Patent Publication Number: US-2020279579-A1

Title: Disk drive suspension

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2019-036110, filed Feb. 28, 2019, the entire contents of which are incorporated herein by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a disk drive suspension used for a hard disk drive, etc., in particular, a suspension comprising a vibration suppression unit which suppresses the vibration of a flexure. 
     2. Description of the Related Art 
     A hard disk drive (HDD) is used for an information processing device such as a personal computer. The hard disk drive includes a magnetic disk which rotates about a spindle, a carriage which turns about a pivot, etc. The carriage comprises an actuator arm, and is turned in the track width direction of the disk about the pivot by a positioning motor such as a voice coil motor. 
     To the actuator arm, a disk drive suspension (hereinafter, simply referred to as a suspension) is attached. The suspension includes a load beam, a flexure provided to overlap the load beam, etc. A slider which constitutes a magnetic head is provided in a gimbal portion formed near the distal end of the flexure. In the slider, elements (transducers) for accessing data, for example, for reading or writing data, are provided. The load beam, the flexure, the slider, etc., constitute a head gimbal assembly. 
     The gimbal portion includes a tongue on which the slider is mounted, and first and second outriggers formed on the both sides of the vicinities of the tongue. These outriggers jut into the outside of the flexure on the both side portions of the flexure. The vicinities of the both end portions of the first and second outriggers in the length direction are secured to the load beam by securing portions such as laser welding. Each of the first and second outriggers can be deformed in the thickness direction like a spring, and serves an important role to ensure the gimbal movement of the tongue. 
     To deal with increased recording density of disks, the size of the head gimbal assembly needs to be further reduced. In addition, the slider should be more precisely positioned with respect to the recording surface of each disk. To achieve this object, it is necessary to reduce the vibration of the flexure as much as possible while ensuring the gimbal movement required for the head gimbal assembly. For example, U.S. Pat. No. 6,967,821 B2 (Patent Literature 1) and JP 2010-86630 A (Patent Literature 2) disclose a damping member for suppressing the vibration of a flexure. The damping member is provided in a part of a suspension. 
     When a vibration is input, the suppression of the vibration of an outrigger may be effective in reducing the vibration of a flexure. Thus, a damping member could be provided in the outrigger itself. Specifically, a damping member is attached to the outrigger so that the outrigger and the damping member can integrally move. However, if a damping member is attached to the outrigger, although the vibration of the flexure can be suppressed, the stiffness of the flexure is increased. For example, it is assumed that a damping member extending in the length direction of the outrigger is attached to the outrigger. In this type of flexure, the stiffness in a pitch direction and the stiffness in a roll direction are increased in comparison with a flexure which does not comprise a damping member. Thus, such a flexure is not preferable for gimbal movement. 
     BRIEF SUMMARY OF THE INVENTION 
     Accordingly, the object of the present invention is to provide a disk drive suspension which can effectively suppress the vibration of a flexure and also prevent an increase in the stiffness of the flexure. 
     According to an embodiment, a disk drive suspension comprises a load beam, a flexure, securing portions, a first outrigger vibration suppression portion and a second outrigger vibration suppression portion. The load beam comprises a first surface, and a second surface on a side opposite to the first surface. The flexure is provided along the first surface of the load beam. The flexure comprises a tongue on which a slider is mounted, a first outrigger arm and a second outrigger arm. The first outrigger arm is provided on an outer side of the tongue in a width direction, and extends in a length direction of the load beam. The second outrigger arm is provided on the other outer side of the tongue in the width direction, and extends in the length direction of the load beam. The securing portions secure a proximal portion of the first outrigger arm and a proximal portion of the second outrigger arm to the load beam. 
     The first outrigger vibration suppression portion comprises a first damping member. The first damping member is provided in a first outrigger root portion including the proximal portion of the first outrigger arm. A part of the first damping member adheres to the load beam. Another part of the first damping member adheres to the first outrigger arm. 
     The second outrigger vibration suppression portion comprises a second damping member. The second damping member is provided in a second outrigger root portion including the proximal portion of the second outrigger arm. A part of the second damping member adheres to the load beam. Another part of the second damping member adheres to the second outrigger arm. 
     The first outrigger arm and the second outrigger arm are part of a metal base of the flexure, and have shapes projecting to the both outer sides of the tongue. Each of the first outrigger arm and the second outrigger arm can be deformed like a spring in a thickness direction of the flexure. 
     The flexure of the present embodiment comprises the tongue, the first outrigger arm, the second outrigger arm, the first outrigger vibration suppression portion and the second outrigger vibration suppression portion. According to the present embodiment, the vibration of the flexure can be effectively suppressed by the first outrigger vibration suppression portion and the second outrigger vibration suppression portion. In addition, an increase in the stiffness of the flexure can be prevented. In this way, it is possible to avoid a detrimental effect or gimbal movement. 
     An example of the first outrigger vibration suppression portion comprises a first aperture portion, a first load beam adhesion portion and a first outrigger adhesion portion. The first aperture portion includes a first aperture formed in the load beam. The first load beam adhesion portion is formed by causing a part of the first damping member to adhere to the second surface of the load beam. The first outrigger adhesion portion is formed by causing another part of the first damping member to adhere to the first outrigger root portion inside the first aperture. 
     An example of the second outrigger vibration suppression portion comprises a second aperture portion, a second load beam adhesion portion and a second outrigger adhesion portion. The second aperture portion includes a second aperture formed in the load beam. The second load beam adhesion portion is formed by causing a part of the second damping member to adhere to the second surface of the load beam. The second outrigger adhesion portion is formed by causing another part of the second damping member to adhere to the second outrigger root portion inside the second aperture. 
     The first outrigger vibration suppression portion may comprise a first spacer. The first spacer is provided between the first damping member and the first outrigger root portion inside the first aperture. The second outrigger vibration suppression portion may comprise a second spacer. The second spacer is provided between the second damping member and the second outrigger root portion inside the second aperture. 
     An example of the first outrigger vibration suppression portion comprises the first damping member having a shape covering the first aperture, the first load beam adhesion portion present around the first aperture, and the first outrigger adhesion portion present inside the first aperture. An example of the second outrigger vibration suppression portion comprises the second damping member having a shape covering the second aperture, the second load beam adhesion portion present around the second aperture, and the second outrigger adhesion portion present inside the second aperture. 
     Another example of the first outrigger vibration suppression portion comprises the first damping member having a rectangular shape extending in a length direction of the first aperture, the first load beam adhesion portion present in each end portion of the first damping member, and the first outrigger adhesion portion present inside the first aperture. Another example of the second outrigger vibration suppression portion comprises the second damping member having a rectangular shape extending in a length direction of the second aperture, the second load beam adhesion portion present in each end portion of the second damping member, and the second outrigger adhesion portion present inside the second aperture. 
     Another example of the first outrigger vibration suppression portion comprises the first damping member having a cruciform shape. The cruciform first damping member includes a vertical portion extending in a length direction of the first aperture and a lateral portion extending in a width direction of the first aperture. The second outrigger vibration suppression portion may comprise the second damping member having a cruciform shape. The cruciform second damping member includes a vertical portion extending in a length direction of the second aperture and a lateral portion extending in a width direction of the second aperture. 
     An example of the first outrigger vibration suppression portion comprises a first bending portion inserted into the first aperture in a part of the first outrigger arm in a length direction. The first outrigger adhesion portion is formed by causing the first bending portion to adhere to the first damping member in the first aperture. An example of the second outrigger vibration suppression portion comprises a second bending portion inserted into the second aperture in a part of the second outrigger arm in a length direction. The second outrigger adhesion portion is formed by causing the second bending portion to adhere to the second damping member in the second aperture. 
     The first outrigger vibration suppression portion may comprise the first damping member provided on the first surface of the load beam, a first load beam adhesion portion formed by causing a part of the first damping member to adhere to the first surface, and a first outrigger adhesion portion formed by causing another part of the first damping member to adhere to the first outrigger root potion. The second outrigger vibration suppression portion may comprise the second damping member provided on the first surface of the load beam, a second load beam adhesion portion formed by causing a part of the second damping member to adhere to the first surface, and a second outrigger adhesion portion formed by causing another part of the second damping member to adhere to the second outrigger root potion. 
     Additional objects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objects and advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out hereinafter. 
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
     The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention, and together with the general description given above and the detailed description of the embodiments given below. 
       FIG. 1  is a perspective illustration showing an example of a disk drive. 
       FIG. 2  is a cross-sectional view of a part of the disk drive shown in  FIG. 1 . 
       FIG. 3  is a perspective illustration showing a disk drive suspension according to a first embodiment. 
       FIG. 4  is a perspective illustration in which a part of the suspension shown in  FIG. 3  is seen from the slider side. 
       FIG. 5  is a plan view of a part of the suspension shown in  FIG. 4 . 
       FIG. 6  is a cross-sectional view of a part of the suspension along line F 6 -F 6  of  FIG. 5 . 
       FIG. 7  is a plan view schematically showing the outrigger vibration suppression portions of the suspension shown in  FIG. 4 . 
       FIG. 8  is a cross-sectional view of the outrigger vibration suppression portion along line F 8 -F 8  of  FIG. 7 . 
       FIG. 9  shows the vibration intensity of a flexure when the suspension comprises the outrigger vibration suppression portions and when the suspension does not comprise the outrigger vibration suppression portions. 
       FIG. 10  shows the stiffness of the flexure when the suspension comprises the outrigger vibration suppression portions and when the suspension does not comprise the outrigger vibration suppression portions. 
       FIG. 11  is a plan view schematically showing outrigger vibration suppression portions according to a second embodiment. 
       FIG. 12  is a plan view schematically showing outrigger vibration suppression portions according to a third embodiment. 
       FIG. 13  is a cross-sectional view of an outrigger vibration suppression portion according to a fourth embodiment. 
       FIG. 14  is a cross-sectional view of an outrigger vibration suppression portion according to a fifth embodiment. 
       FIG. 15  is a cross-sectional view of an outrigger vibration suppression portion according to a sixth embodiment. 
       FIG. 16  is a plan view of a part of a suspension according to a comparison example. 
       FIG. 17  shows the stiffness of a flexure when the suspension shown in  FIG. 16  comprises a damping member and when the suspension does not comprise a damping member. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Hereinafter, this specification explains a disk drive suspension according to a first embodiment with reference to  FIG. 1  to  FIG. 10 . 
       FIG. 1  shows a disk drive (HDD)  1  comprising a case  2 , a disk  4  which rotates about a spindle  3 , a carriage  6  turnable about a pivot  5 , a positioning motor (voice coil motor)  7  for driving the carriage  6 , etc. The case  2  is sealed by a lid (not shown). 
       FIG. 2  is a cross-sectional view schematically showing a part of the disk drive  1 . As shown in  FIG. 1  and FIG,  2 , an arm (carriage arm)  8  is provided in the carriage  6 . A suspension  10  is attached to the distal end. portion of the arm  8 . A slider  11  which constitutes a magnetic head is provided in the distal end portion of the suspension  10 . When the disk  4  rotates at high speed, air flows in between the disk  4  and the slider  11 , thereby forming an air bearing. When the carriage  6  is turned by the positioning motor  7 , the suspension  10  moves in the radial direction of the disk  4 . In this way, the slider  11  moves to a desired track of the disk  4 . 
     The suspension  10  shown in  FIG. 3  comprises a baseplate  20  secured to the arm  8  (shown in  FIG. 1  and  FIG. 2 ) of the carriage  6 , a load beam  21 , and a flexure  22 . A boss portion  20   a  to be inserted into a hole  8   a  (shown in  FIG. 2 ) formed in the arm  8  is formed in the baseplate  20 . 
     The direction indicated by arrow X in  FIG. 3  is the length direction of the load beam  21  and the flexure  22 , in other words, the length direction of the suspension  10 . The flexure  22  is provided along the load beam  21  and extends in the length direction of the load beam  21 . Arrow Y is a sway direction (the width direction of the flexure  22 ). The load beam  21  comprises a first surface  21   a  on a side the flexure  22  is provided, and a second surface  21   b  on a side opposite to the first surface  21   a.  A damper member  25  is provided in the load beam  21  as needed. 
       FIG. 4  is a perspective illustration in which a part of the distal end side of the suspension  10  is seen from the slider  11  side. In the distal end portion of the slider  11  which constitutes the magnetic head, elements  28  capable of performing conversion between magnetic signals and electric signals, such as magnetoresistive (MR) elements, are provided. These elements  28  are used for accessing data, for example, for writing or reading data, with respect to the disk  4 . The slider  11 , the load beam  21 , the flexure  22  and the like constitute a head gimbal assembly. The flexure  22  is provided on the first surface  21   a  of the load beam  21 . 
     The flexure  22  comprises a metal base  40  formed of a thin plate of stainless steel, and a circuit portion  41  provided along the metal base  40 . The thickness of the metal base  40  (for example, 12 to 25 μm) is less than the thickness of the load beam  21  (for example, 30 μm). For example, the thickness of the metal base  40  is 20 μm. A part of the circuit portion  41  is electrically connected to the elements  28  of the slider  11  via terminals  41   a  (shown in  FIG. 4 ) for the slider  11 . 
       FIG. 5  is a plan view in which the vicinity of the distal end portion of the suspension  10  is seen from the slider  11  side. A tongue  45  on which the slider  11  is mounted is formed in a part of the metal base  40 . A first outrigger arm  51  and a second outrigger arm  52  are formed on the both outer sides of the tongue  45  in the width direction (indicated by arrow Y 1  in  FIG. 5 ) of the tongue  45 . The first outrigger arm  51  and the second outrigger arm  52  have shapes projecting to the outer sides of the both lateral portions of the tongue  45  in the width direction of the tongue  45 . The tongue  45  and a pair of outrigger arms  51  and  52  are part of the metal base  40 . The outline of each of the tongue  45  and the outrigger arms  51  and  52  is formed by, for example, etching. 
       FIG. 6  is a cross-sectional view of a part of the suspension  10  along line F 6 -F 6  of  FIG. 5 . A dimple  55  protruding to the tongue  45  is formed near the distal end of the load beam  21 . A distal end  55   a  of the dimple  55  is in contact with the tongue  45 . The tongue  45  swings based on the distal end  55   a  of the dimple  55  and is capable of performing a desired gimbal movement. The tongue  45 , the outrigger arms  51  and  52 , the dimple  55 , etc., constitute a gimbal portion  56 . 
     The first outrigger arm  51  is provided on the outer side of a lateral portion of the tongue  45  and extends in the length direction (indicated by arrow X in  FIG. 5 ) of the flexure  22 . The first outrigger arm  51  comprises a proximal portion  51   a  secured to the load beam  21  by a securing portion  61 . The first outrigger arm  51  comprises a distal end side arm portion  51   b  continuous with a distal end portion  22   a  of the flexure  22 . The distal end portion  22   a  of the flexure  22  is secured to the vicinity of the distal end of the load beam  21  by a securing portion  62 . The securing portions  61  and  62  are formed by, for example, laser spot welding. The both end portions of the first outrigger arm  51  in the length direction are supported by the securing portions  61  and  62 . The portion between the securing portions  61  and  62  can be deformed in the thickness direction of the metal base  40 . 
     In this specification, a portion which is a part of the first outrigger arm  51  in the length direction and is near the proximal portion  51   a  including the securing portion  61  is referred to as a first outrigger root portion  51   c.  As shown in  FIG. 5 , the first outrigger root portion  51   c  has a shape angled at angle θ 1 . The vicinity of the distal end portion of the first outrigger arm  51  is connected to a lateral portion of the tongue  45  via a connection portion  51   d.    
     The second outrigger arm  52  is provided on the outer side of the other lateral portion of the tongue  45  and extends in the length direction (indicated by arrow X in  FIG. 5 ) of the flexure  22 . The second outrigger arm  52  comprises a proximal portion  52   a  secured to the load beam  21  by a securing portion  63 . The second outrigger arm  52  comprises a distal end side arm portion  52   b  continuous with the distal end portion  22   a  of the flexure  22 . 
     In this specification, a portion which is a part of the second outrigger arm  52  in the length direction and is near the proximal portion  52   a  including the securing portion  63  is referred to as a second outrigger root portion  52   c.  As shown in  FIG. 5 , the second outrigger root portion  52   c  has a shape angled at angle θ 2 . The vicinity of the distal end portion of the second outrigger arm  52  is connected to the other lateral portion of the tongue  45  via a connection portion  52   d.    
     The both end portions of the second outrigger arm  52  in the length direction are supported by the securing portions  62  and  63 . The portion between the securing portions  62  and  63  can be deformed in the thickness direction of the metal base  40 . The tongue  45  is elastically supported by the first outrigger arm  51  and the second outrigger arm  52 . Thus, the tongue  45  is capable of swing based on the dimple  55 . 
     A pair of microactuator elements  65  and  66  is mounted in the gimbal portion  56 . The microactuator elements  65  and  66  are formed of piezoelectric materials, and are provided on the both sides of the slider  11 . The first microactuator element  65  comprises both end portions  65   a  and  65   b  secured to actuator supporting portions  70  and  71  of the tongue  45 , respectively. The second microactuator element  66  comprises both end portions  66   a  and  66   b  secured to actuator supporting portions  72  and  73  of the tongue  45 , respectively. 
     The microactuator elements  65  and  66  have a function of rotating the tongue  45  in a sway direction (indicated by arrow Y in  FIG. 3 ). A limiter member  75  which prevents the tongue  45  from excessively swing is provided between a lateral portion of the tongue  45  and the first outrigger arm  51 . Similarly, a limiter member  76  is provided between the other lateral portion of the tongue  45  and the second outrigger arm  52 . 
     The suspension  10  of the present embodiment comprises a first outrigger vibration suppression portion  80  corresponding to the first outrigger arm  51  and a second outrigger vibration suppression portion  90  corresponding to the second outrigger arm  52 . Each of the first and second outrigger vibration suppression portions  80  and  90  functions as a vibration suppression unit which suppresses the vibration of the flexure  22 . 
       FIG. 7  is a plan view schematically showing the first outrigger vibration suppression portion  80  and the second outrigger vibration suppression portion.  90 . The first outrigger vibration suppression portion  80  and the second outrigger vibration suppression portion  90  are bilaterally symmetric. Their structures are substantially the same as each other.  FIG. 8  is a cross-sectional view of the first outrigger vibration suppression portion  80 . 
     The first outrigger vibration suppression portion  80  includes a first aperture  81  formed in the load beam  21 , and a first damping member  82  provided in the first outrigger root portion  51   c.  The first aperture  81  penetrates the load beam  21  in the thickness direction. The first damping member  82  is provided on a second surface  21   b  of the load beam  21 . In this specification, a portion including the first aperture  81  and its peripheral portion is referred to as a first aperture portion. 
     The first damping member  82  is provided in the first aperture portion. The first damping member  82  has a size so as to cover the first aperture  81 . As shown in  FIG. 8 , the first damping member  82  comprises a viscoelastic material layer  83  and a constrained plate  84 . The viscoelastic material layer  83  is formed of a polymeric material (for example, acrylic resin) which can exhibit viscosity resistance when it is deformed. The viscoelastic material layer  83  has viscosity. The thickness of the viscoelastic material layer  83  is, for example, 51 μm. The constrained plate  84  is formed of synthetic resin such as polyester, and is stacked in the thickness direction of the viscoelastic material layer  83 . The thickness of the constrained plate  84  is, for example, 51 μm. 
     As shown in  FIG. 3  to  FIG. 5  and  FIG. 7 , the first outrigger root portion  51   c  is provided at a position facing the first aperture  81 . The first outrigger root portion  51   c  is a part of the outrigger arm  51  in the length direction. The first damping member  82  covers the first aperture  81 . The damping member  82  is provided on the second surface  21   b  of the load beam  21 . The first damping member  82  is secured to both the second surface  21   b  of the load beam  21  and the first outrigger root portion  51   c  by the adhesion of the viscoelastic material layer  83 . 
     Thus, a part at the viscoelastic material layer  83  of the first damping member  82  adheres to the second surface  21   b  of the load beam  21  in the first aperture portion. In this way, a first load beam adhesion portion  85  is formed. Another part of the viscoelastic material layer  83  of the first damping member  82  adheres to the first outrigger root portion  51   c  inside the first aperture  81 . In this way, a first outrigger adhesion portion  86  is formed. 
     As shown in  FIG. 8 , the first outrigger vibration suppression portion  80  may include a first spacer  87 . The first spacer  87  is provided between the viscoelastic material layer  83  of the first damping member  82  and the first outrigger root portion  51   c.  The thickness of the first spacer  87  should be preferably equal to the thickness of the load beam  21 . An adhesive layer is provided on a surface of the first spacer  87  (in other words, the surface facing the outrigger root portion  51   c ). The first damping member  82  adheres to the first outrigger arm  51  via the first spacer  87 . Thus, the first outrigger adhesion portion  86  is formed between the first damping member  82  and the first outrigger root portion  51   c.    
     The second outrigger vibration suppression portion  90  includes a second aperture  91  formed in the load beam  21 , and a second damping member  92  provided in the second outrigger root portion  52   c.  The second aperture  91  penetrates the load beam  21  in the thickness direction. The second damping member  92  is provided on the second surface  21   b  of the load beam  21 . In this specification, a portion including the second aperture  91  and its peripheral portion is referred to as a second aperture portion. 
     The second damping member  92  is provided in the second aperture portion. The second damping member  92  has a size so as to cover the second aperture  91 . The second damping member  92  comprises the viscoelastic material layer  83  and the constrained plate  84  (shown in  FIG. 8 ) in a manner similar to that of the first damping member  82 . 
     As shown in  FIG. 3  to  FIG. 5  and  FIG. 7 , the second outrigger root portion  52   c  is provided at a position facing the second aperture  91 . The second outrigger root portion  52   c  is a part of the outrigger arm  52  in the length direction. The second damping member  92  covers the second aperture  91 . The damping member  92  is provided on the second surface  21   b  of the load beam  21 . The second damping member  92  is secured to both the second surface  21   b  of the load beam  21  and the second outrigger root portion  52   c  by the adhesion of the viscoelastic material layer. 
     Thus, a part of the viscoelastic material layer of the second damping member  92  adheres to the second surface  21   b  of the load beam  21  in the second aperture portion. In this way, a second load beam adhesion portion  95  is formed. Another part of the viscoelastic material layer of the second damping member  92  adheres to the second outrigger root portion  52   c  inside the second aperture  91 . In this way, a second outrigger adhesion portion  96  is formed. 
     The second outrigger vibration suppression portion  90  includes a second spacer  97  similar to the first spacer  87  (shown in  FIG. 8 ). The second spacer  97  is provided between the viscoelastic material layer of the second damping member  92  and the second outrigger root portion  52   c.  The second damping member  92  adheres to the second outrigger arm  52  via the second spacer  97 . Thus, the second outrigger adhesion portion is formed between the second damping member  92  and the second outrigger root portion  52   c.  The thickness of the second spacer  97  should be preferably equal to the thickness of the load beam  21 . 
     Now, the operation of the suspension  10  of the present embodiment is explained. 
     When the carriage  6  (shown in  FIG. 1  and  FIG. 2 ) is turned by the positioning motor  7 , the suspension  10  moves in the radial direction of the disk  4 . In this way, the slider  11  of the magnetic head moves to a desired track of the recording surface of the disk  4 . When voltage is applied to the microactuator elements  65  and  66 , the microactuator elements  65  and  66  are distorted based on the voltage. In this way, the load beam  21  slightly moves in a sway direction (indicated by arrow Y in  FIG. 3 ). 
     The suspension  10  of the present embodiment comprises the outrigger vibration suppression portions  80  and  90  in the outrigger root portions  51   c  and  52   c  of the two outrigger arms  51  and  52 , respectively. The outrigger root portions  51   c  and  52   c  include the proximal portions  51   a  and.  52   a,  respectively. When energy for vibrating the flexure  22  is input from outside to the suspension  10 , the viscoelastic material layer  83  of each of the damping members  82  and  92  is deformed. When the viscoelastic material layer  83  is deformed, internal resistance is caused by the friction of the molecules constituting the viscoelastic material layer  83 . Thus, vibration energy is converted into thermal energy, thereby preventing the vibration of the flexure  22 . 
       FIG. 9  shows the frequency response characteristics when the suspension  10  comprising the outrigger vibration suppression portions  80  and  90  in the present embodiment is vibrated and when a suspension which comprises neither the outrigger vibration suppression portion  80  nor the outrigger vibration suppression portion  90  is vibrated. In  FIG. 9 , the solid line S 1  indicates the frequency response characteristics of the suspension  10  comprising the outrigger vibration suppression portions  80  and  90 . In  FIG. 9 , the dashed line S 2  indicates the frequency response characteristics of a suspension which comprises neither the outrigger vibration suspension portion  80  nor the outrigger vibration suppression portion  90 . In the suspension  10  comprising the outrigger vibration suppression portions  80  and  90 , the torsion mode around 10 to 11 kHz and the gain around 15 kHz are suppressed in comparison with the suspension which comprises neither the outrigger vibration suppression portion  80  nor the outrigger vibration suppression portion  90 . 
     In  FIG. 10 , A and B indicate the stiffness in a itch direction and the stiffness in a roll direction, respectively, in the flexure  22  comprising the outrigger vibration suppression portions  80  and  90 . In  FIG. 10 , C and C indicate the stiffness in a pitch direction and the stiffness in a roll direction, respectively, in a flexure which comprises neither the outrigger vibration suppression portion  80  nor the out vibration suppression portion  90 . As shown in A and C of  FIG. 10 , regarding the stiffness in a pitch direction, the stiffness of the flexure  22  comprising the outrigger vibration suppression portions  80  and  90  is substantially equal to the stiffness of the flexure which comprises neither the outrigger vibration suppression portion  80  nor the outrigger vibration suppression portion  90 . As shown in B and D of  FIG. 10 , regarding the stiffness in a roll direction, the stiffness of the flexure  22  comprising the outrigger vibration suppression portions  80  and  90  is substantially equal to the stiffness of the flexure which comprises neither the outrigger vibration suppression portion  80  nor the outrigger vibration suppression portion  90 . This figure confirms that the provision of the outrigger vibration suppression portions  80  and  90  does not detrimentally affect the gimbal movement of the flexure. 
       FIG. 11  shows a first outrigger vibration suppression portion  80 A and a second outrigger vibration suppression portion  90 A according to a second embodiment. A first damping member  82 A provided in the first outrigger vibration suppression portion  80 A has a rectangular shape extending in the length direction X 1  of a first aperture  81 . A first load beam adhesion portion  85  is formed in each end portion of the first damping member  82 A. A first outrigger adhesion portion  86  is formed inside the first aperture  81 . 
     A second damping member  92 A provided in the second outrigger vibration suppression portion  90 A has a rectangular shape extending in the length direction X 2  of a second aperture  91 . A second load beam adhesion portion  95  is formed in each end portion of the second damping member  92 A. A second outrigger adhesion portion  96  is formed inside the second aperture  91 . The other structures and effects are common to the suspension  10  of the first embodiment and the suspension of the second embodiment. Thus, common reference numbers are added to portions that are common to the first and second embodiments, an explanation thereof being omitted. 
       FIG. 12  shows a first outrigger vibration suppression portion  80 B and a second outrigger vibration suppression portion  90 B according to a third embodiment. A first damping member  825  is cruciform. The cruciform damping member  82 B includes a vertical portion  100  and a lateral portion  101 . The vertical portion  100  extends in the length direction X 1  of a first aperture  81 . The lateral portion  101  extends in the width direction W 1  of the first aperture  81 . A first load beam adhesion portion  85  is formed in each end portion of the vertical portion  100  and each end portion of the lateral portion  101 . Inside the first aperture  81 , a first outrigger root portion  51   c  adheres to the first damping member  82 B. Thus, a first outrigger adhesion portion  86  is formed. 
       FIG. 12  shows a second damping member  92 B which is also cruciform. The cruciform damping member  925  includes a vertical portion  110  and a lateral portion  111 . The vertical portion  110  extends in the length direction X 2  of a second aperture  91 . The lateral portion  111  extends in the width direction W 2  of the second aperture  91 . A second load beam adhesion portion  95  is formed in each end portion of the vertical portion  110  and each end portion of the lateral portion  111 . Inside the second aperture  91 , a second outrigger root portion  52   c  adheres to the second damping member  92 B. Thus, a second outrigger adhesion portion  96  is formed. The other structures and effects are common to the suspension  10  of the first embodiment and the suspension of the third embodiment. Thus, common reference numbers are added to portions that are common to the first and third embodiments, an explanation thereof being omitted. 
       FIG. 13  is a cross-sectional view of a first outrigger vibration suppression portion  80 C provided in a suspension according to a fourth embodiment. Although a second outrigger vibration suppression portion is not shown, the structure is common to the first outrigger vibration suppression portion  80 C and the second outrigger vibration suppression portion. Thus, the first outrigger vibration suppression portion  80 C is explained as a representative example here. The outrigger vibration suppression portion  80 C of the present embodiment is deformed such that a part  120  of a first damping member  82  is inserted into the inside of the first aperture  81 . The first damping member  82 C adheres to a first outrigger root portion  51   c.  Thus, a first outrigger adhesion portion  86  is formed. The other structures and effects are common to the suspension  10  of the first embodiment and the suspension of the fourth embodiment. Thus, common reference numbers are added to portions that are common to the first and fourth embodiments, an explanation thereof being omitted. 
       FIG. 14  is a cross-sectional view of a first outrigger vibration suppression portion  80 D provided in a suspension according to a fifth embodiment. Although a second outrigger vibration suppression portion is not shown, the structure is common to the first outrigger vibration suppression portion  80 D and the second outrigger vibration suppression portion. Thus, the first outrigger vibration suppression portion  80 D is explained as a representative example here. The outrigger vibration suppression portion  80 D of the present embodiment comprises a bending portion  130  inserted into the inside of a first aperture  81 . The bending portion  130  is formed by bending a part of the length direction of a first outrigger arm  51  in a thickness direction by plastic working. A viscoelastic material layer  83  of a first damping member  82 D adheres to the bending portion  130 . Thus, a first outrigger adhesion portion  86  is formed. The other structures and effects are common the suspension  10  of the first embodiment and the suspension of the fifth embodiment. Thus, common reference numbers are added to portions that are common to the first and fifth embodiments, an explanation thereof being omitted. 
       FIG. 15  is a cross-sectional view of a first outrigger vibration suppression portion  80 E provided in a suspension according to a sixth embodiment. Although a second outrigger vibration suppression portion is not shown, the structure is common to the first outrigger vibration suppression portion  80 E and the second outrigger vibration suppression portion. Thus, the first outrigger vibration suppression portion  80 E is explained as a representative example here. The outrigger vibration suppression portion  80 E of the present embodiment comprises a first damping member  82  provided on a first surface  21   a  of a load beam  21 , a first load beam adhesion portion  85  formed on the first surface  21   a,  and a first outrigger adhesion portion  86 . The first load beam adhesion portion  85  is formed by causing a part of the first damping member  82  to adhere to the first surface  21   a  of the load beam  21 . The first outrigger adhesion portion  86  is formed by causing another part of the first damping member  82  to adhere to a first outrigger arm  51 . The other structures and effects are common to the suspension  10  of the first embodiment and the suspension of the sixth embodiment. Thus, common reference numbers are added to portions that are common to the first and sixth embodiments, an explanation thereof being omitted. 
       FIG. 16  shows a suspension  200  as a comparison example. The suspension  200  comprises slender damping members  213  and  214  on outrigger arms  211  and  212  provided in a flexure  210 , respectively. The damping members  213  and  214  adhere to only the outrigger arms  211  and  212 , respectively. The damping members  213  and  214  extend in the length directions of the outrigger arms  211  and  212 , respectively. This suspension  200  can also prevent the vibration of a gimbal portion  220 . However, as explained below, the stiffness of the flexure is great in comparison with a suspension which comprises neither the damping member  213  nor the damping member  214 . 
     In  FIG. 17 , E and F indicate the stiffness in a pitch direction and the stiffness in a roll direction, respectively, in the suspension  200  of the comparison example shown in  FIG. 16 . The suspension  200  comprises the damping members  213  and  214 . In  FIG. 17 , G and H indicate the stiffness in a pitch direction and the stiffness in a roll direction, respectively, in a suspension which comprises neither the damping member  213  nor the damping member  214 . Stiffnesses E and F of the flexure comprising the damping members  213  and  214  are increased by approximately 13% compared to the flexure which comprises neither the damping member  213  nor the damping member  214 . Thus, the gimbal movement is detrimentally affected. 
     The damping members  213  and  214  of the comparison. example shown in  FIG. 16  extend greatly in the length directions of the outrigger arms  211  and  212 . Thus, the shipping comb used when the suspension  200  is attached to the disk drive may interfere with the damping members  213  and  214 . This may result in a damage to the damping members  213  and  214 . In the suspension of each embodiment of the present invention, damping members which are comparatively small are provided in the outrigger root portions  51   c  and  52   c,  respectively. Thus, the suspension of each embodiment can prevent the damping members from interfering with the shipping comb. 
     As a matter of course, when the present invention is implemented, the specific forms of the elements constituting the disk drive suspension, such as the shapes of the load beam and the flexure, and the layout of the first and second outrigger vibration suppression portions, may be changed in various ways. For example, a single damping member in which the first damping member and the second damping member are integrally continuous with each other may be used. The first and second outrigger vibration suppression portions similar to those of each embodiment may be provided in a suspension which comprises neither the microactuator element  65  nor the microactuator element  66 . 
     Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.