KR20060064496A - Small size optical/magnetic head actuator with a pivot hinge and a halbach array magnet - Google Patents

Abstract

Provides an ultra-compact optical / magnetic head actuator. The present invention provides a swing arm equipped with a head for reading information on a disk or recording information on a disk, and a swing arm capable of moving in a horizontal direction and a vertical direction, and moving the swing arm in a horizontal direction (tracking direction) with respect to the disk. It includes a tracking actuator that can be. In addition, the present invention includes a pivoting hinge for adjusting the rotation radius of the swing arm and guiding the tracking direction movement of the swing arm, and a focusing actuator capable of moving the swing arm in a vertical direction (focusing direction) with respect to the disc. do. The focusing actuator includes a focusing coil attached to a lower portion of the swing arm and a halva array magnet positioned below the focusing coil. Accordingly, the present invention can reduce the non-repetitive error without friction or backlash, and can significantly reduce the thickness of the micro storage device by using a halva array magnet.

Description

Small size optical / magnetic head actuator with a pivot hinge and a halbach array magnet

1 and 2 are a front view and a plan view of a micro storage device including a micro light / magnetic head actuator according to the present invention.

3 and 4 are schematic and exploded views for explaining the ultra-compact optical / magnetic head actuator according to the present invention.

5 and 6 are diagrams showing the pressure distribution according to the rotation center and the load of the pivot hinge according to the present invention, respectively.

7 is an exploded view for explaining a focusing actuator according to the present invention.

8 is a view for explaining the movement state of the swing arm by the focusing actuator according to the present invention.

9 and 10 are cross-sectional views and perspective views of the halva array magnet constituting the focusing actuator according to the present invention.

FIG. 11 is a diagram for explaining a halva array magnet used in the focusing actuator of the present invention. FIG.

12 is a schematic diagram for explaining in detail the driving of the optical / magnetic head actuator according to the present invention.

Explanation of symbols on the main parts of the drawings

102: swing arm 100: tracking actuator 112: pivot hinge

402: focusing coil 404: halva array magnet 408: focusing actuator

FIELD OF THE INVENTION The present invention relates to optical / magnetic head actuators and, more particularly, to ultra-compact optical / magnetic head actuators.

In general, as information technology is widely used, high density, large capacity and ultra small data storage devices have become important. Flash memory as a data storage device is excellent in mobility, stability, reproducibility, etc., but has disadvantages in terms of integration and price due to semiconductor process limitations. Accordingly, optical / magnetic data storage devices using optical media such as CDs and DVDs or magnetic media such as hard disks are widely used.

The optical / magnetic data storage device includes an optical / magnetic head and an optical / magnetic head actuator for driving the optical / magnetic head to read or write information on optical media or magnetic media. Examples of the optical head actuators include U.S. Patent Nos. 6,768 and 601, which are inventors Chae Min Ju and assignee LG Electronics, registered on July 27, 2004 under the name "positioning unit for lenses of optical pickup devices." have. The Chae patent uses six wires to control the position of the lens in the focusing direction and the tracking direction. However, the Chae patent is not suitable for a miniature optical head actuator (miniature optical pickup drive) because the thickness is considerably thick using a common magnet for driving in the focusing direction.

An example of the magnetic head actuator is the inventor, Toshisada Koyama, Yasuhiro Mouri, the assignee is Minebea Kabushiki-kaisha, and as of March 6, 2003, "Pivoting bearing for swing arm of hard disk dryer". US Publication No. 2003/0044096, published by name. The Toshisada published patent uses a pivot bearing to move the swing arm in a rotational direction (tracking direction). However, when the rotary motion using the pivot bearing has a problem that the friction or backlash occurs structurally, non-repetitive error due to the bearing gap.

Accordingly, the technical problem to be achieved by the present invention is to solve the above-described problems, to provide a micro-optical / magnetic head actuator that can be miniaturized because the thickness is low, but can also reduce the non-repetitive error without friction or backlash There is.

In order to achieve the above technical problem, the ultra-compact optical / magnetic head actuator of the present invention is equipped with a swing arm that is mounted to the head to read information on the disk or write information on the disk, and movable in the horizontal and vertical directions, and And a tracking actuator capable of moving the swing arm in a horizontal direction (tracking direction) with respect to the disk. The tracking actuator may be configured as a voice coil motor.

In addition, the micro-optical / magnetic head actuator of the present invention has a pivot hinge that adjusts the radius of rotation of the swing arm and guides the tracking arm movement in the tracking direction, and the swing arm is perpendicular to the disc. A focusing actuator capable of moving in a direction (focusing direction). The pivot hinge may include two flexible hinges configured to cross each other.

The focusing actuator may include a focusing coil attached to a lower portion of the swing arm and a halva array magnet positioned below the focusing coil to reduce the thickness of the ultra-compact optical / magnetic head actuator. The halva array magnet may be arranged in an arc shape in a direction in which the swing arm rotates. The halva array magnet may include a magnet having a horizontal magnetization direction to move the swing arm in a vertical direction by Fleming's left hand law.

As described above, since the ultra-compact optical / magnetic head of the present invention guides the swing arm to rotate with a pivot hinge installed by crossing two flexible hinges, friction and backlash are more comparable to guiding rotational motion using a conventional bearing. Non-repeatable error can be reduced. In addition, the micro-optical / magnetic head of the present invention can greatly reduce the thickness of the micro-storage device by using a halva array magnet in the focusing actuator.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the embodiments of the present invention illustrated in the following may be modified in many different forms, and the scope of the present invention is not limited to the embodiments described below, but may be implemented in various different forms. The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. In the drawings, the size or thickness of films or regions is exaggerated for clarity.

1 and 2 are a front view and a plan view of a micro storage device including a micro light / magnetic head actuator according to the present invention.

Specifically, in order to explain the ultra-compact optical / magnetic head actuator of the present invention, the ultra-compact optical head actuator is used in FIGS. 1 and 2 for convenience. Ultra-small magnetic actuators are identical to optical head actuators except that they use magnetic heads instead of optical heads and magnetic media (magnetic disks) instead of optical media. Micro-storage devices incorporating micro-optical / magnetic head actuators have a thickness of 43 mm or less, 36 mm or less, and 5 mm or less in width, length, and height (thickness), respectively.

More specifically, the optical / magnetic head actuator of the micro-storage device of the present invention is equipped with a head 104 (optical head) and a lens 106 to read information from or write information to the disk 110. A swing arm 102. In other words, the head 104 and the lens 106 are mounted on one end (front end) of the swing arm 102. The disk 110, which can be rotated by the spindle motor 108 and the motor shaft 109, is positioned above the lens 106.

At the other end (back end) of the swing arm 102 is a voice coil motor, which is a tracking actuator 100 that can move the swing arm 102 in a horizontal direction (tracking direction) with respect to the disk 110. At the front end of the tracking actuator 100, a pivot hinge 112 is positioned to adjust the radius of rotation and to guide the tracking direction movement of the swing arm 102. The structure of the tracking actuator 100 and the structure of the pivot hinge 112 will be described later in detail.

In addition, the optical / magnetic head actuator of the micro storage device of the present invention includes a focusing actuator (408 in FIG. 3) capable of moving the swing arm 102 in a vertical direction (focusing direction) with respect to the disk 110. . The focusing actuator 408 consists of a focusing coil 402 of FIG. 3 and a halva array magnet 404. The focusing coil is attached to the bottom of the swing arm 102 as described later, and a halbach array magnet 404 is located at the bottom of the deck below the focusing coil. The focusing coil and halva array magnet 404 will be described later in detail. The focusing actuator exerts a force by the Fleming left hand law to move the swing arm 102 in the vertical direction. 1 and 2, reference numeral 115 denotes a PCB substrate, and reference numerals 116 and 118 denote a laser diode and an optical fiber.

3 and 4 are schematic and exploded views for explaining the ultra-compact optical / magnetic head actuator according to the present invention. In Figs. 3 and 4, the same reference numerals as in Figs. 1 and 2 denote the same members.

Specifically, the optical / magnetic head actuator of the micro-storage device of the present invention includes a tracking actuator 100 capable of moving the swing arm 102 in the horizontal direction (tracking direction) as described above. The tracking actuator 100 is composed of a voice coil motor. The voice coil motor used as the tracking actuator 100 includes a permanent magnet 206 and a voice coil positioned between the upper yoke 202, the lower yoke 204, the upper yoke 202, and the lower yoke 204. 208.

The permanent magnet 206 is attached to the lower portion of the upper yoke 202 and positioned to traverse the voice coil 208 of a rectangular shape having a hollow center. The driving force for moving the tracking actuator 100 is obtained from the current relation flowing through the permanent magnet 206 and the voice coil 208. The force F for moving the tracking actuator 100 is BILN. Where B is the magnetic flux density, I is the current flowing through the voice coil, L is the conductor length, and N is the number of coil turns. The direction in which the tracking actuator moves is based on Fleming's left hand law.

The tracking actuator 100 is connected to a pivot hinge 112 that adjusts the radius of rotation of the swing arm 102. The pivot hinge 112 includes a protruding support part 302 capable of supporting the voice coil 208 from the outside, a circular rotation guide part 304 connected to the protruding support part 302, and the rotation guide part ( Installed alternately between the first and second rotors 306 and 308, which are spaced apart from each other in the 304, and between the first and second rotors 306 and 308. Two flexible hinges 310 and a base support 312 for supporting the first rotating body 306, the second rotating body 308 and the rotating guide portion 304 from the bottom. The flexible hinge 310 is composed of a steel plate. The two flexible hinges 310 may be installed to cross each other, and the angle 314 formed by crossing the two flexible hinges 210 may be 90 degrees or other angles.

The first rotating body 306 and the rotating guide portion 304 are attached to each other, and the second rotating body 308 is spaced apart from the rotating guide portion 304. The first rotating body 306 and the rotating gage 304 are bonded with an epoxy adhesive. As a result, when the voice coil 208 of the tracking actuator 100 and the protruding support 302 connected thereto move in the tracking direction, the second rotating body 308 of the pivot hinge 112 moves in the tracking direction to rotate. While swing arm 102 is moved in the tracking direction.

In this regard, the movement of the swing arm 102 will be described in more detail. As described above, the tracking actuator 100 includes a permanent magnet 206 and a voice coil 208. When current flows through the voice coil 208, a force is generated in the vertical direction of the magnetic flux distribution and the current direction of the coil by Fleming's left-hand law. In the swing arm of the present invention, the direction of the force is a direction for moving the swing arm 102 in the tracking direction. Here, the voice coil 208 is bonded to the protruding support 302, and the force generated in the voice coil 208 is transmitted to the swing arm 102 through the protruding support 302.

The pivot hinge 112 adjusts the radius of rotation when the swing arm 102 moves in the tracking direction. When the swing arm is rotated using the pivot hinge 112, the center of rotation of the tracking direction is the center portion of the flexible hinge 310 mounted in a staggered manner. That is, the pivot hinge 112 becomes a rotation center when the swing arm 102 rotates in the tracking direction. Inside the pivoting hinge 112, two flexible hinges 310 are staggered as shown in FIG. 6 later, as shown in FIG. It becomes the center of rotation of (102).

Particularly, since the pivot hinge 112 of the present invention guides the swing arms in the tracking direction by installing two flexible hinges 310 alternately with each other, the pivoting hinge 112 may use friction to guide the rotational movement using a conventional bearing. There is no backlash and nonrepetitive errors can be reduced. Furthermore, since the pivot hinge 112 of the present invention guides the swing arms in the tracking direction by installing the two flexible hinges 310 alternately with each other, the pivoting hinge 112 minimizes the translational motion generated while rotating in the other direction (reverse direction). Can increase the rigidity.

In other words, the two flexible hinges 310 cross each other and the point becomes the center (rotation axis) when the swing arm moves in the rotational direction, which serves as a conventional rotating bearing. The flexible hinge 310 is like a spring, the bending occurs by the force generated by the permanent magnet 206 and the coil 208 and the swing arm 102 is a rotational movement occurs. In other words, it guides the rotational movement to occur. When the force in the direction of rotation is lost, it is returned to its original state by the spring force of the flexible hinge (102). One flexible hinge may serve as a guide of the rotary motion, but the present invention minimizes the twist of the rotary shaft by using two flexible hinges because the phenomenon that the rotary shaft is distorted during the rotary motion occurs.

A swing arm 102 is connected to the pivot hinge 112, and a head 104 and a lens 106 are mounted at one end (front) of the swing arm 112. A lower portion of the swing arm 102 includes a focusing actuator 408 capable of moving the swing arm 102 in a vertical direction (focusing direction) with respect to the disk 110.

The focusing actuator 408 of the present invention consists of a focusing coil 402 and a halva array magnet 404. In particular, the focusing actuator of the present invention uses a halva array magnet to reduce the thickness of the micro storage device. A yoke 406 may or may not be provided below the halva array magnet 404. The yoke 406 is preferably not installed because it increases the thickness of the ultra-compact optical / magnetic head actuator.

The focusing coil 402 is attached to a lower portion of the swing arm 102, and the halva array magnet 404 is configured in an arc shape with respect to the rotation center in the tracking direction. In other words, the focusing coil 402 is attached to the lower portion of the swing arm 102 and the halva array magnet 404 is attached to the swing arm 102 when the swing arm 102 rotates. A circular arc shape is formed at the lower part of the swing arm following the movement of the arm. The focusing actuator 408 exerts a force by Fleming's left hand law. The focusing actuator 408 will be described later in detail. 3 and 4, reference numeral 120 denotes a lens holder.

5 and 6 are diagrams showing the stress distribution according to the rotation center and the load of the pivot hinge according to the present invention, respectively.

Specifically, FIG. 5 is a result of computer numerical analysis performed to confirm whether the center of rotation of the pivot hinge structure, which is actually composed of two flexible hinges, is the point where the two flexible hinges are crossed, and FIG. The same result is seen in three dimensions.

The lower left quadrangle of FIG. 5 corresponds to the second rotary body 308 of FIG. 4, and the upper right quadrangle corresponds to the first rotary body 306 of FIG. 4, and the staggered flexible hinge connecting the two squares is Corresponds to the flexible hinge 310 of FIG. The flexible hinge guides the rotational motion when the swing arm is forced in the direction of rotation, ie when the upper right square of FIG.

It can be seen from FIGS. 5 and 6 that the center of the rotary motion (rotation axis) is a point where two flexible hinges are crossed. In addition, as shown in FIG. 5, since the two steel plates constituting the flexible hinge are staggered, since the rotation center is formed near the point where the two steel plates meet, the rotation radius is smaller than that of the hinge made of one steel plate.

In addition, since the flexible hinge is elastic like a spring, stress is generated when the force is applied in the rotational direction, and FIGS. 5 and 6 show this stress distribution. This stress distribution is used to design the thickness and size of the flexible hinge.

In addition, as shown in FIG. 6, in the stress distribution distributed in the steel sheets constituting the flexible hinge, in the case of the hinge made of one steel sheet, the maximum stress exists at the end of the steel sheet, but the two are staggered. In the flexible hinge composed of a double steel sheet, the maximum stress is generated at the center of the steel sheet, the rotation radius is reduced.

7 is an exploded view for explaining a focusing actuator according to the present invention, Figure 8 is a view for explaining the movement state of the swing arm by the focusing actuator according to the present invention. In Figs. 7 and 8, the same reference numerals as in Figs. 3 and 4 denote the same members.

Specifically, as shown in FIGS. 7 and 8, the focusing coil 402 of the focusing actuator of the present invention is vertically driven by a magnetic force generated by the halva array magnet 404 mounted to the lower portion of the swing arm 102. Driving in the focusing direction). As shown in FIG. 8, the halva array magnet 404 is configured in an arc shape around the direction in which the swing arm 102 rotates to uniformly distribute the magnetic flux in the vertical direction even when the swing arm 102 rotates. Keep it.

9 and 10 are cross-sectional views and perspective views of the halva array magnet constituting the focusing actuator according to the present invention.

Specifically, as shown in FIGS. 9 and 10, the halva array magnet 404 of the present invention includes a first magnet 404a, a second magnet 404b, a third magnet 404c, and a fourth in the x-axis direction. The magnet 404d and the fifth magnet 404e consist of a magnet assembly assembled in parallel. The magnet assembly may use an alloy made of Nd-Fe-B. The magnet assembly may have various sizes. As an optimal value, the height of the magnet assembly (z direction in FIG. 10) is 2 mm, and the width (x-axis direction in FIG. 10) of the first magnet 404a is 1 mm. The width of the second magnet 404b is 1mm, the width of the third magnet 404c is 2mm, the width of the fourth magnet 404d is 1mm, and the width of the fifth magnet 404e is 2mm. The halva array magnet 404 will be described in more detail later.

The magnetization direction of the first magnet 404a and the fifth magnet 404e is a vertical direction (vertical direction, z-axis direction) of N type on the upper side, and the magnetization direction of the second magnet 404b is N type of horizontal on the left side. Direction (horizontal direction, x-axis direction), the magnetization direction of the third magnet 404c is a vertical direction of which the lower side is N-type, and the magnetization direction of the fourth magnet 404d is a horizontal direction of which the N-type is right.

In particular, when using the halva array magnet 404 of the present invention, the flux line (indicated by the dotted line in FIG. 9) increases on the upper surface of the halva array magnet 404 and disappears on the lower surface of the halva array magnet 404. . Accordingly, the present invention moves the focusing coil 402 in the vertical direction by using the second magnet 404b and the fourth magnet 404d having the horizontal magnetization direction. In Fig. 9, reference numeral 402a denotes a body of the focusing coil, and 402b denotes a coil portion of the focusing coil.

FIG. 11 is a diagram for explaining a halva array magnet used in the focusing actuator of the present invention. FIG.

Specifically, two examples of halva array magnets that can be used in the present invention can be used. The first and second examples are assemblies of four general magnets for comparison with the present invention, and the third and fourth examples are assemblies of five magnets as halva array magnets as shown in FIG. The first and third examples do not use a yoke at the bottom, and the second and fourth examples use a yoke at the bottom. The third and fourth examples include magnets in which the magnetization direction is in the transverse direction, and the first and second examples are only magnets in which the magnetization direction is in the longitudinal direction. The dotted line on the magnet array represents the flux line. In FIG. 11, the magnet is provided with a focusing coil.

As shown in Fig. 11, it can be seen that the third and fourth examples have a good driving force for driving the focusing coil. The numerical values in parentheses are relative values when the driving force of the fourth example is 100%. As for the magnetic flux uniformity, 3rd example and 4th example are preferable, and thickness is preferable the 1st example and 3rd example which do not use a yoke. Therefore, the halva array magnet used in the focusing actuator of the present invention can be determined to be the third example most appropriate in consideration of driving force, magnetic flux uniformity, and thickness, and a fourth example can be used if necessary.

12 is a schematic diagram for explaining in detail the driving of the optical / magnetic head actuator according to the present invention. In Fig. 12, the same reference numerals as in Figs. 1, 3 and 4 denote the same members.

Specifically, the optical / magnetic head actuator according to the present invention uses the tracking actuator 100 to move the swing arm 102 in the horizontal direction (tracking direction) with respect to the rotating disk. When the swing arm 102 is moved horizontally, the axis of rotation of the tracking actuator 100 is near the center of the pivot hinge 112. Arrows shown in the tracking actuator 100 indicate the magnetization direction of the upper and lower yokes.

A focusing actuator 408 is used that can move the swing arm 102 in a vertical direction (focusing direction) with respect to the rotating disk 110. The focusing actuator 408 is composed of a focusing coil 402 and a halva array magnet 404 as described above. The focusing coil 402 is attached to the lower portion of the swing arm 102, and the halva array magnet 114 is positioned below the focusing coil 402. The focusing coil 402 has a driving force in the vertical direction by the magnet having the magnetic flux direction in the horizontal direction among the halva array magnets 404 to move the swing arm in the focusing direction.

As described above, the ultra-compact optical / magnetic head of the present invention adjusts the radius of rotation of the tracking actuator that can move the swing arm in the horizontal direction (tracking direction) with respect to the disc, and pivot pivot for guiding rotation of the swing arm in the tracking direction. Include. Since the pivot hinge of the present invention guides the swing arm to rotate by installing two flexible hinges, there is no friction or backlash and a non-repetitive error can be reduced compared to using a conventional bearing to guide the rotational motion.

In addition, the ultra-compact optical / magnetic head of the present invention uses a halva array magnet in a focusing actuator capable of moving the swing arm in a vertical direction (focusing direction) with respect to the disc. The use of Halva array magnets for focusing actuators can greatly reduce the thickness of micro storage devices.

Claims (19)

A swing arm mounted with a head for reading information on or recording information on the disk, the swing arm being movable in a horizontal direction and a vertical direction; A tracking actuator capable of moving the swing arm in a horizontal direction (tracking direction) with respect to the disc; A pivot hinge for adjusting a rotation radius of the swing arm and guiding a movement of the swing arm in a tracking direction; And And a focusing actuator capable of moving the swing arm in a vertical direction (focusing direction) with respect to the disc, wherein the focusing actuator includes a focusing coil attached to a lower portion of the swing arm and a halva array magnet positioned below the focusing coil. Ultra-compact optical / magnetic head actuator, characterized in that the thickness can be made smaller. The micro-optical / magnetic head actuator of claim 1, wherein the tracking actuator is comprised of a voice coil motor. The micro-optical / magnetic head actuator of claim 1, wherein the pivot hinge includes two flexible hinges configured to cross each other. 4. The micro-optical / magnetic head actuator as claimed in claim 3, wherein the pivot center of rotation is the center portion of the flexible hinge which is mounted staggered. The micro-optical / magnetic head actuator of claim 1, wherein the pivot hinge includes two flexible hinges configured to cross each other at 90 degrees. The ultra-compact optical / magnetic head actuator according to claim 1, wherein the halva array magnet is arranged in an arc shape in a direction in which the swing arm rotates. The magnet array of claim 1, wherein the halva array magnet is a magnet assembly in which a first magnet, a second magnet, a third magnet, a fourth magnet, and a fifth magnet are assembled in parallel, and magnetization of the first magnet and the fifth magnet. The direction is the vertical direction of the upper side is N-type, the second magnet is the horizontal direction of the left side is N-type, the third magnet is the vertical direction of the lower side is N-type, the fourth magnet is the horizontal direction of the right side is N-type Ultra-compact optical / magnetic head actuator. The micro-optical / magnetic head actuator of claim 1, wherein a yoke is further provided below the halva array magnet. The ultra-compact optical / magnetic head actuator according to claim 1, wherein the halva array magnet has a magnet having a horizontal magnetization direction and is capable of moving the swing arm in a vertical direction by Fleming's left hand law. A swing arm mounted with a head for reading information on or recording information on the disk, the swing arm being movable in a horizontal direction and a vertical direction; A voice coil motor installed at one end of the swing arm to move the swing arm in a horizontal direction (tracking direction), and comprising a magnet and a voice coil positioned between an upper yoke, a lower yoke, the upper yoke and a lower yoke. A configured tracking actuator; A protruding support connected to the voice coil of the tracking actuator, a circular rotating guide connected to the protruding support, a first rotating body and a second rotating body spaced apart from each other in the rotating guide, and the first rotating body and the first rotating body. It consists of two flexible hinges installed alternately between the two rotating bodies and a base support for supporting the first rotating body, the second rotating body and the rotating guide part from the bottom, to guide rotation of the swing arm. A pivot hinge for adjusting a radius of rotation; And And a focusing actuator configured to include a focusing coil attached to the lower portion of the swing arm and a halva array magnet positioned below the focusing coil to move the swing arm in a vertical direction (focusing direction) with respect to the disk. Ultra-compact optical / magnetic head actuators. 11. The micro-optical and magnetic magnet as claimed in claim 10, wherein a magnet constituting the tracking actuator is attached to a lower portion of the upper yoke, and the voice coil is attached to the protrusion and has a rectangular shape with an empty center. Head actuator. 12. The optical / magnetic head actuator of claim 11, wherein a magnet constituting the tracking actuator is positioned to traverse a rectangular voice coil attached to a lower portion of the upper yoke and having a hollow center. The swing arm of claim 10, wherein the first rotating body and the rotating guide part of the pivot hinge are attached to each other, and the second rotating body has a gap with the rotating guide part so that the protruding support moves in the tracking direction. An optical / magnetic head actuator characterized by moving in this tracking direction. 11. The micro-optical / magnetic head actuator as claimed in claim 10, wherein the pivot center of rotation is the center portion of the flexible hinge which is mounted staggered. 11. The micro-optical / magnetic head actuator of claim 10, wherein the flexible hinges constituting the pivot hinge are configured to intersect with each other at 90 degrees. 11. The ultra-compact optical / magnetic head actuator according to claim 10, wherein the halva array magnet is arranged in an arc in a direction in which the swing arm rotates. The magnet assembly of claim 10, wherein the halva array magnet is a magnet assembly in which a first magnet, a second magnet, a third magnet, a fourth magnet, and a fifth magnet are assembled in parallel, and magnetization of the first magnet and the fifth magnet is performed. The direction is the vertical direction of the upper side is N-type, the second magnet is the horizontal direction of the left side is N-type, the third magnet is the vertical direction of the lower side is N-type, the fourth magnet is the horizontal direction of the right side is N-type Ultra-compact optical / magnetic head actuator. The micro-optical / magnetic head actuator of claim 10, wherein a yoke is further provided below the halva array magnet. 11. The micro-optical / magnetic head actuator of claim 10, wherein the halva array magnet includes a magnet having a horizontal magnetization direction to move the swing arm in a vertical direction by Fleming's left-hand rule.

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