JPH05334831A - Floating type magnetic head device - Google Patents

Abstract

PURPOSE:To control a floating amt. of a magnetic head from a medium to be constant by changing the posture of a slider to be inclined in the radial direction of the medium by a rotary angle of the slider. CONSTITUTION:A slider rail 3 is projectively formed on the slider 1 of a ceramic from an air inflow end 1b over to an outflow end 1c. The rail 3 is composed of a rectangular part 3b and V-shaped bending parts 3c1 and 3c2. When the slider 1 is inclined to negative at a skew angle theta to be operated the innermost circumference of a discoid recording medium, the boot part 3c1 is parallel to circumferential speed vectors B1 and B2, i.e., the running direction of a recording track, and when the slider is operated in the outermost circumference, the foot part 3c2 is parallel instead. Moreover, a gap of the magnetic head 2 is disposed to face an opposite surface 1a at the air outflow end 1c, and when the slider is floated, the gap is orthogonal to the recording track. When information is recorded/reproduced by using this device, the floating posture of the slider 1 in the radial direction of the medium is changed by the skew angle theta, and the floating amt. of the head is controlled by this inclination. By this method, the floating amt. of the head 2 is operated to be constant over the whole region of a signal recording area.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating magnetic head device used in a hard disk drive device or the like.

[0002]

2. Description of the Related Art Generally, information signals are recorded / recorded in a magnetic disk drive device such as a hard disk drive device.
The levitation type magnetic head device for reproducing uses a static pressure (levitation force) on the surface facing the disc-shaped magnetic recording medium by the air flow in order to levitate using the air flow generated on the surface of the disc-shaped magnetic recording medium such as a hard disk. ) Is formed of a base body provided with an air bearing surface, that is, a so-called slider, and a magnetic head element disposed with a magnetic gap facing the surface of the slider facing the disk-shaped magnetic recording medium. There is.

Then, as shown in FIG. 10, the slider 11 described above is attached to a rotary actuator (not shown) which is a drive section via a suspension (not shown), and a disk-shaped magnetic recording medium 17 is formed. While levitating by receiving the air flow generated by rotating at high speed, drawing an arcuate locus on the signal recording area 17a of the disk-shaped magnetic recording medium 17 starting from the rotation axis O of the rotary actuator described above. Move in the radial direction. At this time, the slider 11 has an angle θ (hereinafter, referred to as an “angle between the longitudinal direction of the slider 11 and the advancing direction of the air flow”).
This is called the skew angle θ. ), And floats above the disk-shaped magnetic recording medium 17.

[0004]

By the way, the slider 1
On the surface 11a facing the disk-shaped magnetic recording medium 17 of No. 1, the slider 11 as shown in FIGS.
From the air inflow end 11b to the air outflow end 1 along the longitudinal direction of
Air bearing surface 14 described above for 1c
The slider rails 14 and 15 provided with a and 15a are formed to project, and the air inflow groove 13 is also provided at a substantially central position of the slider rails 14 and 15 along the longitudinal direction of the slider 11 with a predetermined depth. Are formed. It should be noted that the positions where the black frame magnetic head elements 12 are formed in FIGS. 11 to 13 are shown.

Therefore, when the slider 11 is located on the inner or outer peripheral side of the signal recording area 17a of the disk-shaped magnetic recording medium 17, the direction of the slider 11 is the same as the longitudinal direction of the slider 11, that is, the forming direction of the slider rails 14 and 15. The airflow is displaced by a skew angle θ, and the flying position of the magnetic head element 12 is, for example, as shown in FIG.
As shown in FIG. 4, the signal recording area 17a of the disk-shaped magnetic recording medium 17 greatly changes from the innermost circumference to the outermost circumference.

That is, as shown in FIG. 10, when the slider 11 is positioned at the innermost circumference of the signal recording area 17a of the disk-shaped magnetic recording medium 17 with the skew angle .theta. The rotating peripheral speed of the medium 17 is not so fast, and the slider 11 is not
Since the robot is flying at a skew angle θ with respect to the airflow entering direction indicated by the middle arrow A, only a low flying height can be obtained. Further, as shown in FIG. 10, when the slider 11 positively swings the skew angle θ from the innermost circumference of the above-mentioned signal recording area 17a and becomes the skew angle θ of zero degree, the slider rails 14 and 15 are formed in the forming direction. Since the air flow entering direction indicated by the arrow A in FIG. 12 substantially coincides with the air flow, the air flow is efficiently converted into static pressure on the air bearing surfaces 14a and 15a, and the maximum flying height is obtained. Further, in FIG.
When the slider 11 is positioned at the outermost circumference of the signal recording area 17a by swinging the skew angle θ positively as shown by 0, the peripheral speed at which the disk-shaped magnetic recording medium 17 rotates becomes faster, but the slider 11 still moves. Since it is inclined by the skew angle θ with respect to the air flow entering direction shown by the arrow A in FIG. 13, only a low flying height can be obtained.

As described above, if the flying height of the slider greatly changes from the inner circumference to the outer circumference of the disk-shaped magnetic recording medium, the output varies during recording / reproduction of the information signal, which is disadvantageous in achieving high density recording. Further, today, so-called zone bit recording is performed in which the frequency is increased from the inner circumference to the outer circumference of the disk-shaped magnetic recording medium in order to increase the recording density. In this case, since the signal recording area is divided into several zones and recording is performed at the same recording density, it is desirable that the flying height of the slider is constant over the entire signal recording area. The zone bit recording cannot be made effective because it changes greatly from the inner circumference to the outer circumference of the disk-shaped magnetic recording medium.

Therefore, the present invention has been proposed to solve the above-mentioned problems of the prior art, and makes the flying height of the slider constant over the entire signal recording area of the disk-shaped magnetic recording medium. At the same time, it is an object of the present invention to provide a flying type magnetic head device which is expected to improve output characteristics and reduce power consumption when recording / reproducing information.

[0009]

To achieve the above object, in a flying magnetic head device according to the present invention, a slider is run in the circumferential direction of a disk-shaped magnetic recording medium, and a magnetic head element is run by the slider. In a flying magnetic head device, the slider is arranged at a position deviated to one of the rear end surfaces in the radial direction of the medium, and the slider is rotationally scanned in the radial direction of the medium by a rotary actuator. By changing the attitude in the medium radial direction and tilting the slider in the medium radial direction, the flying height of the magnetic head element from the disk-shaped magnetic recording medium is controlled.

Further, the rail formed on the slider is non-parallel.

[0011]

In the flying magnetic head device according to the present invention, the attitude of the slider in the medium radial direction is changed by the rotation angle of the slider, and the inclination of the slider in the medium radial direction causes the magnetic head element to move from the disk-shaped magnetic recording medium. The flying height of the slider is controlled in the radial direction over the entire signal recording area of the disk-shaped magnetic recording medium regardless of the skew angle θ of the slider and the change in the peripheral speed of the disk-shaped magnetic recording medium. Is constant, and so-called constant flying height characteristics are achieved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described in detail below with reference to the drawings. The flying type magnetic head device of this embodiment includes a slider 1 and a magnetic head element 2.
It consists of and. 1 to 6 show the direction of entry of the air flow and the magnetic field when the floating magnetic head device of the present embodiment is operated on the disk-shaped magnetic recording medium with the skew angle θ swung from positive to negative and then positive. The flying position of the head element 2 is shown. The magnetic head element 2 is shown by a black frame at the rear end in the traveling direction of the slider 1 in FIGS. 1 to 6.

The slider 1 is made of, for example, a non-magnetic material such as ceramics, and is formed as a rectangular parallelepiped having a plane rectangular shape. On one main surface 1a of the slider 1 facing a disk-shaped magnetic recording medium, a so-called hard disk, the slider 1 is levitated with a minute gap from the hard disk by receiving an air flow, and the rotation angle of the slider 1 is increased. That is, the slider rail 3 for changing the attitude of the slider with respect to the traveling direction in accordance with the skew angle θ is formed from the air inflow end 1b to the air outflow end 1 of the slider 1.
It is formed to project over c.

The slider rail 3 described above extends from the vicinity of the air inflow end 1b of the slider 1 to a midway portion thereof.
A planar rectangular extending portion 3b having a width substantially equal to the entire width of
Further, the bent portion 3c having a substantially V-shaped plane is formed from the rear end of the extending portion 3b in the traveling direction to the vicinity of the air outflow end 1c. The bent portion 3c described above is formed by abutting the V-shaped steeple portion thereof on the substantially central portion of the rear end surface in the traveling direction of the extending portion 3b described above. the towards the right end portion of the slider 1 of the trailing edge 1c, and the other respective leg 3c ₁ of flat, substantially rectangular shape having a predetermined width toward the left end portion of the trailing edge 1c of the slider 1, 3c ₂ is formed. The slider rail 3 including the extended portion 3b and the bent portion 3c is also included.
Of the entire surface 3a facing the disk-shaped magnetic recording medium of
It is used as a bearing surface and is ground to have a smooth surface.

Further, the leg portions 3c ₁ of the bent portion 3c described above,
3c ₂ is formed at a predetermined angle with respect to the longitudinal direction of the slider 1. For example, the slider 1 has a skew angle θ.
Is operated to the innermost circumference of the disk-shaped magnetic recording medium by swinging negatively, the leg portion 3c ₁ moves its circumferential velocity vector B ₁ ,
B ₂ , that is, the leg portion 3c ₂ is formed so as to be formed substantially parallel to the traveling direction of the recording track of the disk-shaped magnetic recording medium described above, and when the slider 1 is operated to the outermost periphery of the disk-shaped magnetic recording medium. It is formed so as to be substantially parallel to the running direction of the recording track of the disk-shaped magnetic recording medium.

Further, at the trailing end of the slider 1 in the running direction, that is, at the air outflow end 1c, the magnetic head element 2 has its magnetic gap facing the disk-shaped magnetic recording medium 1a.
When the slider 1 floats, the above-mentioned magnetic gap is substantially orthogonal to the recording track of the disk-shaped magnetic recording medium. In the magnetic head element 2, a bulk head formed by abutting a pair of magnetic cores, an MIG head, or the like, and the above-described magnetic gap composed of a lower core and an upper core, have a low inductance, a high magnetic permeability and a high magnetic permeability even in a high frequency band. A thin film magnetic head capable of obtaining a saturation magnetic flux density is used. As described above, in this embodiment, the magnetic head element 2 is not shown in FIG.
Only the position is shown in the middle black frame.

When the floating magnetic head device of the present embodiment as described above is mounted on a magnetic disk drive device to record / reproduce information signals, the slider 1 causes the disk angle of the disk-shaped magnetic recording medium to vary depending on the skew angle θ. The slider 1 in the medium radial direction by changing the flying posture in the direction
The flying height of the magnetic head element 2 from the disk-shaped magnetic recording medium is controlled by the inclination of the magnetic head element 2 so that the magnetic head element 2 is operated with a constant flying height over the entire signal recording area of the disk-shaped magnetic recording medium. It

That is, when the slider 1 is operated to the innermost position of the signal recording area of the disk-shaped magnetic recording medium with the skew angle θ being negatively generated, it is generated on the surface of the disk-shaped magnetic recording medium. The air flow is indicated by the arrow B in FIG.
_As indicated by ₁ and B ₂ , the slider 1 enters the rear end 1c in the traveling direction obliquely to the right. Here, one leg portion 3c ₁ of the slider rail 3 is substantially parallel to the above-described airflow approaching direction B _1, and the other leg portion 3c ₂ crosses the airflow approaching direction B ₂ , so that each leg is Positive pressure p ₁ generated in the portions 3c ₁ and 3c ₂ ,
The p _2, p _1> p ₂ the relationship is established. As a result, the slider 1 tilts upward to the right in the radial direction of the medium as shown in FIG. 2, and the magnetic head element 2 shown by a black frame in FIG.
Raise the floating position of. In addition, the arrows B ₁ and B in FIG.
Positive pressure p ₁ of the length of ₂ is on each leg 3c _1, 3c _2, p ₂
Shows the relationship.

Further, when the slider 1 is operated in a substantially central portion of the positive shake signal recording area described above the skew angle θ, the air flow as shown in FIG. 3 in an arrow B _1, B ₂ slider The slider 1 enters the rear end 1c in the traveling direction substantially parallel to the longitudinal direction of the slider 1. At this time, all of the legs 3c ₁ and 3c ₂ of the slider rail 3 are in a shape crossing the above-mentioned air flow entering direction, and the positive pressure effect on the air bearing surface 1a of the slider 1 is somewhat suppressed. Therefore, each leg 3
The positive pressures p ₁ and p ₂ generated on c ₁ and 3c ₂ are substantially equal (p ₁ = p ₂ ), and as shown in FIG. 4, the positive pressures p ₁ and p ₂ float substantially parallel to the surface direction of the disk-shaped magnetic recording medium. Will be done.

Further, the slider 1 further has a skew angle θ.
When the slider is operated to the outermost peripheral position of the signal recording area by swinging positively, the airflow obliquely enters the rear end 1c of the slider 1 in the traveling direction as indicated by arrows B ₁ and B ₂ in FIG. To do. Here, one leg portion 3c ₁ of the slider rail 3 crosses the above-described air flow entering direction, but the other leg portion 3c ₁
Since c ₂ is substantially parallel to the air flow entrance direction, each leg 3
For positive pressures p ₁ and p ₂ generated in c ₁ and 3c ₂ , p ₁ <p
_{2, the} slider 1 tilts downward to the right with respect to the medium radial direction as shown in FIG. 6 to lower the flying position of the magnetic head element 2 shown by the black frame in FIG.

Therefore, the slider 1 has a skew angle θ.
Thus, the radial attitude of the disk-shaped magnetic recording medium is changed by the difference in positive pressure generated between the right side region and the left side region of the slider 1 in the traveling direction, and the inclination of the slider in the medium radial direction (that is, the slider 1 When the skew angle θ is swung negatively, the flying position of the magnetic head element 2 is high, and when the skew angle θ is swung positively, the flying position of the magnetic head element 2 is low.) The flying height from the recording medium is controlled, and the flying position of the magnetic head element 2 becomes constant over the entire signal recording area as shown in FIG. 7, for example.

As shown in FIGS. 1, 3, and 5, the leg portions 3c ₁ and 3c _{2 of the} bent portion 3c are formed so as not to be parallel to each other, and in the present embodiment, the slider 1 is formed. The shape of the legs 3c ₁ and 3c is substantially symmetrical with respect to the longitudinal direction of the legs, depending on, for example, the skew angle θ and the disk peripheral speed of the disk-shaped magnetic recording medium.
_{The two} may be non-parallel to each other, and one leg portion 3c ₁ may be formed wider than the other leg portion 3c ₂ . That is, when the slider 1 is operated at the outermost position of the signal recording area of the disk-shaped magnetic recording medium with the skew angle θ positively moved, the magnetic head is high because the peripheral speed of the disk-shaped magnetic recording medium is high, for example. It is used when the flying position of the element 2 becomes high. That is, each leg 3c ₁ , 3c
₂ , the relationship between the positive pressures p ₁ and p ₂ (p ₁ <p ₂ ) is further strengthened to increase the inclination of the slider 1 shown in FIG. 2 to further lower the flying position of the magnetic head element 2. It is a thing.

Although one embodiment of the present invention has been described above, various modifications can be made without departing from the spirit of the present invention. For example, the following structure may be employed.

That is, as shown in FIG. 9, as in the conventional flying type magnetic head device, the air inflow end 1 of the slider 1 is provided on the surface 1a of the slider 1 facing the disk-shaped magnetic recording medium.
Slider rails 4 and 5 each having a flat rectangular shape inclined rightward with respect to the longitudinal direction of the slider 1 from b to the air outflow end 1c.
Are formed so as to project. Of course, the surfaces of the slider rails 4 and 5 facing the disk-shaped magnetic recording medium are air bearing surfaces 4a and 5a, which are ground to be smooth surfaces. Air inflow grooves 7 having a predetermined depth are formed along the formation directions of 4 and 5. Further, the slider 1 has a slider rail 6 having a planar triangular shape on the outer side of the slider rail 5 described above. That is, the slider rail 6 moves from the midway portion of the slider 1 to the air outflow end 1
It is formed in a triangular shape from the air outflow end 1c side in the vicinity of c.

As a result, similar to the effect of the slider 1 shown in FIG. 3, when the slider 1 is operated to the outermost peripheral position of the signal recording area, for example, the peripheral speed of the disk-shaped magnetic recording medium described above is high. Therefore, when the flying position of the magnetic head element 2 becomes high, the relationship (p ₁ <p ₂ ) between the positive pressures p ₁ and p ₂ that is established by the slider rails 4 and the slider rails 5 and 6 is further strengthened. The flying position of the magnetic head element 2 can be further lowered by increasing the inclination of the slider 1 shown in FIG.

As a result, as described above, the slider 5 changes the inclination posture of the disk-shaped magnetic recording medium in the radial direction by the skew angle θ, and the flying height of the magnetic head element from the disk-shaped magnetic recording medium is controlled. , Can be kept constant over the entire signal recording area.

[0027]

As is apparent from the above description, according to the present invention, the slider is moved in the circumferential direction of the disk-shaped magnetic recording medium, and the magnetic head element is moved in the medium radial direction of the rear end surface in the running direction of the slider. In a flying magnetic head device, which is arranged at a position deviated to either one, and in which the slider is rotationally scanned in the medium radial direction by a rotary actuator, the attitude of the slider in the medium radial direction is changed depending on the rotation angle of the slider. At the very least, since the flying height of the magnetic head element from the disk-shaped magnetic recording medium is controlled by the inclination of the slider in the medium radial direction,
The flying height of the slider is equalized over the entire signal recording area regardless of the skew angle of the slider and the change in peripheral speed of the disk-shaped magnetic recording medium.

Further, since the rails formed on the slider are non-parallel, the above-mentioned constant flying effect of the slider is improved. The floating magnetic head device described above can be applied to, for example, a magnetic disk drive device for zone bit recording to obtain useful effects.

[Brief description of drawings]

FIG. 1 is a diagram showing an air flow on a surface of a slider facing a disk-shaped magnetic recording medium when the flying magnetic head device according to the present invention is operated toward the inner peripheral side of the disk-shaped magnetic recording medium with a negative skew angle θ. It is a front view which shows the state which progresses normally.

FIG. 2 is a side view schematically showing the flying position of the magnetic head element 2 when the flying magnetic head device according to the present invention is operated to the inner peripheral side of the disk-shaped magnetic recording medium with a negative skew angle θ. It is a figure.

FIG. 3 is a diagram showing an airflow that travels on the surface of the slider facing the disk-shaped magnetic recording medium when the flying magnetic head device according to the present invention is operated to an intermediate position of the disk-shaped magnetic recording medium having a skew angle θ of zero degrees. It is a front view which shows a state typically.

FIG. 4 is a side view schematically showing the flying position of the magnetic head element 2 when the flying magnetic head device according to the present invention is operated to an intermediate position of a disk-shaped magnetic recording medium having a skew angle θ of zero degrees. ..

FIG. 5 is a diagram illustrating an air flow on the surface of the slider facing the disk-shaped magnetic recording medium when the flying magnetic head device according to the present invention is operated toward the inner peripheral side of the disk-shaped magnetic recording medium with a positive skew angle θ. It is a front view which shows the state which progresses normally.

FIG. 6 is a side view schematically showing the flying position of the magnetic head element 2 when the flying magnetic head device according to the present invention is operated toward the inner peripheral side of the disk-shaped magnetic recording medium with a positive skew angle θ. It is a figure.

FIG. 7 is a characteristic diagram showing changes in the flying height of a slider when a disk-shaped magnetic recording medium is accessed by a flying magnetic head device according to the present invention.

FIG. 8 is a front view schematically showing another embodiment of the floating magnetic head device according to the present invention.

FIG. 9 is a front view schematically showing still another embodiment of the floating magnetic head device according to the present invention.

FIG. 10 is a plan view schematically showing a state where a disk-shaped magnetic recording medium is accessed by a conventional floating magnetic head device.

FIG. 11 shows a skew angle θ in a conventional floating magnetic head device.
FIG. 7 is a front view schematically showing a state where an air flow advances on the surface of the slider facing the disk-shaped magnetic recording medium when the slider is operated to the inner peripheral side by swinging the disk negatively.

FIG. 12 shows a skew angle θ in a conventional floating magnetic head device.
FIG. 7 is a front view schematically showing a state where an air flow advances on the surface of the slider facing the disk-shaped magnetic recording medium when is operated to an intermediate position of the disk-shaped magnetic recording medium at zero degrees.

FIG. 13 shows a skew angle θ in the conventional floating magnetic head device.
FIG. 4 is a front view schematically showing a state in which an airflow advances on a surface of the slider facing the disk-shaped magnetic recording medium when the disk is swung to the inner peripheral side of the disk-shaped magnetic recording medium.

FIG. 14 is a characteristic diagram showing changes in the flying height of a slider when a disk-shaped magnetic recording medium is accessed by a conventional floating magnetic head device.

[Explanation of symbols]

 1 ... slider 2 ... magnetic head element 3, 4, 5, 6 ... slider rail

Claims (2)

[Claims] 1. A slider travels in the circumferential direction of a disk-shaped magnetic recording medium, a magnetic head element is arranged at a position offset to one of the rear end surfaces of the slider in the radial direction of the medium, and the slider is In a floating magnetic head device that is rotationally scanned in the radial direction of a medium by a rotary actuator, the attitude of the slider in the radial direction of the medium is changed by the rotation angle of the slider, and the inclination of the slider in the radial direction of the medium causes the disk of the magnetic head element -Type magnetic head device that controls the flying height from a magnetic recording medium. 2. The flying magnetic head device according to claim 1, wherein the rails formed on the slider are non-parallel.