JP4062201B2 - Head support device, head drive device, and disk device - Google Patents

Description

  The present invention relates to a head support device, a head drive device, and a disk device using the head support device for performing recording and reproduction on a disk using a head.

  Due to the rapid expansion of the market for portable electronic devices (PDA, mobile phones, etc.) and the miniaturization of devices in recent years, the disk device, which is one of the data storage methods, has higher portability, that is, smaller and thinner. There is a demand for shaping, high impact resistance and high reliability. In order to satisfy this high impact resistance, various methods have been proposed as disk devices.

  As an example of a conventional disk apparatus having a head, a conventional disk apparatus in a magnetic recording / reproducing apparatus such as a hard disk apparatus will be described with reference to the drawings.

  FIG. 9 is a plan view showing the configuration of a conventional magnetic recording / reproducing apparatus. In FIG. 9, the head support device 108 includes a suspension 102 having a relatively low rigidity, a leaf spring portion 103 and a support arm 104 having a relatively high rigidity. A magnetic head (not shown) is provided on the lower surface of one end of the suspension 102. A mounted slider 101 is provided.

  The magnetic recording medium 107 is provided so as to be rotated by a spindle motor 109. During recording / reproduction of the magnetic recording / reproducing apparatus, a levitation force caused by an air flow generated in the slider 101 due to the rotation of the magnetic recording medium 107, and the slider 101 The magnetic head mounted on the slider 101 floats a certain distance from the magnetic recording medium 107 due to the relationship with the urging force by the head support device 108 that urges the magnetic recording medium 107 to the magnetic recording medium 107 side. The head support device 108 rotates around the bearing portion 105 by the action of the voice coil 106 provided on the support arm 104 at the time of recording and reproduction, and the magnetic head mounted on the slider 101 desires the magnetic recording medium 107. Recording / reproduction is performed with respect to the track.

  The magnetic recording / reproducing apparatus shown in FIG. 9 is a magnetic recording / reproducing apparatus generally called a contact start / stop system (hereinafter referred to as CSS system), and the magnetic head is placed on the magnetic recording medium 107 when the magnetic recording medium 107 is stopped. Although in contact, the magnetic head provided on the slider 101 floats from the magnetic recording medium 107 during recording and reproduction. In the case of such a CSS method, the magnetic recording medium 107 is divided into a magnetic recordable area A and an area B in which the magnetic head is retracted when stopped as shown in FIG. When stopping the rotation of the magnetic recording medium 107, first, the magnetic head is moved to the region B while being levitated, and the rotation of the magnetic recording medium 107 is decreased. The air flow decreases, the levitation force decreases, and the magnetic head finally comes into contact with the magnetic recording medium 107 and stops in that state.

  For this reason, in the magnetic recording medium 107 in the CSS system, the surface of the region B is formed to be rougher than the surface of the region A, so that the magnetic head is attracted to the magnetic recording medium 107 when the rotation of the magnetic recording medium 107 is stopped and is restarted. The problem of mechanically and magnetically damaging the magnetic recording medium 107 was prevented.

  As another method for supporting the head, there is a load / unload method (hereinafter referred to as L / UL method). FIG. 10 is a schematic perspective view of an L / UL magnetic recording / reproducing apparatus. In FIG. 10, the head support device 108 has a configuration substantially similar to that of the CSS system head support device 108 shown in FIG. 9, but when the magnetic recording / reproducing apparatus is stopped, the head support device 108 is centered on the bearing portion 105. It rotates and moves to the outside of the magnetic recording medium 107. At this time, a magnetic head holding unit 110 is provided outside the magnetic recording medium 107, and a protrusion 111 provided at the tip of the suspension 102 is run on the taper portion, thereby the slider 101 and the magnetic head. The magnetic recording medium 107 is held apart.

  In the head support device of the magnetic recording / reproducing apparatus, an urging force for urging a predetermined load toward the magnetic recording medium is applied to the slider mainly by the leaf spring portion, and the suspension is configured to have flexibility. This prevents the so-called off-track in which the head is displaced from a predetermined track position of the disk even if the disk is moved up and down during recording / reproduction on the disk and the head moves from a predetermined track position of the disk. Even so, it is possible to follow up sufficiently. Therefore, it is required that the urging force necessary for urging the slider in the disk surface direction is reliably secured by the leaf spring portion.

  In addition, manufacturing variation occurs in the suspension, and the urging force in the disk surface direction by the leaf spring portion formed by bending the suspension portion varies. In order to absorb these fluctuations and stably maintain the distance between the head and the disk, it is necessary to further reduce the rigidity of the spring portion of the suspension. However, when the rigidity of the spring portion of the suspension is lowered, the resonance frequency is lowered, and an unstable phenomenon in which a vibration mode such as bending or torsion occurs occurs, which causes the head to be off track.

  Further, in the conventional head support mechanism, the center of gravity is located closer to the portion where the head is attached than the leaf spring portion. For this reason, when a strong external impact is applied to the magnetic recording / reproducing apparatus, the balance between the levitation force caused by the air flow generated by the rotation of the disk and the urging force that urges the slider toward the disk is lost in the slider portion. The phenomenon that the slider jumps from the disk surface is likely to occur. When such a jump occurs, the slider may collide with the disk, and the disk may be magnetically or mechanically damaged. Such a problem applies not only to the above-described magnetic recording / reproducing apparatus but also to a disk apparatus having a flying head, such as an optical disk apparatus or a magneto-optical disk apparatus.

  The present invention has been made to solve these problems, and has ensured a stable urging force without being affected by manufacturing variations, and used a head support device, a head drive device, and a head support device excellent in impact resistance. An object is to provide a disk device.

The head support device of the present invention includes a head that performs at least one of recording and reproduction with respect to a disk;
A head support member composed of the head, a head attachment portion to which the head is attached, and a support arm to which the head attachment portion is attached to one end;
A base arm provided with a rotation support portion that supports the head support member to be rotatable in a direction perpendicular to the disk surface;
One end is connected to the other end of the support arm, the other end is connected to the base arm, and an elastic member for applying a biasing force to bias the head support member in the disk direction is provided. Prepared,
The position of the center of gravity of the head support member is disposed on the rotation axis of the rotation support portion provided on the base arm,
The base arm is inclined at a predetermined angle such that the support arm applies a biasing force to the disk surface ,
While providing the rotation support part at a position where the head mounting part is displaced in the pressing direction of the rotation support part against the pressing of the rotation support part of the base arm,
The elastic member is a leaf spring, and the elastic member has a length L ₁ from a connection portion connected to the support arm to a fixed portion fixed to the base arm, and the rotation support portion to the connection portion. Ri Oh ratio L _{2 /} L ₁ is 0.5 and the length L ₂ of the up and to the longitudinal center line of the support arm provided between said supporting arm and said base arm A head support device characterized in that it is a bilaterally symmetric leaf spring member .

With this configuration, the head support member can be provided directly on the base arm, so that the rigid member and the elastic member can be provided independently. Therefore, the support arm portion can be provided on the base arm with high rigidity, and thereby the resonance frequency can be set high. Further, the head mounting portion can be always providing pivot support portion in a position to displace downwardly, it is possible to apply a biasing force stably to the head mounting portion, with a simple structure as an elastic member, the load load Since the spring constant can be made relatively small, it is possible to suppress variations in load load even if variations in mounting of the support arm occur.

  Furthermore, the head support device of the present invention is configured such that the support arm is displaced substantially parallel to the pressing of the rotation support portion of the base arm. With this configuration, since the spring constant of the load load applied to the head mounting portion can be minimized, it is possible to obtain a stable load load that is not affected by a pressing amount change due to manufacturing variation of the rotation support portion.

  In the head support device of the present invention, the elastic member is a plate spring member that is symmetrical with respect to the center line in the longitudinal direction of the support arm provided between the base arm and the support arm. For this reason, it is easy to process, and since it is easy to process into an arbitrary shape that can optimize the bending stress generated with respect to the deformation of the leaf spring, it is easy to reduce the size and weight of the head support device.

  In the head support device of the present invention, the position of the center of gravity of the head support member is disposed on the rotation shaft of the rotation support portion provided on the base arm. With this configuration, even when a vertical or horizontal impact is applied to the disk surface from the outside to the disk device including the head support mechanism, the center of gravity of the head support member is located on the rotation axis. There is no rotation. For this reason, it is possible to realize a head support device in which the slider hardly collides with the disk and has excellent impact resistance.

  Furthermore, the head drive device of the present invention is a head support device, a bearing that pivotally supports the head support device in a direction parallel to the disk surface, and rotates the head support device in a direction parallel to the disk surface. Driving means, and the configuration using the head support device described above. With this configuration, it is possible to realize a small head driving device that has high impact resistance and can stably obtain a load load without being affected by manufacturing variations.

  Further, since the base arm of the head support device is arranged at a predetermined angle with respect to the disk surface, it is possible to apply an optimum load load.

  Further, the disk device of the present invention comprises a disk, a rotational driving means for driving the disk, and the above-described head driving device for writing to or reading from a predetermined track position of the disk. Have With this configuration, it is possible to realize a small and thin disk device that is excellent in impact resistance, can stably obtain a load load without being affected by manufacturing variations, and can be accessed at high speed.

  As described above, the head support device of the present invention can always apply a stable urging force to the head, and can realize a head support device with excellent impact resistance. With these head support devices, it is possible to realize a highly reliable, small and lightweight head drive device and disk device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
1, 2 and 3 are views showing a head support device according to Embodiment 1 of the present invention. FIG. 1 is a perspective view showing a configuration of a main part of the head support device, and FIG. FIG. 3 is an exploded perspective view of the main part. Hereinafter, a magnetic recording / reproducing apparatus will be described as an example of the disk apparatus.

  1, 2, and 3, a slider 1 that is a head mounting portion on which a magnetic head (not shown) is mounted has a so-called gimbal device in which a thin metal plate such as SUS and a flexible wiring board are integrated. The flexure 2 is fixed to the support arm 3. The top of the dimple 3a provided on the support arm 3 is in contact with the flexure 2 so that the slider 1 fixed to the flexure 2 can freely move around the top of the dimple 3a.

  The support arm 3 is formed with a leaf spring portion 5 which is an elastic member having a tongue-like shape by cutting out a part near the center line 4 in the longitudinal direction, and one end of the leaf spring portion 5 is a base arm. One base arm 6 is fixed by a known method such as spot welding, ultrasonic welding, or laser welding. The leaf spring portion 5 may be composed of a separate material member different from the support arm 3. When the leaf spring portion 5 is made of a separate material member, the leaf spring having a tongue-like shape is formed by a method such as the well-known welding method described above. One end of the material member is fixed to the support arm 3 and the other end is fixed to the first base arm 6.

  Further, the first base arm 6 is provided with two pivots 7 which are rotational support portions at positions symmetrical with respect to the center line 4 in the longitudinal direction of the support arm 3. The respective apexes of the pivots 7 are in contact with the support arm 3. Accordingly, the elastic force of the leaf spring portion 5 of the support arm 3 fixed to the first base arm 6 is set with the vertices of the two pivots 7 disposed on the first base arm 6 as pivot points. The support arm 3 is pressed against and rotated. Therefore, a biasing force is applied to bias the slider 1 toward the recording medium so that the slider 1 fixed to the support arm 3 presses the surface of the recording medium (not shown). Furthermore, the other end of the first base arm 6 is formed with a coupling portion 9 made of, for example, a hollow cylindrical projection for integration with the second base arm 8 which is a base arm.

  Further, the center of gravity of the head support member composed of the slider 1, the flexure 2, the support arm 3 and the balancer 22 is each of the two pivots 7 disposed on the first base arm 6 which is the pivot point of the support arm 3. It is configured to pass through a line connecting the vertices. A head support arm 10 is constituted by the slider 1, the flexure 2, the balancer 22, the support arm 3 having the leaf spring portion 5, and the first base arm 6 on which the magnetic head is mounted. Further, a part of the support arm 3 in the vicinity of the center line 4 in the longitudinal direction is cut out to form a leaf spring portion 5, and the left and right side surfaces of the support arm 3 are respectively continuous over substantially the entire region in the longitudinal direction. It has become. Accordingly, the side reinforcing portions 11 can be provided by bending the left and right side surfaces over substantially the entire region. By providing the side reinforcement portion 11 on the support arm 3, the rigidity of the support arm 3 can be greatly increased, and the resonance frequency of the support arm 3 can be greatly increased from about 2 kHz to about 10 kHz. it can.

  Therefore, the rotational speed of the head support arm 10 can be made very fast, and the access speed can be increased.

  The second base arm 8 has a hole for fastening the first base arm 6 at one end, and the first base arm 6 having the slider 1 is coupled by a known method such as caulking. ing. As will be described later with reference to a disk device, driving means such as a voice coil motor is formed on the opposite side of the first base arm 6 across the bearing portion. Alternatively, the second base arm 8 may be linearly moved in the diameter direction of the disk on which the recording medium is formed.

  A head support device 12 is composed of the head support arm 10 and the second base arm 8, and various lengths of the arm portion of either the first base arm 6 or the second base arm 8 can be changed. This can correspond to the size of the recording medium. Therefore, a practical configuration can be provided for standardization when a magnetic recording / reproducing apparatus having recording media of different sizes and types is produced.

The urging force by which the slider 1 presses the surface of the recording medium includes the material and thickness of the leaf spring portion 5, the height of the apex of the pivot 7, the connecting portion between the support arm 3 and the leaf spring portion 5, or the first base arm. 6 can be arbitrarily set according to the position of the fixed portion. Further, if there is a manufacturing variation in the positional relationship or the apex height of the pivot 7, the urging force changes. Therefore, in the state where the disk on which the recording medium of the disk device is formed rotates, the head flying amount from the disk on which the recording medium is formed varies from device to device. That is, the urging force F that the slider 1 presses the surface of the recording medium depends on the spring constant K of the leaf spring portion 5 of the head support device 12 and the displacement x of the slider 1.
F = Kx (1)
However, because both the spring constant K and the displacement amount x change due to the height variation of the vertex of the pivot 7, the variation becomes large.

  4A is a plan view of the support arm 3 of the head support device 12. The leaf spring portion 5 is joined by the first base arm 6 and the fixing portion 13, and is connected to the support arm 3 by the connection portion 14. FIG. ing. FIG. 4B is a side view in which the support arm 3 of the head support device 12 is modeled in order to obtain a force balance.

In FIG. 4, when the pivot 7 is pushed down to give δ displacement to the support arm 3, the load load f ₀ of the slider 1, the internal pressure f _{P of the} pivot 7, and the connection portion between the leaf spring portion 5 and the support arm 3. The balance is obtained by using the moment M ₁ acting on 14. Here, the distance from the center of gravity of the slider 1 to the pivot 7 is L ₀ , the distance from the pivot 7 to the connecting portion 14 is L ₂ , the distance from the fixed portion 13 to the connecting portion 14 is L _1, and m is L ₂ . The ratio with L ₁ was L ₂ / L ₁ .

L ₂ = mL ₁ (2)
When the spring constant K is obtained from the balance condition when an external force of f ₀ is applied to the slider 1, the spring constant K is expressed by the following equation.

K = [EI / (L ₀ ² × L ₁ )] × (3 m ² -3m + 1) (3)
Here, E is the Young's modulus of the support arm 3, and I is the moment of inertia of the cross section of the support arm 3. That is, the spring constant K is a quadratic function of m.

FIG. 5 is a characteristic diagram showing the relationship between m and the spring constant K when the shape of the leaf spring portion 5 is symmetrical with respect to the longitudinal center line 4 of the support arm 3 as shown in FIG. It is. As can be seen from FIG. 5, the spring constant K shows a minimum value at a predetermined m. 5 that in the case of symmetrical leaf springs, m is 0.5, i.e. it is possible to the spring constant K minimized by providing a pivot located half the L _1.

  FIG. 6 is a side view showing a model of the state of the support arm 3 with respect to each value of m. As shown in FIG. 6, when m <0.5, if the pivot 7 is pressed downward to give a displacement δ, the slider 1 faces upward, and when m = 0.5, it is supported by the pressing distance. The arm 3 moves in parallel downward, and when m> 0.5, the slider 1 tilts downward.

Therefore, in order to apply a biasing force that biases the slider 1 toward the recording medium so that the slider 1 presses the surface of the recording medium (not shown), m where the spring constant K exceeds the minimum value is 0. It can be seen that it is practically usable when the value is .5 or more . The upper limit of m is preferably 0.8 or less so that the spring constant K does not become excessive. The value of m indicating the minimum value of the spring constant K varies depending on the shape of the spring, which is an elastic member, and the optimum spring constant K is selected according to the shape in which the stress generated in the spring is optimized. It is possible to determine the position of the pivot 7 as a part.

  The center P of the head support member including the slider 1, the flexure 2, the support arm 3 and the balancer 22 is on the line connecting the vertices of the two pivots 7 of the support arm 3 and the first base arm 6. If it is designed to be substantially the same position as (not shown), it is possible to realize the head support arm 10 constituting the stable head support device 12 with less vibration against external impacts and the like. it can. The head support arm 10 having the greatest impact resistance can be realized when the center of gravity of the head support arm 10 coincides with the midpoint P described above. However, as long as it is on the line connecting the vertices of the two pivots 7 of the first base arm 6, it is possible to realize the head support arm 10 having practically sufficient impact resistance even if it deviates from the midpoint P. it can.

(Embodiment 2)
FIG. 7 shows a cross-sectional view of the head driving apparatus according to the second embodiment of the present invention. As shown in FIG. 7, the first base arm 6 having the same basic configuration as that described in the first embodiment is formed on the upper and lower magnetic recording media 15 on both surfaces of one second base arm 8. And a head support device 12 including a head support arm 10 and the like. The second base arm 8 is pivotally supported by the bearing 16 and is driven in the radial direction of the magnetic recording medium 15 by a driving means (not shown) such as a voice coil motor provided on the opposite side across the bearing 16. It is set as the structure which can be rotated. Here, the distal end portion 17 of the first base arm 6 provided with the fixing portion 13 of the leaf spring portion 5 is inclined with respect to the parallel surface of the support arm 3 by a predetermined angle θ.

  The inclination angle θ is designed so as to apply a pressing force, that is, an urging force, to the slider 1 so that the slider 1 obtains a predetermined flying height in a state where the magnetic recording medium 15 rotates and the flying force of the slider 1 is generated. It is possible.

  As described above, when the position of the pivot 7 is set so that the spring constant K shows the minimum value, the support arm 3 moves in parallel. At this time, the pressing force of the slider 1 becomes zero, and in order to obtain the pressing force, it is necessary to rotate the support arm 3 from the parallel state to the center of the line segment connecting the two pivots 7.

  Therefore, as shown in FIG. 7, the distal end portion 17 of the first base arm 6 provided with the fixing portion 13 or the entire first base arm 6 is inclined with respect to the support arm 3 by a predetermined angle θ, By connecting to the leaf spring portion 5, a predetermined pressing force can be secured for the magnetic recording medium 15, and the head supporting device 12 having a constant pressing force without being affected by the height variation of the pivot 7 and the like. The head driving device used can be realized.

  In the present embodiment, the first base arm 6 is inclined, but the same effect can be obtained by inclining the slider 1 side from the position of the second base arm 8 or the pivot 7 of the support arm 3. Can be obtained. Further, the same effect can be obtained by bending the leaf spring portion 5 instead of bending the distal end portion 17.

(Embodiment 3)
FIG. 8 is a perspective view of the disk device according to the third embodiment of the present invention, and shows a disk device using the head support device 12 according to the first and second embodiments. In FIG. 8, the same components as those in FIGS. 1 to 7 are denoted by the same reference numerals.

  In FIG. 8, the head support device 12 includes a support arm 3, a first base arm 6, a second base arm 8, a bearing portion 16, and the like, and is pivotally supported around a rotation center 18 of the bearing portion 16. Has been. A drive unit 19 such as a voice coil motor is provided on the opposite side of the bearing unit 16 of the head support device 12 and the first base arm 6 across the bearing unit 16, and supplies a control current to the drive unit 19. By driving the magnetic head, the magnetic head (not shown) mounted on the slider 1 of the head support device 12 can be positioned at a predetermined track position of the magnetic recording medium 15. As the drive means 19, for example, a voice coil motor or a linear motor can be used.

  On the other hand, the magnetic recording medium 15 can be rotated at a predetermined rotational speed by the rotation driving means 20. As this rotation drive means 20, a spindle motor can be used, for example. The casing 21 holds these in a predetermined positional relationship and is sealed with a lid (not shown) to prevent the recording medium and the head from being deteriorated by external corrosive gas or dust.

  As described above, according to the present embodiment, the center point P (not shown) of the center of gravity of the head support member on the line connecting the vertices of the two pivots 7 of the support arm 3 and the first base arm 6 is shown. Therefore, a stable head support device and a disk device using the same can be realized with less vibration against external impacts and the like. Therefore, it is possible to prevent the slider from colliding with the surface of the recording medium and damaging the magnetic head and recording medium mounted on the slider.

  In the above embodiment, the pivot support portion is described as a pivot shape that contacts at the apex. However, the rotation support portion may be contacted by a line, for example, a wedge shape or a semi-cylindrical shape. .

  Further, it is possible to increase the overall rigidity including the support arm while increasing the pressing force applied to the slider. Furthermore, since these can be set independently as the actions of the respective components, the design of the head support arm is easy and the degree of design freedom can be increased.

  In addition, by providing side reinforcing portions on both side surfaces of the support arm, or by making the leaf spring portion a separate member using a flexible material and forming the support arm with a highly rigid material, Since the resonance frequency can be increased, the vibration mode that has been a problem in the past does not occur. Accordingly, no settling operation is required and positioning can be performed by rotating the support arm at a high speed, and the access speed of the magnetic recording / reproducing apparatus can be improved.

  Furthermore, as a head support device, it is possible to obtain a constant slider pressing force without being affected by manufacturing variations such as part processing accuracy or assembly accuracy, so a stable disk device is supplied. It becomes possible to do.

  In the embodiment of the present invention, the head support device of the magnetic recording / reproducing apparatus using the magnetic head has been described. However, the head support device of the present invention is a non-contact type disk device such as an optical disk device or a magneto-optical device. The same effect can be obtained when used as a head support device such as a disk device.

  The present invention can be applied to a disk device that records and reproduces data on a disk using a head having a large recording capacity and a small size.

The perspective view which shows the structure of the principal part of the head support apparatus in Embodiment 1 of this invention. Side view of the main part of the head support device The exploded perspective view of the principal part of the head support device (A) is a plan view of a support arm of the head support device, and (b) is a side view that models the support arm of the head support device in order to obtain a balance of forces of the head support device. The characteristic view which showed the relationship between m and the spring constant K by the model of FIG. 4 in Embodiment 1 of this invention Side view of the support arm modeled for each value of m Sectional drawing of the head drive device in Embodiment 2 of this invention The perspective view of the disc apparatus in Embodiment 3 of this invention Plan view showing the configuration of a conventional magnetic recording / reproducing apparatus Schematic perspective view showing the configuration of a conventional L / UL magnetic recording / reproducing apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Slider 2 Flexure 3 Support arm 3a Dimple 4 Center line 5 Leaf spring part 6 1st base arm 7 Pivot 8 2nd base arm 9 Joint part 10 Head support arm 11 Side reinforcement part 12 Head support apparatus 13 Fixed part 14 Connection Part 15 Magnetic recording medium 16 Bearing part 17 Tip part 18 Rotation center 19 Drive means 20 Rotation drive means 21 Housing 22 Balancer

Claims (4)

A head that performs at least one of recording and reproduction with respect to a disk;
A head support member composed of the head, a head attachment portion to which the head is attached, and a support arm to which the head attachment portion is attached to one end;
A base arm provided with a rotation support portion that supports the head support member to be rotatable in a direction perpendicular to the disk surface;
One end is connected to the other end of the support arm, the other end is connected to the base arm, and an elastic member for applying a biasing force to bias the head support member in the disk direction is provided. Prepared,
The position of the center of gravity of the head support member is disposed on the rotation axis of the rotation support portion provided on the base arm,
The base arm is inclined at a predetermined angle such that the support arm applies a biasing force to the disk surface,
While providing the rotation support part at a position where the head mounting part is displaced in the pressing direction of the rotation support part against the pressing of the rotation support part of the base arm,
The elastic member is a leaf spring, and the elastic member has a length L ₁ from a connection portion connected to the support arm to a fixed portion fixed to the base arm, and the rotation support portion to the connection portion. Ri Oh ratio L _{2 /} L ₁ is 0.5 and the length L ₂ of the up and to the longitudinal center line of the support arm provided between said supporting arm and said base arm A head support device, characterized in that it is a symmetrical leaf spring member . The head support device according to claim 1, wherein the support arm is displaced substantially parallel to the pressing of the rotation support portion of the base arm. A head support device;
A bearing that rotatably supports the head support device in a direction parallel to the disk surface;
Driving means for rotating the head support device in a direction parallel to the disk surface;
A head driving device comprising the head supporting device according to claim 1 . A disc,
Rotational drive means for driving the disk;
A head driving device for writing to or reading from a predetermined track position of the disk,
A disk drive comprising the head drive device according to claim 3 .

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