JP4241666B2 - Head actuator and disk device using the same - Google Patents

Description

  The present invention relates to a head actuator for a disk device that can be applied to a mass storage device for an information processing apparatus and the like, and a disk device using the same. Specifically, as a head actuator for writing and reading data using a disk such as a magnetic disk or an optical disk, a suspension with a flying slider attached is a bent suspension, and a second drive is provided near the bent portion. The present invention relates to a head actuator in which the followability of a magnetic head attached to a flying slider is improved by providing a portion and using this as tracking control or the like, and a disk device using the head actuator.

  A hard disk drive (HDD) is known as a large-capacity storage device using a magnetic disk or an optical disk as a medium for writing and reading data. Among these hard disk devices, a removable hard disk device in which a disk is configured to be detachable is known.

  In the removable hard disk device, as shown in FIG. 10, a head actuator 1 and a spindle motor 21 are arranged in the device main body 20, and a chucking magnet 22 is attached to the spindle motor 21.

  The head actuator 1 is pivotally supported by the apparatus main body 20 so as to be rotatable in an arrow K direction around a fulcrum (pivot) 5. A bent type head actuator as shown in the drawing is used as the head actuator 1, which can reduce a window hole (hole into which the head is inserted) formed in the disk cartridge and the accessibility of the head, as will be described later. This is aimed at improving the above.

FIG. 11 is a configuration diagram of the bent type head actuator 1.
The bent type head actuator 1 bent in an L-shape has a rotating arm 6 that rotates about a pivot 5, and the suspension 2 (2a, 2a, 2b), and a flying slider (flying head slider) 12 (12a, 12b) is attached to the tip of the suspension 2. As is well known, a magnetic head (not shown) is attached to the flying slider 12 to perform data recording / reproduction processing. As is well known, the suspension 2 acts as a spring that presses the flying slider 12 against the disk. The suspension 2 is provided with a dimple 23 that slides in contact with the ramp during dynamic loading / unloading.

  The other end of the rotating arm 6 is provided with a driving unit (first driving unit) 4 for rotating the rotating arm 6. As shown in the figure, the drive unit 4 has a drive coil 3 attached to a rotating arm 6, a drive magnet 8 attached to a lower yoke 10 is disposed on the lower surface side thereof, and an upper yoke 9 is disposed on the upper surface thereof. Are arranged to constitute a magnetic circuit as a whole.

  When a current is passed through the drive coil 3, the rotating arm 6 is rotated clockwise or counterclockwise (arrow J) by the electromagnetic force. Therefore, the drive unit 4 functions as a voice coil motor (VCM).

  In FIG. 10, when the head actuator 1 rotates to the disk side, the dimple 23 descends (unloads) on a slide-like slope provided on the dynamic load / unload ramp 15 fixed to the drive. Both the unloading and the reverse rise (loading) are performed on the outermost peripheral side of the disk (not shown).

  FIG. 12 shows an outline of a disk cartridge 19 used by being mounted on the removable hard disk device 20. The disk cartridge 19 is formed by bonding a resin upper half 28 and a lower half 29 by welding or the like. The upper half 28 and the lower half 29 are provided with an insertion hole 24 for taking the head actuator 1 in and out, and the lower half 29 is provided with a hole 25 for a hub. In order to prevent dust from entering through the insertion hole 24 and the hub hole 25, the shutter 26 slides to block both when the cartridge is not in use.

  A recording / reproducing magnetic disk 18 is accommodated in the disk cartridge 19, and a chucking hub 27 made of a ferromagnetic material is fixed to the center of the disk 18 by bonding or the like. When the disk cartridge 19 is mounted on the removable hard disk device 20, the hub 27 is chucked (adsorbed) to the chucking magnet 22 of the spindle motor 21.

  Thereafter, when the spindle motor 21 rotates and reaches a constant angular velocity, the flying slider 12 is gently loaded onto the disk 18. When loaded, the flying slider 12 floats from the surface of the disk 18 by several tens of millimeters due to an aerodynamic effect.

  By the way, the head actuator as described above is excellent in I-θ characteristic (frequency characteristic in the seek direction) because it is less affected by the torsional mode of the suspension 2 than an inline actuator that is a general rotary actuator. Presents.

  However, since the magnetic head and the drive coil 3 are arranged very far apart, the structural resonance of each structure may be picked up before the driving force is transmitted from the drive coil 3 to the flying slider 12. There is a problem that it is difficult to position the magnetic head with high precision. That is, there is room for improvement in the followability of the flying slider 12.

  Further, in the bending type actuator that is a rotation type actuator, the drive coil 3 constituting the drive unit 4 generates a translational force in the layout, and therefore the translational force generated by the drive coil 3 is the translational force of the pivot 5. There is also a problem that causes the mode. This is because the same force as the electromagnetic force generated by energization of the drive coil 3 acts on the pivot 5 as a counteraction, and a translational mode is generated by a resonance action that becomes an excitation source.

  Therefore, the present invention proposes a head actuator that can improve at least the followability of the flying slider and a disk device using the head actuator.

In order to solve the above-described problem, a head actuator according to the present invention includes a pivot arm that pivots about a pivot, and a flying slider that has a magnetic head provided via a suspension at the tip of the pivot arm ; A driving force generated by the first driving unit, which includes a first driving unit that rotates the rotating arm provided on the pivot side of the rotating arm and a second driving unit that is attached in the vicinity of the flying slider. the vector of the, and the driving force of vector second generated by the drive unit, on a surface substantially coplanar pivot arm is pivoted, the first and second in so that given a driving force in the opposite direction to each other driver of Ru is located.

In order to solve the above-described problem, a disk device according to the present invention includes a pivot arm that pivots about a pivot, and a flying slider that has a magnetic head provided at a tip portion of the pivot arm via a suspension, A driving force generated by the first driving unit, which includes a first driving unit that rotates the rotating arm provided on the pivot side of the rotating arm and a second driving unit that is attached in the vicinity of the flying slider. the vector of the, and the driving force of vector second generated by the drive unit, on a surface substantially coplanar pivot arm is pivoted, the first and second in so that given a driving force in the opposite direction to each other driver of Ru is located.

  In the present invention, a second drive unit, which may be called a second VCM, is disposed in the vicinity of the attachment base of the bent suspension, and fine control such as tracking is performed by the second drive unit. In this case, since the second driving unit is in the vicinity of the flying slider, the followability is extremely good. Therefore, precise head position control is possible.

  By giving the second drive unit a turning force that cancels the reaction force of the electromagnetic force acting on the pivot from the first drive unit, the translation mode at the pivot can be eliminated.

  Therefore, the fixed or removable disk device provided with the present invention can realize a disk device with good followability to access.

  According to the head actuator of the present invention, since the second driving unit is arranged in the vicinity of the magnetic head, it is difficult to pick up structural resonance until the driving force from the second driving unit reaches the magnetic head. Thus, the effect of facilitating the super-precision positioning operation of the magnetic head can be obtained.

  In addition, a reverse driving force can be applied to the first and second driving units, and a driving force vector generated in the first driving unit and a driving force vector generated in the second driving unit are By arranging the first and second drive units so that they are on the same plane parallel to the surface on which the rotating arm rotates, it is possible to prevent the occurrence of moments that cause the rotating arm to fall. It is possible to prevent the occurrence of a shaft tilt mode, which is a harmful resonance, and to cancel the translational force generated by these two drive units, and to prevent the occurrence of a translation mode related to the pivot, which is a resonance having a large peak. The effect is obtained.

  Therefore, when a fixed or removable disk device is configured using such a head actuator, a disk device with good followability can be realized.

  Hereinafter, a case where a head actuator according to an embodiment of the present invention and a disk device using the head actuator are applied to a removable disk device will be described in detail with reference to the drawings.

  The examples described below are preferred specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is described in the following description to particularly limit the present invention. As long as there is no, it is not restricted to these aspects.

  Also in the present invention, the head actuator is a bent type actuator that is bent substantially in an L shape. Therefore, as shown in FIG. 1, the head actuator 1 according to the present invention also has a pivot arm 6 that pivots about a pivot 5, and a pair of both sides of the pivot arm is sandwiched between the distal ends of the pivot arm 6. Suspension 2 (2a, 2b) is attached. A floating slider 12 (12a, 12b) is provided at the tip of the suspension 2. The suspension 2 is a bent type that is bent substantially in an L shape as shown in the figure.

  A drive unit (first drive unit) 4 is provided at the other end of the rotating arm 6. Similarly to the conventional example, the drive unit 4 includes a drive coil 3, a magnet 8, and a pair of yokes 9 and 10 constituting a magnetic circuit.

  In the present invention, the second drive unit 13 is provided near the base of the bent suspension 2. The second drive unit 13 sandwiches the movable magnet 14 as shown in FIG. 2 with a magnet (movable magnet) 14 attached to the base of the suspension 2, in this example, the side surface of the distal end of the rotating arm 6. The upper and lower fixed coils 11a and 11b are arranged on the upper and lower surfaces at a predetermined distance. The planar shape of the fixed coils 11a and 11b is curved into a shape along the turning locus of the turning arm 6, as shown in FIG.

A driving current (control current) can flow in any direction with respect to the fixed coils 11a and 11b. Since the magnetic flux from the movable magnet 14 becomes an arrow C as shown in FIG. 2, for example, if the same amount of current flows in the directions of arrows A and B, the magnetic flux of the movable magnet 14 and the current flowing through the fixed coils 11a and 11b Therefore, an electromagnetic force acts on the suspension 2. here,
Magnetic flux penetrating the lower surface of the coil 11a >> Because it is magnetic flux penetrating the other surface of the coil 11a, the current flowing through the lower surface of the fixed coil 11a becomes dominant, and in the direction toward the back with respect to the paper surface according to Fleming's left-hand rule. The movable magnet 14 generates an electromagnetic force (driving force). Similarly, the driving force is generated in the direction in which the movable magnet 14 advances deeply with respect to the paper surface also by the other fixed coil 11b. The head actuator 1 is driven to the disk 18 side by the combined driving force (synthetic force). The driving force is larger on the first driving unit 4 side than on the second driving unit 13 side.

  Therefore, the seek operation is performed by a control signal supplied to the first drive unit 4, and final fine adjustment (tracking adjustment) is performed by a control signal (tracking control signal) applied to the second drive unit 13. As described above, since the second drive unit 13 is disposed in the vicinity of the flying slider 12 at the tip of the suspension 2, the driving force described above can be directly transmitted to the flying slider 12. Thereby, the followability of the flying slider 12 can be greatly improved.

  Incidentally, FIG. 3 (a) shows the force (shown by an arrow) applied to the pivot 5 of the head actuator 1 when only the second drive unit 13 is used at the time of precise positioning or the like. Since only the translational force F2 is generated from the second drive unit 13, the pivot 5 receives the reaction force -F2 against the translational force F2. This reaction force -F2 causes a harmful translational rigid body mode with a large peak.

  Therefore, even during precise positioning, the first driving unit 4 generates a driving force F1 having a phase opposite to that of the second driving unit 13 as shown in FIG. If the first drive unit 4 is driven, the reaction force is canceled to a practically satisfactory level.

  However, by driving the first drive unit 4, there is a possibility that resonance of another structure is transmitted to the flying slider 12 this time. Therefore, in practice, the force F1 is preferably set to a magnitude that suppresses the translational rigid body mode to some extent and does not require other structural resonances to be noticeable.

  FIG. 4A is a view of the main part of the head actuator 1 shown in FIG. 1 as viewed from the side, and the drive coil 3 and the second drive part 13 in the first drive part 4 as shown in FIG. By arranging the magnet 14 and the center of gravity CG of the head actuator 1 on the same plane orthogonal to the axis of the pivot 5 (shown by a thin line), it is possible to prevent the moment from tilting the pivot 5. . As a result, it is possible to prevent the occurrence of a shaft collapse mode which is a harmful resonance.

  However, in practice, the head actuator 1 may be configured as shown in FIG. 4B or FIG.

  In the case of FIG.4 (b), it has the structure which gave the level | step difference to the suspension 2 side among the rotation arms 6, In this case, if the moment which generate | occur | produces with the drive force of fixed coil 11a, 11b can be canceled, The axis collapse mode does not occur.

Specifically, the driving force of the fixed coil 11a is F2a, the driving force of the fixed coil 11b is F2b, a plane orthogonal to the axis of the pivot 5 and passing through the center of gravity CG (thin line illustration) and upper and lower end surfaces of the magnet 14 (suspension 2a, When the distances up to 2b) are L2a and L2b, respectively,
F2a × L2a + F2b × L2b = 0
By controlling to output Fa and Fb so that

  As shown in FIG. 4C, when the drive coil 3 is positioned below the center of gravity CG, the shaft collapse mode can be achieved by offsetting the moment generated by the drive force of the drive coil 3 and the fixed coils 11a and 11b. Does not occur.

For that purpose, if the driving force of the driving coil 3 is F1, orthogonal to the axis of the pivot 5, and the distance from the plane passing through the center of gravity CG (thin line shown) to the center of the driving coil 3 is L1,
F1 × L1 + F2a × L2a + F2b × L2b = 0
Control may be performed so that the forces F, Fa, and Fb are obtained.

  Incidentally, in the configuration shown in FIG. 1, the magnet 14 is always present in the vicinity of the bending point of the suspension 2 because the second driving unit 13 is disposed in the vicinity of the suspension 2.

  Therefore, depending on the design, the magnetic flux generated by the magnet 14 may pass through the inside of the suspension 2 and pass through the magnetic head attached to the tip portion thereof. This is because an MR head (Magneto Resistive Head) is often used as the magnetic head, and when this MR head is used, it is easily affected by an external magnetic field. The reason for being easily affected by the external magnetic field is that ferromagnetic stainless steel is used as the suspension 2. Incidentally, although the material of the suspension 2 is a non-magnetic material, it is often changed to a ferromagnetic material through a process such as rolling.

  In a magnetic disk device, an MR head is often used as a read head. However, since the MR head is weak against an external magnetic field, there is a possibility that a failure may occur due to the magnetic flux. Therefore, although it depends on conditions, it is desirable to use a non-magnetic material as the material of the suspension 2.

  FIG. 5 is a perspective view of an essential part showing another embodiment according to the present invention. The basic structure of the head actuator 1 is the same as that shown in FIG. 1, but in this embodiment, a movable coil type is used as the second drive unit 13 provided in the vicinity of the bending point of the suspension 2 bent as shown. used. Incidentally, the example of FIG. 1 has a movable magnet type configuration.

  Therefore, the second drive unit 13 includes a movable coil 31 attached to the side surface of the suspension 2 and a pair of magnets 30 a and 30 b provided above and below the movable coil 31 so as to sandwich the movable coil 31. Since the movable coil 31 moves within the range of the rotation angle of the suspension 2, the magnets 30a and 30b have an arc shape as shown in FIG. An eggplant magnet is used. The magnets 30a and 30b are fixedly attached to the extended ends 9a and 10a obtained by extending the upper and lower halves 9 and 10 in the same shape as the suspension 2, respectively.

  When a current in the direction of arrow D flows through the movable coil 31 as shown in FIG. 6, the movable coil 31 is driven in the direction toward the back with respect to the paper surface by the magnetic flux E of the magnets 30 a and 30 b according to Fleming's left-hand rule. Power is generated. With this driving force, the head actuator 1 slides in the direction of the disk 16.

  Since the fixed magnets 30a and 30b exist in the vicinity of the suspension 2, if the suspension 2 is a magnetic body, it may be attracted to the fixed magnets 30a and 30b and a predetermined ability may not be exhibited. Therefore, it is desirable to use a nonmagnetic material for the suspension 2.

  FIG. 7 shows an outline when the head actuator according to the present invention is applied to a removable disk device. For convenience of explanation, this figure shows the state in which the fixed coil 11a is removed.

  FIG. 7A is a view when the flying slider 12 is located on the innermost circumference of the disk 18, and FIG. 7B is a view when the flying slider 12 is located on the outermost circumference of the disk 18. FIG. FIG. 3C shows a standby state before the flying slider 12 is inserted into the cartridge 19, which is the same as the state immediately after the floating slider 12 is attached to the apparatus main body 20.

  As shown in FIG. 5C, a dynamic unload / load system in which the ramp 15 is held by two shafts 16 is employed. The lamp 15 is always pulled to the arrow H side by the spring 17. When the magnetic head is moved minutely in the disk 18, this second driving force is used.

  When the head actuator 1 moves to the standby position shown in FIG. 3C due to the provision of the spring 17, the second driving force needs to overcome the spring force of the spring 17. When the head actuator 1 is in the standby position, the movable magnet 14 is attracted by the iron piece 40 provided on the apparatus main body 20 side, so that the head actuator 1 is locked in the standby position.

  As is apparent from the configuration of FIG. 7, the movable magnet 14 is always positioned outside the cartridge 19 regardless of the position of the head actuator 1.

  In the configuration shown in FIG. 7, since it is necessary to move the head actuator 1 to the standby position while operating the ramp 15 only with the second driving force, the driving force is simply larger than the driving force for tracking.

  Accordingly, the fixed coil 11 can be driven separately in the two ranges of the range from the standby position to the outermost position of the disk and the seek range and tracking range within the disk. It is also conceivable to bisect 11a, 11b). And the seek and tracking coils in the disk are for low power consumption and low output, and the coil to bring from the standby position to the disk is for high power consumption and high output, so that the overall driving force is Efficiency can be increased.

  Accordingly, the high acceleration operation is performed mainly by the driving force generated by the first driving unit 4, and the precise operation is performed mainly by the driving force generated by the second driving unit 13. More specifically, when high acceleration operation is required, the driving force generated by the second driving unit 13 is controlled to be smaller than the driving force generated by the first driving unit 4. On the contrary, when the magnetic head needs to be precisely positioned, the driving force generated by the second driving unit 13 is substantially equal to or higher than the driving force generated by the first driving unit 4. Is also controlled to be larger.

  FIG. 8 shows an embodiment in which the head actuator 1 shown in FIG. 5 is applied to a removable disk device. FIG. 8A shows the flying slider 12 positioned at the innermost periphery of the disk 18. FIG. 4B is a view when the flying slider 12 is located on the outermost periphery of the disk 18.

  The figure shows a case where a CSS (Contact Start and Stop) system is adopted as in a normal hard disk device. As shown in the figure, the second drive unit 13 is always located outside the disk 18 regardless of the position of the head actuator 1.

  In the present invention, a head actuator 1 having a bent configuration is used, and the second drive unit 13 is applied thereto. It is also conceivable to apply the second drive unit, which is the main part of the present invention, to a so-called in-line head actuator that has been conventionally known.

  However, when applied to an inline type head actuator, the movable coil 14 or the movable magnet 31 constituting the second drive unit 13 is always located outside the disk cartridge 19 as shown in FIG. 14 and the like must be arranged considerably on the base side of the rotating arm 6. Further, since the suspension 2 is also arranged in-line, resonance tends to occur in the seek direction.

  For this reason, it is extremely difficult to directly transmit the second driving force to the flying slider 12 and the magnetic head. That is, the merit of providing the second drive unit 13 in the head actuator 1 is almost lost. Most preferably, it is applied to the bending type head actuator 1.

  In the embodiment of FIG. 6 described above, for example, a through hole is provided between a pair of suspensions 2a and 2b corresponding to the central portion of the drive coil 31, and an arcuate yoke for forming a magnetic circuit is passed through this through hole. It can also be configured. By doing so, the magnetic flux can be efficiently converged on the drive coil 31 side, so that the drive efficiency is improved.

  This modification is particularly suitable for application to a so-called multi-plater type head actuator provided with two or more magnetic heads. This is because a plurality of suspensions are provided, so that the thickness of the suspension itself is thick. Therefore, if a magnetic circuit yoke is provided through almost the center of the suspension, the magnetic flux can be efficiently converged to the drive coil side. Because it will be possible.

  The disk device according to the present invention can be applied not only to a removable disk device using a disk cartridge, but also to a fixed disk device using a fixed disk having a cylinder structure in which one or a plurality of disks are stacked. Is clear. The configuration is the same as that of a removable disk device except that the disk to be used is fixed from the cartridge type and that the disk to be used is not limited to one. Therefore, the description using the drawings and the detailed description of the configuration and operation are omitted. The disc can be used in either a double-sided type that can use both sides or a single-sided type that uses only one side. Of course, the above-described head actuator is used.

  The present invention is applied to a disk device head actuator that can be applied to a mass storage device for an information processing device and the like, and a disk device using the head actuator.

It is a block diagram of the head actuator which shows the 1st embodiment of this invention. It is a block diagram of the principal part which shows the specific example of the 2nd drive part used for this. It is a figure which shows the relationship between the 1st and 2nd driving force. FIG. 4 is a side view of FIG. 3. It is a block diagram of the head actuator which shows the 2nd embodiment of this invention. It is a block diagram of the principal part which shows the specific example of the 2nd drive part used for this. 1 is a configuration diagram of a disk device showing a first embodiment of the present invention. FIG. It is a block diagram of the disc apparatus which shows the 2nd embodiment of this invention. It is a block diagram of the disc apparatus which shows an example when the 2nd drive part is mounted in an in-line type actuator. It is a block diagram of the disk apparatus which employ | adopted the bending type actuator. It is the block diagram which showed the structure of the bending type actuator. 2 is a configuration diagram showing a configuration of a disk cartridge. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Head actuator, 2 ... Suspension, 3 ... Drive coil, 4 ... 1st drive part (VCM), 6 ... Turning arm, 11 ... Fixed coil, 12. ..Floating slider, 13 ... second drive unit (VCM), 14 ... magnet, 18 ... disk, 19 ... cartridge, 31 ... moving coil

Claims (4)

A pivot arm that pivots about a pivot;
A flying slider having a magnetic head provided via a suspension at the tip of the rotating arm ;
A first drive unit that pivots the pivot arm provided on the pivot side of the pivot arm;
And a second driving unit mounted in the vicinity of the flying slider,
The vector of the driving force generated by the first driving unit and the vector of the driving force generated by the second driving unit are opposite to each other on the substantially same plane as the surface on which the rotating arm rotates. It said first and second head actuator drive unit Ru is arranged so that applies a driving force. The times the center of gravity of the rotating arm is, the rotation head actuator arm arranged to be on the surface and Hobodo leveling surface to rotate is been請 Motomeko 1 wherein. The times at the tip of the moving arm has a bent-type suspension, the second drive unit is a head actuator 請 Motomeko 1 wherein that provided in the vicinity of the bent-shaped suspension. A pivot arm that pivots about a pivot;
A flying slider having a magnetic head provided via a suspension at the tip of the rotating arm ;
A first drive unit that pivots the pivot arm provided on the pivot side of the pivot arm;
And a second driving unit mounted in the vicinity of the flying slider,
The vector of the driving force generated by the first driving unit and the vector of the driving force generated by the second driving unit are opposite to each other on the substantially same plane as the surface on which the rotating arm rotates. driving force Lud disk apparatus having a head actuator in which the first and second drive unit Ru is arranged so that given.

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