JP3395785B2 - Head support device and disk device using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head support device using a floating head such as a magnetic head, an optical head, or a magneto-optical head and a disk device using the head support device, and more particularly to a load / unload system (Load / Unload). method:
The present invention relates to a head support device having a head support mechanism (hereinafter abbreviated as L / UL system) and a disk device using the same.

[0002]

2. Description of the Related Art Recently, portable electronic devices (PDA: Par)
sonal Digital Assistance,
Due to the rapid expansion of the market (mobile phones, etc.) and the downsizing of devices, the magnetic disk device, which is one of the leading data storage methods, has higher portability, that is, downsizing, thinning, and High impact resistance has been required.

In order to satisfy this high impact resistance, various methods have conventionally been proposed for the head support mechanism of the magnetic disk device.

For example, the L / UL shown as an example in FIG.
The method called a method was one of the methods of providing a magnetic disk device in consideration of impact resistance.

In the magnetic disk device 29 equipped with the head supporting device having the L / UL type head supporting mechanism shown in FIG. 7, first, when the magnetic recording medium 12 is rotated by the spindle motor 5, the magnetic head ( A slider 1 (not shown) is supported by a support arm 2 and is levitated to a predetermined position on the magnetic recording medium 12 for recording or reproduction (load state).

Next, when the rotation of the magnetic recording medium 12 is stopped, the support arm 2 moves around the rotation shaft portion 3c.
A voice coil motor (Voice) utilizing interaction between a coil 16 provided on the support arm 2 and a magnet 20 and a yoke (not shown) formed above and below the coil 16.
Coil Motor (hereinafter abbreviated as VCM) 24 rotates toward the outside of the magnetic recording medium 12.

As a result, the guide portion 2a formed at the tip portion of the support arm 2 rides on the ramp portion 18 having the taper portion 18a formed on the outer side of the magnetic recording medium 12, so that the vicinity of the tip portion of the support arm 2 is reached. The slider 1 thus formed is held apart from the magnetic recording medium 12 (unloaded state). In the example of FIG. 7, a lock mechanism 30 that uses an iron piece and a magnet is used to hold the slider 1.

In a magnetic disk device 29 equipped with a head supporting device having such an L / UL type head supporting mechanism, the magnetic head and the magnetic recording medium 12 are separated when the magnetic recording medium 12 is stopped. Since the magnetic head is held, the magnetic head may come into contact with the magnetic recording medium 12 even if there is an impact from the outside to cause mechanical or magnetic damage to the magnetic recording medium 12. It was possible to lower it compared with the method.

Conventionally, in a magnetic disk device equipped with a head supporting device having an L / UL type head supporting mechanism, when a guide part provided at the tip of the supporting arm rides on a taper part provided in a ramp part. The sliding load received accounts for more than half of the torque required for VCM, and this sliding load further increases as the number of heads mounted in a multiple disk configuration increases. for that reason,
Various techniques have been proposed for the purpose of reducing the sliding load. For example, a technique of reducing the coefficient of friction between the guide portion and the tapered portion by incorporating a ball bearing in the surface of the tip of the support arm that is to be in contact with the tapered portion of the guide portion (eg Japanese Patent Laid-Open No. 7-334955).
In order to assist the torque of the VCM rotation in the unloading operation in the process of the slider retracting to the ramp,
The iron piece added to the coil support of the VCM section and the lock magnet magnetically cooperate with each other to assist the evacuation to the lamp.
A technique for reducing the sliding load at the time of loading and for preventing the influence of impact on the device by constructing a mechanism for appropriately guiding and locking the rotary actuator (for example, JP-A-11-96).
No. 699) has been proposed.

[0010]

However, in the magnetic disk device, it is necessary to further reduce the size and the thickness of the magnetic disk device as described above. At that time, the coil provided on the support arm and the coil above and below the support arm are required. In the VCM using the action of the provided yoke and magnet, the number of turns is reduced due to the restriction of the coil thickness, and the flux linkage to the coil is reduced and leaked due to the thinning of the magnetic circuit formed by the magnet and the yoke. It is unavoidable that the VCM torque decreases due to an increase in magnetic flux. Therefore, it is necessary to reduce the load applied to the VCM as much as possible.

However, in the method of incorporating the ball bearing in the guide portion at the tip of the support arm, it is very difficult to incorporate the bearing in the tip portion of the support arm when the entire magnetic disk device is downsized. ,
There was a problem in productivity. In addition, mounting extra parts on the tip of the support arm causes the resonance frequency of the support arm to decrease, and when the support arm is rotated at high speed, various vibration modes occur and the settling However, there is a problem that high speed access becomes difficult because it takes time.

Further, in the method of magnetically cooperating the iron piece and the locking magnet to assist the rotation to the evacuation to the lamp and reduce the sliding load at the time of loading, the locking mechanism is newly constructed. However, there is a problem in that the cost is unavoidable in addition to the fact that the size of the magnetic disk drive is a major constraint for downsizing the entire magnetic disk drive.

In addition, including the above-mentioned example, the support arm of the head actuator section rotates about the rotary shaft section as an axis, and the slider equipped with the head rotates substantially in parallel on the surface of the recording medium, and the shaft and the support arm are In most cases, an elastic means such as a spring is placed between the support arm and the head support member to apply a biasing force to the slider provided with the head to keep the flying height of the slider constant from the recording medium surface. , The support arm is operated in the direction perpendicular to the surface of the recording medium, and VC
A technique for reducing the load applied to M has not been considered so far. Therefore, there remains a problem that there is an inherent limit to reducing the sliding load.

The present invention has been made in order to solve these problems, and has a simple structure, high impact resistance, and high speed L / L access while reducing the load on the VCM as much as possible. An object of the present invention is to provide a head supporting device having a UL type head supporting mechanism and a disk device using the same.

[0015]

In order to solve the above-mentioned problems, specifically, the head supporting device of the present invention has the following structure. That is, the head support device is
The support arm has a head mounted on a slider on a surface of one end of the support arm that should face the recording medium. The support arm has a bearing portion as a rotation center, and a recording medium in a radial direction and a recording medium. The support arm is provided rotatably in a direction perpendicular to the surface, and the support arm is provided with an elastic means for applying a biasing force in the direction of approaching the recording medium. Is sucked into the support arm to reduce the biasing force applied to the support arm. Further, in the head support device of the present invention, a gimbal mechanism that supports the slider in the roll direction and the pitch direction is provided on the support arm, the support arm is made of a highly rigid material, and the elastic means is configured to rotate. A structure that uses the elasticity of a leaf spring provided between the bearing portion and the support arm along the central axis, and the bearing portion is provided with a pivot bearing having a pair of tops so as to contact the support arm. The support arm is rotatably provided in a direction perpendicular to the recording surface of the recording medium with a point at which the top portion of the bearing contacts the support arm as a fulcrum. Direction and the longitudinal direction of the support arm, and a configuration that abuts the support arm on a line that passes through the center of rotation of the recording medium in the radial direction,
The configuration provided at positions symmetrical with respect to the longitudinal centerline of the support arm, the respective top portions of the pivot bearing provided at positions symmetrical with respect to the longitudinal centerline of the support arm, the respective top portions of the pivot bearing are A structure in which the support arm is in contact with a point or a line parallel to the main surface of the support arm and perpendicular to the longitudinal direction, and further, the position of the center of gravity of the portion held by the elastic means causes the support arm to rotate in the radial direction of the recording medium. It also has a structure that overlaps with an intersection of the axis and a rotation axis perpendicular to the recording surface of the recording medium. With these configurations, when an impact is applied from the outside, the support arm portion can be formed of a high-rigidity member and the biasing force of the elastic means on the slider can be set arbitrarily, so that it is extremely resistant. Since the impact resistance is high and the resonance frequency of the support arm can be increased, it is possible to provide a head support device having high response characteristics and capable of high-speed access.

The disk device of the present invention has the following configuration. That is, the disk device of the present invention comprises a recording medium rotatably supported, a support arm,
A head mounted on a slider is provided on a surface of one end of the support arm that should face the recording medium, and the support arm has a bearing portion as a rotation center and is perpendicular to the radial direction of the recording medium and the recording surface. A head support device that is provided so as to be rotatable in the direction, and that has elastic means for applying a biasing force to the support arm in the direction of approaching the recording medium, and a rotation center in the direction parallel to the rotation axis of the recording medium. On the other hand, a pair of yokes facing each other on the opposite side of the slider via a gap, a magnet arranged in the gap of the yoke, and a magnetic gap held by a support arm and formed by the magnet and the yoke are arranged. A coil, a rotating means for rotating the recording medium, a head, a rotating means, and a coil, which are electrically connected to each other, exchange signals with the head, control the rotation of the recording medium, and control the rotation of the support arm. When Holding the head in position,
Evacuation means for retracting the head from the recording medium in a non-contact manner, and when retracting the head, attracting the other end side of the support arm of the head supporting device by the magnetic attraction means at and near the retracted position. Thus, the urging force applied to the support arm is reduced. With this configuration, the support arm can be provided with a portion having a rigid body and a portion having elasticity independently, and when an impact is applied from the outside, the support arm portion can be formed of a high-rigidity member. The urging force of the elastic means on the slider can be set arbitrarily. Therefore, the shock resistance is extremely high and the resonance frequency of the support arm can be increased, so that it is possible to provide a disk device having high response characteristics and capable of high speed access.

Further, in the disk device of the present invention, the magnetic attraction means operates by the interaction between the magnetic member and the magnet integrally held by the coil, and the magnetic member is positioned at a radial position larger than the opposing magnets. It has a configuration arranged in. With this configuration, by sliding the other end of the support arm by the magnetic attraction means, the sliding load between the guide part and the ramp part of the support arm during unloading can be reduced, and the load on the VCM can be minimized. (EN) It is possible to provide a disk device that has a simple structure, high impact resistance, is small in size, is thin, has excellent portability, and can be accessed at high speed while suppressing the influence on the seek operation of VCM while reducing the amount. It will be possible.

Further, the disk device of the present invention has a structure in which the outer diameter portion of the magnet facing the magnetic member is locally enlarged at the retracted position of the head or in the vicinity thereof. With this configuration, in the vicinity of the outer peripheral side of the recording medium,
The amount of magnetic flux linked to the coil will increase, and VCM
It is possible to increase the torque generated.

Further, in the disk device of the present invention, the retracting means is constituted by a ramp portion provided in a predetermined area of the outer peripheral portion or the inner peripheral portion of the recording medium. With this configuration, when the recording medium is stopped, the head on the recording medium can be held on the ramp portion while being separated from the recording medium, and the holding state of the head can be maintained at the time of impact, resulting in extremely high impact resistance. An excellent disk device can be provided.

Further, the disk device of the present invention has a structure in which the ramp portion is formed of a material having a good sliding property and a small friction coefficient. With this configuration, the sliding resistance between the guide portion and the taper portion of the ramp portion decreases when the slider is unloaded, and the VCM is reduced.
The load on the equipment will be reduced.

Further, the disk apparatus of the present invention has a structure in which a gimbal mechanism for freely supporting the slider in the roll direction and the pitch direction is provided on the support arm. With this configuration, during recording / reproducing of the disk device, the gimbal mechanism absorbs an unnecessary inclination of the slider with respect to the recording medium in the roll and pitch directions.

The disk device of the present invention has a structure in which the support arm is made of a highly rigid material. With this configuration, resistance to external impacts is improved, the resonance frequency of the support arm can be increased, and as a result, the access speed of the disk device can be improved.

Further, in the disk device of the present invention, the elastic means uses the elasticity of the leaf spring provided between the bearing portion and the support arm along the axis of the rotation center. With this configuration, the rigid body portion and the elastic portion of the support arm are separated from each other, and the biasing force on the slider can be set arbitrarily. Further, it is possible to easily provide a disk device having a head supporting mechanism that is thin in the direction perpendicular to the recording medium.

Further, in the disk device of the present invention, the bearing portion is provided with a pivot bearing having a pair of tops so as to be in contact with the support arm, and the point where the top of the pivot bearing and the support arm come into contact is a fulcrum. The support arm is provided so as to be rotatable in the direction perpendicular to the recording surface of the recording medium. With this configuration, the center of rotation is regulated, and the center of rotation can be accurately determined with a simple configuration,
The head positioning control can be performed more accurately.

Further, in the disk device of the present invention, the pair of top portions provided on the pivot bearing are perpendicular to the axial direction of the bearing portion and the longitudinal direction of the support arm and on a line passing through the center of rotation of the recording medium in the radial direction. Has a structure provided so as to contact the support arm. With this configuration, it is possible to provide a disk device including a head support mechanism that has a good weight balance in the longitudinal direction of the support arm and is excellent in impact resistance.

Further, the disk device of the present invention has a structure in which the tops of the pivot bearings are provided at positions symmetrical with respect to the longitudinal center line of the support arm. With this configuration,
It is possible to provide a disk device including a head support mechanism that has a good weight balance of the support arm in the width direction and is excellent in impact resistance.

Further, in the disk device according to the present invention, the pair of tops provided on the pivot bearing are in contact with the support arm at a point or a line parallel to the main surface of the support arm and perpendicular to the longitudinal direction. With this configuration, the operation torque of the support arm in the direction perpendicular to the recording medium surface is reduced, and the load on the VCM can be reduced.

Further, the disk device of the present invention comprises at least a bearing portion, a pivot bearing, an elastic means, a support arm, and a coil holder to which a coil is fixed, and a rotation center is provided under the coil holder via an annular collar. The head actuator is formed around the axis. With this configuration, a head actuator that can rotate in the radial direction of the recording medium and in the direction perpendicular to the recording surface can be realized with a relatively simple structure with the bearing portion as the rotation center, and the recording medium when an impact is applied. It is possible to provide a disk device that suppresses damage due to contact or collision of the head slider with the surface, has high response characteristics, and enables high-speed access.

Further, in the disk device of the present invention, the position of the center of gravity of the portion held by the elastic means is such that the support arm rotates in the direction perpendicular to the radial axis of the recording medium and the recording surface of the recording medium. It has a structure that overlaps with the intersection with the axis. With this configuration, unnecessary vibration of the support arm can be suppressed to a minimum when there is an impact from the outside.

Further, the disk device of the present invention has a configuration in which the shape of the magnetic member is a small cylinder, a small ellipsoid, or a small sphere. This configuration has the effect of reducing the sliding load between the guide part of the support arm and the ramp part during unloading, and reduces the load on the VCM. Therefore, a compact and thin disk device is provided with a simple structure. It becomes possible to do.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

(First Embodiment) FIG. 1 shows a first embodiment of the present invention.
3 is a plan view of a disk device having the head support device according to the embodiment of FIG. FIG. 1 shows a state in which the support arm 2 is held by the ramp portion 18, that is, a so-called magnetic head is unloaded. It should be noted that FIG. 1 has a portion in common with FIG. 7 used in the description of the conventional technique, and in order to avoid redundant description, the same elements and names are assigned the same reference numerals. Hereinafter, in the drawings after FIG. 2, the same elements and names will be denoted by the same reference numerals.

Head element (not shown) for recording / reproducing
The slider 1 on which is mounted is attached to the surface of the support arm 2 facing the magnetic recording medium 12 so that the head element faces the magnetic recording medium 12. As will be described later, the support arm 2 is supported by the first bearing portion 3 and the second bearing portion 4, and the magnetic bearing medium 12 is supported by the first bearing portion 3.
In the radial direction, the second bearing portion 4 can rotate in the vertical direction, which is a so-called “slipping” operation, with respect to the surface of the magnetic recording medium 12.

The magnetic recording medium 12 is rotatably supported by a spindle motor 5 which is a rotating means, and the magnetic recording medium 12 is rotated during recording or reproduction of the magnetic disk device 29, that is, when the magnetic head is loaded. Due to the relationship between the levitation force due to the air flow generated by the above and the urging force of the head support mechanism 9 that urges the slider 1 toward the magnetic recording medium 12, the magnetic head mounted on the slider 1 moves toward the magnetic recording medium 12. Recording or reproducing is performed with a certain flying height.

The head actuator 26 includes a support arm 2, a first bearing portion 3, a second bearing portion 4, a coil 16, a coil holder 17, an upper yoke 19 (not shown in FIG. 1), a magnet 20, and a lower yoke. 21 and 21.

Further, in order to improve the impact resistance and increase the storage capacity, the guide portion 2a formed at the tip of the support arm 2 is placed on the ramp portion 18 for holding the head when the magnetic recording medium 12 is stopped. The magnetic recording medium 12 is retreated from the surface of the magnetic recording medium 12 so as to run up. Therefore, the ramp portion 18 is provided with a tapered portion 18a and a holding portion 18b. This prevents the slider 1 and the magnetic recording medium 12 from being damaged by the attraction or impact of the slider 1 on the magnetic recording medium 12. A control circuit 23 for controlling the head actuator 26 or performing signal processing is provided in the housing 15 and is connected to these by a flexible wiring board 27. The control circuit 23 as this control means
May be provided outside the housing 15. The casing 15 holds them in a predetermined relationship and seals them with a lid (not shown) having substantially the same shape as that of the casing 15 to prevent the influence of minute dust and air flow change. There is.

FIG. 2 is a sectional view taken along the line AA shown in FIG. In addition, as in FIG. 1, the support arm 2 includes the ramp unit 1.
8 shows a state in which the magnetic head is held, that is, a state in which the so-called magnetic head is unloaded. The shape near the bearing is shown from the side.

In FIG. 2, the first bearing portion 3 is constructed so as to have a ball bearing (not shown) inside, and the outer peripheral portion 3a can freely rotate, and the inner peripheral portion 3b can be freely rotated. It is fixed to the housing 15 with screws. The lower yoke 21 to which the magnet 20 is fixed is fixed to the housing 15, and the upper yoke 19 is fixed to the magnet 20 via a predetermined gap, and the upper yoke 19, the magnet 20 and the lower yoke 21 are magnetic. The circuit is configured. Further, a coil holder 17 fixed to the support arm 2 by mounting a coil 16 (not specifically shown in FIG. 2) is arranged in the magnetic gap. Therefore, the coil 16, the magnet 20, the upper yoke 19 and the lower yoke 21 make VC
M24 is formed, and by the action of this VCM 24, the support arm 2 is configured to be rotatable with respect to the magnetic recording medium 12 about the first bearing portion 3 in the radial direction.

Further, magnetic members 22 are held on the outer diameter side edge of the coil holder 17 (two locations in FIG. 1). The magnetic member 22 is arranged at a radius position substantially larger than the outermost diameter of the facing magnet 20 so as not to affect the seek operation of the VCM 24.

The head support mechanism 9 shown in FIG. 2 is provided with a gimbal mechanism 13 using a gimbal spring, and the magnetic disk device is supported by freely supporting it in the roll and pitch directions via the dimples 14. At the time of recording / reproducing 29, an unnecessary inclination of the slider 1 having the head element with respect to the magnetic recording medium 12 in the roll and pitch directions,
It can be absorbed by the gimbal mechanism 13.

FIG. 3 is an exploded perspective view showing the structure in the vicinity of the first bearing part 3 and the second bearing part 4. The structure will be described with reference to FIG. 2 described above. A magnetic recording medium 12 is provided on the slider 1.
In the first embodiment, this urging means is an elastic member 6 made of, for example, a ring-shaped leaf spring, and is made of a material such as stainless steel or phosphor bronze. To produce. This ring-shaped elastic member 6
Is a fixing member 1 in which a half of the ring has a semi-annular shape.
0 is fixed to the lower surface of the support arm 2 and the other area is pulled toward the lower surface of the support arm 2 (the surface on which the coil holder 17 is fixed). In addition, this fixing member 1
0 and the area portion of the elastic member 6 fixed to the fixing member 10 are both located in the opening 2b of the support arm 2 so as not to hinder the vertical movement of the support arm 2.

Further, the coil holder 17 to which the coil 16 facing the magnet 20 is fixed is fixed to the supporting arm 2 to form a head supporting arm combination 28. The head actuator 26 includes the second bearing portion 4, the head support arm coupling body 28, and the collar 7 in the illustrated arrangement,
It is configured such that it is inserted into the first bearing portion 3, screwed from below with a nut 8, and the inner peripheral portion 3b of the first bearing portion 3 is fixed to the housing 15.

In the collar 7, the semi-annular portion 7a located on the slider 1 side is formed thicker than the semi-annular portion 7b on the opposite side, and the semi-annular portion 7a is formed in the opening of the support arm 2. 2b, the elastic member 6 and the fixing member 10 are
It is pressed against the bearing portion 4 of. Also, the protrusion 7c of the collar 7
Enters the recess 2c provided in the opening 2b of the support arm 2 and presses it against the second bearing portion 4. That is, the fixing member 10 and a part of the elastic member 6 fixed to the fixing member 10 include the first bearing portion 3, the second bearing portion 4, the semi-annular portion 7 a of the collar 7, and the collar 7. It is fixed by the protrusion 7c and the nut 8.

The first bearing portion 3 has a bearing (not shown) between the outer peripheral portion 3a and the inner peripheral portion 3b.
a is configured to be freely rotatable. further,
The second bearing portion 4 has a pair of pivots 4a and 4b, and the pair of pivots 4a and 4b serve as a fulcrum of a pivoting operation of the support arm 2 in a direction perpendicular to the recording surface of the magnetic recording medium 12. .

Further, the pair of pivots 4 of the second bearing portion 4
The positions where a and 4b are formed are positions symmetrical with respect to a line (BB line shown in FIG. 4) connecting the slider 1 and the center of the first bearing portion 3, and BB It is formed on a line (C-C line shown in FIG. 4) perpendicular to the line. Also, the second
The bearing portion 4 is formed by a pair of pivots, but may be formed in a wedge shape on the same line.

In the magnetic disk device 29 of the present invention,
With the head support mechanism 9 having such a configuration,
The support arm 2 can be formed of a highly rigid material. Therefore, from the second bearing portion 4, the pair of pivots 4
The head supporting mechanism 9 can be formed of a material having a high rigidity in all areas including a, 4b, and the area where the slider 1 supported by the supporting arm 2 is formed.

If the support arm 2 is made of a highly rigid material, the resistance to external impacts and the like can be improved and the resonance frequency of the support arm 2 can be increased, which has been a conventional problem. The vibration mode does not occur, the settling operation is not required, the support arm 2 can be rotated and positioned at high speed, and the access speed of the magnetic disk device 29 can be improved.

Further, the elastic member 6 is not incorporated in the structure of the support arm 2, that is, is not integrally formed,
Since it is provided independently of the support arm 2, by changing the thickness, material, etc. of the leaf spring of the elastic member 6,
It is possible to select the strength and spring constant of the elastic member 6.

The center of gravity of the portion held by the elastic member 6, for example, when rotating by the VCM 24, supports the center of gravity of the support arm 2 with the coil 16 and the coil holder 17 mounted. The same as the intersection of the rotation axis of the arm 2 in the radial direction of the magnetic recording medium 12 and the rotation axis of the arm 2 in the direction perpendicular to the recording surface of the magnetic recording medium 12, that is, the support arm 2 and the pair of pivots 4a, 4b. By designing the head support mechanism to be substantially at the same position as the middle point (point P in FIG. 4) on the line connecting the abutting points, a stable head support mechanism with less vibration against external impacts and the like. 9 can be provided. In this case, a slight shift in the center of gravity does not pose any practical problem.

In the magnetic disk device 29 configured as described above, the magnetic recording medium 12 is moved to the spindle motor 5
When rotated by, an air flow is generated on the surface of the magnetic recording medium 12. In this state, the VCM 24 is driven to rotate the support arm 2 so that the slider 1 held by the ramp portion 18 is levitated to a predetermined track position on the magnetic recording medium 12. With the slider 1 floating, information is recorded on the magnetic recording medium 12 or reproduced on the magnetic recording medium 12 using a head element (not shown).

Next, the retracting means for unloading the magnetic head and its operation in the disk device of the present invention will be described.

1 and 2, the magnetic recording medium 1
A ramp portion 18 serving as a retracting means for holding the support arm 2 is provided on the outer side of the support arm 2. The lamp part 18 is made of a resin having good slidability, such as LCP (liquid crystal polymer),
PPS (polyphenyl sulfide), POM (acetal copolymer) or the like is used. When the magnetic recording medium 12 stops rotating (at the time of unloading), one end side of the supporting arm 2 on which the slider 1 is provided rotates toward the outside of the magnetic recording medium 12 to move the supporting arm 2 to the outside. The guide portion 2a provided at the tip portion rides on the taper portion 18a provided on the ramp portion 18 and is held by the holding portion 18b formed in a slightly recessed shape.

When the magnetic recording medium 12 is stopped, the support arm 2 rotates while the guide portion 2a rides on the taper portion 18a of the ramp portion 18, and the stop operation is completed at a predetermined position of the holding portion 18b. The tapered portion 18a of the ramp portion 18
When the head supporting arm combination 28 is mounted on the magnetic recording medium 12, the head supporting arm combination 28 rotates about the pair of pivots 4a and 4b in the vertical direction with respect to the surface of the magnetic recording medium 12.
The amount of magnetic air gap between the magnetic member 22 and the magnet 20 is reduced. Therefore, the magnetic member 22 is attracted by the magnet 20 in the X direction shown by the arrowed line in FIG. 2, and a force in a direction away from the magnetic recording medium 12 is applied to the tip portion of the support arm 2 where the guide portion 2a is formed. Works. Therefore, the contact pressure of the guide portion 2a with respect to the tapered portion 18a of the ramp portion 18 is reduced, and the sliding load is reduced.
In other words, the guide portion 2a has a small sliding load,
It is possible to ride on 8a. By such an operation, it is possible to reduce the sliding load caused by the contact of the guide portion 2a with the ramp portion 18.

Therefore, since the torque required by the VCM 24 can be reduced, the magnetic disk device 2
Even when the entire 9 is downsized, the VCM 24 can be downsized while satisfying the required torque, and the entire magnetic disk device 29 can be downsized and thinned.

Although the magnetic member 22 is provided at two locations in the first embodiment of the present invention, the present invention is not limited to this example, and the magnetic member 22 is disposed at one location. Good. Further, in the present embodiment, the magnetic member 22 is arranged at a radial position larger than the outermost diameter of the magnet 20, but it is arranged at a position facing the magnet 20 within a range that does not affect the flying characteristics of the slider 1. You may. Further, in the present embodiment, the shape of the magnetic member 22 is illustrated as a small cylinder, but it may be formed of a small ellipsoidal or small spherical magnetic body.
In addition, it goes without saying that the present invention does not limit the arrangement position, the number of arrangement, or the shape of the magnetic member 22.

As described above, in the head supporting device and the disk device using the same according to the first embodiment of the present invention, the supporting arm attached to the head actuator part and the operating part are the first and the first. Since it is composed of two elements, the two bearings, it has a high degree of freedom in design, is thinner than conventional ones, has superior shock resistance, allows high-speed access, and is highly portable. It is possible to provide a head supporting device and a disk device using the same.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIGS. 5 and 6. FIG. 5 is a plan view for explaining the configuration of the disk device according to the second embodiment of the present invention. The state in which the support arm 2 approaches the taper portion 18a of the ramp portion 18, that is, the state in which the so-called magnetic head is just before unloading. Is shown. In addition, FIG.
[Fig. 6] is a plan view of a magnet constituting a VCM of a head actuator according to a second embodiment of the present invention.
In the disk device according to the present embodiment, the magnet 20 that faces the magnetic member 22 near the unload position.
2 is different from the first embodiment in that the planar shape of is locally different. A bulged portion 20a having a large radial dimension is formed on the outer peripheral edge of the magnet 20 facing the magnetic member 22 in the vicinity of the unloading.

With the magnetic disk device 29 having such a structure, the attraction force by the magnet 20 is further increased, so that the tip end portion of the support arm 2 where the guide portion 2a is formed is separated from the magnetic recording medium 12. The force in the direction of doing works more. Therefore, the contact pressure of the guide portion 2a with respect to the tapered portion 18a of the ramp portion 18 is further reduced, and the sliding load is reduced. That is, the guide portion 2a is
It is possible to ride on the tapered portion 18a with a smaller sliding load.

Generally, the strength of the magnetic flux of the magnet decreases at the edge of the magnet, so that the torque decreases at the end of the rotation range of the VCM 24. In the present embodiment, however, the bulge increases. Since the portion 20a is provided, the coil 16
The magnetic flux interlinking with each other increases, and as a result, the VCM torque near the unload position increases and the torque characteristic can be improved. Therefore, a greater effect can be expected with respect to downsizing and thinning of the VCM 24.

In the second embodiment of the present invention, the planar shape of the magnet 20 is such that the outer peripheral edge portion has a larger radial dimension, but the present invention is not limited to this, and the magnetic member 22 is used. Suction with the desired suction force, coil 1
The shape is not particularly limited as long as it has a shape in which the interlinkage magnetic flux to 6 increases.

As described above, in the disk device according to the second embodiment of the present invention, the planar shape of the permanent magnet constituting the VCM attached to the head actuator portion has a large radial dimension at the outer peripheral edge portion. It is configured to form a bulging part that increases the magnetic flux linked to the coil,
It means that the VCM torque is increased and the torque characteristic can be further improved. As a result, it is possible to further reduce the size and thickness of the VCM, and to provide a disk device that is thinner, lighter, and more portable than the conventional one.

Further, in the first and second embodiments of the present invention, the example in which the ramp section 18 is provided outside the magnetic recording medium 12 is shown.
Needless to say, even when the magnetic recording medium 12 is provided on the inner peripheral portion of the magnetic recording medium 12, the same effect can be obtained.

In the embodiment of the present invention, the magnetic recording medium is used as the recording medium and the magnetic disk device using the magnetic head is described. However, the disk device of the present invention is different from the magnetic recording medium in recording. The same effect can be obtained when it is used as a non-contact type disk recording / reproducing apparatus that uses a medium, such as an optical disk apparatus or a magneto-optical disk apparatus.

[0064]

As described above, according to the present invention, the head supporting mechanism having high flexibility, high impact resistance, and high speed access while having a sufficient load applied to the head is provided. A disk device can be provided.

Further, in the head supporting device having the head supporting mechanism of the present invention and the disk device using the same, since the supporting arm can be moved up and down and the ramp portion is provided, the head is moved when the rotation of the recording medium is stopped. It is possible to hold the lamp portion apart from the recording medium.

Further, since the head supporting device of the present invention and the disk device using the same can reduce the sliding load caused by the contact of the guide portion with the ramp portion, the load applied to the VCM can be reduced as much as possible. However, it is possible to provide a disk device having a simple structure, a small size, a thin shape, high impact resistance, excellent portability, and high-speed access.

[Brief description of drawings]

FIG. 1 is a plan view showing a configuration of a head support device and a disk device using the same according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a configuration of a head support device and a disk device using the head support device according to the first embodiment of the present invention.

FIG. 3 is an exploded perspective view of a head actuator unit having a head support device according to the first embodiment of the present invention.

FIG. 4 is a plan view of a head actuator unit having a head support device according to the first embodiment of the present invention.

FIG. 5 is a plan view showing the configuration of a disk device according to the second embodiment of the present invention.

FIG. 6 is a plan view showing the shape of a magnet according to the second embodiment of the invention.

FIG. 7 is a plan view showing the configuration of a conventional disk device.

[Explanation of symbols]

1 slider 2 Support arm 2a Guide part 2b opening 2c recess 3 First bearing 3a outer peripheral part 3b inner circumference 3c Rotating shaft 4 Second bearing 4a, 4b pivot 5 Spindle motor 6 Elastic member 7 colors 7a, 7b Semi-annular part 7c protrusion 8 nuts 9 Head support mechanism 10 Fixing member 12 Magnetic recording media 13 Gimbal mechanism 14 dimples 15 housing 16 coils 17 Coil holder 18 Lamp part 18a taper part 18b holding part 19 Upper yoke 20 magnets 20a bulge 21 Lower yoke 22 Magnetic member 23 Control circuit 24 VCM (voice coil motor) 26 head actuator 27 Flexible wiring board 28 Head support arm combination 29 Magnetic disk unit 30 lock mechanism

Continuation of front page (56) Reference JP-A-5-334823 (JP, A) JP-A-6-84293 (JP, A) JP-A-5-73987 (JP, A) JP-A-5-159262 (JP , A) JP 9-82052 (JP, A) JP 2001-229634 (JP, A) JP 2001-297548 (JP, A) JP 2002-237160 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B 5/56-5/60 G11B 17/32-17/34 G11B 21/00-21/06 G11B 21/12-21/26

Claims (23)

(57) [Claims] 1. A support arm, a head mounted on a slider at one end of the support arm so as to face a recording medium, and the support arm being rotatable in a radial direction of the recording medium. Pivot bearing part having a pair of top parts that enable the support arm to rotate in a direction perpendicular to the recording surface of the recording medium.
When a feature in that the support arm, provided with an elastic means for imparting a biasing force in a direction approaching to the recording medium, comprising a magnetic member to reduce the biasing force
Head support device. 2. The head supporting device according to claim 1 , wherein the supporting arm is made of a highly rigid material. 3. The head support device according to claim 1 , wherein the elastic means is a leaf spring provided between the pivot bearing portion and the support arm. 4. The head support device according to claim 1 , wherein the elastic means is a leaf spring that connects the pivot bearing portion and the support arm. 5. The pair of tops are in contact with the support arm on a line that is perpendicular to the axial direction of the first bearing portion and the longitudinal direction of the support arm and that passes through the center of rotation of the recording medium in the radial direction. The head support device according to claim 1 , wherein the head support device is in contact with each other. 6. The head support apparatus of claim 1, wherein the apexes of the pivot bearing, characterized in that provided at symmetrical positions with respect to the longitudinal center line of the support arm. 7. Each apex of the pivot bearing head support according to claim 1, characterized in that contact with the support arm and a point or a line perpendicular to the parallel longitudinal to the main surface of said support arm, apparatus. 8. The elastic means allows vertical rotation.
The center of gravity of the support arm held in the position is the first axis.
2. The head support device according to claim 1 , wherein an intersection of the rotation axis of the receiving portion and the rotation axis of the pivot bearing overlaps with each other. 9. A recording medium rotatably supported, a support arm, a head mounted on a slider at one end of the support arm so as to face the recording medium, and the support arm for recording the recording medium. A first bearing portion that is rotatable in the radial direction of the medium; a pivot bearing portion that has a pair of top portions that allows the support arm to rotate in a direction perpendicular to the recording surface; A head support device provided with an elastic means for applying a biasing force in a direction approaching the recording medium, and the slider with respect to the rotation center of the first bearing portion in a direction parallel to the rotation axis of the recording medium. A pair of yokes opposite to each other with a gap, a magnet arranged in the gap of the yoke, and a magnetic gap held by the support arm and formed by the magnet and the yoke. did And a rotating unit that rotates the recording medium, and the head, the rotating unit, and the coil are electrically connected to exchange signals with the head to rotate the recording medium and rotate the support arm. A disk device comprising: a control unit for controlling, a retracting unit for retracting the head from the recording medium in a non-contact manner, and a magnetic member for reducing the biasing force. 10. The disk device according to claim 9 , wherein the magnetic member is integrally held by the coil. 11. The head is provided at a position other than near the unloading position.
The magnetic member is rotated about the rotation center of the first bearing portion.
Outside the outermost diameter of the magnet formed around
On the side, facing the magnet, When the head is near the unloading position, the magnetic member
The magnet so that the attractive force between the magnet and the magnet increases.
Swelling formed on the outer peripheral edge of the magnet
Characterized in that it is located opposite to the magnet
The disk device according to claim 10, wherein 12. The disk device according to claim 9 , wherein the retracting means is a ramp portion provided in a predetermined area of an outer peripheral portion or an inner peripheral portion of the recording medium. 13. The disk device according to claim 12 , wherein the ramp portion is formed of a material having a good friction coefficient and a small slidability. 14. The material having good sliding properties is a liquid crystal polymer,
14. The disk device according to claim 13 , which is a polyphenyl sulfide or an acetal copolymer. 15. The disk device according to claim 9 , wherein the support arm is made of a highly rigid material. 16. The disk device according to claim 9 , wherein the elastic means is a leaf spring provided between the pivot bearing portion and the support arm. 17. The disk device according to claim 9 , wherein the elastic means is a leaf spring that connects the pivot bearing portion and the support arm. 18. The pair of tops are in contact with the support arm on a line that is perpendicular to the axial direction of the first bearing portion and the longitudinal direction of the support arm and that passes through the center of rotation of the recording medium in the radial direction. The disk drive according to claim 9 , wherein the disk drive is configured to be in contact with each other. 19. The disk device according to claim 9 , wherein each top of the pivot bearing is provided at a position symmetrical with respect to a center line in the longitudinal direction of the support arm. 20. The disk device according to claim 9 , wherein the pair of tops are in contact with the support arm at a point or a line parallel to the main surface of the support arm and perpendicular to the longitudinal direction. 21. At least the first bearing portion, the pivot bearing, the elastic means, the support arm, and a coil holder to which the coil is fixed are provided, and an annular collar is provided under the coil holder, The disk drive according to claim 9 , wherein the head actuator is configured with the center of rotation of the first bearing portion as an axis. 22. Support held by said elastic means
The position of the center of gravity of the arm is the same as that of the rotation shaft of the first bearing portion.
The disk device according to any one of claims 9 to 21 , wherein the disk device overlaps with an intersection of the pivot bearing portion and the rotation axis. 23. The shape of the magnetic member is small cylindrical claim, wherein the small ellipsoidal, or pelletized 9
23. The disk device according to claim 22 .