JP3275484B2 - Floating magnetic head and slider levitation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flying magnetic head for flying over a magnetic disk for recording and reproducing information and a flying method of a slider.

[0002]

2. Description of the Related Art In a magnetic recording / reproducing apparatus, as a magnetic disk rotates, a lift of an air flow acts on a floating rail of a slider provided on a magnetic head to cause the magnetic head to float at minute intervals, thereby causing a magnetic core of the magnetic head to move. The part reads and writes information from and to the magnetic disk. Recently, the magnetic disk has been downsized and the recording density has been increased, and accordingly, the flying height of the magnetic head has been reduced to 0.1 μm.
m and stabilization of the floating of the magnetic head is required. The slider is provided with two floating rails in the traveling direction of the magnetic head relative to the magnetic disk. However, the peripheral speed is different between the inner peripheral side and the outer peripheral side of the magnetic disk. The outer side has a larger flying height, and the magnetic head is inclined and faces the magnetic disk. When the magnetic head is tilted in this manner, there has been a problem that the surface of the magnetic disk is damaged or the recording / reproducing characteristics of the magnetic head deteriorate.

For this reason, conventionally, in order to solve the above-mentioned problem, there has been known a proposal in which a magnetic head floats while keeping parallel to a magnetic disk without tilting. For example, in JP-A-61-137288, of two rails provided on the slider bottom surface, the width of the outer rail is made smaller than that of the inner rail so that the flying height on both rails is uniform. I have to. Also, Japanese Unexamined Patent Publication No.
In JP-A-104461, the flying height of the two flying rails is made uniform by providing steps of 3 to 150 μm on both sides of the flying rail of the slider or changing the width of the two flying rails. Further, Japanese Unexamined Patent Publication No.
In Japanese Patent Application Publication No. 2012280, when the slider is fixed to the support-side pressure plate, the slider is slightly deviated in the width direction with respect to the hemispherical support point provided on the pressure plate, and the outer peripheral side of the slider approaches the magnetic disk surface. To the pressure plate. When the magnetic disk rotates, the moment on the outer peripheral side where the peripheral speed is large is increased, so that the two flying heights are made uniform.

[0004]

In order to prevent the flying magnetic head from being damaged by contact with the magnetic disk or to improve the recording / reproducing characteristics as in the prior art, two sliders are provided on the slider. It has been practiced to make the flying height of the flying rail uniform. However, if the difference in peripheral speed at the radial position is increased due to the high-speed rotation of the magnetic disk as in recent years, the difference in surface pressure acting on the two floating rails on the inner and outer circumferences is also increased, and a difference is easily generated in the flying height. In particular, in a magnetic head in which the flying height is reduced in order to improve the recording / reproducing characteristics, there is a problem that the flying height of the flying rail on the inner peripheral side becomes too small and the magnetic disk is damaged. Therefore, the present invention provides a recording / reproducing characteristic by allowing a magnetic head not to damage a magnetic disk even when the magnetic disk is rotated at a high speed, and by minimizing a flying height of a magnetic core portion of the magnetic head with respect to the magnetic disk. The purpose is to be able to improve.

[0005]

According to the present invention, there is provided a magnetic head in which two floating rails provided at the bottom of a slider face a magnetic disk so that the slider floats by rotation of the magnetic disk. did. That is, a magnetic core is provided on the outer floating rail in the radial direction of the magnetic disk among the two floating rails, the floating height of the outer floating rail is made smaller than the floating height of the inner floating rail, and the slider is inclined. Recording and reproduction. The inclination angle of the slider was set to 15 μrad or less to prevent head crash during the seek operation. The slider is 2
A magnetic core is provided on the outer floating rail in the radial direction of the magnetic disk among the two floating rails, and the width thereof is formed to be at least 10 μm narrower than the width of the inner floating rail. Is smaller than the flying height of the floating rail. If the difference between the widths of the inner and outer flying rails is 0.04 mm or more, the difference in the flying height is too large, so it is desirable to make the difference smaller. In the above floating magnetic head, the shape of the slider is length,
The width and height are 3 mm or less, 2.5 mm or less, respectively.
When the thickness is 0.7 mm or less, the effect is particularly large.

[0006]

In the flying magnetic head of the present invention, of the two flying rails provided on the slider, the flying height of the outer flying rail in the radial direction of the magnetic disk is made smaller than the flying height of the inner flying rail. Therefore, if a small distance is secured between the floating rail on the outer peripheral side where the magnetic core is provided and the magnetic disk, the magnetic disk will not be damaged,
Recording and reproduction characteristics can be improved.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.
The flying type magnetic head 1 has two flying rails 4 a on a surface of a composite type slider 2 facing a magnetic disk 3.
4 b, and a surface opposite to the surface of the magnetic head 1 facing the magnetic disk 3 is attached to the arm 6 via the support plate 5. A pivot 5 a is provided on the support plate 5, and the slider 2 is supported at an appropriate angle with respect to the magnetic disk 3 with the pivot 5 a as a fulcrum. The two flying rails 4a and 4b are arranged substantially in parallel to the tangential direction of the rotating circle of the magnetic disk 3, and the magnetic core 7 is provided at the end of the outer flying rail 4a on the traveling direction side. Information can be written and read.

[0008] Of the two floating rails provided on the slider 2, a floating rail 4a radially outside the magnetic disk 3 is provided.
Is formed to be at least 10 μm narrower than the width of the inner floating rail 4b, and the air flow between the magnetic disk 3
A smaller lift than the inner levitation rail 4b acts. That is, while the magnetic disk 3 is rotating and the floating magnetic head is performing a read / write operation, the outer floating rail 4a is higher than the inner floating rail 4b.
, So that the inner floating rail 4 b is hardly in contact with the magnetic disk 3. It is desirable that the tilt angle of the magnetic head 1 is set to 15 μrad or less so that the recording / reproducing characteristics of the magnetic head do not deteriorate.

Next, the flying height of each flying rail was measured while changing the width of the two flying rails 4a and 4b and changing the radial position with respect to the magnetic disk 3.
The result is as shown in FIG. The size of the slider 2 used was 2.8 in length, width and height.
5 mm, 2.24 mm, and 0.67 mm. From FIG. 3, when the width of the outer flying rail 4a is equal to the width of the inner flying rail 4b, as the radial position facing the magnetic disk 3 increases, the outer flying rail 4a has a larger flying height. Has become. However, the width of the outer floating rail 4a is 0.01 mm larger than the width of the inner floating rail 4b,
When it becomes narrow like 0.02mm, 0.03mm,
The outer floating rail 4a has a lower floating height than the inner floating rail 4b, and the greater the difference in width, the greater the difference in floating amount on the inner peripheral side. However, if the width of the outer levitation rail is 0.04 mm narrower than the inner levitation rail,
The floating amount of the inner floating rail becomes too large, and the inclination of the slider becomes large, which is not desirable.

As described above, the outer flying rail 4a on which the magnetic core 7 is provided can be set at a minute interval with respect to the magnetic disk 3, so that the inner floating rail 4b may come into contact with the magnetic disk 3. Absent. In the above,
In the case where there are two floating rails, when there are three or more floating rails, the above-described difference may be provided in the width of the outermost rail on both sides. Further, in order to incline the flying height of the outer flying rail with respect to the magnetic disk surface so as to be smaller than that of the inner flying rail, it is also possible to tilt and hold the slider on the support plate. In the above embodiment, the composite type slider is used. However, the same effect can be obtained by using a thin film head having a magnetic core formed by forming an electromagnetic transducer by a thin film process.

[0011]

According to the present invention, the floating height of the outer floating rail is made smaller than the floating height of the inner floating rail by making the width of the outer floating rail narrower than the width of the inner floating rail. Therefore, only by setting the interval between the outer floating rail on which the magnetic core is provided and the magnetic disk to a predetermined minute interval, the inner floating rail does not come into contact with the magnetic disk, and the magnetic disk is damaged. I don't have to worry. Also, by setting the flying height of the outer flying rail with respect to the magnetic disk to be minute, the recording / reproducing characteristics can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state in which a magnetic disk of the present invention is mounted on a support plate.

FIG. 2 is a side view of FIG.

FIG. 3 is a relationship diagram showing a flying height of two flying rails at a radial position of a magnetic disk.

[Explanation of symbols]

 Reference Signs List 1 magnetic head 2 slider 3 magnetic disk 4a flying rail 4b flying rail

────────────────────────────────────────────────── (5) References JP-A-61-137288 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 21/21 101 G11B 5/60

Claims (4)

(57) [Claims] In a magnetic head in which two floating rails provided at the bottom of a slider face a magnetic disk and the slider floats by rotation of the magnetic disk, a radius of the magnetic disk among the two floating rails of the slider is provided. A magnetic core is provided on the outer floating rail in the direction, and the floating height of the outer floating rail is smaller than the floating height of the inner floating rail, and the inclination angle is 15 μrad or less. Type magnetic head. 2. The floating magnetic head according to claim 1, wherein the width of the outer floating rail is formed to be narrower by at least 10 μm than the width of the inner floating rail. 3. The slider according to claim 1, wherein the slider has a length, a width and a height of 3 mm or less, 2.5 mm or less, and 0.7 mm or less, respectively.
Floating magnetic head. 4. A slider floating method for a magnetic head in which two floating rails provided on the bottom of a slider face a magnetic disk and the slider floats by rotation of the magnetic disk. In addition to providing a magnetic core on the outer flying rail in the radial direction, making the flying height of the outer flying rail smaller than the flying height of the inner flying rail, and performing recording and reproduction with the slider inclined. How to lift the slider.