JPH06203507A - Floating magnetic head and its supporting spring - Google Patents

Abstract

PURPOSE:To provide the floating magnetic head and supporting spring thereof which eliminates a fear of flawing a fixed disk even when contact-start-stop operation is performed over a long period of time and also a fear of flawing a gap part of a magnetic head slider. CONSTITUTION:The magnetic head slider 1 consisting of a nonmagnetic substance is provided with a core chip 2, and moreover, middle parts of both side surfaces of the magnetic head slider are provided with supporting spring fixing grooves 3 parallel in the longitudinal direction of the magnetic slider 1 respectively. The supporting spring fixing groove 3 is formed slightly wider in its groove width than the thickness of the supporting spring, and for instance, the groove width of the supporting spring fixing groove 3 is formed to be approximately 70-100mum because the thickness of the supporting spring is approximately 50mum in the general case.

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 characterized by the construction of a head gimbal assembly of a floating magnetic head used in a fixed magnetic disk device used for recording / reproducing data in a computer or the like. And a support spring for a floating magnetic head.

[0002]

2. Description of the Related Art In a conventional floating magnetic head used in a fixed magnetic head device, a core chip 2 is embedded in a magnetic head slider 11 and fixed to a mold glass as shown in FIG. A floating surface for obtaining lift by the air flow 12 generated by rotation,
A coil wire 9 is wound around the core chip 2 to form a floating magnetic head.

The magnetic gap portion 1 of this floating magnetic head
3 is that the closer to the fixed disk 8, the higher the recording density and the larger output can be obtained. Therefore, normally, the minimum gap position of the slider surface facing the magnetic head slider 11 of the floating magnetic head is the rotation of the fixed disk 8. In addition to speed, it is determined by the shape of the slider surface and the load. Further, the support spring 4 is directly adhered to the outer surface of the slider 11 with the curable epoxy resin 10 having an excellent fixing force interposed.

[0004]

On the other hand, recently, the fixed magnetic disk device has become smaller and thinner, and accordingly, the floating magnetic head also has a remarkable tendency to be smaller and thinner. Here, the magnetic head slider 11 and the support spring 4 are usually adhered and fixed via a resin such as a thermosetting epoxy resin 10, but the support spring 4 is usually used.
The longitudinal center line of the magnetic head slider is represented by a type (in-line type) mounted in parallel with the longitudinal center line of the magnetic head slider (a virtual center line connecting the head air flow outlet ends). Since the support spring 4 is located on the core chip portion 2 on the winding side of the magnetic head slider 11 as well, in the HGA (head gimbal assembly), the contraction of the resin causes the resin to shrink.
As shown in FIG. 3, there is a problem that a bending moment 14 is generated in the fixed portion and the portion of the support spring 4 where the magnetic head slider is attached deforms.

Therefore, the deformation of the magnetic head slider mounting portion eventually pushes the core chip 2 of the magnetic head slider 11 with a load, and the core chip 2 projects from the air bearing surface to a convex shape (a ridge of about 100 mm). There was a problem that it would be done.

Further, when the magnetic head slider 11 is used for a long time (contact start stop) in such a state, the core chip 2 scratches the fixed disk 8, destroys the recorded information, and the core chip 2 floats. There was a problem that the magnetic gap portion 13 of the magnetic head slider 11 located on the surface side was damaged and the electromagnetic conversion characteristics were deteriorated.

In addition, as the size of the floating magnetic head is reduced, the mounting area of the support spring 4 and the magnetic head slider 11 is reduced, and the adhesive force between the magnetic head slider 11 and the support spring 4 is naturally reduced. , The problem that the support spring 4 is disengaged from the magnetic head slider 11 is assumed,
There was a risk of causing the magnetic disk drive to become inoperable.

The present invention solves the problem caused by the improper mounting state of the support spring of the magnetic head slider in such a floating magnetic head, and the fixed disk is scratched even after contact start / stop for a long time. It is an object of the present invention to provide a floating magnetic head and a support spring for the floating magnetic head, which does not cause the risk of damage to the magnetic head slider or damage to the gap of the magnetic head slider.

[0009]

In order to achieve the above object, the invention of claim 1 is a floating magnetic head applied to a fixed magnetic disk or the like, and a head gimbal assembly is provided on both side surfaces of a magnetic head slider. In the floating magnetic head, the support spring mounting groove is provided so as to be opened in parallel with the longitudinal direction of the magnetic head slider.

According to a second aspect of the present invention, there is provided a support spring for a head gimbal assembly which is inserted into the support spring mounting groove of the magnetic head slider, wherein the slider mounting portion covers the support spring mounting groove. The support spring for a floating magnetic head is characterized in that it is formed as described above and has a degree of freedom that is satisfactory for the floating posture of the floating magnetic head.

[0011]

According to the first aspect of the present invention, since the support springs are inserted and fixed in the support spring fixing grooves on both side surfaces of the magnetic head slider by the above structure, deformation of the support springs is prevented by the fixing grooves. The mounting position of the head slider becomes constant, and the magnetic head slider does not come off from the support spring. Further, in the invention of claim 2, since the support springs are inserted into and fixed to the support spring fixing grooves on both side surfaces of the magnetic head slider, the support springs can be easily mounted and the magnetic head slider is floated. Since it has a degree of freedom to satisfy the posture, the contact start / stop reactivity with respect to the recording surface of the fixed magnetic disk is satisfied.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a floating magnetic head of the present invention. A magnetic head slider 1 made of a non-magnetic material is provided with a core chip 2, and the magnetic head slider is provided with central portions on both sides of the magnetic head slider. Are each provided with a support spring fixing groove 3 parallel to the longitudinal direction of the magnetic head slider 1.

The support spring fixing groove 3 is formed such that its groove width is slightly wider than the thickness of the support spring. For example, in the case of a general support spring, the thickness of the support spring is 50.
Since it is about μm, the groove width of the support spring fixing groove 3 is formed to be about 70 to 100 μm.
The depth of the support spring fixing groove 3 is 200 to 300 μm from the viewpoint of the fixing strength of the support spring.

As the means for forming the support spring fixing groove 3, since it is necessary to narrow the groove width and form it with high accuracy, for example, a metal grindstone using diamond abrasive grains is used with high accuracy and high rotation. It is desirable to adopt the processing machine with the air spindle. By using a highly accurate and high-speed air spindle that uses a metal-based grindstone that uses diamond abrasive grains, it is possible to form the dimensional accuracy of the support spring fixing groove within ± 5 μm. Therefore, it is possible to improve the mounting position accuracy and form a floating magnetic head having high performance reliability.

2 and 3 show a support spring 4 for a floating magnetic head, which is used in combination with the floating magnetic head of the present invention. The support spring fixing groove 3 provided on both side surfaces of the slider 1 is provided with an engagement concave portion 4a that engages so as to cover the support spring fixing groove 3 from the outside (on both side surface sides of the magnetic head slider). A pair of right and left fitting projection pieces 4b to be fitted into the support spring fixing groove 3 are provided on both sides of the engagement recess 4a. Further, the fitting convex piece 4b has
A notch recess 4c and an L-shaped opening hole 4d for providing flexibility are provided respectively.

The notch recess 4c and the L-shaped opening 4d are designed to have an appropriate opening width and length so that the floating posture of the floating magnetic head can be appropriately adjusted. It is provided in advance. The support spring 4 is attached to the load arm 6 at the welding portion 5 on the side opposite to the cutout recess 4c.
It is integrally attached to by welding.

On the other hand, at the other end of the load arm 6,
A mount 7 is provided for joining the magnetic head to a fixed position on the fixed disk and joining it to an actuator (not shown) for performing a recording or reproducing operation. The mount 7 is integrated with the actuator (not shown) by screwing or caulking.

The support spring 4 is engaged with the magnetic head slider 1 by facing the engagement recess 4a as shown in FIG. 3, and the support spring 4 is fitted in the support spring fixing groove 3.
Is fitted and joined from both left and right sides, and is fixedly integrated with the support spring fixing groove 3 via the epoxy resin 10 as shown in FIG.

The floating magnetic head having the above structure is
As shown in FIG. 4, an HGA (head / gimbal assembly) is used and the rotation of the fixed disk 8 generates an air flow 9.
Used by floating about 1 to 0.2 μm.

At this time, according to the floating type magnetic head of the present invention, at the mounting portion of the magnetic head slider 1 and the support spring 4, the support spring fixing groove into which the support spring 4 is fitted on both side surfaces of the magnetic head slider 1. 3 is provided and the support spring 4 is fitted therein, the deformation of the support spring 4 is prevented by the support spring fixing groove 3, so that the core chip 2 is projected from the air bearing surface of the magnetic head slider 1 in a convex shape. There is no need to worry about damaging the fixed disk 8 and destroying the recorded information.

Further, since the support spring 4 can be joined to the magnetic head slider 1 by being fitted into the support spring fixing groove 3 and fixed by a resin such as epoxy resin, the fixing force by the resin and the fitting into the groove. The magnetic head slider 1 is firmly fixed to the support spring 4 by the synergistic effect of
The reliability of the performance is much improved without the risk of the magnetic head slider coming off the support spring.

Further, since the support spring fixing grooves 3 are provided on both side surfaces of the magnetic head slider 1 to determine the joint position between the magnetic head slider 1 and the support spring 4, the fixing position becomes constant and the positional accuracy is improved. As a result, not only the quality of the floating magnetic head becomes stable, but also the joining of the magnetic head slider 1 and the support spring 4 does not require a special positioning jig, and the production can be rationalized.

[0023]

As is apparent from the above description, according to the invention of claim 1, in the floating magnetic head applied to a fixed magnetic disk or the like, the head gimbal assembly is supported on both side surfaces of the magnetic head slider. Since the floating magnetic head is characterized in that the spring mounting groove is provided along the longitudinal direction of the magnetic head slider, there is no fear that the core chip embedded in the magnetic head slider protrudes from the air bearing surface in a convex shape. , There is no risk of damaging the fixed disk even if the tact-start / stop is repeated for a long time, the magnetic gap part located on the air bearing surface side is also not damaged, and the electromagnetic characteristics of the floating magnetic head are deteriorated. There is no such thing.

Further, since the supporting spring fixing grooves are provided on both side surfaces of the magnetic head slider 1 and the supporting springs are inserted into the supporting spring fixing grooves and bonded and fixed, the fixing force of the magnetic head slider is improved. There is no worry that the magnetic head slider will come off the support spring. Further, since the mounting position of the support spring with respect to the magnetic head slider is specified by the position of the supporting spring fixing groove, the precision of the mounting position of the magnetic head can be improved and the quality of the floating magnetic head can be stabilized. Further, by setting the position of the supporting spring fixing groove at a high position on both side surfaces of the magnetic head slider, it is possible to design the entire height of the floating magnetic head including the supporting spring portion to be low. As a result, it is possible to provide a thin-type magnetic head slider with stable performance that meets the demand for thinner fixed magnetic disk devices.

According to a second aspect of the present invention, the floating magnetic
It is inserted into the support spring fixing groove of the head slider.
In the support spring, the attachment part to the slider is
It is formed so as to cover the air head slider mounting groove.
And the freedom to satisfy the floating posture of the floating magnetic head
Floating magnetism characterized by being formed with a certain degree
Since it is a head support spring,
It can be fitted in the grooves on both sides to exert a strong fixing force.
And the magnetic head slider can come off.
And the floating magnetic head maintains its floating posture.
Since it has only the degree of freedom, it is a tact start
・ The responsiveness of the stop is good and the magnetic head slider
To provide a floating magnetic head with excellent adhesion and responsiveness
Is something that can be done.

[Brief description of drawings]

FIG. 1 is a perspective view showing a magnetic head slider of a floating magnetic head of the present invention,

FIG. 2 is a perspective view of a floating type magnetic head support spring of the present invention used in the magnetic head slider shown in FIG.

FIG. 3 is an enlarged perspective view illustrating a method of attaching a magnetic head slider and a support spring of a floating magnetic head of the present invention,

FIG. 4 is a side view illustrating a state in which the magnetic head slider and the support spring of the floating magnetic head of the present invention are attached and used.

FIG. 5 is a side view of a floating magnetic head using a conventional magnetic head slider.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 magnetic head slider 2 core chip 3 support spring fixing groove 4 support spring 4a engaging concave portion 4b fitting convex piece 4c cutout concave portion 4d L-shaped opening hole 5 support spring welding portion 6 load arm 7 mount 8 fixed disk 9 coil 10 Thermosetting Epoxy Resin 11 Magnetic Head Slider (Conventional) 12 Air Flow

Claims (2)

[Claims] 1. A floating magnetic head applied to a fixed magnetic disk or the like, wherein support spring mounting grooves for a head gimbal assembly are provided on both side surfaces of the magnetic head slider along the longitudinal direction of the magnetic head slider. A floating magnetic head characterized in that 2. A support spring inserted into a support spring fixing groove of the floating type magnetic head slider, wherein a mounting portion to the slider is formed so as to cover the magnetic head slider mounting groove and is floating. A support spring for a floating magnetic head, which is formed with a degree of freedom that can satisfy the floating posture of the magnetic head.