JP2003030943A - Disk recording and playback device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impact resistance by absorbing a shock force by rotating a head slider in a pitch direction around a fixed point at a predetermined position when an external shock is applied to a disk device. To provide a good device. SOLUTION: A head slider 20 which performs recording and reproduction by an information conversion element while floating on the surface of a disk 2 by receiving a dynamic pressure by a fluid accompanying rotation of the disk 2 and a load force in a direction of the disk 2 is provided on the surface of the disk 2 When a shock is applied to the head slider 20 from the outside with respect to the intersection of the extension line of the medium facing surface and the disk surface when the head slider 20 is floating, a predetermined position at least outside the intersection is regarded as a fixed point. The head slider 20 having the medium facing surface that rotates in the pitch direction around the fixed point as the rotation center is mounted. With such a device configuration, a disk device having an impact resistance of about 650 G to about 800 G can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording / reproducing apparatus for recording / reproducing information on / from a disk-shaped recording medium by an information conversion element mounted on a head slider.

[0002]

2. Description of the Related Art In recent years, the technical progress of a disk recording / reproducing apparatus (hereinafter referred to as a disk apparatus) for recording / reproducing a disk-shaped recording medium such as a hard disk or an optical disk (hereinafter referred to as a disk) has been remarkably advanced. Applications are expanding in many fields as well as for computers. In such a disk device, further high-density recording is achieved, and the disk and head slider are not damaged even when subjected to a disturbance such as a shock, stable recording / reproducing is possible, and a small device that can be mounted in a portable device. Is required.

FIG. 4 is a perspective view of a main part of a conventional disk device. The disk 2 is supported by the main shaft 1 and is driven by the driving means 3
Is driven to rotate. As the driving means 3, for example, a spindle motor is used. A head slider 4 having an information conversion element (not shown) for recording / reproducing is fixed to a suspension 5, the suspension 5 is fixed to an actuator arm 6, and the actuator arm 6 is rotatably attached to an actuator shaft 7. Has been.

A voice coil motor is used as the positioning means 8, and the actuator arm 6 is swung to move the head slider 4 to a predetermined track position on the disk 2. The housing 9 holds them in a predetermined positional relationship and at the same time, prevents the influence of an external air flow and the intrusion of dust by a lid not shown.

FIG. 5 is a perspective view of a main part of a head support portion 10 including a suspension 5 and a head slider 4.
The head slider 4 is fixed to a tongue-shaped portion 12 provided at the tip of the slider holding portion 11. The other end of the slider holding portion 11 is fixed to the beam 13. The slider holding portion 11 uses, for example, a gimbal spring, and has a shape that allows the pitch movement and the roll movement with respect to the head slider 4. The head slider 4 is fixed to the slider holding portion 11 by, for example, bonding with an adhesive, and the slider holding portion 11 is fixed to the beam 13 by welding, for example. Beam 1
A pivot 14 for urging a load on the head slider 4 is provided at the tip end of 3, and a predetermined load force for urging the head slider 4 in the disk direction is applied via the pivot 14. The suspension 5 is composed of the beam 13 having the pivot 14 and the slider holding portion 11 having the tongue-shaped portion 12, and further, the head supporting portion 10 is constituted by including the head slider 4.

When recording / reproducing is performed on the rotating disk 2 using the head supporting portion 10 as described above, the head slider 4 is lifted from the disk 2 by the load force applied from the pivot 14 and the flow of viscous fluid such as air. Three forces, a positive pressure that works so as to act and a negative pressure that works so as to approach the disk 2, act, and the head slider 4 floats due to the balance of these forces, and the positioning means 8 keeps this flying height. The information conversion element (not shown) performs recording / reproduction while driving and positioning at a predetermined track position.

However, in the above-mentioned conventional disk device, when an external shock is applied, the head slider collides with or contacts the disk, causing wear or damage to the head slider or the disk, resulting in data destruction or device damage. It could be damaged.

Therefore, in Japanese Patent Laid-Open No. 9-153277, a mounting member that receives vibration from the outside is provided, and the disk device body is coupled to this mounting member by using a heat insulating support member having a flexible structure. Are prevented from being transmitted to the main body of the device. As a result, a disk device that is strong against external vibration is realized, but the entire device becomes large, so it is difficult to install such a device in a portable device that requires compactness and light weight.

Therefore, it is required to improve the shock resistance of the head slider, the suspension, or the actuator arm itself so as to simultaneously achieve the downsizing and the shock resistance of the disk device. In particular, since the head slider faces the disk with a small flying height, it is required to prevent at least fatal damage to the head slider and the disk when an impact force is applied.

In Japanese Patent Laid-Open No. 2000-306226,
It is shown that the head slider is chamfered and rounded so that the disk surface is not damaged even when a large shock is applied to the disk device and the head slider collides with the disk surface. In this way, by rounding the apex portion, damage is less likely to occur even if a collision occurs, and impact resistance can be improved.

Further, in Japanese Patent Laid-Open No. 2000-339896, when the head slider is largely rotated in the roll direction due to an unexpected impact or the like, the corners of the head slider collide with the disk and damage the disk. In order to prevent this, a disk device equipped with a head slider having a pair of front pads on the upstream end side and a rear pad on the downstream end side is shown. It has been shown that such a shape controls the air flow between the head slider and the disk, prevents uneven pressure generated due to the air flow, and prevents rotation in the roll direction. There is.

In the head slider disclosed in Japanese Unexamined Patent Publication No. 10-283622, the head slider is located near the downstream end portion in the length direction (hereinafter referred to as slider length) of the head slider from the upstream end portion to the downstream end portion. There is shown a head slider configuration in which a positive pressure generating portion that generates a large positive pressure and a negative pressure generating portion that generates a negative pressure are centrally provided to increase air film rigidity. The point where the flying height does not fluctuate even when the head slider is pitched and the flying posture changes is defined as the focus. With the above configuration, the position of this focus is located on the downstream side where the information conversion element is provided. It can be very close to the end. As a result, even if the skew angle fluctuates, the atmospheric pressure fluctuates, the external force fluctuates due to rocking, or the load force fluctuates, the levitation amount near the information conversion element hardly changes due to the action of the positive pressure and the negative pressure. It enables stable recording and reproduction of information.

[0013]

In the second example described above,
The head slider has a chamfered shape so that the disk is not damaged even if the head slider and the disk collide due to an impact. With such a shape, it is possible to obtain the effect that damage is less likely to occur even if the disk collides with the disk, but the head slider is required to be downsized in the disk device mounted on a mobile device, and therefore the designed value is kept. There is a problem that extremely high processing accuracy is required to chamfer the corner while obtaining the medium facing surface shape.

Further, in the third example, the air flow between the head slider and the disk is controlled so that the non-uniformity of the pressure caused by the air flow does not occur, so that the rotation in the roll direction is performed. Has been shown to improve the impact resistance. However, improvement of impact resistance by preventing rotation in the roll direction is limited, and it is difficult to secure sufficient impact resistance that can be installed in a mobile device.

Further, in the fourth example, the medium facing surface is positioned so that the focal point is located at the downstream end of the head slider in order to prevent fluctuation of the flying height at the downstream end where the information conversion element is provided. And the point of action of the load force is arranged. As a result, even if the flying posture changes due to the skew angle, atmospheric pressure fluctuation, load force fluctuation, or the like, the flying height of the downstream end where the information conversion element is provided can be stabilized. However, when comparing such a variation amount and the impact force applied from the outside, the impact force is much larger, and therefore the above example cannot be said to be effective for the impact force.

That is, when a large impact force acts on the head slider such that the focal point is located at the downstream end, the head slider has a negative pitch angle, that is, the flying height at the upstream end is equal to that at the downstream end. There may be a case where the flying height becomes smaller than the flying height. When such a state occurs, a fluid film made of a viscous fluid such as air cannot be formed between the medium facing surface and the disk surface, so that the flying force is lost and the head slider may collide with the disk and be damaged.

According to the present invention, when a shock is applied to the disk device from the outside, an extension line of the center line in the viscous flow direction of the medium facing surface of the head slider (hereinafter referred to as a medium facing surface extension line) and the disk surface are provided. By providing a fixed point at least outside of the intersection point as a fixed point and rotating the fixed point as a rotation center in the pitch direction to absorb the impact force, a disk device having improved impact resistance is provided. It is a thing.

[0018]

In order to solve the above-mentioned problems, a disk recording apparatus of the present invention has a structure in which a head slider floats on the surface of a disk, and recording / reproducing is performed by an information conversion element. When a shock is applied from the outside to the disk device with reference to the intersection between the medium facing surface extension line and the disk surface when the surface is levitating on the surface with a certain inclination angle, a predetermined value at least outside the intersection is applied. The medium facing surface is configured so that the position is a fixed point, and the fixed surface is rotated in the pitch direction about the fixed point.

With this structure, even if a shock is applied to the disk device, the head slider rotates in the pitch direction while maintaining a positive pitch angle with the fixed point at a predetermined position at least outside the above-mentioned intersection as the center of rotation. To do. Since the positive pitch angle is maintained, the fluid film between the medium facing surface and the disk is not broken and spring rigidity is maintained, and impact force can be absorbed by this spring rigidity. Therefore, prevent collision and damage to the disc,
It is possible to realize a disk device that has high impact resistance and can be mounted on a mobile device.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION A disk device of the present invention comprises a disk, drive means for rotating the disk, an information conversion element for performing at least one of recording and reproduction on the disk, and information on a medium facing surface facing the disk. The head slider includes a conversion element, a suspension that supports the head slider, an actuator arm that supports the suspension, and a positioning unit that positions the head slider at a predetermined track position on the disk via the actuator arm. . Further, when an external impact is applied to the disk recording / reproducing device with reference to the intersection of the medium facing surface extension line and the disk surface when the head slider is flying above the disk surface, at least outside this intersection. The medium facing surface is configured to rotate in the pitch direction about this fixed point as a fixed point.

When the distance from the point of action where the load force acts on the head slider to the above-mentioned intersection is Ld and the distance from the point of action to the fixed point is Lo, Lo / L
The d ratio is preferably 1 or more and 2.5 or less. Such a Lo value is obtained by appropriately designing the spring rigidity of the fluid film formed between the medium facing surface and the disk when the head slider is flying over the disk surface. Such spring rigidity can be freely set depending on the shape of the medium facing surface if the viscosity coefficient of the viscous fluid, the disk rotation speed, the skew angle, the load force, etc. are constant. Therefore, by designing the medium facing surface so that the Lo value falls within the above range, it is possible to prevent the head slider from colliding with the disk surface even if a large impact force acts, or to reduce the energy at the time of collision. It is possible to prevent the head slider or the disk from being damaged, and it is possible to realize a highly reliable disk device.

Although the flow velocity of the fluid is different between the inner peripheral side and the outer peripheral side of the disk, it is desirable to set the spring rigidity on the inner peripheral side where the flow velocity is the smallest for impact resistance.

Further, in the disk apparatus of the present invention, the head slider has positive pressure generating portions provided at predetermined positions from the upstream side end portion and the downstream side end portion, respectively, and a negative pressure generating portion provided between these positive pressure generating portions. A pressure generating portion is provided, and the center position of the negative pressure generated by the negative pressure generating portion is located on the downstream end side with respect to the point of application of the load force from the suspension. With this configuration, even if the positive pressure generated by the positive pressure generating section provided near the downstream end is greater than the positive pressure generated by the positive pressure generating section near the upstream end, the negative pressure generated by the negative pressure generating section is increased. As a result, a positive pitch angle can be stably achieved during the levitating operation. Further, when an impact force is applied, the spring rigidity of the viscous fluid film effectively acts and the energy with which the head slider collides with the disk can be greatly reduced, damage to the head slider or disk is prevented, and shock resistance is improved. A large disk device can be realized.

Further, the disk device of the present invention is constructed such that the sum of the mass of the head slider and the equivalent mass of the suspension is 0.5 mg or more and 10 mg or less. With such a device configuration, even when the disk device receives an impact from the outside, the impact force itself applied to the head slider can be reduced, so that the tolerance for the viscous fluid film rigidity can be increased and a large value can be obtained. A disk device that can withstand shock acceleration can be obtained.

Further, the disk apparatus of the present invention has a structure in which the load force for urging the head slider in the disk direction by the suspension is set to 2 gf or less. If the load force is increased, the followability with respect to the disk is improved, but the possibility of collision with the disk when the positive pressure fluctuates due to impact or dust entrainment increases. In addition, it is also necessary to increase the positive pressure in order to stably levitate,
It becomes difficult to reduce the shape of the head slider.
To be mounted on a mobile device, it is required to reduce the size of the head slider and the rotation speed of the disk, but by satisfying this requirement with a load force of 2 gf or less, it is small, thin, and shock resistant. It is possible to realize a disk device with high performance. It is also possible to use the mass of the head slider itself as the load force without applying any load force from the suspension.

The disk device of the present invention is a magnetic disk in which a magnetic recording layer is formed on only one surface of the disk, the information converting element is a magnetic head, and the disk and the information converting element are mounted in a pair. Is. With this configuration, even if an external shock is applied to the disk device, it is sufficient to improve the shock resistance with respect to the combination of the pair of head sliders and the disk. It is possible to realize a disk device which can be effectively used, is extremely thin and small, and has excellent impact resistance.

Further, in the disk device of the present invention, an inclined surface is provided from the center of the disk to the outer peripheral end from the center of the disk on the surface where the magnetic recording layer is not formed, and the thickness of the disk is set to the outer peripheral end. It is a structure that is thinned toward a certain ratio. With this configuration, the deformation of the disk itself can be reduced when it receives a shock, so that a disk device with higher shock resistance can be realized by combining it with the above head slider.

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment) FIG. 1 shows a medium facing surface of a head slider used in a disk device according to an embodiment of the present invention. The head slider 20 is provided with a medium facing surface 28 that faces the disk on one surface of a substantially rectangular parallelepiped shape. The medium facing surface 28 has a positive pressure generating portion 21 and a negative pressure generating portion 2
21 including a lower step surface 22, a first middle step surface 23 formed to connect the upstream end portion 26 to the first positive pressure generating portion 211, and a second positive pressure generating portion 212 to the upstream end. Part 26
The second intermediate step surface 24 is provided so as to extend in the direction.

The positive pressure generating section 21 is the first positive pressure generating section 21.
1 and side rails 213 formed on both sides in the slider width direction so as to be connected to the first positive pressure generating portion 211.
And the second positive pressure generating portion 2 formed in a hexagonal shape as shown in the drawing in the central portion in the slider width direction on the downstream end 27 side.
It consists of 12. The first positive pressure generating portion 211 provided at a predetermined position from the upstream end 26 has a slider width direction portion and a skewed portion for connecting the slider width direction portion to each side rail 213. Consists of. The lower surface 22 includes the first positive pressure generating portion 211 and the side rails 2.
13, and the negative pressure generating portion 221 that is substantially surrounded by the second middle step surface 24, the side lower step surface 222 located outside the side rail 213, and the outflow side provided near the downstream end 27. It is composed of a lower surface 223. Information conversion element 25
Is integrally provided very near the downstream end 27 of the second positive pressure generating part 212.

These processes can be carried out by head slider mold forming or general-purpose machining, but more preferably, wet or dry etching is performed, and a laser is used for highly precise and complicated machining. Processing by beam irradiation, processing by ion irradiation, or the like can be used.

In the present embodiment, the step difference between the positive pressure generating portion 21 and the first intermediate step surface 23 and the second intermediate step surface 24 is 0.1 μm, and the positive pressure generating section 21 is processed by using the ion irradiation processing method. The step between the lower surface 22 and the negative pressure generating portion 221 was 1.2 μm. As for the overall shape of the head slider 20, the slider length, slider width, and thickness are 1.30 mm, 1.05 mm, and 0.
It is 30 mm.

The head slider 20 is fixed to the suspension 5 shown in FIG. 5, but the load force by the pivot 14 provided at the tip of the beam 13 of the suspension 5 is equal to the slider length which is also the center of gravity of the head slider 20. It was set to be the center. Further, in the head slider of the present embodiment, the center of negative pressure is located on the downstream end side with respect to the point of application of the load force.

FIG. 2 is a cross-sectional view of essential parts showing a state in which a magnetic disk having a magnetic recording layer formed on only one surface of the disk and an inclined surface provided on the other surface is attached to the drive means. In the magnetic disk 30, a magnetic recording layer 32 is formed on one surface of a disk substrate 31, and the opposite surface is formed so that the plate thickness gradually decreases from the center toward the outer periphery. The drive means 65 is, for example, a spindle motor, and has a rotor 35 to which a rotary magnet 37 is attached,
The stator 5 provided so as to face the rotating magnet 37.
0, a bearing portion 45 that rotatably supports the rotor 35, and a frame 55 that fixes the bearing portion 45 and the stator 50. Further, the rotor 35 includes a rotary table 38 to which a rotary magnet 37 is attached via a back yoke 36, and a shaft 39 fixed to the rotary table 38. Further, the bearing portion 45 is a radial bearing 46.
And a thrust bearing 47. A suction plate 60 made of a soft magnetic material is circumferentially provided on the frame 55 so as to face the rotary magnet 37 to prevent the rotor 35 from floating above the bearing portion 45.

The magnetic disk 30 is fixed to the drive means 65 by aligning the center of the shaft 39 constituting the rotor 35 with the center of the magnetic disk 30 and adhering and fixing them by the adhering portion 40.

The structure of the disk device using the driving means to which the magnetic disk is fixed and the actuator arm to which the head supporting portion including the head slider is fixed is the same as that of the conventional disk device shown in FIG. The same is true and the recording / reproducing operation is also similar to that of the conventional disk device, and therefore its explanation is omitted. In the above disk device, the distance between the intersection of the extension line of the medium facing surface and the disk surface in the flying state of the head slider 20 and the point of action of the load force is Ld, and the distance between the fixed point and the point of action is Lo. As a result, Ld and Lo were obtained and the impact resistance was evaluated. In this embodiment, the equivalent mass of the suspension 5 and the head slider 4 is 8 mg, and the equivalent mass of the disk 2 is 8 mg.
Head slider pitch angle θ when flying over the surface
p is 70 μrad, the flying height Xt at the downstream end is 13 nm, the load force from the suspension 5 is 2 gf, the rotational speed of the disk is 4500 rpm, and the skew angle is −5.
It is degree.

A method of obtaining Lo and Ld will be described below with reference to FIG. A solid line shows a state in which the head slider 20 is flying on the disk 2 with a pitch angle θp and a flying height Xt at the downstream end, and an impact force F acts on the head slider 20 to cause a vertical displacement x, pitch. The head slider 20a in the state of being displaced by the angular displacement θ in the direction is shown by a chain line. As shown in the figure, the fixed point G is indicated by the intersection of the extension lines of the head slider 20 in the steady flying state and the extension line of the head slider 20a after being displaced by the impact. The point of action P1 of the load force is the center of the head slider 20 in the disk rotation direction, and the load force from the suspension (not shown) is also applied to this portion.

The center position of the medium facing surface of the head slider 20 rotates about the fixed point G from the steady flying state P1 to the position P2 after displacement. The distance Lo from the action point P1 to the fixed point G at this time can be regarded as cos θp≈1 because θp is very small, and can be obtained by (Equation 1).

[0039]

[Equation 1]

On the other hand, when the displacement with respect to the impact force F is the rotation around the point P1 of the load force and the translational movement of the position of the point of action in the disk direction, the point P1 of the load force on the head slider 20 is used as a reference. The displacement in the direction perpendicular to the disk 2 is represented by x, and the rotation is represented by θ, which is expressed by (Equation 2).

[0041]

[Equation 2]

Here, k ₁₁ , k ₁₂ , k ₂₁ , and k ₂₂ are rigidity coefficients of the viscous fluid film of the head slider 20, and k
₁₁ is vertical rigidity, k ₂₂ is rotational rigidity, and k ₁₂ and k ₂₁ are coefficients of the force in the rotational direction generated when the head slider 20 moves in the direction perpendicular to the disk 2 and the vertical force generated by the rotational motion. Is the coefficient of. (Equation 3) can be obtained by modifying this equation.

[0043]

[Equation 3]

Therefore, the distance Lo to the fixed point is (number
From (1) and (Equation 3), the viscous fluid film
Rolling rigidity k_{twenty two}And the relationship of the vertical force generated by the rotational movement
A few k _{twenty one}Is calculated as the ratio of.

[0045]

[Equation 4]

The above-mentioned stiffness coefficients k ₂₂ and k ₂₁ are uniquely obtained if the shape of the medium facing surface of the head slider, the disk rotation speed, the equivalent mass, etc. are determined, and the distance from this value to the fixed point is defined. can do. That is, the distance Lo from the position where the load force of the head slider acts to the fixed point G can be determined from the ratio of these two stiffness coefficients.

Further, the distance Ld from the point of application of the load force to the intersection point W of the extension line of the medium facing surface and the disk surface can be obtained by the same equation (5).

[0048]

[Equation 5]

Similarly, this Ld is uniquely obtained because the pitch angle θp and the flying height Xt of the downstream end can be obtained when the shape of the medium facing surface of the head slider, the disk rotation speed, the equivalent mass, etc. are determined. . The length Ls of the head slider described in (Equation 5) is a length parallel to the disk surface and is different from the actual slider length, but θp is very small and can be regarded as cos θp≈1. May be considered the same.

In the head slider 20 of this embodiment,
The Lo / Ld value thus obtained was 1.15, and the impact resistance value was about 800G. This Lo / Ld
When the value is 1, that is, the position of the fixed point coincides with the intersection, the head slider rotates in the pitch direction with this position as the center of rotation when a shock is applied, and the vertical displacement by the flying height Xt of the downstream end portion. Spring rigidity acts until
Can absorb impact force. However, when the Lo / Ld value becomes smaller than 1, a negative pitch angle occurs during vertical displacement by Xt, the fluid film is broken, the spring rigidity does not act, and the shock resistance sharply decreases. If the Lo / Ld value is greater than 1, the ratio of displacement in the vertical direction simply increases rather than rotating in the pitch direction to absorb the impact force, and thus the impact resistance gradually decreases. Disk devices for mobile devices are required to withstand shock acceleration of about 600 G or more.
It has been found that a d value of 2.5 or less is desirable.
Further, even if the Lo / Ld value is smaller than 1, a medium facing surface shape capable of securing about 600 G to 800 G can be obtained, but the impact resistance is greatly changed by a slight change, which makes it difficult to manufacture with good mass productivity. Is.

When the load force is larger than 2 gf, the positive pressure also needs to be increased accordingly, and the head slider shape becomes large, and the possibility of collision due to the positive pressure fluctuation due to dust inclusion increases. For this reason,
Even if the medium facing surface is set so that the distance Lo to the fixed point becomes a predetermined value with respect to Ld, the shock resistance value as set cannot always be obtained. It has been found that the load force is preferably 2 gf or less in order to reduce the variation in the impact resistance value.

Further, the smaller the sum of the mass of the head slider and the equivalent mass of the suspension, the less likely damage will occur. This is because even if a large impact acceleration acts, if the mass is small, the impact force itself applied to the head slider is also small. It has been found that by setting this value to 8 mg or less, damage can be prevented even if an impact acceleration of about 600 G to 800 G acts.

Further, in the disk device of the present embodiment, since the disk shape is such that the plate thickness becomes thinner toward the outer peripheral portion, the disk will be deformed more than the conventional disk even if impact acceleration acts on the device. It can be about 1/3. By reducing the amount of deformation in this way, it is possible to prevent the disk from colliding with the head slider due to the deformation of the disk even if a large impact acceleration is applied as compared with the prior art, and prevent damage from occurring. In addition, the maximum tensile stress and maximum compressive stress applied to the disc are about 1 / each of those of the conventional disc.
Since it can be set to 3, about 1/2, damage to the disk itself due to impact can be prevented.

In the present embodiment, the case where the load force is applied by the suspension has been described, but the present invention may be configured such that only the mass of the head slider itself acts as the load force. Furthermore, according to the present invention, the distance Lo to the fixed point obtained from the rigidity of the fluid film between the medium facing surface and the disk is Lo.
However, the medium facing surface shape may be set so as to have a predetermined value with respect to the distance Ld to the intersection of the medium facing surface extension line and the disk surface, and the shape is not limited to the head slider of the above-described embodiment. It goes without saying that there is no particular limitation as long as the medium facing surface is set so that the Lo value becomes a predetermined value.

Further, in the present embodiment, the case where the magnetic disk whose one surface is inclined and whose impact resistance is improved is used as the disk has been described, but the present invention is not limited to this. Needless to say, the effect may be obtained even if the disk has a conventional structure, or if a plurality of disks are stacked and a plurality of head sliders are used.

[0056]

As described above, the disk apparatus of the present invention has a structure in which the head slider floats above the disk surface, and recording / reproducing is performed by the information conversion element, and the above head slider is above the disk surface. When impact acceleration is applied to the head slider from the outside with reference to the intersection of the medium facing surface extension line and the disk surface when flying at an inclination angle, a fixed point is at least a predetermined position outside this intersection. The medium facing surface is configured to rotate in the pitch direction with the fixed point as the rotation center.

With this structure, even if an impact force is applied to the disk device, the head slider rotates in the pitch direction while maintaining a positive pitch angle with the fixed point at least outside the above-mentioned intersection as the center of rotation, Can absorb impact force. Therefore, it is possible to obtain a large effect that a collision and damage to the disk can be prevented, a shock resistance is large, and a disk device that can be mounted on a portable device can be realized.

A magnetic recording layer is formed only on one surface of the disk, and the opposite surface is a magnetic disk having a disk thickness reduced toward the outer peripheral end and a head slider in which the information conversion element is a magnetic head. By adopting the mounted device configuration, when impact acceleration is applied to the disc device from the outside, not only the head slider but also the disc itself can be deformed little, so that the impact resistance can be further increased as a whole. The effect is obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing a medium facing surface of a head slider used in a disk device according to an embodiment of the present invention.

FIG. 2 is a sectional view of an essential part showing a state in which a magnetic disk is fixed to a drive means in the magnetic disk device of the present invention.

FIG. 3 is a schematic diagram for explaining a distance to a fixed point of a head slider and a distance to an intersection.

FIG. 4 is a perspective view of a main part of a disk device using the conventional head slider and the head slider of the present invention.

FIG. 5 is a perspective view of a main part showing a head support part using a conventional head slider and a head slider of the present invention.

[Explanation of symbols]

1 spindle 2 discs 3 drive means 4,20 head slider 5 suspension 6 Actuator arm 7 Actuator axis 8 Positioning means 9 housing 10 Head support 11 Slider holder 12 tongue 13 beams 14 pivot 21 Positive pressure generator 22 Lower surface 23 First Middle Side 24 Second Middle Stage 25 Information conversion element 26 Upstream end 27 Downstream end 28 Medium facing surface 30 Disk-shaped recording medium (magnetic disk) 31 disk substrate 32 magnetic recording layer 35 rotor 36 back yoke 37 rotating magnet 38 turntable 39 axes 40 Adhesive part 50 stator 55 frames 60 suction plate 65 Drive means 211 First positive pressure generator 212 Second Positive Pressure Generator 213 Side rail 221 Negative pressure generator 222 Side lower surface 223 Outflow side lower surface

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tatsuhiko Inagaki             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F term (reference) 5D059 AA01 BA01 CA26 DA15 EA01

Claims (6)

[Claims] 1. A disc-shaped recording medium, a driving unit that rotationally drives the disc-shaped recording medium, an information conversion element that performs at least one of recording and reproduction on the disc-shaped recording medium, and opposes the disc-shaped recording medium. A head slider having the information conversion element mounted on the medium facing surface, a suspension that supports the head slider, an actuator arm that supports the suspension, and the head slider via the actuator arm. Positioning means for positioning at a predetermined track position, and when the head slider is floating above the surface of the disk-shaped recording medium, the extension line of the center line in the viscous flow direction of the medium facing surface and the disk shape. Based on the intersection with the surface of the recording medium, the disc A disk recording characterized in that the medium facing surface is configured to rotate in a pitch direction around the fixed point as a fixed point at least at a predetermined position outside the intersection, when a shock is applied. Playback device. 2. The head slider has a positive pressure generating portion provided at a predetermined position from each of an upstream end portion and a downstream end portion, and a negative pressure generating portion provided between the positive pressure generating portions. 2. The disk according to claim 1, wherein the center position of the negative pressure generated by the negative pressure generating portion of the head slider is located on the downstream end side with respect to the point of application of the load force from the suspension. Recording / playback device. 3. The disk recording / reproducing apparatus according to claim 1, wherein the sum of the mass of the head slider and the equivalent mass of the suspension is 0.5 mg or more and 10 mg or less. 4. The load force for urging the head slider toward the disk-shaped recording medium by the suspension is 2 gf.
The disk recording / reproducing apparatus according to any one of claims 1 to 3, wherein: 5. The disk-shaped recording medium is a magnetic disk in which a magnetic recording layer is formed only on one surface of the disk, and the information conversion element is a magnetic head, and the disk-shaped recording medium and the information conversion element are The disk recording / reproducing apparatus according to any one of claims 1 to 4, wherein a pair of disks is mounted. 6. The magnetic disk is provided with an inclined surface from a center of the disk to a peripheral edge portion from a center of the disk on a surface where a magnetic recording layer is not formed, and a thickness of the disk is oriented toward the peripheral edge portion. 6. The disk recording / reproducing apparatus according to claim 5, wherein the disk recording / reproducing apparatus is thinned at a constant rate.