JP2004199823A - Magnetic head assembly and magnetic disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a magnetic head assembly and a magnetic disk device in which high speed drive of a slider can be performed and adhesive strength of a slider for a suspension is high, with respect to the magnetic head asembly and the magnetic disk device provided with a slider on which the magnetic head is mounted, the suspension, and a piezoelectric actuator. <P>SOLUTION: A slider 12 is coupled to a suspension 15 through a coupling member 17 at a position on an axis S being vertical to its sliding plane 12a and passing through a centroid of the slider 12. Also, a plurality of piezoelectric elements 21, 22 for producing rotation driving force of a piezoelectric actuator 16 are arranged around the coupling member 17 between the slider 12 and the suspension 15 so that rotation driving force of the same direction is generated cooperatively at the time of shrinking, one end side in the direction of rotation of the slider 12 of each piezoelectric element 21, 22 is adhered to the slider 12, the other end side is adhered to the suspension 15. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a slider on which a magnetic head is mounted, a suspension opposed to the slider, and a piezoelectric actuator connected between the slider and the suspension for driving the slider to rotate around an axis perpendicular to the sliding surface thereof. And a magnetic head assembly comprising the same.
[0002]
The present invention also relates to a magnetic disk drive having a piezoelectric actuator that drives a slider in a magnetic head assembly, and a main actuator that rotationally drives a suspension of the magnetic head assembly to move a magnetic head in a track width direction of a disk.
[0003]
[Prior art]
In recent years, miniaturization and precision of information devices and the like have been advanced, and the demand for actuators that require movement control over a minute distance has been increasing. In particular, an actuator for focus correction and inclination control of an optical system, a magnetic head actuator of an ink jet printer device or a magnetic disk device, and the like, require movement control of a minute distance.
[0004]
In such a situation, with the expansion of the market and the higher performance of the magnetic disk device, increasing the capacity is becoming more and more important. In general, increasing the capacity of a magnetic disk drive can be achieved by increasing the storage capacity per disk. However, in order to further increase the capacity without increasing the outer diameter of the disk, it is essential to increase the number of tracks per unit length (TPI), that is, to reduce the track width. . However, when the track width is reduced, the allowable amount of the positioning error of the magnetic head is reduced in proportion to this.
[0005]
In a general magnetic disk drive, a slider of a magnetic head is supported by a carriage arm via a suspension, and the carriage arm is rotated by an actuator (voice coil motor). In this case, it is difficult to position the magnetic head with high accuracy in a short time. The reason is that increasing the rigidity of the carriage arm and the like to increase the resonance frequency in the in-plane direction has reached the limit.
[0006]
In view of this, a two-stage actuator type magnetic disk device that attempts to position the magnetic head with high accuracy by additionally arranging an actuator for finely adjusting the position of the magnetic head in addition to the actuator for driving the carriage arm is proposed. Have been.
[0007]
As a magnetic head assembly that can be used in a magnetic disk drive of this type, there is a magnetic head assembly that has a piezoelectric actuator between a slider and a suspension, and swings the slider with respect to the suspension using the piezoelectric actuator.
[0008]
As this magnetic head assembly, for example, although it has a configuration for enabling azimuth recording, there is a magnetic head assembly in which a piezoelectric actuator is arranged between a slider and a suspension of the magnetic head assembly (see Patent Document 1).
[0009]
As shown in FIG. 9, the configuration of the piezoelectric actuator includes a piezoelectric element between a pair of first and second fixed portions 1 and 2 which are spaced apart from each other so as to connect the fixed portions 1 and 2 to each other. The first displacement part 3 and the second displacement part 4 are provided side by side, the first fixed part 1 is fixed to the suspension 5, and the second fixed part 2 is fixed to the slider 6. The slider 6 is rotated (oscillated) by expanding and contracting the displacement portion 4 in the opposite direction. A magnetic head 7 is mounted on the slider 6.
[0010]
In order to invert the polarity of the azimuth angle between the adjacent tracks, the magnetic head assembly expands the first displacement portion 3 and simultaneously contracts the second displacement portion 4, thereby causing the slider 6 to move as shown in FIGS. Is rotated in the direction of arrow R by a fixed angle (−α), or conversely, the first displacement portion 3 is contracted and the second displacement portion 4 is extended, so that the slider 6 is moved by a fixed angle (−α) in the direction opposite to the arrow R. + Α) to reverse the polarity of the azimuth angle.
[0011]
[Patent Document 1]
Japanese Patent Application Laid-Open No. H11-273401 (FIGS. 2 to 4)
[0012]
[Problems to be solved by the invention]
A magnetic head assembly used in a two-stage actuator type magnetic disk drive is incorporated in a servo loop, and a slider is driven at a high speed with a minute stroke of, for example, 1 μm or less. In order to enable this high-speed driving, it is necessary to increase the natural frequency of the mechanical vibration system of the magnetic head assembly (the mechanical vibration system in which the slider 6 is supported by the first displacement portion 3 and the second displacement portion 4). (For example, 20 KHz or more).
[0013]
By the way, in the magnetic head assembly described in Patent Literature 1, the same end side (the left end side in FIG. 9 and the lower end side in FIG. 10) of the displacement parts 3 and 4 arranged in parallel are fixed to the slider 6, and the other end side is fixed. It is fixed to the suspension 5, and one of the first displacement part 3 and the second displacement part 4 is contracted and the other is extended. For this reason, the first displacement portion 3 and the second displacement portion 4 are curved concentrically as shown in FIG. 10, and when the slider 6 is viewed from the suspension 5, the center of gravity of the slider 6 becomes 10 will also move to the right.
[0014]
Therefore, this magnetic head assembly has a problem that the inertia at the time of driving the slider is large, and the natural frequency of the mechanical vibration system of the magnetic head assembly cannot be increased.
[0015]
Further, when the magnetic head assembly is mounted on a notebook computer or the like, an external force applied to the notebook computer or the like may cause the magnetic head assembly to receive a shock. Therefore, in the magnetic head assembly, it is required to increase the adhesive strength of the slider to the suspension.
[0016]
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to realize a magnetic head assembly and a magnetic disk drive capable of driving a slider at high speed and having a high adhesive strength of a slider to a suspension.
[0017]
[Means for Solving the Problems]
The invention according to claim 1 relates to a magnetic head assembly. Referring to FIG. 1 showing an embodiment of the present invention, a slider 12 on which a magnetic head 11 is mounted and a tip end portion of the slider 12 are provided. A suspension 15 is provided between the slider 12 and the suspension 15. The piezoelectric actuator 16 is connected between the slider 12 and the suspension 15, and drives the slider 12 to rotate about an axis S perpendicular to the sliding surface 12a of the slider 12.
[0018]
Further, the slider 12 is connected to the suspension 15 via a connecting member 17 at a position on an axis S perpendicular to the sliding surface 12a and passing through the center of gravity of the slider 12. A plurality of piezoelectric elements 21 and 22 for generating a rotational driving force of the piezoelectric actuator 16 are connected between the slider 12 and the suspension 15 so as to cooperate with each other when contracted to generate a rotational driving force in the same direction. One end of each of the piezoelectric elements 21 and 22 in the rotation direction of the slider 12 is adhered to the slider 12, and the other end is adhered to the suspension 15.
[0019]
In the magnetic head assembly according to the first aspect, the slider 12 is supported not only at one end of the plurality of piezoelectric elements 21 and 22 but also at the axis S perpendicular to the sliding surface 12 a of the slider 12 and passing through the center of gravity of the slider 12. Above, it is rotatably supported by the connecting member 17. Therefore, the adhesive strength of the slider 12 to the suspension 15 is high.
[0020]
Further, the slider 12 is driven to rotate by the piezoelectric elements 21 and 22 arranged around the connecting member 17. For this reason, it rotates about the axis S perpendicular to the sliding surface 12a of the slider 12 and passing through the center of gravity of the slider 12, and the center of gravity does not move. Therefore, inertia at the time of driving the slider 12 is small, the natural frequency as a mechanical vibration system of the magnetic head assembly can be increased, and the slider 12 can be driven at high speed.
[0021]
According to a second aspect of the present invention, in the magnetic head assembly according to the first aspect, the piezoelectric element in the piezoelectric actuator is driven to rotate on a plane parallel to the sliding surface of the slider around the axis passing through the center of gravity. By arranging them at equal angular intervals in the direction, it is possible to avoid applying unnecessary shearing force to the connecting member and efficiently convert the expansion and contraction force of the piezoelectric element into the rotational moment of the slider.
[0022]
According to a third aspect of the present invention, in the magnetic head assembly according to the second aspect, as a piezoelectric element in the piezoelectric actuator, a pair of identically shaped piezoelectric elements disposed around an axis passing through the center of gravity is used, and It is characterized in that the slider can be efficiently rotated with a simple configuration.
[0023]
According to a fourth aspect of the present invention, in the magnetic head assembly according to the third aspect, by increasing the interval between the pair of piezoelectric elements around an axis passing through the center of gravity, a coupling area of the coupling member on the slider can be increased. It is characterized by doing so.
[0024]
According to a fifth aspect of the present invention, there is provided a slider on which a magnetic head is mounted, a suspension having a front end portion opposed to the slider, and a slider disposed between the slider and the suspension. A magnetic head assembly having a piezoelectric actuator that is driven to rotate about an axis perpendicular to a plane, a carriage arm having a suspension of the magnetic head assembly attached to a tip end thereof, and the carriage arm being parallel to a sliding surface of the slider. And a main actuator for driving the magnetic head in the track width direction of the disk by rotating the magnetic head in a track width direction, the position being on an axis perpendicular to the slider sliding surface and passing through the center of gravity of the slider. In, the slider is connected to the suspension via the connecting member In addition, between the slider and the suspension, a plurality of piezoelectric elements for generating a rotational driving force of the piezoelectric actuator are arranged around the connecting member so as to cooperate to generate a rotational driving force in the same direction when contracted. And one end of each piezoelectric element in the rotation direction of the slider is bonded to the slider, and the other end is bonded to the suspension.
[0025]
In this configuration, a high-performance magnetic disk drive can be realized because a magnetic head assembly that can drive the slider at high speed and has a high adhesion strength of the slider to the suspension is used.
[0026]
Embodiment
First, a magnetic disk drive in which an embodiment of a magnetic head assembly according to the present invention is incorporated (which is also an embodiment of a magnetic disk drive according to the present invention) will be described with reference to FIG. FIG. 2 shows the internal structure of the disk enclosure with the cover removed. In FIG. 2, a disk 32 driven by a spindle motor (not shown) is disposed in the center of an enclosure 31 that seals the inside of the apparatus, and a carriage arm 33 rotates about a shaft 34 near the outer periphery of the disk 32. It is provided as possible. The leading end of the carriage arm 33 extends in the direction of the disk 32, and the magnetic head assembly 35 is mounted thereon.
[0027]
A main actuator (voice coil motor) 36 for driving the carriage arm 33 to rotate is provided on the base end side of the carriage arm 33. The main actuator 36 has been widely used in the past. Specifically, a magnetic circuit having a magnetic gap is fixed to the enclosure 31 side, and a voice coil (moving coil) is fixed to the carriage arm 33. is there. When a drive current is applied to the voice coil in the main actuator 36, a thrust is generated in the voice coil portion in the magnetic gap, the carriage arm 33 rotates, and the magnetic head in the magnetic head assembly 35 moves in the track width direction of the disk 32. It will move to T.
[0028]
Next, the structure of the magnetic head assembly 35 will be described with reference to FIGS. The magnetic head 11 reads and writes data on the disk 32, and is mounted on the slider 12. The surface of the slider 12 facing the disk 32 is a sliding surface (usually a rail formed on this surface) 12a parallel to the disk surface. When the disk 32 rotates, the sliding surface 12a becomes Ascends from the disk surface.
[0029]
A substantially U-shaped punched hole 10 is formed at the end of the leaf spring-shaped suspension 15, and a slider holding portion 15 a formed therein is arranged to face the slider 12. The piezoelectric actuator 16 drives the slider 12 to rotate about an axis S perpendicular to the sliding surface 12a of the slider 12, and is connected between the slider 12 and the suspension 15 (slider holding portion 15a) by bonding or the like.
[0030]
The piezoelectric actuator 16 according to the present embodiment includes a columnar connecting member 17 and a pair of prismatic piezoelectric elements 21 and 22. At a position on the axis S perpendicular to the sliding surface 12a of the slider 12 and passing through the center of gravity of the slider 12, the lower end of the connecting member 17 is adhered to the adhered portion 12b of the slider 12 by an adhesive layer 17a. The upper end is adhered to the attachment portion 15b of the suspension 15 by the layer 17b.
[0031]
Further, the piezoelectric elements 21 and 22 in the piezoelectric actuator 16 have the same shape, and are arranged around the connecting member 17 so as to cooperate with each other to generate a rotational driving force in the same direction when contracted. . Specifically, they are arranged on the surface parallel to the sliding surface 12a of the slider 12 at equal angular intervals around the axis S passing through the center of gravity of the slider 12 in the same rotational drive direction (axis S). Are arranged symmetrically with respect to each other).
[0032]
One ends 21a and 22a of the piezoelectric elements 21 and 22 in the rotation direction of the slider 12 (symmetrical positions around the axis S) are adhered to the suspensions 15c and 15d by adhesive layers 21b and 22b. The sides 21c and 22c (which are symmetrical with respect to the axis S) are adhered to the adherends 12c and 12d of the slider 12 by adhesive layers 21d and 22d.
[0033]
Each of the piezoelectric elements 21 and 22 contracts in the direction A in FIG. 1 when a voltage is applied between its electrodes, and is, for example, as shown in FIG. This piezoelectric element has a structure in which a plurality of internal electrode layers 42 and 43 are alternately laminated with a piezoelectric layer (for example, a PNN-PT-PZ piezoelectric ceramic) 41 interposed therebetween. Reference numeral 42 is electrically connected to the surface electrode 44, and the plurality of internal electrode layers 43 on the other end side are electrically connected to the surface electrode 45. The internal electrode layer 42 and the internal electrode layer 43 overlap at the intermediate portion 46 in the expansion and contraction direction of the piezoelectric element, but the internal electrode layer 42 and the internal electrode layer 43 do not overlap at the end portions 47 and 48. The internal electrodes 42 and 43 are embedded in a piezoelectric ceramic. The ends 47 and 48 constitute the ends 21a, 21c, 22a and 22c of the piezoelectric elements 21 and 22, respectively.
[0034]
This piezoelectric element expands and contracts based on the piezoelectric longitudinal effect (so-called 31 mode). When a driving voltage is applied between the surface electrodes 44 and 45, the piezoelectric element contracts in the direction of arrow A in FIG. And return to the original length.
[0035]
As a material constituting the internal electrode layers 42 and 43, a material that can be integrally fired together with the piezoelectric material is preferable. For example, a metal material such as Pt, Ag, Ag-Pd, Ni, and Au, or a conductive ceramic may be used. . In particular, a Pt paste containing about 20 vol% of PNN-PT-PZ powder (more than 20 vol% if conductivity is obtained, or less than 20 vol% if adhesion is not so required) is preferable. The surface electrodes 44 and 45 can be easily formed by vapor deposition or sputtering, but may be formed by electroless plating using Ni, Cr, Au, or the like, or may be formed by ion plating, CVD, or the like. Or it may be formed by a thick film technique.
[0036]
The piezoelectric element is manufactured using, for example, a PNN-PT-PZ green sheet. For example, an electrode pattern of the internal electrode layer 42 is screen-printed on the green sheet. Next, after one green sheet is stacked, the electrode pattern of the internal electrode layer 43 is screen-printed this time. In this way, two types of electrode patterns are alternately arranged with the green sheets interposed therebetween to form a piezoelectric block (corresponding to a two-dimensionally aligned piezoelectric element).
[0037]
Thereafter, the piezoelectric block is fired in the atmosphere at, for example, 1050 ° C., and then cut by a cut saw to obtain a divided block having the same width as the above-mentioned piezoelectric element (corresponding to one in which the piezoelectric elements are arranged in a line). Next, electrode films corresponding to the surface electrodes 44 and 45 are formed on both side surfaces of the divided block by vapor deposition or sputtering, and this divided block is cut by a cut saw from directions different from each other by 90 °. The final unit of piezoelectric element shown (separated into one) is obtained.
[0038]
When the piezoelectric elements having such a configuration are used as the piezoelectric elements 21 and 22, it is easy to move the magnetic head 11 by about 1 μm in the T direction in FIG. 2 by applying about 30 V between the surface electrodes 44 and 45. . Therefore, assuming that the piezoelectric elements 21 and 22 have this performance, a driving example of the piezoelectric elements 21 and 22 in the embodiment shown in FIGS. 1 and 2 will be described.
[0039]
First, 15 V is applied between the electrodes of the piezoelectric elements 21 and 22 immediately after the start. As a result, the piezoelectric elements 21 and 22 contract, the slider 12 rotates from the position shown in FIG. 3 to the position shown in FIG. 5, and the magnetic head 11 moves about 0.5 μm. This is the neutral position of the magnetic head 11. At the time of tracking control of the slider 12, the applied voltage is changed in the range of + 15V to -15V from the voltage 15V, and the magnetic head 11 is moved in the range of + 0.5µm to -0.5µm from the neutral position. To follow. When the magnetic head 11 is out of the control range of the piezoelectric actuator 16, the carriage arm 33 is rotated by the main actuator 36 to move the magnetic head 11.
[0040]
As described above, in the present embodiment, the slider 12 is not only supported by one end of the plurality of piezoelectric elements 21 and 22, but also on the axis S which is perpendicular to the sliding surface 12 a of the slider 12 and passes through the center of gravity of the slider 12. Is rotatably supported by the connecting member 17. Therefore, the adhesive strength of the slider 12 to the suspension 15 is high.
[0041]
Further, the slider 12 is driven to rotate by the piezoelectric elements 21 and 22 arranged around the connecting member 17. For this reason, it rotates about the axis S perpendicular to the sliding surface 12a of the slider 12 and passing through the center of gravity of the slider 12, and the center of gravity does not move. Therefore, inertia at the time of driving the slider 12 is small, the natural frequency as a mechanical vibration system of the magnetic head assembly can be increased, and the slider 12 can be driven at high speed.
[0042]
Further, the piezoelectric elements 21 and 22 are oriented on the plane parallel to the sliding surface 12a of the slider 12 in the same rotational drive direction (counterclockwise in FIG. 3) about the axis S passing through the center of gravity of the slider 12. By arranging them at equal angular intervals (180 °), it is possible to avoid applying unnecessary shearing force to the connecting member 17 and efficiently convert the expansion and contraction force of the piezoelectric elements 21 and 22 into the rotational moment of the slider 12.
[0043]
In particular, by using a pair of piezoelectric elements 21 and 22 of the same shape arranged around an axis S passing through the center of gravity of the slider 12 as in the present embodiment, two piezoelectric elements of one type may be prepared, With the simplest configuration, the slider 12 can be rotated efficiently.
[0044]
FIGS. 6 and 7 are views showing another embodiment of the piezoelectric actuator used in the magnetic head assembly and the magnetic disk drive according to the present invention. In these drawings, the same parts as those in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted.
[0045]
The piezoelectric actuator shown in FIG. 6 is obtained by bending the piezoelectric elements 21 and 22 in a crank shape in order to increase the interval between the pair of piezoelectric elements 21 and 22 around the axis S passing through the center of gravity of the slider 12. . Thereby, the bonding area of the slider 12 with the connecting member 17 can be increased, and the bonding strength can be further increased. In the piezoelectric actuator shown in FIG. 7, a pair of piezoelectric elements 21 and 22 are curved around an axis S passing through the center of gravity of the slider 12 for the same purpose.
[0046]
FIG. 8 is a view showing another embodiment of the piezoelectric actuator used in the magnetic head assembly and the magnetic disk drive according to the present invention. In this figure, the same parts as those in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted.
[0047]
In the piezoelectric actuator shown in FIG. 8, in order to increase the bonding area between the ends 21a, 21c, 22a, 22c of the pair of piezoelectric elements 21, 22 and the slider 12 or the suspension 15, these ends are formed in an L-shape. It is bent. This can also increase the adhesive strength.
[0048]
The present invention is not limited to the configuration of the above embodiment. For example, the following modifications are possible.
[0049]
(1) The connecting member 17 is not limited to a cylinder. For example, it may be a prism or the like. As a material of the connecting member 17, ceramic or the like can be used, but the material is not limited to this. Further, the connecting member 17 may be formed integrally with the slider 12.
[0050]
{Circle around (2)} The piezoelectric elements 21 and 22 do not necessarily have to have the same shape. Even if the expansion and contraction forces generated by the piezoelectric elements 21 and 22 are different, the center of gravity of the slider 12 does not move during the rotation of the slider 12 due to the presence of the connecting member 17. However, a shear force having a magnitude corresponding to the difference in the expansion and contraction force is additionally applied to the slider 12.
[0051]
{Circle around (3)} The plurality of piezoelectric elements in the piezoelectric actuator 16 need only be arranged around the connecting member 17 so as to cooperate to generate a rotational driving force in the same direction when contracted. When the number of piezoelectric elements is n, their angular intervals are 360 ° / n).
[0052]
(4) As the piezoelectric element used for the piezoelectric actuator, a piezoelectric element that contracts based on the piezoelectric longitudinal effect has been described, but the present invention is not limited to this.
[0053]
(5) The piezoelectric elements 21 and 22 are bent or curved in a crank shape in order to widen the space between the pair of piezoelectric elements 21 and 22 around the axis S passing through the center of gravity of the slider 12, but other than the above embodiment. (For example, bent in the shape of a “ku”) may be selected. Further, it is also possible to combine the configuration shown in FIGS. 6 and 7 with the configuration shown in FIG.
[0054]
【The invention's effect】
As described above, according to the first aspect of the present invention, the slider is not only supported at one end of the plurality of piezoelectric elements, but also on an axis perpendicular to the sliding surface of the slider and passing through the center of gravity of the slider. Further, since the slider is rotatably supported by the connecting member, a magnetic head assembly having a high adhesion strength of the slider to the suspension can be realized.
[0055]
Further, since the slider is rotationally driven by the piezoelectric element arranged around the connecting member, the slider rotates about an axis perpendicular to the sliding surface of the slider and passing through the center of gravity of the slider. Absent. Therefore, the inertia when driving the slider is small, the natural frequency of the magnetic head assembly as a mechanical vibration system can be increased, and a magnetic head assembly capable of driving the slider at high speed can be realized.
[0056]
According to the invention according to claim 2, the piezoelectric elements in the piezoelectric actuator are arranged at equal angular intervals on the surface parallel to the sliding surface of the slider in the same rotational drive direction about the axis passing through the center of gravity. With the arrangement, it is possible to avoid applying an unnecessary shear force to the connecting member, and to realize a magnetic head assembly capable of efficiently converting the expansion / contraction force of the piezoelectric element into the rotational moment of the slider.
[0057]
According to the invention according to claim 3, as the piezoelectric element in the piezoelectric actuator, a pair of same-shaped piezoelectric elements arranged around an axis passing through the center of gravity is used, so that the piezoelectric element has the simplest configuration and is efficiently used. A magnetic head assembly capable of rotating the slider can be realized.
[0058]
According to the fourth aspect of the present invention, since the space between the pair of piezoelectric elements is widened around the axis passing through the center of gravity, the coupling area of the connecting member on the slider can be increased, and the magnetic head assembly has high adhesive strength. Can be realized.
[0059]
According to the fifth aspect of the present invention, it is possible to realize a magnetic disk device having a high adhesive strength of the slider to the suspension and capable of driving the slider at a high speed.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing one embodiment of a magnetic head assembly according to the present invention.
FIG. 2 is a diagram showing a magnetic disk drive in which an embodiment of the piezoelectric actuator according to the present invention is incorporated.
FIG. 3 is a view of the embodiment shown in FIG. 1 as viewed from a lower surface side.
FIG. 4 is a perspective view showing an example of a piezoelectric element.
FIG. 5 is a diagram for explaining the operation of the embodiment shown in FIG. 1;
FIG. 6 is a diagram showing another example of a piezoelectric actuator in a magnetic head assembly.
FIG. 7 is a diagram showing another example of the piezoelectric actuator in the magnetic head assembly.
FIG. 8 is a diagram illustrating another example of the piezoelectric actuator in the magnetic head assembly.
FIG. 9 is an exploded perspective view showing a conventional magnetic head assembly.
FIG. 10 is a diagram showing an operation in a conventional configuration.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Magnetic head 12 Slider 12a Sliding surface 15 Suspension 16 Piezoelectric actuator 17 Connecting member 21, 22 Piezoelectric element 21a, 22a One end 21b, 22b Adhesive layer 21c, 22c Other end 21d, 22d Adhesive layer 31 Enclosure 32 Disk 33 Carriage arm 35 Magnetic head assembly 36 Main actuator

Claims (5)

A slider on which a magnetic head is mounted, a suspension having a distal end disposed opposite to the slider, and a slider connected between the slider and the suspension, for rotating the slider about an axis perpendicular to a sliding surface of the slider A magnetic head assembly comprising:
At an axial position perpendicular to the sliding surface of the slider and passing through the center of gravity of the slider, the slider is coupled to the suspension via a connecting member,
Between the slider and the suspension, a plurality of piezoelectric elements for generating a rotational driving force of the piezoelectric actuator cooperate with each other when contracted to generate a rotational driving force in the same direction. A magnetic head assembly, wherein one end of each piezoelectric element in the rotation direction of the slider is adhered to the slider, and the other end is adhered to the suspension. The piezoelectric elements in the piezoelectric actuator are arranged on a plane parallel to the sliding surface of the slider at equal angular intervals around the axis passing through the center of gravity in the same rotational driving direction. The magnetic head assembly according to claim 1, wherein 3. The magnetic head assembly according to claim 2, wherein a pair of identically shaped piezoelectric elements disposed around an axis passing through the center of gravity is used as a piezoelectric element in the piezoelectric actuator. 4. The magnetic head assembly according to claim 3, wherein an interval between the pair of piezoelectric elements is increased around an axis passing through the center of gravity. A slider on which a magnetic head is mounted, a suspension having a distal end disposed opposite to the slider, a slider disposed between the slider and the suspension, connecting the slider to the suspension, and connecting the slider to a sliding surface of the slider. A magnetic head assembly including a piezoelectric actuator that is driven to rotate about a vertical axis;
A carriage arm having a suspension of the magnetic head assembly attached to a tip end;
A magnetic disk drive comprising: a main actuator for rotating the carriage arm on a surface parallel to a sliding surface of the slider to move the magnetic head in a track width direction of the disk;
At an axial position perpendicular to the sliding surface of the slider and passing through the center of gravity of the slider, the slider is coupled to the suspension via a connecting member,
Between the slider and the suspension, a plurality of piezoelectric elements for generating a rotational driving force of the piezoelectric actuator cooperate at the time of contraction to generate a rotational driving force in the same direction, around the connecting member. A magnetic disk drive, wherein one end of each piezoelectric element in the rotation direction of the slider is bonded to the slider, and the other end is bonded to the suspension.

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