KR100721301B1 - Actuator for magnetic head and magnetic disc drive - Google Patents

Abstract

The present invention relates to an actuator for a magnetic head and a magnetic disk apparatus for moving the magnetic head to a predetermined position on the magnetic disk by driving an arm on a rotating magnetic disk, wherein the suspension supporting the magnetic head is installed and driven at the same time. An actuator for magnetic head, comprising: an arm for moving a magnetic head, comprising: a damper comprising, on at least one surface of the arm, a restraining material that suppresses the vibration from occurring in the arm and a viscoelastic material that absorbs the vibration generated in the arm; Install ash.

Description

ACTUATOR FOR MAGNETIC HEAD AND MAGNETIC DISC DRIVE}

TECHNICAL FIELD The present invention relates to an actuator for a magnetic head and a magnetic disk device, and more particularly to an actuator for a magnetic head and a magnetic disk device for moving a magnetic head to a predetermined position on the magnetic disk by driving an arm on a rotating magnetic disk.

For example, in a magnetic disk device such as a hard disk drive (HDD), the head slider of the magnetic head floats above the rotating magnetic disk, and the magnetic head element reads or writes information to or from the magnetic disk in the floating state. Do it. In recent years, in order to raise the recording density of a magnetic disk, decreasing the floating amount of a head slider, and making a magnetic head element small is advancing. As described above, in order to accurately position the magnetic head element on a predetermined information track of the high-density magnetic disk, it is necessary to suppress vibration of the arm moving on the magnetic disk.

1 shows a magnetic disk device 1 which is a conventional example. In this figure, the cover is removed.

The magnetic disk device 1 is roughly comprised of a housing 2, a magnetic disk 3, an actuator for a magnetic head (hereinafter referred to as a head actuator) 4, a voice coil motor 5, and the like. . The housing 2 protects each of the above-described components 3, 4, 5 and the like by mounting a cover (not shown) and prevents dust from entering the apparatus from the outside. In addition, the magnetic disk 3 rotates at a high speed by a spindle motor not shown.

The head actuator 4 has an E-block 14 in which a plurality of (five in the illustrated example) actuator arms 6 are provided, as enlarged in FIGS. 2 and 3. In addition, the shaft hole 12 through which the shaft 8 inserted in the housing 2 is inserted is formed in the substantially center of the E-block 14. Moreover, the coil 13 which comprises a part of the voice coil motor 5 is arrange | positioned on the opposite side to the arrangement position of the actuator arm 6 with this axial hole 12 interposed.

The actuator arm 6 is a plate member made of aluminum and is provided in the E-block 14 as described above. A suspension attachment portion 11 is formed at the tip end of each actuator arm 6, and a suspension 7 on which a magnetic head is mounted is attached to the suspension attachment portion 11. Normally, the suspension 7 (not shown in Figs. 2 and 3) is fixed to the suspension attachment portion 11 by caulking.

The voice coil motor 5 is comprised by the coil 13 provided in the head actuator 4, the magnet which generate | occur | produces a magnetic force, the yoke 5a etc. for applying this magnetic force to the coil 13, and the like. The magnet is configured so that the generated magnetic force penetrates the coil 13, and thus, the force to rotate about the shaft 8 is generated in the head actuator 4 by varying the strength of the current supplied to the coil 13. do. Accordingly, the head actuator 4 rotates around the shaft 8 to move the magnetic head disposed through the suspension 7 at the tip of the actuator arm 6 to a predetermined position on the magnetic disk 3. .

Here, when the actuator arm 6 is noticed, the actuator arm 6 reduces the weight (it penetrates the actuator arm 6 up and down in the illustrated example), thereby reducing the long oval-shaped weight reduction hole 15. Is formed.

In this way, the moment of inertia of the actuator arm 6 can be reduced by forming the weight reducing hole 15 in the actuator arm 6. For this reason, by providing the weight reduction hole 15, the high speed access of the head actuator 4 can be enabled.

By the way, the actuator arm 6 in which this weight reduction hole 15 was formed has various vibration modes from several kHz to several 10 kHz. 4 shows a typical example thereof. Damping for this oscillation mode is very low due to the original structure of the actuator arm 6 due to the integral structure of the metal member, and the damping constant ζ = 0.01 (in other words, the resonance magnification at the time of resonance is about 50 times larger). It becomes the peak, and hinders positioning accuracy.

On the other hand, as described above, the recording density of the magnetic disk 3 is doubled year by year, and the track density TPI is improved by 50% or more per year. In order to improve the track density, it is necessary to improve the positioning accuracy. In the recent magnetic disk apparatus 1, the track pitch is 0.4 µm and the permissible NRRO (shake accuracy) is 50 nm.

In particular, in the high speed rotating disk (10,000 rpm, 15,000 rpm), the air flow generated by the high speed rotation of the magnetic disk 3 internally impinges on the actuator arm 6, causing the actuator arm 6 to become aerodynamic. The state in which the actuator arm 6 is excited by natural vibration due to this aerodynamic excitation is indicated at positions (approximately 7.6 kHz, 12.0 kHz) indicated by arrows A and B in FIG.

In this way, when the air is excited with respect to the actuator arm 6 and excited by the natural vibration of the actuator arm 6, the actuator arm is formed even if the head actuator 4 is fast-accessed by forming the weight reducing hole 15. Positioning accuracy falls by the vibration of (6), and it becomes impossible to position a magnetic head in a predetermined position.

SUMMARY OF THE INVENTION The present invention has a general object to provide an actuator for a magnetic head and a magnetic disk device that solve the aforementioned problems of the prior art.

A more detailed object of the present invention is to provide an actuator for a magnetic head and a magnetic disk device capable of reducing the influence of air excitation on an arm.

In order to achieve this object, the present invention provides an actuator for a magnetic head comprising an arm for moving the magnetic head by being driven while a suspension supporting the magnetic head is provided, wherein at least one side of the arm is provided with the arm. The damper material which raises rigidity of an arm and absorbs the vibration which arose in the said arm is provided.

According to the above invention, even if an excitation force is applied to the arm by the flow of air generated by the rotation of the magnetic disk, the rigidity of the arm is increased by providing the damper material, and vibration generated in the arm is absorbed. For this reason, unnecessary vibration can be prevented from occurring in the arm, and accordingly, the magnetic head positioning by the magnetic head actuator can be performed with high accuracy.

Moreover, in order to achieve the said objective, this invention is the actuator for magnetic heads provided with the arm which moves the magnetic head by the drive which is equipped with the suspension which supports a magnetic head, At least one surface of the said arm. The damper material which consists of a restraining material which suppresses a vibration generate | occur | produced in the said arm, and a viscoelastic material which absorbs the vibration which arose in the said arm is provided.

According to the above invention, even if an excitation force is applied to the arm by the flow of air generated by the rotation of the magnetic disk, the vibration is suppressed by the restraining material of the damper material, and the vibration generated in the arm is a viscoelastic material of the damper material. Is absorbed by. For this reason, unnecessary vibration can be prevented from occurring in the arm, and accordingly, the magnetic head positioning by the magnetic head actuator can be performed with high accuracy.

In the above invention, the damper material may be arranged symmetrically on both sides of the arm.

By setting it as this structure, since damper material was arrange | positioned symmetrically on both sides of an arm, the balance of an arm becomes favorable and it can suppress more effectively that an unnecessary vibration generate | occur | produces in an arm.

Moreover, in the said invention, you may make it the structure which provided the weight reduction part which reduced the weight to the said arm, and arrange | positioned the said damper material in the position including the formation position of the said weight reduction part.

With this configuration, the weight of the arm is reduced by providing a weight reducing portion in which the weight is reduced and the inertia moment is also reduced accordingly. Therefore, the seek time of the actuator for the magnetic head is reduced. It can shorten. Moreover, by arrange | positioning a damper material in the position containing the formation position of the weight reduction part of this arm, the unnecessary vibration which originated at this weight reduction part can be suppressed. That is, in the state where the weight reducing portion is exposed as in the prior art, the flow of air flows into the weight reducing portion, causing the arm to excite and causing unnecessary vibration. However, by disposing the damper material at the position including the position where the weight reducing part of the arm is formed, the weight reducing part is blocked by the damper material. For this reason, unnecessary vibration generated by the flow of air into the weight reducing portion can be suppressed, and therefore, the magnetic head positioning by the magnetic head actuator can be performed with high accuracy.

Moreover, in the said invention, you may be set as the structure which provided the said damper material partially in the said arm.

By setting it as this structure, it becomes possible to adjust a dustproof effect by the position and area where a damper material is provided.

In the above invention, the restraining material may be formed of a material having a rigidity higher than that of aluminum. The restraint member may be formed of a stainless material.

By setting it as this structure, since a restraint material has high rigidity, it can reliably prevent that an arm is excited by the flow of air.

Furthermore, in the said invention, while providing the weight reduction part which reduces a weight in the said arm, the said damper material is arrange | positioned in the position including the formation position of the said weight reduction part, and it opposes the said weight reduction part of the damper material. It is good also as a structure remove | eliminated the said viscoelastic material in a position.

With this configuration, it is possible to prevent the dust penetrating into the weight-reducing portion at the time of assembly from joining to the viscoelastic material, thus improving the reliability of the magnetic disk device into which the magnetic head actuator is inserted.

Furthermore, in the said invention, while providing the weight reduction part which reduces a weight in the said arm, the said damper material is arrange | positioned in the position including the formation position of the said weight reduction part, and it opposes the said weight reduction part of the damper material. It is good also as a structure which provided the opening part in the position.

By setting it as the above structure, while increasing the rigidity of the arm, while absorbing vibration, the moment of inertia of the arm including the damper material can be reduced. This makes it possible to achieve both high speed seek processing and high precision positioning processing in the movement processing of the magnetic head.

Moreover, in the said invention, it is good also as a structure which attached the tail of the said suspension to the said arm using the said viscoelastic material.

With the above configuration, since the tail of the suspension is attached to the arm using a viscoelastic material, there is no need to separately install a structure for fixing the tail to the arm, and the configuration of the actuator for the magnetic head can be simplified. .

In order to achieve the above object, the present invention provides a magnetic disk as a recording medium, a rotating means for rotating the magnetic disk, and a suspension for supporting the magnetic head. A magnetic disk device comprising a magnetic head actuator having an arm to be provided, wherein the damper material is provided on at least one surface of the arm provided on the magnetic head actuator.

According to the above invention, even if an excitation force is applied to the arm by the flow of air generated by the rotation of the magnetic disk, the rigidity of the arm is increased by providing the damper material, and vibration generated in the arm is absorbed. For this reason, unnecessary vibration can be prevented from occurring in the arm, and accordingly, the positioning of the magnetic head by the magnetic head actuator can be performed with high accuracy, and the reliability of the magnetic disk device can be improved.

In order to achieve the above object, the present invention provides a magnetic disk as a recording medium, a rotating means for rotating the magnetic disk, and a suspension for supporting the magnetic head. A magnetic disk device comprising a magnetic head actuator having an arm to be provided, wherein at least one surface of the arm provided on the magnetic head actuator is provided with a restraining member and the arm for suppressing vibration of the arm. It is set as the structure which provided the damper material which consists of a viscoelastic material which absorbs the generated vibration.

According to the above invention, even if an excitation force is applied to the arm by the flow of air generated by the rotation of the magnetic disk, the vibration is suppressed by the restraining material of the damper material, and the vibration generated in the arm is a viscoelastic material of the damper material. Is absorbed by. For this reason, unnecessary vibration can be prevented from occurring in the arm, and accordingly, the positioning of the magnetic head by the magnetic head actuator can be performed with high accuracy, and the reliability of the magnetic disk device can be improved.

Other objects, features and advantages of the present invention will become more apparent upon reading the following detailed description with reference to the accompanying drawings.

1 is a perspective view of a magnetic disk device provided with a head actuator, which is a conventional example.

2 is a plan view of a head actuator that is a conventional example.

3 is a front view of a conventional head actuator.

4 is a view showing the vibration characteristics of a conventional head actuator.

Fig. 5 is a perspective view of a magnetic disk device provided with a head actuator as a first embodiment of the present invention.

6 is a plan view of a head actuator as a first embodiment of the present invention.

7 is a front view of a head actuator as a first embodiment of the present invention.

FIG. 8 is a cross-sectional view taken along the line X1-X1 in FIG. 6.

9 is a view showing the vibration characteristics of the head actuator as the first embodiment of the present invention.

Fig. 10 is a plan view of a head actuator as a second embodiment of the present invention.

11 is a front view of a head actuator as a second embodiment of the present invention.

Fig. 12 is a sectional view of the vicinity of the weight reducing hole of the head actuator as the third embodiment of the present invention.

Fig. 13 is a front view of a head actuator as a fourth embodiment of the present invention.

Fig. 14 is a sectional view of a head actuator as a fourth embodiment of the present invention.

Fig. 15 is a plan view of a head actuator as a fifth embodiment of the present invention.

16 is a front view of a head actuator as a fifth embodiment of the present invention.

Fig. 17 is an enlarged plan view showing the vicinity of the weight reducing hole of the head actuator as the fifth embodiment of the present invention.

18 is a plan view of a head actuator as a sixth embodiment of the present invention.

It is sectional drawing along the X2-X2 line in FIG.

It is sectional drawing for demonstrating the fixing structure of the tail part in the past.

Fig. 21 is an enlarged plan view showing the vicinity of the weight reducing hole of the head actuator as the seventh embodiment of the present invention.

Best Mode for Carrying Out the Invention Embodiments of the present invention will be described below based on the drawings.

Fig. 5 shows a magnetic disk device 20 equipped with a head actuator 30A which is a first embodiment of the present invention. 5 shows a state in which the cover is removed.

The magnetic disk device 20 is configured to have a housing 22, a magnetic disk 23, an actuator for a magnetic head (hereinafter referred to as a head actuator) 30A, a voice coil motor 25, and so forth. .

The housing 22 protects each of the above-described components 23, 25, 30A and the like by attaching a cover (not shown) and prevents dust from entering the device from the outside. In addition, the magnetic disk 23 rotates at a high speed at a predetermined rotational speed (for example, 10,000 rpm and 15,000 rpm) by a spindle motor not shown in the figure.

As shown in FIG. 6 and FIG. 7, the head actuator 30A has an E-block 34 provided with a plurality of actuator arms 26 (five in the illustrated example). In addition, the shaft hole 32 through which the shaft 28 inserted in the housing 22 is inserted is formed in the substantially center of this E-block 34 planar state. Moreover, the coil 33 which comprises a part of the voice coil motor 25 is arrange | positioned on the opposite side to the arrangement position of the actuator arm 26 with this axial hole 32 interposed.

The actuator arm 26 is a plate member made of aluminum and is provided on the E-block 34. A suspension attachment portion 31 is formed at the tip end of each actuator arm 26, and a suspension 27 on which a magnetic head is mounted is attached to the suspension attachment portion 31. As shown in FIG. Normally, the suspension 27 (not shown in FIGS. 6 and 7) is fixed to the suspension attachment portion 31 by caulking.

In addition, the actuator arm 26 is provided with an elongated oval-shaped weight reducing hole 35 by reducing the weight. Here, the weight reduction means thinning the actuator arm 26 in its thickness direction (up and down direction in FIG. 7) to form a thin portion, and forming a hole penetrating up and down the actuator arm 26. (In this embodiment, the example which made the weight reduction hole 35 the hole which penetrated up and down is shown.).

By forming the weight reducing hole 35 in this way, the weight of the actuator arm 26 can be reduced, so that the moment of inertia of the actuator arm 26 can be made small, so that the high speed access of the head actuator 30A can be achieved. We can plan. However, by forming the weight reducing hole 35 formed by the recessed part or the hole in the actuator arm 26, it becomes easy to be influenced by the flow of the air which arises by rotating the magnetic disk 23 at high speed. That is, the actuator arm 26 tends to generate aerodynamic excitation.

The voice coil motor 25 is formed by a coil 33 provided in the head actuator 30A, a magnet for generating magnetic force (not shown), a yoke 25a for applying the magnetic force to the coil 33, or the like. Consists of. The magnet is configured so that the generated magnetic force penetrates the coil 33, so that the force that rotates around the shaft 28 is generated in the head actuator 30A by varying the strength of the current supplied to the coil 33. do. Accordingly, the head actuator 30A is rotated about the shaft 28 so that the magnetic head disposed through the suspension 27 at the tip of the actuator arm 26 is positioned at a predetermined position on the magnetic disk 23. Move it.

Next, the damper material 40A will be described. The damper material 40A (indicated by a checkered pattern in FIGS. 5 and 6) is widely disposed in this embodiment from the position at which the suspension attachment portion 31 of the actuator arm 26 is formed to the vicinity of the position at which the shaft hole 32 is formed. It is made up of. Therefore, the damper material 40A is formed including the formation position of the weight reduction hole 35. Thereby, the damper material 40A becomes the structure which closed the weight reduction hole 35. As shown in FIG. Moreover, in this embodiment, as shown in FIG. 7, the damper material 40A is arrange | positioned only on one side of the actuator arm 26. As shown in FIG.

FIG. 8: shows the cross section which followed the X1-X1 line in FIG. As shown in the same figure, the damper material 40A has the structure which laminated | stacked the restraining material 41 and the viscoelastic material 42. As shown in FIG. The restraint material 41 is formed of the material which is higher in rigidity than aluminum which is the material of the actuator arm 26. As shown in FIG. Specifically, in this embodiment, the restraint material 41 is comprised by the stainless plate of 50 micrometers in thickness (Moreover, the thickness of the actuator arm 26 is 0.9 mm).

In addition, the viscoelastic material 42 is a double-sided adhesive tape (for example, VEM: brand name) of thickness 50micrometer. Specifically, the adhesive is applied to both surfaces of the resin tape serving as the base. Therefore, the restraining material 41 is fixed to the actuator arm 26 by the viscoelastic material 42. In addition, since the viscoelastic material 42 serves as a base material, the viscoelastic material 42 also functions as a damper that absorbs vibration due to the elasticity of the resin tape.

In this way, the magnetic disk 23 is provided by mounting the damper material 40A having a complex structure between the restraining material 41 having a high rigidity and the viscoelastic material 42 having a vibration absorbing function to the actuator arm 26. Even if the excitation force is applied to the actuator arm 26 by the flow of air generated by the rotation of the damper material, the damper material 40A increases the rigidity of the actuator arm 26 and the vibration generated in the actuator arm 26 Is absorbed.

Specifically, the vibration generated in the actuator arm 26 by the aerodynamic excitation force is suppressed by the restraining material 41 of the damper material 40A, and nevertheless the vibration generated in the actuator arm 26 is suppressed by the damper material ( It is absorbed by the viscoelastic material 42 of 40A). For this reason, unnecessary vibration can be prevented from occurring in the actuator arm 26, so that the positioning of the magnetic head by the head actuator 30A can be performed with high accuracy. In addition, the reliability of the magnetic disk device 20 using this head actuator 30A can be improved.

As described above, in the present embodiment, the damper material 40A is disposed at a position including the position at which the weight reducing hole 35 is formed. By setting it as this structure, the unnecessary vibration which generate | occur | produced due to the weight reduction hole 35 can be suppressed.

That is, in the conventional structure shown in FIGS. 1-3, since the weight reduction hole 15 was exposed, the flow of air flows into this weight reduction hole 15, and the actuator arm 6 is excited and an unnecessary vibration generate | occur | produces. Was doing.

However, the damper material 35 is blocked by the damper material 40A by disposing the damper material 40A at the position including the position where the weight reduction hole 35 of the actuator arm 26 is formed as in the present embodiment. . For this reason, unnecessary vibration generated by the flow of air into the weight reduction hole 35 can be suppressed.

9 shows the NRRO spectrum of the actuator arm 26 in which the damper material 40A used in the above-described embodiment is disposed. Moreover, in the same figure, the NRRO spectrum of the conventional actuator arm 6 shown in FIG. 4 is also shown for comparison.

In Fig. 9, attention is paid to the characteristics of frequencies of about 7.6 kHz and about 12.0 kHz (indicated by arrows A and B) at which natural vibrations are excited due to air excitation. Then, at 7.6 kHz, it is understood that the peak has occurred as shown by arrow a2 in the related art, so that the vibration does not occur as shown by arrow a1 by providing the damper material 40A as in the present embodiment. .

In addition, it is understood that the peak was generated even at 12.0 kHz as indicated by the arrow b2 in the prior art, and the vibration does not occur as shown by the arrow b1 by providing the damper material 40A as in the present embodiment. Thus, it is understood from FIG. 9 also that the damper material 40A is disposed on the actuator arm 26, whereby the vibration of the actuator arm 26 due to air excitation is suppressed.

In addition, although the damper material 40A was provided in the whole of the some actuator arm 26 in the said 1st Example, the damper material 40A does not necessarily need to be provided in all the actuator arm 26, It is good also as a structure arrange | positioned only in the actuator arm 26 with a large influence of air excitation.

Next, a second embodiment of the present invention will be described.

10 and 11 show a head actuator 30C as a second embodiment. In the first embodiment described above, the damper material 40A is arranged in almost all regions of the actuator arm 26.

On the other hand, in this embodiment, the damper material 40B is provided in the actuator arm 26 partially. Specifically, in the present embodiment, the actuator arm 26 located at the top of FIG. 11 and the damper material 40B disposed at the actuator arm 26 located at the bottom thereof are arranged on the other actuator arm 26. It was made small compared with 40 A of damper materials used.

Accordingly, the actuator arm 26 in which the damper material 40B is formed has a configuration in which less than about half of the actuator arm 26 is covered by the damper material 40B, as shown in FIG. In this manner, the damper material does not necessarily need to be disposed on the front surface of the actuator arm 26 but may be configured to be partially provided on the actuator arm 26. Thus, by providing the damper material 40B to the actuator arm 26 partially, it becomes possible to adjust a dustproof effect by the position and area where the damper material 40B is installed.

Next, a third embodiment of the present invention will be described.

12 shows a head actuator 30D which is a third embodiment. In each of the above-described embodiments, the viscoelastic material 42 constituting the damper materials 40A and 40B is also provided at a position facing the weight reducing hole 35.

On the other hand, in this embodiment, the removal part 37 is formed by removing the viscoelastic material 42 in the position which opposes the weight reduction hole 35 of the damper material 40C. This configuration can prevent the dust penetrating into the weight-reduction hole 35 at the time of assembly from joining the viscoelastic material 42, thereby increasing the reliability of the magnetic disk device into which the head actuator 30D is inserted. have.

That is, the weight reduction hole 35 which is a recess or a hole is easy to invade dust, and when the viscoelastic material 42 (equivalent to adhesive) is provided in the position which opposes this weight reduction hole 35, it is a weight reduction hole. Dust penetrating into 35 is bonded to the viscoelastic material 42. When the head actuator is assembled to the magnetic disk device in this state, it is conceivable that the dust will be separated from the viscoelastic material 42 over time and float in the magnetic disk device. In this way, when the dust peeled off from the viscoelastic material invades the magnetic disk 23 and the magnetic head or the like, it is obvious that the recording / reproducing characteristic is greatly deteriorated and the reliability of the magnetic disk device is deteriorated.

However, as in the present embodiment, dust is not adhered to the viscoelastic material 42 by removing the viscoelastic material 42 at the position opposite to the weight reducing hole 35 to form the removal portion 37. For this reason, even after the head actuator 30D is inserted, the inside of the magnetic disk device can be kept clean, and thus the reliability of the magnetic disk device can be improved.

Next, a fourth embodiment of the present invention will be described.

13 and 14 show a head actuator 30E as a fourth embodiment. In this embodiment, the damper material 40A is symmetrically arranged on both sides of the actuator arm 26. Specifically, 40 A of the same shape damper material is arrange | positioned on the upper surface and lower surface of each actuator arm 26 on the same conditions.

With the configuration of this embodiment, since the damper material 40A is symmetrically disposed on both sides of the actuator arm 26, the balance of the actuator arm 26 is good, and unnecessary vibration is generated in the actuator arm 26. Can be more effectively suppressed.

Next, a fifth embodiment of the present invention will be described.

15 and 16 show a head actuator 30F as a fifth embodiment. In each of the above embodiments, the damper materials 40A to 40C are arranged on the upper or lower surface of the actuator arm 26. In contrast, in the present embodiment, the damper material 40D is disposed on the side surface 26a of the actuator arm 26. This damper material 40D is the same structure as the other damper materials 40A-40C mentioned above, and is comprised by the restraining material 41 and the viscoelastic material 42 as expanded to FIG.

By the way, the aerodynamic excitation force applied to the actuator arm 26 by rotating the magnetic disk 23 is not only applied to the directions of arrows Z1 and Z2 in FIG. 16, but also in the plane direction of the actuator arm 26, that is, the arrow in FIG. 15. It is also applied in the Y1 and Y2 directions. In order to suppress the aerodynamic excitation force applied to the arrow Z1 and Z2 in FIG. 16, it is effective to provide damper materials 40A-40C on the upper surface and lower surface of the actuator arm 26 as shown in each said Example. However, in this structure, it cannot fully suppress this about the aerodynamic excitation force applied to arrow Y1, Y2 direction.

For this reason, in the present Example, damper material 40D was arrange | positioned at the side surface 26a of the actuator arm 26. As shown in FIG. As a result, vibrations can be prevented from occurring in the actuator arm 26 due to the aerodynamic excitation force applied in the directions of arrows Y1 and Y2. Therefore, occurrence of unnecessary vibration in the plane of the actuator arm 26 can be suppressed. have.

In addition, in this embodiment, although the damper material 40D was provided only in the side surface 26a of the actuator arm 26, the damper material 40A-40C was provided on the upper and lower surfaces of the actuator arm 26 with this. Of course, the configuration may be installed.

Next, a sixth embodiment of the present invention will be described.

18 and 19 show a head actuator 30G as a sixth embodiment. As shown in FIG. 18, the suspension 27 in which the magnetic head 38 is arrange | positioned is fixed to the front-end | tip of the actuator arm 26. As shown in FIG.

The magnetic head 38 is configured to be drawn out to the side of the E-block 34 via the suspension 27 and the actuator arm 26 using flexible wiring (hereinafter, referred to as FPC). The FPC is bonded to the suspension 27 to form an integrated structure. By the way, the part (namely, the part arrange | positioned to the actuator arm 26) extended from the suspension 27 of FPC is called the tail part 39 of the suspension 27. As shown in FIG.

As shown in FIG. 20, this tail portion 39 is conventionally formed with a groove portion 9 on the side of the actuator arm 6, and is inserted into the groove portion 9 to wire from the suspension to the E-block. It was supposed to be. However, in this structure, the tail part 39 (flexible wiring) was pressed by aerodynamic excitation, and the phenomenon which the vibration generate | occur | produced in the actuator arm 6 has arisen as a result.

Therefore, in the present embodiment, as shown in an enlarged view in FIG. 19, the flange portion 45 is formed by extending the damper material 40E laterally than the actuator arm 26, and the tail portion 39 is formed on the flange portion 45. )). That is, by forming the flange part 45 which extends laterally from the actuator arm 26 in the damper material 40E, the lower surface of this flange part 45 is in the state which the viscoelastic material 42 exposed.

In this embodiment, the tail portion 39 is bonded to the exposed viscoelastic material 42. As a result, the tail portion 39 is attached to the actuator arm 26 using the viscoelastic material 42.

This configuration eliminates the need to separately provide a configuration (groove 9) for fixing the tail portion 39 to the actuator arm 26 as in the prior art, thereby simplifying the configuration of the head actuator 30G. Can be. In addition, since the tail portion 39 is fixed to the damper member 40E having the restraining material 41 having high rigidity, even if an aerodynamic excitation force is applied, unnecessary vibration is caused to the actuator arm 26 due to the tail portion 39. It can be prevented from occurring.

Next, a seventh embodiment of the present invention will be described.

Fig. 21 shows a head actuator 30H as a seventh embodiment. In the present embodiment, the opening 46 is formed at a position facing the weight reducing hole 35 of the damper material 40F. Therefore, the restraint material 41 and the viscoelastic material 42 do not exist in the position which opposes the weight reduction hole 35 of the damper material 40F.

When the aerodynamic excitation force to the actuator arm 26 due to the flow of air passing through the weight reducing hole 35 due to the rotational speed of the magnetic disk 23 is small, the opening 46 is also applied to the damper material 40F as in the present embodiment. ), The moment of inertia of the actuator arm 26 including the damper material 40F can be reduced. Moreover, since the rigidity becomes high by the damper material 40F in the site | parts other than the formation position of the weight reduction hole 35 of the actuator arm 26, generation | occurrence | production of a vibration can be suppressed. This makes it possible to achieve both high-speed seek processing and high-precision positioning processing in the movement processing of the magnetic head.

Claims (12)

In the magnetic head actuator provided with a suspension for supporting the magnetic head, and having an arm for moving the magnetic head by being driven, An actuator for magnetic head, wherein a damper material is provided on at least one side of the arm to increase the rigidity of the arm and absorb the vibration generated in the arm. In the magnetic head actuator provided with a suspension for supporting the magnetic head, and having an arm for moving the magnetic head by being driven, An actuator for magnetic head having a configuration in which at least one surface of the arm is provided with a damping material comprising a restraining material for suppressing the vibration from occurring in the arm and a viscoelastic material for absorbing the vibration generated in the arm. The actuator for magnetic head according to claim 1 or 2, wherein the damper material is symmetrically arranged on both sides of the arm. The said arm is provided with the weight reduction part which reduces a weight, The actuator for magnetic head, wherein the damper material is disposed at a position including a position where the weight reducing portion is formed. The actuator for magnetic head according to claim 1 or 2, wherein the damper material is partially provided on the arm. The actuator for magnetic head according to claim 2, wherein the restraint material is formed of a material having a rigidity higher than that of aluminum. The actuator for magnetic head according to claim 6, wherein the restraint material is formed of a stainless material. 3. The arm according to claim 2, wherein a weight reduction portion for reducing weight is provided on the arm, and the damper material is disposed at a position including a position where the weight reduction portion is formed. An actuator for magnetic head, wherein the viscoelastic material at a position facing the weight reducing portion is removed. The said arm is provided with the weight reduction part which reduces a weight, and arrange | positions the damper material in the position containing the formation position of the said weight reduction part, An actuator for a magnetic head, wherein an opening is formed at a position facing the weight reducing portion of the damper material. The magnetic head actuator according to claim 2, wherein the tail of the suspension is attached to the arm using the viscoelastic material. A magnetic disk as a recording medium, Rotating means for rotating the magnetic disk, A magnetic disk apparatus comprising a magnetic head actuator provided with a suspension for supporting a magnetic head and provided with an arm for moving the magnetic head by being driven. A magnetic disk apparatus having a structure in which a damper material is provided on at least one surface of the arm provided in the magnetic head actuator. A magnetic disk as a recording medium, Rotating means for rotating the magnetic disk, A magnetic disk apparatus comprising a magnetic head actuator provided with a suspension for supporting a magnetic head and provided with an arm for moving the magnetic head by being driven. A magnetic disk provided with at least one surface of the arm provided in the magnetic head actuator provided with a damping material comprising a restraining material for suppressing the vibration from occurring in the arm and a damper material for absorbing the vibration generated in the arm. Device.

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