JP3241127B2 - Disk unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive for positioning a head at a required position on a disk by moving an arm for supporting the head.

[0002]

2. Description of the Related Art At present, generally used magnetic hard disk devices employ a CSS (contact start / stop) system. In this scheme,
When the magnetic hard disk is stopped, the magnetic head is in contact with the disk surface, and as the disk rotates,
The magnetic head flies.

[0003] US Pat. No. 4,933,785 includes NC
A magnetic hard disk device of the SS (non-contact start / stop) type is disclosed. In this device, a cam follower member is provided on the disk-side surface of the head support suspension of the rotary actuator assembly inside the head slider (that is, on the actuator coil side), and a cam surface assembly is provided near the outer peripheral portion of the disk. During loading, the rotary actuator assembly is moved out of the disk to bring the cam follower member into contact with the cam surface, and then the rotary actuator assembly is moved along the cam surface to stop at the locked position.

[0004] US Pat. No. 5,027,241 also discloses the NC
An SS type magnetic hard disk device is disclosed.
In this apparatus, a cylindrical loading tab is provided at the tip of a suspension for supporting a head of a rotary actuator assembly, and a loading inclined structure is provided near an outer peripheral portion of a disk.
The actuator assembly is moved out of the disk to bring the loading tab into contact with the ramp of the loading ramp structure, and then the rotary actuator assembly is moved along the ramp to rest in the parking area.

[0005]

In the above-mentioned CSS type magnetic hard disk device, the liquid contained in the device adheres to the disk surface, so that a sticking phenomenon (stiction) between the magnetic head and the magnetic disk occurs. There is. As a countermeasure, a texture that makes the surface of the disk rough is formed, but this goes against the most basic requirement of magnetic recording to make the magnetic head as close as possible to the magnetic film of the disk. The higher density recordings that we are trying to achieve are an obstacle.

In the N-CSS system disclosed in the above-mentioned US Pat. No. 4,933,785, since the cam follower member is provided inside the head slider, a large force is required to lift up the head slider during unloading. And

Further, when the loading tab is made cylindrical as disclosed in the above-mentioned US Pat. No. 5,027,241, the sliding area with the loading inclined structure becomes large, so that contamination by sliding powder or the like occurs. . Further, when the loading tab is formed in a cylindrical shape, it is necessary to increase the arrangement position accuracy of the loading inclined structure.

At the time of loading and unloading of a conventional N-CSS magnetic hard disk drive, as shown in FIG. 41, the leading of a head slider 12P mounted on a suspension 8P via a flexure 10P. Since the end LE is closer to the disk 40 than the trailing end TE, the leading end LE is at an angle / posture that it sticks into the disk surface before the trailing end TE. That is, since the leading end LE of the head slider 12P is closer to the disk 40 than the trailing end TE, dynamic pressure hardly occurs between the disk 40 and the head slider 12P, and the disk 40 and the head slider 12P
Contact (i.e., collision) is likely to occur.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and has low contamination due to sliding, does not require high precision in the arrangement position of components, and does not require a large lift-up force during unloading. A first object is to provide an N-CSS disk device.

A second object of the present invention is to provide a disk drive capable of eliminating suspension loading loss.

A third object of the present invention is to reduce the possibility of contact between the head slider and the disk.

A fourth object of the present invention is to reduce the collision energy even when the head slider comes into contact with the disk.

[0013]

A first disk drive according to the present invention comprises: a suspension having one end fixed to an arm;
The distance between the flexure, which is located near the other end of the suspension and to which the head slider is attached, and the disk,
Increasing inclination toward the radial outside of the disc
Stop the slope and head slider at point contact.
Ramp with a recess provided for loading
And point-engagement with the ramp during unloading
As described above, at the end beyond the flexure mounting position of the suspension, a spherical projection provided to protrude toward the disk, and at the time of loading and unloading, to move the projection by engaging with the inclined surface, and a driving source for moving the arms, when the projection is located in the recess
When the height of the head slider is
Head slider when writing or reading
So that the height of the recess on the inclined base is equal to the height of
It is characterized by being defined .

The projections may be formed on a projection supporting plate (for example, the projection supporting plate 14 in FIG. 1) separate from the suspension, or may be formed directly on the suspension (for example, the projection in FIG. 29). The suspension 8A on which the protrusion 16A is formed, or the suspension 8B on which the protrusion 16B of FIG. 34 is formed).

The speed of the head slider in a direction perpendicular to the surface of the disk during loading and / or unloading is 10 mm / sec.
Below, it is preferred that it is 3 mm / sec or more.

According to the present invention, there is provided a disk drive comprising: a suspension having one end fixed to an arm; a flexure disposed near the other end of the suspension to which a head slider is mounted; An inclined table having an inclined surface that increases as one goes to
At the time of loading and unloading, the spherical projection provided on the suspension is engaged with the inclined table so as to protrude toward the disk side, and at the time of loading and unloading, the spherical projection is engaged with the inclined surface. In order to move, at least one of a driving source for moving the arm and at the time of loading and unloading,
Control means for controlling the rotational speed of the disk to a value higher than the minimum flying speed of the head slider and lower than the steady rotational speed.

The data at the leading end of the head slider is
The distance of the head slider from the disk
It is larger than the separation distance of the disk at the tip of the ring.
Angle the flexure head slider mounting surface
You can make it.

The angle of the head slider mounting surface of the flexure is preferably about 0.3 degrees.

[0019]

[0020]

In the first disk device of the present invention, the spherical projection provided at the end of the suspension beyond the flexure mounting position at the time of loading and unloading so as to protrude toward the disk is provided on the inclined platform. Slides with the inclined surface. Since the protrusion is provided at the end of the suspension beyond the flexure mounting position, the force for lifting up the head slider during unloading can be reduced. Further, since the projection is spherical, it comes into contact with the inclined surface in a point-like manner, so that the sliding area is reduced, contamination by sliding is reduced, and the sliding resistance is stabilized.
Further, as described above, since the projection is spherical, the projection comes into contact with the inclined surface in a point-like manner, so that it is not necessary to increase the arrangement accuracy of the inclined table. Further, since the suspension engages with the inclined surface via the spherical protrusion, the roll movement can be performed with respect to the protrusion, so that the attitude of the head slider supported by the suspension can be kept parallel to the disk.

In the first disk drive of the present invention,
Thus, the height of the head slider when the projection of the suspension is located in the recess becomes equal to the flying height when the head slider writes or reads data on or from the disk. Accordingly, the load applied to the suspension during normal operation and during locking (that is, during parking) becomes equal, so that a load loss can be eliminated.

In the disk drive of the present invention, since the head slider mounting surface of the flexure is angled, the leading end of the head slider is always higher than the trailing end during loading and unloading. Also greatly separated from the disk. Therefore, a dynamic pressure is easily generated due to an air film between the slider and the disk surface, so that a floating force is generated when the slider is at a relatively high position. It can be performed.

In the disk device of the present invention, at least one of loading and unloading, the rotation speed of the disk is controlled to a value higher than the flying reproduction speed of the head slider and lower than the steady rotation speed. Within this range, the collision energy can be reduced even if the head slider contacts the disk.

[0024]

FIG. 1 shows the configuration of an embodiment in which the present invention is applied to a magnetic hard disk drive. FIGS. 2 and 3 show one embodiment of a rotary actuator assembly used in the embodiment of FIG. It is the top view and side view which show the example of a structure. The rigid arm 2 of the rotary actuator assembly 1 is manufactured by die casting using, for example, aluminum. One end of a suspension 8 made of, for example, stainless steel is fixed to the mounting area 6 of the rigid arm 2. Flanges 9 are formed in predetermined regions on both sides of the suspension 8. The part of the suspension 8 where the flange 9 is formed,
A portion of the load beam portion where the flange 9 is not formed is an elastic spring portion. A head slider 12 including a magnetic head is attached via a flexure 10 to the magnetic hard disk 40 near the other end of the suspension 8.

The magnetic hard disk 4 of the suspension 8
On the side opposite to the 0 side, a projection supporting plate 14 is fixed. As shown in FIGS. 4 and 5, the projection supporting plate 14 has a spherical projection 16 protruding toward the disk 40 by dimple formation at the tip. The spherical projection 16 is provided at a predetermined position on the center axis of the support plate 14 in the longitudinal direction. The carrier plate 14 is mounted on the suspension 8 such that its central axis in the longitudinal direction coincides with the central axis in the longitudinal direction of the suspension 8 and the spherical projection 16 is located farther from the head slider 12 when viewed from the suspension 8. It is fixed by welding (for example, welding at a position indicated by a broken circle in FIG. 5) or the like.

Rotary actuator assembly 1
The hub portion 4 of the rigid arm 2 is rotatably connected to a fixed shaft 30 via a bearing 32. The portion formed integrally with the hub portion 4 of the rigid arm 2 and extending on the side opposite to the suspension 8 with respect to the fixed shaft 30 includes:
A VCM (voice coil motor) 36 is provided.
The arm 2 is fixed to the fixed shaft 3 by the driving force of the VCM 36.
By rotating about the center axis of 0, the head slider 12 is positioned at a required position of the magnetic hard disk 40.

The inclined table 20 is disposed near the outer periphery of the disk 40, and the inclined surface 24 is separated from the surface of the disk 40 as going outward along the radial direction of the disk 40;
The flat surface 22 is parallel to the surface of the disk 40 following the inclined surface 24, and has a parking recess 26 formed following the flat surface and defining a locked position of the rotary actuator assembly 1. The height of the concave portion 26 of the inclined table 22 is such that the height of the head slider 12 when the projection 16 is
It is set to be equal to the flying height when writing or reading with respect to. Incline table 2
Numeral 0 is supported by a tilt base support member 28, and the tilt base support member 28 is fixed to a housing base (not shown).

FIG. 6 shows a series of states in the loading operation of the embodiment of FIG. First, as shown in FIG. 6A, the projection 16 is located in the concave portion 26 of the inclined base 20 and is in a locked state (that is, the projection 16 is in the stay position). The height of the head slider 12 at this time is equal to the flying height when the head slider 12 writes or reads data on or from the disk 40. Next, as shown in FIG.
6, the rigid arm 2 and the suspension 8 are moved inward of the disk 40, and the protrusion 16 moves from the concave portion 26 to the flat surface 22. At this time, the head slider 1
2 was lifted up from the disk 40 by 200 μm.
It is. As shown in FIG. 6C, when the protrusion 16 reaches the load start position, which is the last position of the flat surface 22, the VCM 36 temporarily stops, and then moves the protrusion 24 along the inclined surface 24. (See FIG. 6D). Next, FIG.
As shown in (e), the VCM 3 is maintained until the head slider 12 starts to receive the air film pressure from the disk 40.
6 holds the projection 16 on the inclined surface 24. When the head slider 12 starts receiving the air film pressure from the disk 40, the VCM 36 moves the protrusion 16 inward in the radial direction of the disk 40 (see FIG. 6F). As a result, the head slider 12 flies and can read / write from / to the disk 40. As described above, FIG.
The height of the head slider 12 with respect to the disk 40 at the stay position shown in FIG.
The height is equal to the height of the head slider 12 that performs the read / write operation with respect to the disk 40 shown in FIG. Therefore,
No load loss occurs.

FIG. 7 shows a series of states in the unloading operation of the embodiment of FIG. First, as shown in FIG. 7A, the VCM 36 moves the suspension 8 (accordingly, the protrusion 16 and the head slider 1) at the standby position in front of the inclined table 20 above the disk 40.
2) Stop. Next, the VCM 36 moves the suspension 8 to the outer periphery of the disk 40, and engages the protrusion 16 with the end of the inclined surface 24, as shown in FIG. 7B. The position at this time is the unload start position. Next, the VCM 36 moves the suspension 8 further to the outer periphery of the disk 40, thereby
Moves on the inclined surface 24 (see FIG. 7 (c)), and further moves on the flat surface 22 (see FIG. 7 (d)).
0 (see FIG. 7E), reaches the concave portion 26 (that is, the stay position), and is locked there (FIG. 7).
(F)). As described above, the height of the head slider 12 at the standby position shown in FIG. 7A (that is, the height of the head slider 12 that reads and writes while floating on the disk 40) is shown in FIG. The head slider 12 at the indicated stay position, that is, the lock position
Is equal to the height of the disk 40. Therefore, no load loss occurs.

FIGS. 8 and 9 are a side view and a bottom view, respectively, showing one configuration example of the suspension, flexure and slider of the embodiment of FIG. 1. FIGS. 10 (a), (b) and (c) FIG. 9 is a side view, a plan view, and a front view showing a detailed configuration of the flexure of FIG. 8. The flexure 10 includes a fixing portion 101 fixed to the suspension 8, a tongue 104 having a longitudinal central axis coinciding with the longitudinal central axis of the suspension 8 and having the head slider 12 attached to a surface on the disk 40 side, From the fixed part 101 to the tongue 104
Flexible outer fingers 108 extending parallel to
And a connecting portion 105 for connecting the tongue portion 104 and the finger 108 via the step portion 106. Due to the presence of the step 106, the tongue 104 is located closer to the disk 40 than the finger 108. On the surface of the tongue 104 opposite to the disk side, a spherical projection 102 forming a load receiving point for receiving a load from the suspension 8 is formed.

On the head slider mounting surface of the flexure 10, that is, the tongue 104, the distance between the leading end LE of the head slider 12 and the disk is larger than the distance between the trailing end TE of the head slider 12 and the disk. , And an angle θp. That is, the tongue 104 has a positive pitch angle θp at the time of attachment with respect to the finger 108. In order to provide such a positive pitch angle θp, an angle θp may be provided on each side of the unevenness of the mold for pressing the step portion 106.

FIGS. 11 (a), 11 (b) and 11 (c) are a side view, a plan view and a front view showing a detailed configuration of a conventional flexure. 11, parts that are the same as or correspond to the flexure of the embodiment of the present invention shown in FIG. 10 are denoted by the same reference numerals followed by “P”. As shown in FIG. 11, in the conventional flexure 10P, the tongue 104P has no angle θp with respect to the finger 108P.

FIG. 12 shows the relationship between the leading end LE and trailing end TE of the slider 12 and the disk surface during loading and unloading in the embodiment of FIG. The mounting height position of the head (that is, the height of the arm mounting area 6) is z, the line parallel to the suspension 8 is bb, the surface of the slider 12, that is, the flat line with the tongue 104 of the flexure is cc, The line indicating the disk surface is d
−d, the angle between the line cc and the line bb is the pitch angle θp, and the angle between the line bb and the line dd, that is, the angle between the suspension 8 and the disk surface is ( θ
z−D), the angle (θp−D) between the surface of the slider 12 and the disk surface is (θp−D) = θp + (θz−D), so that θp + (θz−D)> 0. Height position z
By attaching the suspension 8 to (θp-
D)> 0.

FIG. 13 shows the relationship between the leading end LE and trailing end TE of the slider 12 and the disk surface during loading and unloading in the embodiment of FIG. As described above, θp> 0 and (θp
-D)> 0, the head slider 1 is always loaded and unloaded.
The second leading end LE is farther away from the disc 40 than the trailing end TE. Therefore, a dynamic pressure is easily generated by an air film between the slider 12 and the surface of the disk 40, and a floating force is generated when the slider 12 is at a relatively high position. Loading and unloading can be performed.

FIG. 14 shows the loading and unloading of the output of the AE sensor fixed to the suspension 8 when the angle between the slider mounting surface of the flexure 10 and the suspension 8, that is, the pitch angle θp when the slider is mounted, is changed. It is a graph which shows a change with time. The higher the AE intensity, the higher the collision energy. As is clear from FIG.
It is preferable that the angle of the head slider mounting surface 0, that is, the tongue 104 is about 0.3 degrees.

FIG. 15 shows an example of a configuration of a portion for controlling the mechanical drive section in the embodiment of FIG. This control part comprises a microprocessor 70 and a one-chip drive IC 80
It has. The microprocessor 70 includes a mode controller 71, a spindle sequencer 72, a D / A converter 73, a buffer 74, and an A / D converter 75.
It has. The one-chip drive IC 80 includes a spindle driver 81, an unload power detector 82, a VCM
Driver 83, VCM-BEMF detector 84 and VC
An M speed position detector 85 is provided. The VCM speed position detector 85 corresponds to the speed position detecting device 90 provided for exclusively detecting the position and speed of the VCM 36. The reason for providing the VCM speed position detector 85 and the speed position detection device 90 is to perform ultra-low speed control of the VCM 36.

The mode controller 71 includes a servo signal,
In response to the output signals of the spindle sequencer 72 and the A / D converter 75, the operation mode of the VCM 36 is controlled, and the rotation of the spindle motor 50 for driving the disk 40 is stopped / started and the spindle servo is turned on / off. Control the mode. The spindle sequencer 72 receives the output signal of the mode controller 71 and the feedback signal from the spindle driver 81, selects the rotation speed of the spindle motor 50, and outputs a speed signal indicating the rotation speed.

The spindle driver 81 receives the speed signal from the spindle sequencer 72 and drives the spindle motor 50. In this example, the spindle motor 50
Is a three-phase full-wave sensorless, and is not provided with a position detecting element such as a Hall element. Unload power detector 8
2 rectifies the back electromotive force of the spindle motor 50 when the power is turned off to convert the VCM driver 83 and the speed position detecting device 9
Supply 0.

The D / A converter 73 converts a digital signal output from the mode controller 71 into an analog signal. The buffer 74 is a preamplifier for inputting the output signal of the D / A converter 73 to the VCM driver 83. The driver 83 receives the output signal of the buffer 74 and drives the VCM 36.

The BEMF detector 84 outputs an analog signal indicating the position and speed of the VCM 36 from the reverse emf signal from the coil of the VCM 36 and the output signal of the VCM driver 83. The A / D converter 75 converts an analog signal output from the BEMF detector 84 or the VCM velocity position detector 85 into a digital signal and outputs the digital signal to the mode controller 71.

When data is read / written from / to the disk 40 by the head in the normal use state of the control unit shown in FIG. The VCM 36 is controlled via the VCM driver 83, and the spindle motor 50 is controlled via the mode controller 71, the spindle sequencer 72 and the spindle driver 81.

FIG. 16 shows an example of the disk rotation speed at the time of loading and unloading in the embodiment of FIG. As shown in FIG. 16, the spindle sequencer 7 of FIG.
2 and the spindle driver 81 control the spindle motor 50 so that the rotation speed of the disk 40 is equal to or higher than the minimum flying speed of the head slider 12 and lower than the steady rotation speed during loading and unloading. I do.

FIG. 17 shows the output of the AE sensor fixed to the suspension 8 when the disk 40 is loaded with the rotation speed of the disk 40 being higher than the minimum flying speed of the head slider 12 and lower than the steady rotation speed. FIG. 18 shows an example of the AE sensor fixed to the suspension 8 when the unloading is performed with the rotation speed of the disk 40 being equal to or higher than the minimum flying speed of the head slider 12 and lower than the steady rotation speed. FIG. 19 shows an example of the output, FIG. 19 shows an example of the output of the AE sensor fixed to the suspension 8 when loading is performed with the rotation speed of the disk 40 set to the steady rotation speed, and FIG.
AE fixed to the suspension 8 when unloading is performed with the rotation speed of the disk 40 set to the steady rotation speed
FIG. 21 shows an example of the output of the sensor, and FIG. 21 shows an example of the output of the AE sensor fixed to the suspension when loading is performed by setting the rotation speed of the disk to the steady rotation speed in the first known product. FIG. 23 shows an example of the output of the AE sensor fixed to the suspension when unloading is performed with the disk rotation speed set to the steady rotation speed in the first known product, and FIG. FIG. 24 shows an example of the output of the AE sensor fixed to the suspension when loading is performed with the rotation speed of the disk set to the steady rotation speed. FIG. 5 shows an example of an output of an AE sensor fixed to a suspension when loading is performed. In these figures, VCM
The θ direction means the radial direction of the disk, and the Z direction means the direction perpendicular to the disk surface.

As is clear from FIGS. 17 to 24, when loading and unloading,
When the rotation speed of the head slider 12 is set to a value equal to or higher than the minimum flying speed of the head slider 12 and lower than the steady rotation speed, AE
Because the wave level, that is, the collision energy becomes smaller,
(A) A roll angle or a pitch angle occurs, and the head slider 1
2, the collision energy between the head slider 12 and the disk 40 can be suppressed to a minimum, and (b) even if the posture of the head slider 12 is deteriorated due to component tolerance or assembly tolerance, (C) The collision energy between the head slider 12 and the disk 40 is suppressed to a minimum even if the attitude of the head slider 12 deteriorates due to external vibration or impact. (D) Head slider 12
If the attitude of the head slider 12 does not worsen, the collision energy between the head slider 12 and the disk 40 becomes zero.

FIG. 25 shows that the head pitch angle is +0.135.
゜ shows an example of the output of the AE sensor fixed to the suspension when the head loading speed in the direction perpendicular to the disk surface is changed, and FIG. 26 shows the case where the head pitch angle is -0.235 °. 4 shows an example of the output of the AE sensor fixed to the suspension when the head loading speed in the direction perpendicular to the disk surface is changed. From the experimental results of FIGS. 25 and 26, the recommended range of the head loading speed in the direction perpendicular to the disk surface is 10 m as shown in FIG.
m / sec or less and 3 mm / sec or more. Further, the recommended range of the head unloading speed in the direction perpendicular to the disk surface is also 10 as shown in FIG.
mm / sec or less and 3 mm / sec or more.

FIGS. 29 and 30 are a bottom view and a side view showing the structure of the suspension, flexure and slider in the second embodiment when the present invention is applied to a magnetic hard disk drive. FIG. FIG. 32 is a cross-sectional view of the suspension, flexure, and slider of FIG. 30 taken along the central axis in the longitudinal direction.
FIG. 33 is a cross-sectional view showing the flexure in detail among the cross-sections shown in FIG. 1, and FIG. 33 is a cross-sectional view taken along line BB of FIG. A major difference between the second embodiment shown in these figures and the first embodiment shown in FIGS. 1 to 5 and the like is that, in the second embodiment, the spherical projection 16A protruding toward the disk is provided. The point is that it is formed directly on the suspension 8A, the point that the flexure 10A is a so-called round type, and the point that the flanges 9A formed on both sides of the suspension 8A have folded portions.

The flexure 10A is fixed to the suspension 8A so that θp> 0. Therefore, similarly to the example of FIG. 8, the angle of the surface of the slider 12 attached to the flexure 10A also becomes θp> 0. Slider 12
Can be set to (θp-D)> 0. Therefore, as in the example of FIG.
Loading and unloading can be performed without contact between the disk and the disk. Note that flexure 10
The angle of A with respect to the suspension 8A, that is, the pitch angle θp at the time of mounting the head slider 12, is preferably about 0.3 degrees, as in the example of FIG.

FIGS. 34 and 35 are a bottom view and a side view showing the configuration of a suspension and a flexure in the third embodiment when the present invention is applied to a magnetic hard disk drive. FIG. 36 is a line F of FIG. 37 is a cross-sectional view taken along the line -F, FIG. 37 is a bottom view showing the flexure shown in FIG. 34 in detail, and FIG. 38 is a line G in FIG.
It is sectional drawing which follows -G. In the third embodiment shown in these figures, similarly to the second embodiment shown in FIGS. 29 to 33, the spherical projection 16B protruding toward the disk is formed directly on the suspension 8B, and the flexure 10B is formed. It is a so-called round type. The difference from the second embodiment is that the flange 9B formed on both sides of the suspension 8B does not have a folded portion.

The flexure 10B is fixed to the suspension 8B so that θp> 0, as in the second embodiment. Therefore, the angle of the surface of the slider 12 attached to the flexure 10B also becomes θp> 0. The angle of the flexure 10B with respect to the suspension 8B, that is, the pitch angle θp at the time of mounting the head slider 12 is preferably about 0.3 degrees, as in the second embodiment.

FIG. 39 is a sectional view showing the state of the suspension, flexure and slider at the time of unloading in the third embodiment of the present invention, and FIG.
FIG. 4 is a cross-sectional view illustrating a state of a suspension, a flexure, and a slider at the time of loading in an example. As shown in FIG. 40, since the angle between the surface of the slider 12 and the disk surface can also be set to (θp−D)> 0, loading and unloading are performed without the slider 12 coming into contact with the disk. be able to.

In the above embodiment, the arm for supporting the head is arranged above the magnetic disk. However, the present invention is not limited to this, and the arm is arranged below the magnetic disk. Also applicable to cases.

The present invention can be applied not only to a single magnetic disk but also to a plurality of magnetic disks.

Further, the present invention can be applied not only to a magnetic disk but also to an optical disk and a magneto-optical disk.

According to the first disk drive of the present invention,
A suspension whose end is fixed to the arm and a suspension
The head slider is mounted near the other end of the
The distance between the flexure and the disc
Slopes that increase radially outward and
Provided to keep the head slider stopped at point contact
Inclined platform with recessed recess, loading and unloading
During loading, make sure that the point
At the end of the spence beyond the flexure mounting position
Spherical projection provided to protrude toward the disk
During loading and unloading
To move the arm to engage the
And a head slide when the projection is located in the recess.
The height of the slider indicates that the head slider
Head slider height when scanning or reading
The height of the recess of the inclined table is determined so that
So was like being, it is possible to reduce the force to lift up the head slider at the time of unloading. Also, since the protrusions are spherical, they come into point contact with the inclined surface,
The sliding area is reduced, the contamination due to sliding is reduced, and the sliding resistance is stabilized. Further, since the projections come into contact with the inclined surface in a point-like manner, it is not necessary to increase the arrangement accuracy of the inclined table. Further, since the suspension engages with the inclined surface via the spherical protrusion, the roll movement can be performed with respect to the protrusion, so that the attitude of the head slider supported by the suspension can be kept parallel to the disk.

Further , according to the first disk device of the present invention,
For example, the height of the head slider when the projection of the suspension is located in the concave portion is equal to the flying height when the head slider writes or reads data on or from the disk. Accordingly, the load applied to the suspension during normal operation and during locking (that is, during parking) becomes equal, so that a load loss can be eliminated.

According to the disk drive of the present invention , the suspension having one end fixed to the arm, the flexure disposed near the other end of the suspension and having the head slider mounted thereon, and the distance between the disk and the disk in the radial direction of the disk A sloping surface having a sloping surface that becomes larger toward the outside of the disk, a spherical protrusion provided on the suspension so as to be engaged with the sloping plate during loading and unloading and to protrude toward the disk, At the time of loading, the drive source for moving the arm to engage the spherical projection on the inclined surface and move it, and at least one of loading and unloading, when the rotation speed of the disk is higher than the minimum flying speed of the head slider So that it is controlled to a value smaller than the steady speed In, even if it contacts the head slider and the disk can be reduced collision energy.

According to the disk drive of the present invention, the heads
Separation distance of the leading edge of the rider from the disc
To the disk at the trailing end of the head slider.
Flexure head so that it is greater than the separation distance
Since the slider mounting surface is angled, when loading
When loading and unloading, always
The leading end of the rider is closer than the trailing end
The slider and the disk are so far apart from the disk
Without contact, loading and unloading
It can be performed. Even if they touch
The slider and the desk disk are less damaged, causing damage
It is hard to produce.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a first embodiment when the present invention is applied to a magnetic hard disk drive.

FIG. 2 is a plan view showing a configuration example of a rotary actuator assembly used in the embodiment of FIG.

FIG. 3 is a side view showing one configuration example of a rotary actuator assembly used in the embodiment of FIG. 1;

FIG. 4 is an enlarged side view showing a projection supporting plate of the rotary actuator assembly shown in FIG. 3;

FIG. 5 is an enlarged plan view showing a projection supporting plate of the rotary actuator assembly shown in FIG. 2;

FIG. 6 is a side view showing a series of states in the loading operation of the embodiment of FIG. 1;

FIG. 7 is a side view showing a series of states in the unloading operation of the embodiment of FIG. 1;

FIG. 8 is a side view showing a configuration example of the suspension, flexure and slider of the embodiment of FIG.

FIG. 9 is a bottom view showing one configuration example of the suspension, flexure and slider of the embodiment of FIG. 1;

FIG. 10 is a side view showing a detailed configuration of the flexure of FIG. 8,
It is a top view and a front view.

FIG. 11 is a side view showing a detailed configuration of a conventional flexure,
It is a top view and a front view.

FIG. 12 is a bottom view showing an angle relationship among a suspension, a flexure, a slider and a disk surface of the embodiment of FIG. 1;

FIG. 13 is a side view showing the relationship between the leading end and trailing end of the slider and the disk surface during loading and unloading in the embodiment of FIG. 1;

FIG. 14 is a graph showing a change in the output of the AE sensor fixed to the suspension 8 when the angle between the slider mounting surface of the flexure and the suspension, that is, the pitch angle θp at the time of mounting the slider, is changed.

FIG. 15 is a block diagram illustrating an example of a configuration of a control unit in the embodiment of FIG.

FIG. 16 is a graph showing an example of a disk rotation speed at the time of loading and at the time of unloading in the embodiment of FIG. 1;

FIG. 17 is a graph showing an example of an output of an AE sensor fixed to a suspension when loading is performed by setting the rotation speed of the disk to a value equal to or higher than the minimum flying speed of the head slider and smaller than the steady rotation speed. .

FIG. 18 is a graph showing an example of an output of an AE sensor fixed to a suspension when unloading is performed by setting the rotational speed of the disk to a value equal to or higher than the minimum flying speed of the head slider and smaller than the steady rotational speed. is there.

FIG. 19 shows an AE fixed to a suspension when loading is performed with the disk rotation speed set to a steady rotation speed.
5 is a graph illustrating an example of an output of a sensor.

FIG. 20 is a graph showing an example of the output of the AE sensor fixed to the suspension when unloading is performed with the disk rotation speed set to the steady rotation speed.

FIG. 21 is a graph showing an example of the output of the AE sensor fixed to the suspension when loading is performed with the disk rotation speed set to the steady rotation speed in the first known product.

FIG. 22 is a graph showing an example of an output of an AE sensor fixed to a suspension when unloading is performed with the disk rotation speed set to a steady rotation speed in the first known product.

FIG. 23 is a graph showing an example of an output of an AE sensor fixed to a suspension when loading is performed with a disk rotation speed being a steady rotation speed in a second known product.

FIG. 24 is a graph showing an example of an output of an AE sensor fixed to a suspension when unloading is performed with the disk rotation speed set to a steady rotation speed in a second known product.

FIG. 25 shows an AE fixed to a suspension when a head pitch angle is set to + 0.135 ° and a head loading speed in a direction perpendicular to a disk surface is changed.
5 is a graph illustrating an example of an output of a sensor.

FIG. 26 shows an AE fixed to a suspension when a head pitch angle is set to −0.235 ° and a head loading speed in a direction perpendicular to a disk surface is changed.
5 is a graph illustrating an example of an output of a sensor.

FIG. 27 is a graph showing a recommended range of a head loading speed in a direction perpendicular to the disk surface.

FIG. 28 is a graph showing a recommended range of a head unloading speed in a direction perpendicular to a disk surface.

FIG. 29 is a bottom view showing a configuration of a suspension, a flexure, and a slider in a second embodiment when the present invention is applied to a magnetic hard disk drive.

FIG. 30 is a side view showing a configuration of a suspension, a flexure, and a slider in a second embodiment when the present invention is applied to a magnetic hard disk drive.

FIG. 31 is a cross-sectional view of the suspension, flexure, and slider shown in FIGS. 29 and 30 along the central axis in the longitudinal direction.

32 is a cross-sectional view showing a flexure in detail of the cross section shown in FIG. 31;

FIG. 33 is a sectional view taken along line BB in FIG. 29;

FIG. 34 is a bottom view showing a configuration of a suspension and a flexure in a third embodiment when the present invention is applied to a magnetic hard disk drive.

FIG. 35 is a side view showing a configuration of a suspension and a flexure in a third embodiment when the present invention is applied to a magnetic hard disk drive.

FIG. 36 is a cross-sectional view of FIG. 34 taken along the line FF.

FIG. 37 is a bottom view showing the flexure shown in FIG. 34 in detail.

FIG. 38 is a cross-sectional view of FIG. 37 taken along the line GG.

FIG. 39 is a sectional view showing a state of a suspension, a flexure, and a slider at the time of unloading in a third embodiment of the present invention.

FIG. 40 is a cross-sectional view showing a state of a suspension, a flexure, and a slider at the time of loading in a third embodiment of the present invention.

FIG. 41 is a side view showing the relationship between the leading end and trailing end of the slider and the disk surface during conventional loading and unloading.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary actuator assembly 2 Rigid arm 8, 8A, 8B Suspension 10, 10A, 10B Flexure 12 Head slider 14 Projection support plate 16, 16A, 16B Spherical projection 20 Inclined table 22 Flat surface 24 Inclined surface 26 Concave portion 36 Voice coil Motor 50 Spindle motor

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-95783 (JP, A) JP-A-3-122879 (JP, A) JP-A-4-17173 (JP, A) JP-A-4-199 162270 (JP, A) JP-A-4-241279 (JP, A) JP-A-4-89675 (JP, A) JP-A-4-258856 (JP, A) JP-A-3-503101 (JP, A) WO 92/11630 (WO, A1) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 21/12

Claims (2)

(57) [Claims] 1. A disk drive for positioning a head slider at a required position on a disk by moving an arm supporting a head slider, a suspension having one end fixed to the arm, and a suspension arranged near the other end of the suspension. A flexure to which the head slider is attached, an inclined surface whose distance from the disk increases toward the outside in the radial direction of the disk, and a concave portion provided to stop the head slider at point contact. And a spherical surface provided so as to protrude toward the disk at an end of the suspension beyond the flexure mounting position so as to engage with the inclined table in point contact during loading and unloading. Shape projection, loading and unloading A drive source for moving the arm in order to move the projection by engaging the projection with the inclined surface, wherein the height of the head slider when the projection is located in the recess is such that the head slider is mounted on the disk. A height of a concave portion of the inclined base is set so as to be equal to a height of a head slider when writing or reading data to or from the disk drive. 2. The speed of the head slider in a direction perpendicular to the surface of the disk during at least one of the loading and the unloading is set to 1
2. The disk device according to claim 1, wherein the distance is 0 mm / sec or less and 3 mm / sec or more.