JPH05189906A - Production of floating type magnetic head - Google Patents

Abstract

PURPOSE:To set the floating amt. of a slider at a small and exact amt. by coupling a slider and a suspension, then applying heat energy to the spring part of the suspension and adjusting the spring pressure. CONSTITUTION:The slider 1 is coupled to the suspension 2 and is mounted to a mount 25, by which a magnetic head structural body HGA26 is constituted. The deviation between the center of the slider and a load point is measured and recorded by a measuring and recording means 42. The slider 1 is lifted to a prescribed height Z and the pressing force of the suspension 2 is measured. The HGA 26 is fixed to a prescribed measuring arm by a mount 25 and the roll is measured. The measured value of a measuring means 43 is inputted together with the measured value of the measuring and recording means 41, 42 to a microcomputer 44 which in turn computes the spring pressure to obtain the prescribed floating amt. and the bend in a roll direction. Then, the distance of ABS face of the mount 25 and the slider 1 is set at 2 and while the load of the slider 1 is measured by a measuring means 45, the base part of the spring 3 is irradiated with a laser beam L and the prescribed bending amt. in the rolling direction is set by the discrete spring pressure regulation of the required spring and the spring 3. The slider is then mounted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a floating magnetic head in a hard disk drive (hereinafter referred to as HDD), for example.

[0002]

2. Description of the Related Art In an HDD or the like, a magnetic head is arranged on a slider which is adapted to fly from a recording medium, for example, a hard disk (hereinafter referred to as HD), and the magnetic head is required to have a narrow gap with respect to the HD during recording and reproducing operations. It is designed to hold and face each other.

In this case, the slider is made to float by the air flow caused by the relative movement with the recording medium.

As shown in FIG. 1, a slider 1 is provided at a free end of a suspension 2 which applies an elastic pressing force against the above-mentioned floating force, that is, a spring pressure, and a required flying amount is set. There is.

On the other hand, in the HDD, as the recording density is increased, the space between the magnetic head and the medium is required to be narrowed, and thus the flying height of the slider is required to be reduced. The flying height is expected to be reduced to the submicron order, for example, 0.1 μm or less. With the reduction in the flying height, it is necessary to reduce the variation in the flying height, that is, the tolerance.

The factors that cause the flying height of the magnetic head, that is, the slider, to fluctuate are: the rail width of the rail 5 provided on the air bearing surface (ABS) 4 of the slider 1; Curvature in the direction, so-called crown, twist, that is, twist, and the like, suspension load, suspension twist (roll), deviation between the load point of the suspension on the slider and the slider center, and the like can be mentioned.

Therefore, in order to reduce the tolerance of the flying height, it is necessary to make all of these factors close to the design values. However, there is no variation in all of these factors, it is extremely difficult to suppress the tolerances of each dimension, spring pressure, etc., and the change in spring pressure is not small due to handling during the assembly process. What happens is an unavoidable problem.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a suspension type magnetic head in which a suspension is coupled to a slider to which a magnetic head is mounted so that a required flying height can be set, has a narrow air bearing surface. There is provided a method of manufacturing a flying magnetic head, which enables the setting of the above with a small tolerance.

[0009]

In the present invention, as shown in FIG.
And a slider 1 on which a magnetic head 11 is arranged, as shown in a perspective view of an example of the assembled floating magnetic head.
After coupling this with the suspension 2 having at least a pair of spring portions 3 elastically supporting it, thermal energy is individually applied to the pair of spring portions 3 to adjust the spring pressure of each spring portion. The slider 1 is designed to obtain a required flying height from the surface of the recording medium.

[0010]

According to the present invention, after the slider 1 is connected to the suspension 2, thermal energy is applied to the spring portions 3 of the suspension 2 so that a required spring pressure is generated in each of the spring portions 3. By adjusting the spring pressures of both spring parts in this way, the inclination of the suspension 2, that is, the rolling adjustment is performed by the balance of the spring pressures of both spring parts, and the spring pressure of both spring parts 3 is applied to the entire recording medium. The pressing force can be adjusted.

That is, generally, the spring pressure is such that the spring material is bent so that the spring pressure is generated, and then heat treatment is performed to release the mechanical strain generated by this bending and adjust the spring pressure, specifically, , Adjust by reducing the spring pressure.

The relationship between this spring pressure and heating will be described with reference to FIG. In this case, the abscissa indicates the passage of time and the ordinate indicates the spring pressure. Now, for example, when the spring material such as a leaf spring is bent and heat energy is not applied, that is, the spring pressure in the initial state is T _When it is ₀ , when the thermal energy is applied to the spring portion 3, the spring pressure decreases in the application time of the thermal energy, that is, in the heating section τ ₁ , but τ ₁
After that, that is, with the heating stopped, the spring pressure returns to a certain value. That is, in this case, the spring pressure becomes a value T ₁ lower than the initial spring pressure T ₀ . Further, if heating is performed from this state over the section τ ₂ , the spring pressure is reduced and the heating is stopped, so that the spring pressure T ₂ is lower than the spring pressure T ₁ . Therefore, the spring pressure can be set to a desired value lower than the initial spring pressure T ₀ by selecting the heating time or the heating frequency. Therefore, as described above, when the suspension and the slider are combined, that is, when the assembly of the support portion of the magnetic head is completed, the spring pressure of the suspension can be measured and set so that the required spring pressure is obtained. By so doing, the required load can be obtained by including all of the above-described slider dimensions, suspension load, torsion of the suspension, etc., and tolerances such as deviation of the load between the slider center and the suspension. Even when the flying height can be set and the flying height is narrow, the flying height can be set with a small tolerance.

[0013]

EXAMPLE An example of the manufacturing method according to the present invention will be described.

In the present invention, as shown in the enlarged schematic perspective view of FIG. 1, a slider made of alumina, potassium titanate, AlTiC (hot press or sintered body by mixing Al ₂ O ₃ and TiC), etc. 1 is prepared. This slider 1 is provided with, for example, two rails 5 that are parallel to each other on a surface facing the recording medium, that is, for example, HD, that is, an air bearing surface, so-called ABS 4. For example, a side surface of one rail 5 has a magnetic gap on the ABS surface 4. The magnetic head 11 such as an inductive type thin film magnetic head or / and a magnetoresistive effect type thin film reproducing magnetic head is mounted so as to face the above.

The slider 1 is configured so that a pressing force is applied to a magnetic recording medium S, for example, HD by a suspension 2.

The suspension 2 has a so-called load beam composed of a gimbal portion 12 and a leaf spring 13, and a notch 14 is formed in the load beam 13 at the base side of the leaf spring, that is, a leaf spring. One by one,
That is, at least a pair of spring portions 3 is formed. Each of the spring portions 3 has a "" shape along the longitudinal direction of the load beam.
It is bent in a V shape and fixed to the mount portion 25.

The gimbal portion 12, as shown in a schematic perspective view of FIG. 3, is formed of a band-shaped elastic metal plate, for example, and a bending groove is provided in the central portion thereof.
As shown in FIG. 5, the slider 1 is fitted in a groove 15 provided on the opposite side of the ABS 4. Gimbal part 1
An elastic tongue piece 14 is formed in the central portion of 2 by cutting, and a projection 16 bulging upward is provided on this.
On the other hand, the free end of the leaf spring (load beam) 13 is coupled to the rear end of the gimbal portion 12 by welding or the like, and the free end 17 of the free end abuts the projection 16 of the gimbal portion 12. It In this way, the slider 1 having the magnetic head 11 is attached to the mount portion 25 via the suspension 2 so as to form a magnetic head structure, so-called HG.
The A (head gimbal assembly) 26 mounts the magnetic head on the mounting portion 25 as a magnetic recording medium S,
For example, it is fixed to a drive arm (not shown) brought to a predetermined position on the HD.

In this way, the recording medium S, for example HD
The suspension 2 applies a pressing force against the levitation force of the slider 1 due to the air flow caused by the relative shift between the slider 1 and the HD by the rotation of the suspension 2, so that the slider 1 maintains a required levitation amount with respect to the surface of the medium S. Done

In the present invention, the gimbal portion 12 is attached after the suspension 2 and the slider 1 are coupled to each other, that is, at the tip of the suspension 2, and the slider 1 is engaged with the gimbal portion 12 in the present invention. In this state, the pair of spring portions 3 are individually irradiated with the laser light L or the like locally for a required number of times over a required number of times to provide heat energy to perform the respective heating and spring pressure adjustments described in FIG. ..

A specific process of adjusting the spring pressure will be described with reference to FIG.

First, the measuring / recording means 41 measures the width W _L of the rail 5 of the slider 1, the shape of the rail, that is, the so-called crown in the longitudinal direction of the rail, the inclination of the left and right rails, the so-called twist, etc., and the measured data. To record.

As described with reference to FIG. 1, this slider 1 is
A magnetic head structure, so-called HGA 26, which is connected to the suspension 2 and attached to the mount portion 25, is configured. Then, with respect to this HGA 26, the deviation between the slider center and the load point is measured by the measuring / recording means 42, and the data is recorded.

On the other hand, for the HGA 26, the slider 1 is
The suspension 2 is lifted to a predetermined height (Z) against the pressing force of the suspension 2 and set, and the pressing force of the suspension 2 at this time, that is, the spring pressure is measured. Mount the HGA26 on the mount 2
The roll shown by arrow a of the slider 1, that is, the inclination is measured by a collimator or the like, and the measured data by the measuring means 43 is recorded together with the measured and recorded data by the measuring / recording means 41 and 42. , A computer, for example a microcomputer 44,
The spring pressure and the bending in the roll direction at which the magnetic head, that is, the slider 1 obtains a predetermined flying height with respect to a predetermined surface are calculated.

Next, the mount portion for the HGA 26
25 mount position and ABS4 of slider 1
The set distance is set to the above-mentioned height Z.
While measuring the load of the slider 1 by the load measuring means 45,
The leaf spring of the suspension 2, that is, the load beam 13
The pair of spring portions 3 on both sides of the base are irradiated with the laser beam L, respectively.
Shoot. These laser beams L have a beam diameter of 1 m.
m laser beams at the same time or in time division
Required time τ explained in FIG. 2 for the spring portion 3 ₁, Τ₂
Heat energy required for irradiation for the required number of times with
Is selected and the spring pressure is selected to be lower than the initial spring pressure.
The spring for the slider 1 is calculated by the sum of the spring pressures of the spring portions 3.
Adjusting the mutual spring pressure of both spring parts 3 while setting the pressure
The bending in the roll direction is set to a predetermined amount by.

The HGA 26 for which the pressing force of the suspension 2 has been adjusted in this manner is attached to, for example, the HDD head arm via the mount portion 25 thereof.

In this way, when the HGA 26 is assembled, the suspension 2 can exert a predetermined pressing force against the slider 1, that is, a predetermined pressing force against the floating force due to the air flow caused by the rotation of the HD, and the flying height can be set accurately. Can be done.

In this way, the rail shape of the slider 1 can be finally set, or a predetermined load including all errors such as the deviation of the slider load point can be set, and thus the thus obtained load can be obtained. The flying type magnetic head can accurately obtain a flying height with a very small tolerance with respect to the recording medium S such as HD.

In the above-mentioned example, the load beam 13 is composed of a leaf spring, and a pair of spring portions 3 are provided on the base side of the fixed portion so that a required spring pressure can be obtained. However, various configurations can be adopted without being limited to the above-described structure such as providing one or more pairs of spring portions 3.

[0029]

As described above, in the present invention, since the magnetic head structure, that is, the HGA 26 can be configured and the spring pressure can be adjusted later, the characteristics of the slider 1 and the load point of the HGA 26 on the slider 1 can be adjusted. In the case where the spring pressure can be adjusted to include all the deviations and the like, and the load can be set on the slider 1 having a small tolerance, and thus the flying height can be reduced for the recording medium S, for example, HD by increasing the recording density. In the case of, the tolerance can be made sufficiently small.

[Brief description of drawings]

FIG. 1 is an enlarged perspective view of an example of a magnetic head obtained by a manufacturing method of the present invention.

FIG. 2 is a diagram for explaining a spring pressure adjustment.

FIG. 3 is a perspective view of an example of a gimbal portion.

FIG. 4 is a flow chart for explaining the operation of the manufacturing method of the present invention.

[Explanation of symbols]

 1 Slider 2 Suspension 3 Spring Part 11 Magnetic Head 12 Gimbal Part 13 Leaf Spring (Load Beam)

Claims (1)

[Claims] 1. A slider in which a magnetic head is disposed and a suspension having at least a pair of spring portions elastically supporting the slider are coupled to each other, and then thermal energy is individually applied to the pair of spring portions. A method for manufacturing a flying type magnetic head, characterized in that the spring pressure of each of these spring portions is adjusted so that the slider can obtain a required flying height from a recording medium.