It is desirable to prevent it.

Various vibration modes occur in the magnetic head slider. Among these, the bending primary mode and the bending secondary mode have resonance frequencies in the low frequency band.
Therefore, the primary bending mode and the secondary bending mode can be prevented so that resonance of the primary bending mode and the secondary bending mode occurs in the magnetic head suspension as much as possible even when the frequency of the drive signal of the actuator is increased. It is necessary to increase the resonance frequency.

The primary bending mode is the z direction in which the central portion of the load beam portion in the suspension longitudinal direction is orthogonal to the disk surface with the base end portion of the load bending portion (the portion connected to the support portion) and the dimples as fulcrums. It is a mode that vibrates.
The bending secondary mode is a portion of the support portion that is firmly fixed in the z direction (if the support portion is a base plate, it is a boss portion that is fixed to the carriage arm connected to the actuator via caulking. (Hereinafter, referred to as a support portion fixing position) and the support beam in a state where three points of a fulcrum are a base end side intermediate position between a suspension beam longitudinal center portion and a base end portion of the load beam portion and a dimple. A region between the portion fixing position and the base end side intermediate position (hereinafter referred to as a base end side region) vibrates in the z direction, and a region between the base end side intermediate position and the dimple is defined as the base end side region. Is a mode that vibrates in the z direction in a reverse phase state.

Increasing the resonance frequency of the bending primary mode and the bending secondary mode is achieved by increasing the rigidity of the load beam portion in the z direction.
In this regard, for example, the following Patent Document 1 includes a load beam portion including a main body portion extending in parallel with a disk surface and a pair of left and right flange portions provided on both sides of the main body portion in the suspension width direction. A load beam portion is disclosed in which an auxiliary flange portion is provided at substantially the center in the suspension width direction of the main body portion.

Although the load beam portion described in Patent Document 1 has the auxiliary flange portion in addition to the pair of flange portions, it is useful in that the rigidity in the z direction can be increased without causing an increase in mass. Since the auxiliary flange portion is provided at the center of the main body portion in the suspension width direction, it is difficult to fix the flexure portion to the main body portion (that is, to enable fixing to the main body portion). There is a problem that the flexure portion needs to have a complicated structure.
In addition, a damper member may be fixed to the main body portion as necessary and / or desired, but it is difficult to fix the damper member to the main body portion.

Japanese Patent Laid-Open No. 62-279570

  The present invention has been made in view of the prior art, and an object of the present invention is to provide a magnetic head suspension capable of increasing the resonance frequency of the bending primary mode and the bending secondary mode without causing an increase in mass.

  In order to achieve the above object, the present invention provides a support portion that is swung directly or indirectly by a actuator in a seek direction parallel to the disk surface around a rocking center, and a magnetic head slider is directed toward the disk surface. A load bending portion that generates a pressing load to be pressed; a load beam portion that is supported by the support portion via the load bending portion and that transmits the pressing load to the magnetic head slider; and the load beam portion and the support portion A magnetic head suspension including a flexure portion that is supported and has a head mounting region that supports the magnetic head slider on a front end side, wherein the load beam portion is a flat plate-like main body portion facing the disk surface; A pair of left and right flank bent from both outer ends in the suspension width direction of the main body to the opposite side of the disk surface A pair of left and right bulging regions are formed at a pair of left and right boundary portions between the main body portion and the pair of flange portions, and each of the pair of bulging regions includes the main body portion. And a region sandwiched between an inward point located inward in the suspension width direction by a predetermined distance from a boundary line between the corresponding flange portions and a corresponding intermediate point between the proximal end portion and the distal end portion of the flange portion. A magnetic head suspension is provided that is positioned and extruded to the opposite side of the disk surface with respect to the remaining area of the main body portion and the corresponding flange portion.

In one embodiment, each of the left and right boundary portions is positioned on the bulging area and on the distal end side and the proximal end side in the suspension longitudinal direction with the bulging area interposed therebetween, and the flange portion is located with respect to the main body portion. A distal-side non-bulged region and a proximal-side non-bulged region that are bent around the boundary line.
In this case, the bulging area protrudes in a direction close to the disk surface so as to come into contact with the back surface opposite to the support surface supporting the magnetic head slider in the head mounting area. It is arranged so as to straddle the center in the longitudinal direction of the suspension between the dimple formed in the portion and the base end portion of the load bending portion.

  A slit is provided between the bulging region and the distal-side non-bulging region and the proximal-side non-bulging region.

  In the configuration in which the slit is provided, the bulging region extends vertically from an inner point located inward by a predetermined distance from the suspension width direction outer end portion of the main body portion to the opposite side to the disk surface. An extension portion and a lateral extension portion that extends inward in the suspension width direction from an intermediate point between the base end portion and the tip end portion of the corresponding flange portion and is connected to the tip end of the longitudinal extension portion. obtain.

  Preferably, the longitudinally extending portion is parallel to the corresponding flange portion, and the laterally extending portion is parallel to the main body portion.

Instead of this, in the configuration in which the slit is provided, the bulging region is located at an inward position at a predetermined distance from an outer end portion in the suspension width direction of the main body portion and a proximal end of the flange portion. It may have an extension part that connects the intermediate point between the part and the tip part.
The extending portion may have a curved shape that is convex on the opposite side of the boundary line between the main body portion and the flange portion with reference to a virtual plane that connects the inward point and the intermediate point.
Alternatively, the extending portion may be a planar shape along a virtual plane connecting the inward point and the intermediate point.

It is also possible to configure the bulging region, the distal-side non-bulged region, and the proximal-side non-bulged region to be connected.
In this case, the bulging region includes an inward point positioned inward by a predetermined distance from an outer end portion in the suspension width direction of the main body portion and an intermediate point between the proximal end portion and the distal end portion of the flange portion. The extending portion is connected to the connecting portion, and the extending portion protrudes on the opposite side of the bending line between the main body portion and the flange portion with reference to a virtual plane connecting the inward point and the intermediate point. It may be a curved shape.
It can replace with this and it can also be made into the planar shape along the virtual surface which connects the said inward point and the said intermediate point to the said extension part.

Preferably, the main body includes a base end side portion in which a suspension width direction outer end portion approaches a suspension longitudinal center line at a first inclination angle as it goes from a base end side connected to the load bending portion to a distal end side. A distal end portion that is close to the suspension longitudinal center line at a second inclination angle that is smaller than the first inclination angle from the outer end portion in the suspension width direction as it goes from the proximal end side to the distal end side that is connected to the proximal end portion; Can be included.
In this case, the bulging region is arranged so as to straddle the boundary between the proximal end portion and the distal end portion in the suspension longitudinal direction.

According to the magnetic head suspension of the present invention, the pair of left and right bulging regions are provided at the pair of left and right boundary portions between the main body portion of the load beam portion and the pair of flange portions, and the pair of bulging regions Each of the intermediate portion between the base end portion and the tip end portion of the flange portion corresponding to an inward point located inward in the suspension width direction by a predetermined distance from a boundary line between the main body portion and the corresponding flange portion. Is positioned in a region sandwiched between points, and is extruded to the opposite side of the disk surface with respect to the remaining region of the main body portion and the corresponding flange portion, so that the bending rigidity can be increased without causing an increase in mass. It is possible to effectively improve the resonance frequency of the bending primary mode and the bending secondary mode.
Further, since a free space can be secured at the center of the main body portion in the suspension width direction, the adherence to the flexure portion and the damper member to the main body portion is not impaired.

FIG. 1 is a top view of the magnetic head suspension according to the first embodiment of the present invention. FIG. 2 is a bottom view of the magnetic head suspension according to the first embodiment. FIG. 3 is an enlarged view of a portion III in FIG. 4A and 4B are cross-sectional views taken along lines IV (a) -IV (a) and IV (b) -IV (b) in FIG. 3, respectively. FIG. 5 is a process schematic diagram of an example of a method of manufacturing a load beam portion in the magnetic head suspension according to the first embodiment. FIG. 6 is a process schematic diagram of another example of the method for manufacturing the load beam portion, and shows a method for manufacturing the distal-side non-bulged region and the proximal-side non-bulged region. FIG. 7 is a process schematic diagram of another example of the method for manufacturing the load beam portion, and shows a method for manufacturing the bulging region. FIG. 8 is a graph showing an analysis result regarding the resonance frequency of the primary bending mode and the secondary bending mode performed for Example 1 and Comparative Example 1. FIG. 9 is a top view of the magnetic head suspension according to the second embodiment of the present invention. FIG. 10 is a bottom view of the magnetic head suspension according to the second embodiment. FIG. 11 is an enlarged view of a portion XI in FIG. 12A and 12B are cross-sectional views taken along lines XII (a) -XII (a) and XII (b) -XII (b) in FIG. 11, respectively. FIG. 13 is a graph showing an analysis result regarding the resonance frequency of the primary bending mode and the secondary bending mode performed on Example 2 and Comparative Example 2. FIG. 14 is a top view of the magnetic head suspension according to the third embodiment of the present invention. 15 is a cross-sectional view taken along line XV-XV in FIG. FIG. 16 is a cross-sectional view of a load beam portion of a magnetic head suspension according to a modification of the third embodiment, and shows a cross section corresponding to FIG.

Embodiment 1
Hereinafter, preferred embodiments of a magnetic head suspension according to the present invention will be described with reference to the accompanying drawings.
1 and 2 are a top view (a plan view seen from the side opposite to the disk surface) and a bottom view (a bottom view seen from the disk surface) of the magnetic head suspension 1A according to the present embodiment, respectively. .
In addition, (circle) in FIG. 2 has shown the welding point.

  As shown in FIGS. 1 and 2, the magnetic head suspension 1A is swung directly or indirectly in a seek direction parallel to the disk surface around a swing center by an actuator (not shown) such as a voice coil motor. Supporting portion 10, a load bending portion 20 connected to the supporting portion 10 so as to generate a load for pressing the magnetic head slider 50 toward the disk surface, and the load bending portion 20 through the load bending portion 20. A load beam portion 30A supported by the support portion 10 and transmitting the load to the magnetic head slider 50, and a flexure portion supported by the load beam portion 30A and the support portion 10 while supporting the magnetic head slider 50. 40.

  The support portion 10 is a member that supports the load beam portion 30A via the load bending portion 20 while being directly or indirectly connected to the actuator, and has a relatively high rigidity.

In the present embodiment, as shown in FIGS. 1 and 2, the support portion 10 includes a boss portion 15 joined by caulking to the tip of a carriage arm (not shown) connected to the actuator. The base plate.
The support part 10 is preferably formed by a stainless plate having a thickness of 0.1 mm to 0.8 mm, for example.
As a matter of course, an arm whose base end portion is connected to the swing center of the actuator can be adopted as the support portion 10.

  As described above, the load beam portion 30A is a member for transmitting the load generated by the load bending portion 20 to the magnetic head slider 50, and therefore requires a predetermined rigidity.

  As shown in FIGS. 1 and 2, the load beam portion 30A includes a flat plate-like main body portion 31A facing the disk surface, and extends from the both ends of the main body portion 31A in the suspension width direction to the opposite side of the disk surface. A pair of left and right flange portions 32 is provided, and the flange portion 32 improves the rigidity.

Further, the load beam portion 30 </ b> A is provided with a pair of left and right bulging regions 35 at the left and right boundary portions between the main body portion 31 </ b> A and the pair of flange portions 32.
Details of the bulging area 35 will be described later.
The load beam portion 30A is preferably formed by a stainless plate having a thickness of 0.02 mm to 0.1 mm, for example.

As shown in FIG. 1, a projection 33 called a so-called dimple is formed on the distal end side of the main body 31A.
The protrusion 33 protrudes, for example, about 0.05 mm to 0.1 mm in a direction close to the disk surface. The protrusion 33 contacts the upper surface of the following head mounting area 415 in the flexure section 40 (the back surface opposite to the support surface that supports the magnetic head slider), and the load transmits the flexure through the protrusion 33. The information is transmitted to the head mounting area 415 of the unit 40.

  In the present embodiment, as shown in FIGS. 1 and 2, the load beam portion 30 </ b> A further includes a lift tab 34 that extends from the distal end of the main body portion 31 toward the distal end side in the suspension longitudinal direction. . The lift tab 34 engages with a ramp provided in the magnetic disk device when the magnetic head suspension 1A is swung by the actuator so that the magnetic head slider 50 is positioned radially outward of the disk surface. The magnetic head slider 50 is a member for separating the magnetic head slider 50 from the disk surface along the z direction orthogonal to the disk surface.

In the present embodiment, as shown in FIGS. 1 and 2, both end portions in the suspension width direction of the main body 31A of the load beam portion 30A extend in the suspension longitudinal direction from the suspension longitudinal direction proximal end side to the distal end side. It is tapered in plan view so as to be close to the center line CL.
According to such a configuration, it is possible to reduce the moment of inertia around the center line CL on the tip end side of the load beam portion 30A, and among various vibration modes, the torsion around the torsion center line, particularly along the suspension longitudinal direction center line. The resonance frequency of the torsional mode can be increased.

In the present embodiment, the load bending portion 20 has a pair of left and right leaf springs 21.
As shown in FIGS. 1 and 2, the pair of left and right leaf springs 21 are connected to the support portion 10 at the base end portion and separated from the load beam in a state of being separated from each other in the suspension width direction. It is connected to the part 30A.
The pair of left and right leaf springs 21 are bent in advance in a direction between the base end portion and the tip end portion in the direction in which the tip end approaches the disk surface around a load bending line (not shown) along the suspension width direction. Then, a pressing load for pressing the magnetic head slider 50 toward the disk surface is generated based on elastic deformation in the bending back direction.

The pair of leaf springs 21 is formed of, for example, a stainless steel plate having a thickness of 0.02 mm to 0.1 mm.
In the present embodiment, the pair of leaf springs 21 are integrally formed with a load beam forming member 300 that forms the load beam portion 30A.
Specifically, in the present embodiment, as shown in FIGS. 1 and 2, the load beam portion forming member 300 includes a load beam forming region 301 for forming the load beam portion 30A, and the load beam forming region 301. A leaf spring forming region 305 extending from the base end side to the base end side, and the leaf spring forming region 305 forms the pair of left and right leaf springs 21 by providing a gap at the center in the suspension width direction. Yes.

  The flexure portion 40 is fixed to the load beam portion 30A and the support portion 10 by welding or the like while supporting the magnetic head slider 50.

Specifically, as shown in FIG. 2, the flexure unit 40 has a flexure metal plate 410.
As shown in FIG. 2, the flexure metal plate 410 includes a support portion fixing region 411 fixed to the support portion 10 by welding or the like, and a load beam portion fixing region 412 fixed to the load beam portion 30A by welding or the like. And a pair of support pieces 413 (see FIG. 1) extending from both sides in the suspension width direction at the tip end portion of the load beam portion fixing region 412 to the tip end side in the suspension longitudinal direction, and the head mounting supported by the pair of support pieces 413. And a region 415.

The head mounting area 415 supports the magnetic head slider 50 on the lower surface facing the disk surface.
As described above, the protrusion 33 is in contact with the upper surface of the head mounting area 415. Therefore, the head mounting area 415 can swing flexibly in the roll direction and the pitch direction with the protrusion 33 as a fulcrum. It has become.

The flexure metal plate 410 has a lower rigidity than the load beam portion 30A so that the head mounting region 415 can swing in the roll direction and the pitch direction.
The flexure metal plate 410 is, for example, a stainless steel plate having a thickness of about 0.01 mm to 0.025 mm.

  Preferably, the flexure section 40 is integrally provided with a wiring structure 420 for electrically connecting the magnetic head slider 50 to an external member, as shown in FIG.

Specifically, the wiring structure 420 includes an insulating layer stacked on a lower surface of the flexure metal plate 410 facing the disk surface and a signal wiring stacked on a surface of the insulating layer facing the disk surface. obtain.
Preferably, the wiring structure may have an insulating cover layer surrounding the signal wiring.

Here, the pair of left and right bulging regions 35 provided in the load beam portion 30A will be described.
FIG. 3 shows an enlarged view of part III in FIG.
4A and 4B are sectional views taken along lines IV (a) -IV (a) and IV (b) -IV (b) in FIG. 3, respectively.

  As shown in FIGS. 1, 3, 4 (a) and 4 (b), the pair of left and right bulging regions 35 are formed of a pair of left and right between the main body portion 31 A and the pair of flange portions 32. It is provided at the boundary.

  Specifically, as shown in FIG. 4 (b), each of the pair of left and right bulging regions 35 is within a suspension width direction by a predetermined distance from a boundary line 32L between the main body portion 31A and the corresponding flange portion 32. Is located in a region sandwiched by the inner point 310 located on the opposite side and the intermediate point 320 between the proximal end portion and the distal end portion of the flange portion 32 corresponding to the inner point 310, and the body portion 31 </ b> A and the corresponding flange portion 32. The remaining area is extruded to the opposite side of the disk surface.

  By providing the bulging region 35, the resonance frequency of the bending primary mode and the bending secondary mode of the magnetic head suspension 1A existing in a relatively low frequency band can be increased.

  That is, the primary bending mode is a state between the two fulcrums in a state where the base end portion of the load bending portion 20 (the portion of the load bending portion 20 connected to the support portion 10) and the dimple 33 are fulcrums. This region is a vibration mode in which the region oscillates in the z direction.

  The bending secondary mode is a portion of the support portion 10 that is firmly fixed in the z direction (if the support portion 10 is a base plate, the support portion 10 is fixed to a carriage arm connected to an actuator via caulking. 3 points of the tip end side position of the boss portion 15 (hereinafter referred to as the support portion fixing position), the base end side intermediate position between the suspension longitudinal direction central portion and the base end portion in the load beam portion 30A, and the dimple 33. With the fulcrum as a fulcrum, a region between the support portion fixing position and the base end side intermediate position (hereinafter referred to as a base end side region) vibrates in the z direction and between the base end side intermediate position and the dimple. Is a vibration mode that vibrates in the z direction in a phase opposite to that of the base end side region.

A conventional load beam portion having no bulging area 35 has a cross-sectional shape as shown in FIG.
That is, in the conventional load beam portion, there is only one bending portion that is bent around the bending line along the suspension longitudinal direction over the entire suspension longitudinal direction.

  On the other hand, in the bulging region of the load beam portion in the present embodiment, there are three bending portions that are bent around the bending line along the suspension longitudinal direction.

  Specifically, as shown in FIGS. 3 and 4 (b), in the present embodiment, the bulging region 35 is positioned inward by a predetermined distance from the outer end in the suspension width direction of the main body 31A. Further, a longitudinally extending portion 351 extending from the inner point 310 to the opposite side of the disk surface, and an intermediate point 320 located on the distal end side by a predetermined distance from the base end portion of the flange portion 32, the suspension width direction inner side. And a laterally extending portion 352 connected to the tip of the vertically extending portion 351.

  In the bulging region 35 having such a configuration, the first bending portion located between the main body portion 31A and the longitudinally extending portion 351, and between the longitudinally extending portion 351 and the laterally extending portion 352 are provided. There are three bent portions, that is, a second bent portion positioned and a third bent portion positioned between the laterally extending portion and the flange portion 32.

Here, the rigidity for the primary bending mode and the secondary bending mode in which the region between the two points separated in the longitudinal direction of the suspension vibrates in the z-direction is the number of the bending portions. The more you increase, the higher it becomes.
Therefore, the load beam portion 30A having the three bent portions in the bulging region 35 does not increase the mass, and the bending portion is compared with the conventional configuration in which the bent portion is one. The rigidity with respect to the primary mode and the bending secondary mode can be increased.

Further, since the pair of bulging areas 35 are provided at the boundary portion between the main body portion 31A and the pair of flange portions 32, a free space is secured at the center in the suspension width direction of the main body portion 31A. be able to.
Therefore, the fixing property of the flexure portion 40 and the damper member provided as necessary or desired to the main body portion 31A is not impaired.

  In the present embodiment, the bulging region 35 is provided only in the middle in the suspension longitudinal direction of the load beam portion 30A.

  That is, as shown in FIGS. 1 and 3, each of the left and right boundary portions is located on the bulging region 35 and on the distal end side and the proximal end side in the suspension longitudinal direction with the bulging region 35 interposed therebetween, respectively. The flange portion 32 includes a distal-side non-bulged region 36 and a proximal-side non-bulged region 37 that are bent around the boundary line 32L with respect to the main body portion 31A.

  Thus, when the bulging area 35 is provided only in the middle in the suspension longitudinal direction of the load beam portion 30A, the bulging area 35 is preferably formed when the magnetic head suspension 1A vibrates in a bending mode. Is provided at a portion where the amount of displacement in the z direction is the largest.

In consideration of this point, in the present embodiment, the bulging region 35 is disposed so as to straddle the suspension longitudinal direction center between the base end portion of the load bending portion 20 and the dimple 33.
According to such a configuration, it is possible to efficiently improve the rigidity with respect to the bending primary mode while reducing the range in which the bulging region 35 is formed as much as possible.

As shown in FIG. 3, in the present embodiment, slits 36a and 37a are provided between the bulging area 35 and the distal-side non-bulging area 36 and the proximal-side non-bulging area 36, respectively. It has been.
By providing the slits 36a and 37a, it is possible to prevent the flange portion 32 from being deformed as a result of the formation of the bulging region 35 as much as possible.

  As shown in FIG. 5, the load beam portion 30A having such a configuration is formed on the both sides of the suspension 31 in the suspension width direction of the main body portion 31A using the flange upper die 151 and the flange lower die 152. A step of forming the pair of flange portions 32 extending, and a bulging upper die 161 and a bulging lower die only for a region of the pair of flange portions 32 where the bulging region 35 is to be formed. And a step of forming the pair of bulging regions 35 by acting 162.

  Instead, the pair of flanges 32 is formed in the distal end non-bulged region 36 and the proximal end non-bulged region 37 by using the flange upper mold 151 and the flange lower mold 152. And the step of forming the bulging region 35 and the pair of flanges 32 using the bulging upper mold 161 and the bulging lower mold 162 (see FIG. 7). Can be performed simultaneously.

  Preferably, the longitudinally extending portion 351 can be parallel to the flange portion 32 (β2 = β1 in FIG. 4A), and the laterally extending portion 352 can be parallel to the main body portion 31A. .

  According to such a preferable configuration, the amount of spring back of the bulging region 35 with respect to the main body portion 31A during bending can be made the same as the amount of spring back of the flange portion 32 with respect to the main body portion 31A. It is possible to effectively prevent the bulging region from being deformed with respect to the desired shape.

Here, an analysis result performed on an example of the magnetic head suspension according to the present embodiment (hereinafter referred to as Example 1) will be described.
In this analysis, the resonance frequencies of the bending primary mode and the bending secondary mode of Example 1 were obtained by eigenvalue analysis using a finite element method.
In addition, the said Example 1 shall have the following dimension (refer FIG.1 and FIG.4).
The results of this analysis are shown in FIG.

Material of support 10: SUS304
Support part 10 thickness: 0.15 mm
Material of load beam section 30: SUS304
Load beam 30 thickness: 0.03 mm
Suspension longitudinal direction distance L0 from the reference part of the support part 10 to the dimple 33: 11 mm
Suspension longitudinal distance L1: 4.8 mm between the reference portion and the tip of the support portion 10
Suspension longitudinal distance L2 of the pair of leaf springs 21: 0.5 mm
Width W of the base end portion of the load beam portion 30: 3.8 mm
Inclination angle α with respect to the suspension longitudinal center line CL of the suspension width direction outer end portion of the main body 31A: 14 °
Suspension longitudinal direction distance L3 of the base end side non-bulged region 37: 1.57 mm
Suspension longitudinal distance L4 of the bulging region 35: 3.0 mm
Angle β of flange portion 32: 75 °
Flange 32 height H1: 0.31 mm
Height H2 of the bulging area 35: 0.125 mm
Distance D between the boundary 32L of the flange 32 and the main body 31A and the inner end 35 of the bulging region 35 in the suspension width direction: 0.15 mm
Angle β2 of the longitudinally extending portion 351: 75 °

The resonance frequency of the bending primary mode and the bending secondary mode of Comparative Example 1 having the same configuration as that of Example 1 except that the bulging region 35 is not provided was obtained by the same method.
The results are also shown in FIG.

As apparent from FIG. 8, the first embodiment in which the bulging region 35 is formed has both a bending primary mode and a bending secondary mode as compared with the comparative example 1 having no bulging region 35. Has a high resonance frequency.
This is because the frequency of the drive signal of an actuator such as a voice coil motor is increased in the first embodiment in order to move the magnetic head slider 50 onto a target track at a higher speed than in the first comparative example. This means that the occurrence of resonance can be prevented.

Embodiment 2
Hereinafter, another embodiment of a magnetic head suspension according to the present invention will be described with reference to the accompanying drawings.
9 and 10 are a top view (a plan view seen from the side opposite to the disk surface) and a side view, respectively, of the magnetic head suspension 1B according to the present embodiment.
FIG. 11 is an enlarged view of the XI part in FIG.
Further, FIGS. 12A and 12B are sectional views taken along lines XII (a) -XII (a) and XII (b) -XII (b) in FIG. 11, respectively.
In the figure, the same members in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the magnetic head suspension 1A according to the first embodiment, the outer end portion of the main body 31A in the suspension width direction is inclined with respect to the suspension longitudinal center line CL at a substantially constant angle.

  On the other hand, in the magnetic head suspension according to the present embodiment, the suspension beam width direction outer end portion of the main body portion 31B of the load beam portion 30B has a first inclination angle α1 on the base end side and the suspension longitudinal direction center line CL. And at the front end side is inclined with respect to the suspension longitudinal center line CL at a second inclination angle α2 smaller than the first inclination angle α1.

  Specifically, the magnetic head suspension 1B according to the present embodiment is different from the magnetic head suspension 1A according to the first embodiment only in that the load beam portion 30A is changed to the load beam portion 30B. ing.

  The load beam portion 30B has a flat plate-like main body portion 31B facing the disk surface, the pair of flange portions 32, and the pair of bulging regions 35.

  As shown in FIG. 9, the main body portion 31 </ b> B has a proximal end portion 361 connected to the load bending portion 20 and a distal end portion 362 extending from the proximal end portion 361 to the distal end side. .

The base end side portion 361 is configured such that the outer end portion in the suspension width direction approaches the suspension longitudinal center line CL at the first inclination angle α1 as it goes from the base end side to the tip end side.
The distal end side portion 362 is configured to approach the suspension longitudinal center line CL at a second inclination angle α2 smaller than the first inclination angle α1 from the outer end portion in the suspension width direction from the proximal end side toward the distal end side. ing.
According to such a configuration, it is possible to increase the resonance frequency of the torsion mode and effectively prevent the resonance of the torsion mode.

  As in the present embodiment, the inclination angle of the outer end portion in the suspension width direction of the main body portion 31B with respect to the suspension longitudinal center line CL is an inflection point 360 (the boundary between the base end portion 361 and the tip end portion 362). In the configuration that changes, the bulging region 35 is preferably disposed so as to straddle the boundary between the proximal end side portion 361 and the distal end side portion 362 in the suspension longitudinal direction.

  According to such a configuration, the bending rigidity at the inflection point 360 can be increased, and the occurrence of resonance in the bending primary mode and the bending secondary mode can be effectively prevented.

Here, an analysis result performed on an example of the magnetic head suspension according to the present embodiment (hereinafter referred to as Example 2) will be described.
Also in this analysis, the resonance frequencies of the primary bending mode and the secondary bending mode of Example 2 were obtained by eigenvalue analysis using the finite element method.
In addition, the said Example 2 shall have the same dimension as the said Example 1 except the following dimension.
The results of this analysis are shown in FIG.

Suspension longitudinal direction distance L5 from the base end portion of the load beam portion 30B to the inflection point 360: 3.5 mm
Inclination angle α1: 21.3 ° with respect to the suspension longitudinal center line CL of the suspension width direction outer end portion of the base end side portion 361
Inclination angle α1: 6.0 ° with respect to the suspension longitudinal center line CL at the suspension width direction outer end portion of the distal end side portion 362

The resonance frequency of the bending primary mode and the bending secondary mode of Comparative Example 2 having the same configuration as that of Example 2 except that the bulging area 35 is not provided was also obtained by the same method.
The results are also shown in FIG.

As apparent from FIG. 13, the second embodiment in which the bulging region 35 is formed has both a bending primary mode and a bending second mode compared to the comparative example 2 that does not have the bulging region 35. Has a high resonance frequency.
This is because the frequency of the drive signal of an actuator such as a voice coil motor is increased in the second embodiment in order to move the magnetic head slider 50 onto the target track at a higher speed than in the second comparative example. This means that the occurrence of resonance can be prevented.

Embodiment 3
Hereinafter, another embodiment of a magnetic head suspension according to the present invention will be described with reference to the accompanying drawings.
FIG. 14 shows a top view (a plan view seen from the side opposite to the disk surface) of the magnetic head suspension 1C according to the present embodiment.
FIG. 15 is a sectional view taken along line XV-XV in FIG.
In the drawing, the same members in the first or second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The magnetic head suspension 1C according to the present embodiment is different from the magnetic head suspension 1B according to the second embodiment in the specific structure of the bulging region 35C.

  Specifically, the magnetic head suspension 1C according to the present embodiment has a load beam portion 30C instead of the load beam portion 30B in the magnetic head suspension 1B according to the second embodiment.

  In the load beam portion 30B according to the second embodiment, the slits 36a, 37a (37a ( 11) is provided.

  On the other hand, in the load beam portion 30C in the present embodiment, the slits 36a and 37a are omitted, and the bulging region 35C is formed by the distal end side non-bulging region 36 and the proximal end side non-bulging. It is connected to the region 37.

  In order to allow the bulging area 35C to bulge to the side opposite to the disk surface while being connected to the distal-side non-bulging area 36 and the proximal-side non-bulging area 37 In this form, as shown in FIG. 15, the bulging area 35C has an inner point 310 located inward from the outer end in the suspension width direction of the main body 31B and a base of the flange 32. An extension portion 355 connecting the end portion and the intermediate point 320 between the end portions, and the extension portion 355 is based on a virtual plane connecting the inward point 310 and the intermediate point 320. It has a curved shape that is convex on the side opposite to the boundary line 32L between the main body portion 31B and the flange portion 32.

  Thus, by connecting the bulging region 35C to the distal-side non-bulging region 36 and the proximal-side non-bulging region 37, the rigidity of the load beam portion 30C is determined by the presence of the slits 36a and 37a. Can be prevented from deteriorating.

  Further, in the present embodiment, since the developed length of the bulging region 35C can be made shorter than the developed length of the bulging region 35, the rigidity against the torsion mode that twists around the torsion center line along the suspension longitudinal direction. Can be increased.

As shown in FIG. 16, the bulging region 35C has a planar extending portion 355 ′ along the virtual plane connecting the inward point 310 and the intermediate point 320, instead of the extending portion 355. It can also be configured to have.
In this case, the rigidity with respect to the torsion mode can be further improved.

In the present embodiment, as shown in FIG. 14, the bulging region 35C is provided in the distal end portion 362 on the distal end side from the inflection point 360, and the resonance frequency of the bending secondary mode The effective improvement of is aimed at.
Of course, it is also possible to arrange the bulging region 35C so as to straddle the inflection point 360 in the suspension longitudinal direction.

  In the first and second embodiments in which the slits 36a and 37a are provided, the bulging area 35C can be applied instead of the bulging area 35.

1A to 1C Magnetic head suspension 10 Support part 20 Load bending part 30A to 30C Load beam part 31A, 31B Main body part 32 Flange part 33 Dimple 35, 35C Swelling area 36 Tip side non-swelling area 36a Slit 37 Base end side non-swelling Exit area 37a Slit 40 Flexure part 50 Magnetic head slider 310 Inner point 320 Intermediate point 351 Vertically extending part 352 Horizontally extending part 355 Extending part 360 Boundary 361 between base end part and tip end part 361 Base end part 362 Tip Side part 415 Head mounting area

Claims (10)

A support portion that is swung directly or indirectly around a swing center by an actuator in a seek direction parallel to the disk surface; a load bending portion that generates a pressing load that presses the magnetic head slider toward the disk surface; A load beam portion supported by the support portion via a load bending portion and transmitting the pressing load to the magnetic head slider, supported by the load beam portion and the support portion, and supported by the tip side. A magnetic head suspension including a flexure portion having a head mounting area to perform,
The load beam portion includes a flat plate-like main body portion facing the disk surface, and a pair of left and right flange portions bent from the both outer ends of the main body portion in the suspension width direction to the opposite side of the disk surface. A pair of left and right bulging regions are formed at a pair of left and right boundary portions between the main body portion and the pair of flange portions,
Each of the pair of bulging regions includes a base end portion of the flange portion corresponding to an inward point positioned inward in the suspension width direction by a predetermined distance from a boundary line between the main body portion and the corresponding flange portion, and It is located in a region sandwiched by an intermediate point between the tip portions, and is extruded to the opposite side of the disk surface with respect to the remaining region of the main body portion and the corresponding flange portion. Magnetic head suspension. The main body is formed with dimples protruding in a direction close to the disk surface so as to contact the back surface opposite to the support surface that supports the magnetic head slider in the head mounting area,
Each of the left and right boundary portions is located on the bulging region and on the distal end side and the proximal end side in the suspension longitudinal direction with the bulging region in between, and the flange portion is around the boundary line with respect to the main body portion. A distal-side non-bulged region and a proximal-side non-bulged region that are bent into
2. The magnetic head suspension according to claim 1, wherein the bulging region is disposed so as to straddle a suspension longitudinal direction center between a base end portion of the load bending portion and the dimple.   3. The magnetic head suspension according to claim 2, wherein a slit is provided between each of the bulging region and the distal-side non-bulged region and the proximal-side non-bulged region.   The bulging area includes a longitudinally extending portion that extends inward from the outer surface of the main body portion by a predetermined distance from the outer end portion in the suspension width direction and extends to the opposite side of the disk surface, and the corresponding flange portion. And a laterally extending portion that extends from an intermediate point between the base end portion and the distal end portion inward in the suspension width direction and is connected to the distal end of the longitudinally extending portion. Magnetic head suspension.   5. The magnetic head suspension according to claim 4, wherein the longitudinally extending portion is parallel to the corresponding flange portion and the laterally extending portion is parallel to the main body portion.   The bulging region is an extension that connects an inward point positioned inward by a predetermined distance from an outer end portion in the suspension width direction of the main body portion and an intermediate point between the base end portion and the distal end portion of the flange portion. The magnetic head suspension according to claim 3, wherein the magnetic head suspension has a standing portion.   The extending portion has a curved shape that is convex on the opposite side of the boundary line between the main body portion and the flange portion with reference to a virtual plane that connects the inward point and the intermediate point. The magnetic head suspension according to claim 6.   The magnetic head suspension according to claim 6, wherein the extending portion has a planar shape along a virtual plane connecting the inward point and the intermediate point. The bulging region and the distal-side non-bulged region and the proximal-side non-bulged region are connected,
The bulging region is an extension that connects an inward point positioned inward by a predetermined distance from an outer end portion in the suspension width direction of the main body portion and an intermediate point between the base end portion and the distal end portion of the flange portion. A curved portion that is convex on the opposite side of the bend line between the main body portion and the flange portion with respect to a virtual plane that connects the inward point and the intermediate point. The magnetic head suspension according to claim 2, wherein the magnetic head suspension has a shape. The main body includes a base end side portion in which a suspension width direction outer end portion approaches a suspension longitudinal center line at a first inclination angle from a base end side connected to the load bending portion to a tip end side, and the base A distal end side portion close to the suspension longitudinal center line at a second inclination angle smaller than the first inclination angle from the suspension width direction outer end portion as it goes from the proximal end side to the distal end side connected to the end side portion;
10. The magnetic head according to claim 1, wherein the bulging region is disposed so as to straddle a boundary between the base end side portion and the tip end side portion in the longitudinal direction of the suspension. suspension.

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