JP2887192B2 - Levitated magnetic head device - Google Patents

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 mounted on a hard disk drive or the like, and more particularly to a floating magnetic head device mounted with a center line of a head body inclined with respect to a center line of a support member. About.

[0002]

2. Description of the Related Art FIG. 7 is a plan view for explaining the operating functions of a floating magnetic head device used for a hard disk device or the like. In this type of floating magnetic head device, a slider 2 is provided on a head body 1, and flat rail surfaces 2a and 2b are formed on a surface of the slider 2 facing the disk. When the rotation direction of the disk D is the counterclockwise direction (A direction), (a) of the head main body 1 is the leading side, and (b) is the trailing side. In the example shown in FIG. 7, a core 3 on which a coil is wound is attached to the center position of the trailing end of the slider 2, and a magnetic gap G is formed on the surface facing the disk D.

The head body 1 is supported at the tip of a support member 4. FIG. 7 shows only the center line O4 of the support member 4. The head main body 1 is attached to a leaf spring portion (flexure) of the support member 4 with a degree of freedom. The flexure is provided with a pivot 5 located on the center line O4, and the head main body 1 can move around the pivot 5 as a fulcrum. In a hard disk drive or the like, when the disk D rotates in the direction A, the rail surfaces 2a and 2b of the slider 2
The head body 1 is brought into a floating posture by the air flow between the head and the surface of the disk D. Further, the support member 4 rotates in the θ direction about an axis located below the disk D in the drawing, whereby the head main body 1 moves between the inner peripheral side and the outer peripheral side of the disk.

In the conventional floating magnetic head device, the center line O1 of the head main body 1 coincides with the center line O4 of the support member 4, so that the rail surfaces 2a and 2b of the slider 2 are always at the center line of the support member 4. It was parallel to O4. Therefore, when the head main body 1 moves to the outer peripheral side of the disk D, the angle formed between the rail surfaces 2a and 2b and the disk tangential direction (Y direction) increases. As a result, the airflow on the disk surface rotating in the direction A hits the rail surfaces 2a and 2b obliquely, so that the flying height of the head body 1 that has moved to the outer peripheral side decreases, and from the inner peripheral side to the outer peripheral side. There is a problem that the fluctuation of the flying height of the head body 1 when moving is large. Therefore, as shown in FIG. 7, the center line O1 of the head main body 1 is inclined counterclockwise with respect to the center line O4 of the support member 4 to give a skew angle α. As a result, the angle between the rail surfaces 2a and 2b of the head body 1 moved to the outer peripheral side and the tangential direction (Y direction) of the disk becomes shallower, and a decrease in the flying height of the head body 1 moved to the outer peripheral side can be prevented. Become like

[0005]

In the conventional example shown in FIG. 7, when the skew angle α is given to the head body 1,
Are tilted counterclockwise about the pivot 5. As a result, the magnetic gap G located at the center of the trailing side end of the slider 2 is displaced by δ toward the inner peripheral side with respect to the center line O4 of the support member 4. Therefore, when a track access or the like is performed by rotating the support member 4 in the θ direction, the position of the magnetic gap G is calculated by performing a calculation in consideration of the position shift of δ to the rotation angle θ of the support member 4. It must be. In addition, in order to accurately calculate the amount of displacement between the magnetic gap G and the center line O4 in the disk radial direction (X direction), a component of the rotation angle θ of the center line O4 is further added to the amount of displacement δ. Therefore, highly accurate control of the movement position of the magnetic gap G becomes more complicated. In particular, when performing track access to the disk D on which high density recording is performed in a short time,
The displacement of the position of the magnetic gap G with respect to the center line O4 can cause a delay in the control operation.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and provides a floating magnetic head device capable of eliminating a drawback when a skew angle is given to a head main body with respect to a center line of a support member. It is intended to be.

[0007]

According to the present invention, a head body supported by a support member is opposed to a rotating recording medium in a floating posture, and the head body is rotated on the inner peripheral side of the recording medium by a rotating operation of the support member. In the floating magnetic head device that moves between the outer peripheral side and the head body, the center line of the head main body is inclined with respect to the center line of the support member so that the trailing side end is closer to the inner peripheral side, In addition, the head body is mounted in a state where the center portion of the head body is offset from the center line of the support member toward the outer peripheral side.

In the above, when the magnetic recording or reproducing function unit is provided at the center position of the trailing end of the head main body, it is possible to make the function unit substantially coincide with the center line of the support member. .

[0009]

In the above means, the head body is mounted with a skew angle with respect to the center line of the support member, and the head body is mounted with the center position shifted with respect to the support member. Therefore, when the magnetic recording or reproducing function unit is provided at the center of the trailing side end of the head body, the amount of misalignment between the function unit and the center line of the support member due to the skew angle can be reduced, and the function unit is reduced. It is also possible to make them substantially coincide with the center line of the support member.

Further, if the head body is attached to the supporting member so as to be shifted from the center position, when the head body moves between the inner peripheral side and the outer peripheral side of the recording medium, the recording medium of the head main body is moved. The amount of inclination (roll inclination) in the radial direction can be suppressed. Therefore, when the head body is operated at a low flying height, it is possible to prevent the edge of the head body from contacting the recording medium due to the roll inclination, and the magnetic recording or reproducing function section is provided at the edge of the trailing side end of the head body. In this case, it is possible to suppress a variation in the floating amount of the functional unit due to the roll posture.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a plan view showing a floating disk device as one embodiment of the present invention, and FIG. 2 is a side view thereof. In the floating magnetic head device shown in FIG. 1, the head main body 1 faces the upper surface of the disk D, and in FIG.
, And the outer peripheral side is indicated by O. The head main body 1 shown in FIGS. 1 and 2 has flat rail surfaces 2a and 2b parallel to the disk facing surface of the slider 2. The core 3 is joined to the center of the end surface on the trailing side (b) of the slider 2, and a magnetic gap G serving as a magnetic recording and reproducing function unit is formed at the joint between the core 3 and the bottom surface of the slider 2. . A coil 6 is wound around the core 3.

A support member 10 for supporting the head main body 1 includes a flexure 11 and a load beam 12. The flexure 11 is formed by a thin leaf spring, and the main body 11b is fixed to the lower surface 12a of the load beam 12 by means such as welding. At the center of the flexure 11, a notch groove 11e is formed.
e separates the tongue piece 11a. This tongue piece 11a
Is connected to the main body 11b by the connecting portions 11c, 11c. The upper surface of the slider 2 is adhesively fixed to the lower surface of the tongue piece 11a. Further, a spherical pivot 11d is integrally formed at the center of the tongue piece 11a so as to protrude therefrom. 1 can freely move around the vertex of the pivot 11d as a fulcrum.

As shown in FIG. 1, the rail surface 2 passes through the center line of the head body 1, ie, the center of the magnetic gap G.
A center line O1 parallel to a and 2b is attached with a skew angle α to a center line O4 of the support member 10.
That is, the head body 1 is given a skew angle α in a direction in which the end on the trailing side (b) faces the inner circumference side (I side) of the disk. The center of the head main body 1 is located on the outer peripheral side of the disc (O
Side). Therefore, the vertex of the pivot 11d located on the center line O4 of the support member 10 is shifted from the center line O1 of the head main body 1 toward the disk inner peripheral side (I side) by the offset amount Δ. In the embodiment of FIG. 1, the center of the trailing end face of the head main body 1, that is, the magnetic gap G substantially coincides with the center line O4 of the support member 10 due to the offset amount Δ. The load beam 12 is a metal plate, and the head main body 1 is pressed against the disk D with a light force by a plate spring portion provided at the base thereof. When the disk D rotates in the direction A, the head body 1 floats in a posture in which the leading side (a) is lifted higher than the trailing side (b) due to the airflow on the surface.

FIG. 3 shows the moving position of the head main body 1 on the disk D. A pivot arm is further attached to the base of the support member 10, and the center line O4 of the support member 10 pivots about the axis of the pivot arm in the θ direction,
Accordingly, the head main body 1 moves from the inner peripheral side to the outer peripheral side of the disk D. In this embodiment, the magnetic gap G is substantially located on the center line O4 of the support member 10 due to the skew angle α of the head body 1 and the offset amount Δ of the pivot 11d with respect to the center line O1 of the head body 1. Therefore, the magnetic gap G is always on the center line O1 while the head main body 1 moves from the inner circumference to the outer circumference of the disk D.
Therefore, the movement position of the magnetic gap G on the disk D can be easily determined from the rotation angle θ of the support member 10, and the movement position control of the head main body 1 becomes very simple. In addition, since the position of the magnetic gap G can be accurately determined from the rotation angle θ, track access to the high-density recording disk D can be performed accurately in the shortest time. In addition, since the center line O1 of the head body 1 has a skew angle α in the counterclockwise direction in FIG. 3 with respect to the center line O4 of the support member 10, the head body 1 moving from the inner peripheral side to the outer peripheral side. The fluctuation of the flying height can be suppressed.

FIG. 4 shows the relationship between the skew angle α and the flying height (nm) of the magnetic gap G from the surface of the disk D. The horizontal axis indicates the distance in the radial direction of the disk D. The left side in the figure is the inner peripheral side, and the right side in the figure is the outer peripheral side. It is made of Mn-Zn ferrite and has a planar shape of 2.9 × 2.2.
2 shows a case where a slider 2 having a thickness of 0.6 mm and a thickness of 0.6 mm is used. If the skew angle α is 0 degree, the flying height of the head main body 1 that has moved to the outer peripheral side decreases, and the fluctuation of the flying height while moving from the inner periphery to the outer periphery increases. As shown in FIG. 4, it is understood that the variation in the flying height of the magnetic gap G is reduced by giving the skew angle α of about 2 degrees or more and about 6 degrees or less. That is, in the above-described embodiment, the variation of the flying height of the head body can be suppressed by giving the skew angle α, and the magnetic gap G and the center line O4 by the skew angle α can be given by giving the offset amount Δ.
(See FIG. 7) can be made small, or this positional shift δ can be made zero. Further, the head body 1 is provided with a skew angle α, and the pivot 11d is further moved with respect to the center line O1 of the head body 1 on the inner circumferential side (I
By shifting the position by Δ to the side (side), it is possible to suppress the inclination (roll inclination) of the head body 1 in the disk radial direction (X).

FIG. 5 shows the measurement results.
The slider 2 of the head body 1 used is made of Mn-Zn ferrite, has a planar shape of 2.9 × 2.2 mm, and has a thickness of 0.6 mm. The rail surfaces 2a and 2b have the same area. A skew angle (α = 3 degrees) with respect to the center line of the support member 10 was given to the head body 1 using the slider 2. With the same skew angle of 3 degrees, ones with different offset amounts Δ were prepared, and the change in roll inclination was measured for each. In FIG. 5, the horizontal axis indicates the disk D.
The right side in the drawing is the outer peripheral side, and the left side is the inner peripheral side. The vertical axis indicates the roll size. As shown in FIG. 6, the roll size is minus when the inner edge of the slider 2 is higher than the outer edge, and the height between the edges is the roll size (nm). )
And The offset amount Δ is the distance between the center line O1 of the head main body 1 and the vertex of the pivot 11d, and is positive when the vertex of the pivot 11d is closer to the disk inner circumference than the center line O1.

According to the measurement results shown in FIG. 5, when the skew angle α is set to 3 degrees and the offset amount Δ is zero, the head body 1 moved to the outer circumference is in a minus state in which the edge on the inner circumference side of the disk is lifted. Roll posture. When the offset amount Δ is set to (−50 μm), the roll posture becomes more remarkable. On the other hand, when the offset amount Δ is set to the plus side and the amount is increased, it is understood that the lifting of the edge on the inner peripheral side of the disk is suppressed and the roll posture is corrected.
From FIG. 5, when the skew angle α is 3 degrees, the offset amount Δ
It can be understood that when the value is not less than +50 μm and not more than +100 μm, the change in the roll posture is small and the posture of the head main body is stabilized.

By correcting the roll attitude, it is possible to prevent the edge of the slider 2 on the inner peripheral side of the disk or the outer peripheral edge of the disk 2 from approaching extremely close to the disk surface. Thus, when the magnetic head device is used, it is possible to prevent a problem that the edge of the slider 2 comes into contact with the disk surface. In the case where a magnetic gap is formed at a position closer to the rail surface 2a or 2b on the trailing side end surface of the slider 2, the above-described roll posture is corrected, so that the gap between the magnetic gap and the disk surface is reduced. Fluctuation of the flying distance due to the roll can be prevented. In the above embodiment, the case where the head main body 1 in which the magnetic gap G is formed by joining the core 3 to the slider 2 is used has been described, but the center of the trailing side end surface of the slider 2 or the rail surface 2a side is used. Or 2b
The same effect can be obtained even when the thin film element is provided with a reproducing function unit or a recording function unit, and a reproducing function unit and a recording function unit.

[0019]

According to the first aspect of the present invention, the magnetic recording or reproducing function unit and the support member are shifted by shifting the mounting center position of the head main body installed at a skew angle with respect to the center line of the support member. Can be minimized. Further, as described in claim 2, it is possible to make the functional portion substantially coincide with the center line of the support member. This makes it possible to easily and accurately control the movement position of the functional unit on the recording medium.

Further, the roll posture of the head main body can be corrected at the same time, so that contact between the head main body and the recording medium due to the roll posture can be prevented, and the functional section is provided at a position deviated in the width direction of the head main body. In this case, it is possible to prevent the floating position of the functional unit from fluctuating due to the roll posture.

[Brief description of the drawings]

FIG. 1 is a plan view showing a floating magnetic head device according to an embodiment of the present invention;

2 is a side view of FIG. 1,

FIG. 3 is a plan view showing a state in which a head body moves on a disk;

FIG. 4 is a diagram showing a relationship between a skew angle and a flying height;

FIG. 5 is a diagram showing a relationship between an offset amount Δ and a roll posture size;

FIG. 6 is an explanatory diagram illustrating a roll posture.

FIG. 7 is a plan view showing a state in which a head body of a conventional floating head device moves on a disk;

[Explanation of symbols]

 Reference Signs List 1 head body 2 slider 2a, 2b rail surface 3 core 6 coil 10 support member 11 flexure 11d pivot 12 load beam G magnetic gap O1 center line of head body O4 center line of support member α skew angle Δ offset amount

Claims (2)

(57) [Claims] A head body supported by a support member opposes a rotating recording medium in a floating posture, and the head body moves between an inner peripheral side and an outer peripheral side of the recording medium by a rotating operation of the support member. In the floating type magnetic head device, the center line of the head main body is inclined with respect to the center line of the support member so that the trailing side end portion approaches the inner peripheral side, and the center portion of the head main body is supported. A floating magnetic head device, wherein the magnetic head device is mounted so as to be offset from the center line of the member to the outer peripheral side. 2. A magnetic recording or reproducing function unit is provided at a center position of a trailing side end of a head main body, and the function unit substantially coincides with a center line of a support member.
The floating magnetic head device as described in the above.