JP2000260140A - Magnetic head positioning mechanism and its driving system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-speed and highly accurate magnetic head positioning mechanism and its driving method. SOLUTION: This magnetic head positioning mechanism is provided with a fine actuator section 6 having a magnetic head supporting mechanism 5 for supporting a slider 2 having a magnetic head 1 loaded therein and a magnetic head supporting mechanism holding part 30 for holding the magnetic head supporting mechanism 5, and a coarse actuator section 7 joined to the fine actuator section 6 and having a holder arm 11 supported so as to be swung. The coarse actuator section 7 is provided with a first driving means 12 for swinging the holder arm 11 in a seeking direction, and the fine actuator section 6 is provided with a second driving means 16 for swinging a magnetic head 1 in the seeking direction by a very small amount independently of the swinging motion of the holder arm 11. The finer actuator section 6 is also provided with a vibration suppressing means 32 for suppressing vibration generated in the holder arm 11 of the coarse actuator 7 following the swinging motion of the magnetic head supporting mechanism 5 in the fine actuator section 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic head positioning mechanism in a disk device such as a magnetic disk device or an optical disk device, and a driving method thereof.

[0002]

2. Description of the Related Art The recording density of a magnetic disk drive is high BP.
Due to the introduction of I (Bit Per Inch) and high TPI (Track Per Inch), it is increasing at an annual rate of 60% or more. High BPI
To reduce the head flying height and reduce the MR (Magneto Re
Highly sensitive magnetic heads such as sistive) heads or highly efficient signal processing technology are required. However, in order to achieve high TPI, it is important to improve the positioning accuracy of the magnetic heads. Becomes

For example, when the recording density is 1 Gb / in ² ,
The track direction density is 8 kTPI or less, and the track pitch is about 3 to 4 μm. To achieve a recording density of 10 Gb / in ² or more, the track density is 25 kTP.
Since the track pitch is 1 μm or less,
The positioning accuracy of the magnetic head is 10% of the track pitch.
0.1 μm or less is required.

FIGS. 9 and 10 show a conventional example of a magnetic head positioning mechanism (positioner) used in a magnetic disk drive. This magnetic head positioning mechanism is called a rotary actuator system that drives the magnetic head to rotate in an arc shape, and includes a plurality of holder arms 11 and an arm block (carriage) 13 having a movable coil 12. Is rotatable in the direction of arrow A (see FIG. 9B).

A magnetic head supporting mechanism 5 (suspension or HG) for supporting the slider 2 on which the magnetic head 1 is mounted is provided at the tip of the holder arm of the arm block 13.
A: Head Gimbal Assembly) is connected (Fig. 10).
(See (a) to (c)). In addition, the arm block 1
The movable coil 12 installed at the other end of the third coil 3 is combined with an external fixed magnetic circuit 15 to form a VCM (Voice Coil Motor).
And a driving force is generated by applying a predetermined driving current to the movable coil 12 to drive the magnetic head support mechanism 5 to rotate in a seek direction (arrow A in FIG. 9B) along an arc orbit. Then, the magnetic head 1 is positioned at a target track on the medium.

The positioning operation referred to here is a seek operation (tracking) for moving the magnetic head from an arbitrary track position to a target track position, and a follow operation (following operation) for keeping the magnetic head following the target track. Ing). Since the conventional magnetic head positioning mechanism drives a plurality of magnetic heads simultaneously with one VCM, the positioning accuracy, especially the track following accuracy in following, is not sufficient.
It is becoming impossible to cope with a high TPI device requiring the following narrow track pitch.

[0007] Therefore, research on a two-stage actuator for individually driving each magnetic head independently of the carriage drive by the VCM has been conducted. These two-stage actuators can be roughly classified into three types depending on the parts to be individually driven. That is, a head element driving system for individually driving the magnetic head unit (FIG. 11A) and a slider driving system for individually driving the slider unit (FIG. 11A).
(B)) and an HGA drive system (FIGS. 12 to 12) for individually driving the magnetic head support mechanism (HGA).

The head element driving method shown in FIG. 11A employs a micro-machine technology to apply an electrostatically driven linear actuator A having a comb-tooth structure in a slider A1.
Although the magnetic head A3 is directly micro-driven by embedding 2, the yield is poor due to the high processing difficulty, and there is a drawback that it is easily displaced or destroyed when an impact is applied in the movable direction, and it has yet to be put to practical use. Not in. FIG.
In FIG. 1A, A4 is a magnetic head support mechanism (suspension).

The slider driving method shown in FIG.
Although it has a structure in which a silicon micro-gimbal B1 and a planar type electromagnetically driven piggyback microactuator B2 are combined, there is a problem that a sufficient driving force cannot be obtained because a coil pattern layer for generating an induced magnetic field cannot be processed to be thick. ing. Finally, FIGS. 12 to 1
The HGA driving method shown in FIG. 4 is a force-acceleration type (high compliance type: FIGS. 12 and 13) depending on whether the generated force of the HGA driving actuator is proportional to the acceleration or displacement of the magnetic head. And a force-displacement type (high stiffness type: FIG. 14).

The force-acceleration type (high compliance type) two-stage actuator shown in FIGS.
Japanese Patent Application No. 9-260680 filed by the present applicant.
And a magnetic head positioning mechanism disclosed in the specification of Japanese Patent Application Laid-Open No. H11-157, in which a magnetic head supporting mechanism (suspension:
The actuator spring 8 is connected to the holder arm 11 by a shaft.

At this time, a small VCM 20 composed of a permanent magnet 17, a small coil 19 and a yoke 18 is provided between the holder arm 11 and the actuator spring 8.
And a small coil 19 when following the track
The magnetic head support mechanism 5 is configured to be minutely rotated by applying a predetermined current to the actuator to generate an electromagnetic force to bend the actuator spring 8 fixed to the holder arm.

On the other hand, the force-displacement type (high stiffness type) two-stage actuator shown in FIG.
Japanese Patent Application No. 10-35569 filed by the present applicant.
No. 7 relates to a magnetic head positioning mechanism disclosed in the specification, in which the magnetic head support mechanism 5 is connected to an actuator spring 8, and the actuator spring 8
Is completely fixed to the holder arm 11. At this time, as shown in FIGS. 15 and 16, a pair of piezoelectric elements 16 are arranged in the actuator spring 8 in parallel along the longitudinal center axis of the magnetic head support mechanism. At the time of track following, a predetermined voltage is alternately applied to a pair of piezoelectric elements to generate a driving force to bend the actuator spring 8 fixed to the holder arm, thereby driving the magnetic head supporting mechanism 5 to rotate minutely. .

[0013]

Since the two-stage actuator of the HGA drive system can be easily constructed without making a significant change to the conventional HGA,
At present, it is expected as a high-precision head positioning mechanism that is the most practically available. FIG. 17A shows FIG.
4 shows an analysis model of the force-displacement type (high stiffness type) two-stage actuator indicated by. Only one actuator spring connected to the magnetic head support mechanism is connected to the single-plate holder arm. FIG. 17B shows the frequency characteristics of this model.

The broken line in FIG. 17B shows the frequency characteristics when the two-stage actuator is vibrated by the VCM in the rotary bearing, and shows the vibration characteristics during the seek operation (tracking: when the coarse actuator is driven).
The bold line in FIG. 17B shows the frequency characteristics when only the piezoelectric element (PZT) provided in the fine actuator section (actuator spring section) of the two-stage actuator is driven. : When the fine actuator is driven).

On the other hand, the thin line in the figure shows the frequency characteristic when the actuator spring is completely fixed at the position where the holder arm is connected and the piezoelectric element (PZT) is driven, using the model of the fine actuator only. 6 shows the vibration characteristics of the unit alone. Even in the model in which the fine actuator unit alone had only one resonance peak at 8.2 kHz (the thin line in FIG. 17B), when connected to the holder arm, the same PZT drive condition (track following operation condition) was applied but VCM drive was performed. (During seek operation: broken line in FIG. 17B).
It can be seen that there are two resonance peaks at 8 kHz and 9.5 kHz (thick line in FIG. 17B).

As can be seen from the mode shape shown in FIG.
Is a sway mode (hereinafter, arm-coupled sway mode) of the fine actuator coupled with the vibration of the holder arm, and the resonance of 9.5 kHz is an off-track mode due to the secondary torsional vibration of the suspension. .

In the model in which only one fine actuator is connected to the holder arm such as the uppermost and lowermost parts of the carriage block, the above characteristics are exhibited. A model in which two fine actuators are connected (see FIG. 18A) shows more complicated vibration characteristics.

FIG. 18B shows the frequency characteristics at this time. The broken line shows the frequency characteristic when the VCM is applied to the rotary bearing of the holder arm, and shows the vibration characteristic during the seek operation (tracking: when the coarse actuator is driven). The thick line shows one of the two fine actuators of PZT. This is a frequency characteristic when driven, and shows a vibration characteristic during a following operation (by an arbitrary magnetic head) (following: when driving a fine actuator).

When two fine actuators are connected to the holder arm, such as the middle position of the carriage block, the vibration characteristics (PZT
Drive), the resonance peak increases by one and three (5.1 kHz,
8.1 kHz, 9.6 kHz). As can be seen from the mode shape shown in FIG. 15C, the three resonances are 5.8 kHz resonance and 9.6 kHz.
The resonance at kHz is the arm-coupled sway mode and the suspension secondary twist, while the resonance at 8.1 kHz is a fine actuator sway mode in which the upper and lower suspensions intersect.

These two or three resonances appearing when the PZT is driven in the arm-assay model are represented by PZT
HGA driving force at the tip of the holder arm (connection position with the fine actuator) (hereinafter referred to as PZ)
It is considered that this acts as a source of vibration to excite the holder arm vibration (see FIGS. 19 and 20).

During track following (during PZT driving), the resonance peak of the head positioning mechanism system has a high frequency (10 Hz).
kHz) and a low frequency (5 kHz), the servo control band cannot be widened, so that the positioning accuracy is remarkably deteriorated. Also, when the resonance peak becomes three as in the case of the middle vibration characteristic of the carriage arm, it is necessary to arrange three notch filters in series, and the control band is set to a frequency close to these resonances. In such a case, since the phase is significantly delayed in the frequency band, the stability margin is reduced, and it becomes difficult to mount a practical controller.

Other known examples of a magnetic head positioning mechanism are disclosed in Japanese Patent Application Laid-Open No. 5-341787,
Japanese Patent No. 529,380 and Japanese Patent No. 271,599 describe a magnetic head positioning mechanism provided with a two-stage actuator. However, such a magnetic head positioning mechanism includes a two-stage actuator. There is no description about a technique for suppressing the vibration phenomenon in the course actuator portion.

An object of the present invention is to solve the above-mentioned disadvantages of the prior art, and an object of the present invention is to provide a magnetic disk drive having a high recording density exceeding 10 Gb / in ² and a track density of 25 kTPI. It is an object of the present invention to provide a high-speed and high-precision magnetic head positioning mechanism capable of following a track even at the above narrow track pitch (track pitch of 1 μm or less) and securing a servo band of 3 kHz or more, and a driving method thereof.

[0024]

In order to achieve the above-mentioned object, the present invention employs the following basic technical structure. That is, as a first aspect of the magnetic head positioning mechanism of the present invention, a magnetic head supporting mechanism configured to support a slider on which a magnetic head is mounted and a magnetic head supporting mechanism holding the magnetic head supporting mechanism A magnetic actuator positioning mechanism comprising a fine actuator section having a section, and a course actuator section having a holder arm joined to the fine actuator section and pivotally supported around a predetermined rotation axis. The course actuator unit has a first drive unit for swinging the holder arm in the seek direction around the rotation axis,
On the other hand, the fine actuator section is provided with a second drive means for swinging the magnetic head by a very small amount in the seek direction independently of the swing movement of the holder arm in the course actuator section. And furthermore,
The fine actuator section is provided with vibration suppressing means for suppressing vibration generated in the holder arm of the course actuator section in accordance with the swinging movement of the magnetic head support mechanism in the fine actuator section. According to a second aspect of the present invention, there is provided a magnetic head supporting mechanism configured to support a slider on which a magnetic head is mounted, and a magnetic head supporting mechanism for holding the magnetic head supporting mechanism. A magnetic head positioning system comprising: a fine actuator unit having a mechanism holding unit; and a course actuator unit joined to the fine actuator unit and having a holder arm pivotally supported around a predetermined rotation axis. A mechanism, wherein the course actuator section includes the holder The fine actuator has a first driving means for swinging the arm in the seek direction about the rotation axis, while the fine actuator has a swinging motion of the holder arm in the course actuator. In a magnetic head positioning mechanism provided with a second driving means for swinging the magnetic head in the seek direction by a small amount independently of the fine actuator, a vibration suppressing means is provided in the fine actuator section, This is a method for driving a magnetic head positioning mechanism configured to suppress vibration generated in the holder arm of the course actuator unit in accordance with the swinging movement of the magnetic head support mechanism in the actuator unit.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The magnetic head positioning mechanism and the method of driving the magnetic head positioning mechanism according to the present invention employ the above-described technical configuration. The head positioning mechanism includes a magnetic head support mechanism and a two-stage actuator. The magnetic head support mechanism is configured to support a slider on which a magnetic head is mounted, and the two-stage actuator magnetically controls the magnetic head support mechanism. A fine actuator section for displacing a minute amount in the seek direction of the head; and a course actuator section for displacing the plurality of fine actuator sections in the seek direction of the magnetic head at a time by VCM. Thin-plate actuator supporting magnetic head support mechanism Comprising a spring and two piezoelectric elements, and applying a voltage alternately to the two piezoelectric elements to generate a driving force on the two piezoelectric elements, thereby elastically bending the actuator spring portion. A high-stiffness HGA drive system in which the magnetic head is minutely driven in a seek direction, or a thin plate-shaped actuator spring supporting the magnetic head support mechanism, a small coil and a yoke, and a holder arm A magnetic head is formed by forming a small VCM with a permanent magnet embedded in the actuator, generating an electromagnetic force in the small VCM by applying a current to the small coil, and elastically bending the actuator spring portion. It is configured with a high-compliance HGA drive system that performs minute drive in the seek direction A fine actuator having a dummy mass equivalent to the equivalent mass of the magnetic head support mechanism mounted on the side of the carriage block opposite the HGA drive type fine actuator section with the holder arm interposed therebetween. (Dummy actuator) is connected.

In addition, as a more specific example of a method of driving the magnetic head positioning mechanism according to the present invention, a magnetic head constituted by, for example, the coarse actuator and the fine actuator during track following. A plurality of positioning mechanism units are integrated in parallel with each other and concentrically with each other in an arm block portion provided in a holder arm of each magnetic head positioning mechanism unit and forming an opening to be fitted to a predetermined rotation axis. When the HGA is driven using a magnetic head supporting mechanism holding part provided with a fine actuator part in an arbitrary magnetic head positioning mechanism unit using a magnetic head positioning mechanism that is integrated and integrally assembled,
In the magnetic head positioning mechanism unit in the middle of the arm block, the magnetic head positioning mechanism unit functions as another vibration suppressing unit connected to the opposite side with the holder arm interposed therebetween, but actually stores information on the recording medium. Write,
The other magnetic head support mechanism holding portion, which can read information from the recording medium, is always moved with the same force in the direction opposite to that of the fine actuator (piezoelectric element (P
In the case of a fine actuator driven by ZT) drive, an opposite-phase voltage is applied, and in the case of a fine actuator driven by a small VCM drive, an opposite current is applied.
Similarly, using a magnetic head supporting mechanism holding portion connected to a holder arm of the magnetic head positioning mechanism unit disposed at both ends of the arm block,
When the GA is driven, the driving means of the dummy member mounted on the dummy mass connected to the opposite side with the holder arm interposed therebetween is always the same force in the direction opposite to the magnetic head support mechanism holding portion (piezoelectric). In the case of a fine actuator driven by an element (PZT), it is characterized in that it is driven by applying an opposite-phase voltage in the case of a fine actuator driven by a small VCM, and in the opposite direction in the case of a fine actuator driven by a small VCM.

Thus, when an arbitrary fine actuator is driven during track following, the HGA driving reaction force acting on the connection between the actuator spring and the holder arm is reduced by two fine actuators (middle carriage). Alternatively, the excitation force acting on the tip end of the holder arm can be canceled out by the opposing HGA driving reaction forces of one fine actuator and one dummy actuator (both ends of the carriage), and the HGA can be canceled. High-speed, high-precision track following operation (following) of the magnetic head because resonance due to holder arm vibration during driving can be suppressed and good vibration characteristics without resonance peaks up to a high frequency band can be obtained. Can be performed.

[0028]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a magnetic head positioning mechanism according to an embodiment of the present invention; That is, FIG.
1A and 1B are a cross-sectional view and a plan view illustrating the configuration of a specific example of a magnetic head positioning mechanism according to the present invention. In the drawing, a magnetic head supporting mechanism configured to support a slider 2 on which a magnetic head 1 is mounted. 5, a fine actuator unit 6 having a magnetic head support mechanism holding unit 30 for holding the magnetic head support mechanism 5, and a shaft that is joined to the fine actuator unit 6 and that can swing around a predetermined rotation axis 31. A magnetic head positioning mechanism 100 comprising a course actuator unit 7 having a supported holder arm 11, wherein the course actuator unit 7 swings the holder arm 11 in the seek direction around the rotation shaft 31. First driving means 12 for causing
And the fine actuator section 6
The magnetic head 1 is independent of the swinging motion of the holder arm 11 in the course actuator section 7.
Drive means 1 for oscillating a small amount in the seek direction
6 is further provided in the fine actuator section 6 in accordance with the swinging movement of the magnetic head support mechanism 5 in the fine actuator section 6.
The holder arm 1 of the course actuator unit 7
1 shows a magnetic head positioning mechanism 100 provided with a vibration suppressing means 32 for suppressing vibration generated in the magnetic head positioning mechanism 100.

In the present invention, the vibration suppressing means 32
Restricts a plurality of resonance frequencies generated in the holder arm 11 of the course actuator unit 7 to one with the swinging movement of the magnetic head support mechanism 5,
In addition, it is desirable that the device has a function of moving the resonance frequency to a higher frequency band side. Further, the first driving means 12 provided in the course actuator section 7 according to the present invention is preferably a voice coil motor, and the second driving means 12 provided in the fine actuator section 6 is preferably used. It is desirable that the driving means 16 is constituted by one selected from a voice coil motor or a piezoelectric element.

Next, the configuration of the magnetic head positioning mechanism according to the present invention will be described in more detail. In FIG. 1, the magnetic head positioning mechanism 100 includes a magnetic head support mechanism 5, a fine actuator section 6, and a course. And a two-stage actuator composed of an actuator unit 7.
In this case, the magnetic head supporting mechanism 5 is connected to the magnetic head supporting mechanism via a narrow spring member 27 provided at least between the magnetic head supporting mechanism 5 and the actuator spring section 8 formed in the magnetic head supporting mechanism holding section 30. It is preferable that the narrow-width spring member 27 is bonded to the mechanism holding unit 30 and is configured to be deformed by the second driving unit 16, for example, the piezoelectric element 160.

Further, in this embodiment, the magnetic head supporting mechanism holding section 30 is connected to the holder arm 11 constituting the course actuator section 7 at the holder arm swaging position 10 in the figure. Further, the arm block 13 including the plurality of holder arms 11 has a movable coil at one end thereof constituting the first driving means 12, and is combined with an external fixed magnetic circuit (not shown) so that the voice coil motor V
The CM is constructed to form the course actuator section 7.

On the other hand, the magnetic head supporting mechanism 5 is a floating or contact type slider 2 on which the magnetic head 1 is mounted.
And a load beam 4 for applying a pressing force to the slider 2 and a gimbal spring 3 supporting the same. The slider 2 is connected to the phi actuator 6 at a suspension caulking position 9 with the slider 2 facing the recording medium (not shown).

The actuator spring 8 provided on the magnetic head supporting mechanism holding section 30 of the fine actuator section 6 is provided between the suspension caulking position 9 and the holder arm caulking position 10 by a second driving means. Are arranged in parallel with a direction along the longitudinal axis of the actuator spring 8 with the central axis in the longitudinal direction of the actuator spring 8 interposed therebetween.

The actuator spring 8 has S
A material having toughness such as US 304 is used, and a narrow spring portion 27 is provided between the suspension caulking position 9 and the piezoelectric element 160.
By alternately applying a voltage to the magnetic head support mechanism 5, the left and right piezoelectric elements are alternately distorted to deflect the spring portion 27, and the magnetic head support mechanism 5 is minutely driven in the seek direction.

The magnetic head positioning mechanism 100 according to the present invention may be constituted by one magnetic head positioning mechanism unit, and as shown in FIG. The head positioning mechanism unit may be concentrically multi-layered and assembled in the arm block portion. At this time, at least a part of the magnetic head positioning mechanism units excluding the magnetic head positioning mechanism units at both ends of the plurality of magnetic head positioning mechanism units constituting the arm block 13. As shown in FIG. 1A, one magnetic head positioning mechanism unit H2 and another magnetic head positioning mechanism unit H3 are vertically opposed to each other with the holder arm 11 interposed therebetween. (See the middle arm assay 25 in FIG. 1A).

As described above, when an arbitrary magnetic head support mechanism H2 in FIG. 1 is minutely driven in the seek direction, another magnetic head support mechanism H3 connected to the opposite side with the holder arm 11 interposed therebetween. And a pair of piezoelectric elements 1 constituting another second driving means 16 ′ attached to the actuator spring 8 so as to be driven at the same acceleration in the direction opposite to the one magnetic head positioning mechanism H 2.
The voltage applied to 60 ′ is controlled so that the piezoelectric element 160 has the opposite phases.

For example, a pair of piezoelectric elements 160 of a fine actuator holding the upper magnetic head support mechanism H2
When a voltage of 300 V is applied to the right piezoelectric element and a voltage of 0 V is applied to the left piezoelectric element, 0 V is applied to the right piezoelectric element of the same pair of piezoelectric elements 160 ′ of the fine actuator that holds the lower magnetic head support mechanism H 3 opposed thereto. A voltage of 300 V is applied to the left piezoelectric element.

Accordingly, when any magnetic head 1 that performs the track following operation is finely driven by the fine actuator, the other fine actuator connected on the opposite side across the holder arm 11 always has the same acceleration in the opposite direction. (HGA driving force) drives the magnetic head (see FIGS. 1 (c) and 1 (d) and FIGS. 2 (b) and 2 (c)).

At this time, the HG of the fine actuator
A (H) acting on the actuator spring connection position at the tip of the holder arm by driving the magnetic head supporting mechanism (A).
The GA drive reaction force is the upper and lower two fine actuators H
2. When H3 (the middle arm assay 25 in FIG. 1A) is constantly driven in the opposite direction and with the same acceleration (HGA driving force), the mutual HGA driving reaction force is canceled out. The exciting force acting on the holder arm tip can be canceled.

Therefore, since the holder arm vibration excited by the HGA driving reaction force of the fine actuator section as described with reference to FIGS. 17 and 18 can be suppressed, it appears at the time of track following (here, at the time of PZT driving). The three resonance peaks (thick line in FIG. 3A) can be reduced to one (thick line in FIG. 3B). As is clear from the above description of the specific example, in the magnetic head positioning mechanism 100 according to the present invention, the vibration suppressing means 32
Any device having a function of generating a force that cancels a reaction force generated in the holder arm 11 of the course actuator unit 7 due to the swing of the magnetic head 1 by the magnetic head support mechanism 5 can be used. It may have a configuration.

As a specific example, in the above specific example, the vibration suppressing means 32 is provided in the fine actuator section 6.
The swing operation of the magnetic head support mechanism 5 provided in the magnetic head support mechanism holding section 30 in the fine actuator section 6 is opposite to the swing operation of the magnetic head support mechanism 5. A swing compensating member 33 for independently performing a swinging operation in the direction is provided. As the swing compensating member 33, a slider on which the magnetic head is actually used for reading and writing information is supported. The magnetic head support mechanism or the magnetic head support mechanism holding part connected to the magnetic head support mechanism, for example, the magnetic head support mechanism is disposed adjacent to and opposed to H2.

The swing compensating member 33 preferably has a mass equivalent to that of the magnetic head supporting mechanism 5 or the magnetic head supporting mechanism holding section 30. Further, in the present invention, the swing compensating member 33 includes a swingable magnetic head supporting mechanism configured to support a slider on which the magnetic head is actually used for reading and writing information. Alternatively, the magnetic head supporting mechanism may be constituted by a magnetic head supporting mechanism holding portion joined to the magnetic head supporting mechanism, and a dummy having a mass equivalent to the magnetic head supporting mechanism or the magnetic head supporting mechanism holding portion. It may be composed of members.

Next, another specific example of the magnetic head positioning mechanism 100 according to the present invention will be described in detail with reference to FIG. That is, in this specific example, the vibration suppressing means 32 provided in the fine actuator unit 6 is used.
The dummy member 22 is used as the swing compensating member 33 constituting the above.

The basic configuration of this embodiment is the same as that of the first embodiment, so that the detailed explanation of the structure is omitted, and the parts different from those of the first embodiment are explained. I do. That is, FIGS. 4A to 4D are a side view and a plan view illustrating the configuration of the second specific example according to the present invention.

In FIG. 4, the magnetic head positioning mechanism units 23 and 24 at both ends of the arm block 13
That is, in the drawing, the uppermost or lowermost holder arm 11
The magnetic head supporting mechanism H1 or H4 included in the magnetic head supporting mechanism 5 as shown in the first specific example described above.
Is connected to the side facing the recording medium (not shown), and on the other side across the holder arm 11, as shown in FIG.
The dummy member 22 (particularly H0 or H0) having a mass corresponding to the equivalent mass of the magnetic head support mechanism H1 or H4.
Dummy actuator 21, which is another fine actuator mounted with 5), is connected to form uppermost arm assay 23 or lowermost arm assay 24.

At this time, the material and shape of the dummy mass 22 are not particularly limited as long as the dummy mass 22 is designed to be equivalent to the equivalent mass of the magnetic head support mechanism. It is desirable that the material be rigid so as not to excite an extra vibration mode. The dummy actuator 21 on which the dummy mass 22 is mounted basically has the same actuator spring as the fine actuator unit holding the magnetic head support mechanism (H1 or H4) connected to the uppermost or lowermost holder arm. 8 and a pair of piezoelectric elements 160 'as other second driving means 16'.

When the magnetic head supporting mechanism H1 or H4 connected to the uppermost or lowermost holder arm is minutely driven in the seek direction, the dummy mass 22 connected to the opposite side with the holder arm interposed therebetween, that is, H0 or H0. A voltage applied to a pair of piezoelectric elements 160 'attached to the dummy actuator 21 is applied to the magnetic head support mechanism H1 so that H5 is driven at the same acceleration in a direction opposite to that of the magnetic head support mechanism H1 or H4. Alternatively, control is performed so that the driving voltage of the piezoelectric element 160 constituting the second driving means 16 in each fine actuator unit 6 holding H4 has an opposite phase to the driving voltage.

For example, a pair of piezoelectric elements 160 of a fine actuator holding the upper magnetic head support mechanism H1
When a voltage of 300 V is applied to the right piezoelectric element and a voltage of 0 V is applied to the left piezoelectric element, the dummy member 22 on the opposite side
In the fine actuator holding the above, a voltage of 0 V is applied to the piezoelectric element on the right side of the pair of piezoelectric elements 160 ′, and a voltage of 300 V is applied to the piezoelectric element on the left side.

Thus, as shown in FIGS. 4 (b) to 4 (d) and FIGS. 5 (b) to 5 (c), the magnetic head connected to the top or bottom of the carriage is moved by the fine actuator. When the track following operation is performed by minute driving, the dummy actuator 21 connected to the opposite side of the holder arm 11 always drives the dummy mass 22 in the opposite direction with the same acceleration (driving force).

At this time, by the HGA (magnetic head support mechanism) driven by the fine actuator section at the top or bottom of the carriage, the magnetic elements disposed at both ends in the magnetic head positioning mechanism unit stacked on the arm block 13. The HGA driving reaction force acting at the actuator spring connection position at the end of the holder arm of the head positioning mechanism unit is obtained by accelerating the two upper and lower fine actuators (one of which is a dummy actuator) at equal accelerations (HGA driving force). (Dummy mass driving force), the vibrations cancel each other, and the vibration force acting on the tip end of the holder arm can be canceled.

Therefore, since the holder arm vibration excited by the HGA driving reaction force of the fine actuator as described with reference to FIGS. 17 and 18 can be suppressed, FIG. 6 that appears during track following (PZT driving).
The two resonance peaks shown in FIG. 6A can be reduced to one as shown in FIG. Next, another specific example of the magnetic head positioning mechanism 100 according to the present invention will be described in detail with reference to FIG.

FIGS. 7 (a) to 7 (d) are a side view and a plan view showing the configuration of the third embodiment according to the present invention. 7, the magnetic head positioning mechanism 100 includes:
Magnetic head support mechanism 5 and fine actuator section 6
And a two-stage actuator composed of a course actuator section 7.

The fine actuator section 6 comprises an actuator spring 8 and a small VCM 20.
In the figure, at a holder arm swaging position 10, it is fitted and connected to a predetermined rotation shaft provided on a holder arm 11 constituting the course actuator section 7 so as to be swingable. Also, an arm block 1 composed of a plurality of holder arms 11
Reference numeral 3 has a movable coil 12 at one end, and forms a VCM in combination with an externally fixed magnetic circuit (not shown) to form a course actuator section 7.

On the other hand, the magnetic head support mechanism 5 in each of the above-described magnetic head positioning mechanism units includes a floating or contact type slider 2 on which the magnetic head 1 is mounted, a gimbal spring 3 and a slider 2 for supporting the slider. The slider 2 is connected to the phi actuator section 6 at a suspension crimping position 9 with the slider 2 facing the recording medium (not shown).

The actuator spring 8 of the fine actuator section 6 is provided with a small VCM 20 at the end opposite to the magnetic head support mechanism 5, and further, between the suspension swaging position 9 and the small VCM 20. Has a spring portion 27, generates an electromagnetic force by applying an arbitrary current to the small VCM, and flexes the spring portion to minutely drive the magnetic head support mechanism in the seek direction. .

At this time, as shown in FIG. 7A, any of the middle holder arms 11 of the arm block 13
Another fine actuator section is similarly connected so as to face up and down with the holder arm interposed therebetween (FIG. 7A: middle arm assay 25). That is, in this specific example, the middle arm assay 2
On one side of the holder arm 11 in each of the magnetic head positioning mechanism units constituting the magnetic head 5, a slider mounted with the magnetic head used for reading and writing predetermined information on a predetermined recording medium is supported. To the magnetic head supporting mechanism holding portions H2 and H4 connected to the magnetic head supporting mechanism configured to perform
On the other side of the holder arm 11, as an example of the vibration suppressing unit 32,
The magnetic head supporting mechanism holding section H connected to a magnetic head supporting mechanism configured to support a slider on which the magnetic head is used for reading and writing predetermined information.
2, a member having the same configuration and the same mass as H4 is provided as a swing compensating member 33 so as to be adjacently opposed to each other and to be swingable.

As described above, when an arbitrary magnetic head supporting mechanism holding unit 30, for example, H2 is minutely driven in the seek direction, another magnetic head supporting mechanism holding unit connected to the opposite side with the holder arm 11 interposed therebetween. 30, a small voice coil motor VCM2 attached to the actuator spring 8 so as to drive H3 in the opposite direction to the magnetic head supporting mechanism holding portion H2 at the same acceleration.
The current applied to 0 is controlled to be in the opposite direction to the current of the small voice coil motor VCM that drives the magnetic head support mechanism holding unit H2.

As a result, as shown in FIGS. 7B to 7D, when the magnetic head 1 in an arbitrary magnetic head supporting mechanism holding portion H2 performing a track following operation is minutely driven by a fine actuator. And the other is connected adjacently on the opposite side with the holder arm 11 therebetween.
The magnetic head supporting mechanism holding portion H3 always drives the magnetic head 1 in the opposite direction with the same acceleration (HGA driving force).

At this time, the HG of the fine actuator
The HGA driving reaction forces acting at the actuator spring connection position at the distal end of the holder arm driven by A (magnetic head support mechanism) are canceled out by the HGA driving reaction forces on the opposite side with the holder arm interposed therebetween. The vibration force acting on the section can be canceled, and the holder arm vibration caused by the HGA driving reaction force can be suppressed.
The vibration characteristics at the time of CM driving) can be improved.

Further, another specific example of the magnetic head positioning mechanism 100 according to the present invention will be described in detail with reference to FIG. FIGS. 8A and 8D are a side view and a plan view showing the configuration of a fourth specific example of the magnetic head positioning mechanism 100 according to the present invention. 8, the fine actuator 6 holding the magnetic head support mechanism H1 or H6 as shown in the first specific example is shown at both ends of the arm block 13, that is, at the uppermost or lowermost holder arm 11. Connected to the side facing the unrecorded recording medium.
On the other side of the magnetic head supporting mechanism H1 or H6, another magnetic head supporting mechanism holding section H on which a dummy mass 22 having a mass corresponding to the equivalent mass of the magnetic head supporting mechanism H1 or H6 is mounted.
0 or H7 (the uppermost arm assay 23 or the lowermost arm assay 24 in FIG. 8A).
reference).

The magnetic head supporting mechanism H1 or H6 connected to the uppermost or lowermost holder arm 11
Is slightly driven in the seek direction, the dummy mass 22 connected to the opposite side with the holder arm 11 interposed therebetween.
Magnetic head supporting mechanism holding unit H0 or H7
The other second drive attached to the dummy actuator 21 provided in the magnetic head support mechanism holding unit H0 or H7 so as to drive the magnetic head support mechanism holding unit H1 or H6 in the opposite direction with the same acceleration. Means 1
6 ', the second small voice coil motor VCM2
The current applied to 0 ′ is in the opposite direction to the current applied to the small voice coil motor VCM 20 supposed to the second drive means 20 constituting the fine actuator section of the magnetic head support mechanism holding section H1 or H6. To control.

Accordingly, when the magnetic head at the uppermost or lowermost position of the arm block is finely driven by the fine actuator 6 to perform the track following operation, the dummy actuator 21 connected to the opposite side with the holder arm 11 interposed therebetween is also constantly operated. Same acceleration (driving force) in opposite direction
The dummy mass is driven, and as shown in FIG. 8 (b) and FIG. 8 (c), the mutual driving reaction force is cancelled, and the exciting force acting on the tip end of the holder arm can be canceled. .

Therefore, since the holder arm vibration caused by the HGA driving reaction force can be suppressed, it is possible to provide a magnetic head positioning mechanism having good vibration characteristics without a resonance peak up to a high frequency band. As is apparent from the specific examples described above, a preferred specific example of the magnetic head positioning mechanism 100 according to the present invention is the multi-layered magnetic head positioning mechanism according to the present invention. A dummy member is arranged on one surface of a holder arm which constitutes the course actuator portion located at both ends of the course actuator portion, and on the other surface, information is actually written on a recording medium or information is recorded from the recording medium. The magnetic head support mechanism having a magnetic head that performs the operation of reading the magnetic head support mechanism or a magnetic head positioning mechanism in which a magnetic head support mechanism holding unit that holds the magnetic head support mechanism is disposed, and as another preferred specific example, In the multilayered magnetic head positioning mechanism, the multilayered individual course actuators The magnetic head supporting mechanism having a magnetic head that actually performs an operation of writing information to a recording medium or reading information from a recording medium is provided on both side surfaces of a holder arm disposed at a portion except for both end portions in the above. This is a magnetic head positioning mechanism in which a magnetic head support mechanism holding section for holding the magnetic head support mechanism is arranged.

On the other hand, as is apparent from the description of the operation method of the magnetic head positioning mechanism 100 in each of the above-described specific examples, the driving method of the magnetic head positioning mechanism according to the present invention employs a slider on which a magnetic head is mounted. A fine actuator section having a magnetic head support mechanism configured to support and a magnetic head support mechanism holding section for holding the magnetic head support mechanism, and being joined to the fine actuator section and around a predetermined rotation axis. A magnetic actuator positioning mechanism comprising a swing actuator that has a holder arm pivotally supported, wherein the coarse actuator swings the holder arm in a seek direction around the rotation axis. For driving the fine actuator. The part, a second order to a small amount swing independently the magnetic head in the seek direction and the swinging motion of the in the holder arm to the coarse actuator portion
In the magnetic head positioning mechanism provided with the driving means, the fine actuator section is provided with vibration suppressing means, and the fine actuator section is provided with the swinging motion of the magnetic head supporting mechanism. It is configured to suppress vibration generated in the holder arm of the actuator section.

In the driving method of the magnetic head positioning mechanism according to the present invention described above, the coarse actuator of the coarse actuator is moved by the swinging movement of the magnetic head supporting mechanism via the vibration suppressing means. It is desirable that the control is performed such that a plurality of resonance frequencies generated in the holder arm are limited to one and the resonance frequency is controlled to move to a higher frequency band side.

In the method of driving the magnetic head positioning mechanism according to the present invention, it is desirable to use a voice coil motor as the first driving means 12 provided in the course actuator section 7. Further, it is desirable to use either a voice coil motor or a piezoelectric element as the second driving means 16 provided in the fine actuator section 6.

Further, in the driving method of the magnetic head positioning mechanism according to the present invention, in the fine actuator section 6, the magnetic head supporting mechanism 5 is formed at least on the magnetic head supporting mechanism holding section 30. The narrow-width spring member 27 is connected to the magnetic head support mechanism holding portion 30 via a narrow-width spring member 27 provided on the actuator spring portion 8.
Deformed by controlling the voltage applied to 0,
The magnetic head 1 is controlled to swing in the seek direction.

In the method of driving the magnetic head positioning mechanism according to the present invention, in the fine actuator section 6, the magnetic head supporting mechanism holding section 30 having the magnetic head supporting mechanism 5 is provided with a course. The voice coil motor 20 is rotatably held by a part of the holder arm 11 of the actuator unit 7 and is attached to the end of the magnetic head support mechanism holding unit 30 by the course actuator unit 7.
The magnetic head 1 is provided so as to face the magnet means 35 provided on the holder arm 11 and controls the current applied to the voice coil motor 20 so as to swing the magnetic head 1 in the seek direction. .

More specifically, in the method of driving the magnetic head positioning mechanism according to the present invention, the vibration suppressing means 32 causes the course actuator section 7 to move due to the swing of the magnetic head supporting mechanism 5. The course actuator section 7 generates a force that offsets the reaction force generated in the holder arm 11
In particular, the vibration suppressing means 32 provided in the fine actuator unit 6 is provided so as to face the magnetic head supporting mechanism holding unit 30 in the fine actuator unit 6, and the magnetic head supporting mechanism 5 or the The vibration compensating member 33 having a mass equivalent to that of the magnetic head supporting mechanism holding portion 30 is provided.
3 allows the swing operation of the magnetic head support mechanism 5 to be independently performed in synchronization with the swing operation of the magnetic head support mechanism 5 in a direction opposite to the swing operation of the magnetic head support mechanism 5.

In such a structure, the swing compensation member 33
And a magnetic head support mechanism 5 configured to support a slider on which the magnetic head is actually used for reading and writing information, or a slider on which the magnetic head is actually used for reading and writing information. It is preferable that the magnetic head supporting mechanism holding section 30 that holds the magnetic head supporting mechanism configured to support the magnetic head supporting mechanism and the magnetic head supporting mechanism holding section 30 be individually provided on mutually opposing flat surfaces of the holder arm 11 that forms the course actuator section 7.

Further, a magnetic head supporting mechanism 5 connected to the upper and lower surfaces of the holder arm 11 and having the magnetic head 1 used for reading and writing information actually mounted thereon is supported. Alternatively, the magnetic head support mechanism holding unit 5 including a magnetic head support mechanism configured to support a slider on which the magnetic head is actually used for reading and writing of information and the swing compensating member, The head support mechanism 5 or the magnetic head support mechanism holding section 30 is connected to the fine actuator section 6
When the second driving means 16 provided in the above is driven to displace the magnetic head by a small amount in the seek direction, the swing compensation member 33 connected to the opposite side with the holder arm 11 interposed therebetween is By driving another second driving means 16 ′ having the same configuration as the second driving means 16, the driving direction of the magnetic head supporting mechanism 5 or the driving direction of the magnetic head supporting mechanism holding section 30 is opposite to the driving direction. It is desirable to always drive the motor with the same force.

In the present invention, the swing compensating member 33
Is composed of a magnetic head supporting mechanism 5 configured to support a slider on which the magnetic head 1 actually used for reading and writing information is used, or the magnetic head supporting mechanism 5 actually used for reading and writing information. A magnetic head supporting mechanism holding section 30 connected to a magnetic head supporting mechanism configured to support a slider on which a magnetic head is mounted is mounted. The swing compensating member 33 also executes actual reading and writing of information. It is also desirable to be able to do so.

On the other hand, in the magnetic head positioning mechanism 100 according to the present invention, among the plurality of course actuators 7 stacked in a multilayer shape, the course actuators arranged at both ends are used. It is desirable that the swing compensation member 33 of the vibration suppressing means 32 be constituted by the dummy member 22 having a mass equivalent to that of the magnetic head support mechanism 5 or the magnetic head support mechanism holding section 30.

Further, in the magnetic head positioning mechanism 100 according to the present invention, in the fine actuator section, the magnetic head supporting mechanism holding section includes a thin plate-shaped actuator spring supporting the magnetic head supporting mechanism and the actuator. The piezoelectric element has two piezoelectric elements as second driving means for driving the spring, and the minute displacement of the magnetic head supporting mechanism in the seek direction of the magnetic head causes a voltage to be alternately applied to the two piezoelectric elements; , A driving force is generated in the two piezoelectric elements, and the actuator spring portion is elastically bent by the driving force. It is.

Further, in the magnetic head positioning mechanism 100 according to the present invention, the oscillation compensating member constituting the vibration suppressing means in the fine actuator section has a mass equivalent to that of the magnetic head supporting mechanism holding section. And a thin plate-shaped actuator spring for supporting a dummy member having a mass equivalent to that of the magnetic head support mechanism, and two other driving means for driving the actuator spring. A small amount of displacement of the dummy member in the seek direction causes a driving force to be generated in the two piezoelectric elements by alternately applying a voltage to the two piezoelectric elements. Magnetic head positioning configured to be performed by elastically deflecting the actuator spring section by means of Mechanism is a driving method.

On the other hand, the magnetic head positioning mechanism 100 according to the present invention supports a slider on which the magnetic head actually used for reading and writing information is mounted, with the holder arm in the fine actuator portion interposed therebetween. A first magnetic head support mechanism holding portion connected to the magnetic head support mechanism configured as described above, and having a mass equivalent to the first magnetic head support mechanism holding portion, which functions as the vibration suppressing means, and A second magnetic head support mechanism holding section connected to a magnetic head support mechanism configured to support a slider on which the magnetic head is actually used for reading and writing information; In any of the second magnetic head supporting mechanism holding sections, the magnetic head supporting mechanism is formed at least in the magnetic head supporting mechanism holding section. The magnetic head supporting mechanism holder is joined to the magnetic head supporting mechanism holder via a narrow spring member provided in the actuator spring section, and the respective narrow spring members in the first and second magnetic head supporting mechanism holders are connected to each other. Deforming by controlling the voltage applied to the piezoelectric elements constituting the second driving means and the other second driving means,
The magnetic head is configured to swing by a minute amount in the seek direction, and a voltage is applied to the piezoelectric element forming one of the second driving means to form the first magnetic head support mechanism holding portion. When the magnetic head supporting mechanism is driven to displace the magnetic head by a small amount in the seek direction, the magnetic head supporting mechanism is provided in a second magnetic head supporting mechanism holding unit connected to the opposite side across the holder arm. A voltage having an opposite phase to the voltage applied to the piezoelectric element of the second drive means is applied to the piezoelectric element constituting the second drive means, and the first magnetic head support mechanism holding unit is applied. The swing direction of the magnetic head support mechanism in the above is a driving method of the magnetic head positioning mechanism that controls to generate the same driving force in the opposite direction.

The magnetic head positioning mechanism 100 according to the present invention supports a slider on which the magnetic head is actually used for reading and writing information, with the holder arm in the fine actuator section interposed therebetween. A first magnetic head supporting mechanism holding portion connected to a magnetic head supporting mechanism configured to perform the above operation, and a first magnetic head supporting mechanism holding portion including a magnetic head supporting mechanism, which functions as the vibration suppressing means, is equivalent to the first magnetic head supporting mechanism holding portion. The first magnetic head supporting mechanism holding portion and the magnetic head supporting mechanism holding portion of the dummy member are provided with a dummy member having a mass of The dummy mass having a mass equivalent to that of the support mechanism is provided at least by the actuator spur formed on the magnetic head support mechanism holding portion. Allowed joined to the magnetic head supporting mechanism retaining unit via a slender spring member provided in the ring portion,
Each of the narrow-width spring members in the first magnetic head support mechanism holding portion and the dummy member is connected to a piezoelectric element constituting a second driving unit and another second driving unit. By controlling the magnetic head, the magnetic head is made to oscillate by a minute amount in the seek direction, and a voltage is applied to the piezoelectric element constituting one of the second driving means to apply the voltage to the first magnetic element. When the magnetic head support mechanism constituting the head support mechanism holding unit is driven and the magnetic head is displaced by a small amount in the seek direction, the magnetic head support mechanism is provided on the dummy member connected to the opposite side across the holder arm. A voltage having a phase opposite to that of the voltage applied to the piezoelectric element of the second driving means is applied to the piezoelectric element constituting another second driving means, and the first magnetic head support mechanism holding mechanism is held. In the department The swing direction of the magnetic head support mechanism, a configured driving method of a magnetic head positioning mechanism so as to control so as to generate the same driving force in the opposite direction.

Further, as another specific example of the magnetic head positioning mechanism 100 according to the present invention, the magnetic head positioning mechanism 100 used for reading and writing information on one surface thereof with the holder arm in the fine actuator portion interposed therebetween. A first magnetic head support mechanism holding unit having a magnetic head support mechanism configured to support a slider on which a magnetic head is mounted, and is rotatably held by a part of a holder arm of the course actuator unit. At the same time, a first magnetic head support mechanism holding section having a first voice coil motor constituting a second driving means is provided at an end of the first magnetic head support mechanism holding section, and the other surface is provided with the first magnetic head support mechanism holding section. The magnetic member having a mass equivalent to that of the first magnetic head support mechanism holding portion, which functions as vibration suppression means, and is actually used for reading and writing information. The connected and configured magnetic head supporting mechanism to support the mounted slider to head 2
A magnetic head supporting mechanism holding portion, wherein the second magnetic head supporting mechanism holding portion is rotatably held by a part of a holder arm of the course actuator portion, and another second driving means is provided at an end of the second magnetic head supporting mechanism holding portion. A second magnetic head supporting mechanism holding portion having a second voice coil motor constituting
Further, in each of the first and second magnetic head supporting mechanism holding portions, the minute displacement of the magnetic head supporting mechanism in the seek direction of the magnetic head causes an arbitrary current to flow through the coil of the voice coil motor. Is applied to generate an electromagnetic force in the voice coil motor, and the electromagnetic force causes the respective magnetic head supporting mechanism holding portions to swing, thereby constituting one second driving unit. When a predetermined current is applied to the voice coil motor to drive the first magnetic head support mechanism holding unit and displace the magnetic head by a small amount in the seek direction, the magnetic head is connected to the opposite side across the holder arm. The voice coil motor that constitutes the other second driving means provided in the second magnetic head support mechanism holding part has the current applied to the second driving means. A magnetic head positioning mechanism for applying a current in a direction to control the magnetic head supporting mechanism in the first magnetic head supporting mechanism holding unit to generate the same driving force in a direction opposite to a swing direction of the magnetic head supporting mechanism. Is the driving method.

Further, as another specific example of the magnetic head positioning mechanism 100 according to the present invention, the magnetic head positioning mechanism 100 is used for reading and writing information on one surface with the holder arm in the fine actuator section interposed therebetween. A first magnetic head support mechanism holding unit having a magnetic head support mechanism configured to support a slider on which a magnetic head is mounted, and is rotatably held by a part of a holder arm of the course actuator unit. At the same time, a first magnetic head support mechanism holding section having a first voice coil motor constituting a second driving means is provided at an end of the first magnetic head support mechanism holding section, and the other surface is provided with the first magnetic head support mechanism holding section. A dummy member that functions as vibration suppression means and has a mass equivalent to that of the first magnetic head support mechanism holding portion including the magnetic head support mechanism. A dummy member having a second voice coil motor that is rotatably held by a part of the holder arm of the course actuator unit and that constitutes second driving means other than the end of the dummy member; In both the first magnetic head support mechanism holding portion and the dummy member, the minute displacement of the magnetic head support mechanism in the seek direction of the magnetic head causes an arbitrary current to flow through the coil of the voice coil motor. Is applied to generate an electromagnetic force in the voice coil motor, and the electromagnetic force causes the respective magnetic head supporting mechanism holding portions to swing, thereby constituting one second driving unit. A predetermined current is applied to the first voice coil motor to drive the first magnetic head support mechanism holding unit, and the magnetic head is displaced by a small amount in the seek direction. In this case, the voice coil motor constituting the other second driving means provided on the dummy member connected to the opposite side of the holder arm is applied to the second driving means. A current in a direction opposite to the current is applied, and control is performed such that the same driving force is generated in a direction opposite to the swing direction of the magnetic head support mechanism in the first magnetic head support mechanism holding unit. This is a method for driving the magnetic head positioning mechanism.

Further, in the magnetic head positioning mechanism 100 according to the present invention, the coarse actuator supports a plurality of the fine actuators, and the coarse actuator supports the seek direction of the fine actuator by the coarse actuator. It is preferable that the displacement to be performed so that a plurality of the fine actuator units are collectively performed.

[0081]

The magnetic head positioning mechanism and the method of driving the same according to the present invention employ the above-described technical configuration, so that when the fine actuator is driven during track following, the holder arm and the holder arm can be moved. HGA driving reaction force acting on the connecting portion of the above is offset by the HGA driving reaction force of another fine actuator or dummy actuator mounted on the opposite side across the holder arm, and acts on the tip end of the holder arm. Since the excitation force can be canceled, resonance due to holder arm vibration can be suppressed, and good vibration characteristics with no resonance peak up to a high frequency band can be obtained. An accurate track following operation (following) can be performed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a first specific example of a magnetic head positioning mechanism according to the present invention, FIG. 1 (a) is a side view, and FIGS. 1 (b) to 1 (d). Is a plan view.

FIGS. 2A to 2C are perspective views showing the configuration of a first specific example of a magnetic head positioning mechanism according to the present invention.

FIGS. 3A and 3B are characteristic diagrams showing frequency characteristics of a two-stage actuator in a first specific example of the magnetic head positioning mechanism according to the present invention.

FIG. 4 is a view showing a configuration of a second specific example of the magnetic head positioning mechanism according to the present invention, where FIG. 4 (a) is a side view, and FIGS. 4 (b) to 4 (d). Is a plan view.

5 (a) to 5 (c) are perspective views showing the configuration of a second specific example of the magnetic head positioning mechanism according to the present invention.

FIGS. 6A and 6B are characteristic diagrams illustrating frequency characteristics of a two-stage actuator in a second specific example of the magnetic head positioning mechanism according to the present invention.

FIG. 7 is a view showing a configuration of a third specific example of the magnetic head positioning mechanism according to the present invention, where FIG. 7 (a) is a side view, and FIGS. 7 (b) to 7 (d). Is a plan view.

FIG. 8 is a diagram showing a configuration of a fourth specific example of the magnetic head positioning mechanism according to the present invention, FIG. 8 (a) is a side view, and FIGS. 8 (b) to 8 (d). Is a plan view.

FIG. 9 is a plan view showing a configuration example of a conventional magnetic head positioning mechanism.

FIG. 10 is a side view and a perspective view showing a configuration example of a conventional magnetic head positioning mechanism.

FIG. 11 is a perspective view showing a conventional example (a head element driving system and a slider driving system) relating to a two-stage actuator.

FIG. 12 is a plan view showing a conventional example (force-acceleration type HGA drive system) of a two-stage actuator.

FIG. 13 shows a conventional example of a two-stage actuator (force-acceleration type HGA drive system).
FIG. 13 (a) is a side view thereof, and FIG. 13 (b) is an enlarged side view of FIG. 13 (a).

FIG. 14 is a diagram showing a conventional example of a two-stage actuator (force-displacement type HGA driving method);
4 (a) is a plan view, FIG. 14 (b) is a side view and FIG.
(C) is an enlarged side view thereof.

FIG. 15 is an explanatory diagram showing an operation of a conventional example of a two-stage actuator (force-displacement type HGA driving method).

FIG. 16 is an explanatory diagram showing an operation of a conventional example of a two-stage actuator (force-displacement type HGA driving method).

FIG. 17A is an arm assay model diagram showing a configuration of a conventional example of a two-stage actuator (force-displacement type HGA driving method), and FIG. 17B is a conventional example of a two-stage actuator. FIG. 17C is a diagram showing vibration characteristics in FIG. 17C, and FIG. 17C shows a mode shape.

18A and 18B are diagrams showing a vibration characteristic and a configuration of a conventional example of a two-stage actuator (force-displacement type HGA driving system), where FIG. 18A is an arm assay model, and FIG. ) Is a characteristic diagram thereof, and FIG.
(C) is a mode shape.

FIG. 19 is a plan view showing vibration factors at the time of arm assembling of a conventional example (force-displacement type HGA drive system) of a two-stage actuator.

FIG. 20 is a perspective view showing a vibration factor at the time of an arm assay of a conventional example (force-displacement type HGA drive system) of a two-stage actuator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Magnetic head, 2 ... Slider, 3 ... Gimbal spring, 4 ... Load beam, 5 ... Magnetic head support mechanism (suspension), 6 ... Fine actuator part, 7 ... Course actuator part, 8 ... ... actuator spring, 9 ... suspension caulking position,
Reference numeral 10: Holder arm swaging position, 11: Holder arm, 12: First driving means, movable coil, 13: Arm block, 14: Rotating bearing part, 15: External fixed magnetic circuit, 16: Second driving means, 16 '... Other second driving means, 160, 160' ... Piezoelectric element, 1
7, 35: permanent magnet, 18: yoke, 19: small coil, 20, 20 ': small voice coil motor (V
CM), 21 ... dummy actuator, 22 ... dummy mass, 23 ... top-most arm assay, 24 ...
Lowermost arm assay, 25 Middle arm assay, 26 Recording medium, 27 Spring section, 30 Magnetic head support mechanism holding section, 31 Rotation axis, 32 Vibration suppression means, 33: swing compensation member, 100: magnetic head positioning mechanism.

Claims (42)

[Claims] A fine actuator section having a magnetic head supporting mechanism configured to support a slider on which a magnetic head is mounted, a magnetic head supporting mechanism holding section for holding the magnetic head supporting mechanism, and the fine actuator section. And a course actuator unit having a holder arm pivotally supported so as to be able to swing around a predetermined rotation axis, wherein the course actuator unit includes the holder arm. The fine actuator unit has a first driving unit for swinging in the seek direction about the rotation axis. On the other hand, the fine actuator unit has a swinging motion of the holder arm in the course actuator unit. Second drive means for independently swinging the magnetic head in the seek direction by a small amount is provided. Further, the fine actuator unit suppresses vibration generated in the holder arm of the course actuator unit in association with the swinging movement of the magnetic head support mechanism in the fine actuator unit. A magnetic head positioning mechanism provided with vibration suppression means. 2. The vibration suppression means limits a plurality of resonance frequencies generated in the holder arm of the course actuator unit to one with the swinging movement of the magnetic head support mechanism, and 2. The magnetic head positioning mechanism according to claim 1, wherein the magnetic head positioning mechanism has a function of moving the resonance frequency to a higher frequency band side. 3. The magnetic head positioning mechanism according to claim 1, wherein the first driving means provided in the course actuator unit is a voice coil motor. 4. The apparatus according to claim 1, wherein said second driving means provided in said fine actuator section is constituted by either a voice coil motor or a piezoelectric element. The magnetic head positioning mechanism according to the above. 5. In the fine actuator section,
The magnetic head support mechanism is joined to the magnetic head support mechanism holding portion via a narrow spring member provided at least between the actuator spring portion formed on the magnetic head support mechanism holding portion, 5. The magnetic head positioning mechanism according to claim 4, wherein said narrow width spring member is deformed by a piezoelectric element. 6. In the fine actuator section,
The magnetic head supporting mechanism holding section having the magnetic head supporting mechanism is rotatably held by a part of the holder arm of the course actuator section, and a voice coil motor is provided at an end of the magnetic head supporting mechanism holding section. The magnetic head positioning mechanism according to claim 4, wherein: 7. The vibration suppressing means has a function of generating a force that cancels a reaction force generated in the holder arm of the course actuator portion due to the swing by the magnetic head support mechanism. 7. The magnetic head positioning mechanism according to claim 1, wherein: 8. The vibration suppressing means according to claim 1, wherein said fine actuator section includes a magnetic actuator supporting mechanism provided on said magnetic head supporting mechanism holding section of said fine actuator section. 2. A swing compensating member for independently performing a swing operation in a direction opposite to the swing operation of the magnetic head support mechanism is added.
8. A magnetic head positioning mechanism according to any one of claims 1 to 7. 9. The magnetic head positioning mechanism according to claim 8, wherein said swing compensating member has a mass equivalent to that of said magnetic head supporting mechanism. 10. The magnetic device according to claim 8, wherein the swing compensating member is constituted by a swingable magnetic head supporting mechanism configured to support a slider on which a magnetic head is mounted. Head positioning mechanism. 11. The magnetic head according to claim 8, wherein said swing compensating member comprises a magnetic head supporting mechanism holding portion including a magnetic head supporting mechanism for supporting a slider on which the magnetic head is mounted. Positioning mechanism. 12. The swing compensating member is a magnetic head supporting mechanism configured to support a slider on which the magnetic head is actually used for reading and writing information, or is used for actually reading and writing information. 10. The magnetic head supporting mechanism according to claim 9, wherein said magnetic head supporting mechanism is configured to support a slider on which said magnetic head is mounted. 12. A magnetic head positioning mechanism according to any one of claims 11 to 11. 13. The swing compensating member is constituted by a magnetic head supporting mechanism configured to support a slider on which the magnetic head is actually used for reading and writing information, or 13. A magnetic head supporting mechanism holding section connected to a magnetic head supporting mechanism configured to support a slider on which the magnetic head is used for reading and writing information. A magnetic head positioning mechanism according to any one of the above. 14. The magnetic head positioning mechanism according to claim 8, wherein said swing compensating member is constituted by a dummy member. 15. The swing compensating member and the magnetic head support mechanism or the magnetic head support mechanism holding unit having a magnetic head that actually performs an operation of writing information to a recording medium or reading information from the recording medium. 15. The magnetic head positioning mechanism according to claim 8, wherein the magnetic head is configured to swing in opposite directions with the same force. 16. The swing compensating member is the magnetic head supporting mechanism or the magnetic head supporting mechanism holding section having a magnetic head that actually performs an operation of writing information on a recording medium or reading information from the recording medium. 16. The magnetic head positioning mechanism according to claim 15, wherein: 17. A magnetic head supporting mechanism configured to support the swing compensating member and a slider on which the magnetic head used for actually reading and writing information is mounted, or A magnetic head supporting mechanism holding portion configured to support a slider on which the magnetic head used for reading and writing of information is mounted is provided on each of opposing flat surfaces of the holder arm constituting the course actuator portion. 17. The magnetic head positioning mechanism according to claim 8, wherein: 18. The method according to claim 1, wherein a plurality of said coarse actuator portions for holding said fine actuator portion are laminated in a multilayer shape.
7. The magnetic head positioning mechanism according to any one of 7. 19. The plurality of course actuator sections are concentrically multilayered in an arm block provided on a holder arm of each of the course actuator sections for receiving the rotation shaft. 19. The magnetic head positioning mechanism according to claim 18, wherein: 20. In the multilayered magnetic head positioning mechanism, one surface of a holder arm constituting each of the coarse actuators located at both ends of each of the multilayer coarse actuators is provided. A dummy member is disposed, and on the other surface, a magnetic head supporting mechanism having a magnetic head for actually performing an operation of writing information to a recording medium or reading information from the recording medium, or a magnetic holding the magnetic head supporting mechanism. 2. A head support mechanism holding portion is arranged.
9. The magnetic head positioning mechanism according to any one of items 9. 21. In the multi-layered magnetic head positioning mechanism, both side surfaces of a holder arm arranged at a portion excluding both ends of the multi-layered individual course actuator portions are respectively provided. It is assumed that the magnetic head support mechanism having the magnetic head for actually performing the operation of writing information to the recording medium or reading the information from the recording medium or the magnetic head support mechanism holding section for holding the magnetic head support mechanism is disposed. 20. The magnetic head positioning mechanism according to claim 1, wherein: 22. A fine actuator section having a magnetic head support mechanism configured to support a slider on which a magnetic head is mounted, a magnetic head support mechanism holding section for holding the magnetic head support mechanism, and the fine actuator section. And a course actuator unit having a holder arm pivotally supported so as to be able to swing around a predetermined rotation axis, wherein the course actuator unit includes the holder arm. The fine actuator unit has a first driving unit for swinging in the seek direction about the rotation axis. On the other hand, the fine actuator unit has a swinging motion of the holder arm in the course actuator unit. Second drive means for independently swinging the magnetic head by a small amount in the seek direction is provided. In the magnetic head positioning mechanism, the fine actuator section is provided with a vibration suppressing means, and the rocking movement of the magnetic actuator supporting mechanism in the fine actuator section causes the vibration of the coarse actuator section. A method for driving a magnetic head positioning mechanism, characterized by suppressing vibrations generated in a holder arm. 23. A plurality of resonance frequencies generated in said holder arm of said course actuator section with said swinging movement of said magnetic head support mechanism through said vibration suppressing means, and 23. The driving method of a magnetic head positioning mechanism according to claim 22, wherein the resonance frequency is controlled to move to a higher frequency band side. 24. The driving method of a magnetic head positioning mechanism according to claim 22, wherein a voice coil motor is used as said first driving means provided in said course actuator section. 25. The magnetic head positioning mechanism according to claim 22, wherein one of a voice coil motor and a piezoelectric element is used as the second driving means provided in the fine actuator section. Drive method. 26. In the fine actuator section, the magnetic head support mechanism is connected to the magnetic head via a narrow spring member provided at least in an actuator spring section formed in the magnetic head support mechanism holding section. 23. The magnetic head, which is joined to a support mechanism holding portion, deforms the narrow width spring member by controlling a voltage applied to the piezoelectric element, and swings the magnetic head in a seek direction. 26. A method of driving a magnetic head positioning mechanism according to any one of claims 25 to 25. 27. In the fine actuator section, the magnetic head supporting mechanism holding section having the magnetic head supporting mechanism is rotatably held by a part of a holder arm of the course actuator section, and the magnetic head supporting section is supported. A voice coil motor is provided at an end of the mechanism holding unit so as to face magnet means provided on the holder arm of the course actuator unit, and the magnetic head is moved in a seek direction by controlling a current applied to the voice coil motor. 26. The method of driving a magnetic head positioning mechanism according to claim 22, wherein the magnetic head is swung. 28. A force which cancels a reaction force generated in a holder arm of the course actuator due to the swing by the magnetic head support mechanism, is generated in the course actuator by the vibration suppressing means. The method for driving a magnetic head positioning mechanism according to any one of claims 22 to 27, wherein: 29. The vibration suppressing means provided in the fine actuator section is provided to face the magnetic head supporting mechanism holding section in the fine actuator section, and the magnetic head supporting mechanism or the magnetic head supporting section is provided. A swing compensating member having a mass equivalent to that of the mechanism holding portion, wherein the swing compensating member is synchronized with the swing operation of the magnetic head supporting mechanism. 29. The driving method of a magnetic head positioning mechanism according to claim 22, wherein the swing operation is performed independently in the opposite direction. 30. A magnetic head supporting mechanism configured to support the swing compensating member and a slider on which the magnetic head used for actually reading and writing information is mounted, or A magnetic head supporting mechanism holding portion configured to support a slider on which the magnetic head used for reading and writing of information is mounted is provided on each of opposing flat surfaces of the holder arm constituting the course actuator portion. 3. The method according to claim 2, wherein
10. The driving method of the magnetic head positioning mechanism according to item 9. 31. A magnetic head supporting mechanism connected to the upper and lower surfaces of the holder arm, the magnetic head supporting mechanism being configured to support the slider on which the magnetic head actually used for reading and writing information is mounted. Or, of the magnetic head supporting mechanism holding portion and the swing compensation member configured to support a slider on which the magnetic head is actually used for reading and writing information, the magnetic head supporting mechanism, or When the magnetic head support mechanism holding unit is driven by the second driving means provided in the fine actuator unit to displace the magnetic head by a small amount in the seek direction, the magnetic head supporting mechanism holding unit is connected to the opposite side across the holder arm. The swing compensating member is driven by another second driving means having the same configuration as the second driving means, and the magnetic head supporting mechanism is driven. Alternatively, a driving method of a magnetic head positioning mechanism is characterized in that the magnetic head supporting mechanism is always driven in the opposite direction to the driving direction of the magnetic head supporting mechanism holding unit with the same force. 32. The swing compensating member is constituted by a magnetic head supporting mechanism configured to support a slider on which the magnetic head is actually used for reading and writing information, or 32. A magnetic head supporting mechanism holding unit connected to a magnetic head supporting mechanism configured to support a slider on which the magnetic head used for reading and writing of information is mounted, according to claim 31, characterized in that: Driving method of the magnetic head positioning mechanism. 33. The magnetic device according to claim 31, wherein the swing compensating member is constituted by the magnetic head supporting mechanism or a dummy member having a mass equivalent to the magnetic head supporting mechanism holding portion. Driving method of the head positioning mechanism. 34. A plurality of coarse actuators for holding the fine actuator, and concentric in an arm block for receiving a predetermined rotation axis provided on a holder arm in each of the coarse actuators. The magnetic head positioning mechanism according to any one of claims 22 to 33, wherein the magnetic head positioning mechanism according to any one of claims 22 to 33, wherein the magnetic head positioning mechanism is configured to be laminated in a multilayer shape so that the plurality of course actuator portions swing integrally. Drive method. 35. The swing compensating member of the vibration suppressing means in the course actuators disposed at both ends of the plurality of course actuators stacked in a multilayer shape, the swing compensating member being the magnetic head. 35. The driving method of a magnetic head positioning mechanism according to claim 34, comprising a dummy member having a mass equivalent to the supporting mechanism or the magnetic head supporting mechanism holding portion. 36. The magnetic head support mechanism holding section of the fine actuator section includes a thin plate-shaped actuator spring for supporting the magnetic head support mechanism and a second drive unit for driving the actuator spring. The piezoelectric element has two piezoelectric elements, and the minute displacement of the magnetic head support mechanism in the seek direction of the magnetic head is driven by the two piezoelectric elements by alternately applying a voltage to the two piezoelectric elements. 36. The driving method of a magnetic head positioning mechanism according to claim 22, wherein the driving is performed by generating a force and elastically bending the actuator spring portion by the driving force. 37. The swing compensating member constituting the vibration suppressing means in the fine actuator section is constituted by a holding member having a mass equivalent to the magnetic head supporting mechanism holding section, A thin plate-shaped actuator spring supporting a dummy member having a mass equivalent to that of the mechanism; and two piezoelectric elements as another second driving means for driving the actuator spring. A small amount of displacement in the direction causes a drive force to be generated in the two piezoelectric elements by alternately applying a voltage to the two piezoelectric elements, and the actuator spring portion is elastically bent by the drive force. The method according to any one of claims 22 to 36, wherein the method is executed by: 38. A magnetic head supporting mechanism configured to support a slider on which the magnetic head is actually used for reading and writing information, with the holder arm in the fine actuator section interposed therebetween. A first magnetic head support mechanism holding portion, and the magnetic head having a mass equivalent to the first magnetic head support mechanism holding portion, which functions as the vibration suppressing means, and which is actually used for reading and writing information. And a second magnetic head support mechanism holding portion connected to a magnetic head support mechanism configured to support a slider having the first and second magnetic head support mechanisms mounted thereon. Further, in the first and second magnetic head support mechanism holding portions, In any case, the magnetic head supporting mechanism is a narrow spring part provided at least in an actuator spring part formed in the magnetic head supporting mechanism holding part. The narrow spring members in the first and second magnetic head supporting mechanism holding parts are respectively joined to the second driving means and the other second driving means. Deformed by controlling the voltage applied to the piezoelectric element constituting the driving means,
The magnetic head is configured to swing by a minute amount in the seek direction, and a voltage is applied to the piezoelectric element forming one of the second driving means to form the first magnetic head support mechanism holding portion. When the magnetic head supporting mechanism is driven to displace the magnetic head by a small amount in the seek direction, the magnetic head supporting mechanism is provided in a second magnetic head supporting mechanism holding unit connected to the opposite side across the holder arm. A voltage having an opposite phase to the voltage applied to the piezoelectric element of the second drive means is applied to the piezoelectric element constituting the second drive means, and the first magnetic head support mechanism holding unit is applied. 23. The apparatus according to claim 22, wherein the driving direction is controlled so as to generate the same driving force in a direction opposite to the swing direction of the magnetic head supporting mechanism.
38. The driving method of the magnetic head positioning mechanism according to any one of claims to 37. 39. A magnetic head supporting mechanism configured to support a slider on which the magnetic head is actually used for reading and writing information, with the holder arm in the fine actuator section interposed therebetween. A first magnetic head support mechanism holding portion, and a dummy member having a mass equivalent to that of the first magnetic head support mechanism holding portion including the magnetic head support mechanism, the dummy member functioning as the vibration suppressing means. In the magnetic head supporting mechanism holding section and the magnetic head supporting mechanism holding section in the dummy member, the magnetic head supporting mechanism and the dummy mass having a mass equivalent to the magnetic head supporting mechanism are at least provided by the magnetic head. The magnetic head is provided via a narrow spring member provided on an actuator spring section formed on the support mechanism holding section. The first magnetic head support mechanism holding portion and each of the narrow spring members of the dummy member constitute a second driving means and another second driving means, respectively. By controlling the voltage applied to the piezoelectric element to be deformed, the magnetic head is configured to swing slightly in the seek direction,
A voltage is applied to the piezoelectric element constituting one of the second driving means to drive the magnetic head supporting mechanism constituting the first magnetic head supporting mechanism holding unit, and the magnetic head is moved in a seek direction by a small amount. When displacing, the piezoelectric element constituting the other second driving means provided on the dummy member connected to the opposite side with the holder arm interposed therebetween includes the piezoelectric element of the second driving means. A voltage having a phase opposite to that of the applied voltage is applied to generate the same driving force in the direction opposite to the swing direction of the magnetic head support mechanism in the first magnetic head support mechanism holding section. 38. The method of driving a magnetic head positioning mechanism according to claim 22, wherein the control is performed in the following manner. 40. A magnetic head supporting mechanism configured to support a slider on which the magnetic head used for actually reading and writing information is supported on one surface with the holder arm in the fine actuator portion interposed therebetween. A first magnetic head support mechanism holding portion having a pivot arm, which is rotatably held by a part of a holder arm of the course actuator portion, and a second magnetic head support mechanism holding portion provided at an end of the first magnetic head support mechanism holding portion. A first magnetic head supporting mechanism holding portion having a first voice coil motor constituting a driving means is provided, and the other surface is equivalent to the first magnetic head supporting mechanism holding portion functioning as the vibration suppressing means. Magnetic head support mechanism configured to support a slider having the mass of the magnetic head and having the magnetic head actually used for reading and writing information A second magnetic head support mechanism holding portion connected to the second magnetic head support mechanism holding portion rotatably held by a part of the holder arm of the course actuator portion, and another end portion of the second magnetic head support mechanism holding portion. Having a second voice coil motor constituting a second driving means
In the first and second magnetic head support mechanism holding portions, the minute displacement of the magnetic head support mechanism in the seek direction of the magnetic head in both cases is: By applying an arbitrary current to the coil of the voice coil motor, an electromagnetic force is generated in the voice coil motor, and the respective magnetic head support mechanism holding units are configured to swing by the electromagnetic force,
When a predetermined current is applied to the voice coil motor constituting one of the first driving means to drive the first magnetic head support mechanism holding unit and displace the magnetic head by a small amount in the seek direction, The voice coil motor constituting the other second driving means provided on the second magnetic head support mechanism holding portion connected to the opposite side with the holder arm interposed therebetween is applied to the second driving means. A current in the opposite direction to the applied current is applied to generate the same driving force in the direction opposite to the swing direction of the magnetic head support mechanism in the first magnetic head support mechanism holding section. 38. The method of driving a magnetic head positioning mechanism according to claim 22, wherein the driving is controlled. 41. A magnetic head support mechanism configured to support a slider on which one side of the holder arm in the fine actuator section is mounted, the slider being used for actually reading and writing information. A first magnetic head support mechanism holding portion having a pivot arm, which is rotatably held by a part of a holder arm of the course actuator portion, and a second magnetic head support mechanism holding portion provided at an end of the first magnetic head support mechanism holding portion. A first magnetic head supporting mechanism holding portion having a first voice coil motor constituting a driving means is provided, and a first magnetic field including the magnetic head supporting mechanism functioning as the vibration suppressing means is provided on the other surface. A dummy member having a mass equivalent to that of the head support mechanism holding portion, and is rotatably held by a part of the holder arm of the course actuator portion. And a dummy member having a second voice coil motor constituting another second driving means is provided at an end of the dummy member, and further provided on the first magnetic head support mechanism holding portion and the dummy member. In
In any case, the minute displacement of the magnetic head supporting mechanism in the seek direction of the magnetic head is caused by applying an arbitrary current to the coil of the voice coil motor to generate an electromagnetic force in the voice coil motor, The respective magnetic head supporting mechanism holding portions are configured to swing, and a predetermined current is applied to the first voice coil motor that constitutes one of the second driving means to apply the first current to the first voice coil motor. When the magnetic head support mechanism holding unit is driven to displace the magnetic head by a small amount in the seek direction, the other second driving means provided on the dummy member connected to the opposite side across the holder arm Is applied to the voice coil motor in a direction opposite to the direction of the current applied to the second driving means, so that the first magnetic head support mechanism holding section is connected to the voice coil motor. The swing direction of the magnetic head support mechanism, a driving method of a magnetic head positioning mechanism according to any one of claims 22 to 37, characterized in that the control so as to generate the same driving force in the opposite direction. 42. The coarse actuator section supports a plurality of the fine actuator sections, and displacement of the fine actuator section in the seek direction by the coarse actuator section collectively includes the plurality of fine actuator sections. 42. The driving method of a magnetic head positioning mechanism according to claim 40, wherein the driving method is configured to perform the operation.